JP2006240542A - Hydraulic brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To output an output liquid pressure in response to an operation amount of a brake pedal even when abnormality occurs on a pressure control valve. <P>SOLUTION: An always closed first solenoid opening/closing valve 34 is provided on a first branch liquid pipe 33 for communicating a part from an output liquid pipe 31 connected to a part between a liquid pressure output side of the pressure control valve 3 and an auxiliary liquid pressure chamber 26 of a master cylinder 5 with a reservoir 8. An always closed second solenoid opening/closing valve 36 is provided on a second branch liquid pipe 35 for communicating a part with the auxiliary liquid pressure chamber 26 of the master cylinder 5 via an accumulator 11 side and a liquid pressure input side of the pressure control valve 3. When abnormality that the output liquid pressure outputted from the pressure control valve 3 is reduced to a predetermined range or less is generated at operation of the brake, the first solenoid opening/closing valve 34 is opened and when abnormality of pressure reduction failure is generated on the output liquid pressure outputted from the pressure control valve 3, the second solenoid opening/closing valve 36 is closed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hydraulic brake device.

As a hydraulic brake device provided in a vehicle such as an automobile, for example, a hydraulic brake device disclosed in Patent Document 1 is supplied from a hydraulic pressure source having an accumulator for accumulating hydraulic fluid and the hydraulic pressure source. A pressure regulating valve that regulates and outputs the hydraulic pressure according to the depressing force of the brake pedal, and a hydraulic pressure that corresponds to the hydraulic pressure in the auxiliary hydraulic pressure chamber operates by the hydraulic pressure supplied from the pressure regulating valve to the auxiliary hydraulic pressure chamber. A master cylinder that is generated and output in the hydraulic chamber of the master cylinder and a wheel cylinder that is actuated by the output hydraulic pressure of the master cylinder and applies braking force to the wheels of the vehicle are provided. A large brake force can be obtained by the pressure of the light brake pedal by the pressure.
Japanese Patent Laid-Open No. 2002-264795 (Claim 1, FIG. 1)

  By the way, in the hydraulic brake device of the above-mentioned patent document 1, when a predetermined hydraulic pressure is output from the accumulator to the pressure regulating valve, for example, a foreign matter or the like is clogged in the hydraulic pressure path on the hydraulic pressure output side of the pressure regulating valve. When this occurs, the hydraulic pressure output from the pressure regulating valve to the auxiliary hydraulic pressure chamber during brake operation falls below a predetermined range, so that the output hydraulic pressure corresponding to the operation amount of the brake pedal cannot be output.

  Further, the hydraulic brake device disclosed in Patent Document 1 is configured such that when the brake is operated, the brake pedal is pushed into the back side of the output hydraulic chamber against the urging force of the spring by depressing the brake pedal. The output hydraulic pressure adjusted according to the operation amount is output to the master cylinder side. However, at this time, if a problem occurs that the movement of the valve spool becomes worse due to the spring being caught on the peripheral surface of the output hydraulic pressure chamber, the return of the valve spool becomes worse even if the brake pedal is loosened, The output hydraulic pressure corresponding to the operation amount of the brake pedal cannot be output. For this reason, even if the depression of the brake pedal is loosened, the output hydraulic pressure output from the pressure regulating valve to the master cylinder cannot be reduced (reduced).

  Therefore, an object of the present invention is to provide a hydraulic brake device that can output an output hydraulic pressure corresponding to an operation amount of a brake petal even when an abnormality occurs in the pressure regulating valve.

  In order to achieve the object, the invention according to claim 1 is a hydraulic pressure generating means comprising a pump for pumping hydraulic fluid from a reservoir and an accumulator for accumulating the hydraulic fluid pumped by the pump within a predetermined pressure range. And a pressure regulating valve that regulates and outputs the hydraulic pressure supplied from the accumulator according to the operation amount of the brake operating member, and a hydraulic pressure operating means that operates by the output hydraulic pressure output from the pressure regulating valve. In the hydraulic brake device, a normally closed on-off valve interposed in a fluid passage communicating between the accumulator side and a fluid pressure input side of the pressure regulating valve and the fluid pressure operating means, and the pressure regulating valve from the accumulator And a hydraulic pressure value detecting means for detecting a hydraulic pressure value output from the hydraulic pressure output side of the pressure regulating valve to the hydraulic pressure operating means. And an operation amount detection means for detecting an operation amount of the brake operation member; and the on-off valve based on each detection information from the fluid pressure value detection means, the output fluid pressure value detection means, and the operation amount detection means. Control means for controlling opening and closing, and the control means outputs a hydraulic pressure within a predetermined range from the accumulator to the hydraulic pressure input side of the pressure regulating valve according to detection information inputted from the hydraulic pressure value detecting means. And the value of the output hydraulic pressure output from the hydraulic pressure output side of the pressure regulating valve when the brake is operated by the brake operating member is determined based on the detection information input from the output hydraulic pressure value detecting means. The on-off valve is closed when an abnormality occurs in the pressure regulating valve that is determined to be lower than a predetermined value with respect to the reference output hydraulic pressure value obtained based on the brake operation amount information input from the operation amount detecting means. Status Switching to Hiraku Luo, is characterized in that output to said hydraulic actuating means the hydraulic pressure output from the accumulator side through the liquid pressure input side of the pressure regulating valve.

