JPH06221200A - Control device for internal combustion engine for vehicle with antiskid device - Google Patents

Abstract

PURPOSE:To provide a control device for an internal combustion engine for a vehicle with an antiskid device to ensure a sufficient brake force by preventing the occurrence of a stole to an internal combustion engine even when a brake is rapidly stepped on and an antiskid device is operated. CONSTITUTION:In a vehicle on which an antiskid device 7 is mounted, a control device for an internal combustion engine comprises an intake air amount regulating means 1 to regulate an amount of intake air to an internal combustion engine 4; an antiskid device operation detecting means 2 to detect operation of an antiskid device 5; and an intake air amount correction means 3 to effect correction such that an intake air amount by the intake air amount regulating means 1 is increased during operation of an antiskid device 5 As a result a stall hardly occurs to an internal combustion engine during operation of the antiskid device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an internal combustion engine of a vehicle with an antiskid device, and more particularly to a vehicle with an antiskid brake device so that the internal combustion engine does not stall when the antiskid brake device is operating. Related to the control device.

[0002]

2. Description of the Related Art With the recent development of technology, there are remarkable improvements in the running performance of automobiles. As the performance of automobiles improves and high-speed driving becomes possible, braking performance from a high-speed running state becomes important. Braking while the car is normally running at low speed was just possible by locking the wheels, but when the car is running at high speed, the road surface is wet, or the road surface is frozen. When the brakes are applied suddenly at times, the method of locking the wheels causes the wheels to slip significantly against the road surface, which deteriorates the effectiveness of the brakes and increases the braking distance. Further, when the steering wheel is turned off and the brakes are applied in this state to lock the wheels, the vehicle body may skid and lose its directionality.

This is because the effectiveness of the brake is adversely reduced when the slip between the road surface and the tire exceeds about 20%, and it is better not to lock the tire completely in such a state. In order to prevent such problems with conventional braking systems, the wheels are now not completely locked when some vehicles are suddenly braked, and the hydraulic pressure of the brakes is adjusted so that the wheels continue to rotate. An anti-skid brake control device (hereinafter simply referred to as an anti-skid device) for controlling is adopted.

This anti-skid device is conventionally equipped with a hydraulic control system and an electronic control system (ESC: Electric Ski).
d Control System). The hydraulic pressure control method is designed so that the hydraulic pressure applied to the brakes of the drive wheels does not exceed a prescribed value by the force of a preset spring. In ESC, the computer calculates the rotational speed of the drive wheels and the braking state during sudden braking, and controls the hydraulic pressure to the brakes in detail according to the operating state of the vehicle so that the programmed ideal braking state is achieved. Is.

[0005]

However, in the conventional anti-skid device constructed as described above, when the anti-skid device is actuated by sudden braking, the internal combustion engine is particularly controlled. Since there is no,
When the internal combustion engine stalls due to the sudden braking, the hydraulic pressure acting on the brake device is not generated, and the braking force may decrease.

Therefore, according to the present invention, when the anti-skid device is actuated by suddenly stepping on the brake, the intake air amount to the internal combustion engine is increased as compared with the normal time to improve the rotation speed of the internal combustion engine and the stall does not occur. An object of the present invention is to provide a control device for an internal combustion engine of a vehicle with an anti-skid device, which can secure a sufficient braking force in this way.

[0007]

FIG. 1 shows the configuration of a control device for an internal combustion engine of a vehicle with an anti-skid device according to the present invention which achieves the above object. As shown in FIG.
In a vehicle provided with an antiskid brake device 5, an intake air amount adjusting means 1 for adjusting the intake air amount to the internal combustion engine 4, and an antiskid brake device operation detecting means 2 for detecting the operation of the antiskid brake device 5. ,
When the anti-skid brake device 5 is actuated, the intake air amount correcting means 3 is provided to correct the intake air amount by the intake air amount adjusting means 1 so as to increase.

As the intake air amount adjusting means 1, an idle speed control valve 7 provided in the intake passage 4a of the internal combustion engine 4 by bypassing the throttle valve 6 can be used.

[0009]

According to the control device for an internal combustion engine of a vehicle with an anti-skid device of the present invention, when the operation of the anti-skid brake device is detected in a vehicle provided with an anti-skid brake device, intake air to the internal combustion engine is detected. The quantity is increased above a value depending on the current operating state of the internal combustion engine. As a result, the rotation speed of the internal combustion engine increases, and the internal combustion engine is less likely to stall.

