CN106143482A - Hybrid vehicle and control method thereof and device - Google Patents

Abstract

The invention discloses a control method of a hybrid electric vehicle, comprising: a control module receives the SOC target point set by the user, and sends the SOC target point set by the user to a motor controller; the motor controller obtains the current SOC of the power battery value; the motor controller selects the corresponding control strategy according to the SOC target point set by the user and the current SOC value; and under the power that meets the driving requirements of the whole vehicle, it controls the charge and discharge of the hybrid vehicle according to the selected control strategy. The method introduces the setting function of the SOC target point to realize the driver's target control of the power battery power of the hybrid electric vehicle. The invention also discloses a control device of the hybrid electric vehicle and the hybrid electric vehicle.

Description

Hybrid electric vehicle and its control method and device

technical field

The invention relates to the technical field of hybrid electric vehicles, in particular to a control method and device for the hybrid electric vehicle and the hybrid electric vehicle.

Background technique

At present, the control method for the power battery of the hybrid electric vehicle is generally to maintain the power of the power battery through the self-identification of the vehicle control system. Specifically, when the power of the power battery is lower than a certain limit, the hybrid vehicle starts the engine to charge the power battery, and controls the vehicle so that it cannot be driven in pure electric mode; when the power of the power battery is higher than a certain limit due to feedback or power generation, it can Controls engine stalls that are started due to power generation, and re-responds to start and stop.

It can be seen that during the above-mentioned whole process, the power of the power battery cannot be maintained through the active intervention of the driver. For example, a certain hybrid vehicle has a first mode and a second mode. When the hybrid vehicle is in the first mode, the hybrid vehicle can try to keep the power in the high-voltage battery unchanged, even if it is consumed during driving. The battery will also be charged through the engine and energy recovery, and this mode only uses a small part of the electric energy; when the hybrid electric vehicle is in the second mode, the hybrid electric vehicle can charge the high-voltage battery as much as possible to provide the next long distance Prepare for pure electric driving.

However, the mode selection of the above-mentioned hybrid vehicles and the level of power battery maintenance are all determined by the vehicle itself. Although it reflects part of the driver's expectations, it does not give the driver a clearer goal.

Contents of the invention

The object of the present invention is to solve one of the above-mentioned technical problems at least to a certain extent.

Therefore, the first object of the present invention is to propose a control method for a hybrid electric vehicle. The method introduces the setting function of the SOC target point to realize the driver's target control of the power battery power of the hybrid electric vehicle.

The second object of the present invention is to provide a control device for a hybrid electric vehicle.

A third object of the present invention is to provide a hybrid vehicle.

In order to achieve the above object, the control method of the hybrid electric vehicle in the embodiment of the first aspect of the present invention includes: the control module receives the SOC target point set by the user, and sends the SOC target point set by the user to the motor controller; The motor controller obtains the current SOC value of the power battery; the motor controller selects a corresponding control strategy according to the SOC target point set by the user and the current SOC value; and controls the hybrid according to the selected control strategy The power vehicle performs charge and discharge control.

According to the control method of the hybrid electric vehicle in the embodiment of the present invention, the SOC target point set by the user is received through the control module, and the SOC target point set by the user is sent to the motor controller, and the motor controller obtains the current SOC value of the power battery , and select the corresponding control strategy according to the SOC target point set by the user and the current SOC value, and control the charge and discharge of the hybrid vehicle according to the selected control strategy, that is, by introducing the setting function of the SOC target point, the driver can realize the The power battery power of the hybrid electric vehicle is controlled by target.

In order to achieve the above object, the control device of the hybrid electric vehicle in the second embodiment of the present invention includes: a control module and a motor controller, wherein the control module is used to receive the SOC target point set by the user, and convert the The SOC target point set by the user is sent to the motor controller; the motor controller is used to obtain the current SOC value of the power battery, and select the corresponding SOC target point according to the user-set SOC value and the current SOC value control strategy, and perform charging and discharging control on the hybrid electric vehicle according to the selected control strategy.

According to the control device of the hybrid electric vehicle in the embodiment of the present invention, the SOC target point set by the user is received through the control module, and the SOC target point set by the user is sent to the motor controller, and the motor controller obtains the current SOC value of the power battery , and select the corresponding control strategy according to the SOC target point set by the user and the current SOC value, and control the charge and discharge of the hybrid vehicle according to the selected control strategy, that is, by introducing the setting function of the SOC target point, the driver can realize the The power battery power of the hybrid electric vehicle is controlled by target.

In order to realize the above-mentioned embodiments, the hybrid electric vehicle of the embodiment of the third aspect of the present invention includes the control device of the hybrid electric vehicle of the embodiment of the second aspect of the present invention.

