JPH0488218A - Starting control method of clutch type automatic transmission - Google Patents

Abstract

PURPOSE:To start a vehicle with high responsiveness by operating an accelerator pedal under a condition that an engine is idly rotated, a proceeding/retreating lever is set to a neutral position, and the vehicle is stopped, and by disconnecting a clutch when an engine speed reaches a specified value. CONSTITUTION:When an accelerating pedal is operated for shift starting under a condition that an engine is idly rotated, a proceeding/retreating switching gear is set neutral, and a vehicle is stopped, an increased engine speed is detected by an engine speed sensor 2 and input to a CPU 6. The CPU 6 outputs a signal to an actuator driving circuit 10 for operating it when the engine speed reaches a predetermined value based on memorized data, bringing about disconnection of a clutch by means of an actuator 11 for clutch. In case that the proceeding/retreating clutch is switched, a gear is shifted at once since the clutch is disconnected. Afterward, the clutch is connected by the actuator 11 and the vehicle is started. The engine speed is set slightly higher than the idling engine speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oscillation control method for a clutch type automatic transmission.

[Conventional technology]

To start a shift in a clutch-type automatic transmission, (1) depressing the accelerator pedal, (2) turning the forward/reverse selector lever into forward or reverse, (3) disengaging the clutch, (4) shifting the forward/reverse gear, (5) engaging the clutch. done in order. Note that (3) to (5) in this case are automatically performed.

[Problem to be solved by the invention]

In the conventional start control method described above, if the clutch is disengaged in (3) after the forward/reverse switching lever is moved from forward to reverse in (2), a time lag occurs when the gear shift starts at this time. This gives the operator a bad feeling about the responsiveness at this time.

The present invention has been made in view of the above, and is a method for controlling the start of a clutch-type automatic transmission so that the shift start of the clutch-type automatic transmission can be started with good responsiveness and the operator does not feel a time lag. The purpose is to provide the following.

[Means to solve the problem]

In order to achieve the above object, the oscillation control method for a clutch type automatic transmission according to the present invention includes a vehicle speed detection means, an engine rotation speed detection means, an accelerator pedal stroke detection means, a forward/reverse gear stroke detection means, 1st/2nd gear stroke detection means, a central processing unit that receives signals from each of the detection means, retrieves data from a storage device, processes it, and converts it into an output signal; In a clutch type automatic transmission consisting of an actuator drive means controlled by the actuator, and actuators for a clutch, a forward/reverse gear shift, and a 1st/2nd gear shift operated by the actuator drive, the accelerator pedal is depressed. When the vehicle is stopped, the engine is idling, the forward/reverse lever is in neutral, and the vehicle is stopped, then the accelerator pedal is depressed, and then the forward/reverse lever is placed in forward or reverse to shift and start the vehicle. , when the accelerator pedal is depressed and the engine speed rises to a certain value, the clutch is released.

[For production]

When the accelerator pedal is pressed during a shift start and the engine speed reaches N or a certain value N, the clutch is disengaged in response to the signal at this time, and the clutch is disengaged before the forward/reverse switching lever is switched, causing the forward/reverse shift to take place. When the lever is switched, the forward and reverse gears are immediately shifted.

〔Example〕

Embodiments of the present invention will be described in %s based on the drawings.

FIG. 2 is a block diagram showing the control system of a clutch type automatic transmission. In this diagram, 1 is a vehicle speed detection sensor that detects the vehicle speed, 2 is an engine rotation speed detection sensor that detects the engine rotation speed, and 3 is a An accelerator pedal stroke detection sensor detects the amount of depression of the accelerator pedal; 4 is a forward/reverse gear stroke detection sensor that detects the switching stroke between forward and reverse gears; 5 is a 1st/2nd speed gear stroke detection sensor that detects the switching stroke between 1st gear and 2nd gear. This is a 2nd gear stroke detection sensor.

Among the detection signals from each of the above-mentioned detection sensors, the detection signals from the vehicle speed detection sensor 1 and the engine rotation speed detection sensor 2 are directly input to the CPU (central processing unit) 6, and the detection signals from the other detection sensors are input to the A/ The signal is A/D converted by a D converter 7 and then input to the CPU 6. 8 is R
This ROM 8 is an OM (memory device) and is configured to input a predetermined signal to the CPU 6 when the engine rotation speed N reaches a predetermined rotation speed N. 9 is CPU
11 is a clutch actuator, 12 is a forward/reverse gear shift actuator, and 13 is a 1st/2nd gear shift actuator. Yes, these actuators are actuator drive circuit 1
The drive is controlled at 0.

In the above-mentioned control system, when the vehicle speed increases by depressing the accelerator pedal and reaches a predetermined vehicle speed N, the clutch disengagement->transmission gear shift-clutch engagement operation is automatically performed.

The control method of the present invention will be explained based on the flowchart shown in FIG. 1 and the block diagram shown in FIG. 2.

To shift and start when the engine is idling, the forward/reverse selector lever is in neutral, and the vehicle is stopped,
First, when the accelerator pedal is depressed (step 1), the engine speed N increases. This engine rotation speed N is constantly detected by an engine rotation speed detection sensor 2 and inputted to the CPU 6.

When the CPU 6 retrieves the data stored in the ROM 7 and reaches the engine speed N or a predetermined speed N1 (step 2), it outputs a signal to the actuator drive circuit 10 to operate it, and the clutch actuator 11 Disengage the clutch (step 3).

Next, when the forward/reverse switching lever is switched (step 4), since the clutch has already been disengaged, the shift is immediately made to the forward/reverse gear shift (step 5).

Thereafter, the clutch is engaged by the clutch actuator 11 (step 6), and the vehicle is started.

The preset engine rotational speed N1 is set to a slightly higher rotational speed than the idling rotational speed so as to avoid timing such that the forward/reverse switching lever is switched while the accelerator pedal is being depressed.

〔Effect of the invention〕

According to the present invention, when starting by shifting a clutch-type automatic transmission, the clutch is already disengaged before switching the forward/reverse switching lever, so the shift can be immediately shifted to the forward/reverse gear, resulting in an extremely responsive start. This eliminates the need for operators to experience time lag.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a flowchart, and FIG. 2 is a block diagram showing a control system. 1 is a vehicle speed detection sensor, 2 is an engine rotation speed detection sensor,
3 is an accelerator pedal stroke detection sensor, 4 is a forward/reverse gear stroke detection sensor, 5 is a 1st/2nd gear stroke detection sensor, 6 is a CPU, 8 is a ROM, 10 is an actuator drive circuit, 11 is a clutch actuator,
12 is an actuator for forward/reverse gear shift, 13 is 1st speed/
Actuator for 2-speed gear shift.

Claims (1)

[Claims] A vehicle speed detection means, an engine rotation speed detection means, an accelerator pedal stroke detection means, a forward/reverse gear stroke detection means, a 1st/2nd gear stroke extraction means, and a memory device upon receiving the signals from the detection means. A central processing unit that takes out data, processes it, and converts it into an output signal, an actuator drive means that is controlled based on the output signal from this central processing unit, and a clutch and a forward/reverse gear shift operated by this actuator drive means. , in a clutch-type automatic transmission consisting of actuators for 1st and 2nd gear shift, when the accelerator pedal is not depressed, the engine is idling, the forward/reverse lever is in neutral, and the vehicle is stopped. The system is characterized in that when the accelerator pedal is depressed and the forward/reverse lever is then turned from forward to reverse to start the vehicle, the clutch is disengaged when the accelerator pedal is depressed and the engine speed rises to a certain value. Oscillation control method for clutch type automatic transmission.