  According to the first aspect of the present invention, the value of the output hydraulic pressure output from the hydraulic pressure output side of the pressure regulating valve when the brake is operated by the brake operating member is determined from the brake operation amount information input from the operation amount detection means. In the event of an abnormality in the pressure regulating valve that falls below a predetermined value with respect to the reference output hydraulic pressure at this time, the on-off valve is switched from the closed state to the opened state, and the hydraulic pressure output from the accumulator side is adjusted to the hydraulic pressure of the regulating valve. It can output to the hydraulic pressure operating means through the input side.

  According to a second aspect of the present invention, the control means opens and closes the on-off valve so that the hydraulic pressure of the reference output hydraulic pressure value is output to the hydraulic pressure operating means when an abnormality occurs in the pressure regulating valve. It is characterized by control.

  According to the second aspect of the present invention, the hydraulic pressure of the reference output hydraulic pressure value can be output to the hydraulic pressure operating means by the opening / closing control of the opening / closing valve when the abnormality of the pressure regulating valve occurs.

  According to a third aspect of the present invention, the control means outputs the hydraulic pressure higher than the reference output hydraulic pressure value to the hydraulic pressure operating means when an abnormality occurs in the pressure regulating valve. The on / off valve is controlled to open / close.

  According to the third aspect of the present invention, when an abnormality occurs in the pressure regulating valve, a hydraulic pressure higher than the reference output hydraulic pressure value can be output to the hydraulic pressure operating means by opening / closing control of the on / off valve.

  According to a fourth aspect of the present invention, there is provided a hydraulic pressure generating means having a pump for pumping hydraulic fluid from a reservoir and an accumulator for accumulating the hydraulic fluid pumped by the pump in a predetermined pressure range, and is supplied from the accumulator. In the hydraulic brake device, comprising: a pressure adjusting valve that adjusts and outputs the hydraulic pressure according to an operation amount of the brake operating member; and a hydraulic pressure operating means that operates according to an output hydraulic pressure output from the pressure regulating valve. A normally closed on-off valve interposed in a fluid passage communicating between the reservoir from a fluid passage connected between the fluid pressure output side of the pressure regulating valve and the fluid pressure actuating means; and fluid of the pressure regulating valve An output hydraulic pressure value detecting means for detecting an output hydraulic pressure value output from the pressure output side to the hydraulic pressure operating means, an operating amount detecting means for detecting an operating amount of the brake operating member, and the output hydraulic pressure value Detection means and said operation Control means for controlling opening and closing of the on-off valve based on each detection information from the amount detection means, and the control means is configured to control the brake operation based on detection information input from the output hydraulic pressure value detection means. The value of the output hydraulic pressure output from the hydraulic pressure output side of the pressure regulating valve when the brake is operated by the member is obtained based on the detection information input from the operation amount detecting means, and the reference output hydraulic pressure value at this time is obtained. When the abnormality of the pressure regulating valve determined to be higher than a predetermined value, the on-off valve is switched from the closed state to the open state, and a part of the output hydraulic pressure output from the hydraulic pressure input side of the pressure regulating valve is It outputs to the reservoir through a liquid passage provided with the on-off valve.

  According to the fourth aspect of the present invention, the value of the output hydraulic pressure output from the hydraulic pressure output side of the pressure regulating valve during the brake operation by the brake operation member is based on the brake operation amount information input from the operation amount detection means. When the abnormality of the pressure regulating valve determined to be higher than a predetermined value with respect to the reference output hydraulic pressure value obtained at this time, the on-off valve is switched from the closed state to the open state, and the hydraulic pressure input side of the pressure regulating valve is Part of the output hydraulic pressure that is output can be output to the reservoir through a liquid passage provided with an on-off valve.

  According to a fifth aspect of the present invention, the control means controls the opening and closing of the on-off valve so that the hydraulic pressure of the reference output hydraulic pressure value is output to the hydraulic pressure operating means when an abnormality occurs in the pressure regulating valve. It is characterized by that.

  According to the fifth aspect of the present invention, when an abnormality occurs in the pressure regulating valve, the hydraulic pressure of the reference output hydraulic pressure value can be output to the hydraulic pressure operating means by the on / off control of the on / off valve.

