JP2006137221A - Braking hydraulic pressure control device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make operation feeling better by securing an operation stroke of a brake operation member at the time of regenerative and cooperative brake control in a braking hydraulic pressure control device for a vehicle capable of executing the regenerative and cooperative brake control controlling the braking hydraulic pressure of a wheel braking mounted to a driving wheel so as to reduce the amount of frictional braking by the amount of the regenerative braking torque in reducing the speed. <P>SOLUTION: In the braking hydraulic pressure control device for the vehicle, a stroke absorbing means 21A where a reservoir 12 and a control valve 22 for adjusting the stroke which is in a closed state in non-regenerative and cooperative braking but is opened in the regenerative and cooperative braking are connected to a master cylinder M. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle brake fluid pressure control device, and more particularly to a friction brake component corresponding to a regenerative brake torque when regenerative power generation is performed at the time of deceleration in a hybrid vehicle, a fuel cell vehicle, and the like in which driving force is obtained by an electric motor. The present invention relates to an improvement in a brake fluid pressure control device for a vehicle capable of executing regenerative cooperative brake control in which the brake fluid pressure of a wheel brake mounted on a drive wheel is controlled to reduce the vehicle brake pressure.

A brake fluid pressure control device that enables regenerative cooperative brake control is already known, for example, from Patent Document 1.
Japanese Patent Laid-Open No. 7-336085

  However, in the above-described conventional one, the operation stroke of the brake operation member is reduced due to the reduction of the friction brake at the time of regenerative cooperative brake control, and the operation feeling changes, so the vehicle driver may feel uncomfortable.

  The present invention has been made in view of such circumstances, and the brake hydraulic pressure control device for a vehicle that can secure an operation stroke of the brake operation member during regenerative cooperative brake control to improve the operation feeling. The purpose is to provide.

  In order to achieve the above object, an invention according to claim 1 is connected to a master cylinder that outputs a hydraulic pressure corresponding to an operation of a brake operating member, and to guide the output hydraulic pressure of the master cylinder. A hydraulic pressure path, a reservoir capable of storing brake fluid, a pump capable of discharging brake fluid pumped up from the reservoir to the hydraulic pressure path, and a state in which the hydraulic pressure of the hydraulic pressure path is applied to a wheel brake, Control valve means capable of switching between a state in which the brake fluid pressure of the wheel brake is maintained and a state in which the brake fluid pressure of the wheel brake is released to the reservoir, and the brake fluid pressure of the wheel brake mounted on the drive wheel is regeneratively braked. In a vehicle brake hydraulic pressure control device that enables regenerative cooperative brake control that is controlled according to force, it is closed during non-regenerative cooperative brake control. Stroke absorbing means for adjustable stroke control valve and the reservoir, which is the valve opening control during the regeneration cooperative brake control in which a state is formed by connecting, characterized in that connected to the master cylinder.

  According to a second aspect of the present invention, the master cylinder is connected to the master cylinder via a master cylinder that outputs a hydraulic pressure corresponding to the operation of the brake operating member and a one-way valve that allows the brake fluid to flow only from the master cylinder side. A hydraulic path to be connected; a reservoir capable of storing brake fluid; a pump capable of discharging brake fluid pumped up from either the reservoir or the master cylinder to the hydraulic path; and a hydraulic pressure of the hydraulic path A pressure adjusting valve provided between the hydraulic pressure path and the master cylinder, a suction valve provided between the suction side of the pump and the master cylinder, and a wheel brake for adjusting the hydraulic pressure in the hydraulic pressure path. The state in which the brake fluid pressure of the wheel brake is maintained and the state in which the brake fluid pressure of the wheel brake is released to the reservoir can be switched. In a vehicle brake hydraulic pressure control device that is capable of regenerative cooperative brake control, wherein the brake hydraulic pressure of a wheel brake mounted on a drive wheel is controlled according to the regenerative brake force. Stroke absorbing means for absorbing surplus brake fluid generated in response to pressure reduction control of the brake fluid pressure of the wheel brake mounted on the wheel during the regenerative cooperative brake control is connected to the hydraulic pressure path.

