JPH08219189A - Control method of cloutch for automobile - Google Patents

Abstract

PURPOSE: To improve acceleration properties by gently controlling the rising gradient of an exciting current value in the operation of an air conditioner by kick down control in the rapid depressing of an accelerator from the normal traveling. CONSTITUTION: Electric current having such the degree as to generate clamping force corresponding to engine torque is supplied to an electromagnetic powder clutch 3 in the normal traveling shown by a letter (a), the exciting current is made lower than that in the normal traveling by a control circuit 4 in order to perform kick down control when an accelerator is rapidly depressed at the P1 point, the exciting current value is rapidly increased between P1 and P2 by the steep gradient, the electromagnetic powder clutch 3 is firmly put in connection, and acceleration properties is improved. When an air conditioner is in the on state, the exciting current value is increased by the gentile gradient (c) from P1 to P3, the load of an engine is decreased during it, and blow-up of the engine is early realized. Accordingly, the acceleration feeling equal to that in the off state can be obtained even if the air conditioner is in the on state.

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 provided in an automobile, magnetic powder 34 exists between a yoke 32 and a rotor 33 of the clutch as shown in a half sectional view in FIG. When an electric current is applied, the magnetic powder 34 engages the yoke 32 and the rotor 33 of the clutch to connect the clutch, and when the exciting current is de-energized, the engagement of the clutch is released. As shown in the characteristic diagram of No. 3, the clutch engagement force can be gradually increased by increasing the exciting current.

In an automobile equipped with such an electromagnetic powder clutch 3, when the accelerator is suddenly depressed from the steady running state to accelerate fully open, the exciting current to the electromagnetic powder clutch 3 is made lower than during the steady running, and then rapidly rises. Then, the kickdown control is performed to increase the engagement force of the electromagnetic powder clutch 3 more than during steady running. In the conventional case, this kickdown control is performed in the air conditioner of the automobile.
Since it is performed regardless of N or OFF, if the air conditioner is in the ON state during kickdown control, the engine load will be applied to rotate the air conditioner, and the engine load will increase even though the vehicle wants to accelerate rapidly. The problem was that the engine was large and the engine did not blow up well, and it took time to blow up the engine and the acceleration performance deteriorated.

[0004]

SUMMARY OF THE INVENTION The present invention has been devised in view of the above-mentioned problems of the prior art, and is a clutch control capable of improving the engine blow-up during kickdown control and improving acceleration performance. The purpose of the present invention is to provide a method, which is provided with an electromagnetic powder clutch in which the fastening force is gradually increased by the increase of the exciting current value, and the electromagnetic powder clutch is applied to the electromagnetic powder clutch when the vehicle suddenly depresses from steady running. In kick-down control that lowers the excitation current value of
When the air conditioner is turned on, the rising gradient of the exciting current value is gently controlled.

[0005]

When the vehicle is in the state where the air conditioner is turned on when the accelerator is suddenly depressed from the steady running, the rising gradient of the exciting current value supplied to the electromagnetic powder clutch is gently controlled, that is, the conventional kickdown. The exciting current value is increased in a longer time than the control, during which the engine load is reduced to improve the engine upswing, the engine upswing is realized early, and the acceleration performance during kickdown is improved. be able to.

[0006]

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 speed sensor 5 for detecting the rotation speed 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. A vehicle speed sensor 8 for detecting a vehicle speed, a shift sensor 9 for detecting a shift position of the transmission 2, and a clutch output side rotation sensor 1 for detecting an output side rotation speed of the clutch 3.
Each output signal such as 1 is 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
4 has the electromagnetic powder clutch 3 as shown in FIG. 4 in its clutch mechanism. When an exciting current is supplied to the electromagnetic powder clutch 3 from the exciting current drive circuit 10, the clutch yoke 32 and the rotor 33 are provided. The magnetic powder 34 enclosed in the space is coupled by magnetic force to engage the clutch to transmit power, and when the exciting current is stopped, the magnetic powder 34 is opened and the power transmission is stopped.

The exciting current drive circuit 10 includes a control circuit 4
When a signal for instructing the start of energization of an 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, a switching element, and the like.