According to the hybrid electric vehicle of the embodiment of the present invention, the SOC target point set by the user can be received by the control module in the control device, and the SOC target point set by the user can be sent to the motor controller, and the motor controller can obtain the current state of the power battery. SOC value, and select the corresponding control strategy according to the SOC target point set by the user and the current SOC value, and control the charge and discharge of the hybrid vehicle according to the selected control strategy, that is, by introducing the setting function of the SOC target point, the driving can be realized. The operator performs target control on the power battery power of the hybrid vehicle.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein,

Fig. 1 is the flow chart of the control method of hybrid electric vehicle according to one embodiment of the present invention;

2 is a schematic diagram of an SOC target point setting interface provided to a user by a control method for a hybrid electric vehicle according to an embodiment of the present invention;

Fig. 3 (a) is the schematic diagram of the energy trend in the hybrid electric vehicle when the SOC target point is less than the current SOC value;

Figure 3 (b) is a schematic diagram of the energy trend in the hybrid electric vehicle when the SOC target point is greater than the current SOC value;

Fig. 4 is an interactive example diagram of a control method of a hybrid electric vehicle according to an embodiment of the present invention;

Fig. 5 is an example diagram of a control method of a hybrid electric vehicle according to an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a control device for a hybrid electric vehicle according to an embodiment of the present invention.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

A control method and device for a hybrid electric vehicle and a hybrid electric vehicle according to embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a flowchart of a control method for a hybrid electric vehicle according to an embodiment of the present invention. As shown in Figure 1, the control method of the hybrid electric vehicle may include:

S101, the control module receives the SOC (State of charge, the ratio of the charging capacity of the power battery to the rated capacity) target point set by the user, and sends the SOC target point set by the user to the motor controller.

For example, assume that the control method of the hybrid electric vehicle in the embodiment of the present invention provides the SOC target point setting function for the user, as shown in Figure 2, the SOC target point setting provided by the control method of the hybrid electric vehicle of the present invention A schematic diagram of the interface, wherein the SOC target point setting interface can be located in the multimedia screen in the vehicle, and the user can set the SOC target point by manually sliding the slider on the setting interface as shown in Figure 2 . Taking the control module as the control module in the multimedia as an example, when the SOC target point set by the user is detected, the multimedia control module can receive the SOC target point set by the user, and can send the SOC target point set by the user to the motor controller. At the same time, the multimedia control module can also memorize the SOC target point set by the user, so that the set SOC target point will still be defaulted when the power is turned on next time, until the user manually sets and changes the target point. Wherein, in the embodiment of the present invention, the setting range of the SOC target point may be within a preset range with the preset SOC target point as the center point. For example, as shown in FIG. 2 , the SOC target point can be set within a range of 15%-70%, that is, the user can set the SOC target point within the preset range (15%-70%).

S102, the motor controller acquires the current SOC value of the power battery.

Specifically, the motor controller can obtain the current actual SOC value of the power battery sent by the power battery manager in the hybrid electric vehicle in real time, that is, the current SOC value of the power battery.

S103, the motor controller selects a corresponding control strategy according to the SOC target point set by the user and the current SOC value.

Specifically, in the embodiment of the present invention, the motor controller selects the corresponding control strategy according to the SOC target point and the current SOC value set by the user. Active discharge strategy; if the SOC target point is equal to the current SOC value, select the battery power maintenance strategy; if the SOC target point is greater than the current SOC value, select the driving power generation strategy.

More specifically, the motor controller can compare the SOC target point set by the user with the current SOC value, and select a corresponding control strategy according to the comparison result. For example, when the SOC target point is less than the current SOC value and the vehicle is driven by a hybrid system, the motor controller can adopt an active discharge strategy to allow the power motor to participate in output power as much as possible to reduce engine fuel consumption. As shown in Figure 3(a), the motor controller can control the motor M to work with the preset discharge power to output torque. At this time, the power battery 1 drives the energy to the motor M through the inverter 2, that is, the motor M Assist the engine E to drive the drive wheel 3 to run.

For another example, when the SOC target point is equal to the current SOC value, the hybrid vehicle will try to keep the power of the power battery unchanged. Even if some power is consumed during driving, it will recharge the power battery through energy feedback to make the The power of the power battery is kept constant during the running of the hybrid vehicle. At this time, the engine mainly outputs torque to the driving wheels. It can be understood that the battery power maintenance strategy is applicable to the maintenance mode of the vehicle.

For another example, when the SOC target point is greater than the current SOC value, the hybrid electric vehicle can charge the power battery by generating electricity while driving, so that the power can be as close as possible to the SOC target point set by the user. At this time, the energy trend in the hybrid electric vehicle can be As shown in Fig. 3(b), when the engine meets the drive condition, by controlling the engine E to run at high power so that part of the torque of the engine E is output to the motor M, the motor M charges the power battery 1 through work. That is to say, during the driving process of the hybrid power system, under the premise of ensuring the driving power required by the whole vehicle, the engine is controlled to run in the high-efficiency area so that part of the torque of the engine is output to the motor so that the motor can charge the power battery. The engine outputs torque to the drive wheels and the motor respectively. After receiving the output torque, the motor converts the mechanical energy into electrical energy to charge the power battery. It can be understood that this driving power generation strategy is applicable to the economical mode of the vehicle.

S104, under the condition that the power required for driving the whole vehicle is met, the charge and discharge control of the hybrid electric vehicle is performed according to the selected control strategy.

Specifically, in an embodiment of the present invention, when the control strategy selected by the motor controller is an active discharge strategy, the motor controller can first judge the current running state of the motor, and when the motor is currently in a stopped state, control the motor to start, And control the motor to work with the preset rated power to output torque, so that the current SOC value is equal to the SOC target point; when the motor is currently running, judge whether the motor meets the motor drive requirements, if so, directly control with the preset rated power The motor works to output torque so that the current SOC value is equal to the SOC target point. Wherein, in the embodiment of the present invention, the aforementioned preset rated power may be obtained from actual conditions such as engine matching and simulated road condition matching. That is to say, if the power battery is in a relatively high state, in order to reduce fuel consumption as much as possible, the motor controller will allocate More torque is output to the motor to consume the electric energy of the power battery. At this time, the motor and the engine jointly output torque to the driving wheels to help the vehicle drive. It can be understood that this active discharge strategy is applicable to the sports mode of the vehicle.

