JPH0434010B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic gear shift operating device for a synchronized mesh transmission for a vehicle.

Conventionally, for example, in Japanese Patent Application Laid-Open No. 51-121657,
2. Description of the Related Art An automatic gear shift operating device has been proposed which automatically performs a gear shift operation and a clutch mechanism disconnection/connection operation in a synchronous mesh transmission. In the above-mentioned automatic gear shift operation device, when the vehicle is started, the clutch operating position is calculated from the amount of depression of the accelerator pedal and the engine speed, and the clutch mechanism is sequentially moved from the disconnected position, through the half-clutch position, and to the engaged position. The engine now starts smoothly.

By the way, the transmission torque of the dry single-plate clutch mechanism widely used in vehicles increases non-linearly with respect to the stroke of the release lever, as shown by line 30 in FIG. In the second half of the clutch engagement operation, the transmitted torque increases rapidly, causing the vehicle to suddenly accelerate with a shock.

To reduce the impact when connecting the clutch,
It is necessary to engage the clutch slowly, but when downshifting to apply engine braking on a downhill slope, the accelerator pedal is of course in the released position and the transmission is in constant gear. Because they are engaged, if the clutch is engaged too slowly, the vehicle will accelerate while the clutch is disengaged, and engine braking will not be effective.

[Problems to be Solved by the Invention] In view of the above-mentioned problems, an object of the present invention is to control the connecting operation of the clutch actuator in accordance with the stroke, and to control the clutch actuator in the case of a shift-up with a sudden rise in transmission torque. To provide an automatic gear shift operating device in which the clutch is engaged slowly in accordance with the stroke, while the clutch is quickly engaged in the case of downshifting where engine braking is applied.

[Means for solving the problem] In order to achieve the above object, the configuration of the present invention uses an electronic control device to determine the optimum shift position from the amount of depression of the accelerator pedal, the engine speed, and the vehicle speed, and determines the optimum shift position from the current shift position. In an automatic shift operation device that drives a clutch actuator that disengages and engages a clutch and a transmission actuator that performs a shift operation of upshifting or downshifting when the optimum shift position is different, the current shift position detected by a shift position sensor is used. A means for determining the basic operating speed of the clutch actuator in the connection direction based on the position, whether the gear change operation is upshifting or downshifting, and the amount of depression of the accelerator pedal detected by an accelerator sensor, and a means for determining the basic operating speed in the connecting direction of the clutch actuator, and means for determining the optimum operating speed by multiplying the basic operating speed by a preset correction value.

[Function] The basic operating speed of the clutch actuator differs between upshifting from each shift position and downshifting from each shift position, and is determined by the amount of depression of the accelerator pedal.

Furthermore, the operating speed varies with the stroke of the clutch actuator in order to obtain an operating speed that corresponds to the change in transmitted torque as the clutch moves from the disengaged position to the engaged position. That is, the optimum operating speed is determined by multiplying the basic operating speed by a preset correction value corresponding to the stroke of the actuator.

Therefore, the operating speed of the clutch in the connecting direction is initially fast and gradually slows down as the clutch becomes half-engaged, and the clutch is smoothly connected so that the torque transmitted from the engine to the wheels gradually increases. .

[Embodiments of the Invention] As shown in FIG. 2, the automatic gear shift operating device includes a clutch mechanism 2, a clutch actuator 5 that connects and disconnects the clutch mechanism 2, a synchronous mesh transmission 21, and a synchronous mesh transmission 21. The transmission actuator 7 includes a transmission actuator 7 that selects a shift position of the transmission 21, and an electronic control device 10 that controls each actuator 5, 7.

The clutch mechanism 2 applies a spring force via a known pressure plate 2a to a friction plate supported by an input shaft 22 of a synchronous mesh transmission 21 against a flywheel 1a fixed to the crankshaft 1 of the engine. The pressing force of the pressure plate 2a is released by pulling the release lever 3 to the right using the clutch actuator 5.

As shown in FIG. 3, the clutch actuator 5 is constructed by fitting a piston 38 into a cylinder 42 to define oil chambers 40 and 41, and connecting a rod 4 connected to the piston 38 to the release lever 3. It is. A stroke sensor 36 is provided opposite the rod 43 connected to the piston 38. The oil chamber 40 is connected to a discharge port of a hydraulic pump 31 constituting the hydraulic unit 6 via a normally closed electromagnetic on-off valve 33 and a normally open electromagnetic on-off valve 32. Further, the oil chamber 40 is connected to the oil tank 39 via a normally closed electromagnetic on-off valve 35 and a normally open electromagnetic on-off valve 34 which are parallel to each other. Oil chamber 4
1 is directly connected to the oil tank 39.