  According to a third aspect of the present invention, in addition to the configuration of the second aspect of the invention, the stroke absorbing means has a stroke adjustment dedicated reservoir capable of pumping brake fluid by the pump, and is closed during non-regenerative cooperative brake control. Although it is in a state, it is connected to the hydraulic pressure path via a stroke adjustment control valve that is valve-opened during the regenerative cooperative brake control.

  According to a fourth aspect of the invention, in addition to the configuration of the second aspect of the invention, the stroke absorbing means opens the valve during the regenerative cooperative brake control although the reservoir is in a closed state during the non-regenerative cooperative brake control. It is characterized in that it is connected to the hydraulic pressure path via a controlled stroke adjustment control valve.

  According to a fifth aspect of the invention, in addition to the configuration of the second aspect of the invention, the stroke absorbing means is in a closed state when the accumulator capable of pumping brake fluid by the pump is in a non-regenerative cooperative brake control. However, it is connected to the hydraulic pressure path through a stroke adjustment control valve that is controlled to open during the regeneration cooperative brake control.

  According to a sixth aspect of the invention, in addition to the configuration of the second aspect of the invention, the stroke absorbing means includes an accumulator capable of absorbing a hydraulic load corresponding to a wheel brake attached to a drive wheel, the accumulator, It comprises a normally closed stroke adjusting control valve interposed between the hydraulic pressure paths, and a normally closed release valve interposed between the accumulator and the reservoir.

  Furthermore, in the invention according to claim 7, in addition to the configuration of the invention according to any one of claims 1 to 6, an accumulator capable of accumulating a part of the discharge hydraulic pressure of the master cylinder at the time of the regenerative cooperative brake control, Apart from the stroke absorbing means, it is connected to the master cylinder.

  According to the first aspect of the present invention, during regenerative cooperative brake control, the master cylinder can be communicated with the reservoir by opening the stroke adjustment control valve, and a part of the brake fluid discharged from the master cylinder can be discharged. By temporarily storing in the reservoir, the operation stroke of the brake operation member can be secured even during regenerative cooperative brake control, and a good operation feeling can be obtained. In addition, since the brake fluid pressure control reservoir by the control valve means is also used as a reservoir for ensuring the operation stroke, the number of parts can be reduced.

  According to the invention described in claim 2, when the brake is operated, the output hydraulic pressure of the master cylinder guided to the hydraulic pressure path via the one-way valve is applied to each wheel brake when the pump is deactivated. By opening the intake valve to operate the pump and adjusting the pressure adjusting valve, the output hydraulic pressure of the master cylinder can be increased to a predetermined hydraulic pressure and can be applied to each wheel brake from the hydraulic pressure path. However, in any state, at the time of regenerative cooperative brake control, excess brake fluid generated in the hydraulic pressure path can be absorbed by the stroke absorbing means in response to pressure-reducing control of the brake fluid pressure of the wheel brake attached to the drive wheel. Therefore, the operation stroke of the brake operation member can be ensured during regenerative cooperative brake control, and a good operation feeling can be obtained.

  According to the third aspect of the present invention, when the regenerative cooperative brake control is performed, the stroke adjustment control valve is opened to temporarily store the excess brake fluid generated in the hydraulic pressure path in the stroke adjustment dedicated reservoir. An operation stroke can be secured and a good operation feeling can be obtained.

  According to the fourth aspect of the present invention, when the regenerative cooperative brake control is performed, the stroke adjusting control valve is opened to temporarily store the surplus brake fluid generated in the hydraulic path in the reservoir, thereby reducing the operation stroke of the brake operating member. Since a reservoir for controlling the brake fluid pressure by the control valve means is also used as a reservoir for securing an operation stroke, the number of parts can be reduced. Can do.

  According to the invention described in claim 5, since the surplus brake hydraulic pressure generated in the hydraulic pressure path can be accumulated by the accumulator by opening the stroke adjustment control valve at the time of regenerative cooperative brake control, a good operation feeling can be obtained. The stroke absorbing means can be simplified by using the pressure accumulation type.

