JPH07172277A - Anti-skid control device - Google Patents

Abstract

PURPOSE:To prevent brake operation from retarding by providing a pipeline communicating the anti-skid control valve device side and the air chamber side of a relay valve with each other, and providing within the pipeline a one- way valve that permits compressed air to flow from the anti-skid control valve side to air chambers but not vice versa. CONSTITUTION:The pressure of compressed air supplied directly from a one-way valve 14 to air chambers 11, 12 and the pressure of compressed air supplied from an air reservoir 7 to the air chambers 11, 12 are not built up but held constant. A bypass pipeline 13 that communicates an anti-skid control valve device 5 with the air chambers 11, 12 via the one-way valve 14 is provided, and not only the compressed air supplied from a relay valve 4 to the air chambers 11, 12 but also compressed air discharged from a brake valve 1 can be supplied directly to the air chambers 11, 12 through the bypass pipeline 13, so that the delay of braking operation can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antiskid control valve device for preventing wheels from locking during braking of a vehicle.

[0002]

2. Description of the Related Art In this type of anti-skid control device, as disclosed in, for example, Japanese Patent Publication No. 58-49416, a brake valve that discharges compressed air according to a driver's operation amount, and a brake valve A relay valve that discharges the air pressure stored in the air reservoir according to the air pressure of the compressed air that is supplied, a plurality of air chambers (brake actuators) that are supplied with air pressure from the relay valve to perform a braking action, the brake valve and the The anti-skid control valve device is provided between the relay valve and the anti-skid control valve device that controls the air pressure supplied to the relay valve in response to a command from a determination circuit that monitors the behavior of the wheels.

[0003]

In this conventional anti-skid control device, when a plurality of air chambers (brake actuators) are controlled by one anti-skid control valve device, the volume of compressed air becomes large and the brake operation delay is delayed. Therefore, a relay valve is provided between the anti-skid control valve device and the air chamber to eliminate the above-mentioned operation delay. However, since the relay valve itself has hysteresis, it is difficult to perform fine control. was there.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an anti-skid control device capable of eliminating a brake operation delay and enabling fine control.

[0005]

In order to achieve the above object, an anti-skid control device of the present invention is provided with a brake valve that discharges compressed air according to the operation amount of a driver, and the brake valve. A relay valve that discharges the air pressure stored in the air reservoir according to the air pressure of the compressed air, a plurality of air chambers that are supplied with air pressure from the relay valve to perform a braking action, and between the brake valve and the relay valve. An anti-skid control device provided with an anti-skid control valve device for controlling the air pressure supplied to the relay valve in response to a command from a determination circuit that monitors the behavior of the wheels, wherein the anti-skid control of the relay valve is performed. A pipeline connecting the valve device side and the air chamber side is provided, and the anti-skid control valve is provided in this pipeline. Vice versa permits a flow of compressed air toward the air chamber from 置側 are those provided with a one-way valve that prohibits.

[0006]

In the above-described anti-skid control device of the present invention, since the conduit for connecting the anti-skid control device side and the air chamber side is provided, not only the compressed air supplied from the relay valve to the air chamber but also the brake is provided. Compressed air discharged by the valve can be directly supplied to the air chamber from the conduit.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a piping system diagram of an anti-skid control device in this embodiment.

In FIG. 1, reference numeral 1 denotes a driver-operated brake valve, to which compressed air is supplied from an air reservoir (not shown) through a pipe line. When the pedal 2 of the brake valve 1 is depressed, the compressed air supplied to the brake valve 1 from an air reservoir (not shown) discharges compressed air having a pressure proportional to the depression, and is supplied to the relay valve 4 through the conduit 3. In the line 3 between the brake valve 1 and the relay valve 4, an anti-skid control valve device 5 is provided, which is of a known type and is A loosening position (a position where the communication between the brake valve 1 and the relay valve 4 is cut off and the relay valve 4 is communicated with the atmosphere) in response to a loosening command, a holding command and a loading command from the discriminating circuit 6 that monitors the rotation state. ), A holding position (a position where the communication between the brake valve 1 and the relay valve 4 is cut off and the pressure inside the relay valve 4 is kept constant), and a retracted position (where the brake valve 1 and the relay valve 4 communicate with each other, the relay valve 4 It can be switched to each position where pressure is supplied.

An air reservoir 7 is supplied with compressed air from a compressor (not shown) through a pipe line. Compressed air from the air reservoir 7 is supplied to the relay valve 4 through the conduit 8. The relay valve 4 is connected to a plurality of air chambers 11 and 12 (brake actuators) through a pipe line 9 and a pipe line 10 branching from the pipe line 9 and responds to the output pressure of the anti-skid control valve device 5 according to the output pressure. , A communication position (a position where the air reservoir 7 is communicated with the air chambers 11 and 12 to change the amount of compressed air to the air chamber), and a holding position (the air reservoir 7 and the air chambers 11 and 12).
12 to communicate with the air chamber so that the amount of compressed air to the air chamber is constant), and open position (the communication between the air reservoir 7 and the air chambers 11 and 12 is cut off).
12 are communicated with the atmosphere).

In this anti-skid control device, the relay valve 4 and the chamber 1 are branched off from the pipe line 3 between the anti-skid control valve device 5 and the relay valve 4.
The bypass line 13 is connected to the line 9 between the first and the second passages 12, and the flow of the compressed air from the anti-skid control valve device 5 side toward the air chambers 11 and 12 is provided in the bypass line 13. One-way valve 1 that allows
4 is provided.

