JPH0658138B2 - 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, the setting position can be arbitrarily selected by the driver's operation.
At this position, an input rotation speed variable range setting device for setting the input rotation speed variable range of the continuously variable transmission, for example, a shift lever whose setting position can be arbitrarily selected in the M range is provided, and the input rotation speed variable range setting is performed. 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 of the device.

[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 second position of the torque ratio automatic setting control device 5 for controlling from the maximum torque ratio to the minimum torque ratio and the switching device 6 is selected, the input rotation speed variable between the minimum input rotation speed and the maximum input rotation speed. A variable input speed variable range is selected by a driver's operation from a plurality of input speed variable ranges that are continuously set so that the minimum input speed is increased sequentially. Indicates the minimum input speed of the range Input variable speed range setting device 3 that outputs a signal, an input member speed sensor 7 that detects the speed of the input member of the continuously variable transmission, and a speed of the output member of the continuously variable transmission. Output member speed sensor 8
And a throttle opening sensor 5 for detecting the throttle opening
1B, a torque ratio control device 4 for controlling a torque ratio of a continuously variable transmission according to a vehicle traveling condition within a set input speed variable range of the input speed variable range setting device 3, and the torque ratio control device 4 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 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. From the torque ratio detecting means 41 and the minimum rotation speed detecting device 32 for detecting the minimum input rotation speed according to the operation amount of the output member rotation speed from the output member rotation speed sensor 8 and the input rotation speed variable range setting device 3. And a signal from the throttle opening sensor 51B for inputting the minimum input rotational speed of the above and calculating the set torque ratio, and a table preset corresponding to the throttle opening. A table for calculating the table torque ratio by inputting the rotational speed and the output member rotational speed from the output member rotational speed sensor 8.
The table torque ratio calculation means 42, the table torque ratio from the table torque ratio calculation means 42, and the set torque ratio from the set torque ratio calculation means 45 are input, and the ratio of the table torque ratio to the set torque ratio is input. When the ratio is 1 or less, the set torque ratio is the target torque ratio, and when the ratio is 1 or more, the target torque ratio setting means 43 sets the table torque ratio as the target torque ratio, and the present torque ratio from the present torque ratio detecting means 41. And a target torque ratio from the target torque ratio setting means 43, and when the ratio of the current torque ratio to the target 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, an upshift signal for reducing the torque ratio of the continuously variable transmission is output, and the ratio is equal to or more than a predetermined value. And the 1 when smaller, characterized in that a shift signal generator 44 for outputting a signal for maintaining the torque ratio of the continuously variable transmission to 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, the input rotation speed variable range setting device continuously sets the input rotation speed variable range between the minimum input rotation speed and the maximum input rotation speed so that the minimum input rotation speed is sequentially increased. The input variable speed range can be selected by the driver from the variable input speed range, and the input of the continuously variable transmission will be the minimum input speed of the variable input speed range selected by the driver. The torque ratio of the continuously variable transmission can be controlled (manual shift) so as to match the rotation speeds, and automatic shifts can be performed according to vehicle driving conditions within an arbitrary input rotation speed variable range selected by the driver. You can

Therefore, according to the present invention, the automatic shift or the manual shift can be selected according to the driver's preference, and the automatic shift between the first position (D range) and the second position (M range) of the switching device can be selected. Since the pattern can be changed, for example, the automatic shift pattern at the first position (D range) is the best fuel consumption shift pattern, and the automatic shift pattern at the second position (M range) is the maximum. It can be a power shift pattern, and has an effect that a shift pattern according to the driver's preference can be obtained.

The second position of the switching device (M range)
When is selected, a) The input speed variable range setting device can continuously set the input speed variable range, so that the driver can drive as desired in all driving conditions. For example, when traveling on a downhill, the minimum input speed in the variable input speed range can be selected in accordance with the slope of the downhill, so that an engine brake such as a conventional multi-speed transmission can be obtained. The engine braking effect that the driver desires can be obtained without being insufficient or not too effective. Similarly, even when climbing a slope or accelerating, the minimum input rotation speed within an appropriate input rotation speed variable range can be selected.

(B) Regardless of the input rotation speed variable range set by the input rotation speed variable range setting device, the vehicle can be started with the maximum torque ratio when the vehicle starts, so that the starting acceleration is not impaired.

(C) During engine braking, if an arbitrary minimum input speed is set by the input speed variable range setting device, the torque ratio is set according to the vehicle speed, and the torque ratio increases as the vehicle speed decreases. As described above, a smooth engine brake corresponding to the vehicle speed can be obtained.

D) If an arbitrary input speed variable range is set by the input speed variable range setting device, the torque ratio is set according to the vehicle speed. There is no gear shifting and the running feel is good.

