JP2000351359A - Braking force control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate inconvenience such as a wheel slip by holding braking force at traveling time by providing a monitoring means for monitoring whether or not an antilock control device is normal, and providing an actuation releasing means for prohibiting actuation of a braking force holding device when the antilock control device is not normal. SOLUTION: This braking force control device 1 has an antilock control device 3 and a braking force holding device 5. A control unit 27 monitors whether or not the antilock control device 3 is normal by a monitoring means 36 to prohibit actuation of the braking force holding device 5 by an actuation releasing means 38 when judging that the antilock control device is not normal. In this braking force control device 1, the actuation releasing means 38 immediately operates when the antilock control device 3 does not normally function by failure to prohibit actuation of the braking force holding device 5 to thereby eliminate inconvenience such as a slip of a wheel by holding braking force of the braking force holding device 5 at traveling time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-lock control device for monitoring the rotation of wheels during running and controlling the braking force applied to each wheel so that the wheels do not lock.
And a braking force holding device that operates a braking force holding mechanism that holds a braking force when it is determined that the vehicle is in a stopped state. The present invention relates to an improvement for preventing a malfunction.

[0002]

2. Description of the Related Art For the purpose of improving running stability under adverse road conditions or cornering, the rotation of the wheels is monitored during running to control the wheels so that the wheels are not locked. Antilock control devices for controlling power have been developed. In addition, for example, when the vehicle is temporarily stopped by a stop signal or when the vehicle is parked and stopped on a slope, the driver's labor is reduced. A braking force holding device including a braking force holding mechanism for holding the braking force generated by the braking means when it is determined that the vehicle is in the stop state has been developed.
Recently, a braking force control device including both an anti-lock control device and a braking force holding device has been developed.

[0003]

However, in the case where a plurality of braking force control functions having different purposes are provided, if a failure occurs in one of the braking force control functions, the other braking force control function may be used. To prevent the braking force control function from malfunctioning,
Care must be taken. For example, in a conventional braking force holding device, when detecting a wheel speed for determining a stop of a vehicle, a speed sensor for a speedometer that detects an average speed of driving wheels is used. The configuration is not individually arranged for each. Therefore, for example, when the antilock control device does not function properly due to a failure and some wheels are locked, the locked wheels are drive wheels whose speeds are detected by a speedometer speed sensor. And, the braking force holding device mistakenly recognizes that the wheel speed conforms to the vehicle stop determination condition, and operates the braking force holding mechanism in spite of running, so that a slip or the like due to locking of the wheels can be prevented. There is a possibility of inviting.

The present invention has been made in view of the above circumstances, and is a braking force control device including an antilock control device and a braking force holding device, wherein the antilock control device does not function normally due to a failure. When some of the wheels fall into the locked state, the locked wheel is a wheel set for determining whether the braking force holding device is stopped, and it is determined that the vehicle is stopped based on the wheel speed. However, the braking force holding device does not accidentally operate the braking force holding mechanism during running of the vehicle, and therefore, there is no risk of inconvenience such as wheel slippage due to holding of the braking force during running. It is an object to provide a braking force control device.

[0005]

In order to achieve the above object, a braking force control apparatus according to the present invention monitors the rotation of a wheel during traveling and uses the braking means by the braking means to prevent the wheel from being locked. An anti-lock control device that controls the braking force that acts on the vehicle, and a braking force holding device that operates a braking force holding mechanism that holds the braking force generated by the braking means when the vehicle is determined to be in a stopped state. In the braking force control device, the braking force control device is provided with monitoring means for monitoring whether the antilock control device is normal, and when the antilock control device is not normal, the braking force holding device An operation release means for inhibiting operation of the device is provided.

According to the above configuration, if the antilock control device does not function normally due to a failure, the operation release means immediately operates to inhibit the operation of the braking force holding device. Therefore, when some wheels fall into a locked state due to a failure of the anti-lock control device, the locked wheel is a wheel set for determining the stop of the braking force holding device, and the vehicle speed is determined based on the wheel speed. Even when it is determined that the vehicle is stopped, the braking force holding device does not erroneously operate the braking force holding mechanism while the vehicle is running.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a braking force control device according to the present invention will be described below in detail with reference to the drawings. 1 and 2 show an embodiment of a braking force control device according to the present invention. FIG. 1 is a block diagram showing a schematic configuration of the braking force control device according to the present invention, and FIG. It is a flowchart of the operation release means provided in the apparatus.

As shown in FIG. 1, the braking force control device 1 includes an anti-lock control device 3 and a braking force holding device 5. Here, the antilock control device 3
The object of the present invention is to prevent the occurrence of slip caused by the locking of the wheels during braking, and to improve the running stability under adverse road conditions or cornering. The anti-lock control device 3 is provided for each wheel and detects wheel speeds 7a, 7b, 7 for detecting the speed of each wheel.
c, 7d, a fluid pressure type braking means 11 such as a disc brake unit for applying a braking force to the wheels in accordance with a brake operation by the brake pedal 9, and a fluid pressure supplied to the braking means 11 of the rear wheel 12, which is a driving wheel. 13 for controlling the pressure reduction of each wheel, and wheel speed sensors 7a, 7b, 7c, 7
d, the rotation of each wheel is monitored during traveling, and a modulator 13
And a control unit 15 for controlling the fluid pressure supplied to the braking means 11 to control the braking force acting on each rear wheel 12. Control unit 1
Reference numeral 5 denotes a so-called computer which performs a self-diagnosis at the start of the engine as to whether or not the engine can be operated normally. .