  According to the sixth aspect of the present invention, the stroke absorbing means is constructed in the same manner as a brake system comprising a wheel brake mounted on a drive wheel and a control valve means corresponding to the wheel brake, whereby the stroke absorbing means Can be simplified.

  Furthermore, according to the seventh aspect of the invention, since a part of the brake fluid pressure output from the master cylinder can be accumulated by the accumulator during the regenerative cooperative brake control, it is possible to cope with a sudden brake operation of the brake operation member. It is possible to obtain a better operational feeling.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  First, a first embodiment of the present invention will be described with reference to FIG. 1. For example, a front wheel drive four-wheel vehicle is equipped with a tandem master cylinder M provided with a reservoir 2, and serves as a brake operation member. A brake operating force is input to the master cylinder M from the brake pedal 1. The master cylinder M includes, for example, a first output port 3 corresponding to a left front wheel brake BF and a right rear wheel brake BR, and a right front wheel brake (not shown) and a left rear wheel brake (for example). And a hydraulic pressure corresponding to the operating force of the brake pedal 1 is output from the first and second output ports 3 and 4.

  The brake fluid pressure control device on the first output port 3 side and the brake fluid pressure control device on the second output port 4 side have the same configuration, and hereinafter the brake fluid on the first output port 3 side. Only the portion related to the pressure device will be described, and the description of the portion related to the brake fluid pressure control device on the second output port 4 side will be omitted.

  The first output port 3 communicates with an output hydraulic pressure path 6 to which a pressure detector 4 is connected. The output hydraulic pressure path 6 allows only flow from the output hydraulic pressure path 6 side, that is, the master cylinder M side. Is connected to the hydraulic path 8 via the one-way valve 7. The hydraulic pressure path 8 is connected to a left front wheel brake BF and a right rear wheel brake BR via inlet valves 9F, 9R which are normally open linear solenoid valves. The inlet valves 9F, 9R are connected to the inlet valves 9F, 9R. The one-way valves 10F and 10R permitting the flow of the brake fluid from the wheel brakes BF and BR to the hydraulic pressure path 8 are connected in parallel, and the left front wheel brake BF and the right rear wheel brake BR are connected in parallel. Is connected to the reservoir 12 via outlet valves 11F and 11R which are normally closed linear solenoid valves. Further, between the parallel circuit composed of the inlet valves 9F, 9R and the one-way valves 10F, 10R and the left front wheel brake BF and the right rear wheel brake BR, the brake fluid pressure of each wheel brake BF, BR is set. Pressure detectors 13F and 13R for detection are connected.

  Thus, the inlet valve 9F, the one-way valve 10F, and the outlet valve 11F constitute control valve means VF corresponding to the left front wheel brake BF, and the inlet valve 9R, the one-way valve 10R, and the outlet valve 11R The control valve means VR corresponding to the wheel brake BR for wheels is configured, and both control valve means VF, VR use the hydraulic pressure in the hydraulic pressure path 8 for the left front wheel and right rear wheel brakes BF, BR. , A state in which the brake fluid pressure of the left front wheel and right rear wheel brakes BF and BR is maintained, and a state in which the brake fluid pressure of the left front wheel and right rear wheel brakes BF and BR is released to the reservoir 12. Can be switched.

  A suction side of a pump 15 driven by an electric motor 14 is connected to the reservoir 12 via a check valve 16, and a discharge side of the pump 15 is connected to a hydraulic pressure path 8 via a damper 17 and an orifice 18. That is, the pump 15 can discharge the brake fluid pumped up from the reservoir 12 to the hydraulic pressure path 8.

  The output hydraulic pressure path 6 is connected to the hydraulic pressure path 8 via a pressure regulating valve 19 which is a normally open type linear solenoid valve, and the pump is connected via a suction valve 20 which is a normally closed type linear solenoid valve. 15 are connected between the suction side, that is, between the pump 15 and the check valve 16.

