KR102846594B1 - Transmission control method for vehicle - Google Patents

Abstract

The present invention relates to a method for controlling transmission of a vehicle,
It may include a step of receiving a shift target stage, a step of detecting a shift case of the shift target stage after the receiving step, a step of detecting a change in shifting, a step of changing a controller parameter having a slow response speed or a controller parameter having a fast response speed in response to a response time of the shift case according to the detection of the shift change, and a step of controlling a motor having a response speed for each shift case.
In addition, the transmission control method of the above vehicle can be implemented in various ways depending on the embodiment.

Description

Transmission control method for vehicle

The present invention relates to a transmission control method for a vehicle, and more particularly, to a transmission control method for a vehicle capable of securing control stability by implementing a constant motor response speed according to a vehicle environment when shifting a gear of the vehicle.

Typically, a transmission can be controlled to vary its gear ratio to maintain a constant engine RPM depending on vehicle speed, and a shift lever is provided inside the vehicle to allow the driver to change the gear ratio of the transmission.

The transmission's shift mode includes a manual shift mode where the driver can manually change gears, and an automatic shift mode where the gears are automatically changed according to vehicle speed when the driver selects the drive gear (D).

Additionally, a sports mode is used that can perform both manual and automatic transmission modes. The sports mode basically performs automatic transmission mode, while the driver performs manual transmission mode by shifting up or down the gears. Automatic transmission mode is generally composed of transmission ranges including P gear used when the vehicle is parked, D gear used for moving the vehicle forward, R gear used for moving the vehicle backward, and N gear which blocks the engine output from being transmitted to the driving wheels.

Recently, a shift-by-wire system has been used, which transmits operation signals according to the driver's operation of the shift lever through an electronic shift lever instead of a mechanical shift lever connected to the transmission by a mechanical cable, and controls the transmission according to the operation signals.

A shift-by-wire system does not transmit the driver's shift lever operation force to the transmission through a mechanical connection structure, but rather, a transmission control unit including an actuator receives an operation signal according to the driver's shift lever operation from an electronic shift lever and controls the transmission. When the electronic shift lever is used, the movement of the lever is detected through a sensor and a signal corresponding to the selected gear is transmitted to the TCU (Transmission Control Unit). The TCU transmits a control signal to the transmission control unit, which controls the gear of the automatic transmission, thereby changing the gear. The transmission control unit is also called a TRCM (Transmission Range Control Module).

In general, the transmission control device determines the position based on the P gear, which is the parking gear, and then detects the positions of the R gear, N gear, and D gear based on the P gear position to determine the position of each gear.

The voltage in these vehicles, generated by the alternator and battery, is not always constant and fluctuates significantly. Furthermore, engine compartment temperatures fluctuate significantly depending on air temperature. This inconsistent voltage and engine compartment temperature can lead to inconsistent motor control.

Specifically, when looking at motor control, higher voltages result in faster response, while lower voltages result in slower response. Furthermore, higher temperatures reduce friction between the mechanical and motor components, resulting in overshoot. Lower temperatures increase friction between the mechanical and motor components, requiring higher output.

That is, when the gear of the transmission control device is shifted, the residual hydraulic pressure of the TCU cannot be released, which may cause strong torque and vehicle shock every time the gear is shifted.

Therefore, the TCU requires time for hydraulic pressure to drain, and a corresponding shift-specific response speed control algorithm is required. In other words, a method capable of variably controlling shift parameters is needed to optimize control for each shift case.

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Republic of Korea Publication Patent No. 10-2013-0128169 (Application date: May 16, 2012)

The technical problem to be achieved by the present invention is to provide a transmission control method for a vehicle capable of uniformly maintaining motor responsiveness adaptive control according to changes in the external environment.

In addition, the technical problem to be achieved by the present invention is to provide a vehicle transmission control method that can always output a constant motor response speed by monitoring the voltage of the battery and the temperature of the vehicle engine room at regular intervals.

