JPH03213730A - Automobile clutch start control device - Google Patents

Abstract

PURPOSE:To obtain rising action to the optimum engine speed by changing the exciting current applying time to a powder clutch according to the detected throttle valve opening at the time of discriminating the start of an automobile. CONSTITUTION:A control circuit 4 discriminates whether or not an automobile is at the start time on the basis of the output signals of an accelerator switch 6, a vehicle speed sensor 8 and a shift position sensor 9. Upon discrimination of the start, time until the application of an exciting current to the powder clutch 3 of a transmission 2 is delayed according to the throttle valve opening detected by a throttle sensor 7. After the delay time, an exciting current on-off circuit 10 is turned on to start current application to the power clutch 3 through an exciting circuit 11 to lock it. Rising action to the optimum engine speed according to any throttle valve opening degree can be thus obtained.

Description

Detailed Description of the Invention (Industrial Application Field) This invention improves the engine speed at the time of starting by changing the start time of energizing the electromagnetic powder clutch according to the opening degree of the throttle valve when the car starts. The present invention relates to a start control device for an automobile clutch that appropriately increases the rotation of the clutch.

(Prior Art) Conventionally, it has been proposed to use an electromagnetic powder clutch in a clutch mechanism in an automobile transmission. In this electromagnetic powder clutch, when an excitation current is applied, magnetic powder sealed between the clutch plates is magnetized and coupled, thereby tightening the clutch plates and transmitting power.

If the electromagnetic powder clutch is engaged immediately when the accelerator is depressed when the vehicle is started, a sudden load torque is applied at a low engine speed, which may cause the engine to stop.

To prevent this, conventionally, an excitation control device has been proposed that controls the start of energization of the electromagnetic bower clutch to be delayed for a certain period of time from the time when the accelerator is depressed. As a result, the electromagnetic powder clutch is engaged when the engine speed rises sufficiently after the accelerator is depressed, thereby preventing the engine from stopping.

(Problem to be Solved by the Invention) However, in the conventional example, since the control is such that the start of excitation of the electromagnetic clutch is delayed for a certain period of time from the time when the accelerator is depressed, the certain period of time has elapsed. Then, the excitation current will flow immediately. However, since the engine speed rise time varies depending on the throttle valve opening, in the above case, it is difficult to obtain the optimum engine speed increase characteristic for all throttle valve openings. The problem was that I couldn't do it. In other words, if the amount of accelerator pedal depression is small when starting a car, the electromagnetic powder clutch will be engaged before the engine speed has sufficiently increased, which can easily cause engine trouble. If is large, the engine speed will become too high when the electromagnetic powder clutch is engaged, which may cause a sudden start.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a throttle sensor that detects the opening degree of a throttle valve, a start determination means that determines whether the automobile starts from a stopped state, and energization start time control means for changing the energization start time of the excitation current of the electromagnetic powder clutch in accordance with the throttle valve opening detected by the throttle sensor when the start of the automobile is determined by the start determination means; It is equipped with.

(Function) With the above configuration, the present invention can change the excitation start time of the electromagnetic powder clutch in accordance with the opening degree of the throttle valve when starting the automobile.

(Embodiment) FIG. 1 is a block diagram showing the configuration of an embodiment of an automobile clutch start control device according to the present invention.

In the figure, a control circuit 4 is an electronic control circuit constructed using a microcomputer, and is composed of a microchip computer, an anticonductor memory, an input/output circuit, and the like. This control circuit 4 includes an accelerator switch 6 that detects whether or not the accelerator is depressed, a throttle sensor 7 that detects the throttle valve opening, a vehicle speed sensor 8 that detects the vehicle speed, and a shifter that detects the shift position of the transmission 2. Each output signal of the position sensor 9 is input.

Further, this control circuit 4 turns on/off the excitation circuit 11 of the t-magnetic powder clutch 3 which is used up in the clutch mechanism of the transmission 2.
A control signal is output to the excitation current on/off circuit 10 for turning off the exciting current.

The transmission 2 is equipped with an electromagnetic powder clutch 3 in its clutch mechanism, and the electromagnetic powder clutch 3 is equipped with an excitation circuit 1.
When the exciting current is supplied from 1, the magnetic powder sealed between the clutch plates is bonded by the force and the clutch plates are fastened to transmit power, and when the exciting current stops,
It becomes a released state and stops power transmission.