  According to a sixth aspect of the present invention, the on-off valve is configured so that the control means outputs a hydraulic pressure lower than the reference output hydraulic pressure value to the hydraulic pressure operating means when an abnormality occurs in the pressure regulating valve. It is characterized by controlling opening and closing.

  According to the sixth aspect of the present invention, when an abnormality occurs in the pressure regulating valve, a hydraulic pressure lower than the reference output hydraulic pressure value can be output to the hydraulic pressure operating means by the opening / closing control of the on / off valve.

  According to the present invention, when an abnormality occurs in which the output hydraulic pressure output from the pressure regulating valve drops below a predetermined range during braking operation, or an abnormal pressure reduction occurs in the output hydraulic pressure output from the pressure regulating valve 3. Even in this case, the output hydraulic pressure corresponding to the operation amount of the brake pedal can be output.

  Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 is a schematic configuration diagram showing a hydraulic brake device according to an embodiment of the present invention. In this embodiment, the hydraulic brake device is applied to a vehicle hydraulic brake device.

  As shown in FIG. 1, a hydraulic brake device 1 according to this embodiment includes a hydraulic pressure generation source 2 that generates a hydraulic pressure P1, and a pressure regulating valve 3 that regulates the hydraulic pressure output from the hydraulic pressure generation source 2. A master cylinder 5 for outputting a hydraulic pressure (master cylinder pressure) for applying a braking force to the wheel cylinders 4a, 4b, 4c, 4d of each brake by a hydraulic pressure (output hydraulic pressure) output from the pressure regulating valve 3; The brake petal 6 is provided.

  The hydraulic pressure generation source 2 includes a motor 7, a pump 10 driven by the motor 7 to pump hydraulic fluid (brake fluid) L from the reservoir 8 through the liquid pipe 9, and hydraulic fluid pumped by the pump 10 within a predetermined pressure range. And an accumulator 11 for accumulating pressure and a first pressure sensor 12 for detecting the pressure of the hydraulic pressure P1 output from the accumulator 11. The hydraulic fluid L stored in the reservoir 8 is at atmospheric pressure.

  The pressure regulating valve 3 has a valve body 14 slidably fitted on one side (right side in the figure) in a cylindrical housing 13 and an end on one side (right side in the figure) opens in the valve body 14. The pressure regulating valve spool 16 slidably fitted to the peripheral surface (inner peripheral surface of the valve body 14) of the cylindrical output hydraulic pressure chamber 15 formed as described above, and the pressure regulating valve spool 16 in the right direction of FIG. An urging spring 17 is provided. An annular seal member (not shown) is provided on the peripheral surface of the pressure regulating valve spool 16 that is in sliding contact with the peripheral surface of the output hydraulic pressure chamber 15 of the valve body 14 (inner peripheral surface of the valve body 14).

  A small-diameter intermediate portion 14 c and an intermediate-diameter intermediate portion 14 d are formed between the large-diameter end portions 14 a and 14 b slidably in contact with the inside of the housing 13 on both ends of the outer peripheral surface of the valve body 14. Are in sliding contact with the small-diameter inner peripheral surface 13a. Note that the peripheral surfaces of the large-diameter end portions 14a and 14b of the valve body 14 slidably contacting the inner periphery of the housing 13 and the peripheral surface of the small-diameter intermediate portion 14c of the valve body 14 slidably contacting the small-diameter inner peripheral surface 13a of the housing 13 are provided. An annular seal member (not shown) is provided.

  An annular high-pressure chamber 18 formed by the large-diameter end portion 14a and the small-diameter intermediate portion 14c of the valve body 14 and the inner periphery and the small-diameter inner peripheral surface 13a of the housing 13 includes a liquid passage 13b formed in the housing 13, It is connected to the accumulator 11 through a liquid pipe 19 connected to the liquid passage 13b. Further, the low pressure chamber 20 formed by the outer end surface of the large-diameter end portion 14a of the valve body 14 and the end surface on one side (right side in the figure) in the housing 13 includes a liquid passage 13c formed in the housing 13 and this liquid. It is connected to the reservoir 8 via the liquid pipe 9 connected to the passage 13c.

  A shaft portion 16 a is integrally formed on the pressure regulating valve spool 16 on the side opposite to the output hydraulic pressure chamber 15 (right side in the figure) so as to protrude from the end surface opening 13 d of the housing 13. An annular seal member (not shown) is provided on the peripheral surface of the shaft portion 16 a that is in sliding contact with the peripheral surface of the end surface opening 13 d of the housing 13. A brake pedal 6 that is rotatably held is connected to the distal end side of the shaft portion 16a of the pressure regulating valve spool 16 so that the driver does not depress the brake pedal 6 during a non-brake operation (state shown in FIG. 1). Then, the large-diameter intermediate portion 16 b of the pressure regulating valve spool 16 is in contact with the end surface in the housing 13 by the biasing force of the spring 16. The brake pedal 6 is provided with a known brake operation amount detection sensor 38 that detects an operation amount of the brake pedal 6 (a depression amount of the brake pedal 6).

