JP2005170229A - Hydraulic brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect air presence/absence in a brake system while reducing energy consumption in a hydraulic brake device. <P>SOLUTION: Communicating brake cylinders 20,21 of front left/right wheels with a master cylinder 12 stores working fluid of the master cylinder 12 in the brake cylinders 20,21. Then, master blocking valves 29,30 are made to be a closing status, boosting linear valves 150-152 are made to be opening statuses, and a pressure reduction linear valve 162 is made to be a closing status. The brake cylinders 20,21,22 are communicated with each other to have the same hydraulic pressures. When the hydraulic pressure is higher than a first hydraulic pressure for air presence/absence detection, the air is determined to be absent in a second braking system 232. When the hydraulic pressure is as low as or lower than the first hydraulic pressure for air presence/absence detection, the air is determined to be present. Not using a power type hydraulic pressure source 14 but using the working fluid of the master cylinder 12 can reduce the energy consumption at the time of detecting air presence/absence. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hydraulic brake device, and more particularly to detection of air in the hydraulic brake device.

In Patent Document 1, after hydraulic fluid is supplied from a power hydraulic pressure source to at least one brake cylinder, the operation of the power hydraulic pressure source is stopped, and the brake cylinder supplied with the hydraulic fluid is replaced with another brake cylinder. There is described a hydraulic brake device including an air detection device that detects the air based on the hydraulic pressure of the brake cylinders that are communicated with each other and communicated with each other in the communication state.
JP 11-286271 A

  The present invention is an improvement of a hydraulic brake device including a power-type hydraulic pressure source. For example, an abnormality can be detected while reducing power consumption.

Means and effects to solve the problem

The hydraulic brake device according to claim 1 is (a) a master cylinder that generates hydraulic pressure in accordance with the operation of a brake operation member by a driver, and (b) is supplied with power and is supplied with hydraulic fluid. A possible power-type hydraulic pressure source; and (c) a first brake cylinder group including at least one brake cylinder communicated with the master cylinder or communicated with the power-type hydraulic pressure source; A second brake cylinder group including at least one brake cylinder different from a brake cylinder included in the first brake cylinder group; and (e) at least one of the at least one brake cylinder of the first brake cylinder group. Is disconnected from the power hydraulic pressure source and communicated with the master cylinder, and the at least one brake of the first brake cylinder group. At least one cylinder is disconnected from the master cylinder and communicated with the power hydraulic pressure source, and at least one brake cylinder of the second brake cylinder group is communicated with the power hydraulic pressure source. A hydraulic brake device including a control device switchable to a second state,
A communication device for communicating at least one of the at least one brake cylinder of the first brake cylinder group with at least one of the at least one brake cylinder of the second brake cylinder group;
The control device includes: a first brake cylinder that is a brake cylinder supplied with hydraulic fluid from the master cylinder in the first state of the first brake cylinder group in a non-operating state of the power hydraulic pressure source; In the third state, the third cylinder is disconnected from the master cylinder and is connected to the second brake cylinder, which is at least one of the at least one brake cylinder of the second brake cylinder group, by the communication device. It is obtained by including an abnormality detection unit that detects an abnormality based on the hydraulic pressure of the brake system including the first brake cylinder and the second brake cylinder communicated with each other.
Further, in the hydraulic brake device according to claim 2, the hydraulic pressure of the brake system is changed to the first after the set time has elapsed since the abnormality detecting unit was switched from the first state to the third state. The hydraulic brake device according to claim 3, wherein the hydraulic brake device is obtained by including a hydraulic pressure corresponding abnormality detection unit that is abnormal when the hydraulic pressure is equal to or lower than a set hydraulic pressure determined by the hydraulic pressure of the first brake cylinder in a state. Is obtained by including an air detector for detecting the presence or absence of air in the brake system.

The power hydraulic pressure source may be a pump device or may include a pump device and an accumulator that stores high-pressure hydraulic fluid supplied from the pump.
Each of the first brake cylinder group and the second brake cylinder group includes at least one brake cylinder. Each of the first brake cylinder group and the second brake cylinder group may include one brake cylinder or two or more brake cylinders. However, there is no brake cylinder belonging to both the first brake cylinder group and the second brake cylinder group.

In the first state, the control device shuts off at least one of the at least one brake cylinder of the first brake cylinder group from the power hydraulic pressure source and allows the master cylinder to communicate with the master cylinder. The brake cylinders that are disconnected from the power hydraulic pressure source and communicated with the master cylinder are all brake cylinders included in the first brake cylinder group, even if they are all brake cylinders included in the first brake cylinder group. It may be a part of For example, when the first brake cylinder group includes two brake cylinders, the number of brake cylinders communicated with the master cylinder may be two or one.
In the second state, the control device shuts off at least one of the at least one brake cylinder of the first brake cylinder group from the master cylinder and communicates with the power hydraulic pressure source, and at least the second brake cylinder group. At least one of the brake cylinders is in communication with a power hydraulic source. The brake cylinders that are disconnected from the master cylinder and communicated with the power hydraulic pressure source may be all or some of the brake cylinders included in the first brake cylinder group, as described above. . Further, the brake cylinder disconnected from the master cylinder in the second state and communicated with the power hydraulic pressure source may be the same as or different from the brake cylinder communicated with the master cylinder in the first state. A brake cylinder communicated with the master cylinder in the first state may or may not be included.
The same applies to the brake cylinders communicated with the power hydraulic pressure source of the second brake cylinder group, and may be all or some brake cylinders included in the second brake cylinder group.
In the second state, the control device includes: (a) one or more solenoid valves capable of controlling the hydraulic pressure of the brake cylinder; and (b) a solenoid valve control unit that controls the one or more solenoid valves. It includes at least one of a control device and a hydraulic pressure source control device that controls the hydraulic pressure of hydraulic fluid supplied from the powered hydraulic pressure source to the brake cylinder by controlling the power supplied to the powered hydraulic pressure source. It is desirable that