The normally closed electromagnetic on-off valve 33 is opened only during the gear shifting period, and when the normally open electromagnetic on-off valve 34 is closed, pressure oil from the hydraulic pump 31 is supplied to the oil chamber 40, and the piston 38 moves to the right. Shut off the clutch. On the other hand, when the normally closed electromagnetic on-off valve 35 is closed and the normally open electromagnetic on-off valve 34 is opened and closed intermittently, the oil pressure in the oil chamber 40 is gradually released, the piston 38 moves to the left, and the clutch is connected. . The operating speed of the clutch actuator 5 is controlled by the duty ratio of the pulse voltage applied to the normally closed electromagnetic on-off valve 34.

As shown in FIG. 2, the transmission actuator 7
Actually, it is composed of a hydraulic actuator that performs a select operation and a hydraulic actuator that performs a shift operation in an ordinary manual synchronized mesh transmission, and the shift position is detected by a shift position sensor 8.

When driving on a normal flat road, the electronic control unit 10 (described later) determines the optimum shift position based on the amount of depression of the accelerator pedal, the engine speed, and the vehicle speed.If the current shift position and the optimum shift position differ, the clutch actuation The clutch disengagement/engagement operation by the yuator and the gear change operation of upshifting or downshifting by the transmission actuator are automatically performed.

In preparation for hill driving or reversing that requires engine braking, use the select lever 13 to select N (neutral position), D (all automatic gears), (1st gear),
(2nd gear), (1st, 2nd, 3rd gear automatic shifting), R
A driving mode can be selected for each range (reverse), and the driving mode is detected by the select switch 14. Such a configuration is well known in Japanese Patent Application Laid-open No. 121657/1983, and is not directly related to the gist of the present invention, so a description thereof will be omitted.

The electronic control device 10 is composed of a microprocessor 12, a memory 11, and an interface 9.
The status of each operating section, which will be described later, is input to the interface 9 as a digital signal. A digital signal calculated by the microprocessor 12 is transmitted to the clutch actuator 5 based on the input signal regarding the state of each operating part and the control value stored in the memory 11.
is applied to the transmission actuator 7.

In order to detect the state of each operating part, an electromagnetic pick-up type rotation speed sensor 24 is installed on the outer circumferential side of the flywheel 1a of the engine, and a similar rotation speed sensor 23 is installed on the input shaft 22 of the synchronous mesh transmission 21, and an output Axis 2
0, an accelerator sensor 15 for detecting the amount of depression of the accelerator pedal 16, and a brake sensor 17 for the brake pedal 18.

As shown in FIG. 4, the ROM of the memory 11 stores in advance the control value (operating speed) of the clutch actuator 5 corresponding to the amount of depression of the accelerator pedal 16 as a control map, and uses the detection signal of the shift position sensor 8 as a control value. Find the corresponding control value from the control map. In other words, the solid line in Fig. 4 indicates the start (first gear).
Similarly, the solid lines , , and , respectively indicate the operating speeds of the clutch actuator 5 when the gears are in the second, third, and fourth gear positions. The lower the gear, the more slowly the clutch is engaged to reduce the impact when the clutch is engaged.

Each solid line ~ in Figure 4 is the normal driving mode (D
The operating speed of the clutch actuator 5 when shifting up from each shift position in the range) is shown, and the operating speed of the clutch actuator 5 when shifting down from each shift position is indicated by broken lines ~ in Fig. 4. As shown, unlike the case of upshifting, the operating speed of the clutch actuator 5 is faster.

The operating speed of the clutch actuator 5 corresponding to each shift position shown in FIG.
This is the basis determined by the amount of depression in step 6.
In order to obtain an operating speed that corresponds to the change in transmitted torque as the clutch moves from the disengaged position to the engaged position, as indicated by line 30 in FIG.
The operating speed is changed according to the stroke of the clutch actuator 5 using the correction map shown in .

That is, in the process from the clutch disengagement position to the engagement position, the clutch actuator 5 is initially driven at an operating speed four times the control value read out from the control map shown in FIG. As the speed increases, the operating speed is gradually slowed down, just as if it were operated manually by a skilled driver.
The clutch is connected so that the torque transmitted from the engine to the wheels gradually increases. The above-mentioned correction map indicated by line 28 is appropriately set for each driving mode.

