JPS6229431A - Clutch control device for car - Google Patents

Abstract

PURPOSE:To make it possible to start in a creeping running, by maintaining the clutch connection in a half clutch condition when it is detected that the pressing amount of the accelerator is less than a specific value from the condition where the stop of the rotation is detected by a rotation speed detecting device. CONSTITUTION:To the MPU 1 are input detected signals of a stroke sensor 4 to detect the pressing of the accelerator pedal 3, a rotation speed detecting sensor 7 to detect the rotation speed of a propeller shaft, a transmission position sensor 11, and an engine rotation speed sensor 13. When the output of the rotation speed sensor 7 detects the car is stopped, and the output of the stroke sensor 4 detects that the pressing amount of the accelerator pedal 3 is less than a specific value in the MPU 1, the clutch 8 is kept in a half clutch where the clutch 8 is met sliding, by controlling an electromagnetic valve 10 to drive and control a clutch actuater 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a clutch control device for an automobile equipped with a mechanical automatic transmission that is capable of creep operation in which the vehicle travels at a slow speed.

[Conventional technology]

Currently, the most commonly used automatic transmission for automobiles is a hydraulic type using a torque converter, and is combined with a 3- to 4-speed planetary gear type auxiliary transmission. Structurally, this fluid-type automatic transmission always transmits the engine's driving torque to the drive shaft, and when the lever is in the drive position or reverse position, the vehicle can move at a slow speed without pressing the accelerator pedal. creep). Therefore, if the lever is new 1-
The brake pedal must be depressed at all times to keep the vehicle stopped when not in the parking or park position. However, this creep makes it easy to drive at very low speeds when parking a car in a garage, so it is used as a very convenient mechanism.

On the other hand, conventional hydraulic automatic transmissions are structurally unavoidable in terms of fuel consumption, which is lower than that of manually operated transmissions, and various improvements are currently being made.

As a solution to this problem, a mechanism for automating the conventional manually operated mechanical transmission is now in practical use. This mechanical automatic transmission automatically engages and disconnects clutches and changes gears, and has the feature of being able to approximate the operation of a conventional manually operated transmission.

In other words, the clutch is completely disengaged when stopped, and fully engaged when driving, which avoids the slipping condition that occurs with hydraulic automatic transmissions and lowers the fuel consumption rate compared to manual transmissions. It can be improved to the same level.

However, such a mechanical automatic transmission is structurally similar to a hydraulic automatic transmission and is inconvenient for leap driving. That is, in a normal mechanical automatic transmission, the clutch is automatically connected when the accelerator is depressed at the time of starting, so it is difficult to adjust the speed when performing creep driving.

Therefore, in order to creep a car equipped with a conventional mechanical automatic transmission, a manual creep mode setting means is provided, and this setting operation controls the clutch to be in a half-clutch state and keeps the engine speed constant. A mechanism had to be provided to control the engagement and disconnection of the clutch.

[Problem that the invention seeks to solve]

However, in such conventional mechanical automatic transmissions, in order to prevent the clutch from seizing up due to the clutch remaining in a partially engaged state for a long period of time, creep mode is automatically canceled after a predetermined period of time has elapsed. There is.

Therefore, when creep mode is canceled, if you want to set creep mode again, you will have to perform the operation each time, and before creep mode is automatically canceled, normal gear shifting operation will resume. When you want to do this, you have to manually cancel the settings, which poses a problem with operability.

The present invention solves these conventional problems,
An object of the present invention is to provide a clutch control device for an automobile that allows an automobile equipped with a mechanical automatic transmission to perform creep driving by normal accelerator operation.

[Means for solving problems]

The present invention includes a rotational speed detection means for detecting the rotational speed of the output shaft of a transmission, an accelerator detection means for detecting the amount of accelerator depression, and an output of the rotational speed detection means and the accelerator detection means. and a control means for controlling the contact state of the clutch so that the rotation speed changes gradually, the control means changing the state from the state in which the rotation speed detection means detects rotation stoppage to the state in which the rotation speed detecting means detects rotation stoppage. The present invention is characterized in that it includes means for maintaining the contact state of the clutch in a half-clutch state when the accelerator detection means detects that the accelerator depression amount is less than or equal to a predetermined value.

[For production]

The present invention performs automatic control to maintain the clutch engagement state in a half-clutch state as long as the amount of accelerator depression is below a predetermined value and within a predetermined time period after the accelerator is depressed. Creep running can be easily made possible.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 1, a stroke sensor 4 for detecting the amount of depression of an accelerator pedal 3 is connected to a microprocessor l via an input/output control device 2.
, a rotational speed detection sensor 7 that detects the rotational speed of the output shaft 6 of the mechanical automatic transmission 5, and a solenoid valve 10 that drives and controls an actuator 9 that connects and disconnects the clutch 8.