  The pressure regulating valve spool 16 includes a liquid passage 16c formed along the longitudinal direction (left side in FIG. 1) from the center of the end surface located in the output hydraulic pressure chamber 15, a small diameter intermediate portion 16d formed on the outer peripheral surface, and the small diameter. A communication path 16e that communicates the intermediate portion 16d and the liquid path 16c is provided. The valve body 14 is formed with a communication passage 14 e communicating between the inner peripheral surface thereof and the high pressure chamber 18 and a communication passage 14 f communicating between the inner peripheral surface thereof and the low pressure chamber 20. During non-braking operation (the state shown in FIG. 1), the communication passage 14e of the valve body 14 is blocked by the outer peripheral surface of the pressure regulating valve spool 16, and the communication passage 14f communicates with the small diameter intermediate portion 16d of the pressure regulating valve spool 16. At the time of brake operation (state of FIG. 2), the communication passage 14e of the valve body 14 is communicated with the small diameter intermediate portion 16d of the pressure regulating valve spool 16, and the communication passage 14f is blocked by the outer peripheral surface of the pressure regulating valve spool 16. It is configured as follows.

  In addition, a communication passage 14g communicating with the output chamber 21 and the output hydraulic pressure chamber 15 formed on the outer side (housing 13 side) is formed in the middle-diameter intermediate portion 14d of the valve body 14.

  The master cylinder 5 is provided so as to be adjacent to the valve body 14 on the other side (the left side in the figure) in the housing 13, and is slidably fitted to the inner periphery of the housing 13. Pistons 22a, 22b and springs 23a, 23b for urging the first and second pistons 22a, 22b in the right direction of FIG. 1 are provided. An annular seal member (not shown) is provided on each peripheral surface of the first and second pistons 22a and 22b that are in sliding contact with the inner periphery of the housing 13.

  A first master cylinder hydraulic pressure chamber 24 is formed between the first piston 22a and the second piston 22b. Between the second piston 22b and the end surface (left side in the figure) in the housing 13, A second master cylinder hydraulic chamber 25 is formed. Further, an auxiliary hydraulic chamber 26 is formed between the first piston 22a and the outer end surface of the valve body 14.

  The first and second master cylinder hydraulic chambers 24 and 25 are provided in each wheel via liquid passages 13e and 13f formed in the housing 13 and liquid pipes 27 and 28 connected to the liquid passages 13e and 13f, respectively. The wheel cylinders 4a, 4b, 4c and 4d are connected. The first and second master cylinder hydraulic chambers 24 and 25 are connected to the reservoir 8 via liquid passages 13g and 13h formed in the housing 13 and liquid pipes 29 and 30 connected to the liquid passages 13g and 13h, respectively. It is connected to the.

  The output chamber 21 of the pressure regulating valve 3 and the auxiliary hydraulic pressure chamber 26 communicate with each other through an output liquid pipe 31 that connects the liquid passages 13 i and 13 j formed in the housing 13. The output liquid pipe 31 is provided with a second pressure sensor 32. The high pressure chamber 18 of the pressure regulating valve 3 communicates with the output liquid pipe 31 through the first branch liquid pipe 33 connected to the liquid passage 13 k formed in the housing 13. The first branch liquid pipe 33 is provided with a normally closed first electromagnetic on-off valve 34. The low pressure chamber 20 of the pressure regulating valve 3 communicates with the output liquid pipe 31 through a second branch liquid pipe 35 connected to a liquid passage 13 l formed in the housing 13. The second branch liquid pipe 35 is provided with a normally closed second electromagnetic opening / closing valve 36.

  Based on the pressure information input from the first and second pressure sensors 12 and 32 and the brake operation amount information input from the brake operation amount detection sensor 38, the control device (ECU) 37 The opening / closing control of the second electromagnetic opening / closing valves 34, 36 can be performed (details will be described later).

  Next, the operation of the hydraulic brake device 1 will be described.

<Non-brake operation>
When the brake pedal 6 is not depressed (when the brake is not operated), the hydraulic fluid (brake fluid) L is pumped up from the reservoir 8 through the fluid pipe 9 by the pump 10 by driving the motor 7 (ON). The accumulator 11 pressurizes the hydraulic fluid and accumulates a predetermined hydraulic pressure. The hydraulic pressure P1 output from the accumulator 11 is supplied to the high pressure chamber 18 of the pressure regulating valve 3 through the liquid pipe 19 and the liquid passage 13b. At this time, the control device 37 controls the drive of the motor 7 based on the detection signal input from the first pressure sensor 12, and outputs the hydraulic pressure P1 set in a predetermined pressure range.

