JPH06159400A - Control method of automobile clutch - Google Patents

Abstract

PURPOSE:To provide the control method of an automobile clutch by which the burning of the clutch can be prevented. CONSTITUTION:In the case of an automobile equipped with an electromagnetic powder clutch whose coupling force is strengthened by the rise of a magnetizing electric current, control is conducted by means of a control circuit 4 so that the magnetizing electric current may be made to rise up gradually, in a case in which the conditions of a shift position being in an advance or retreat position and a brake being started and an accelerator being stepped on and the automobile being in an approximate stop state are materialized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling a clutch in an automobile equipped with an electromagnetic powder clutch.

[0002]

2. Description of the Related Art Conventionally, in an electromagnetic powder clutch 3 as shown in FIG. 3 provided in an automobile, magnetic powder 34 exists between a yoke 32 and a rotor 33 of the clutch, and an exciting current is applied to a coil 31. Magnetic powder 3
4 connects the clutch 32 and the rotor 33 to connect the clutch, and when the exciting current is de-energized, the clutch is disengaged. By increasing the exciting current, the characteristics of FIG. As shown in the figure, the clutch magnetic powder 34 has a structure capable of gradually increasing the fastening force. However, conventionally, the intensity of the exciting current is set to a substantially constant value, and the exciting current is configured to be supplied enough to directly connect the clutch. In an automobile equipped with such an electromagnetic powder clutch 3, for example, if the accelerator is continuously depressed with the side brake or the foot brake of the automobile being applied,
There was a problem that the clutch continued to slip and eventually the clutch burned.

[0003]

SUMMARY OF THE INVENTION The present invention was devised in view of the above-mentioned problems of the prior art, and an object thereof is not to provide a method of controlling a clutch for an automobile capable of preventing the clutch from burning. The gist is that in a vehicle equipped with an electromagnetic powder clutch in which the fastening force is strengthened by the increase of the exciting current, the shift position is in the forward position or the backward position,
When the condition that the brake is applied, the accelerator is stepped on, and the vehicle is in a substantially stopped state is satisfied, the exciting current is controlled to be gradually increased.

[0004]

When the accelerator is stepped on while the side brake or the foot brake of the automobile is applied, the control device controls the exciting current supplied to the electromagnetic powder clutch to gradually increase. The fastening force between the yoke and rotor of the clutch is gradually strengthened, and the clutch fastening force is strengthened to reduce clutch slippage, eventually causing the engine to stop because it cannot bear the load, which causes the clutch to burn. Can be prevented.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of a vehicle clutch control device according to the present invention. In the figure, a control circuit 4 is an electronic control circuit configured by using a microcomputer, and is configured by a microchip computer, a semiconductor memory, an input / output circuit and the like.

The control circuit 4 includes an engine rotation sensor 5 for detecting the number of revolutions of the engine 1, an accelerator switch 6 for detecting whether or not the accelerator is depressed, a throttle sensor 7 for detecting a throttle valve opening, and a vehicle speed. A vehicle speed sensor 8 for detecting the vehicle speed, a shift sensor 9 for detecting the shift position of the transmission 2, and a brake switch 12 for detecting whether or not the driver is stepping on the brakes.
The output signals of the side brake switch 14 for detecting whether or not the side brake is applied, and the clutch output side rotation sensor 11 for detecting the output side rotation speed of the clutch 3 are input.

The control circuit 4 also outputs a control signal to the exciting current drive circuit 10 for the electromagnetic powder clutch 3 used in the clutch mechanism of the transmission 2. Transmission 2
The electromagnetic powder clutch 3 shown in FIG. 3 is provided in the clutch mechanism, and when the electromagnetic powder clutch 3 is supplied with the exciting current from the exciting current drive circuit 10, the clutch yoke 32 and the rotor are provided. Magnetic powder 34 enclosed between 33 is coupled by magnetic force to fasten the clutch yoke 32 and the rotor 33 to transmit power, and when the exciting current is stopped, the magnetic powder 34 is opened to stop power transmission. .

The exciting current drive circuit 10 includes a control circuit 4
When a signal for instructing the start of energization of the exciting current is input from the device, the exciting current is energized to the electromagnetic powder clutch 3, and is composed of a relay circuit and a switching element.

FIG. 2 is a flow chart showing the contents of the control according to the present invention among the controls executed in the control circuit 4. Below, based on the flow chart shown in FIG.
The clutch control will be described. In FIG. 2, it is determined in step S1 whether or not the vehicle is stopped. That is,
When the vehicle is almost in the stopped state according to the detection signal of the vehicle speed sensor 8, it is determined in the next step S2 whether the side brake switch 14 is ON. That is, it is determined whether or not the driver has applied the side brakes.
When the side brake is not applied, it is determined in the next step S3 whether or not the foot brake switch is turned on. That is, it is determined whether or not the driver has stepped on the foot brake. When the foot brake is stepped on or the side brake is applied, it is determined in the next step S4 whether or not the accelerator is turned on. That is, it is determined whether or not the accelerator switch 6 is depressed by the driver. When it is determined that the accelerator is depressed, in the next step S5, the control circuit 4 causes the exciting current supplied from the exciting current drive circuit 10 to the electromagnetic powder clutch 3 to gradually increase and output. The signal is output to the drive circuit 10.

As a result, the exciting current gradually increases, and the engaging force of the electromagnetic powder clutch 3 gradually increases (see the characteristic diagram of FIG. 4). Although the slippage of the clutch 3 is reduced by increasing the engagement force, the load on the engine side is correspondingly increased, and the engine eventually stops. When the state of steps S1, S2, S3 and S4 is changed to the opposite state while the clutch current value is gradually increasing in step S5, the increase of the clutch current is stopped. Has been
In step S6, the control is switched to normal control. The control, for example, when the driver applies the foot brake or the side brake, when the driver depresses the accelerator, the clutch continues to slip and the clutch burns. It tries to prevent the clutch from burning by pushing the engine to a stopped state.

[0011]

As described above, the vehicle clutch control method according to the present invention is applied to a vehicle equipped with an electromagnetic powder clutch in which the engaging force is increased by increasing the exciting current, and the brake is applied when the shift position is the forward position or the reverse position. When the condition that the accelerator is stepped on and the vehicle is almost stopped is established, the excitation current is controlled to be gradually increased, so that the driver brakes such as a foot brake or a side brake. When the driver keeps stepping on the accelerator in the state where the vehicle is on, the engaging force of the clutch is strengthened, which brings the engine into a stopped state and effectively prevents the clutch from burning.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a clutch control device.

FIG. 2 is a flowchart showing an outline of control contents.

FIG. 3 is a half sectional configuration diagram of an electromagnetic powder clutch.

FIG. 4 is a characteristic diagram showing an example of characteristics of an electromagnetic powder clutch.

[Explanation of symbols]

 1 Engine 3 Electromagnetic Powder Clutch 4 Control Circuit 6 Accelerator Switch 8 Vehicle Speed Sensor 10 Excitation Current Drive Circuit 12 Foot Brake Switch 14 Side Brake Switch

Claims (1)

[Claims] 1. An automobile equipped with an electromagnetic powder clutch in which a fastening force is increased by increasing an exciting current, the shift position is in a forward position or a backward position, a brake is applied, and an accelerator is stepped on. A method for controlling an automobile clutch, characterized in that the excitation current is controlled so as to be gradually increased when a condition of being in a substantially stopped state is satisfied.