It should be noted that when the motor controller enters the active discharge strategy, the motor system can first self-check and judge that the motor can participate in the drive, that is, check whether the temperature of each module is normal: the motor controller needs to collect motor temperature, water temperature, IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) temperature, IPM temperature, when the temperature of each module is too high, the motor is not allowed to work; at the same time, it is also necessary to judge whether there is a collision signal: when the vehicle collides severely, in order to ensure personal safety , the drive system must be shut down immediately. When the motor controller judges that the temperature of each module is normal and the vehicle has no collision signal, it can be determined that the motor can participate in driving the whole vehicle.

When the control strategy selected by the motor controller is the battery power maintenance strategy, the motor controller can first judge whether the engine can meet the driving requirements of the whole vehicle alone. If so, control the motor to stop output and the power battery to stop discharging. If not, control The motor participates in the output, and further judges whether the difference between the current SOC value and the SOC target point is within the preset range. If yes, control the motor energy feedback to recover the power. If not, then judge that the SOC target point is greater than the current SOC value. When the hybrid electric vehicle is controlled to enter the corresponding driving power generation strategy, or when the SOC target point is judged to be less than the current SOC value, the hybrid electric vehicle is controlled to enter the corresponding active discharge strategy. That is to say, when the motor controller chooses to enter the battery power maintenance strategy, the motor controller can first judge whether the engine can meet the driving requirements of the whole vehicle alone. Among them, the engine cannot meet the driving requirements of the whole vehicle alone. Gear position, engine speed, and engine external characteristic curve, even if the engine outputs the maximum power, it cannot meet the driving power requirements of the vehicle. Here, driving refers to the motor controller judging the current vehicle speed, accelerator pedal depth, slope and other conditions to determine the current condition of the vehicle. Power required for driving. When it is judged that the engine alone can drive the whole vehicle, the motor does not output and the battery does not discharge; when the engine cannot alone meet the drive of the whole vehicle, control the motor to participate in the output to supplement the shortage of the engine, and then judge the current SOC value and SOC target point If the difference is not within the preset range (such as plus or minus 1%), if it is, then the motor energy will be fed back to recycle the electricity so that the hybrid electric vehicle can maintain the power of the power battery during driving. If not, then Judge the difference between the current SOC value and the SOC target point, and choose to enter the corresponding power generation strategy or active discharge strategy according to the judgment result: that is, if the difference between the current SOC value and the SOC target point is positive, enter the active discharge strategy. Discharging strategy; if the difference between the current SOC value and the SOC target point is negative, it will enter the driving power generation strategy.

When the control strategy selected by the motor controller is the driving power generation strategy, the motor controller can first judge whether the engine alone can meet the driving requirements of the vehicle, if not, control the motor to participate in the output, if so, control the motor to stop output and power the battery Stop discharging, and further judge whether the output torque of the engine is less than the preset value, if so, obtain the difference between the SOC target point and the current SOC value, and then determine the power generation according to the difference, and control the output of the engine according to the power generation To make the motor generate electricity, that is, to charge the power battery. Specifically, in an embodiment of the present invention, the generated power is determined according to the difference, and the output of the engine is controlled according to the generated power so that the motor generates electricity, that is, the specific implementation process of charging the power battery can be: when the difference is greater than or When it is equal to the first threshold, determine that the generated power is the first power value, and control the torque of the engine with the first power value to make the motor generate electricity, so that the current SOC value is equal to the SOC target point; when the difference is less than the first threshold and greater than or equal to When the second threshold is determined, the generated power is determined to be a second power value, and the torque of the engine is controlled with the second power value to generate electricity for the motor, so that the current SOC value is equal to the SOC target point, wherein the first power value is greater than the second power value; When the difference is less than the second threshold and greater than or equal to the third threshold, determine that the generated power is a third power value, and control the torque of the engine with the third power value to make the electric motor generate electricity, so that the current SOC value is equal to the SOC target point, wherein , the second power value is greater than the third power value; when the difference is equal to the fourth threshold value, determine the generated power as the fourth power value, and control the torque of the engine with the fourth power value to make the motor generate electricity, so that the current SOC value is equal to the SOC A target point, wherein the third threshold is greater than the fourth threshold, and the third power value is greater than the fourth power value. In addition, in the embodiment of the present invention, the first threshold, the second threshold, the third threshold and the fourth threshold decrease successively.

For example, when the difference between the SOC target point and the current SOC value is greater than or equal to A% (i.e. the first threshold), it is determined that the maximum generated power can be a kilowatt (i.e. the first power value), that is, the engine meets the driving condition , on the basis of the driving demand power of the whole vehicle, allocate more X power to the engine, that is, the power a kilowatt should be the power required by the whole vehicle driving + X, and control the torque of the engine with the power a kW to make the motor generate electricity. Make the current SOC value equal to the SOC target point; when the difference between the SOC target point and the current SOC value is less than A% and greater than or equal to B% (second threshold), it is determined that the maximum power generation can be b kilowatts, that is, the engine is driving Under the condition of , on the basis of the driving demand power of the whole vehicle, more Y power is allocated to the engine, that is to say, the power b kW should be the driving demand power of the whole vehicle + Y; when the difference between the SOC target point and the current SOC value is less than When B% is greater than or equal to C% (i.e. the third threshold), it is determined that the generated power can be at most c kilowatts, that is, the engine can distribute more Z power to the engine on the basis of the driving demand power of the whole vehicle under the condition of satisfying the driving requirements. , that is to say, the power c kilowatts should be the driving demand power of the whole vehicle + Z; when the difference between the SOC target point and the current SOC value is equal to 0% (that is, the fourth threshold), it is determined that the maximum generated power can be 0 kilowatts, namely Exit the driving power generation function, where a>b>c>0, X>Y>Z>0.

