JPH0570748B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a vehicle power transmission device equipped with a continuously variable transmission.

[Prior Art] Conventionally, in the control of a control device for a vehicle power transmission device equipped with a continuously variable transmission, a drive (automatic shift range) that automatically changes the torque ratio according to vehicle running conditions has been used. D) A microwave;
There are engine braking ranges such as the low (L) range, and in the D range, for example, in order to perform the best fuel efficiency control, the engine brake speed is adjusted to achieve the best fuel economy speed of the engine according to the throttle opening.
The torque ratio of the continuously variable transmission is automatically controlled from the maximum torque ratio to the minimum torque ratio, and in the L range, the torque ratio of the continuously variable transmission is forcibly downshifted to obtain engine braking. ing.

[Problems to be Solved by the Invention] However, the vehicle power transmission device with the above configuration has D.
In the case of a range gear shift, the gears are automatically shifted according to a predetermined pattern depending on the vehicle driving conditions, so the driver's intentions are not always fully reflected, and depending on the driver, the feeling given may not be the best. do not have. For example, when a vehicle is driving on a mountain road, the gears are changed frequently as the accelerator pedal is turned on and off, reducing drivability. Also, when accelerating for overtaking, the vehicle upshifts against the driver's will, so it is difficult to I can't get enough acceleration. Furthermore, in the case of the L range, only one or two predetermined engine brake patterns can be selected, and it is not possible to obtain engine brake appropriate for all driving conditions.

The present invention provides a D range in which automatic shifting is possible using a switching means such as a shift lever, and an M range in which manual shifting is possible. ,
In the M range, the setting position can be arbitrarily selected by the driver's operation, and in this position, the torque ratio variable range setting means (for example, in the M range, the setting position is arbitrary) is used to set the torque ratio variable range of the continuously variable transmission. It is an object of the present invention to provide a control device for a power transmission device for a vehicle, which is provided with a shift lever that can be selected between the two positions, and is capable of manually changing the speed of a continuously variable transmission device according to the setting position of a variable torque ratio range setting means. do.

[Means for Solving the Problems] A control device for a vehicle power transmission device of the present invention is a vehicle power transmission device equipped with a continuously variable transmission device capable of continuously changing a torque ratio. a switching device 6 that switches between a first position and a second position by operation; and when the first position of the switching device 6 is selected,
a torque ratio automatic setting control device 5 that automatically controls the torque ratio of the continuously variable transmission from a maximum torque ratio to a minimum torque ratio according to vehicle running conditions; and a second position of the switching device 6 is selected. When the torque ratio range between the minimum torque ratio and the maximum torque ratio is set continuously such that the minimum torque ratio increases sequentially, the torque ratio can be set to any torque ratio by the driver's operation. Select a range and
a torque ratio variable range setting device 3 that outputs a signal indicating the minimum torque ratio in the torque ratio range; an input member rotation speed sensor 44 that detects the rotation speed of an input member of the continuously variable transmission; and the continuously variable transmission. an output member rotational speed sensor 42 that detects the rotational speed of the output member; a throttle opening sensor 41B that detects the throttle opening; a torque ratio control device 4 that controls the torque ratio of the continuously variable transmission; and an actuator 46 that changes the torque ratio between the input and output members of the continuously variable transmission according to the output signal of the torque ratio control device 4. The torque ratio control device 4 includes: a minimum torque ratio signal from a minimum torque ratio sensor 32 that detects a minimum torque ratio according to the operation amount of the variable torque ratio range setting device 3; and the output member rotation speed sensor 42. Input the output member rotation speed from
A set input rotation speed calculation means 47 that calculates the set rotation speed of the input member of the continuously variable transmission; and a signal from the throttle opening sensor 41B is inputted to calculate a preset table rotation corresponding to the throttle opening. A table rotation speed setting means 41 for setting the table rotation speed compares the table rotation speed with the set rotation speed, and when the set rotation speed is larger than the table rotation speed, the set rotation speed is set as the target rotation speed, and when it is smaller, the table rotation speed is set. A target rotation speed setting means 43 which sets the target rotation speed as a target rotation speed, and compares the target rotation speed calculated by the target rotation speed setting means 43 with the input member rotation speed from the input member rotation speed sensor 44, and determines the rotation speed. When the difference [(target rotation speed) - (input member rotation speed)] is larger than a predetermined value, a downshift signal that increases the torque ratio of the continuously variable transmission is output, and the rotation speed difference [(target rotation speed) - (input member rotation speed)] is smaller than zero, an upshift signal is output that reduces the torque ratio of the continuously variable transmission, and the rotation speed difference is reduced to zero. The present invention is characterized by comprising a shift signal generating means 45A that outputs a signal to maintain the torque ratio of the continuously variable transmission at the current torque ratio when the torque ratio is below a predetermined value.