The communication device communicates at least one of all brake cylinders included in the first brake cylinder group and at least one of all brake cylinders included in the second brake cylinder group. The communication device communicates all brake cylinders or some brake cylinders included in the first brake cylinder group with all brake cylinders or some brake cylinders included in the second brake cylinder group. It is desirable that all brake cylinders included in the first brake cylinder group and all brake cylinders included in the second brake cylinder be shut off in the first state. A solenoid valve is usually provided.
Therefore, the communication device, for example, opens a liquid passage that connects a brake cylinder included in the first brake cylinder group and a brake cylinder included in the second brake cylinder group, an electromagnetic valve provided in the liquid passage, and an electromagnetic valve. It can be comprised by the electromagnetic control part etc. to make.

The control device switches from the first state to the third state in a non-operating state of the power hydraulic pressure source. In the third state, the first brake cylinder (which may be referred to as a master hydraulic fluid storage brake cylinder), which is a brake cylinder supplied with hydraulic fluid from the master cylinder in the first state, is disconnected from the master cylinder, and the second brake A second brake cylinder (which can be referred to as a master hydraulic fluid supply target brake cylinder) that is at least one of all the brake cylinders in the cylinder group is communicated. The hydraulic fluid stored in the first brake cylinder is supplied to the second brake cylinder. The hydraulic pressure in the first brake cylinder, the hydraulic pressure in the second brake cylinder, and the hydraulic pressure in the fluid passage between them are the same.
For example, the hydraulic pressure of the brake system including the first brake cylinder, the second brake cylinder, and the fluid passage between them is lower when air is present in the brake system than when there is no air. Therefore, in the third state, it can be assumed that there is air in the brake system when the hydraulic pressure of the brake system is lower than the set pressure.
In the third state, when the hydraulic pressure of the second brake cylinder communicated with the first brake cylinder is detected by the brake hydraulic pressure sensor as the hydraulic pressure of the brake system, the hydraulic fluid is scheduled to be supplied. Based on whether or not the detection value by the sensor for detecting the hydraulic pressure of the second brake cylinder actually increases, it is also possible to detect an abnormality in the wiring of the signal lines such as the brake piping and the sensor.
In any case, in a hydraulic brake device including a master cylinder and a power hydraulic pressure source, an abnormality in the brake system is detected by using the hydraulic fluid of the master cylinder, and is supplied from the power hydraulic pressure source. We do not use the working fluid. Therefore, it is possible to detect abnormality while reducing energy consumption accordingly.
If it is already detected that the first brake cylinder is normal (for example, there is no air), the first brake cylinder of the brake system is changed based on the hydraulic pressure of the brake system in the third state. Abnormalities are detected in the parts other than the part.

In the third state, the number of the second brake cylinder communicated with the first brake cylinder may be one or two or more.
Moreover, the 2nd brake cylinder connected with a 1st brake cylinder can be changed in order, or can increase a number in order. In this way, it is possible to separately detect an abnormality in each of the brake systems including the plurality of second brake cylinders.
The hydraulic pressure of the brake system is detected by a hydraulic pressure sensor. The fluid pressure sensor detects the fluid pressure in the fluid passage between them, whether it detects the fluid pressure in the first brake cylinder or the fluid pressure in the second brake cylinder. It may be.

The hydraulic pressure in the third state is preferably detected after a set time has elapsed since the first state was switched to the third state. The set time can be, for example, a time required for the increase gradient of the hydraulic pressure in the second brake cylinder to be equal to or less than the set gradient. This is because the presence or absence of air may not be accurately detected even if the hydraulic pressure of the second brake cylinder is detected in a state where the increasing gradient with respect to time of the hydraulic pressure of the second brake cylinder is large. In other words, it is desirable that an abnormality be detected based on the hydraulic pressure when the brake system is in a steady state rather than a transient state.
The set pressure is determined by the hydraulic pressure of the first brake cylinder when in the first state. When the hydraulic pressure of the first brake cylinder in the first state is high, the hydraulic pressure of the brake system in the third state is higher than when the hydraulic pressure is low. Further, the set pressure is at least one of the number of first brake cylinders (total amount of master cylinder hydraulic fluid stored in the first brake cylinder) and the number of second brake cylinders (total capacity of the second brake cylinder). It is desirable to decide based on For example, when the hydraulic pressure of the first brake cylinder in the first state is the same and the number of the first brake cylinders is the same, the brake in the third state is less than when the number of the second brake cylinders is large. The system hydraulic pressure is low. Further, when the hydraulic pressure of the first brake cylinder in the first state is the same and the number of second brake cylinders is the same, the brake system in the third state is smaller than when the number of first brake cylinders is large. The hydraulic pressure increases.
In the third state, it may be abnormal when the amount of pressure reduction from the hydraulic pressure of the first brake cylinder in the first state is greater than or equal to the set amount. The pressure reduction amount in this case can also be determined based on one or more of the hydraulic pressure of the first brake cylinder, the number of first brake cylinders, and the number of second brake cylinders, as in the case described above. .

In the third state, the powered hydraulic pressure source is inactive. Therefore, the hydraulic fluid of the power hydraulic pressure source is not supplied to the brake system, and therefore the presence or absence of air in the brake system can be accurately detected. Further, when the power hydraulic pressure source includes an accumulator, it is necessary to allow the working fluid of the accumulator to flow out to a reservoir or the like before entering the third state (before abnormality detection is performed).
The non-operating state of the power hydraulic pressure source is a state in which hydraulic fluid is not supplied from the power hydraulic pressure source to the brake cylinder. For example, when a pump device is included, the pump is in a stopped state. Is included, the hydraulic fluid is not stored in the accumulator.

