JPH0656207B2 - Control device for vehicle power transmission device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a vehicle power transmission device having a continuously variable transmission.

[0002]

2. Description of the Related Art A power transmission device for a vehicle equipped with a continuously variable transmission in which a torque ratio of the continuously variable transmission can be arbitrarily set by operating a shift lever or a shift switch provided in a driver's seat. The so-called automatic transmission D range, which automatically changes the torque ratio according to the running state of the vehicle, and the M range, etc., during engine braking or manual traveling, are provided. In order to perform the control, the torque ratio of the continuously variable transmission is automatically controlled so that the engine has the best fuel consumption rotational speed according to the throttle opening. Further, in the M range, the torque ratio of the continuously variable transmission is controlled to an arbitrary torque ratio set by the driver's operation, and the set torque ratio is sequentially changed by the driver's operation to enable manual running and torque. By selecting an arbitrary torque ratio from a steady running state with a small ratio,
You can get Ki.

[0003]

SUMMARY OF THE INVENTION The vehicle power transmission device having the above-described structure has a small torque ratio (overdrive state).
If you want to improve engine braking by selecting M range by shifting down operation of shift lever, shift switch, etc. and setting a large torque ratio while running at high speed,
If the torque ratio is set too high, the engine will overrun.

Therefore, an object of the present invention is to provide a control device for a power transmission device for a vehicle, which prevents the engine from overrunning during a downshift during high speed running.

[0005]

A control device for a power transmission device for a vehicle according to the present invention is a control device for a power transmission device for a vehicle provided with a continuously variable transmission capable of continuously changing a torque ratio. A set torque ratio selection device 3 for selecting and outputting an arbitrary torque ratio by a driver's operation from a plurality of torque ratios continuously set from the torque ratio to the maximum torque ratio, and an input member of the continuously variable transmission. According to the set position of the set torque ratio selection device 3; And a torque ratio control device 4 for controlling the torque ratio of the continuously variable transmission, and an actuator for changing 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 receives the output signals from the input member rotation speed detection sensor 7 and the output member rotation speed detection sensor 8 to detect the current torque ratio of the continuously variable transmission. The present torque ratio detecting means 41, and the set torque from the present torque ratio detecting means 41, which detects the present torque ratio from the present torque ratio detecting means 41 and the torque ratio according to the operation amount of the set torque ratio selecting device 3. When the ratio of the current torque ratio to the set torque ratio is smaller than a predetermined value smaller than 1, a downshift signal for increasing the torque ratio of the continuously variable transmission is output, and when the ratio is 1 or more, the ratio signal is input. An upshift signal for reducing the torque ratio of the continuously variable transmission is output, and when the ratio is equal to or more than a predetermined value and smaller than 1, the torque ratio of the continuously variable transmission is changed to the current torque. Shift signal generating means 42 for outputting a signal for maintaining the input member rotation speed, and the shift signal generating means 42 when the input member rotation speed from the input member rotation speed detection sensor 7 is input and the input member rotation speed exceeds a set value. And a downshift prevention means 43 for outputting to the actuator 9 a signal for maintaining the torque ratio of the continuously variable transmission at the current torque ratio irrespective of the signal output by the actuator.

[0006]

According to the present invention, when the driver operates the set torque ratio selection device during high speed traveling to downshift, even if the selected torque ratio is too large, the input member rotation speed is increased. When the value exceeds the set value near the maximum allowable engine speed, the torque ratio of the continuously variable transmission is maintained at the current torque ratio regardless of the signal output by the shift signal generator. The member rotation speed does not exceed the maximum allowable rotation speed of the engine, and the engine overrun can be prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A control system for a vehicle power transmission device according to the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 is a block diagram of a control device for a vehicle power transmission device according to the present invention.