In order to enable those skilled in the art to understand the present invention more clearly, the present invention will be further described below in conjunction with FIG. 4 and FIG. 5 .

For example, assuming that the hybrid electric vehicle of the present invention provides the user with a setting interface of the SOC target point, the user can enter the SOC target point setting interface through the "driving setting" option of the multimedia main interface in the hybrid electric vehicle, and the user The setting of the SOC target point can be performed through the setting interface (S01). After the multimedia control module detects that the user has set the SOC target point, the multimedia control module can send the SOC target point (S02) set by the user to the motor controller, and at the same time, the multimedia control module memorizes the SOC target point (S02) set by the user ( S03). At this time, the power battery manager may send the current actual SOC value of the power battery to the motor controller (S04). After the motor controller receives the sum of the SOC target point set by the user and the current actual SOC value, it can judge the vehicle speed and the working state of the engine (S05), and at the same time judge the SOC target point and the current actual SOC value, and compare the two size, and adopt different control strategies according to the comparison results (S06).

After that, the charge and discharge control of the hybrid electric vehicle can be carried out according to the adopted control strategy: before the charge and discharge control of the hybrid electric vehicle is carried out according to the adopted control strategy, first, as shown in Figure 5, it is necessary to judge whether the hybrid electric vehicle is in the mode (ie HEV mode) (S501), if so, then further judge whether the engine is started (S502), if so, then further judge whether the target SOC (ie SOC target point) set by the user is less than the current actual SOC value (S503). If it is judged that the target SOC (that is, the SOC target point) is less than the current actual SOC value, enter the active discharge strategy (S504). Detect whether the temperature of each module is normal: the motor controller needs to collect motor temperature, water temperature, IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) temperature, and IPM temperature. When the temperature of each module is too high, the motor is not allowed to work; at the same time , it is also necessary to judge whether there is a collision signal at present: when the vehicle collides severely, in order to ensure personal safety, the drive system must be shut down immediately. When the motor controller judges that the temperature of each module is normal and the vehicle has no collision signal, it can be determined that the motor can participate in driving the whole vehicle. If the broken motor can meet the driving requirements, the rated M Kw motor power is allocated for driving, and the rest of the driving power is provided by the engine (S506).

If it is judged that the target SOC is equal to the current actual SOC value (S507), then enter the power maintenance strategy (S508), and judge whether the engine can alone satisfy the driving of the whole vehicle (S509), if so, keep the motor without output, and the battery does not discharge ( S510), if not, control the motor to participate in the output (S511), during this process, try to keep the power of the power battery unchanged. understandable. In the process of the power maintenance strategy, when controlling the motor to participate in the output, it can also be judged whether the difference between the current SOC value and the SOC target point is not within the preset range (such as plus or minus 1%), and if so, pass The battery energy is fed back to recover the power. If it is not there, it will determine to enter the corresponding active discharge strategy or driving power generation strategy according to the size between the current SOC value and the SOC target point.

If it is judged that the target SOC is greater than the current actual SOC value (S512), then enter the driving power generation strategy (S513), at this time, it is necessary to first judge whether the engine can meet the drive alone (S514), if not, then control the motor to participate in the output (S515), If yes, keep the motor without output, and the battery is not discharged (S516). Simultaneously if the difference between the target SOC and the current actual SOC value is greater than or equal to a%, then under the condition that the engine satisfies the drive, the multi-output X KW is used for driving power generation (S517); if the difference between the target SOC and the current actual SOC value is greater than or equal to is equal to b%, then under the condition that the engine satisfies the drive, the multi-output Y KW is used for power generation during driving (S518); if the difference between the target SOC and the current actual SOC value is greater than or equal to c%, then under the condition that the engine satisfies the drive, Multi-output Z KW is used for driving power generation (S519); if the target SOC and the current actual SOC value are equal to 0, then exit the driving power generation function (S520), wherein, a>b>c>0, X>Y>Z>0 . So that the current actual SOC value of the power battery is as close as possible to the SOC target point set by the user.

In summary, the present invention is mainly based on the energy-saving control method of the power motor, power battery and engine of the hybrid electric vehicle, that is, during the running of the hybrid electric vehicle, the motor controller monitors the SOC target point set by the user through multimedia, Vehicle power battery power, power battery charging and discharging power, engine working economic area, vehicle demand torque, vehicle speed and other working conditions, by adjusting the driving power generation function, motor and engine output torque distribution, the power battery power is close to the SOC target point .

Thus, the control method of the hybrid electric vehicle of the present invention enhances the interaction between the hybrid electric vehicle and the driver while taking into account the economical efficiency of the hybrid electric vehicle, that is, the driver can adjust the SOC target point through multimedia, so that the battery power of the power battery Keep at the level expected by the driver and meet the driver's demand for power battery power.