[0010]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 2 is an overall configuration diagram showing a schematic configuration of an embodiment of a control device for an internal combustion engine (engine) of a vehicle with an anti-skid device according to the present invention. In the figure, 10 is an anti-skid device. This anti-skid device 10 operates the brake device 11 provided on each of four tires T1 to T4 of an automobile, the brake pedal 12, and the brake pedal 11 when the brake pedal 12 is depressed. ESC actuator 13 operated by hydraulic pressure, front speed sensor 14 that detects the rotational speed of front wheels T1, T2, rear speed sensor 1 that detects the rotational speed of rear wheels T3, T4
5 and the front wheels T1 input from the sensors 14 and 15
From the rotational speeds of T2 and rear wheels T3 and T4, make sure that the front and rear wheels T1 to T4 do not lock when sudden braking is applied.
It is composed of an ESC computer 16 that drives and controls the SC actuator 13.

In the figure, 20 is an engine,
In the intake passage 20a, an air cleaner 21, an air flow meter 22, a throttle valve 23, an idle speed control valve (ISCV) 24, a surge tank 25, and a fuel injection valve 26 are provided in this order from the upstream side. Furthermore,
Inside the cylinder block 20b of the engine 20, there is a combustion chamber 27 that houses a piston 28, and this combustion chamber 27 is provided with an intake valve V1, an exhaust valve V2, and a spark plug 29. 20c is an exhaust passage.

The ISCV 24 is provided in the intake passage 20a in parallel with the throttle valve 23, and its air outlet is opened in the surge tank 25 so that the engine 2 can operate during idle rotation.
A signal from an electronic control unit (ECU: engine control unit) 0 of 0 controls the engine speed by increasing or decreasing the amount of air that bypasses the throttle valve 23. Therefore, if the ECU 30 stores the target rotational speed according to the operating state of the engine, the amount of air flowing through the bypass passage of the throttle valve can be adjusted by the signal from each sensor. Even if the engine speed changes, the engine speed can always be maintained at a constant value, and the engine speed can be controlled to be optimum even at low temperatures.

The rotor incorporated in the ISCV 24 is generally driven by a step motor, and is normally or reversely rotated by a certain angle according to a signal from the ECU 30 applied to its coil. The rotor and the valve body are screw-fitted, and the valve body can move back and forth by the rotation amount of the rotor. As a result, the valve body and IS
The amount of intake air can be controlled by changing the gap between the CV 24 and the body. FIG. 5 is a diagram showing the relationship between the step number ST of the step motor and the air flow rate. In this way, as the step number ST of the step motor increases, the air flow rate also increases.

The operation of the engine controller of the vehicle with an anti-skid device constructed as described above will be described below with reference to a flowchart. FIG. 3 is a flow chart showing an example of the procedure of the operation of the engine control device for a vehicle with an anti-skid device according to the present invention, which is executed when the throttle valve 23 is fully closed and in an idle state. First, step 3
In 01, the operating state parameter of the engine 20, for example,
The water temperature THW, the on / off state of the air conditioner (air conditioner) A / C, the shift state NSW, the state of the idle switch IDL, etc. are read. Next, at step 302, the opening degree (number of steps) of the ISCV (idle speed control valve) 24 is calculated using the engine operating condition parameter.

Then, in step 303, it is judged whether or not the anti-skid device 10 is in operation. If the anti-skid device 10 is not in operation, this routine is ended, but if the anti-skid device 10 is in operation, Go to step 304. Since the driver is stepping on the brake pedal 12 while the anti-skid device 10 is in operation, the accelerator pedal (not shown) is in the off state, and the throttle valve 23 fully closes the intake passage 20a. Step 3
In 04, the opening degree ST of the ISCV 24 according to the current operating state of the engine calculated in step 302 is set to a fixed amount S.
Increase TABS only.

As a result, even if the throttle valve 23 is fully closed when the antiskid device 10 is operated, the ISCV 24
Since the opening degree (step number ST) of is larger than that of the normal time, the engine speed is increased and the engine is less likely to stall. Therefore, in a severe situation where the operation of the anti-skid device 10 is required, it is possible to avoid a situation in which the engine stalls for some reason and sufficient braking force cannot be obtained, and safety is improved. .

