JPH0658143B2 - 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 In a conventional power transmission control system for a vehicle equipped with a continuously variable transmission such as a V-belt type or a traction type, a torque ratio is automatically changed according to the running state of the vehicle. Gear range drive (D)
A range and a low (L) range for engine braking are provided. In the D range, for example, the best fuel economy control is performed so that the best fuel economy speed of the engine is obtained according to the throttle opening. In addition, the torque ratio of the continuously variable transmission is automatically controlled. Further, in the L range, the torque ratio of the continuously variable transmission is forcibly downshifted so as to obtain engine brake.

[0003]

However, in the case of the D range, the continuously variable transmission having the above-described structure automatically shifts gears according to a predetermined pattern in accordance with the running state of the vehicle. It does not necessarily reflect the driver's will and the feeling given by some drivers is not the best. For example, when traveling on a mountain road, gear shifting is frequently performed due to ON / OFF of the accelerator, and the feeling of the vehicle deteriorates. Further, when accelerating for overtaking, the vehicle automatically upshifts against the driver's will. I can't get enough acceleration. Also in the case of the L range, only one predetermined engine brake pattern can be selected, and an appropriate engine brake according to all running conditions cannot be obtained.

The present invention is provided with a D range in which automatic shifting can be performed by a switching device such as a shift lever, and an M range in which manual shifting can be performed. In the D range, a continuously variable transmission is automatically operated according to vehicle traveling conditions. In the M range, a set position selecting device that allows the driver to select a desired setting position in the M range, for example, a shift lever that can arbitrarily select the setting position in the M range is provided. An object of the present invention is to provide a control device for a power transmission device for a vehicle, which is capable of manually shifting a continuously variable transmission according to a set position.

[0005]

A control device for a vehicle power transmission device of the present invention is a vehicle power transmission device provided with a continuously variable transmission capable of continuously changing a torque ratio. The switching device 6 for switching between the first position and the second position by means of, and when the first position of the switching device 6 is selected, the torque ratio of the continuously variable transmission is automatically adjusted according to the vehicle traveling conditions. When the torque ratio automatic setting control device 5 for controlling from the maximum torque ratio to the minimum torque ratio and the second position of the switching device 6 are selected, a plurality of continuously set torque ratios from the minimum torque ratio to the maximum torque ratio are set. A set position selection device 3 that selects and outputs an arbitrary torque ratio from among the torque ratios by a driver's operation, an input member rotation speed sensor 7 that detects the rotation speed of an input member of the continuously variable transmission, and Output of gearbox An output member rotation speed sensor 8 for detecting the rotation speed of the member, a torque ratio control device 4 for controlling the torque ratio of the continuously variable transmission according to the set position of the set position selection device 3, and the torque ratio control device. 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 No. 4, and the torque ratio control device 4 includes the input member rotation speed sensor 7 and the output. A current torque ratio detection means 41 for inputting an output signal from the member rotation speed sensor 8 to detect a current torque ratio of the continuously variable transmission, a current torque ratio from the current torque ratio detection means 41, and the set position selection. The set torque ratio signal from the set torque ratio detection device 32 that detects the torque ratio corresponding to the operation amount of the device 3 is input, and the ratio of the current torque ratio to the set torque ratio is less than a predetermined value smaller than 1. When it is open, 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, the shift signal generating means 44 outputs a signal for maintaining the torque ratio of the continuously variable transmission at the current torque ratio.

[0006]

According to the present invention, when the first position (D range) of the switching device is selected, the torque ratio of the continuously variable transmission varies from the maximum torque ratio to the minimum torque ratio in accordance with the vehicle traveling conditions. It is possible to shift automatically.

The second position of the switching device (M range)
When is selected, an arbitrary torque ratio can be continuously selected from the minimum torque ratio to the maximum torque ratio by the driver's operation by the set position selection device, and the continuously variable transmission can be set to the arbitrary torque ratio selected by the driver. The torque ratio can be manually changed.

Therefore, according to the present invention, there is an effect that the automatic shift and the manual shift can be selected according to the preference of the driver.

In particular, the second position of the switching device (M range)
When is selected, a) The torque ratio can be continuously set by the set position selection device, so that the driver can drive as desired in all driving conditions. For example, when traveling on a downhill, the torque ratio can be selected according to the gradient of the downhill, so that the engine brake as in the conventional multi-stage transmission is insufficient or the torque is not effective. It does not pass and the engine blur as the driver wants
Ki effect is obtained. Similarly, when climbing or accelerating, an appropriate torque ratio can be selected.

B) Since an arbitrary torque ratio can be selected at the time of starting by the set position selection device, when the friction coefficient of the road surface such as a snow road is low, a smooth start can be achieved by selecting a position with a small torque ratio. It will be possible.

C) Since the vehicle can travel with an arbitrary torque ratio fixed by the set position selecting device, the feeling of acceleration and deceleration like a manual transmission can be obtained.