In addition, the technical problem to be achieved by the present invention is to provide a method for controlling transmission of a vehicle that can secure control stability of a control transmission by implementing a constant motor response speed.

The objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the description below.

A method for controlling transmission of a vehicle according to an embodiment of the present invention,

A step of receiving a gear shift target; and

After the above receiving step, a step of detecting a shift case of the shift target stage is included,

The step of detecting the above shift case is:

This is a step to check the motor response time according to the change from the existing stage to the target stage among at least one of the vehicle's P, R, N, and D stages.

A step of changing the controller parameters to have a slow response speed in response to the response time when the existing stage of the above-mentioned transmission case is a specific existing stage and the target stage is a specific target stage, or changing the controller parameters to have a fast response speed when it is not a specific existing stage and a specific target stage; and

It may include a step of controlling a motor having a response speed for each of the above gear cases.

The above specific existing unit may be a D unit or an R unit, and the specific target unit may be a P unit.

In the above shift case, the response time of the motor moving from a specific existing gear to a specific target gear may be the longest.

The response time for each of the above shift cases may include different times.

In the above controller parameter change step

When changing from the existing gear to the gear for changing the gear, the response time may be changed to a controller parameter with a slow response speed in case of a gear change with a relatively large response time, or to a controller parameter with a fast response speed in case of a gear change with a relatively small response time.

The step of controlling the above motor is:

A monitoring step for observing a first module of a vehicle and a second module of the vehicle;

A step of detecting a change in the above monitoring step;

A step of applying or not applying a change amount to the motor control output according to the detected change or non-change in detection; and

The above variable step may include a step of implementing a constant response speed when controlling the gear shift of the transmission.

In the above monitoring step,

The above first module is the voltage of the vehicle battery,

The above second module may be the temperature of the vehicle engine room.

The above monitoring step is,

A step of measuring the vehicle battery voltage; and

The first module monitoring step of the step of measuring the amount of change in the vehicle battery voltage; and

A step of measuring the temperature of the engine room of the vehicle; and

The second module monitoring step may include a step of measuring the change in temperature of the engine room of the vehicle.

The above first monitoring step can observe the first module and the second module according to a set time.

The step of implementing the above constant response speed may include adaptive proportional control.

Specific details of other embodiments are included in the detailed description and drawings.

The transmission control method of a vehicle according to an embodiment of the present invention as described above has the advantage of being able to uniformly maintain motor responsiveness adaptive control according to changes in the external environment.

In addition, the transmission control method of a vehicle according to an embodiment of the present invention has the advantage of being able to always output a constant motor response speed by monitoring the voltage of the battery and the temperature of the vehicle engine room at regular intervals, thereby ensuring transmission control stability.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Figure 1 is a control flowchart schematically showing a transmission control method of a vehicle according to one embodiment of the present invention.
FIG. 2 is a drawing schematically showing gear shifting according to a conventional gear and a target gear in a gear shift control method of a vehicle according to one embodiment of the present invention.
FIG. 3 is a diagram showing a response time according to a shift case in a vehicle shift control method according to one embodiment of the present invention.
FIG. 4 is a drawing showing a method of motor control in a method for controlling transmission of a vehicle according to one embodiment of the present invention.
FIG. 5 is a diagram showing a monitoring step of a first module and a second module in a transmission control method of a vehicle according to one embodiment of the present invention.
Figure 6 is a graph showing the motor response speed according to the vehicle environment of the general first module and second module.
FIG. 7 is a graph showing a motor response speed according to a vehicle environment in a vehicle transmission control method according to one embodiment of the present invention.

The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

Accordingly, in some embodiments, well-known process steps, well-known structures, and well-known techniques are not specifically described to avoid obscuring the present invention.

The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise. As used herein, the terms "comprises" and/or "comprising" are used to mean that they do not exclude the presence or addition of one or more other components, steps, operations, and/or elements other than the mentioned components, steps, operations, and/or elements. In addition, "and/or" includes each and every combination of one or more of the mentioned items.

