JP4832420B2 - Brake hydraulic pressure control device for vehicles - Google Patents

Description

  According to the present invention, the hydraulic pressure output from the output port of the master cylinder is sucked in accordance with the operation of the brake operating member, and the hydraulic pressure increased from the hydraulic pressure output from the output port is applied to the wheel brake. A pump capable of discharging as much as possible, and a normally closed electromagnetic provided between the output port and the suction side of the pump so that the pump can suck brake fluid from the output port when the valve is opened The present invention relates to a brake fluid pressure control device for a vehicle including a valve.

Between the output port of the master cylinder and the suction side of the pump, a first suction valve that closes in response to the hydraulic pressure output from the output port and a normally closed solenoid valve that is connected in parallel to the first suction valve. A vehicle brake hydraulic pressure control device provided with a second suction valve is known from Patent Document 1.
JP 2001-63542 A

  However, in the brake fluid pressure control device disclosed in Patent Document 1 described above, a fluid pressure higher than the fluid pressure output from the output port of the master cylinder is applied to the wheel brake while the vehicle driver is performing a brake operation. When the pump is operated by opening the second suction valve in order to act, the pulsation of the pump or the pulsation when the second suction valve is driven to open propagates to the master cylinder side. Brake operation feeling may be hindered.

  The present invention has been made in view of such circumstances, and at the time of brake assist in which a hydraulic pressure higher than the hydraulic pressure output from the output port of the master cylinder is applied to the wheel brake, the pulsation of the pump and the normally closed solenoid valve An object of the present invention is to provide a brake fluid pressure control device for a vehicle that suppresses the propagation of pulsation due to the operation of the above to the master cylinder side and enhances the brake operation feeling.

To achieve the above Symbol object, a first aspect of the present invention, from the fluid pressure output from the output port as well as the suction hydraulic pressure output from the output port of the master cylinder in response to operation of the brake operating member A pump capable of discharging the increased hydraulic pressure to act on the wheel brake, and the output port so that the pump can suck brake fluid from the output port when the valve is opened. In a vehicular brake hydraulic pressure control device including a normally closed solenoid valve provided between the suction sides of the pump, an orifice is interposed between the output port and the normally closed solenoid valve, and the fluid from the output port Allow the brake fluid to flow from the output port to the suction side of the pump in response to a decrease in hydraulic pressure between the orifice and the normally closed solenoid valve in the pressure output state. Off valve, characterized in that provided between the suction side of the orifice and the normally closed said output port and said pump is in parallel with the series circuit consisting of the solenoid valve.

Furthermore, the invention described in claim 2 is characterized in that, in addition to the configuration of the invention described in claim 1 , the normally closed electromagnetic valve is a linear solenoid valve.

According to the present invention , an orifice is interposed between the output port and the normally closed solenoid valve, and an output is made in response to a decrease in the fluid pressure between the orifice and the normally closed solenoid valve in a fluid pressure output state from the output port. Since the opening / closing valve that allows the flow of brake fluid from the port to the pump suction side is provided between the output port and the pump suction side in parallel with the series circuit including the orifice and the normally closed solenoid valve, Fluid pressure fluctuation on the suction side of the pump when the normally closed solenoid valve is opened and the pump is operated at the time of brake assist, which applies hydraulic pressure higher than the hydraulic pressure output from the output port of the wheel to the wheel brake Accordingly, the opening and closing of the opening and closing valve can suppress the propagation of the pulsation of the pump and the pulsation during the opening operation of the normally closed solenoid valve to the master cylinder. It is possible to increase the person of the brake operation feeling.

In particular , according to the second aspect of the present invention, the pulsation during the operation of the normally closed solenoid valve can be reduced by using the normally closed solenoid valve as a linear solenoid valve.

Hereinafter, embodiments of the present invention will be described based on reference examples shown in the accompanying drawings and examples of the present invention.

First, a reference example will be described with reference to FIG. 1. A brake operation force generated by a passenger's brake operation is input to a tandem master cylinder M from a brake pedal 1 which is a brake operation member. This master cylinder M has a first output port 3 corresponding to the left front wheel brake BA and the right rear wheel brake BB, and a second output corresponding to a right front wheel brake and a left rear wheel brake (not shown). The first and second output ports 3, 4 are connected to the wheel brakes BA, BB... Via the hydraulic pressure control unit 5.

  The portion on the first output port 3 side and the portion on the second output port 4 side of the hydraulic pressure control unit 5 have the same configuration. Hereinafter, the first output port 3 side of the hydraulic pressure control unit 5 will be described. Only the portion will be described, and the description of the portion on the second output port 4 side in the hydraulic pressure control unit 5 will be omitted.