In this embodiment, when the brake pedal 9 is operated, the master cylinder 19 outputs a fluid pressure corresponding to the depression amount and the depression speed of the brake pedal 9 to the braking means 11 via the flow path 21 at that time. I do. The modulator 13 is provided in the flow path 21 and reduces the fluid pressure supplied to the braking means 11 based on a control signal from the control unit 15.

The braking force holding device 5 determines whether the vehicle is in a stopped state for the purpose of reducing the driver's labor when the vehicle is temporarily stopped by a stop signal or when the vehicle is parked and stopped on a slope. Is maintained, and the braking force generated by the braking means 11 when the vehicle is determined to be in a stopped state is maintained in a held state. Specifically, the braking force holding device 5
The flow path 21 for maintaining the braking force generated by the braking means 11
And a control unit 27 that controls the operation of the braking force holding mechanism 25 based on the speed of some wheels of the vehicle and other specified vehicle stop conditions. It is a configuration provided. The braking force holding mechanism 25 is a normally-open two-position switching solenoid valve. When it is determined that the vehicle is in a stopped state, the braking force holding mechanism 25 switches the position by a control signal from the control unit 27 and Is closed, and the braking force is maintained by maintaining the fluid pressure on the braking means 11 side.

The control unit 27 is a so-called computer, which is an output of a wheel speed sensor 29 for a speedometer, an output of a brake switch 31 for detecting whether or not a service brake (brake pedal 9) is being operated, and an operation state of a clutch. Output of a clutch switch 32 for detecting the operation of a parking brake, an output of a gear switch 34 for detecting a gear selection position of a transmission, and outputs of these switches and sensors. The stop of the vehicle is determined based on.

The control unit 27 is equipped with monitoring means 36 for monitoring whether or not the antilock control device 3 is normal. When the antilock control device 3 is not normal, the control unit 27 controls the braking force holding device 5. An operation release means 38 for inhibiting operation is provided. In the case of this embodiment,
The monitoring means 36 controls the control unit 15 when the anti-lock control device 3 stops operating due to a failure or the like.
Is the signal for the alarm lamp output.

With the above configuration, the control unit 27 of the present embodiment, as shown in FIG.
It is monitored whether or not the antilock control device 3 is normal (step 101). If it is determined that the antilock control device 3 is not normal, the operation release means 38 is activated.
Inhibits the operation of the braking force holding device 5 (step 1
02). That is, the control unit 2 of the present embodiment
7 operates the braking force holding mechanism 25 (closes the electromagnetic valve) only when the antilock control device 3 can normally operate and the vehicle is determined to be in the stopped state, Is maintained. In addition, a check valve 40 is provided in parallel with the braking force holding mechanism 25 on the flow path 21 so as to enable pressurization when the brake pedal 9 is further depressed.

In the braking force control device 1 described above, if the antilock control device 3 does not function normally due to a failure, the operation releasing means 38 immediately operates to inhibit the operation of the braking force holding device 5. Therefore, when some of the wheels fall into the locked state due to the failure of the antilock control device 3, the locked wheel is the wheel set for determining the stop of the braking force holding device 5, and the wheel speed Even when it is determined that the vehicle is stopped, the braking force holding device 5 does not accidentally operate the braking force holding mechanism 25 while the vehicle is running. In other words, there is no possibility of inconvenience such as slipping of wheels due to holding of the braking force by the braking force holding device 5 during traveling, and a braking force control device with high operation reliability can be provided.

The monitoring means for monitoring whether or not the antilock control device 3 is normal is not limited to the above embodiment. For example, the antilock control device 3 itself may be provided with a circuit that notifies the control unit 27 of the braking force holding device 5 of the occurrence of a fault to the antilock control device 3 itself. Further, the specific configuration of the braking force holding mechanism 25 is not limited to the above embodiment. Various known mechanisms can be employed.

[0016]

According to the braking force control device of the present invention, if the antilock control device does not function normally due to a failure, the operation release means immediately operates to inhibit the operation of the braking force holding device. . Therefore, when some wheels fall into the locked state due to the failure of the antilock control device,
Even if the locked wheel is a wheel set for determining the stop of the braking force holding device, and the vehicle speed is determined to be stopped based on the wheel speed, the braking force holding device may be erroneously operated while the vehicle is running. As a result, the braking force holding mechanism is not operated. That is, there is no possibility of inconvenience such as wheel slippage due to holding of the braking force by the braking force holding device during traveling, and a braking force control device with high operation reliability can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a braking force control device according to the present invention.

FIG. 2 is a flowchart of an operation release unit provided in the braking force holding device in the braking force control device shown in FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 braking force control device 3 anti-lock control device 5 braking force holding device 7a, 7b, 7c, 7d wheel speed sensor 9 brake pedal 11 braking means 13 modulator 15 control unit 17 alarm lamp 19 master cylinder 21 flow path 25 braking force holding mechanism 27 Control unit 29 Wheel speed sensor for speedometer 31 Brake switch 32 Brake switch 33 Parking switch 34 Gear switch 36 Monitoring means 38 Deactivation means 40 Check valve

Claims (1)

[Claims] An anti-lock control device for monitoring the rotation of a wheel during traveling and controlling a braking force applied to the wheel by a braking means so that the wheel does not fall into a locked state, and when the vehicle is stopped. A braking force holding device that operates a braking force holding mechanism that holds a braking force generated by the braking means when the determination is made, a braking force control device comprising: Monitoring means for monitoring whether or not the braking force is normal, and a braking force control device comprising an operation releasing means for inhibiting the operation of the braking force holding device when the antilock control device is not normal. .