JPH04298657A - Engine control device for vehicle provided with anti-skid brake device - Google Patents

Abstract

PURPOSE:To improve operability of an anti-skid brake device by providing a pressure reducing detecting means which detects reduction of the pressure in the anti-skid brake device, and a fuel cut control means which stops the operation of a fuel cut device or increases a control rotational speed thereof. CONSTITUTION:An operation signal from an anti-skid brake device 12 is input to an engine control unit 10, while the engine control unit 10 outputs a control signal to a fuel cut control device 14. When the anti-skid brake device 12 is operated and a pressure is decreased, the condition is detected by a pressure reducing detecting means. In this case, the fuel cut device 14 is completely stopped or a control rotational speed of the fuel cut device 14 is increased. A reversed driving force of an engine is reduced accordingly, so that a wheel can be abruptly rotated from a condition of being locked.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine control system for a vehicle equipped with an anti-skid brake system.

0002

[Prior Art] An anti-skid brake device is a device that prevents the wheels from becoming completely locked when the brake pedal is pressed hard. During operation, the anti-skid brake device locks and releases the wheels. will be repeated. Conventionally, the operation of the anti-skid brake device is unrelated to the operation of the engine's fuel cut device, and the operating state of the fuel cut device does not change depending on whether the anti-skid brake device is activated or not.

0003

In the case of a vehicle equipped with an anti-skid brake device, there is a problem in that when the reverse driving force of the engine is large, the controllability of the anti-skid brake device decreases. That is, when the wheels lock, the anti-skid brake device operates to reduce the brake fluid pressure, but if the engine resistance is large, it takes time to increase the rotation of the wheels, transmission, and engine. When the fuel cut device stops the fuel supply, the reverse driving force of the engine becomes greater than in the normal case. Therefore, even if the brake fluid pressure is reduced, the increase in wheel rotation is delayed, and the controllability of the anti-skid brake device is reduced. The present invention aims to solve these problems.

0004

[Means for Solving the Problems] The present invention solves the above problems by limiting the operation of the fuel cut device when the anti-skid brake device is activated. That is, as shown in FIG. 1, the engine control device for a vehicle equipped with an anti-skid brake device according to the present invention includes a pressure reduction operation detection means for detecting a pressure reduction operation of the anti-skid brake device, and a pressure reduction operation detection means for detecting a pressure reduction operation of the anti-skid brake device. A fuel cut limiting means that stops the operation of the fuel cut device of the engine or increases the controlled rotational speed of the fuel cut device when detected;
have.

[0005]

[Operation] When the anti-skid brake device is activated and a pressure reduction operation is performed, this is detected by the pressure reduction operation detection means. In this case, the operation of the fuel cut device is completely stopped, or the control rotational speed of the fuel cut device (that is, the vehicle speed at which fuel cut is started and the vehicle speed at which fuel cut is stopped and fuel supply is resumed) is increased. This reduces the reverse driving force of the engine,
The wheels can now be rotated rapidly from a locked state. Therefore, the operability of the anti-skid brake device is improved.

[0006]

[Embodiment] As shown in FIG. 2, an operating signal from an anti-skid brake device 12 is input to an engine control unit 10, and on the other hand, the engine control unit 10 outputs a control signal to a fuel cut control device 14. It is configured as follows.

[0007] In the engine control unit 10,
Control is performed according to the control flow shown in FIG. 3 and at the timing shown in FIG. First, it is determined whether or not the anti-skid brake device 12 is operating, and if the anti-skid brake device 12 is not operating, a signal is output to the fuel cut control device 14 to permit its operation; When the brake device 12 is operating, it is determined whether or not the pressure reduction operation is being performed, and when the pressure reduction operation is not being performed, a signal is output to the fuel cut control device 14 to permit this operation, while the pressure reduction operation is being performed. If so, a signal is output to the fuel cut control device 14 to prohibit its operation. By doing so, when the anti-skid brake device 12 operates to reduce the pressure, the fuel cut operation is prohibited and fuel is supplied to the engine, so that the reverse driving force of the engine is reduced. Therefore, the speed at which the rotation of the wheel increases from the locked state due to the operation of the anti-skid brake device 12 increases, and the operability of the anti-skid brake device 12 improves.

In the above embodiment, the operating state of the anti-skid brake device 12 is detected using a signal directly from the actuator solenoid or pump motor of the anti-skid brake device 12. Further, in the above embodiment, the fuel cut operation is completely prohibited, but instead, the vehicle speed at which the fuel cut operation is started and the vehicle speed at which it is canceled may be made higher than in the normal case. Alternatively, a signal instructing rapid deceleration may be input from the transmission-side control unit to the engine control unit, thereby limiting the fuel cut operation.

[0009]

As explained above, according to the present invention, the operation of the fuel cut device is stopped or restricted when the anti-skid brake device operates to reduce pressure. The driving force is reduced, and the start of rotation of the wheel from the locked state can be made faster, and the operability of the anti-skid brake device can be improved. Also,
Since the operation of the fuel cut device is stopped or limited only when the pressure is reduced, the fuel cut is activated when the pressure is increased and the fuel efficiency is not deteriorated.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the relationship between components of the present invention.

FIG. 2 is a diagram showing the configuration of the embodiment as a block diagram.

FIG. 3 is a diagram showing a control flow.

FIG. 4 is a diagram showing control timing.

[Explanation of symbols]

10 Engine control unit 12 Anti-skid brake device 14 Fuel cut control device

Claims (1)

[Claims] 1. A pressure reduction operation detection means for detecting a pressure reduction operation of an anti-skid brake device, and a means for stopping the operation of an engine fuel cut device or cutting the fuel when the pressure reduction operation of the anti-skid brake device is detected by the pressure reduction operation detection means. An engine control device for a vehicle equipped with an anti-skid brake device, comprising: a fuel cut limiting means for increasing the control rotational speed of the device.