According to the control method of the hybrid electric vehicle in the embodiment of the present invention, the SOC target point set by the user is received through the control module, and the SOC target point set by the user is sent to the motor controller, and the motor controller obtains the current SOC value of the power battery , and select the corresponding control strategy according to the SOC target point set by the user and the current SOC value, and control the charging and discharging of the hybrid vehicle according to the selected control strategy when the power required by the vehicle is met, that is, by introducing the SOC The target point setting function realizes the driver's target control of the power battery power of the hybrid electric vehicle.

In order to realize the above embodiments, the present invention also proposes a control device for a hybrid electric vehicle.

Fig. 6 is a schematic structural diagram of a control device for a hybrid electric vehicle according to an embodiment of the present invention. As shown in FIG. 6 , the control device of the hybrid electric vehicle includes a control module 10 and a motor controller 20 .

Specifically, the control module 10 can be used to receive the SOC target point set by the user, and send the SOC target point set by the user to the motor controller 20 . For example, assume that the control device of the hybrid electric vehicle in the embodiment of the present invention provides the SOC target point setting function for the user, as shown in Figure 2, the SOC target point setting provided by the control device of the hybrid electric vehicle of the present invention for the user The schematic diagram of the interface, the user can set the SOC target point by manually sliding the slider in the setting interface as shown in Figure 2. When the control module 10 detects the SOC target point set by the user, the control module 10 can receive the SOC target point set by the user, and can send the SOC target point set by the user to the motor controller 20 . At the same time, the control module 10 can also memorize the SOC target point set by the user, so that the set SOC target point will still be defaulted when the power is turned on next time, until the user manually sets and changes the target point. Wherein, in the embodiment of the present invention, the setting range of the SOC target point may be within a preset range with the preset SOC target point as the center point. For example, as shown in FIG. 2 , the SOC target point can be set within a range of 15%-70%, that is, the user can set the SOC target point within the preset range (15%-70%).

The motor controller 20 can be used to obtain the current SOC value of the power battery, and select the corresponding control strategy according to the SOC target point set by the user and the current SOC value, and under the condition that the power required for driving the whole vehicle is met, according to the selected control strategy Charge and discharge control for hybrid electric vehicles.

Specifically, in the embodiment of the present invention, the motor controller 20 selects the corresponding control strategy according to the SOC target point set by the user and the current SOC value. The specific implementation process can be: when the SOC target point is smaller than the current SOC value, Select the active discharge strategy; when the SOC target point is equal to the current SOC value, select the battery power maintenance strategy; when the SOC target point is greater than the current SOC value, select the driving power generation strategy.

More specifically, the motor controller 20 can compare the SOC target point set by the user with the current SOC value, and select a corresponding control strategy according to the comparison result. For example, when the SOC target point is less than the current SOC value and the vehicle is driven by a hybrid system, the motor controller 20 can adopt an active discharge strategy to allow the power motor to participate in output power as much as possible to reduce engine fuel consumption. The direction of energy in can be shown in Figure 3(a). The motor controller can control the motor M to output torque with the preset discharge power. At this time, the power battery 1 drives the energy to the motor M through the inverter 2, that is, the motor M M assists the engine E to drive the drive wheel 3 to run.

For another example, when the SOC target point is equal to the current SOC value, the hybrid vehicle will try to keep the power of the power battery unchanged. Even if some power is consumed during driving, it will recharge the power battery through energy feedback to make the During the driving process of the hybrid electric vehicle, the power of the power battery is kept constant. At this time, the engine mainly outputs torque to the driving wheels. It can be understood that the battery power maintenance strategy is applicable to the maintenance mode of the vehicle.

For another example, when the SOC target point is greater than the current SOC value, the hybrid electric vehicle can charge the power battery by generating electricity while driving, so that the power can be as close as possible to the SOC target point set by the user. At this time, the energy trend in the hybrid electric vehicle can be As shown in Fig. 3(b), when the engine meets the drive condition, by controlling the engine E to run at high power so that part of the torque of the engine E is output to the motor M, the motor M charges the power battery 1 through work. That is to say, during the driving process of the hybrid power system, under the premise of ensuring the driving power required by the whole vehicle, the engine is controlled to run in the high-efficiency area so that part of the torque of the engine is output to the motor so that the motor can charge the power battery. The engine outputs torque to the drive wheels and the motor respectively. After receiving the output torque, the motor converts the mechanical energy into electrical energy to charge the power battery. It can be understood that this driving power generation strategy is applicable to the economical mode of the vehicle.

Specifically, in the embodiment of the present invention, the motor controller 20 can implement the active discharge strategy in the following manner: the motor controller 20 can first determine the current running state of the motor, and when the motor is currently in a stopped state, control the motor to start , and control the motor to work with the preset rated power to output torque so that the current SOC value is equal to the SOC target point; when the motor is currently running, judge whether the motor meets the motor drive requirements, and if so, directly use the preset rated power The motor is controlled to work to output torque so that the current SOC value is equal to the SOC target point. Wherein, in the embodiment of the present invention, the aforementioned preset rated power may be obtained from actual conditions such as engine matching and simulated road condition matching. That is to say, if the power battery is in a relatively high state, in order to reduce fuel consumption as much as possible, in the HEV mode (that is, the mode in which the engine and the motor cooperate to provide driving force to drive the vehicle), the motor controller 20 will distribute more torque to the vehicle. The motor outputs to consume the electric energy of the power battery. At this time, the motor and the engine jointly output torque to the driving wheels to help the vehicle run. It can be understood that this active discharge strategy is applicable to the sports mode of the vehicle.