  The hydraulic pressure control unit 5 includes a hydraulic pressure path 6 common to the left front wheel brake BA and the right rear wheel brake BB, and a regulator valve interposed between the hydraulic pressure path 6 and the first output port 3. 7, an inlet valve 8 interposed between the hydraulic pressure path 6 and the left front wheel wheel brake BA, an inlet valve 9 interposed between the hydraulic pressure path 6 and the right rear wheel wheel brake BB, A single reservoir 13 common to the left front wheel brake BA and the right rear wheel brake BB, an outlet valve 10 interposed between the left front wheel brake BA and the reservoir 13, and a right rear wheel An outlet valve 11 interposed between the brake BB and the reservoir 13, a pump 15 having a suction side connected to the reservoir 13 via a one-way valve 14 and a discharge side connected to the hydraulic pressure path 6, The suction side of the pump 15 And a one-way valve 17 and the normally closed electromagnetic valve 18 is provided between the fine one-way valve 14 between a first output port 3. The pump 15 is driven by an electric motor 16, and the electric motor 16 is common to a portion on the first output port 3 side and a portion on the second output port 4 side of the hydraulic pressure control unit 5. .

  The one-way valve 17 is interposed between the first output port 3 and the normally closed solenoid valve 18 so as to allow the brake fluid to flow from the first output port 3 to the normally closed solenoid valve 18 side. The closed solenoid valve 18 is interposed between the one-way valve 17 and the suction side of the pump 15. Moreover, the flow resistance of the one-way valve 17 when the brake fluid flows from the first output port 3 to the normally closed solenoid valve 18 side is set to be smaller than the flow resistance of the normally closed solenoid valve 18 in the opened state. ing.

  The regulator valve 7 and the inlet valves 8, 9 are normally open linear solenoid valves, and the outlet valves 10, 11 are normally closed linear solenoid valves.

  Further, a hydraulic pressure sensor 19 for detecting the output hydraulic pressure of the master cylinder M is connected between the first output port 3 and the regulator valve 7, and the inlet valves 8 and 9, the left front wheel brake BA and the right rear wheel are connected. The hydraulic pressure sensors 20 and 21 for detecting the brake hydraulic pressure acting on the left front wheel brake BA and the right rear wheel brake BB are connected to the vehicle wheel brake BB, respectively.

  The regulator valve 7, the inlet valves 8 and 9, the outlet valves 10 and 11, the electric motor 16 and the normally closed electromagnetic valve 18 of the hydraulic pressure control unit 5 are controlled by the controller C. Detection values of the respective hydraulic pressure sensors 19 to 21 are input.

  In such a hydraulic control unit 5, during service braking, the operation of the electric motor 16 is stopped, the regulator valve 7 is opened, and the normally closed electromagnetic valve 18 is closed.

  Thus, at the time of anti-lock brake control when the left front wheel is about to be locked due to the operation of the left front wheel brake BA, the inlet valve 8 is opened and the outlet valve 10 is closed so that the liquid A pressure increasing mode for connecting the pressure path 6 and the left front wheel brake BA and the left front wheel brake BA and the reservoir 13; closing the inlet valve 8 and opening the outlet valve 10; By closing the hydraulic pressure path 6 and the front left wheel brake BA, the pressure reducing mode for connecting the front left wheel brake BA and the reservoir 13, and closing the inlet valve 8 and the outlet valve 10 together. Switching the holding mode for shutting off the hydraulic pressure path 6 and the reservoir 13 from the left front wheel brake BA causes the left front wheel to enter a locked state. It is avoided.

  When the anti-lock brake control is performed when the right rear wheel is about to be locked due to the operation of the right rear wheel brake BB, the inlet valve 9 is opened and the outlet valve 11 is closed so that the liquid A pressure increasing mode in which the pressure path 6 and the right rear wheel wheel brake BB are connected and the right rear wheel wheel brake BB and the reservoir 13 are disconnected. The inlet valve 9 is closed and the outlet valve 11 is closed. By opening the valve, the pressure reducing mode in which the hydraulic pressure path 6 and the right rear wheel wheel brake BB are disconnected and the right rear wheel wheel brake BB and the reservoir 13 are connected, and the inlet valve 9 and the outlet valve 11 are connected. When both are closed, the holding mode for shutting off the hydraulic pressure path 6 and the reservoir 13 from the right rear wheel wheel brake BB is switched, and the right rear wheel falls into a locked state. There is avoided.

  Moreover, during the anti-lock brake control, the pump 15 is driven by the electric motor 16 with the regulator valve 7 opened and the normally closed electromagnetic valve 18 closed. The brake fluid stored in the reservoir 13 is returned to the hydraulic pressure path 6 by opening the valve.