The hydraulic brake device according to claim 4, wherein, in the first state, the control device controls the operation amount of the brake operation member, and the hydraulic pressure of a brake system including the master cylinder and the first brake cylinder. A brake operation abnormality detection unit that detects the abnormality based on the relationship, and when the abnormality is not detected by the brake operation abnormality detection unit, the abnormality detection unit is switched to the third state. , Obtained by detecting the abnormality.
In the present hydraulic brake device, when it is detected that there is no air in the brake system including the master cylinder and the first brake cylinder, it is switched to the third state and the presence or absence of air in the brake system is detected. It will be.
Further, in the first state, there is no air when the relationship between the operation amount of the brake operation member and the hydraulic pressure of the brake system is appropriate, and there is air when the operation amount is larger than the hydraulic pressure. The In this case, when using a power hydraulic pressure source, an abnormality is detected due to the relationship between the amount of hydraulic fluid supplied from the power hydraulic pressure source and the hydraulic pressure of the brake system. In the hydraulic pressure source, there is a performance variation such as a discharge amount. In addition, it is necessary to detect the flow rate of the hydraulic fluid supplied from the power hydraulic pressure source. On the other hand, if the master cylinder is used, an abnormality can be detected with high accuracy based on the relationship between the operation stroke and the hydraulic pressure.
In the first state, a technique for detecting an abnormality based on the relationship between the operation stroke and the hydraulic pressure and a technique for switching to the third state when no abnormality is detected in the first state can be employed separately. Characteristic.

The hydraulic brake device according to claim 5, wherein the first brake cylinder group includes left and right front wheel brake cylinders, the second brake cylinder group includes left and right rear wheel brake cylinders, and the control device includes: In the first state, the left and right front wheel brake cylinders, which are the left and right front wheel brake cylinders, are communicated with the master cylinder, and in the second state, the left and right front wheel brake cylinders are disconnected from the master cylinder. A hydraulic braking control unit that communicates with the pressure source and communicates the brake cylinders of the left and right rear wheels with the power hydraulic pressure source; and in the third state, a first brake cylinder that is a brake cylinder of the left and right front wheels; A second brake cylinder which is at least one brake cylinder of the left rear wheel and the right rear wheel; Obtained by as including an abnormality detection time control unit to pass.
In this hydraulic brake device, the master cylinder is communicated with the left and right front wheel brake cylinders in the first state, and the left and right front wheel brake cylinders are disconnected from the master cylinder and communicated with the power hydraulic pressure source in the second state. The left and right rear wheel brake cylinders are communicated with the power hydraulic pressure source.
In the third state, the brake cylinders of the left and right front wheels and at least one of the right rear wheel and the left rear wheel are communicated. The communication device is a device for communicating the left and right front wheel brake cylinders with at least one of the left rear wheel and the right rear wheel.
The hydraulic fluid from the left and right front wheel brake cylinders is supplied to at least one of the right rear wheel and the left rear wheel. The left and right front wheel brake cylinders and the right rear wheel and the left rear wheel are braked. An abnormality is detected based on the hydraulic pressure of the brake system including the cylinder and the fluid passage between them.
The control device communicates the brake cylinder of the right rear wheel with the brake cylinder of the right and left front wheels, detects an abnormality in the brake system including the brake cylinder of the right rear wheel, and then changes from the brake cylinder of the right and left front wheels to the brake cylinder of the right rear wheel. And the brake cylinder of the left rear wheel is connected to detect an abnormality in the brake system including the brake cylinder of the left front wheel (when the second brake cylinder is changed in order), After detecting the abnormality by communicating one of the brake cylinders with the left rear wheel, the abnormality is detected by communicating both the brake cylinders of the left and right rear wheels (the second brake cylinder in turn) ), The left and right rear wheel brake cylinders are connected to the left and right front wheel brake cylinders to detect an abnormality. Benefit can be.

The hydraulic brake device according to claim 6 is (a) a master cylinder that generates hydraulic pressure in accordance with the operation of the brake operation member by the driver, and (b) is supplied with power and is supplied with hydraulic fluid. A possible hydraulic fluid pressure source; and (c) a plurality of brake cylinders including at least one master communication brake cylinder communicated with or communicated with the master cylinder; and (d) A first state in which at least one of the at least one master communication brake cylinder is disconnected from the power hydraulic pressure source and communicated with the master cylinder; and at least one of the at least one master communication brake cylinder is A hydraulic brake device including a control device capable of switching to a second state in which the master cylinder is disconnected and communicated with the power hydraulic pressure source;
A communication device for communicating at least one of all of the master communication brake cylinders and at least one brake cylinder different from at least one of the master communication brake cylinders;
A master hydraulic fluid that is at least one of the at least one master communication brake cylinder that accumulates the hydraulic fluid supplied from the master cylinder in the first state when the power hydraulic pressure source is in an inoperative state. The accumulating brake cylinder is disconnected from the master cylinder, and a fourth state is established in which the communicating device communicates with a working fluid supply target brake cylinder which is at least one brake cylinder other than the at least one master working fluid accumulating brake cylinder. In addition, the fourth state is obtained by including an abnormality detection unit that detects an abnormality based on the hydraulic pressure of the brake system including the master operation accumulation brake cylinder and the hydraulic fluid supply target brake cylinder.