  Thus, the pressure regulating valve 19 can be pressure-regulated so as to maintain the fluid pressure in the fluid pressure path 8 constant, and the master cylinder M can be operated by opening the suction valve 20 and operating the pump 15. The output hydraulic pressure is increased by the pump 15 and output to the hydraulic pressure path 8, and the hydraulic pressure in the hydraulic pressure path 8 can be maintained at a constant hydraulic pressure by the pressure regulating valve 19.

  In such a brake fluid pressure control apparatus, the control valve means VF and VR are operated in a state in which the pressure regulating valve 19 is regulated and the suction valve 20 is opened and the pump 15 is activated during non-brake operation. By controlling the traction control, it is possible to execute traction control that eliminates excessive slip of the drive wheels during acceleration and vehicle behavior control that stabilizes the behavior of the vehicle by applying different braking forces to the left and right wheels. In addition, anti-lock brake control to prevent the wheels from falling into a locked state during brake operation, and wheel brakes for the left front wheel mounted on the left front wheel, which is the drive wheel, to reduce the friction brake by the regenerative brake torque It is possible to execute regenerative cooperative brake control in which the brake fluid pressure of BF is controlled to be reduced.

  By the way, at the time of the regenerative cooperative brake control, the brake fluid pressure of the left front wheel brake BF is controlled to be reduced in order to reduce the friction brake. Will change.

  Therefore, a stroke absorbing means 21A is connected to the output hydraulic pressure path 6 connected to the master cylinder M to absorb the surplus brake fluid accompanying the reduction of the brake fluid pressure and ensure the operation stroke of the brake pedal 1. The stroke absorbing means 21A includes a stroke adjusting control valve 22 that is a normally closed linear solenoid valve that is open during non-regenerative cooperative brake control but is open during regenerative cooperative brake control. The output hydraulic pressure path 6 is connected to the reservoir 12 via a stroke adjustment control valve 22.

  Next, the operation of the first embodiment will be described. During regenerative cooperative brake control, the master cylinder M can be communicated with the reservoir 12 by opening the stroke adjustment control valve 22 and discharged from the master cylinder M. By temporarily storing a part of the brake fluid in the reservoir 12, the operation stroke of the brake pedal 1 can be secured even during the regeneration cooperative brake control, and a good operation feeling can be obtained.

  In addition, since the brake fluid pressure control reservoir 12 by the control valve means VF and VR is also used as a reservoir for ensuring the operation stroke of the brake pedal 1, the number of parts can be reduced.

  In the first embodiment, the brake fluid pressure control device is configured to execute traction control and vehicle behavior control. However, as a modification of the first embodiment, only antilock brake control and regenerative cooperative brake control are executed. It is also possible to use a brake fluid pressure control device that can be used. In this case, the one-way valve 7, the pressure regulating valve 19, and the suction valve 20 are unnecessary, and the output fluid pressure is set so that the brake fluid flows in any direction. What is necessary is just to set it as the structure by which the path 6 was always connected to the hydraulic path 8.

  FIG. 2 shows a second embodiment of the present invention. The parts corresponding to the first embodiment are indicated by the same reference numerals, and the detailed description is omitted.

  In order to secure the operation stroke of the brake pedal 1 during regenerative cooperative brake control, the hydraulic pressure path 8 absorbs the excess brake fluid accompanying the reduction of the brake fluid pressure and secures the operation stroke of the brake pedal 1. The stroke absorbing means 21B is provided with a stroke adjustment control valve 22 and a stroke adjustment dedicated reservoir 23 that enables pumping of brake fluid by the pump 15, and includes a hydraulic pressure. The path 8 is connected to a stroke adjustment dedicated reservoir 23 via a stroke adjustment control valve 22, and the stroke adjustment dedicated reservoir 23 is connected to the suction side of the pump 15, that is, between the pump 15 and the check valve 16 via a check valve 24. The

  According to the second embodiment, surplus brake fluid generated in the hydraulic pressure passage 8 can be temporarily stored in the stroke adjustment dedicated reservoir 23. Therefore, even during regenerative cooperative brake control, the operation stroke of the brake pedal 1 can be ensured, and a good operation feeling can be obtained.

