KR100279442B1 - Proportioning Valve for Braking System - Google Patents

Abstract

An object of the present invention is to provide a proportioning valve for a braking device to control the EBD during normal operation to obtain the maximum braking performance irrespective of the loading state, to ensure braking stability even in the event of ABS failure.

The proportioning valve for the brake device according to the present invention is configured to be supplied to the rear brake by being supplied with the hydraulic pressure from the master cylinder and controlled by the hydraulic pressure, or to directly supply the hydraulic pressure to the rear brake. Valve body is installed on the pipeline for supplying the;

The valve body is controlled by the electronic control unit (ECU) to control and supply the hydraulic pressure supplied from the master cylinder by the EBD to the rear brake in the normal operation of ABS, and directly supply the hydraulic pressure supplied from the master cylinder to the rear brake in the event of ABS failure. It comprises a controlled solenoid valve.

Description

Proportioning Valve for Braking System

The present invention relates to a braking device of a vehicle, and more particularly, to obtain a maximum braking performance regardless of the loading state of the vehicle in the normal operation of ABS, and acts like a conventional proportioning valve in the case of ABS failure A proportioning valve for a braking device to ensure braking stability.

In general, a proportioning valve used in a braking device is a valve that adjusts the rear brake hydraulic pressure so that the rear wheel does not stop prematurely when the brake pedal is operated.

This brake hydraulic pressure is proportional to the hydraulic pressure of the master cylinder, but this proportioning valve prevents the hydraulic pressure of the master cylinder from becoming too large. The ideal distribution of the front and rear wheel braking force varies when the vehicle is large and small, so the weight change of the vehicle Change the start point of the front and rear brakes so that the

The proportioning valve is configured and connected to block the hydraulic pressure of the master cylinder from being connected to the wheel cylinder of the rear wheel when the ABS is operated.

However, when the above-described proportioning valve is applied to the existing ABS, the proportioning valve, as shown in FIG. 5, maximizes the frictional force generated from the tire and the road surface when riding one or two persons (a). Although it is possible to obtain the maximum braking performance by using, the rear wheel hydraulic pressure is reduced in the maximum loading condition (b) is not enough to obtain a rear wheel braking force necessary for increasing the rear wheel weight.

Therefore, in order to obtain the maximum braking performance at the time of riding (a) as well as at maximum load conditions (b), the standard ABS system eliminates the above-described proportioning valve and electronically controls the rear brake hydraulic pressure. (Electronic Brake Distribution) system, but this EBD does not operate in case of ABS failure, as shown in Fig. 6, so the rear brake lock phenomenon is preceded by the brakes due to the vehicle crossing the lane during braking. There is a disadvantage in reducing the safety.

Therefore, the present invention was created to solve the above and disadvantages, the object of the present invention is to control the EBD in the normal operation of ABS to obtain the maximum braking performance regardless of the loading state, to ensure the braking stability even in the event of ABS failure A proportioning valve for a braking device is provided.

In order to realize this, the proportioning valve for the braking device according to the present invention is

A valve body provided on a conduit configured to receive hydraulic pressure from the master cylinder and to be supplied to the rear brake while being controlled by the hydraulic pressure or to supply the hydraulic pressure directly to the rear brake;

The valve body is controlled by the electronic control unit (ECU) to directly supply the hydraulic pressure supplied from the master cylinder by the EBD to the rear brake when the ABS body is in normal operation, and directly supply the hydraulic pressure supplied from the master cylinder to the rear brake by the ABS. And a flow path switching means that is controlled.

In the proportioning valve for a brake device configured as described above, the flow path switching means controls the valve body, and controls and directly supplies the hydraulic pressure supplied from the master cylinder to the rear brake in accordance with the normal and fixed ABS.

BEST MODE Hereinafter, preferred configurations and operations of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a proportioning valve for a braking device according to the present invention.

2 is a block diagram for controlling a solenoid of a proportioning valve for a braking device according to the present invention;

Fig. 3 is a graph showing a relationship between front wheel brake hydraulic pressure and rear wheel brake hydraulic pressure when ABS with a braking device proportioning valve according to the present invention operates normally.

Fig. 4 is a graph showing the relationship between front wheel brake hydraulic pressure and rear wheel brake hydraulic pressure when ABS with a braking device proportioning valve according to the present invention fails;

5 is a graph showing a relationship between front wheel brake hydraulic pressure and rear wheel brake hydraulic pressure when a conventional proportioning valve is applied.

6 is a graph showing the relationship between the front wheel brake hydraulic pressure and the rear wheel brake hydraulic pressure when the conventional EDB system is applied.

<Explanation of symbols for main parts of the drawings>

M / C: Stud cylinder R / B: Rear brake 1: Proportioning valve 3: Valve body

5: Solenoid valve 7, 9, 11: 1st, 2, 3 chamber 13: Cylinder 17: Piston 19: Oil passage

1 is a cross-sectional view of a proportioning valve for a braking device according to the present invention, in which a proportioning valve 1 is provided on a conduit connecting a master cylinder M / C and a rear brake R / B. .

This proportioning valve 1 is largely comprised of the valve body 3 and the solenoid valve 5 which is a flow path switching means.

The valve body 3 is configured to receive the hydraulic pressure from the master cylinder (M / C) to be supplied to the rear brake (R / B), in particular the valve body 3 is controlled by the hydraulic pressure controlled hydraulic pressure Is supplied to the rear brakes R / B, or the hydraulic pressure is directly supplied to the rear brakes R / B.