In addition, the embodiments described in this specification will be described with reference to cross-sectional drawings and/or schematic drawings, which are ideal examples of the present invention. Accordingly, the form of the examples may be modified due to manufacturing technology and/or tolerances, etc. Accordingly, the embodiments of the present invention are not limited to the specific forms illustrated, but also include changes in form resulting from the manufacturing process. In addition, each component in each drawing illustrated in the present invention may be illustrated to some extent enlarged or reduced for convenience of explanation. Like reference numerals refer to like components throughout the specification.

Hereinafter, a vehicle gear shift control method (10) will be described according to embodiments of the present invention.

Fig. 1 is a control flowchart schematically illustrating a vehicle shift control method (10) according to one embodiment of the present invention. Fig. 2 is a diagram schematically illustrating shifting according to a conventional gear and a target gear in a vehicle shift control method (10) according to one embodiment of the present invention. Fig. 3 is a diagram illustrating response times according to shift cases in a vehicle shift control method (10) according to one embodiment of the present invention.

Referring to FIGS. 1 to 3, a vehicle transmission control method (10) according to one embodiment of the present invention is, in general, to monitor the battery voltage of the vehicle and the engine room temperature of the vehicle, and control the motor to output a constant response speed accordingly, while applying a ratio value (adaptive parameter) to the final output of the motor.

Specifically, the vehicle gear control method (10) may include a step of receiving a gear target stage (S10), a step of detecting a gear case (S20), a step of confirming whether it is a specific existing stage or a specific target stage (S30), a step of varying a controller parameter (S51, S52), and a step of controlling a motor (S60).

The driver controls the gear shift for driving or parking the vehicle, and for this purpose, the gear that needs to be changed from the existing gear (also called the ‘existing gear’) can be received (also called the ‘target gear’).

When the above-mentioned shift target stage is received, the shift case of the shift target stage can be detected. Specifically, the motor response time according to the change from at least one of the P, R, N, and D stages of the vehicle (the existing stage) to another stage (a shift stage different from the existing stage, which can be referred to as a “target stage”) can be detected.

For example, as in Fig. 2, if the existing stage is stage P, the target stage can be stage R, stage N, or stage D. If the existing stage is stage R, the target stage can be stage D, stage N, or stage P. If the existing stage is stage N, the target stage can be stage D, stage N, or stage P. In addition, if the existing stage is stage D, the target stage can be stage N, stage P, or stage R.

Accordingly, referring to FIG. 3, the response speed at room temperature and a predetermined temperature, for example, -30 degrees, can be confirmed according to the gear change from the existing gear to the target gear. That is, when the gear is changed from the existing gear to the target gear (when changing according to the gear case), the response time may have different response times from A to L or A' to L', as the time for the hydraulic pressure of the TCU to be released is required. In addition, in the gear case, the response times (J and J') of the gear change from R gear to P gear or the response times (L and L') of the gear change from D gear to P gear may have the longest response times. This may correspond to a specific existing gear and a specific target gear.

After receiving the above-described shift target stage, it is necessary to control the response speed according to the shift case. That is, for optimal control according to the above-described shift case, the motor response speed can be variably controlled through shift parameters, for example, the shift parameters of the first module of the vehicle's battery voltage and the second module of the vehicle's engine room temperature, which will be described later.

As described above, after detecting a shift case, it is possible to determine whether the existing gear and the target gear of the shift case are specific existing gears and specific target gears. For example, in the shift case and in the case where the existing gear is changed to the target gear, there is a shift change with a long response time.

When changing gear from the above existing gear to the above target gear, it can be confirmed that the change from the existing gear of P gear to the target gear of D gear and the change from the existing gear of R gear to the changed gear of P gear have a high response time compared to other gear changes.

Accordingly, in the above shift case, in the shift change from the existing gear of P to the changed gear of D, P can be said to be a specific existing gear and D can be said to be a specific target gear. In addition, in the above shift case, in the shift change from the existing gear of R to the changed gear of P, R can be said to be a specific existing gear and P can be said to be a specific target gear.