  In this situation, the communication passage 14e is blocked by the spring 17 at the outer peripheral surface of the pressure regulating valve spool 16 urged in the right direction in the figure, so that the hydraulic pressure P1 is transferred from the high pressure chamber 18 to the output hydraulic pressure chamber 15. Not output. Accordingly, no hydraulic pressure is generated in the output hydraulic pressure chamber 15 when the brake pedal 6 shown in FIG.

<During normal brake operation>
During normal brake operation, as shown in FIG. 2, when the driver steps on the brake petal 6, the tip side (left side in FIG. 2) of the pressure regulating valve spool 16 is biased by the spring 17 according to the amount of depression. Against the rear side of the output hydraulic pressure chamber 15 (left side in FIG. 2). In this situation, the hydraulic pressure P1 is output from the high pressure chamber 18 to the output hydraulic pressure chamber 15 in a communicating state through the communication passage 14e, the small diameter intermediate portion 16d, the communication passage 16e, and the communication passage 16c. As a result, in the output hydraulic pressure chamber 15, the input hydraulic pressure P1 is adjusted to a hydraulic pressure (output hydraulic pressure) P2 (P2 <P1) corresponding to the depression amount of the brake pedal 6.

  The regulated fluid pressure P2 is output to the auxiliary fluid pressure chamber 26 through the communication passage 14g, the output chamber 21, the fluid passage 13i, the output fluid pipe 31, and the fluid passage 13j. The first master 22a slides to the back side (left side in FIG. 2) of the housing 13 against the urging force of the spring 23a by the hydraulic pressure P2 input into the auxiliary hydraulic pressure chamber 26, so that the first master A hydraulic pressure P 3 is generated in the cylinder hydraulic pressure chamber 24. Furthermore, due to the hydraulic pressure (master cylinder pressure) P3 generated in the first master cylinder hydraulic pressure chamber 24 and the set load of the spring 23a, the second piston 22b is against the urging force of the spring 23b (the rear side of the housing 13 ( By sliding in the left side of FIG. 2, a hydraulic pressure (master cylinder pressure) P <b> 4 is generated in the second master cylinder hydraulic pressure chamber 25.

  As a result, the hydraulic pressures P3 and P4 generated in the first and second master cylinder hydraulic pressure chambers 24 and 25 are transferred to the wheel cylinders 4a, 4b, 4c and 4d through the respective liquid passages 13e and 13f and the respective liquid pipes 27 and 28. To output a predetermined braking force.

  As described above, during normal brake operation, the hydraulic pressure P2 adjusted according to the depression amount of the brake pedal 6 is output from the output hydraulic pressure chamber 15 of the pressure regulating valve 3 to the auxiliary hydraulic pressure chamber 26 of the master cylinder 5. Thus, a predetermined braking force can be obtained with a light depression force.

  When the depression of the brake petal 6 is released from the brake operation state, the pressure regulating valve spool 16 slides to the brake pedal 6 side (right side in FIG. 2) of the output hydraulic pressure chamber 15 by the urging force of the spring 17. 1 to the position at the time of non-brake operation shown in FIG. 1, and the output of the hydraulic pressure P1 from the high pressure chamber 18 to the output hydraulic pressure chamber 15 is shut off. In this situation, the output hydraulic pressure chamber 15 communicates with the reservoir 7 through the communication passages 16 c and 16 d, the small diameter intermediate portion 16 d, the communication passage 14 f, the low pressure chamber 20, the liquid passage 13 c and the liquid pipe 9. The hydraulic fluid in the auxiliary hydraulic chamber 26 is at atmospheric pressure.

  Further, the first and second pistons 22a and 22b also slide to the valve body 14 side (right side in FIG. 2) of the housing 13 by the urging force of the springs 23a and 23b, and return to the positions at the time of non-brake operation shown in FIG. . In this situation, the first and second master cylinder hydraulic chambers 24 and 25 communicate with the reservoir 8 through the liquid passages 13g and 13h and the liquid pipe 29.30, respectively, and the first and second master cylinder hydraulic chambers 24 and 25, respectively. The hydraulic fluid in 25 is at atmospheric pressure.

<When an abnormality occurs in the pressure regulating valve 3 (when the hydraulic pressure P2 output from the output hydraulic pressure chamber 15 decreases)>
In spite of a predetermined hydraulic pressure P1 being output from the accumulator 11 to the high pressure chamber 18 of the pressure regulating valve 3, during the braking operation shown in FIG. When the predetermined hydraulic pressure P2 output from the hydraulic pressure chamber 15 to the auxiliary hydraulic pressure chamber 26 is significantly reduced, the predetermined hydraulic pressure P2 corresponding to the operation amount of the brake pedal 6 cannot be output.