It should be noted that when the motor controller 20 enters the active discharge strategy, the motor system can first self-check and judge that the motor can participate in driving, that is, check whether the temperature of each module is normal: the motor controller 20 needs to collect motor temperature, water temperature, and IGBT temperature , IPM temperature, when the temperature of each module is too high, the motor is not allowed to work; at the same time, it is also necessary to judge whether there is a collision signal: when the vehicle collides severely, in order to ensure personal safety, the drive system must be shut down immediately. When the motor controller 20 judges that the temperature of each module is normal and the vehicle has no collision signal, it can be determined that the motor can participate in driving the whole vehicle.

In the embodiment of the present invention, the motor controller 20 can implement the battery power maintenance strategy in the following manner: the motor controller 20 can first judge whether the engine can meet the driving requirements of the whole vehicle alone, and if so, control the motor to stop output and power The battery stops discharging. If not, control the motor to participate in the output, and further judge whether the difference between the current SOC value and the SOC target point is within the preset range. If yes, control the motor to regenerate energy. If not, then When it is judged that the SOC target point is greater than the current SOC value, the hybrid electric vehicle is controlled to enter the corresponding driving power generation strategy, or when the SOC target point is judged to be smaller than the current SOC value, the hybrid electric vehicle is controlled to enter the corresponding active discharge strategy. That is to say, when the motor controller 20 chooses to enter the battery power maintenance strategy, the motor controller 20 can first judge whether the engine can meet the driving requirements of the whole vehicle alone. The gear position of the gearbox, the engine speed and the external characteristic curve of the engine, even if the engine is output according to the maximum power, can not meet the driving power demand of the whole vehicle. Here, the driving means that the motor controller 20 judges the conditions such as the current vehicle speed, the depth of the accelerator pedal, and the gradient, and determines The current demand power of the vehicle. When judging that the engine alone can drive the whole vehicle, the motor does not output and the battery does not discharge; when the engine cannot alone drive the whole vehicle, control the motor to participate in the output, and then judge whether the difference between the current SOC value and the SOC target point is there Within the preset range (such as between plus and minus 1%), if it is, the motor energy will be fed back to recover the electric power, so that the power of the power battery remains unchanged during the driving of the hybrid electric vehicle; if not, then judge the current SOC value and The size of the difference between the SOC target points, and choose to enter the driving power generation strategy or the active discharge strategy according to the judgment result.

In the embodiment of the present invention, the motor controller 20 can implement the driving power generation strategy in the following manner: judge whether the engine alone can meet the driving requirements of the whole vehicle, if not, control the motor to participate in output, and if so, control the motor to stop output And the power battery stops discharging, and further judge whether the output torque of the engine is less than the preset value, if so, obtain the difference between the SOC target point and the current SOC value; and determine the power generation according to the difference, and control the engine according to the power generation The output of the electric motor is used to generate electricity, that is, to charge the power battery. Specifically, in the embodiment of the present invention, the motor controller 20 determines the generated power according to the difference, and controls the output of the engine according to the generated power to make the motor generate electricity, that is, the specific implementation process of charging the power battery can be: when When the difference is greater than or equal to the first threshold, it is determined that the generated power is the first power value, and the output of the engine is controlled according to the first power value; when the difference is smaller than the first threshold and greater than or equal to the second threshold, it is determined that the generated power is second power value, and control the output of the engine according to the second power value, wherein the first power value is greater than the second power value; when the difference is less than the second threshold and greater than or equal to the third threshold, it is determined that the generated power is the third power value, and control the output of the engine according to the third power value, wherein the second power value is greater than the third power value; when the difference is equal to the fourth threshold value, determine the generated power as the fourth power value, and The output of the engine is controlled, wherein the third threshold is greater than the fourth threshold, and the third power value is greater than the fourth power value. In addition, in the embodiment of the present invention, the first threshold, the second threshold, the third threshold and the fourth threshold decrease sequentially.

For example, when the difference between the SOC target point and the current SOC value is greater than or equal to A% (i.e. the first threshold), the motor controller 20 determines that the generated power can be a kilowatt at most, that is, the engine satisfies the driving condition and runs at full speed. On the basis of the power required by the vehicle drive, allocate X more power to the engine, that is, the power a kilowatt should be the power required by the vehicle + X, and use the power a kilowatt to control the torque of the engine to generate electricity for the motor, so that the current SOC value is equal to the SOC target point; when the difference between the SOC target point and the current SOC value is less than A% and greater than or equal to B% (second threshold), the motor controller 20 determines that the maximum power generation can be b kilowatts, that is, the engine is meeting Under the condition of driving, on the basis of the driving demand power of the whole vehicle, more Y power is allocated to the engine, that is to say, the power b kilowatts should be the driving demand power of the whole vehicle + Y; when the difference between the SOC target point and the current SOC value When it is less than B% and greater than or equal to C% (i.e. the third threshold), the motor controller 20 determines that the maximum generated power can be c kilowatts, that is, the engine satisfies the drive condition, and on the basis of the vehicle driving demand power Assign Z power to the engine, that is to say, the power c kilowatts should be the vehicle driving demand power+Z; when the difference between the SOC target point and the current SOC value is equal to 0% (i.e. the fourth threshold), the motor controller 20 determines The maximum power generation can be 0 kilowatts, that is, exit the driving power generation function, where a>b>c>0, X>Y>Z>0.