[Operation and Effects of the Invention] The present invention provides a first position (D range) of the switching device.
When is selected, the torque ratio of the continuously variable transmission can be automatically changed from the maximum torque ratio to the minimum torque ratio according to vehicle running conditions.

Further, when the second position (M range) of the switching device is selected, the torque ratio variable range setting device sets the torque ratio range from the minimum torque ratio to the maximum torque ratio so that the minimum torque ratio increases sequentially. The driver can select any torque ratio range from among multiple continuously set torque ratio ranges, and the continuously variable transmission's torque is set to the minimum torque ratio in the driver's selected torque ratio range. In addition to being able to manually change the ratio, the torque ratio of the continuously variable transmission can be automatically changed from the maximum torque ratio to the minimum torque ratio according to the vehicle driving conditions within an arbitrary torque ratio range selected by the driver. I can do it.

Therefore, according to the present invention, it is possible to select between automatic gear shifting and manual gear shifting according to the driver's preference, and the automatic gear shifting pattern between the first position (D range) and the second position (M range) of the switching means can be selected. For example, the automatic shift pattern in the first position (D range) can be set as the best fuel efficiency shift pattern, and the automatic shift pattern in the second position (M range) can be set as the maximum power shift pattern. This has the effect that a speed change pattern can be obtained according to the user's preference.

In addition, when the second position (M range) of the switching device is selected, the torque ratio range can be set continuously using the torque ratio variable range setting device, so the torque ratio range can be set continuously according to the driver's will under any driving condition. It is possible to run. For example, when driving downhill, the minimum torque ratio in the torque ratio range can be selected depending on the slope of the downhill slope, so engine braking as with conventional multi-speed transmissions may be insufficient. The engine braking effect is not too strong or too effective, and the engine braking effect can be achieved as desired by the driver. Similarly, an appropriate torque ratio can be selected when climbing a slope or accelerating.

(b) The torque ratio variable range setting device allows you to drive while maintaining a desired torque ratio range, so when driving on mountain roads, the range in which gears are changed in response to changes in throttle opening and vehicle speed is reduced, making it less difficult to drive. There is no necessary shifting and the driving feeling is good.

By limiting the maximum torque ratio side of the torque ratio range, any torque ratio can be selected when starting, so when the friction coefficient of the road surface is low, such as on a snowy road, by selecting a position with a small torque ratio, the speed will be smoother. This allows for a smooth start.

D. By limiting the maximum torque ratio side of the torque ratio range, the creep force can be adjusted by changing the torque ratio when stopped.

[Embodiment] A control device for a vehicle power transmission device according to the present invention will be described based on an embodiment shown in the drawings.

A control device 1 for a vehicle power transmission device according to the present invention includes:
In a vehicle power transmission system equipped with a continuously variable transmission device 2 capable of continuously changing a torque ratio, a first position (D range) and a second position (M range) are switched by a driver's operation. When a shift lever 6, which is a switching device, and a first position of the switching device 6 are selected, the torque ratio of the continuously variable transmission is automatically changed from a maximum torque ratio to a minimum torque ratio according to vehicle running conditions. When the second position of the switching device 6 and the torque ratio automatic setting control device 5 are selected, the torque ratio range from the minimum torque ratio to the maximum torque ratio is such that the minimum torque ratio increases sequentially. A torque ratio variable range setting device 3 that selects an arbitrary torque ratio range from among a plurality of continuously set torque ratio ranges by operation of the driver and outputs a signal indicating the minimum torque ratio of the torque ratio range. , an input member rotational speed sensor 44 that detects the rotational speed of the input member of the continuously variable transmission, an output member rotational speed sensor 42 that detects the rotational speed of the output member of the continuously variable transmission, and a throttle opening. A throttle opening sensor 41B that detects the throttle opening, a torque ratio control device 4 that controls the torque ratio of the continuously variable transmission according to vehicle running conditions within the set torque ratio range of the torque ratio variable range setting device 3, and the torque ratio and an actuator 46 that changes the torque ratio between the input and output members of the continuously variable transmission according to the output signal of the control device 4.