  Therefore, in the present embodiment, when the hydraulic pressure P2 output from the pressure regulating valve 3 during the brake operation shown in FIG. 2 decreases to a predetermined range or less, the control device 37 receives the pressure input from the first pressure sensor 12. Based on the information, it is determined that the predetermined hydraulic pressure P1 is output from the accumulator 11 to the high pressure chamber 18 of the pressure regulating valve 3, and is output from the output hydraulic pressure chamber 15 based on the pressure information input from the second pressure sensor 32. This time is determined from the brake operation amount information input from the brake operation amount detection sensor 21 and the hydraulic pressure P2 is determined to be a low pressure (hereinafter referred to as a detection value) that is equal to or lower than a predetermined range set in advance. When it is determined that the detected value is lower than a predetermined value with respect to the reference output hydraulic pressure value, it is determined that an abnormality has occurred in the pressure regulating valve 3.

  When the control device 37 determines that an abnormality has occurred in the pressure regulating valve 3, it outputs an open signal to the first electromagnetic on-off valve 34. The second electromagnetic opening / closing valve 36 is kept closed. When the first electromagnetic on-off valve 34 is changed from the closed state to the open state by the open signal from the control device 37, the high-pressure chamber 18 outputs through the first branch liquid pipe 33 provided with the liquid passage 13k and the first electromagnetic on-off valve 34. The liquid pipe 31 is in communication. As a result, the predetermined hydraulic pressure P1 output from the accumulator 11 to the high pressure chamber 18 passes through the liquid passage 13k, the first branch liquid pipe 33 provided with the first electromagnetic switching valve 34, the output liquid pipe 31, and the liquid passage 13j. It is output to the auxiliary hydraulic chamber 26. At this time, the hydraulic pressure that has also dropped from the output hydraulic pressure chamber 15 to a predetermined range or less is output to the auxiliary hydraulic pressure chamber 26 through the liquid passage 13i, the output liquid pipe 31, and the liquid passage 13j.

  Then, the control device 37 determines the hydraulic pressure of the reference output hydraulic pressure value at this time determined from the brake operation amount information input from the brake operation amount detection sensor 38 based on the pressure information input from the second pressure sensor 32. The opening and closing of the first electromagnetic opening / closing valve 34 is controlled so as to be output to the auxiliary hydraulic pressure chamber 26.

  As described above, when the hydraulic pressure P2 output from the pressure regulating valve 3 during the brake operation falls below a predetermined range, the reference output fluid at this time determined from the brake operation amount information input from the brake operation amount detection sensor 38. By controlling the opening and closing of the first electromagnetic on-off valve 34 so that the hydraulic pressure value is output to the auxiliary hydraulic pressure chamber 26, the hydraulic pressure corresponding to the operation amount of the brake pedal 6 is assisted from the high pressure chamber 18 side. The pressure can be output to the hydraulic chamber 26. Accordingly, even when an abnormality occurs when the hydraulic pressure P2 output from the pressure regulating valve 3 during braking is reduced to a predetermined range or less, the braking force can be reliably generated in each wheel cylinder 4a, 4b, 4c, 4d.

  Further, when the hydraulic pressure P2 output from the pressure regulating valve 3 during the brake operation described above falls below a predetermined range, the control device 37 performs the brake operation based on the pressure information input from the second pressure sensor 32. The first electromagnetic on-off valve 34 is opened and closed so that a hydraulic pressure higher than the reference output hydraulic pressure value at this time determined from the brake operation amount information input from the amount detection sensor 38 is output to the auxiliary hydraulic pressure chamber 26. May be controlled. In this case, the braking force is more reliably generated in the wheel cylinders 4a, 4b, 4c, and 4d even when an abnormality occurs when the hydraulic pressure P2 output from the pressure regulating valve 3 during braking is reduced to a predetermined range or less. be able to.

<When an abnormality occurs in the pressure regulating valve 3 (when the hydraulic pressure P2 output from the output hydraulic pressure chamber 15 is poorly reduced)>
In spite of a predetermined hydraulic pressure P1 being output from the accumulator 11 to the high pressure chamber 18 of the pressure regulating valve 3, for example, the spring 17 is caught on the peripheral surface of the output hydraulic pressure chamber 15 during the braking operation shown in FIG. For example, if the malfunction of the pressure regulating valve spool 16 becomes worse, the pressure of the pressure regulating valve spool 16 becomes worse even if the depression of the brake pedal 6 is loosened, so that the hydraulic pressure corresponding to the operation amount of the brake pedal 6 is increased. Cannot output. That is, even if the depression of the brake pedal 6 is loosened, the hydraulic pressure output from the output hydraulic pressure chamber 15 of the pressure regulating valve 3 to the auxiliary hydraulic pressure chamber 26 side cannot be reduced (depressurized), and the amount of operation of the brake pedal 6 is adjusted. The predetermined hydraulic pressure P2 cannot be output.