To sum up, during the driving process of the hybrid electric vehicle, the motor controller 20 monitors the SOC target point set by the user through multimedia, the power of the vehicle power battery, the charging and discharging power of the power battery, the working economic area of the engine, and the vehicle demand torque. , vehicle speed and other working conditions, by adjusting the driving power generation function, motor and engine output torque distribution, the power battery power is close to the SOC target point.

Thus, the control device of the hybrid electric vehicle of the present invention enhances the interaction between the hybrid electric vehicle and the driver while taking into account the economical efficiency of the hybrid electric vehicle, that is, the driver can adjust the SOC target point through multimedia, so that the electric power of the power battery Keep at the level expected by the driver and meet the driver's demand for power battery power.

According to the control device of the hybrid electric vehicle in the embodiment of the present invention, the SOC target point set by the user is received through the control module, and the SOC target point set by the user is sent to the motor controller, and the motor controller obtains the current SOC value of the power battery , and select the corresponding control strategy according to the SOC target point set by the user and the current SOC value, and control the charge and discharge of the hybrid vehicle according to the selected control strategy, that is, by introducing the setting function of the SOC target point, the driver can realize the The power battery power of the hybrid electric vehicle is controlled by target.

In order to realize the above embodiments, the present invention also proposes a hybrid electric vehicle, including the control device for the hybrid electric vehicle described in any one of the above embodiments.

According to the hybrid electric vehicle of the embodiment of the present invention, the SOC target point set by the user can be received by the control module in the control device, and the SOC target point set by the user can be sent to the motor controller, and the motor controller can obtain the current state of the power battery. SOC value, and select the corresponding control strategy according to the SOC target point set by the user and the current SOC value, and control the charge and discharge of the hybrid vehicle according to the selected control strategy, that is, by introducing the setting function of the SOC target point, the driving can be realized. The operator performs target control on the power battery power of the hybrid vehicle.

In the description of the present invention, it should be understood that the terms "first" and "second" are used for description purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Any process or method descriptions in flowcharts or otherwise described herein may be understood to represent modules, segments or portions of code comprising one or more executable instructions for implementing specific logical functions or steps of the process , and the scope of preferred embodiments of the invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including substantially concurrently or in reverse order depending on the functions involved, which shall It is understood by those skilled in the art to which the embodiments of the present invention pertain.

The logic and/or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium, For use with instruction execution systems, devices, or devices (such as computer-based systems, systems including processors, or other systems that can fetch instructions from instruction execution systems, devices, or devices and execute instructions), or in conjunction with these instruction execution systems, devices or equipment for use. For the purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use in or in conjunction with an instruction execution system, device, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: electrical connection with one or more wires (electronic device), portable computer disk case (magnetic device), random access memory (RAM), Read Only Memory (ROM), Erasable and Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program can be printed, since the program can be read, for example, by optically scanning the paper or other medium, followed by editing, interpretation or other suitable processing if necessary. The program is processed electronically and stored in computer memory.

It should be understood that various parts of the present invention can be realized by hardware, software, firmware or their combination. In the embodiments described above, various steps or methods may be implemented by software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques known in the art: Discrete logic circuits, ASICs with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. During execution, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, each unit may exist separately physically, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. If the integrated modules are realized in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (13)

1. the control method of a hybrid vehicle, it is characterised in that comprise the following steps:

Control module receives the SOC impact point that user sets, and the SOC impact point described user set sends to motor control Device processed；

Described electric machine controller obtains the current SOC value of electrokinetic cell；

The SOC impact point that described electric machine controller sets according to described user selects corresponding control plan with described current SOC value Slightly；And

Driving under required power meeting car load, the control strategy according to selecting carries out charge and discharge to described hybrid vehicle Electric control.

2. the control method of hybrid vehicle as claimed in claim 1, it is characterised in that described electric machine controller according to The SOC impact point that described user sets selects corresponding control strategy to specifically include with described current SOC value:

If described SOC impact point is less than described current SOC value, then select active discharge strategy；

If described SOC impact point is equal to described current SOC value, then battery electric quantity is selected to maintain strategy；

If described SOC impact point is more than described current SOC value, then select driving power generation strategies.

3. the control method of hybrid vehicle as claimed in claim 2, it is characterised in that described active discharge strategy has Body includes:

Judge the running status that motor is current；

When described motor is currently at halted state, controls described electric motor starting, and control described electricity with default rated power Machine works to export moment of torsion, so that current SOC value is equal to described SOC impact point；

When described motor is currently at running status, it is judged that whether motor meets motor drives demand, if it is, directly Control described motor with described default rated power to work to export moment of torsion, so that current SOC value is equal to described SOC impact point.

4. the control method of hybrid vehicle as claimed in claim 2, it is characterised in that described battery electric quantity maintains plan Slightly specifically include:

Judge whether electromotor can individually meet car load and drive requirement；

If it is determined that described electromotor can individually meet car load drives requirement, then control motor stopping output and electrokinetic cell stops Only electric discharge；

If it is determined that described electromotor can not individually meet car load drives requirement, then control described motor and participate in output, go forward side by side One step judges whether the difference between described current SOC value and described SOC impact point belongs in preset range；

If the difference between described current SOC value and described SOC impact point belongs in described preset range, then control described Electricity is reclaimed in motor power feedback；

If the difference between described current SOC value and described SOC impact point is not belonging in described preset range, then judging When described SOC impact point is more than described current SOC value, controls described hybrid vehicle and enter corresponding described driving generating Strategy, or when judging described SOC impact point less than described current SOC value, control described hybrid vehicle and enter phase The described active discharge strategy answered.