  The hydraulic pressure control unit 5 activates the electric motor 16 with the normally closed solenoid valve 18 excited and opened during the brake operation when the brake pedal 1 is depressed, so that the pump 15 is connected to the master cylinder M. 1 The brake fluid sucked and pressurized from the output port 3 is discharged to the hydraulic pressure path 6 between the regulator valve 7 and the inlet valves 8 and 10, and the operation of the regulator valve 7 is controlled to control the hydraulic pressure path 6. The hydraulic pressure can be adjusted. That is, the hydraulic pressure control unit 5 performs brake assist that causes the brake hydraulic pressure increased from the hydraulic pressure output from the master cylinder M to act on the left front wheel brake BA and the right rear wheel brake BB. Can be executed.

Next, the operation of this reference example will be described. Between the first output port 3 of the master cylinder M and the suction side of the pump 15, a normally closed solenoid valve 18 and a normally closed solenoid valve 18 from the first output port 3 are provided. A one-way valve 17 interposed between the first output port 3 and the normally closed solenoid valve 18 is provided so as to allow the brake fluid to flow to the side, and the normally closed type is provided from the first output port 3. The flow resistance of the one-way valve 17 when the brake fluid flows to the electromagnetic valve 18 side is set to be smaller than the flow resistance of the normally closed electromagnetic valve 18 in the open state.

  Therefore, the pulsation of the pump 15 is applied at the time of brake assist in which a hydraulic pressure higher than the hydraulic pressure output from the first output port 3 of the master cylinder M is applied to the left front wheel brake BA and the right rear wheel brake BB. In addition, the one-way valve 17 can suppress the pulsation during the opening operation of the normally closed solenoid valve 18 from being transmitted to the master cylinder M side, and the brake operation feeling of the vehicle driver can be enhanced.

Figure 2 shows the actual施例of the present invention, the parts corresponding to the reference example and shown only by the same reference numerals, and detailed description thereof will be omitted.

  An orifice 25 is interposed between the first output port 3 of the master cylinder M and the normally closed solenoid valve 18 which is a linear solenoid valve, and between the first output port 3 and the suction side of the pump 15, An opening / closing valve 26 is provided in parallel with a series circuit including the orifice 25 and the normally closed electromagnetic valve 18. The on-off valve 26 includes a valve housing 27, a valve body 28 that is slidably fitted to the valve housing 27, and a spring 29 that biases the valve body 28.

  In the valve housing 27, a valve seat 31 is formed between a valve hole 30 that passes through one end of the master cylinder M that communicates with the first output port 3 and the other end of the valve hole 30. A sliding hole 32 that is coaxially connected, and a screw hole 33 that is larger in diameter than the sliding hole 32 and that is coaxially connected to the sliding hole 32 on the opposite side of the valve hole are provided. The valve hole 30 is formed in a tapered shape so as to face the center.

  The valve body 28 is slidably fitted into the sliding hole 32, and an O-ring shaped sealing member 34 that is in sliding contact with the inner surface of the sliding hole 32 is mounted on the outer periphery of the valve body 28. The In addition, one end of the valve body 28 is provided with a seat portion 28a formed in a tapered shape so as to be seated on the valve seat 31, and the valve seat 31 is interposed between one end of the valve housing 27 and the valve body 28. A valve chamber 35 to be exposed is formed, and this valve chamber 35 is connected to the suction side of the pump 15.

  A closing member 36 is screwed into the large-diameter hole 33, and an O-ring 37 is interposed between the valve housing 27 and the closing member 36. Thus, a pilot chamber 38 is formed in the valve housing 27 between the other end of the valve body 28 and the closing member 36, and the spring 29 is accommodated in the pilot chamber 38 and is interposed between the valve body 28 and the closing member 36. It is reduced.

  The valve housing 27 extends in a direction perpendicular to the valve hole 30 and communicates with the valve hole 30 at one end thereof, and extends in parallel with the axis of the valve hole 30 and the sliding hole 32 and the first passage 39. A second passage 40 that communicates with one passage 39 at one end, and a third passage 41 that extends parallel to the first passage 39 to cross the second passage 40 and communicates one end with the pilot chamber 38; The other end of the first passage 39 opened to the outer surface of the valve housing 27 is liquid-tightly closed by a closing member 42, and the other end of the second passage 40 opened to the outer surface of the valve housing 27 is liquid-tightly closed by a ball 43. The The orifice 25 is press-fitted into the first passage 39 between the second passage 40 and the valve hole 31, and the other end of the second passage 40 is connected to the normally closed electromagnetic valve 18. That is, the hydraulic pressure between the orifice 25 and the normally closed electromagnetic valve 18 acts on the pilot chamber 38.