[0013]

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). When (Range) is selected, the input rotation speed variable range between the minimum input rotation speed and the maximum input rotation speed is set so that the minimum input rotation speed sequentially increases. Driving from inside Of the input rotation speed variable range setting device 3 for selecting an arbitrary input rotation speed variable range and outputting a signal indicating the minimum input rotation speed of the input rotation speed variable range, and an input member of the continuously variable transmission. An input member rotation speed sensor 7 for detecting the rotation speed, an output member rotation speed sensor 8 for detecting the rotation speed of the output member of the continuously variable transmission, and a throttle opening sensor 51B for detecting the throttle opening.
A torque ratio control device 4 for controlling a torque ratio of the continuously variable transmission according to a setting position of the input speed variable range setting device 3, and 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 the input and output members.

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 an input rotation speed variable range setting device 3 that outputs a signal according to the set position is provided. The input rotation speed variable range setting device 3 transmits the movement of the shift lever 6 to the potentiometer 31, and the minimum rotation speed for detecting the minimum input rotation speed of the input rotation speed variable range by the potential difference of the potentiometer 31. It comprises a detection device 32.

FIGS. 6 and 7 are diagrams showing the relationship between the shift lever stroke and the set minimum input speed, and FIG. 6 shows that the set minimum input speed is not set for the shift lever stroke. FIG. 7 shows the case where the minimum input rotation speed is set in multiple stages for the shift lever stroke.

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, a set torque ratio calculating means 45 for calculating the set torque ratio by inputting the output member rotation speed from the output member rotation speed sensor 8 and the minimum input rotation speed from the input rotation speed variable range setting device 3. Engine speed (Ne) from the engine speed sensor 51A, throttle opening (θ) from the throttle opening sensor 51B, cooling water temperature (Tw) from the cooling water temperature sensor 51C.
Such as a predetermined value that corresponds to the vehicle driving conditions such as
A table torque ratio (Nt) and an output member speed (No) from the output member speed sensor 8 to set a table torque ratio (it).
The table torque ratio from the table torque ratio calculation means 42 and the set torque ratio from the set torque ratio calculation means 45 are input, and when the ratio of the table torque ratio to the set torque ratio is 1 or less, the set torque ratio is set. Is a target torque ratio, and when the ratio is 1 or more, a target torque ratio setting means 43 for setting a table torque ratio as a target torque ratio, a current torque ratio from the current torque ratio detecting means 41 and the target torque ratio setting means. When the ratio of the current torque ratio to the target 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 input. 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 a predetermined value or more and less than 1, the above Shift signal generating means 44 for outputting a signal for maintaining the torque ratio of the variable transmission to current torque ratio
Consists of.

The torque ratio automatic setting control device 5 operates when the shift lever 6 is set to the D range, and the engine speed (Ne) from the engine speed sensor 51A and the throttle opening (from the throttle opening sensor 51B). θ), the cooling water temperature (Tw) from the cooling water temperature sensor 51C, 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 It is configured to automatically change the torque ratio of the V-belt continuously variable transmission 21 within the range of the maximum torque ratio to the minimum torque ratio according to the vehicle running conditions such as The controller 9 controls the interval between the V-shaped grooves 24A and 25A of the input pulley 24 and the output pulley 25 in accordance with the output signal of the torque ratio automatic setting control device 5.

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

The starter key is turned on to operate the engine (301), the initial value is set (302), the shift position signal of the shift lever 6 is input (303),
The engine speed from the engine speed sensor 51A (N
e), the throttle opening (θ) from the throttle opening sensor 51B and the cooling water temperature (T) from the cooling water temperature sensor 51C.
w) and other vehicle traveling conditions are input (304), the input pulley rotation speed (Ni) from the input member rotation speed sensor 7 is input (305), and the output pull from the output member rotation speed sensor 8 is input.
Re-rotation speed (No) is input (306), and the set minimum rotation speed of the input rotation speed variable range setting device 3 is input (307).
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 (30
8) When the P range is selected, the P range control subroutine is performed (309), and then the process returns to (303), and when the R range is selected, the R range control subroutine is performed (31).
0), then return to (303), perform N range control subroutine at N range (311), then return to (303), and D range control at D range.
The routine is performed (312) and then returned to (303). When in the M range, the M range control subroutine is performed (313), and then returned to (303).

FIG. 3 shows the D and N range subroutines of the control device for a vehicle power transmission device according to the present invention.