The antiskid controller according to the embodiment of the present invention is constructed as described above. Next, the operation of the antiskid controller will be described.

When the brake is not applied,
The anti-skid control valve device 5 is in the above-mentioned loading position, and the relay valve 4 is in the above-mentioned opening position.

In order to apply the brake when the vehicle is running,
When the driver depresses the brake pedal 2, compressed air having a pressure proportional to the depression is supplied to the relay valve 4 through the conduit 3 and the anti-skid control valve device 5 in the brake valve 1, and the bypass conduit 13, It is supplied to the air chambers 1 and 12 directly through the one-way valve 14 and the lines 9 and 10. At this time, the relay valve 4
The pressure of compressed air corresponding to the output pressure of the anti-skid control valve device 5 is switched to the above-mentioned communication position for supplying the air chambers 11 and 12, and the compressed air is supplied from the air reservoir 7 to the air chambers 11 and 12 through the pipes 8 and 9. Supply. As a result, the air chambers 11 and 12 that receive the compressed air from the brake valve 1 and the air reservoir 7 operate,
The wheels are braked.

At this time, if an unacceptable large slip occurs on the wheels, that is, if the wheels are about to be locked, the discrimination circuit 6 detects this. Then, the discrimination circuit 6
Adjusts the pressure of the compressed air supplied to the air chambers 11 and 12, so that the anti-skid control valve device 5 is switched to the slack position or the holding position to prevent the wheels from being locked.

When the antiskid control valve device 5 is switched to the slack position, the relay valve 4 is communicated with the atmosphere, and the compressed air supplied to the relay valve 4 and the antiskid control valve device 5 are in one direction. Along with the compressed air existing between the valves 14, the anti-skid control valve device 5 is discharged into the atmosphere. As a result, the relay valve 4 is switched to the open position, the compressed air supplied to the air chambers 11 and 12 is discharged from the relay valve 4 into the atmosphere, and the wheels are prevented from being locked.

When the anti-skid control valve device 5 is switched to the holding position, the break valve 1 and the relay valve 4, the brake valve 1 and the air chambers 11 and 12 are cut off, and the one-way valve 14 is disconnected. The pressure of the compressed air directly supplied to the air reservoirs 11 and 12 and the pressure of the compressed air supplied to the relay valve 4 are kept constant without increasing. Then, the relay valve 4 comes to the holding position, and the air reservoir 7 moves to the air chambers 11, 12
The compressed air supplied to is also set to a constant pressure. As a result, the pressure of the compressed air directly supplied from the one-way valve 14 to the air chambers 11 and 12 and the pressure of the compressed air supplied from the air reservoir 7 to the air chambers 11 and 12 are kept constant without increasing. Avoid locking the wheels.

As described above, according to this embodiment, the bypass conduit 13 is provided to connect the antiskid control valve device 5 and the air chambers 11 and 12 with the one-way valve 14 interposed therebetween.
Not only the compressed air supplied from the relay valve to the air chambers 11 and 12 but also the compressed air discharged from the brake valve 1 can be directly supplied to the air chambers 11 and 12 through the bypass line 13. It is possible to eliminate the delay in operation at the same time and relay valve 4
Even if there is hysteresis in itself, fine control is possible.

Further, by interposing the one-way valve 14 in the bypass line 13, only the compressed air from the one-way valve to the anti-skid control valve device is released to the atmosphere by the anti-skid control valve device when the brake is loosened. Since the compressed air discharged into the air chambers 11 and 12 is discharged into the atmosphere by the relay valve 4, the operation at the time of brake slackening can be performed quickly.

[0020]

As described above in detail, according to the anti-skid control device of the present invention, the conduit for connecting the anti-skid control valve device and the air chamber with the one-way valve interposed is provided. Since not only compressed air supplied from the relay valve to the air chamber but also compressed air discharged from the brake valve can be directly supplied to the air chamber through this pipe line, the operation delay at the time of braking can be eliminated. At the same time, even if the relay valve itself has hysteresis, fine control becomes possible.

Further, since the one-way valve is interposed in the conduit connecting the anti-skid control valve device and the air chamber, only compressed air from the one-way valve to the anti-skid control valve device is released when the brake is released. Is discharged into the atmosphere by the anti-skid control valve device, and the compressed air in the air chamber is discharged into the atmosphere by the relay valve, so that the operation at the time of brake slack can be performed quickly.

[Brief description of drawings]

FIG. 1 is a piping system diagram showing an anti-skid control device as one embodiment of the present invention.

[Explanation of symbols]

 1 Brake valve 4 Relay valve 5 Anti-skid control valve device 6 Discrimination circuit 7 Air reservoir 11, 12 Air chamber 13 One-way valve

Claims (1)

[Claims] 1. A brake valve that discharges compressed air according to an operation amount of a driver, a relay valve that discharges air pressure stored in an air reservoir according to the air pressure of compressed air supplied from the brake valve, Supplying to the relay valve in response to a command from a plurality of air chambers that are supplied with air pressure from the relay valve and perform a braking action, and a determination circuit that is provided between the brake valve and the relay valve and that monitors the behavior of the wheels In an anti-skid control device provided with an anti-skid control valve device for controlling the air pressure to be provided, a pipe line that connects the anti-skid control valve device side of the relay valve and the air chamber side is provided, and in this pipe line While allowing the flow of compressed air from the anti-skid control valve device side toward the air chamber, and vice versa Anti-skid control device with directional valve.