As described above, when a gear change occurs from the existing gear to the target gear, confirmation is requested as to whether the gear change from the existing gear to the target gear corresponds to the specific existing gear or not.

Depending on whether the gear change is made from the specific reference stage to the specific target stage, the response time of the gear case according to the detection of the gear change may be changed to a controller parameter having a slow response speed or a controller parameter having a fast response speed.

For example, as described above, the response time can be checked in the above shift case by detecting the shift change depending on whether it is a change from the existing gear of D to the target gear of P or from the existing gear of R to the target gear of P. That is, it can be confirmed that the response time is the longest in the case of a change from the existing gear of D to the target gear of P and a change from the existing gear of R to the target gear of P. This may mean that a lot of time is required for the hydraulic pressure of the TCU to drain. In the case of the above shift change, that is, in the case of a shift change with the longest response time (change from D to P or change from R to P), the controller parameter with a slow response speed should be changed, and in the case of a non-the above shift change, that is, in the case of a non-change shift with the longest response time, the controller parameter with a fast response speed can be changed.

After changing the above controller parameters, a motor having a response speed for each gear case can be controlled.

Fig. 4 is a diagram showing a method of motor control in a vehicle transmission control method (10) according to one embodiment of the present invention. Fig. 5 is a diagram showing a monitoring step of a first module and a second module in a vehicle transmission control method (10) according to one embodiment of the present invention.

Referring to FIGS. 4 and 5, the step (S60) of controlling the motor of the present invention can be described.

Specifically, the step of controlling the motor (S60) may include a step of observing the first module and the second module of the vehicle (S61), a step of detecting a change (S62), a step of applying or not applying the change to the motor control output (S63-1, S63-2), and a step of implementing the motor speed at a constant level (S64).

The step (S61) of observing the first module and the second module, i.e., the monitoring step, can measure the first module and the second module and measure the amount of change to detect the amount of change.

Specifically, as described above, variable parameters of the vehicle, i.e., the first module of the vehicle and the second module of the vehicle, can be observed. The first module is the voltage of the vehicle battery among the variable parameters of the vehicle, and the second module is the temperature of the engine room of the vehicle among the variable parameters of the vehicle.

Accordingly, the monitoring step may include a first module monitoring step (S611) for monitoring the first module and a second module monitoring step (S612) for monitoring the second module.

Specifically, through the first module monitoring step, the vehicle battery voltage is measured (S6111), and the amount of change in the vehicle battery voltage is measured (S6112). In addition, through the second module monitoring step (S612), the temperature of the vehicle engine room can be measured (S6121), and the amount of change in the temperature of the vehicle engine room can be measured (S6122).

The above monitoring step (S61) can observe the first module and the second module according to a set time.

For example, it is possible to monitor changes in the vehicle's battery voltage and engine room temperature every 10 seconds, detecting changes and detecting the amount of change.

The first module monitoring and the second module monitoring according to one embodiment of the present invention have been described as being implemented during the motor control phase, but are not limited thereto. For example, various modifications or changes are possible, such as the first module and second module monitoring being performed even before the control phase based on the response time.

After the above monitoring step, it is possible to detect whether a change has occurred in the external environment of the vehicle.

That is, after detecting changes in the battery voltage of the above vehicle and the temperature of the engine room of the above vehicle, it is detected whether changes have occurred.

Accordingly, a change amount can be applied or not applied to the motor control output depending on the detected change or non-change in the detection of the first module and the second module.

For example, if a change in the battery voltage is detected, a change in the motor control output corresponding to the change in the battery voltage can be applied accordingly. In addition, if a change in the engine room temperature is detected, a change in the motor control output corresponding to the change in the engine room temperature can be applied accordingly. In addition, unlike the above, if both a change in the battery voltage and a change in the temperature of the vehicle engine room are detected, a change in the respective changes can be applied.

In addition, in contrast, if there is no change in the battery voltage of the first module, specifically the vehicle, or in the engine room temperature of the second module, specifically the vehicle, no change is applied to the motor control output.