The hydraulic brake device includes a plurality of brake cylinders, and at least one of the plurality of brake cylinders is a master communication brake cylinder. Even if all of the plurality of brake cylinders are master communication brake cylinders, some of the plurality of brake cylinders may be master communication brake cylinders. In any case, the controller switches between a first state in which at least one of the master communication brake cylinders is in communication with the master cylinder and a second state in which the master communication brake cylinder is in communication with the power hydraulic pressure source.
In the case of detecting an abnormality, a hydraulic fluid supply target brake in which the master hydraulic fluid accumulation brake cylinder, which is at least one of the master communication brake cylinders communicated with the master cylinder in the first state, is another brake cylinder. Communicated with the cylinder. The hydraulic fluid supply target brake cylinder may be a master communication brake cylinder or a brake cylinder that is not.
In any case, the abnormality is detected using the hydraulic fluid of the master cylinder, and the energy consumption is reduced compared to the case where the hydraulic fluid supplied from the power hydraulic pressure source is used. Can do so.
In the hydraulic brake device according to the sixth aspect, the technical features described in the first to fifth aspects and the technical features described in the description of the inventions in the first to fifth aspects can be employed.

The hydraulic brake device according to claim 7 is (a) a master cylinder that generates hydraulic pressure in accordance with the operation of a brake operation member by a driver, and (b) is supplied with power and is supplied with hydraulic fluid. A possible power-type hydraulic pressure source; and (c) a first brake cylinder group including at least one brake cylinder communicated with the master cylinder or communicated with the power-type hydraulic pressure source; A second brake cylinder group including at least one brake cylinder different from a brake cylinder included in the first brake cylinder group; and (e) at least one of the at least one brake cylinder of the first brake cylinder group. Is disconnected from the power hydraulic pressure source and communicated with the master cylinder, and the at least one brake of the first brake cylinder group. At least one cylinder is disconnected from the master cylinder and communicated with the power hydraulic pressure source, and at least one brake cylinder of the second brake cylinder group is communicated with the power hydraulic pressure source. A hydraulic brake device including a control device switchable to a second state,
A communication device for communicating at least one of the at least one brake cylinder of the first brake cylinder group with at least one of the at least one brake cylinder of the second brake cylinder group;
The control device causes the first brake cylinder, which is at least one of the at least one brake cylinder of the first brake cylinder group, to communicate with the master cylinder in a non-operating state of the power hydraulic pressure source, and to communicate with the master cylinder. The apparatus is in a fifth state in which the second brake cylinder, which is at least one of the at least one brake cylinder of the second brake cylinder group, communicates with the first brake cylinder, and in the fifth state, It is obtained by including an abnormality detection unit that detects an abnormality based on the relationship between the hydraulic pressure of the brake system including the brake cylinder and the operation amount of the brake operation member.
In the hydraulic brake device, the first brake cylinder is communicated with the master cylinder, and the first brake cylinder and the second brake cylinder are communicated with each other via the communication device. Therefore, both the first brake cylinder and the second brake cylinder are communicated with the master cylinder, and abnormality is detected using the hydraulic fluid of the master cylinder. Further, there is an advantage that an abnormality in the brake system including the first brake cylinder of the first brake cylinder group and the second brake cylinder of the second brake cylinder group can be detected at a time.
The fifth state is a state that is set when abnormality detection is performed, and is a state that is not set when the vehicle is braked by the hydraulic pressure of the brake cylinder. In this sense, the fifth state can be referred to as an abnormality detection state and an abnormality detection mode.
In the hydraulic brake device according to a seventh aspect, the technical features described in the first to sixth aspects and the technical features described in the description of the inventions in the first to sixth aspects can be employed.

BEST MODE FOR CARRYING OUT THE INVENTION

A hydraulic brake device according to an embodiment of the present invention will be described in detail with reference to the drawings.
The hydraulic brake device shown in FIG. 1 corresponds to a brake pedal 10 as a brake operation member, a master cylinder 12 including two pressurizing chambers, a powered hydraulic pressure source 14 operated by power, and wheels located on the front and rear sides. And brakes 16 to 19 and the like provided for each. The brakes 16 and 17 are left and right front wheel brakes, and the brakes 18 and 19 are left and right rear wheel brakes. The brakes 16 to 19 are hydraulic brakes that are operated by the hydraulic pressure of the brake cylinders 20 to 23.
The master cylinder 12 includes two pressure pistons, and fluid pressure corresponding to the operation force is generated in the fluid pressure chambers in front of the two pressure pistons by operating the brake pedal 10 by the driver. Be made. The two front pressure chambers of the master cylinder 12 are connected to the left front wheel brake cylinder 20 and the right front wheel brake cylinder 21 via master passages 26 and 27, respectively. Master cutoff valves 29 and 30 are provided in the middle of the master passages 26 and 27, respectively. The master shut-off valves 29 and 30 are normally open electromagnetic on-off valves.
Further, four brake cylinders 20 to 23 are connected to the pump device 14 via a pump passage 36. The pump passage 36 includes a common pump passage 38 and individual pump passages 40 to 43. The brake cylinders 20 to 23 are supplied with hydraulic pressure from the power hydraulic pressure source 14 while being disconnected from the master cylinder 12, and the hydraulic brakes 16 to 19 are operated. The hydraulic pressure of the brake cylinders 20 to 23 is controlled by a hydraulic pressure control valve device 46.

The power hydraulic pressure source 14 includes a pump device 56 including a pump 52 and a pump motor 54 that drives the pump 52, and an accumulator 58. The suction side of the pump 52 is connected to the reservoir 62 via the suction passage 60, and the accumulator 58 is connected to the discharge side. The hydraulic fluid in the reservoir 62 is pumped up by the pump 52, supplied to the accumulator 58, and stored in a pressurized state.
Further, a portion on the downstream side (brake cylinder side) of the discharge side accumulator 58 of the pump 52 and a portion on the suction side of the pump 52 are connected by a relief passage 74. A relief valve 76 is provided in the relief passage 74. The relief valve 76 is switched from the closed state to the open state when the hydraulic pressure on the accumulator side, which is the high pressure side, exceeds the set pressure.