The excitation current on/off circuit 10 turns on/off the excitation circuit 1 when a signal instructing to start supplying the excitation current is input from the control circuit.
1 to supply an exciting current to the electromagnetic powder clutch 3, which is a switching circuit composed of a relay circuit and a switching element.

FIG. 2 is a flowchart showing the contents of the excitation start control of the electromagnetic powder clutch 3 at the time of starting according to the present invention among the controls executed in the control circuit 4. Hereinafter, the operation of the present embodiment will be explained according to this flowchart. Explain.

When the routine shown in FIG. 2 is started, it is determined in step 21 whether or not it is time for the automobile to start. This determination is
This is performed based on output signals from the accelerator switch 6, vehicle speed sensor 8, and shift position sensor 9. That is,
Based on the output of the vehicle speed sensor 8, it is determined whether the vehicle speed is zero (including almost zero), and whether the accelerator pedal is depressed or not is determined depending on whether the accelerator switch 6 is on or not. (If the accelerator pedal is depressed, the accelerator switch 6 is turned on).

Also, based on the output of the shift position sensor 9, it is determined whether the shift position is a forward or backward position (that is, a position other than the neutral position). Then, when all of these conditions are met, it is determined that the driver is about to start the car.

When it is determined in step 21 that the car is starting,
Next, in step 22, the output of the throttle sensor 7 is read, and the throttle valve opening degree is determined based on this output.

Next, in step 23, using the throttle valve opening obtained in step 22, a delay time Td corresponding to this throttle valve opening is calculated. This delay time Td is the time from when the driver performs a starting operation to when the excitation current begins to flow through the electromagnetic powder clutch 3.

Further, this delay time Td can be obtained by calculating a preprogrammed function, or by storing the corresponding value between the throttle valve opening and the delay time Td in the form of a data table in memory in advance, and calculating it from this data table. Depends on the configuration to be picked up. The delay time Td thus obtained is temporarily stored in a predetermined timer counter, and counting is started. This timer counter is a soft counter provided in the control circuit 4, and has a delay time Td
It is used to measure the time.

In the next step 24, the content of the timer counter is read to determine whether the delay time Td has elapsed. Then, when the delay time Td has elapsed, the next step 25
As a result, an energization start command signal is output to the excitation current on/off circuit 10, and the routine ends.

When the energization start command signal is input to the excitation current on/off circuit 10, the excitation circuit 11 is activated, energization is started to the electromagnetic powder clutch 3, and the clutch 3 is engaged.

Therefore, the electromagnetic powder clutch 3 is engaged and the engine power is transmitted to the drive shaft when the delay time Td calculated according to the throttle valve opening has elapsed from the time when the driver performed the start operation. Therefore, it is possible to obtain the optimum engine speed revving operation corresponding to all throttle valve opening degrees. That is, when the amount of accelerator pedal is small at the time of starting, the delay time Td is lengthened to lengthen the idling time of the engine, so that the electromagnetic powder clutch 3 can be engaged after the engine speed has been sufficiently increased. can. Further, when the accelerator amount at the time of starting is large, by shortening the delay time Td, it is possible to prevent the engine from revving more than necessary.

(Effects of the Invention) As explained in detail above, the present invention changes the excitation start time of the electromagnetic powder clutch used in the clutch mechanism of the transmission in accordance with the throttle valve opening. It is possible to obtain an optimum engine speed revving operation corresponding to the throttle valve opening degree.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a flowchart showing the details of the control according to the present invention among the controls that can be executed in the control circuit. 1... Engine 2... Transmission 3... Electromagnetic powder clutch 4... Control circuit 6... Accelerator switch 7... Throttle sensor 8... Vehicle speed sensor 9... Shift position sensor 10 ... Excitation current on/off circuit 11 ... Excitation circuit

Claims (1)

[Scope of Claims] An automobile that controls starting torque by being installed in a transmission using an electromagnetic powder clutch as a clutch mechanism, which is de-energized and released when the automobile is stopped, and is engaged when an excitation current is applied when the automobile is running. A start control device for a clutch for use in a vehicle includes: a throttle sensor that detects the opening degree of a throttle valve; a start determining means that determines whether the vehicle is to start from a stopped state; and when the start determining means determines that the vehicle is starting;
Start control for a clutch for an automobile, characterized in that it comprises energization start time control means for changing the energization start time of the excitation current of the electromagnetic powder clutch in accordance with the throttle valve opening degree detected by the throttle sensor. Device.