In the present embodiment, the control device 1 for a vehicle power transmission device includes a V-belt type continuously variable transmission 21 which is a continuously variable transmission 2 capable of continuously changing a torque ratio, and a driver's operation. The shift lever 6 which is a switching device for switching between the first position (D range of automatic shift) and the second position (M range of manual shift), and when the first position of the shift lever 6 is selected, A torque ratio automatic setting control device 5 for automatically controlling the torque ratio of the continuously variable transmission from the maximum torque ratio to the minimum torque ratio in accordance with vehicle traveling conditions, and a second position of the shift lever 6 (M for manual gear shifting). When a range is selected, a set torque ratio selection device 3 that selects and outputs an arbitrary torque ratio from a plurality of torque ratios continuously set from the minimum torque ratio to the maximum torque ratio by the driver's operation. An input member rotational speed detection sensor 7 for detecting the rotational speed of the input member of the continuously variable transmission, an output member rotational speed detection sensor 8 for detecting the rotational speed of the output member of the continuously variable transmission, and the set torque. A torque ratio control device 4 for controlling the torque ratio of the continuously variable transmission according to the set position of the ratio selection device 3, and an input and output member of the continuously variable transmission according to an output signal of the torque ratio control device 4. And an actuator 9 for changing the torque ratio between them.

The V-belt type continuously variable transmission 21 includes an input shaft 2
2, an output shaft 23 arranged in parallel with the input shaft 22, a fixed flange 24a provided on the input shaft 22 and integrally molded with the input shaft 22, and a movable flange 24b sliding on the input shaft 22 in the axial direction. Input pulley 24 and output shaft 23 having
Between the output pulley 25, the input pulley 24, and the output pulley 25, which have the fixed flange 25a provided above and integrally molded with the output shaft 23 and the movable flange 25b that slides on the output shaft 23 in the axial direction. Consists of a V-belt 26 stretched over
The effective diameters of the V-shaped grooves 24A and 25A of the input pulley 24 and the output pulley 25 are increased or decreased so that the torque ratio can be changed steplessly.

The shift lever 6, which is a switching device, sets each of a parking (P) range, a reverse (R) range, a neutral (N) range, a drive (D) range, and a manual (M) range. Have a position. The manual (M) set position of the shift lever 6 can be slid back and forth from HIGH to LOW, and a set torque ratio selection device 3 that outputs a signal according to the set position is provided.
The set torque ratio selection device 3 includes a set torque ratio detection device 32 that transmits the movement of the shift lever 6 to the potentiometer 31 and detects the set torque ratio by the potential difference of the potentiometer 31.

FIGS. 6 and 7 are diagrams showing the relationship between the shift lever stroke and the set torque ratio. In FIG. 6, the set torque ratio is set steplessly with respect to the shift lever stroke. FIG. 7 shows the case, and FIG.
The following shows the case where the set torque ratio is set in multiple stages with respect to C.

The torque ratio control device 4 receives the output signals from the input member rotation speed detection sensor 7 and the output member rotation speed detection sensor 8 to detect the current torque ratio of the continuously variable transmission, and a current torque ratio detection means. 41, the current torque ratio from the current torque ratio detection means 41 and the set torque ratio signal from the set torque ratio selection device 3 are input, and the ratio of the present torque ratio to the set torque ratio is less than a predetermined value smaller than 1. When it is small, a downshift signal for increasing the torque ratio of the continuously variable transmission is output, and when the ratio is 1 or more, an upshift signal for decreasing the torque ratio of the continuously variable transmission is output, and the ratio is a predetermined value. When it is equal to or more than 1 and is smaller than 1, shift signal generating means 42 for outputting a signal for maintaining the torque ratio of the continuously variable transmission at the current torque ratio, and the input member rotational speed detection When the input member rotational speed from the sensor 7 is input and the input member rotational speed exceeds a set value, the torque ratio of the continuously variable transmission is set to the current torque ratio regardless of the signal output by the shift signal generating means 42. Downshift prevention means 4 for outputting a signal to be maintained to the actuator 9
3 and 3.

The automatic torque ratio setting control device 5 operates when the shift lever 6 is set to the D range, and an engine speed (Ne) signal from the engine speed detection sensor 51A and a throttle from the throttle opening detection sensor 51B. An opening (θ) signal, a cooling water temperature (Tw) signal from the cooling water temperature detection sensor 51C, an input member rotation speed (Ni) signal from the input member rotation speed detection sensor 7, and an output member from the output member rotation speed detection sensor 8. It is configured to automatically change the torque ratio of the V-belt type continuously variable transmission 21 within the range of the maximum torque ratio to the minimum torque ratio in accordance with the vehicle traveling conditions such as the rotation speed (No) signal, and to the D range. When set,
The actuator 9 responds to the output signal of the torque ratio automatic setting control device 5 with V of the input pulley 24 and the output pulley 25.
The space between the character-shaped grooves 24A and 25A is controlled.