The hydraulic control valve device 46 is a pressure reducing valve provided in a pressure increasing linear valve 150 to 153 provided in each of the individual pump passages 40 to 43 and a pressure reducing passage 156 connecting the brake cylinders 20 to 23 and the reservoir 62. Pressure reducing linear valves 160 to 163. The decompression passage 156 also includes a common decompression passage 170 and individual decompression passages 172 to 175, and the decompression linear valves 160 to 163 are provided in the individual decompression passages 172 to 175. The hydraulic pressures of the brake cylinders 20 to 23 can be individually and independently controlled by the control of the pressure increasing linear valves 150 to 153 and the pressure reducing linear valves 160 to 163.
The pressure-increasing linear valves 150 to 153 and the front wheel side pressure reducing linear valves 160 and 161 are normally closed electromagnetic control valves, and the rear wheel side pressure reducing linear valves 162 and 163 are normally open electromagnetic control valves. These pressure-increasing linear valves 150 to 153 and pressure-decreasing linear valves 160 to 163 include a solenoid and a seating valve, and can control the differential pressure between the front and rear by controlling the supply current to the solenoid. The hydraulic pressure in the cylinders 20 to 23 is controlled.

  A stroke simulator device 180 is provided in the master passage 26. The stroke simulator device 180 includes a stroke simulator 182 and a normally closed simulator opening / closing valve 184, and the opening / closing of the simulator opening / closing valve 184 prevents the stroke simulator 182 from communicating with the master cylinder 12. Switched to the shut-off state. In the present embodiment, when the hydraulic brakes 16 to 19 are in a state of being operated by the hydraulic fluid from the power hydraulic pressure source 14, the hydraulic brakes 16 to 19 are in an open state and are operated by the hydraulic fluid from the master cylinder 12. If it is, it is closed.

The hydraulic brake device is controlled based on a command from the brake ECU 200. The brake ECU 200 mainly includes a computer, and includes an execution unit 202, a storage unit 204, an input / output unit 206, and the like. The input / output unit 206 is connected with a stroke sensor 211, a master pressure sensor 214, brake fluid pressure sensors 216 to 219, a wheel speed sensor 220, an accumulator pressure sensor 221, a shift position sensor 222, a parking brake switch 223, and the like. The pressure-increasing linear valves 150 to 153, the pressure-decreasing linear valves 160 to 163, the master shut-off valves 29 and 30, the simulator control valve 184, the electric motor 54, and the like are connected via a drive circuit (not shown), and the notification device 228 is connected. The
The stroke sensor 211 detects the operation stroke of the brake pedal 10, and the brake hydraulic pressure sensors 216 to 219 detect the hydraulic pressures of the left and right brake cylinders 20 to 23, respectively. The shift position sensor 222 detects the position of a shift lever (not shown) that can be operated by the driver, and the parking brake switch 223 detects whether a parking brake operation member (not shown) is in an operating state. is there. The notification device 228 notifies the operator of an operation instruction and an operation release instruction for the brake pedal 10 when detecting the presence or absence of air, and may include, for example, a display. An image representing “brake pedal operation”, “operation release” and the like is created and displayed on the display. An operator who detects the presence or absence of air operates the brake pedal 10 according to the display on the display. Note that the notification device 228 may be a sound generation device that generates sound or may emit sound or light. When the operator knows in advance that the brake pedal 10 will be operated, it is sufficient to emit a sound such as a buzzer, light, or the like.
The storage unit 204 stores an abnormality detection program represented by the flowchart of FIG.

During normal braking, the master shutoff valves 29 and 30 are closed, so that the brake cylinders 20 to 23 are shut off from the master cylinder 12 so that hydraulic fluid can be supplied from the power hydraulic pressure source 14. The driver's required braking force is obtained based on at least one of the master pressure detected by the master pressure sensor 214 and the operation stroke detected by the stroke sensor 211, and the brake cylinder hydraulic pressure is adjusted so that the required braking force is obtained. A target hydraulic pressure is determined. The supply current to the electric motor 54 of the power hydraulic pressure source 14 and the solenoids of the pressure-increasing linear valves 150 to 153 and the pressure-reducing linear valves 160 to 163 are set so that the actual brake cylinder hydraulic pressure becomes the same as the target hydraulic pressure. At least one of the supply current and the current is controlled.
Further, the braking slip state of each wheel is obtained based on the wheel speed detected by the wheel speed sensor 220 during braking, and when it is detected that the braking slip is large, anti-lock control is performed. In the anti-lock control, the hydraulic pressure of each brake cylinder is controlled by the hydraulic control valve device 46 according to the execution of the anti-lock control program so that the braking slip of each wheel becomes an appropriate magnitude with respect to the friction coefficient of the road surface. It is controlled independently by control.
When the hydraulic pressure of the brake cylinder is not controlled (for example, when an abnormality occurs in the electric system), each solenoid valve is in the original position shown in the figure. By opening the master shut-off valves 29 and 30, the brake cylinders 20 and 21 for the left and right front wheels are brought into communication with the master cylinder 12. The brakes 16 and 17 are operated by supplying the hydraulic fluid from the master cylinder 12 to the brake cylinders 20 and 21. A hydraulic pressure is generated in the brake cylinders 20 and 21 according to the operation state of the brake pedal 10.

  In the present embodiment, the state in which the left and right front wheel brake cylinders 20 and 21 are communicated with the master cylinder 12 is the first state, and the power hydraulic pressure is applied to all the brake cylinders 20 to 23 of the left and right front wheels and the left and right rear wheels. The state in which hydraulic fluid can be supplied from the source 14 is the second state. In the second state, all the brake cylinders 20 to 23 are not always in communication with the power hydraulic pressure source 14, but at least the target hydraulic pressure of the brake cylinders 20 to 23 is increasing. In some cases, the power hydraulic pressure source 14 is communicated. The left and right front wheel brake cylinders 20 and 21 belong to the first brake cylinder group, and the left and right rear wheel brake cylinders 22 and 23 belong to the second brake cylinder group. The brake cylinders 20 and 21 for the left and right front wheels are also master communication brake cylinders.