  In such an on-off valve 26, the hydraulic pressure due to the hydraulic pressure in the pilot chamber 38 and the spring force of the spring 29 become a valve closing force that urges the valve body 28 toward the valve seat 31, that is, the valve closing side. In the seating state of the valve seat 31 on the valve seat 31, the valve opening force that biases the valve body 28 away from the valve seat 31, ie, the valve opening side, by the fluid pressure of the valve hole 31 and the fluid pressure of the valve chamber 35. It becomes.

  Thus, at the time of non-braking operation with the normally closed solenoid valve 18 closed, the on-off valve 26 is closed by the spring force of the spring 29, and the first output port 3 of the master cylinder M is accompanied by the braking operation. When the hydraulic pressure is output from the valve, the hydraulic pressure in the valve hole 31 and the pilot chamber 38 is the same, and the on-off valve 26 is closed.

  When the brake assist is performed, the normally closed solenoid valve 18 is opened while the hydraulic pressure is output from the first output port 3 of the master cylinder M, and the pump 15 is operated when the pump 15 is operated. The hydraulic pressure between the orifice 25 and the normally closed electromagnetic valve 18, that is, the hydraulic pressure in the pilot chamber 38 changes according to the repetition of the above, and the on-off valve 26 changes in response to such a change in the hydraulic pressure in the pilot chamber 38. The valve closing state and the valve opening state in which the brake fluid from the first output port 3 flows to the pump 15 side are repeated. That is, during the suction operation of the pump 15, the hydraulic pressure between the orifice 25 and the normally closed solenoid valve 18, that is, the hydraulic pressure in the pilot chamber 38 is lowered below the hydraulic pressure in the valve hole 30 by the action of the orifice 25. The brake fluid from the first output port 3 flows to the pump 15 side when the valve is opened, and the hydraulic pressure between the orifice 25 and the normally closed solenoid valve 18 is the same as the hydraulic pressure in the valve hole 30 when the pump 15 discharges. The on-off valve 26 is closed by the pressure, and the on-off valve 26 responds to a decrease in the hydraulic pressure between the orifice 25 and the normally closed solenoid valve 18 in a hydraulic pressure output state from the first output port 3. The brake fluid is allowed to flow from the first output port 3 to the suction side of the pump 15.

According to the actual施例, during braking assist exerting a high hydraulic pressure than the hydraulic pressure outputted from the first output port 3 of the master cylinder M to the left front wheel brake BA and the right rear wheel brake BB, When the normally closed solenoid valve 18 is opened and the pump 15 is operated, the on-off valve 26 opens and closes according to the fluid pressure fluctuation on the suction side of the pump 15, thereby pulsating the pump 15 and the normally closed solenoid valve. It is possible to suppress the pulsation at the time of the valve opening operation of 18 from being propagated to the master cylinder M side, and the brake operation feeling of the vehicle driver can be enhanced.

  In addition, the normally closed solenoid valve 18 is a linear solenoid valve and has a very small flow area. Therefore, pulsation during operation of the normally closed solenoid valve 18 can be reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is .

It is a hydraulic system diagram of a vehicle brake hydraulic pressure control device of a reference example. It is a principal part hydraulic pressure system diagram of the brake fluid pressure control device for vehicles of the example of the present invention .

DESCRIPTION OF SYMBOLS 1 ... Brake pedal 3 as a brake operation member ... Output port 15 ... Pump 17 ... One-way valve 18 ... Normally closed solenoid valve 25 ... Orifice 26 ... Opening / closing Valve BA ... Wheel brake for left front wheel BB ... Wheel brake for right rear wheel M ... Master cylinder

Claims (2)

Is boosted than the fluid pressure output from the output port (3) with inhaled hydraulic pressure output from the output port of the master cylinder (M) (3) in response to the operation of the brake operating member (1) The pump (15) capable of discharging the hydraulic pressure applied to the wheel brakes (BA, BB), and the pump (15) sucks the brake fluid from the output port (3) when the valve is opened. In a vehicle brake hydraulic pressure control device comprising a normally closed solenoid valve (18) provided between the output port (3) and the suction side of the pump (15) in such a manner that
An orifice (25) is interposed between the output port (3) and the normally closed solenoid valve (18), and the orifice (25) and the normally closed type are in a hydraulic pressure output state from the output port (3). An on-off valve (26) that allows the brake fluid to flow from the output port (3) to the suction side of the pump (15) in response to a decrease in the hydraulic pressure between the solenoid valves (18), the orifice (25) and The vehicle brake hydraulic pressure control device is provided between the output port (3) and the suction side of the pump (15) in parallel with a series circuit including the normally closed solenoid valve (18). The vehicular brake hydraulic pressure control device according to claim 1, wherein the normally closed solenoid valve (18) is a linear solenoid valve.

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