5. the control method of hybrid vehicle as claimed in claim 1, it is characterised in that setting of described SOC impact point Determine scope within the preset range of point centered by default SOC impact point.

6. the control method of hybrid vehicle as claimed in claim 2, it is characterised in that described driving power generation strategies has Body includes:

Judge whether electromotor can individually meet car load and drive requirement；

If it is determined that described electromotor can not individually meet car load drives requirement, then control motor and participate in output；

If it is determined that described electromotor can individually meet car load drives requirement, then control described motor and stop output and power current Pond stops electric discharge, and determines whether that whether the output moment of torsion of described electromotor is less than preset value；

If it is determined that the output moment of torsion of described electromotor less than described preset value, then obtain described SOC impact point and described currently Difference between SOC value；And

Determine generated output according to described difference, and control the output of described electromotor so that motor according to described generated output Generating.

7. the control method of hybrid vehicle as claimed in claim 6, it is characterised in that described true according to described difference Determine generated output, and control the output of described electromotor according to described generated output so that motor generating specifically includes:

When described difference is more than or equal to first threshold, determine that described generated output is the first performance number, and with described first Performance number controls the moment of torsion of electromotor so that motor generates electricity so that current SOC value is equal to described SOC impact point；

When described difference is less than described first threshold and is more than or equal to Second Threshold, determine that described generated output is the second merit Rate value, and control the moment of torsion of described electromotor with described second performance number so that motor generates electricity so that current SOC value is equal to Described SOC impact point, wherein, described first performance number is more than described second performance number；

When described difference is less than described Second Threshold and is more than or equal to three threshold values, determine that described generated output is the 3rd merit Rate value, and control the moment of torsion of described electromotor with described 3rd performance number so that motor generates electricity so that current SOC value is equal to Described SOC impact point, wherein, described second performance number is more than described 3rd performance number；

When described difference is equal to four threshold values, determine that described generated output is the 4th performance number, and with described 4th performance number Control the moment of torsion of described electromotor so that motor generating-charging so that current SOC value is equal to described SOC impact point, wherein, Described 3rd threshold value is more than described 4th threshold value, and described 3rd performance number is more than described 4th performance number；

And described first threshold, described Second Threshold, described 3rd threshold value and described 4th threshold value successively decrease successively.

8. the control device of a hybrid vehicle, it is characterised in that including: control module and electric machine controller, wherein,

Described control module, for receiving the SOC impact point that user sets, and the SOC impact point described user set is sent out Deliver to electric machine controller；

Described electric machine controller, for obtaining the current SOC value of electrokinetic cell, and the SOC target set according to described user Point selects corresponding control strategy with described current SOC value, and drives under required power, according to choosing meeting car load The control strategy selected carries out charge and discharge control to described hybrid vehicle.

9. the control device of hybrid vehicle as claimed in claim 8, it is characterised in that described electric machine controller is concrete For:

When described SOC impact point is less than described current SOC value, select active discharge strategy；

When described SOC impact point is equal to described current SOC value, battery electric quantity is selected to maintain strategy；

When described SOC impact point is more than described current SOC value, select driving power generation strategies.

10. the control device of hybrid vehicle as claimed in claim 8, it is characterised in that described SOC impact point Set point is within the preset range of point centered by default SOC impact point.

The control device of 11. hybrid vehicles as claimed in claim 9, it is characterised in that described electric machine controller has Body is used for:

Judge whether electromotor can individually meet car load and drive requirement；

If it is determined that described electromotor can not individually meet car load drives requirement, then control motor and participate in output；

If it is determined that described electromotor can individually meet car load drives requirement, then control described motor and stop output and power current Pond stops electric discharge, and determines whether that whether the output moment of torsion of described electromotor is less than preset value；

If it is determined that the output moment of torsion of described electromotor less than described preset value, then obtain described SOC impact point and described currently Difference between SOC value；And

Determine generated output according to described difference, and control the output of described electromotor so that motor according to described generated output Generating.

The control device of 12. hybrid vehicles as claimed in claim 11, it is characterised in that described electric machine controller has Body is used for:

When described difference is more than or equal to first threshold, determine that described generated output is the first performance number, and according to described the One performance number controls the output of electromotor；

When described difference is less than described first threshold and is more than or equal to Second Threshold, determine that described generated output is the second merit Rate value, and the output of described electromotor is controlled according to described second performance number, wherein, described first performance number is more than described the Two performance numbers；

When described difference is less than described Second Threshold and is more than or equal to three threshold values, determine that described generated output is the 3rd merit Rate value, and the output of described electromotor is controlled according to described 3rd performance number, wherein, described second performance number is more than described the Three performance numbers；

When described difference is equal to four threshold values, determine that described generated output is the 4th performance number, wherein, described 3rd threshold value More than described 4th threshold value, and according to the output of the described 4th performance number described electromotor of control, described 3rd performance number is more than Described 4th performance number；

And described first threshold, described Second Threshold, described 3rd threshold value and described 4th threshold value successively decrease successively.

13. 1 kinds of hybrid vehicles, it is characterised in that including: the mixing as according to any one of claim 8 to 12 The control device of power vehicle.