  Also, the brake fluid stored in the stroke adjustment dedicated reservoir 23 closes the stroke adjustment control valve 22 and the intake valve 6 during non-regenerative cooperative brake control or when the stroke adjustment of the brake pedal 1 is unnecessary, By operating the pump 15 with the pressure regulating valve 19 opened, the pressure is returned to the master cylinder M side.

  By the way, when the brake pedal 1 is operated, when the pump 15 is deactivated, the output hydraulic pressure of the master cylinder M guided to the hydraulic pressure path 8 via the one-way valve 7 is applied to the wheel brakes BF and BR. Further, the suction valve 20 is opened to operate the pump 15 and the pressure adjusting valve 19 is operated to increase the output hydraulic pressure of the master cylinder M to a predetermined hydraulic pressure, and the wheel brakes BF from the hydraulic pressure path 8 are increased. , BR can be applied to the excess brake fluid generated in the hydraulic passage 8 in response to the pressure reduction control of the brake fluid pressure of the left front wheel brake BF in the regenerative cooperative brake control. Can be absorbed by the stroke absorbing means 21B.

  FIG. 3 shows a third embodiment of the present invention. Portions corresponding to the first and second embodiments are indicated by the same reference numerals, and detailed description thereof is omitted.

  In order to secure the operation stroke of the brake pedal 1 during regenerative cooperative brake control, the hydraulic pressure path 8 absorbs the excess brake fluid accompanying the reduction of the brake fluid pressure and secures the operation stroke of the brake pedal 1. The means 21C is connected, and the stroke absorbing means 21C includes a stroke adjustment control valve 22 and a reservoir 12, and the hydraulic pressure path 8 is connected to the reservoir 12 via the stroke adjustment control valve 22. .

  According to the third embodiment, surplus brake fluid generated in the hydraulic pressure path 8 during regenerative cooperative brake control can be temporarily stored in the reservoir 12, and the operation stroke of the brake pedal 1 can be achieved even during regenerative cooperative brake control. And the brake fluid pressure control reservoir 12 by the control valve means VF and VR is also used as a reservoir for ensuring the operation stroke of the brake pedal 1. The number of parts can be reduced.

  FIG. 4 shows a fourth embodiment of the present invention. The parts corresponding to those of the first to third embodiments are indicated by the same reference numerals, and detailed description thereof is omitted.

  The stroke absorbing means 21B for securing the operation stroke of the brake pedal 1 during regenerative cooperative brake control is connected to the hydraulic pressure path 8, and an accumulator 25 capable of accumulating a part of the discharge hydraulic pressure of the master cylinder M during regenerative cooperative brake control. Is connected between the suction valve 20 and the suction side of the pump 15. That is, the accumulator 25 is connected to the master cylinder M separately from the stroke absorbing means 21B.

  According to the fourth embodiment, the regenerative cooperative brake in a brake state in which the suction valve 20 is opened and the pump 15 is operated to increase the hydraulic pressure in the hydraulic pressure path 8 higher than the output hydraulic pressure of the master cylinder M. During control, a part of the hydraulic pressure output from the master cylinder M can be accumulated by the accumulator 25, which can cope with a sudden operation of the brake pedal 1 and obtain a better operational feeling. Can do.

  As a modification of the fourth embodiment, an accumulator 25 capable of accumulating a part of the discharge hydraulic pressure of the master cylinder M during regenerative cooperative brake control is added to the first and third embodiments shown in FIGS. You may make it do.

  FIG. 5 shows a fifth embodiment of the present invention. The parts corresponding to the first to fourth embodiments are indicated by the same reference numerals, and detailed description thereof is omitted.

  In order to secure the operation stroke of the brake pedal 1 during regenerative cooperative brake control, the hydraulic pressure path 8 absorbs the excess brake fluid accompanying the reduction of the brake fluid pressure and secures the operation stroke of the brake pedal 1. The stroke absorbing means 21D includes a stroke adjustment control valve 22 and an accumulator 26 that can pump up the brake fluid by the pump 15, and the hydraulic pressure path 8 is a stroke adjustment control. An accumulator 26 is connected via a valve 22, and the accumulator 26 is connected via a check valve 27 between the suction side of the pump 15, that is, between the pump 15 and the check valve 16.