FIG. 2 shows an operation flow chart of the control device of the power transmission system for a vehicle of the present invention.

The starter key is turned on to operate the engine (101), the initial value is set (102), and the shift position signal of the shift lever 6 is input (103).
Engine speed (Ne) signal from engine speed detection sensor 51A, throttle opening (θ) signal from throttle opening detection sensor 51B, cooling water temperature detection sensor 51C
The vehicle running conditions such as the cooling water temperature (Tw) signal from the engine are input (104), the input pulley rotation speed (Ni) signal from the input member rotation speed detection sensor 7 is input (105), and the output member rotation speed is input. Output pulley speed from detection sensor 8 (No)
A signal is input (106), a set torque ratio is input from the set torque ratio selection device 3 (107), and it is determined whether the shift position of the shift lever 6 is the P range, the R range, the N range, the D range or the M range. (108), P in P range
Perform range control subroutine (109), then return to (103), perform R range control subroutine in the R range (110), and then perform (10).
Return to (3), perform N range control subroutine when N range (111), then return to (103), perform D range control subroutine when D range (112), and then ( 103) and perform M range control subroutine when in M range (11
3) After that, it returns to (103).

FIG. 3 shows the D and N range subroutines of the control device for the vehicle power transmission device according to the present invention. From the D range table best fuel consumption data (Fig. 8), the target rotation speed (best fuel consumption data) of the input pulley corresponding to the throttle opening (θ) is drawn (121), (target rotation speed). -(Input pre-rotation speed) = A is H <A, 0 ≦ A ≦ H, A <
It is judged whether it is 0 (122), and when H <A, the actuator 4
A downshift signal is output to 5 (123) to downshift the V-belt type continuously variable transmission 21. When 0 ≦ A ≦ H, a signal for maintaining the current torque ratio is output to the actuator 45 (124), and the V-belt type continuously variable transmission 21 is maintained at the current torque ratio. When A <0, an upshift signal is output to the actuator 45 (125) to upshift the V-belt type continuously variable transmission 21.

Here, H means a predetermined value for setting the hysteresis, and in order to prevent the gear shift from being frequently repeated upshifting and downshifting, the current state is maintained without shifting. It defines the range that maintains the torque ratio.

FIG. 8 is a diagram showing the relationship between the target opening speed of the input pulley and the throttle opening of the D range.
The target rotational speed of the input pulley is determined so as to obtain the best fuel economy or maximum power.

FIG. 4 shows the P and R range subroutines of the control device for a vehicle power transmission device according to the present invention.

The P, R range subroutine outputs a signal for maintaining the maximum torque ratio (131) to control the torque ratio of the V-belt type continuously variable transmission 21 to the maximum torque ratio.

FIG. 5 shows an M-range subroutine of the control device for the vehicle power transmission device of the present invention.

From the input pulley rotation speed (Ni) from the input member rotation speed detection sensor 7 and the output pulley rotation speed (No) from the output member rotation speed detection sensor 8, the current torque ratio (i) is obtained.
Is calculated (201).

Next, the current torque ratio and the set torque ratio are compared, and (current torque ratio) / (set torque ratio) = C is X>
It is judged whether C, C ≧ 1 or X ≦ C <1 (202), and X
When> C, {(maximum allowable input rotation speed)-(input pre-rotation speed)} = B is judged to be B> 0 or B ≦ 0 (20
3) When B> 0, a downshift signal is output to the actuator 9 (206) to downshift the V-belt type continuously variable transmission 21. When X ≦ C <1 in (202) and B ≦ 0 in (203), the actuator-
A signal for maintaining the current torque ratio (i) is output to the motor 9 (2
07), the current torque ratio of the V-belt type continuously variable transmission 21 is maintained. When C ≧ 1, an upshift signal is output to the actuator 9 (208) to upshift the V-belt type continuously variable transmission 21.