D) The creep force can be adjusted by changing the torque ratio at the time of stop by the set position selection device.

(E) Since it is possible to travel with an arbitrary torque ratio fixed by the set position selection device, it is not necessary to change gears in response to changes in throttle opening and vehicle speed when traveling on mountain roads, etc. There is no gear change and the running feeling is good.

[0014]

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 of the power transmission device for a vehicle includes a V-belt type continuously variable transmission 21 which is a continuously variable transmission 2 capable of continuously changing the 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). A range), a set position 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 a driver's operation, The input member rotation speed sensor 7 for detecting the rotation speed of the input member of the continuously variable transmission, the output member rotation speed sensor 8 for detecting the rotation speed of the output member of the continuously variable transmission, and the set position selection device 3 And a 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. And an actuator 9 for changing the.

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 position selection device 3 that outputs a signal according to the set position is provided. The set position 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 sensor 7 and the output member rotation speed sensor 8 to detect the current torque ratio of the continuously variable transmission, and a current torque ratio detecting means. 41, the current torque ratio from the current torque ratio detection means 41, and the set position selection 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 the ratio is When the ratio is 1 or more, 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, a signal for maintaining the torque ratio of the continuously variable transmission at the current torque ratio. And a shift signal generating means 44 for outputting.

The torque ratio automatic 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 degree (θ) signal, a cooling water temperature (Tw) signal from the cooling water temperature detection sensor 51C, an input pulley rotation speed (Ni) signal from the input member rotation speed detection sensor 7, and an output member rotation speed detection sensor 8. The torque ratio of the V-belt type continuously variable transmission 21 is automatically changed over the range from the maximum torque ratio to the minimum torque ratio in accordance with the vehicle running conditions such as the output pulley speed (No) signal. , D range, the actuator 9 responds to the output signal of the torque ratio automatic setting control device 5 by the input pulley 24 and the output pulley 25.
The distance between the V-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), the shift position signal of the shift lever 6 is input (103),
The engine speed from the engine speed sensor 51A (N
e) signal, the throttle opening (θ) signal from the throttle opening sensor 51B, the cooling water temperature (Tw) signal from the cooling water temperature sensor 51C, etc. are input (10).
4) Input the input pulley rotation speed (Ni) signal from the input member rotation speed sensor 7 (105), and input the output pulley rotation speed (No) signal from the output member rotation speed sensor 8 ( 1
06), input the set torque ratio from the set position selection device 3 (107), and judge whether the shift position of the shift lever 6 is P range, R range, N range, D range or M range (108), and P range. In the case of, the P range control subroutine is performed (109) and then returns to (103). In the R range, the R range control subroutine is performed (110), then returns to (103) and the N range. At that time, N range control subroutine is performed (11
1) After that, return to (103), perform D range control subroutine when in D range (112), and then return to (103), and M range control when in M range.
Perform rousable routine (113) and then return to (103).

FIG. 3 shows the D and N range subroutines of the control device for a vehicle power transmission device according to the present invention. From the D range table best fuel consumption data (Fig. 9), 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 9
A downshift signal is output to (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 9 (124) to maintain the V-belt type continuously variable transmission 21 at the current torque ratio. When A <0, an upshift signal is output to the actuator 9 (125), and the V-belt type continuously variable transmission 21
Upshift.

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

FIG. 9 is a diagram showing the relationship between the target rotational 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 first embodiment of the control device for the power transmission system for vehicles according to the present invention.

The current torque ratio (i) is calculated from the input pulley rotation speed (Ni) from the input member rotation speed sensor 7 and the output pulley rotation speed (No) from the output member rotation speed sensor 8. (341).

The set torque ratio selected by the driver is
If the torque ratio is greater than the maximum allowable torque ratio at the current vehicle speed, the input pulley rotation speed exceeds the allowable rotation speed of the engine, and there is a risk that the engine will overrun.

Therefore, the maximum allowable torque ratio that can be obtained at the current vehicle speed is calculated from the output pulley rotation speed (No) and the maximum allowable rotation speed of the input pulley which is set near the allowable rotation speed of the engine ( 342), (maximum allowable torque ratio) / (set torque ratio) = C, it is determined whether C ≧ 1 or C <1 (34
3) When C ≧ 1, the set torque ratio is the target torque ratio (344), and when C <1 is the maximum allowable torque ratio is the target torque ratio (349). The target torque ratio can be the current vehicle speed. The maximum allowable torque ratio is not exceeded, and the input pulley speed does not exceed the allowable engine speed to prevent engine overrun.

Next, the current torque ratio and the target torque ratio are compared, and (current torque ratio) / (target torque ratio) = D is X>
It is determined whether D, D ≧ 1 or X ≦ D ≦ 1 (345), and X
When> D, a downshift signal is output to the actuator 9 (346) to downshift the V-belt type continuously variable transmission 21. When D ≧ 1, an upshift signal is output to the actuator 9 (348) to upshift the V-belt type continuously variable transmission 21. When X ≦ D ≦ 1, a signal for maintaining the current torque ratio (i) is output to the actuator 9 (34
7) Maintain the current torque ratio of the V-belt type continuously variable transmission 21.