Furthermore, a transmission position sensor 1) that detects the gear position of the mechanical automatic transmission 5, a rotation speed sensor 13 that detects the rotation speed of the engine 12, and an injection pump 14 that is linked to the accelerator pedal 3 are also connected. Ru. A mechanism for switching gears of the automatic transmission 5 is omitted in the drawing.

Normally, when the clutch 8 is engaged or disengaged, the microprocessor 1 inputs the amount of depression of the accelerator pedal 3 detected by the stroke sensor 4 and the rotation speed information of the output shaft 6 detected by the rotation speed detection sensor 7, and inputs the rotation speed of the output shaft 6. The connection state of the clutch 8 is controlled so that the speed changes slowly.

The feature of the present invention is that the microprocessor 1 detects when the rotation speed detection sensor 7 detects rotation stoppage, and when the stroke sensor 4 detects the amount of depression of the accelerator pedal 3 which is less than a predetermined value. When this is detected, the clutch is automatically controlled to maintain a half-clutch state where the clutch slips and engages.

Here, when the amount of depression of the accelerator pedal 3 continues to be less than a predetermined value until it reaches a predetermined value or more, the clutch 8 is brought into the engaged state to prevent the clutch 8 from seizing.

FIG. 2 is a flowchart illustrating the operation of the apparatus according to the embodiment of the present invention.

The microprocessor 1 reads the amount of depression of the accelerator pedal 3 from the stroke sensor 4, sets a timer when the value changes from zero to a positive value, and sets the timer value when the amount of depression is less than a predetermined value. When the read value is less than a predetermined value, the clutch is controlled to be held in a half-clutch state.

When the timer value exceeds a predetermined value, the clutch 8 is connected to prevent the clutch 8 from seizing.

When the amount of depression of the accelerator pedal 3 becomes zero, the timer is reset and the clutch 8 is disengaged.

Normally, when performing creep driving, the accelerator pedal 3
The amount of depression is small, and the clutch 8 is held in a half-clutch state to enable slow speed running because the pedal, key pedal (not shown), and accelerator pedal 3 are appropriately depressed. That is, by slightly depressing the accelerator pedal 3 when the vehicle is stopped, the clutch 8 is controlled to a half-clutch state, and by moderately switching between depressing the accelerator pedal 3 and the brake pedal, the timer is reset and the clutch 8 is controlled to a half-clutch state. 8 is in the disengaged state, and when the accelerator pedal 3 is depressed again, the clutch is controlled to be in a half-clutch state, thereby easily causing the vehicle to creep.

Further, when the accelerator pedal 3 is continuously depressed for a predetermined period of time or more, the clutch 8 is automatically connected. The operator senses the engagement state of the clutch 8 and stops depressing the accelerator pedal 3, thereby resetting the timer and disengaging the clutch 8. Thereafter, by similarly operating the accelerator pedal 3, the connection state of the clutch 8 can be controlled to cause the vehicle to creep.

〔Effect of the invention〕

As explained above, according to the present invention, since the clutch is held in a half-clutch state depending on the depression of the accelerator pedal, the vehicle can be driven in a creeping manner. If a timer is provided, the elapsed time of the half-clutch state is detected and it prevents burn-in caused by long-term mtE, thereby making it possible to safely perform creep even in mechanical automatic transmissions.

Therefore, by appropriately repeating slight depression of the accelerator pedal, it is possible to easily and safely cause the vehicle to creep. That is, in the present invention, the conventional manual creep mode setting operation is changed to an accelerator pedal operation, which has the effect of improving operability during traffic jams where the creep mode is repeated.

In addition, in cars equipped with normal diesel engines,
Since the accelerator pedal is fully depressed when starting or accelerating, it can be clearly distinguished from the operation of the accelerator pedal for creep driving, so there is no problem with operability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a flowchart explaining the operation of the apparatus according to the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Microprocessor, 2... Human output control device, 3... Accelerator pedal, 4... Stroke sensor, 5... Mechanical automatic transmission, 6... Output shaft, 7...
・Rotational speed detection sensor, 8... Franchise, 9... Actuator, 10... Solenoid valve, 1)... Transmission position sensor, 12... Engine, 13...
- Rotation speed sensor, 14...injection pump. Agent: Patent Attorney Naotaka Ide, Satsuki 2
surface

Claims (1)

[Claims] (1) A rotational speed detection means for detecting the rotational speed of the output shaft of the transmission; an accelerator detection means for detecting the amount of accelerator depression; and a control means for controlling a contact state of the clutch so that the speed changes gradually, wherein the control means changes the accelerator from a state in which the rotational speed detection means detects rotation stoppage. 1. A clutch control device for an automobile, comprising means for maintaining a clutch contact state in a half-clutch state when the detection means detects an accelerator depression amount that is less than or equal to a predetermined value. (2) The control means includes means for counting the elapsed time during which the clutch is held in the half-clutch state, and means for releasing the half-clutch state when the counted value is equal to or greater than a predetermined value. 1) The automobile clutch control device according to item 1).