In this embodiment, the continuously variable transmission 2 is a V-belt type continuously variable transmission 21.

The V-belt continuously variable transmission 21 includes an input shaft 22,
an output shaft 23 parallel to the input shaft 22;
Fixed flange 2 integrally formed with input shaft 22
4a and a movable flange 24b, the input pulley 24 is an input member of the V-belt type continuously variable transmission 21.
and an output pulley 25, which is an output member of the V-belt type continuously variable transmission 21, consisting of a fixed flange 25a and a movable flange 25b integrally formed with the output shaft 23, and the input pulley 24 and output pulley 25. V-shaped groove 24A of input pulley 24 and output pulley 25
By controlling the interval between the V-shaped grooves 25A, the torque ratio can be made steplessly variable.

The shift lever 6, which is a switching device, has a parking (P) range, a reverse (R) range, a neutral (N) range, a drive (D) range, and a manual (M) range. The manual (M) setting position of shift lever 6 is High.
A variable torque ratio range setting device 3 is provided, which is capable of reciprocating sliding from low to low, and outputs a signal depending on the setting position. The torque ratio variable range setting device 3 includes a minimum torque ratio sensor 32 that transmits the movement of the shift lever 6 to a potentiometer 31 and detects the minimum torque ratio in the torque ratio variable range based on the potential difference of the potentiometer 31.

6 and 7 are diagrams showing the relationship between the shift lever stroke and the minimum torque ratio.
The figure shows the case where the minimum torque ratio is set steplessly with respect to the shift lever stroke, and FIG. 7 shows the case where the minimum torque ratio is set steplessly with respect to the shift lever stroke.

The torque ratio control device 4 outputs a minimum torque ratio signal from a minimum torque ratio sensor 32 that detects a minimum torque ratio according to the operation amount of the torque ratio variable range setting device 3 and an output from the output member rotation speed sensor 42. a set input rotation speed calculation means 47 that inputs the rotation speed of the member and calculates the set rotation speed of the input member of the continuously variable transmission; and the throttle opening sensor 41
A table rotation speed setting means 41 inputs a signal from B and sets a preset table rotation speed corresponding to the throttle opening degree, and compares the table rotation speed with the set rotation speed and determines the set rotation speed. A target rotation speed setting means 43 that sets the set rotation speed as the target rotation speed when the rotation speed is larger than the table rotation speed, and sets the table rotation speed as the target rotation speed when it is smaller, and a target rotation speed calculated by the target rotation speed setting means 43. The input member rotation speed from the input member rotation speed sensor 44 is compared, and if the rotation speed difference [(target rotation speed) - (input member rotation speed)] is larger than a predetermined value, the torque ratio of the continuously variable transmission is determined. Outputs a downshift signal that increases the rotation speed difference [(target rotation speed) -
(input member rotational speed)] is smaller than zero, an upshift signal is output that reduces the torque ratio of the continuously variable transmission, and the rotational speed difference [(target rotational speed) -
(input member rotational speed)] is greater than or equal to zero and less than a predetermined value, shift signal generating means 4 outputs a signal to maintain the torque ratio of the continuously variable transmission at the current torque ratio.
It consists of 5A.

The automatic torque ratio setting control device 5 is activated when the driver selectively switches the shift lever 6 to the (D) range, and receives an engine speed (NE) signal from the engine speed sensor 41A and a throttle opening sensor 41B. throttle opening (θTH) signal,
Input the cooling water temperature (TW) signal from the cooling water temperature sensor 41C, the input pulley rotation speed (Ni) signal from the input pulley rotation speed sensor 44, and the output pulley rotation speed (No) signal from the output pulley rotation speed sensor 42. , outputs an output signal to the actuator 46 to automatically and variably control the torque ratio of the V-belt type continuously variable transmission 21.

The operation of this embodiment will be explained based on FIGS. 2 to 7.

FIG. 2 shows an operation flowchart of this embodiment.