FIG. 6 shows a flowchart of the control program described above. In the figure, p11 to p29 indicate each step of the flowchart. At the same time as the engine starts, the calculation part is p11
, input the signal of the vehicle speed sensor 19 at p12,
At p13, a signal from the accelerator sensor 15 that detects the amount of depression of the accelerator pedal 16 is input, and at p14, a signal from the stroke sensor 36 corresponding to the stroke of the clutch actuator 5 is input.

Input the signal of shift position sensor 8 in p15, and in p16
Input the signal of the select switch 14 of the select lever 13 with p17, and input the vehicle speed and accelerator pedal 16 with p17.
Find the optimum shift position (gear stage) from the amount of depression.

At p18, it is determined whether the shift position is at the optimum shift position. If the shift position is at the optimum shift position, it is determined at p23 whether or not the clutch is disengaged based on the signal from the stroke sensor 36 of the clutch actuator 5. If the clutch is not disconnected, proceed to p29 and end. Also, if the clutch is disconnected, proceed to p24.

If the gear shift position is not at the optimum shift position in p18, the clutch is disengaged in p19, and the synchronized mesh transmission 21 is operated by operating the transmission actuator 7 in p20.
Disengage the gears, select a new shift position with p21, and shift to the new shift position with p22 to achieve gear engagement.

At p24, the shift position is stored in the register A based on the signal from the shift position sensor 8. At p28, it is determined whether the driving mode is in the D range based on the signal from the select switch 14. If the driving mode is in the D range, proceed to p27; if it is not in the D range, proceed to p26 to store the contents previously stored in register A plus 5.

In p27, the basic operating speed of the clutch actuator 5 corresponding to the amount of depression of the accelerator pedal 16 is determined using the register A as a parameter from the control map (Fig. 4) stored in the memory, and the stroke of the clutch actuator 5 is determined. Find the correction coefficient corresponding to from the control map (Figure 5), find the optimal operating speed from the product of the basic operating speed and the correction coefficient,
Connect the clutch at the optimum operating speed using p28. The above program is repeated at predetermined time intervals to complete the gear shifting operation.

[Effects of the Invention] The present invention includes a shift position sensor that detects the current shift position, and a means for determining the optimum operating speed by multiplying the basic operating speed by a correction value set in advance corresponding to the stroke of the actuator. Since the clutch actuator operating speed is not only selected based on whether to shift up or down from each gear position of the transmission, it is also pre-compensated in accordance with the clutch actuator stroke. Since the speed is controlled, smooth engagement of the clutch without shock can be achieved.

In other words, during start-up or speed-up operation where the transmission torque rises abruptly, a gentle rise in the transmission torque can be obtained by adjusting the engagement of the clutch according to the stroke.

The operating speed of the clutch actuator is set so that it operates quickly during upshifting from a high gear position, so that quick engagement of the clutch is achieved.

The operating speed of the clutch actuator is set so that the latter operates faster in upshifting and downshifting from each shift position, so that engine braking by deceleration operation can be effectively applied.

[Brief explanation of drawings]

Figure 1 is a diagram showing the operating characteristics of the clutch mechanism.
Fig. 2 is a schematic configuration diagram of the automatic transmission operating device according to the present invention, Fig. 3 is a hydraulic circuit diagram of the clutch actuator of the same device, and Fig. 4 is a control map for controlling the basic operating speed of the clutch actuator. FIG. 5 is a diagram showing a correction map for correcting the operating speed of the clutch actuator, and FIG. 6 is a flowchart explaining software for controlling the clutch actuator. 2: Clutch mechanism, 3: Release lever, 5:
Clutch actuator, 6: Hydraulic unit,
7: Transmission actuator, 8: Shift position sensor, 10: Electronic control unit, 13: Select lever, 14: Select switch, 15: Accelerator sensor, 17: Brake sensor, 19: Vehicle speed sensor, 21: Synchronous mesh transmission , 23: rotation speed sensor, 24: engine rotation speed sensor, 36: stroke sensor.

Claims (1)

[Claims] 1 The electronic control device determines the optimal shift position from the amount of depression of the accelerator pedal, engine speed, and vehicle speed.
In an automatic shift operation device that drives a clutch actuator that disconnects and engages a clutch and a transmission actuator that performs a shift operation of upshifting or downshifting when the current shift position and the optimum shift position are different, a shift position sensor is used. Means for determining the basic operating speed of the clutch actuator in the connection direction based on the detected current shift position, whether the shift operation is upshift or downshift, and the amount of depression of the accelerator pedal detected by the accelerator sensor; An automatic gear shift operating device comprising: means for multiplying the basic operating speed by a correction value set in advance corresponding to a stroke to obtain an optimum operating speed.