FIG. 3 is a diagram showing the relationship between the exciting current supplied to the electromagnetic powder clutch 3 and time. Kickdown control performed by the control circuit 4 will be supplementarily described with reference to FIG. During steady running, the current is supplied to the electromagnetic powder clutch 3 to generate a fastening force equivalent to the engine torque. When the driver suddenly depresses the accelerator to re-accelerate from this normal running, P1 When the accelerator is suddenly depressed at the point, the control circuit 4 lowers the exciting current to perform kickdown control as compared with that during steady running, and thereafter, during P1 and P2, the exciting current value to the electromagnetic powder clutch 3 is steeply increased. Then, at point P2, the electromagnetic powder clutch 3 is firmly engaged with the exciting current that is about 2 to 3 times as much as that during steady running, and the acceleration performance is improved. However, if the air conditioner of the automobile is in the ON state when the exciting current rises at this steep slope, the load on the engine becomes extremely high and the engine blow-up deteriorates, and as a result, sudden acceleration cannot be obtained. .

Therefore, in this example, the exciting current value is controlled by increasing it with a gentle gradient c extending from P1 to P3, and during this gentle increase of the exciting current value, the load on the engine is reduced and the engine blows up. In the prior art, the exciting current was rapidly increased at the time of t1 in FIG. 3, but in the present example, when the air conditioner is ON, the time of t2, for example, 1. The exciting current is gradually increased over a long time of about 5 to 3 times.

That is, FIG. 2 is a flow chart showing the control performed in the control circuit 4. As shown in FIG. 2, in the kickdown control routine (step S1), it is determined in step S2 whether or not the air conditioner is ON. When the air conditioner is ON, the kickdown control time, that is, the electromagnetic powder clutch is determined. The rising time of the exciting current supplied to No. 3 is set in step S3 for turning on the air conditioner, and the exciting current value is increased with a gentle gradient for a long time of t2 in FIG. On the other hand, when the air conditioner is off, in step S4, the exciting current is increased at a time t1 of a steep gradient almost equal to that in the conventional case, and the electromagnetic powder clutch 3 is fastened firmly early.

As shown in FIG. 3, when the driver rapidly depresses the accelerator pedal to turn it on, the exciting current is instantaneously supplied to the electromagnetic powder clutch 3 at point P1 when the air conditioner is on. Cut, then P1
The exciting current is increased with a gentle increase gradient toward .about.P3 to improve the engine blow-up. By controlling in this way, even if the air conditioner is on, the engine blow-up can be obtained as in the case where the air conditioner is off, and the same acceleration feeling as when the air conditioner is off can be obtained. .

[0014]

The present invention is provided with an electromagnetic powder clutch in which the fastening force is gradually increased by increasing the exciting current value,
When the air conditioner is turned on in kick down control in which the exciting current value to the electromagnetic powder clutch is made lower than that in steady running when the accelerator is suddenly depressed from steady running and then rapidly increases, the exciting current value is Since it was decided to gently control the ascending slope of the air conditioner, when the air conditioner is turned on, the time until the electromagnetic powder clutch is closed becomes longer than usual during kickdown control, during which time the engine blows up well and the air conditioner turns on. Even in the ON state, the same acceleration feeling as in the OFF state can be obtained.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing the contents of kickdown control.

FIG. 3 is a diagram showing a relationship between an exciting current to a clutch and an exciting time.

FIG. 4 is a half sectional configuration diagram of an electromagnetic powder clutch.

FIG. 5 is a characteristic diagram showing an example of a correlation between an exciting current of an electromagnetic powder clutch and a fastening force.

[Explanation of symbols]

 1 Engine 3 Electromagnetic powder clutch 4 Control circuit

Claims (1)

[Claims] 1. An electromagnetic powder clutch, the engagement force of which is gradually increased by the increase of the exciting current value, is provided, and when the automobile is suddenly depressed from steady running, the exciting current value to the electromagnetic powder clutch is steady running. In a kick-down control in which the air-conditioner is turned on in a kick-down control in which the temperature is further lowered and then sharply rises, a control method for an automobile clutch is characterized in that a rising gradient of the exciting current value is gently controlled.