  Therefore, in the present embodiment, during the brake operation shown in FIG. 2, the control device 37 determines that the value of the hydraulic pressure output from the output hydraulic pressure chamber 15 is based on the pressure information input from the second pressure sensor 31. The hydraulic pressure P2 output from the output hydraulic pressure chamber 15 when it is determined that the reference output hydraulic pressure value at this time determined from the brake operation amount information input from the operation amount detection sensor 38 is higher than a predetermined value. It is determined that an abnormality of defective decompression has occurred.

  When the control device 37 determines that an abnormal pressure reduction has occurred in the pressure regulating valve 3, it outputs an open signal to the second electromagnetic opening / closing valve 36. The first electromagnetic on-off valve 34 is kept closed. When the second electromagnetic on-off valve 36 is changed from the closed state to the open state by the open signal from the control device 37, the output hydraulic pressure chamber 15 is connected to the communication passage 14g, the output chamber 21, the liquid passage 13i, the output liquid pipe 31, The reservoir 7 is brought into communication with the second branch liquid pipe 35 provided with the electromagnetic opening / closing valve 36, the liquid passage 13 l, the low pressure chamber 20, the liquid passage 13 c and the liquid pipe 9.

  As a result, a part of the hydraulic pressure output from the output hydraulic pressure chamber 15 to the output hydraulic pipe 31 is the second branch liquid pipe 35 provided with the second electromagnetic on-off valve 36, the liquid passage 13l, the low pressure chamber 20, the liquid passage. 13c and the liquid pipe 9 are opened to the reservoir 7, and the hydraulic pressure in the output hydraulic pressure chamber 15 can be reduced (depressurized).

  Then, the control device 37 determines the hydraulic pressure of the reference output hydraulic pressure value at this time determined from the brake operation amount information input from the brake operation amount detection sensor 38 based on the pressure information input from the second pressure sensor 32. The opening / closing of the second electromagnetic opening / closing valve 36 is controlled so as to be output to the auxiliary hydraulic pressure chamber 26. As a result, a part of the hydraulic pressure output from the output hydraulic pressure chamber 15 to the output hydraulic pipe 31 is opened to the reservoir 7 through the second branch liquid pipe 35 provided with the second electromagnetic opening / closing valve 36, and the pressure regulating valve 3. The decompression failure at is eliminated.

  As described above, when an abnormality in the pressure reducing valve 3 occurs during the brake operation, the hydraulic pressure of the reference output hydraulic pressure value at this time determined from the brake operation amount information input from the brake operation amount detection sensor 38 is supplemented. By controlling the opening and closing of the second electromagnetic on-off valve 36 so as to be output to the hydraulic pressure chamber 26, the pressure reduction failure at the pressure regulating valve 3 is eliminated and the hydraulic pressure corresponding to the operation amount of the brake pedal 6 is assisted. The pressure can be output to the hydraulic chamber 26. Therefore, even when a pressure reduction failure occurs in the pressure regulating valve 3 during a brake operation, a predetermined braking force can be reliably generated in each wheel cylinder 4a, 4b, 4c, 4d.

  Further, when an abnormality in the pressure reducing valve 3 occurs during the braking operation, the control device 37 is input from the brake operation amount detection sensor 38 based on the pressure information input from the second pressure sensor 32. The opening and closing of the second electromagnetic on-off valve 36 may be controlled so that a hydraulic pressure lower than the reference output hydraulic pressure at this time determined from the brake operation amount information is output to the auxiliary hydraulic pressure chamber 26. Good. In this case, the influence of the pressure reduction failure of the pressure regulating valve 3 can be further reduced, and the hydraulic pressure corresponding to the operation amount of the brake pedal 6 can be output to the auxiliary hydraulic pressure chamber 26.

The schematic block diagram which shows the time of non-brake operation of the hydraulic brake device which concerns on embodiment of this invention. The schematic block diagram which shows the time of normal brake operation of the hydraulic brake device which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic brake device 2 Hydraulic pressure generation source 3 Pressure regulating valve 4a, 4b, 4c, 4d Wheel cylinder 5 Master cylinder 6 Brake pedal (brake operation member)
7 Motor 8 Reservoir 10 Pump 11 Accumulator 12 First pressure sensor (hydraulic pressure detection means)
13 Housing 14 Valve body 15 Output hydraulic pressure chamber 16 Pressure regulating valve spool 22a First piston (hydraulic pressure operating means)
22b Second piston (hydraulic pressure actuating means)
32 Second pressure sensor (output hydraulic pressure detection means)
34 First solenoid valve (open / close valve)
36 2nd electromagnetic on-off valve (on-off valve)
37 Control device (control means)
38 Brake operation amount detection sensor (operation amount detection means)