  According to the fifth embodiment, the excess hydraulic pressure generated in the hydraulic pressure path 8 is temporarily accumulated in the accumulator 26 during regenerative cooperative brake control. Therefore, even during regenerative cooperative brake control, the operation stroke of the brake pedal 1 can be secured, a good operation feeling can be obtained, and the stroke absorbing means 21D can be simplified by adopting the pressure accumulation type. it can.

  FIG. 6 shows a sixth embodiment of the present invention, and parts corresponding to the first to fifth embodiments are denoted by the same reference numerals.

  In order to secure the operation stroke of the brake pedal 1 during regenerative cooperative brake control, the hydraulic pressure path 8 absorbs the excess brake fluid accompanying the reduction of the brake fluid pressure and secures the operation stroke of the brake pedal 1. The stroke absorbing means 21E is connected to an accumulator 27 that can absorb the hydraulic load corresponding to the left front wheel brake BF mounted on the left front wheel, which is a driving wheel, and the accumulator 27. And a normally-closed stroke adjustment control valve 22 interposed between the hydraulic pressure paths 8 and a valve-opening control upon completion of the regenerative cooperative brake control although the valve is closed during the regenerative cooperative brake control. A normally closed release valve 28 interposed between the accumulator 27 and the reservoir 12, and a stroke adjusting control valve 22 and Houben 27 for absorbing the excess liquid generated in the regenerative cooperative brake control in the accumulator 27, the accumulator 27 absorbs a liquid volume required, also be controlled to release.

  According to the sixth embodiment, the excess hydraulic pressure generated in the hydraulic pressure path 8 is temporarily accumulated in the accumulator 27 during regenerative cooperative brake control. Therefore, the operation stroke of the brake pedal 1 can be secured even during regenerative cooperative brake control, a good operation feeling can be obtained, and the stroke absorbing means 21E can be simplified by adopting the pressure accumulation type. it can.

  Further, the stroke absorbing means 21E is configured in the same manner as the brake system including the left front wheel brake BF and the control valve means VF corresponding to the left front wheel brake BF, thereby simplifying the control of the stroke absorbing means 21E. can do.

  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.

1 is a hydraulic circuit diagram showing a brake hydraulic pressure control device of a first embodiment. It is a hydraulic-pressure circuit diagram which shows the brake hydraulic-pressure control apparatus of 2nd Example. It is a hydraulic-pressure circuit diagram which shows the brake hydraulic-pressure control apparatus of 3rd Example. It is a hydraulic-pressure circuit diagram which shows the brake hydraulic-pressure control apparatus of 4th Example. It is a hydraulic-pressure circuit diagram which shows the brake hydraulic-pressure control apparatus of 5th Example. It is a hydraulic-pressure circuit diagram which shows the brake hydraulic-pressure control apparatus of 6th Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Brake pedal 8 as a brake operation member ... Hydraulic pressure path 12 ... Reservoir 15 ... Pump 19 ... Cut valve 20 ... Suction valve 21A, 21B, 21C, 21D, 21E ..Stroke absorbing means 22 ... Stroke adjustment control valve 23 ... Stroke adjustment dedicated reservoirs 25, 26, 27 ... Accumulator 28 ... Release valves BF, BR ... Wheel brake M ... Master Cylinders VF, VR ... Control valve means

Claims (7)

