JP3496102B2 - Automotive clutch control method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch control method for an automobile having an electromagnetic powder clutch. 2. Description of the Related Art Conventionally, an electromagnetic powder clutch 3 provided in an automobile has a magnetic powder 34 between a yoke 32 and a rotor 33 of the clutch as shown in a half sectional view in FIG. When an exciting current is applied, the magnetic powder 34 fastens the yoke 32 and the rotor 33 of the clutch to connect the clutch, and when the exciting current is de-energized, the clutch is released. As shown in the characteristic diagram of FIG. 5, the clutch engagement force is gradually increased by increasing the exciting current. In a vehicle equipped with such an electromagnetic powder clutch 3, when the accelerator is fully depressed and the accelerator pedal is fully accelerated from a steady running state, the exciting current to the electromagnetic powder clutch 3 is made lower than that during the steady running state, and then rapidly rises. As a result, kick down control is performed to increase the engagement force of the electromagnetic powder clutch 3 from that at the time of steady running. Conventionally, this kick down control is performed by the O.D.
If the air conditioner is ON at the time of kick down control, a load is applied to the engine to rotate the air conditioner, and the engine load is increased despite the desire to accelerate the vehicle rapidly. There is a problem that the engine speed is large and the engine speed is poor, so that it takes time until the engine speed increases and acceleration performance deteriorates. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and can improve the acceleration of the engine during kick-down control and improve the acceleration performance. The purpose of the present invention is to provide a clutch control method, the gist of which is to provide an electromagnetic powder clutch in which the fastening force is gradually increased by an increase in the exciting current value. The air conditioner is turned on in the kick-down control in which the exciting current value to the powder clutch is made lower than that during the steady running, and then rapidly increased to supply an exciting current two to three times that of the steady running. In some cases, the rising gradient of the exciting current value is gently controlled over 1.5 to 3 times as long as when the air conditioner is turned off. When the air conditioner is turned on when the accelerator pedal is suddenly depressed from the steady running of the vehicle, the rising gradient of the exciting current supplied to the electromagnetic powder clutch is controlled gently, that is, The excitation current value is increased in a longer time than the kick-down control of, and during this time, the load on the engine is reduced to improve the engine's blow-up, and the engine's blow-up is realized early to accelerate the kick-down performance. Can be improved. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of a control device for a vehicle clutch according to the present invention. In the figure, a control circuit 4 is an electronic control circuit configured using a microcomputer, and includes a microchip computer, a semiconductor memory, an input / output circuit, and the like. The control circuit 4 includes an engine speed sensor 5 for detecting the speed of the engine 1, an accelerator switch 6 for detecting whether or not the accelerator is depressed, a throttle sensor 7 for detecting the 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 outputs a control signal to an exciting current drive circuit 10 of the electromagnetic powder clutch 3 used for the clutch mechanism of the transmission 2. Transmission 2
Is provided with an electromagnetic powder clutch 3 as shown in FIG. 4 in the clutch mechanism. When an exciting current is supplied from the exciting current drive circuit 10 to the electromagnetic powder clutch 3, a yoke 32 and a rotor 33 of the clutch are provided. The magnetic powder 34 sealed in between is coupled by magnetic force to engage the clutch to transmit power. When the exciting current stops, the power is released and the power transmission is stopped. The exciting current drive circuit 10 includes a control circuit 4
When a signal for commanding the start of energizing of the exciting current is input from the controller, the exciting current is applied to the electromagnetic powder clutch 3 and is constituted by 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. The kick-down control performed by the control circuit 4 will be described with reference to FIG. During steady running of the vehicle, a current sufficient to generate a fastening force equivalent to engine torque is supplied to the electromagnetic powder clutch 3. When the driver suddenly depresses the accelerator from this normal running to re-accelerate, P1 When the accelerator pedal is suddenly depressed at this point, the control circuit 4 lowers the exciting current to perform kickdown control than during steady-state running, and then reduces the exciting current value to the electromagnetic powder clutch 3 between P1 and P2 with a steep gradient b. At the point P2, the electromagnetic powder clutch 3 is firmly engaged by the exciting current that is about two to three times that of the steady running to improve the acceleration performance. However, if the vehicle air conditioner is ON when the exciting current rises on this steep gradient, the load on the engine becomes extremely high, the engine blow-up becomes worse, and as a result, rapid acceleration cannot be obtained. . For this reason, in this embodiment, the exciting current value is controlled by increasing the exciting current value at a gentle gradient c from P1 to P3, and the engine load is reduced during the gentle increasing of the exciting current value to increase the engine speed. In the present example, the exciting current is rapidly increased at time t1 in FIG. 3, but in the present example, when the air conditioner is ON, time t2, for example, 1. The exciting current is gradually increased over a long time of about 5 to 3 times. FIG. 2 is a flowchart showing the control performed in the control circuit 4. As shown in FIG. 2, in the kick down control routine (step S1), it is determined in step S2 whether or not the air conditioner is ON. If the air conditioner is ON, the kick down control time, that is, the electromagnetic powder clutch 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 t2 in FIG. On the other hand, when the air conditioner is in the OFF state, in step S4, the exciting current is increased at a steep time t1 which is almost the same as the conventional one, and the electromagnetic powder clutch 3 is firmly engaged early. As shown in FIG. 3, when the accelerator pedal is suddenly depressed and turned on by the driver, the exciting current is supplied to the electromagnetic powder clutch 3 at point P1 instantaneously when the air conditioner is on. Cut, then P1
That is, the exciting current is increased with a gentle rising gradient toward P3 to improve the engine speed. By performing such control, even if the air conditioner is on, the engine can be blown up in the same manner as when the air conditioner is off, and the same acceleration feeling as when the air conditioner is off can be obtained. . According to the present invention, there is provided an electromagnetic powder clutch in which a fastening force is gradually increased by an increase in an exciting current value,
When the vehicle is suddenly depressed from steady running, the value of the exciting current to the electromagnetic powder clutch is made lower than during steady running, and then rapidly increased to 2 to 2 during steady running .
In kick down control that supplies triple the exciting current,
When the air conditioner is turned on, the rising gradient of the exciting current value is gently controlled over a long time 1.5 to 3 times longer than when the air conditioner is turned off. During the control, the time until the electromagnetic powder clutch is tightened is longer than usual, during which the engine blows up well and the air conditioner is turned on
Even in the state, the same acceleration feeling as in the OFF state can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block diagram of a control device for an automobile clutch. FIG. 2 is a flowchart illustrating the content 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 view 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. [Description of Signs] 1 Engine 3 Electromagnetic powder clutch 4 Control circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16D 37/00-37/02 F16D 48/06 B60K 41/00-41/28 F16H 59/00-61 / 12 F16H 61/16-61/24 F16H 63/40-63/48

Claims (1)

(1) An electromagnetic powder clutch which is provided with an electromagnetic powder clutch whose fastening force is gradually increased by an increase in an exciting current value, wherein the electromagnetic powder clutch is provided when an accelerator is suddenly depressed from a steady running state. In the kick-down control for lowering the exciting current value during steady-state running and then rapidly increasing the exciting current to two to three times the steady-state running state, when the air conditioner is ON, the exciting current value The ascending slope,
A method for controlling an automobile clutch, wherein the control is performed gently over 1.5 to 3 times as long as when the air conditioner is off.