In this brake device, the presence / absence of air is detected in a factory or the like.
The abnormality detection is performed when the air presence / absence detection permission condition is satisfied.
The air presence / absence detection permission condition (inspection mode start condition) is established when at least one of the shift lever position being parked and the parking brake being in an operating state is satisfied. In other words, when the shift lever position is parking, the parking brake is activated, the shift lever position is parking, and the parking brake is activated. It is said. This is a state in which the vehicle can be kept stopped regardless of the operating state of the hydraulic brakes 16 to 19 which are service brakes. In this case, the pump device 56 is in a stopped state.
Before the presence / absence of air is detected, first, the hydraulic fluid stored in the accumulator 58 is returned to the reservoir 62. In the present embodiment, the pressure-increasing linear valves 152 and 153 for the rear wheels are opened, whereby the hydraulic fluid in the accumulator 58 is the pressure-increasing linear valves 152 and 153 and the pressure-reducing linear valves that are normally open valves. It returns to the reservoir 62 through 162 and 163.
Since the rear wheel pressure-reducing linear valves 162 and 163 are normally open valves, power consumption can be suppressed compared to when the left and right front wheel pressure-increasing linear valves 150 and 151 and the pressure-reducing linear valves 160 and 161 are opened.
If the pressure increasing linear valves 150 and 151 and the pressure reducing linear valves 160 and 161 on the left and right front wheels are also opened, the accumulator 58 is communicated with the reservoir 62 via the pressure increasing linear valves 150 to 153 and the pressure reducing linear valves 160 to 163. Therefore, the hydraulic fluid can be quickly returned to the reservoir 62.

Next, with the master cylinder 12 in communication with the brake cylinders 20 and 21 of the left and right front wheels, at least one of the operation stroke of the brake pedal 10, the hydraulic pressure of the master cylinder 12, and the hydraulic pressure of the brake cylinders 20 and 21. The presence or absence of air in the first brake system 230 is detected based on the relationship. The first brake system is a system including the master cylinder 12, the fluid passages 26 and 27, and the brake cylinders 20 and 21.
It is known that there is a relationship shown in FIG. 3 between the consumption amount of hydraulic fluid and the hydraulic pressure. Further, the consumption amount of the hydraulic fluid increases as the operation stroke of the brake pedal 10 increases. Therefore, the operation stroke becomes larger when the hydraulic pressure of the brake cylinder or the like is the same than when there is no air in the first brake system 230.
When the hydraulic pressure of the master cylinder 12 or the brake cylinders 16 and 17 and the operation stroke are in an appropriate relationship, there is no air in the first brake system 230, and when the operation stroke is large relative to the hydraulic pressure, the air It is said that there is.
In the present embodiment, air is considered to be present when the operation stroke when the hydraulic pressure of the master cylinder reaches the first set pressure is greater than or equal to the set stroke, and the set stroke is greater than the set value by more than the appropriate stroke. It is a value that can be detected when there is air.

  When an abnormality is detected based on the relationship between the operation stroke and the hydraulic pressure of the brake system, it is not based on the master cylinder pressure but on the brake cylinder hydraulic pressure of the front wheels detected by the brake hydraulic pressure sensors 216 and 217. Anomaly detection can also be performed. Further, even if the abnormality is detected based on the relationship between the operation stroke and the hydraulic pressure during the depression (while the brake operation amount is increasing), the abnormality is detected during the return (while the brake operation amount is decreasing). You may do it. If an abnormality is detected in the middle of depression, the effect of the operating speed of the brake pedal 10 is less affected by the brake cylinder fluid pressure, so the fluid pressure detection accuracy is improved and the presence or absence of air is detected accurately. can do.

  When there is no air in the first brake system 230, the master shut-off valves 29 and 30 are shut off, and the left and right front wheel boost linear valves 150 and 151 and the left rear wheel boost linear valve 152 is opened, and the pressure reducing linear valve 162 for the left rear wheel is closed. Accordingly, the brake cylinders 20 and 21 for the left and right front wheels are disconnected from the master cylinder 12 and communicated with the brake cylinder 22 for the left rear wheel. Further, the hydraulic fluid is prevented from flowing out from the brake cylinder 22 of the left rear wheel to the reservoir 62. Further, the pump device 56 is in a non-operating state and the working fluid is not supplied from the accumulator 58. Therefore, the hydraulic fluid is not supplied from the power hydraulic pressure source 14 to the brake cylinder. This state is the third state, which is not realized when the vehicle is braked by hydraulic pressure. In this sense, the third state can be referred to as an abnormality detection state and an abnormality detection mode.

  In the third state, hydraulic fluid is supplied from the left and right front wheel brake cylinders 20, 21 to the left rear wheel brake cylinder 22, and the hydraulic pressures of these brake cylinders 20, 21, 22 are the same. This hydraulic pressure is a second set pressure (the second set pressure is smaller than the first set pressure) determined by the hydraulic pressure of the brake cylinders 20 and 21 of the left and right front wheels in the first state (the first set pressure in this embodiment). Value). When the hydraulic pressures of these brake cylinders 20 to 22 are larger than the first air detection set pressure determined by the second set pressure (the first air detection set pressure is smaller than the second set pressure), the brake cylinder 22, There is no air in the second brake system 232 including the individual pump passages 40, 41, and 42 (has already been confirmed that the brake cylinders 20 and 21 are free of air), and the hydraulic pressure in the brake cylinders 20 to 22 is reduced. It is assumed that there is air in the second brake system 232 when the pressure is smaller than the first air detection set pressure.