There can be any number of the valve body 3 which can perform such a function, and it includes all such things, but this example illustrates only one example.

That is, the valve body 3 is provided in the side of the master cylinder M / C in the pipeline which connects the master cylinder M / C and the rear brake R / B, and is located inside the master cylinder M / C. It consists of a cylinder (13) forming the first, second, third chambers (7, 9, 11) acting on the hydraulic pressure generated from) and the housing (15) forming the cylinder (13).

The cylinder 13 has a built-in piston 17 capable of linearly reciprocating by forming the first, second, third chambers 7, 9, 11.

The piston 17 may directly supply the hydraulic pressure supplied from the master cylinder M / C to the rear brake R / B, and may be controlled by some hydraulic pressure supplied to the rear brake R / B to control the hydraulic pressure. It is connected to the solenoid valve (5) so that the control supply.

The piston 17 has an oil passage 19 formed in the longitudinal direction of the piston 17 so as to directly supply the hydraulic pressure supplied from the master cylinder M / C to the rear brake R / B.

In addition, an elastic member 21 supporting the piston 17 is installed at the first chamber 7 side to which the hydraulic pressure of the master cylinder M / C is supplied, and a protrusion capable of opening and closing the oil passage 19. 23) is formed to protrude.

On the other hand, the flow path switching means exemplifies the solenoid valve 5 in this configuration, but as shown in FIG. 2, the master cylinder (M / C) is controlled by the electronic control unit (ECU) according to the failure of ABS. It includes all that can supply or control the hydraulic pressure supplied from the direct to the rear brake (R / B).

Therefore, the solenoid valve 3 is configured to be controlled on / off under the control of the electronic control unit ECU to enable the above operation.

That is, the solenoid valve 3 is connected to receive the hydraulic pressure to the third chamber 11, and supplies the hydraulic pressure supplied to the third chamber 11 to the second chamber 9, and after the control the rear brake It is connected to supply to (R / B) or directly to rear brake (R / B).

The solenoid valve 3 then forms a circuit to operate in conjunction with a warning light 25 that informs the driver of the ABS failure.

When the braking device provided with the braking device proportioning valve 1 configured as described above is operated, the electronic control unit ECU determines whether the ABS has failed.

At this time, when it is determined that ABS is normally operated, the electronic control unit ECU turns off the solenoid valve 3 to control the state as a.

Therefore, the hydraulic pressure supplied from the master cylinder M / C is supplied to the solenoid valve 5 through the first chamber 7, the oil passage 19 of the piston 17, and the third chamber 11. At this time, since the solenoid valve 3 is controlled as a, a part of the hydraulic pressure supplied from the third chamber 11 is supplied to the rear brake R / B via the second chamber 9 to operate the rear brake. Let's do it.

Therefore, the rear brake (R / B) hydraulic pressure and the front brake (not shown) hydraulic pressure are controlled as shown in Fig. 3, so that the maximum braking performance is obtained regardless of the vehicle loading conditions.

On the other hand, when it is determined that ABS is fixed, the electronic control unit ECU turns on the solenoid valve 3 to control it in the same state as b.

Therefore, the hydraulic pressure supplied from the master cylinder M / C is supplied to the solenoid valve 5 through the first chamber 7, the oil passage 19 of the piston 17, and the third chamber 11. At this time, since the solenoid valve 3 is controlled as b, the hydraulic pressure supplied from the third chamber 11 is supplied to the rear brake R / B as it is to operate.

Therefore, the rear brake (R / B) hydraulic pressure and the front brake (not shown) hydraulic pressure are controlled as shown in FIG. 4, so as to secure operating door braking stability as in the conventional proportioning valve.

As described above, in the proportioning valve for the brake device according to the present invention, since the flow path switching means controls the valve body, the hydraulic pressure supplied from the master cylinder to the rear brake is controlled and supplied directly according to the normal and fixed ABS. In normal operation, the maximum braking performance is obtained regardless of the loading state, and the braking stability can be secured even in case of ABS failure.

Claims (4)

A valve body configured to be supplied with a hydraulic pressure from a master cylinder to be supplied to the rear brake while being controlled by the hydraulic pressure, or to be configured to supply the hydraulic pressure directly to the rear brake and installed on a conduit supplying hydraulic pressure from the master cylinder to the leader brake; The flow path for controlling the valve body by the electronic control unit (ECU) to control and supply the hydraulic pressure supplied from the master cylinder to the rear brake in the normal operation of ABS, and to supply the hydraulic pressure from the master directly to the rear brake in the case of ABS failure. In a proportioning valve for a braking device comprising a switching means, The valve body is provided with a cylinder which is provided on the conduit connecting the master cylinder and the rear brake to form a plurality of chambers therein; The hydraulic pressure supplied to the rear brake is directly supplied to the rear brake built in the cylinder formed in the housing, and a part of the hydraulic pressure supplied to the rear brake is supplied by the flow path switching means so that the hydraulic pressure can be controlled and supplied by the hydraulic pressure. A proportioning valve for a braking device comprising a piston formed. The proportioning valve according to claim 1, wherein the piston forms an oil passage in the longitudinal direction of the piston so that the hydraulic pressure supplied from the master cylinder can be directly supplied to the rear brake. The proportioning valve of claim 1, wherein the flow path switching means comprises a solenoid valve controlled on and off by an electronic control unit (ECU) according to a failure of ABS. 4. The proportioning valve of claim 3, wherein the solenoid valve forms a circuit to operate with an ABS fault warning light.

Images