Here, X means a coefficient for hysteresis, and the current torque ratio is maintained without shifting in order to prevent deterioration of the feeling due to frequent repetition of upshifting and downshifting. The range is set.

FIG. 8 shows an M range subroutine of the second embodiment of the control device for the power transmission system for vehicles of the present invention.

From other shift positions, the shift lever 6
When is set to the M range, 0 is read into the memory-A (441) and the input signal from the input member rotation speed sensor 7 is read.
The current torque ratio (i) is calculated from the rotational speed (Ni) and the output rotational speed (No) from the output member rotational speed sensor 8 (442), and the output rotational speed (No) and the input rotational speed (No) are calculated. -The maximum allowable torque ratio that can be obtained at the current vehicle speed is calculated from the maximum allowable rotation speed of the vehicle (443), and whether (maximum allowable torque ratio) / (set torque ratio) = C is C ≧ 1 or C <1. Judge (44
4), the set torque ratio when C ≧ 1 is set as the target torque ratio (4
45), then (current torque ratio) / (target torque ratio) = D
Is X> D, D ≧ 1 or X ≦ D ≦ 1 (44
6), when X> D, the memory-A is set to 1 (447), the downshift signal is output to the actuator 9 (448),
The V-belt type continuously variable transmission 21 is downshifted. X ≦
When D ≦ 1, a signal for maintaining the current torque ratio (i) is output to the actuator 9 (449) to maintain the current torque ratio of the V-belt type continuously variable transmission 21. Memory when D ≧ 1 -A
= 1 is determined (450), and when A = 1 is not satisfied (4
49), output an upshift signal to actuator 9 when A = 1 (451), and V-belt type continuously variable transmission 2
Upshift 1 When C <1 in (444), the maximum allowable torque ratio is set as the target torque ratio (452),
Then proceed to (446).

[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 a first control device for a vehicle power transmission device according to the present invention.
It is the M range subroutine of an Example.

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 second control device for a vehicle power transmission device according to the present invention.
It is the M range subroutine of an Example.

FIG. 9 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 Vehicle Power Transmission Device Control Device 2 Continuously Variable Transmission Device 3 Setting Position Selection Device 4 Torque Ratio Control Device 5 Torque Ratio Automatic Setting Control Device 6 Switching Device 7 Input Member Revolution Sensor 8 Output Member Revolution Sensor 9 Actuator 31 Potentiometer 32 Set Torque Ratio Detector 41 Current Torque Ratio Detector 44 Shift Signal Generator 51A Engine Speed Sensor 51B Throttle Opening Sensor 51C Cooling Water Temperature Sensor

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Sadahiro Koshiba 10 Takane, Fujii-cho, Anjo-shi, Aichi Aisin AW Co., Ltd. Examiner Hiroyuki Uchida

Claims (1)

[Claims] 1. A power transmission device for a vehicle, comprising a continuously variable transmission capable of continuously changing a torque ratio, and a switching device 6 for switching between a first position and a second position by a driver's operation. When the first position of the switching device 6 is selected, the torque ratio automatic setting control device 5 that automatically controls the torque ratio of the continuously variable transmission from the maximum torque ratio to the minimum torque ratio in accordance with the vehicle traveling conditions. When the second position of the switching device 6 is selected, an arbitrary torque ratio is selected by the driver's operation from a plurality of torque ratios continuously set from the minimum torque ratio to the maximum torque ratio. A set position selection device 3 for outputting, an input member rotation speed sensor 7 for detecting a rotation speed of an input member of the continuously variable transmission, and an output member rotation speed sensor for detecting an rotation speed of an output member of the continuously variable transmission. 8 and before The torque ratio control device 4 for controlling the torque ratio of the continuously variable transmission according to the set position of the set position selection device 3, and the input and output 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 sensor 7 and the output member rotation speed sensor 8 and outputs the output signal from the actuator. Current torque ratio detection means 41 for detecting the current torque ratio of the gear transmission, and set torque for detecting the current torque ratio from the current torque ratio detection means 41 and the torque ratio according to the operation amount of the set position selection device 3. The set torque ratio signal from the ratio detection device 32 is input, and when the ratio of the current torque ratio to the set torque ratio is smaller than a predetermined value smaller than 1, the torque ratio of the continuously variable transmission is increased. A downshift signal is output, and when the ratio is 1 or more, an upshift signal that reduces the torque ratio of the continuously variable transmission is output. When the ratio is equal to or more than a predetermined value and smaller than 1, the continuously variable transmission is output. A control device for a power transmission device for a vehicle, comprising: a shift signal generating means 44 for outputting a signal for maintaining the torque ratio at the current torque ratio.