Turn on the starter key, start the engine (101), set the initial value (102), and shift lever 6.
The set position (shift position) signal is input (103), and the engine speed (NE) from the engine speed sensor 41A and the throttle opening sensor 41 are input.
Input vehicle running conditions such as throttle opening (θTH) from B and coolant temperature (TW) from coolant temperature sensor 41C (104), and input pulley rotation speed sensor 4.
Input the input pulley rotation speed (Ni) from 4 (105), input the output pulley rotation speed (No) from the output pulley rotation speed sensor 42 (106), and set the minimum torque ratio of the torque ratio variable range setting device 3. Input the set minimum torque ratio (Tmin) from the sensor 32 (107),
Is the shift position P range, R range, N?
Range, D range, or M range is set (108), and when the P range is selected, the P range control subroutine is executed (109), and then the process returns to (103). When in the R range, execute the R range control subroutine (140), then return to (103),
When in the N range, perform the N range control subroutine (111), then return to (103), and when in the D range, perform the D range control subroutine (112), then return to (103), and return to M range. At this time, the M range control subroutine is executed (113), and then the process returns to (103).

FIG. 3 shows a subroutine for the D and N ranges.

The target rotation speed (best fuel efficiency data) of the input pulley corresponding to the throttle opening (θTH) is extracted from the D range table (Fig. 8) (121), and (target rotation speed) - (input pulley rotation speed) = A is It is determined whether A>H (hysteresis), A<0, or 0≦A≦H (122), and when A>H, a downshift signal is output to the actuator 46 (123), and the V-belt type continuously variable transmission is performed. Downshift aircraft 21. When A<0, an upshift signal is output to the actuator 46 (124) to upshift the V-belt type continuously variable transmission 21. When 0≦A≦H, actuator 46
outputs a signal to maintain the current torque ratio to 125,
The V-belt type continuously variable transmission 21 is maintained at the current torque ratio. Here, H means a predetermined value for providing hysteresis, and it defines a range in which the current torque ratio is maintained without changing gears in order to prevent the feeling from worsening due to frequent repetition of upshifts and downshifts. ing.

Figure 8 is a diagram showing the relationship between the table rotation speed and the throttle opening in the D range.This table rotation speed is determined to obtain the best fuel efficiency or the maximum power. be.

FIG. 4 shows the P, R range subroutine.

Outputs a signal to maintain the maximum torque ratio (131),
The V-belt type continuously variable transmission 21 is maintained at the maximum torque ratio.

FIG. 5 shows the M range subroutine.

The set input rotation speed of the input pulley is calculated from the minimum torque ratio (Tmin) from the minimum torque ratio sensor 32 and the output pulley rotation speed (No) from the output pulley rotation speed sensor 42 (141), and the M range table (9th The table rotation speed (Nt) of the input pulley corresponding to the throttle opening (θTH) is derived from the M range maximum power curve shown in the figure (142), and (set input rotation speed) - (table rotation speed) = B is 0. <B or B
It is determined whether or not ≦0 (143), and when B≦O, the table rotation speed is set as the target rotation speed (144), and when B>0, the set input rotation speed is set as the target rotation speed. When driving at high speed with a small torque ratio, if the set minimum torque ratio set by the driver's downshift operation is large, or if the target set input rotation speed exceeds the engine's allowable rotation speed. This may cause the engine to overrun. Therefore, the set input rotation speed is compared with the maximum value of the target rotation speed set near the engine's allowable rotation speed, and the difference (set input rotation speed) - (maximum value of the target rotation speed) = C is C > 0. or C≦0 (149),
When C≦0, the set input rotation speed is used as the target rotation speed (150), and when C>0, the maximum value of the target rotation speed is used as the target rotation speed (151), and the target rotation speed does not exceed the allowable rotation speed of the engine. This prevents the engine from overrunning. Next (target rotation speed) −
(Input pulley rotation speed) = A is H<A or A<0 or 0≦
It is determined whether A≦H (145), and when H<A, a downshift signal is output to the actuator 46 (146), and the V-belt continuously variable transmission 21 is downshifted. When 0≦A≦H, actuator 46
outputs a signal to maintain the current torque ratio (147),
Current torque ratio (i) of V-belt continuously variable transmission 21
to be maintained. When A<0, an upshift signal is output to the actuator 46 (148) to upshift the V-belt type continuously variable transmission 21.