Here, X means a coefficient for hysteresis, and in order to prevent the gearing from being deteriorated due to frequent upshifting and downshifting, the current torque ratio is maintained without shifting. The range is set.

In the present invention, when the downshift signal is output to the actuator 9, the maximum allowable input rotation speed set near the maximum allowable rotation speed of the engine is compared with the input pulley rotation speed, and {( Maximum allowable input rotation speed)-(input pre-rotation speed)} = B, when B ≦ 0, the downshift signal is not output, but the signal that maintains the current torque ratio is output, thereby Re-rotation speed should not exceed the maximum allowable engine rotation speed and the engine over
Runs can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram of a control device for a vehicle power transmission device according to the present invention.

FIG. 2 is a flowchart of a control device for a vehicle power transmission device according to the present invention.

FIG. 3 is a block diagram of a control device N for a vehicle power transmission device according to the present invention;
It is a D range subroutine.

FIG. 4 is a view showing P of a control device for a vehicle power transmission device according to the present invention,
R range subroutine.

FIG. 5 is an M range subroutine of the control device for the vehicle power transmission device of the present invention.

FIG. 6 is a diagram showing a relationship between a stepless shift lever stroke and a set torque ratio of a control device for a vehicle power transmission device according to the present invention.

FIG. 7 is a diagram showing a relationship between a multistage shift lever stroke and a set torque ratio of a control device for a vehicle power transmission device according to the present invention.

FIG. 8 is a diagram showing a D range table of a control device for a vehicle power transmission device according to the present invention.

[Explanation of symbols]

 1 Control device for power transmission device for vehicle 2 Continuously variable transmission device 3 Set torque ratio selection device 4 Torque ratio control device 5 Automatic torque ratio setting control device 6 Switching device 31 Potentiometer 32 Set torque ratio detection device 7 Input member rotation Number detection sensor 8 Output member rotation speed detection sensor 9 Actuator 41 Current torque ratio detection means 42 Shift signal generation means 43 Downshift prevention means 51A Engine rotation speed detection sensor 51B Throttle opening detection sensor 51C Cooling water temperature detection sensor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F16H 59:70 9240-3J

Claims (1)

[Claims] 1. A control device for a vehicle power transmission device comprising a continuously variable transmission capable of continuously changing a torque ratio, wherein a plurality of torque ratios are continuously set from a minimum torque ratio to a maximum torque ratio. Set torque ratio selection device 3 for selecting and outputting an arbitrary torque ratio by the driver's operation from among
An input member rotation speed detection sensor 7 for detecting a rotation speed of an input member of the continuously variable transmission; an output member rotation speed detection sensor 8 for detecting a rotation speed of an output member of the continuously variable transmission; A torque ratio control device 4 for controlling the torque ratio of the continuously variable transmission according to the set position of the torque ratio selection device 3.
And an actuator 9 for changing 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, wherein the torque ratio control device 4 includes the input member. Current torque ratio detecting means 4 for detecting current torque ratio of the continuously variable transmission by inputting output signals from the rotation speed detection sensor 7 and the output member rotation speed detection sensor 8.
1 and the current torque ratio from the current torque ratio detecting means 41 and the set torque ratio signal from the set torque ratio detecting device 32 for detecting the torque ratio according to the operation amount of the set torque ratio selecting device 3 are input. When the ratio of the current torque ratio to the set torque ratio is smaller than a predetermined value smaller than 1, a downshift signal for increasing the torque ratio of the continuously variable transmission is output, and when the ratio is 1 or more, the continuously variable transmission is output. Shift signal generating means 42 for outputting an upshift signal for reducing the torque ratio, and for outputting a signal for maintaining the torque ratio of the continuously variable transmission at the current torque ratio when the ratio is equal to or more than a predetermined value and less than 1. The input member rotational speed from the input member rotational speed detection sensor 7 is input, and when the input member rotational speed exceeds a set value, the shift signal generating means 42 outputs the signal. It said Warinaku signal to maintain the torque ratio of the continuously variable transmission to current torque ratio actuator - a control device for a vehicle power transmission device characterized by comprising the downshift inhibiting means 43 for outputting the data 9.