If there is no air in the second brake system 232, the pressure increasing linear valve 153 for the right rear wheel is further opened and the pressure reducing linear valve 163 is closed. The four brake cylinders 20 to 23 are communicated with each other and the hydraulic fluid from the right rear wheel brake cylinder 23 is prevented from flowing into the reservoir 62. This state is also the third state. The brake cylinders 20 and 21 and the brake cylinders 22 and 23 are brought into communication with each other when the pressure-increasing linear valves 150 to 153 are opened. In this state, since hydraulic fluid is supplied from the brake cylinders 20, 21, 22 to the brake cylinder 23 of the right rear wheel, the hydraulic pressures of these brake cylinders 20, 21, 22, 23 are substantially the same, and the above-described first It should be the third set pressure determined by the 2 set pressure (a value smaller than the second set pressure). When the hydraulic pressure of these brake cylinders 20 to 23 is larger than the second air detection set pressure determined by the third set pressure (a value smaller than the third set pressure), the right rear wheel brake cylinder 23 and the individual pump passage 43 are connected. It is assumed that there is no air in the third brake system 234 including the air, and that there is air in the third brake system 234 when the hydraulic pressure of the brake cylinders 20 to 23 is smaller than the second air detection set pressure.
The magnitudes of the first, second and third set pressures and the first and second air detection hydraulic pressures are schematically shown in FIG.
In the third state, an abnormality can be detected based on the amount of decrease in the brake cylinder pressure. In the third state, the brake cylinder hydraulic pressure is lower than that in the first state, but it is abnormal when the reduced brake cylinder hydraulic pressure is greater than or equal to the set reduction. . In this way, it is possible to detect an abnormality without depending on the temperature characteristics of the hydraulic pressure sensor. The setting decrease amount can be determined in the same manner as described above.

The air presence / absence detection program is represented by the flowchart of FIG. FIG. 5 shows the current supply state to the solenoid of each solenoid valve when air presence / absence detection is performed.
In step 1 (hereinafter abbreviated as S1, the same applies to other steps), it is confirmed that the air detection permission condition is satisfied. When detecting the presence or absence of air, it is determined that the shift position is set to parking and the parking brake is operated. When the air detection permission condition is satisfied, the working fluid in the accumulator 58 is allowed to flow out until the fluid pressure reaches atmospheric pressure. In S2, the pressure-increasing linear valves 152 and 153 are opened, and in S3, it is determined whether or not the accumulator pressure detected by the accumulator pressure sensor 221 has become almost atmospheric pressure. S2 and 3 are repeatedly executed until the accumulator pressure becomes atmospheric pressure.
If the atmospheric pressure is reached, an instruction to operate the brake pedal 10 is notified by the notification device 228 in S4.
In S5, the master cylinder pressure or the brake cylinder pressure of the front wheels is detected, and it is determined whether or not the first set pressure P1 has been reached. When the first set pressure P1 is reached, an operation stroke is detected in S6, and it is determined whether or not it is longer than the set stroke L. If it is equal to or less than the set stroke, it is determined that there is no air in the first brake system 230 in S7, and if it is greater than the set stroke, it is determined that there is air in the first brake system 230 in S8.

When it is determined that there is air in the first brake system 230, S7 and S9 and subsequent steps are not executed.
Further, when the master cylinder pressure or the brake cylinder pressure of the front wheel reaches the first set pressure P1, and the master shut-off valves 29 and 30 are closed, the operation release of the brake pedal 10 is notified.

If there is no air in the first brake system 230, the master shut-off valves 29 and 30 are closed in S9. The hydraulic pressure of the brake cylinders 20 and 21 for the left and right front wheels is the first set pressure.
In S10, the pressure increasing linear valves 150 and 151 for the left and right front wheels, the pressure increasing linear valve 152 for the left rear wheel are opened, and the pressure reducing linear valve 162 for the left rear wheel is closed. In this case, the pressure increasing linear valve 153 for the right rear wheel is returned to the closed state. The hydraulic pressures of the brake cylinders 20, 21, 22 after the set time has elapsed are detected, and it is determined whether or not the hydraulic pressure Pe1 is equal to or higher than the first air detection hydraulic pressure Pe1. If the pressure is equal to or higher than the first air detection hydraulic pressure Pe1, no air is present in the second brake system 232 in S12. If it is lower than the first air detection hydraulic pressure Pe1, the second brake system 232 is determined in S13. It is said that there is air in.

  If it is determined that there is no air in the second brake system 232, current is further supplied to the solenoids of the pressure increasing linear valve 153 and the pressure reducing linear valve 163 of the right rear wheel in S14. The front, rear, left and right brake cylinders 20 to 23 are communicated with each other. In this state, after the set time elapses, the hydraulic pressures of the brake cylinders 20 to 23 are detected, and it is determined whether or not the hydraulic pressure is Pe2 or higher. If the pressure is equal to or higher than the second air detection hydraulic pressure Pe2, no air is present in the third brake system 234 in S16, and if it is smaller than the second air detection hydraulic pressure Pe2, air is supplied to the third brake system 234 in S17. It is supposed to be.

  After the detection of the presence / absence of air is completed, no current is supplied to the solenoids of all the solenoid valves. The hydraulic fluid in the left and right rear brake cylinders 22 and 23 is returned to the reservoir 62 via the pressure-reducing linear valves 162 and 163, and the hydraulic fluid in the left and right front brake cylinders 20 and 21 is supplied to the master shut-off valves 29 and 30 and the master cylinder 12. After that, it is returned to the reservoir 62. Further, if the pressure reducing linear valves 160 and 161 for the left and right front wheels are opened for a set time before the master shut-off valves 29 and 30 are returned to the open state, the brake cylinders 22 and 23 for the left and right front wheels are communicated with the reservoir 62. The hydraulic fluid can be returned. Furthermore, if the pressure-reducing linear valves 160 and 161 are opened after the master shut-off valves 29 and 30 are opened, the hydraulic fluid of the brake cylinders 20 and 21 for the left and right front wheels can be quickly returned.