Figure 9 is a diagram showing the relationship between the table rotation speed and the throttle opening in the M range.This table rotation speed is determined to obtain the best fuel efficiency or the maximum power. be.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a control device for a power transmission device for a vehicle according to the present invention, FIG. 2 is an operation flowchart of the control device for a power transmission device for a vehicle according to the present invention, and FIG. 3 is a block diagram of a control device for a power transmission device for a vehicle according to the present invention. D of the control device of the device;
N range subroutine, FIG. 4 shows the P and R range subroutine of the control device for the vehicle power transmission device of the present invention, and FIG. 5 shows the M range subroutine of the vehicle power transmission device of the present invention.
Range subroutine, FIG. 6 and FIG. 7 are graphs showing the relationship between the shift lever stroke and set torque ratio of the control device for the vehicle power transmission device of the present invention, and FIG. 8 is a graph showing the control of the vehicle power transmission device of the present invention. FIG. 9 is a graph showing the relationship between the throttle opening degree and the table rotation speed representing the D range best fuel economy curve of the device, and FIG. It is a graph showing the relationship between rotation speeds. In the figure, 1... a control device for a vehicle power transmission device;
2... Continuously variable transmission device, 3... Torque ratio variable range setting device, 4... Torque ratio control device, 5... Torque ratio automatic setting control device, 6... Switching device, 31...
Potentiometer, 32... Minimum torque ratio sensor, 41... Table rotation speed setting means, 42...
Output member rotation speed sensor, 43...Target rotation speed setting means, 44...Input member rotation speed sensor, 45A...
...Shift signal generation means, 46...Actuator, 47...Setting input rotation speed calculation means, 41A...
...Engine speed sensor, 41B...Throttle opening sensor, 41C...Cooling water temperature sensor.

Claims (1)

[Scope of Claims] 1. In a vehicle power transmission system equipped with a continuously variable transmission capable of continuously changing the torque ratio, a switching device that switches between a first position and a second position by operation by a driver. 6, and when the first position of the switching device 6 is selected,
a torque ratio automatic setting control device 5 that automatically controls the torque ratio of the continuously variable transmission from a maximum torque ratio to a minimum torque ratio according to vehicle running conditions; and a second position of the switching device 6 is selected. When the torque ratio range between the minimum torque ratio and the maximum torque ratio is set continuously such that the minimum torque ratio increases sequentially, the torque ratio can be set to any torque ratio by the driver's operation. Select a range and
a torque ratio variable range setting device 3 that outputs a signal indicating the minimum torque ratio in the torque ratio range; an input member rotation speed sensor 44 that detects the rotation speed of an input member of the continuously variable transmission; and the continuously variable transmission. an output member rotational speed sensor 42 that detects the rotational speed of the output member; a throttle opening sensor 41B that detects the throttle opening; a torque ratio control device 4 that controls the torque ratio of the continuously variable transmission; and an actuator 46 that changes the torque ratio between the input and output members of the continuously variable transmission according to the output signal of the torque ratio control device 4. The torque ratio control device 4 includes: a minimum torque ratio signal from a minimum torque ratio sensor 32 that detects a minimum torque ratio according to the operation amount of the variable torque ratio range setting device 3; and the output member rotation speed sensor 42. Input the output member rotation speed from
A set input rotation speed calculation means 47 that calculates the set rotation speed of the input member of the continuously variable transmission; and a signal from the throttle opening sensor 41B is inputted to calculate a preset table rotation corresponding to the throttle opening. A table rotation speed setting means 41 for setting the table rotation speed compares the table rotation speed with the set rotation speed, and when the set rotation speed is larger than the table rotation speed, the set rotation speed is set as the target rotation speed, and when it is smaller, the table rotation speed is set. A target rotation speed setting means 43 that sets the target rotation speed as a target rotation speed, and compares the target rotation speed calculated by the target rotation speed setting means 43 with the input member rotation speed from the input member rotation speed sensor 44, and determines the rotation speed. When the difference [(target rotation speed) - (input member rotation speed)] is larger than a predetermined value, a downshift signal that increases the torque ratio of the continuously variable transmission is output, and the rotation speed difference [(target rotation speed) - (input member rotation speed)] is smaller than zero, an upshift signal is output that reduces the torque ratio of the continuously variable transmission, and the rotation speed difference is reduced to zero. A control device for a power transmission device for a vehicle, comprising a shift signal generating means 45A that outputs a signal to maintain the torque ratio of the continuously variable transmission device at the current torque ratio when the torque ratio is below a predetermined value.