D range table best fuel consumption data (8th
The target rotation speed (best fuel consumption data) of the input pulley corresponding to the throttle opening (θ) is drawn from (Fig.) (121),
(Target rotation speed)-(Input pulley rotation speed) = A, H <A
It is determined whether 0 ≦ A ≦ H or A <0 (122), and H <
At the time of A, a downshift signal is output to the actuator 9 (123), and the V-belt type continuously variable transmission 21 is downshifted. 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, output an upshift signal to the actuator 9 (125),
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 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. 8 is a graph 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 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 ( 311). Minimum set speed and output pulley speed (N
o) the set torque ratio is calculated (312), the table rotation speed corresponding to the throttle opening is read from the M range table (Fig. 9), and the table torque ratio is calculated from the output pulley rotation speed. Calculate (313), (table torque ratio) /
(Set torque ratio) = D is determined whether D ≦ 1 or D> 1 (314), and when D ≦ 1, the set torque ratio is set as the target torque ratio (315), and then the current torque ratio and the target are set. The torque ratio is compared to determine whether (current torque ratio) / (target torque ratio) = E is X> E, E ≧ 1, or X ≦ E <1 (31
6) When X> E, a downshift signal is output to the actuator 9 (317) to downshift the V-belt type continuously variable transmission 21. When E ≧ 1, an upshift signal is output to the actuator 9 (319) to upshift the V-belt type continuously variable transmission 21. When X ≦ E <1, a signal for maintaining the current torque ratio (i) is output to the actuator 9 (318) to maintain the current torque ratio of the V-belt type continuously variable transmission 21. In (314), when D> 1, the table torque ratio is set as the target torque ratio (320), and then (31)
Proceed to 6).

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.

FIG. 9 is a diagram showing the relationship of the table rotation speed with respect to the throttle opening in the M range. The table rotation speed is determined so as to obtain the best fuel economy or takes the maximum power. It is decided by.

[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 rotational speed 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 rotational speed of the 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.

FIG. 9 is a diagram showing an M range table of a control device for a vehicle power transmission device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control device for vehicle power transmission device 2 Continuously variable transmission device 3 Input rotation speed variable range setting device 4 Torque ratio control device 5 Automatic torque ratio setting control device 6 Switching device 7 Input member rotation speed sensor 8 Output member rotation speed sensor 9 Actuator 31 Potentiometer 32 Minimum speed detection device 44 Shift signal generation means 42 Table torque ratio setting means 45 Set torque ratio calculation means 43 Target torque ratio setting means 41 Current torque ratio detection means 51A Engine speed sensor 51B Throttle opening sensor 51C Cooling water temperature sensor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F16H 59:42 9240-3J

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. And when the second position of the switching device 6 is selected, the input rotation speed variable range between the minimum input rotation speed and the maximum input rotation speed is continuously set so that the minimum input rotation speed increases sequentially. An input rotation speed variable range that selects an arbitrary input rotation speed variable range by a driver's operation from among a plurality of input rotation speed variable ranges and outputs a signal indicating the minimum input rotation speed of the input rotation speed variable range. Setting device 3 and the stepless An input member rotation speed sensor 7 for detecting the rotation speed of the input member of the transmission, an output member rotation speed sensor 8 for detecting the rotation speed of the output member of the continuously variable transmission, and a throttle opening degree for detecting the throttle opening degree. Sensor 51B
A torque ratio control device 4 for controlling the torque ratio of the continuously variable transmission according to the vehicle running condition within the set input speed variable range of the input speed variable range setting device 3; An actuator 9 for changing the torque ratio between the input and output members of the continuously variable transmission according to an output signal. The torque ratio control device 4 includes the input member rotation speed sensor 7 and the output member rotation. A current torque ratio detection means 41 for detecting the current torque ratio of the continuously variable transmission by inputting an output signal from the speed sensor 8, an output member rotational speed from the output member rotational speed sensor 8 and the input rotational speed variable. A set torque ratio calculation means 45 for calculating a set torque ratio by inputting the minimum input rotation speed from the minimum rotation speed detection device 32 that detects the minimum input rotation speed according to the operation amount of the range setting device 3; Inputs the signal from the liter opening sensor 51B,
A table torque ratio calculating means 42 for calculating a table torque ratio by inputting a table rotation speed preset corresponding to the throttle opening and the output member rotation speed from the output member rotation speed sensor 8; The table torque ratio from the table torque ratio calculation means 42 and the set torque ratio from the set torque ratio calculation means 45 are input, and when the ratio of the table torque ratio to the set torque ratio is 1 or less, the set torque ratio is set. Is a target torque ratio, and when the ratio is 1 or more, the target torque ratio setting means 43 sets the table torque ratio to the target torque ratio, and the current torque ratio from the current torque ratio detecting means 41 and the target torque ratio setting means. When the ratio of the present torque ratio to the target torque ratio is smaller than a predetermined value smaller than 1, the torque ratio of the continuously variable transmission is input. A downshift signal for increasing is output, an upshift signal for decreasing the torque ratio of the continuously variable transmission is output when the ratio is 1 or more, and the continuously variable transmission is output when the ratio is a predetermined value or more and less than 1. 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 of the device at the current torque ratio.