Fig. 6 is a graph showing the motor response speed according to the vehicle environment of the general first module and second module. Fig. 7 is a graph showing the motor response speed according to the vehicle environment in the vehicle transmission control method (10) according to one embodiment of the present invention.

Referring to FIGS. 6 and 7, a constant response speed can be implemented when controlling the gear shift of the transmission through the variable step.

That is, when the environmental change of the vehicle is not applied as before, that is, the change in the first module and the second module is not reflected, when looking at the final output of the motor, it can be confirmed that the motor response speed varies depending on the vehicle environment.

However, as in the present invention, when there is a change in the first module or the second module as described above, the changed value is applied to the final output of the motor, and when there is no change in the first module or the second module, the final output of a general motor is implemented, thereby implementing a constant response speed of the motor.

For example, if the vehicle's battery voltage is 9V and the motor's final output is implemented as 100%, the motor's final output can be implemented as 80% at 13V, and the motor's final output can be controlled to be implemented as 60% at 16V.

Accordingly, a constant motor response speed and control stability can be obtained even when the vehicle's environment changes, such as changes in temperature and voltage.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without altering the technical concept or essential features thereof. Therefore, the embodiments described above should be understood to be illustrative in all respects and not restrictive.

10: Vehicle gear shift control method

Claims (10)

In a method for controlling transmission of a vehicle,
Step of receiving a gear shift target;
After the above receiving step, a step of detecting a shift case to check the motor response time according to a change from an existing stage to a target stage at least one of the P stage, R stage, N stage, and D stage of the vehicle;
A step of confirming whether the existing stage and the target stage of the above-mentioned shift case are specific existing stages and specific target stages;
A step of changing the controller parameter to a slow response speed in response to the response time when the existing stage and the target stage of the above-mentioned transmission case are the specific existing stage and the specific target stage, or changing the controller parameter to a fast response speed when the existing stage and the target stage are not the specific existing stage and the specific target stage; and
A method for controlling gear shifting of a vehicle, comprising a step of controlling a motor having a response speed for each gear shift case. In the first paragraph,
A method for controlling gear shifting of a vehicle in which the above-mentioned specific existing gear is D gear or R gear and the specific target gear is P gear. In the second paragraph,
A method for controlling gear shifting of a vehicle in which the response time of a motor moving from a specific existing gear to a specific target gear in the above gear shift case is the longest. In the second paragraph,
A method for controlling gear shifting of a vehicle, wherein the response time for each gear shift case includes different times. In the first paragraph, in the controller parameter changing step
A method for controlling gear shifting of a vehicle in which, when changing from an existing gear to a gear for changing, a controller parameter with a slow response speed is changed in the case of a gear change with a relatively large response time, or a controller parameter with a fast response speed is changed in the case of a relatively small gear change. In the first paragraph, the step of controlling the motor comprises:
A monitoring step for observing a first module of a vehicle and a second module of the vehicle;
A step of detecting a change in the above monitoring step;
A step of applying a change amount to the motor control output according to the detected change; and
A method for controlling gear shifting of a vehicle, comprising a step of implementing a constant response speed when controlling gear shifting of a transmission through the above-described applying step. In the sixth paragraph, in the monitoring step,
The above first module checks the voltage of the vehicle battery,
The above second module is a vehicle transmission control method that checks the temperature of the vehicle engine room. In the seventh paragraph, the monitoring step,
A step of measuring the vehicle battery voltage; and
The first module monitoring step of the step of measuring the change in the vehicle battery voltage; and
A step of measuring the temperature of the engine room of the vehicle; and
A method for controlling transmission of a vehicle, comprising the second module monitoring step of measuring a change in temperature of the engine room of the vehicle. In paragraph 8,
The above first monitoring step is a vehicle transmission control method that observes the first module and the second module according to a set time. In paragraph 6,
A method for controlling transmission of a vehicle, wherein the step of implementing the above constant response speed includes adaptive proportional control.