  A master cylinder (M) that outputs a hydraulic pressure according to the operation of the brake operating member (1), and a hydraulic pressure path that is connected to the master cylinder (M) so as to guide the output hydraulic pressure of the master cylinder (M) (8), a reservoir (12) capable of storing brake fluid, a pump (15) capable of discharging brake fluid pumped up from the reservoir (12) to the hydraulic pressure passage (8), and the hydraulic pressure passage ( 8) Applying the hydraulic pressure to the wheel brakes (BF, BR), maintaining the brake hydraulic pressure of the wheel brakes (BF, BR), and the brake hydraulic pressure of the wheel brakes (BF, BR) (12) is provided with control valve means (VF, VR) capable of switching the release state, and the brake fluid pressure of the wheel brake (BF) mounted on the drive wheel is controlled according to the regenerative braking force. Cooperation In the brake hydraulic pressure control device for a vehicle capable of rake control, the stroke adjustment control valve (22) and the reservoir (which are valve-opened during the regenerative cooperative brake control but are closed during the non-regenerative cooperative brake control and the reservoir ( A brake fluid pressure control device for a vehicle, characterized in that a stroke absorbing means (21A) connected to 12) is connected to the master cylinder (M).   The master cylinder (M) that outputs the hydraulic pressure according to the operation of the brake operating member (1) and the one-way valve (7) that allows the brake fluid to flow only from the master cylinder (M) side. A hydraulic path (8) connected to the master cylinder (M), a reservoir (12) capable of storing brake fluid, and brake fluid pumped up from either the reservoir (12) or the master cylinder (M) The pump (15) that can be discharged to the hydraulic pressure path (8), and the hydraulic pressure in the hydraulic pressure path (8) can be adjusted, and between the hydraulic pressure path (8) and the master cylinder (M) The pressure regulating valve (19) provided, the suction valve (20) provided between the suction side of the pump (15) and the master cylinder (M), and the hydraulic pressure in the hydraulic pressure passage (8) are controlled by a wheel brake (BF , BR), the state acting on Control valve means (VF, VR) capable of switching between a state in which the brake fluid pressure of the wheel brake (BF, BR) is maintained and a state in which the brake fluid pressure of the wheel brake (BF, BR) is released to the reservoir (12); In a vehicle brake hydraulic pressure control device that enables regenerative cooperative brake control that controls the brake hydraulic pressure of a wheel brake (BF) mounted on a drive wheel in accordance with the regenerative brake force. Stroke absorbing means (21B, 21C, 21D, 21E) for absorbing surplus brake fluid generated in response to pressure reduction control of the mounted wheel brake (BF) during the regenerative cooperative brake control includes the hydraulic pressure path. A brake fluid pressure control device for a vehicle connected to (8).   The stroke absorbing means (21B) is open during the regenerative cooperative brake control although the stroke adjustment reservoir (23) that enables pumping of the brake fluid by the pump (15) is closed during the non-regenerative cooperative brake control. 3. The brake hydraulic pressure control device for a vehicle according to claim 2, wherein the brake hydraulic pressure control device for the vehicle is connected to the hydraulic pressure passage (8) through a valve adjusting stroke control valve (22).   The stroke absorbing means (21C) is connected to the reservoir (12) via a stroke adjustment control valve (22) that is valve-opened during the regenerative cooperative brake control although the reservoir (12) is closed during the non-regenerative cooperative brake control. 3. The vehicle brake fluid pressure control device according to claim 2, wherein the vehicle brake fluid pressure control device is connected to the fluid pressure passage.   The stroke absorbing means (21D) is controlled to open at the time of the regenerative cooperative brake control, although the accumulator (26) that can pump up the brake fluid by the pump (15) is in the closed state at the time of non-regenerative cooperative brake control. 3. The vehicle brake hydraulic pressure control device according to claim 2, wherein the brake hydraulic pressure control device is connected to the hydraulic pressure passage (8) via a stroke adjusting control valve (22).   The stroke absorbing means (21E) includes an accumulator (27) capable of absorbing a hydraulic load corresponding to a wheel brake (BF) mounted on a driving wheel, and between the accumulator (27) and the hydraulic pressure path (3). A normally closed stroke adjusting control valve (22) interposed between the accumulator (27) and the reservoir (12), and a normally closed release valve (28) interposed between the accumulator (27) and the reservoir (12). The brake fluid pressure control device for a vehicle according to claim 2,   An accumulator (25) capable of accumulating a part of the discharge hydraulic pressure of the master cylinder (M) during the regenerative cooperative brake control is connected to the master cylinder (M) separately from the stroke absorbing means (21A to 21E). The brake hydraulic pressure control device for a vehicle according to any one of claims 1 to 6.

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