Claims (6)

A hydraulic pressure generating means having a pump for pumping hydraulic fluid from the reservoir and an accumulator for accumulating the hydraulic fluid pumped by the pump in a predetermined pressure range, and operating the brake operating member with the hydraulic pressure supplied from the accumulator In a hydraulic brake device including a pressure regulating valve that regulates and outputs pressure according to an amount, and a hydraulic pressure operating unit that operates according to an output hydraulic pressure output from the pressure regulating valve,
A normally closed on-off valve interposed in a fluid passage communicating between the accumulator side and the fluid pressure operating means through the fluid pressure input side of the pressure regulating valve;
A fluid pressure value detecting means for detecting a fluid pressure value supplied from the accumulator to the pressure regulating valve;
Output hydraulic pressure value detecting means for detecting the value of the output hydraulic pressure output from the hydraulic pressure output side of the pressure regulating valve to the hydraulic pressure operating means;
An operation amount detection means for detecting an operation amount of the brake operation member;
Control means for controlling opening and closing of the on-off valve based on each detection information from the hydraulic pressure value detection means, the output hydraulic pressure value detection means, and the operation amount detection means,
The control unit determines that a predetermined range of hydraulic pressure is output from the accumulator to the hydraulic pressure input side of the pressure regulating valve based on detection information input from the hydraulic pressure value detection unit, and the output liquid The brake operation in which the value of the output hydraulic pressure output from the hydraulic pressure output side of the pressure regulating valve during the brake operation by the brake operation member is input from the operation amount detection means based on the detection information input from the pressure value detection means When the abnormality of the pressure regulating valve determined to be lower than a predetermined value with respect to the reference output hydraulic pressure value obtained at this time based on the quantity information, the on-off valve is switched from the closed state to the open state, and the accumulator side The hydraulic pressure output from the hydraulic pressure input means through the hydraulic pressure input side of the pressure regulating valve,
A hydraulic brake device characterized by that. The control means controls the opening and closing of the on-off valve so that a hydraulic pressure of the reference output hydraulic pressure value is output to the hydraulic pressure operating means when an abnormality occurs in the pressure regulating valve.
The hydraulic brake device according to claim 1. The control means opens and closes the on-off valve so that a hydraulic pressure higher than the reference output hydraulic pressure value is output to the hydraulic pressure operating means when an abnormality occurs in the pressure regulating valve.
The hydraulic brake device according to claim 1. A hydraulic pressure generating means having a pump for pumping hydraulic fluid from the reservoir and an accumulator for accumulating the hydraulic fluid pumped by the pump in a predetermined pressure range, and operating the brake operating member with the hydraulic pressure supplied from the accumulator In a hydraulic brake device including a pressure regulating valve that regulates and outputs pressure according to an amount, and a hydraulic pressure operating unit that operates according to an output hydraulic pressure output from the pressure regulating valve,
A normally closed on-off valve interposed in a fluid passage communicating between the reservoir from a fluid passage connected between the fluid pressure output side of the pressure regulating valve and the fluid pressure operating means;
Output hydraulic pressure value detecting means for detecting the value of the output hydraulic pressure output from the hydraulic pressure output side of the pressure regulating valve to the hydraulic pressure operating means;
An operation amount detection means for detecting an operation amount of the brake operation member;
Control means for controlling opening and closing of the on-off valve based on each detection information from the output hydraulic pressure value detection means and the operation amount detection means,
The control means uses the pressure information input from the output hydraulic pressure value detecting means to determine whether the output hydraulic pressure value output from the hydraulic pressure output side of the pressure regulating valve during the brake operation by the brake operating member is the operation amount. When the abnormality of the pressure regulating valve determined to be higher than a predetermined value with respect to the reference output hydraulic pressure value obtained at this time based on the brake operation amount information input from the detecting means, the on-off valve is opened from the closed state. Switching to a state, outputting a part of the output hydraulic pressure output from the hydraulic pressure input side of the pressure regulating valve to the reservoir through a liquid passage provided with the on-off valve,
A hydraulic brake device characterized by that. The control means controls the opening and closing of the on-off valve so that a hydraulic pressure of the reference output hydraulic pressure value is output to the hydraulic pressure operating means when an abnormality occurs in the pressure regulating valve.
The hydraulic brake device according to claim 4. The control means controls the opening and closing of the on-off valve so that a hydraulic pressure lower than the reference output hydraulic pressure value is output to the hydraulic pressure operating means when an abnormality occurs in the pressure regulating valve.
The hydraulic brake device according to claim 4.

Images