JPH0338415B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a driving force control device for an automobile, in particular, a system that automatically reduces the driving force of an engine when the slip rate of the drive wheel tires exceeds a certain value. The present invention relates to a driving force control device as described above.

[Conventional technology]

If too much force is applied to the brake pedal when controlling a car, there is a risk that the wheels will lock up and the vehicle will lose its directional stability and maneuverability.Therefore, technology has been developed to prevent this risk by equipping cars with anti-lock devices. Electronic antilock devices have recently been proposed.

The electronic anti-lock device described above includes at least one wheel rotation sensor, an electronic information processing device such as a microprocessor that determines whether the wheels are locked based on a signal from the sensor and issues an anti-lock control command, and a It is comprised of a modulator that performs anti-lock control using pressure such as hydraulic pressure, air pressure, or vacuum pressure.

On the other hand, if a driving force that exceeds the frictional force between the driving tires and the road surface acts while the car is running, the driving tires will slip, but conventionally, in such cases, the driver's accelerator pedal operation was not enough. I had no choice but to adjust the driving force.

[Problem to be solved by the invention]

As described above, this invention provides driving force control that automatically reduces the driving force without requiring the driver to operate the accelerator pedal when an excessive driving force that causes the drive wheels to slip while driving is applied. The purpose is to provide equipment.

[Means to solve the problem]

In order to achieve the above object, the present invention has at least one wheel rotation sensor on each of the front wheels and the rear wheel, and an electronic information system that determines whether the wheels are locked based on the signals from the sensors and issues an anti-lock control command. In a vehicle equipped with an anti-lock brake system having a processing device, an engine driving force reduction device and a deceleration detection sensor are installed,
During driving, the electronic information processing device calculates the sliding rate of the driving wheel by comparing the driving wheel rotational speed and the driven wheel rotational speed based on the detection signal of the wheel rotation sensor, and calculates the slippage rate of the driving wheel based on the acceleration signal from the deceleration detection sensor. The limited set value of the ratio is changed, and when the slip ratio exceeds the set value, an activation signal is output to the engine driving force reduction device.

〔Example〕

The accompanying drawing is a block diagram of the case where the driving force control device according to the present invention is applied to an automobile having a conventional electronic anti-lock device.

The brakes 1, 1, 2, 2 of each wheel are connected to two piping systems 3, 3, and the hydraulic pressure from the master cylinder 4 is applied directly to the brakes 1, 1, respectively, and to the rear wheel brakes 2, 2. is adapted to act via a proportioning valve 5.

Antilock control modulators 6, 6, 7, 7 each having a valve device are provided corresponding to each of the brakes 1, 1, 2, 2, and each modulator is connected to a driving pressure source 9. These modulators 6, 6, 7, and 7 are actuated by antilock control command signals generated by the microprocessor 10, and control the hydraulic pressures of the respective brakes 1, 1, 2, and 2.

Further, wheel rotation sensors 13 and 14 are provided on the front wheel 11 and the rear wheel 12, respectively, and detection signals of wheel rotation from the respective sensors 13 and 14 are input to the microprocessor 10. In the microprocessor 10, a lock is detected when a wheel begins to lock, such as when the deceleration of one wheel becomes extremely large compared to other wheels, or when a wheel rotation abnormality occurs due to locking.

The above-mentioned electronic anti-lock device is conventionally known, and in the illustrated case, a control valve 15 operated from a microprocessor 10 as a brake control device is provided between the driving pressure source 9 and the actuator 16, and the brake pedal 17 is controlled by the depression force. Detection sensor 18
and a deceleration detection sensor 19 using a weight,
The control valve 15 is operated by the microprocessor 10 based on the magnitude of the pedal depression force and deceleration, and the output hydraulic pressure from the master cylinder 4 is controlled.

On the other hand, driving force control is performed using the wheel rotation sensors 13, 14, deceleration detection sensor 19, and microprocessor 10 in the electronic anti-lock device described above. An actuator 21 for adjusting a throttle valve 20 is connected to the output side of the microprocessor 10 as an engine driving force adjustment device. This actuator 2
1 is an accelerator pedal 22 and a throttle valve 20
The throttle valve 2 is connected in series or parallel to the connecting mechanism of
0.

In the microprocessor 10, the front wheel 11
Detection signals from the wheel rotation sensor 13 of the rear wheel 12 and the wheel rotation sensor 14 of the rear wheel 12 are input, and the rotation speed of the driving wheel and the rotation speed of the driven wheel are compared to calculate the slip rate. The limit setting value of the slip rate is changed according to the magnitude of the acceleration signal obtained from the deceleration detection sensor 19 by inputting it into the microprocessor 10.

When the actual slip ratio exceeds the above set value, the microprocessor 10 outputs a driving force control signal, and the actuator 21 described above is actuated to reduce the driving force of the engine.

Further, as another means for controlling the driving force of the engine, there is a method of sending the above-mentioned driving force control signal to the electronic engine control device 23 and controlling the driving force of the engine through the electronic engine control device 23.

[Effects of the Invention] This invention calculates the slip rate of the drive wheels by adding the acceleration signal obtained from the deceleration detection sensor to the comparison result of the rotational speed of the drive wheels and the driven wheels, and calculates the slip rate of the drive wheels when the slip rate is equal to the set value. If the threshold is exceeded, the driving force of the engine is automatically reduced without depending on the driver's operation of the accelerator pedal, so the slip rate is appropriately changed depending on the acceleration situation of the vehicle. This prevents the wheels from spinning and contributes to safe driving.

[Brief explanation of the drawing]

The drawing is a block diagram of an embodiment. 10...Microprocessor, 11...Front wheel.
12... Rear wheel, 13, 14... Wheel rotation sensor, 19... Deceleration detection sensor, 20... Throttle valve, 21... Actuator, 22...
...Accelerator pedal, 23...Electronic engine control device.

Claims (1)

[Scope of Claims] 1. An anti-lock brake system having at least one wheel rotation sensor on each of the front wheels and the rear wheel, and an electronic information processing device that determines whether the wheels are locked based on a signal from the sensor and issues an anti-lock control command. In a car equipped with a lock brake device,
An engine driving force reduction device and a deceleration detection sensor are provided, and the electronic information processing device compares the driving wheel rotation speed and the driven wheel rotation speed based on the detection signal of the wheel rotation sensor during driving, and calculates the slip rate of the driving wheel. The limited set value of the slip rate is changed based on the acceleration signal from the deceleration detection sensor, and when the slip rate exceeds the set value, an activation signal is output to the engine driving force reduction device. A driving force control device. 2. The driving force control device according to claim 1, wherein the engine driving force reducing device is constituted by an actuator connected in series to a connecting mechanism between an accelerator pedal and a throttle valve. 3. The driving force control device according to claim 1, wherein the engine driving force reducing device is an electronic engine control device.