In the embodiment described above, step 3
02, the opening of the idle speed control valve is calculated,
When the anti-skid device 10 is operated, the step number ST of the step motor is increased in step 304 to increase the intake air amount. However, in a vehicle provided with a constant speed traveling device, the opening of the throttle valve 23 is set to the accelerator pedal position. Since the control can be performed regardless of the depression amount, it is possible to increase the opening amount of the throttle valve 23 and increase the intake air amount during the operation of the anti-skid device 10. For example, in step 302, the opening of the throttle valve 23 is calculated by the duty ratio DU instead of the number ST of steps, and step 3 is performed when the anti-skid device 10 is operating.
In 04, a constant amount DUABS is added to the duty ratio DU that determines the opening degree of the throttle valve 23.
The opening may be increased.

FIG. 4 is a flow chart showing another embodiment of the operation procedure of the control device for the engine of the vehicle with an anti-skid device according to the present invention. The intake air amount during operation of the anti-skid device 10 is fixed to the ISCV 24. It shows an example in which the control is performed every time. First, in step 401, an operating state parameter of the engine 20, for example, the water temperature THW,
The on / off state of the air conditioner (air conditioner) A / C, the shift state NSW, the state of the idle switch IDL, etc. are read. Next, in step 402, it is determined whether or not the anti-skid device 10 is operating. If the anti-skid device 10 is not operating, the process proceeds to step 403, and if the anti-skid device 10 is operating, the process proceeds to step 404.

In step 403 which is carried out when the anti-skid device 10 is not in operation, the opening (number of steps) of the ISCV 24 is calculated using the engine operating condition parameter, and this routine is ended. On the other hand, in step 404 which is performed when the anti-skid device 10 is in operation, the IS
Fixed value KSTAB for the opening of CV24 (number of steps ST)
S is entered, and ISCV24 has this fixed value KSTABS
Controlled by. This fixed value KSTABS is larger than the opening of the ISCV 24 during normal idle operation.

As described above, when the anti-skid device 10 is operated, the engine speed can be increased by increasing the opening degree (step number ST) of the ISCV 24 by using the fixed value KSTABS to increase the engine speed, and the engine stalls. Hard to do. Therefore, in a severe situation where the operation of the anti-skid device 10 is required, it is possible to avoid a situation in which the engine stalls for some reason and sufficient braking force cannot be obtained, and safety is improved. .

In the embodiment of FIG. 4, step 40
Since it is determined whether or not the antiskid device 10 is operating before calculating the opening degree ST of the ISCV 24 in 3, it is not necessary to perform the calculation in step 403 when the antiskid device 10 is operating, This is advantageous in terms of execution processing speed.

[0022]

As described above, according to the present invention,
Since the intake air amount to the internal combustion engine is increased when the anti-skid device operates, the internal combustion engine is less likely to stall, and the anti-skid device has an effect of obtaining a sufficient braking force.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing a principle configuration of a control device for an internal combustion engine of a vehicle with an anti-skid device according to the present invention.

FIG. 2 is an overall configuration diagram showing a configuration of an embodiment of a control device for an internal combustion engine of a vehicle with an anti-skid device according to the present invention.

FIG. 3 is a flowchart illustrating the operation of an embodiment of the ECU of FIG.

4 is a flowchart illustrating the operation of another embodiment of the ECU of FIG.

5 is a diagram showing the relationship between the number of steps of the ISCV of FIG. 2 and the air flow rate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Intake air amount adjusting means 2 ... Anti-skid brake device actuation detecting means 3 ... Intake air amount correcting means 5 ... Anti-skid brake device 10 ... Anti-skid device 11 ... Brake device 12 ... Brake pedal 13 ... ESC actuator 16 ... ESC computer 20 ... Internal combustion engine 24 ... ISCV (idle speed control valve) 30 ... ECU (engine control unit)

Claims (2)

[Claims] 1. A control device for an internal combustion engine in a vehicle with an antiskid brake device, comprising: intake air amount adjusting means for adjusting the intake air amount to the internal combustion engine; and antiskid brake for detecting the operation of the antiskid brake device. A vehicle with an anti-skid device, comprising: device operation detection means; and intake air amount correction means for correcting the intake air amount by the intake air amount adjusting means to increase when the anti-skid brake device is activated. Internal combustion engine control device. 2. The anti-skid device according to claim 1, wherein the intake air amount adjusting means is an idle speed control valve provided in an intake passage of the internal combustion engine by bypassing the throttle valve. For controlling an internal combustion engine of a vehicle equipped with a vehicle.