In this way, the presence or absence of air in the first to third brake systems 230 to 234 is detected using the hydraulic fluid supplied from the master cylinder 12 instead of the hydraulic fluid supplied from the power hydraulic pressure source 14. Done. Therefore, it is not necessary to operate the power hydraulic pressure source 14 for detecting the presence / absence of air, and the power consumption can be reduced in detecting the presence / absence of air.
In addition, the presence or absence of air in the first brake system 230 is detected, and the left rear wheel brake cylinder 22 and the right rear wheel brake cylinder 23 are connected to the left and right front wheel brake cylinders 20 and 21 in order. The presence or absence of air in the second brake system 232 and the presence or absence of air in the third brake system 234 can be detected separately.
Furthermore, if the left and right front wheel brake cylinders 20 and 21 are connected to the left rear wheel brake cylinder 22 and the right rear wheel brake cylinder 23 in this order, it is possible to check the piping. If the hydraulic pressure of the brake cylinder to which the hydraulic fluid is to be supplied does not increase, there is a possibility that the piping or the signal wiring of the brake hydraulic pressure sensor is incorrect. In the case where a sensor or the like for detecting the hydraulic pressure of the brake cylinder is not provided, piping can be checked by connecting the brake cylinder in order and rotating the wheel with a drum tester or the like.
In addition, since the hydraulic fluid of the master cylinder 12 is stored in the two brake cylinders 20 and 21 of the left and right front wheels, the brake cylinder 22 of the left rear wheel and the brake cylinder 23 of the right rear wheel are more than stored in one brake cylinder. When communicating, it is possible to suppress a decrease in the hydraulic pressure of the second brake system 232 and to accurately detect the presence or absence of air.
Furthermore, in the present embodiment, in the first state, an abnormality is detected based on the relationship between the operation stroke and the hydraulic pressure using the master cylinder 12. When using the power hydraulic pressure source 14, an abnormality is detected based on the relationship between the amount of hydraulic fluid supplied from the power hydraulic pressure source 14 and the hydraulic pressure. In this case, There are variations in the discharge amount of the power hydraulic pressure source 14. In addition, a flow sensor that detects the amount of hydraulic fluid supplied from the power hydraulic pressure source 14 is required. On the other hand, if the master cylinder 12 is used, a flow rate sensor becomes unnecessary, and it becomes unnecessary to consider the performance variation of the power type hydraulic pressure source 14, so that an abnormality can be detected accurately while avoiding an increase in cost. it can.
In the present embodiment, the communication device is configured by the individual pump passages 40 to 43, the pressure-increasing linear valves 150 to 153, the part that stores S10 and 14 of the brake ECU 200, the part that executes the parts, and the like. The left and right front wheel brake cylinders are master hydraulic fluid accumulation brake cylinders.

In the above embodiment, after the detection of the presence or absence of air in the first brake system 230 is completed, the left and right front wheel brake cylinders 20 and 21 are connected to the left rear wheel brake cylinder 22, and then the right Although the rear wheel brake cylinders 23 are further communicated with each other, the left and right rear wheel brake cylinders 22, 23 may be communicated simultaneously. The master shut-off valves 29 and 30 are closed, the pressure-increasing linear valves 150 to 153 are opened, and the pressure-reducing linear valves 162 and 163 are closed. In this way, the presence or absence of air in the brake system including the individual pump passages 40 to 43 and the brake cylinders 22 and 23 can be detected. Further, the time required for detecting the presence or absence of air can be shortened.
Also, the left rear wheel brake cylinder 22 is communicated with the left and right front wheel brake cylinders 20, 21, and then the left rear wheel brake cylinder 22 is shut off and communicated with the right rear wheel brake cylinder 23. You can also.

Further, in the above-described embodiment, the brake cylinders 20 and 21 for the left and right front wheels are communicated with the master cylinder 12 and the hydraulic fluid is stored in the two brake cylinders 20 and 21. The hydraulic fluid can be stored in any one of 20, 21. For example, the fourth brake system including the brake cylinder 20 and the fluid passage 26 based on the relationship between the hydraulic pressure of the brake cylinder 20 and the operation stroke by opening the master cutoff valve 29 and closing the master cutoff valve 30. The presence or absence of air inside is detected.
If there is no air in the fourth brake system, the master shut-off valve 29 is closed and the pressure-increasing linear valves 150 and 151 are opened. Thereby, the brake cylinders 20 and 21 of the left and right front wheels are communicated with each other in a state where they are disconnected from the master cylinder 12. This state is the fourth state. The hydraulic fluid of the brake cylinder 20 is supplied to the brake cylinder 21, and these hydraulic pressures become the same. When the hydraulic pressure of the brake cylinders 20 and 21 is equal to or higher than the set pressure, there is no air in the fifth brake system including the individual pump passages 40 and 41 and the brake cylinder 21. It is assumed that there is air in the 5 brake system.
Hereinafter, as in the case of the above-described embodiment, the left and right rear brake cylinders 22 and 23 can be sequentially communicated to detect the presence or absence of air in each brake system.

Further, in a state (fifth state) in which at least one brake cylinder of the left and right front wheels and at least one brake cylinder of the left and right rear wheels are in communication with the master cylinder 12, based on the relationship between the hydraulic pressure of the brake cylinder and the operation stroke. Thus, the presence or absence of air can be detected.
For example, when the master shut-off valve 30 is closed, the master shut-off valve 29 is opened, the pressure-increasing linear valves 150 and 152 are opened, and the pressure-reducing linear valve 162 is closed, the master cylinder 12 has a left front wheel. The brake cylinder 20 and the left rear wheel brake cylinder 22 can be communicated with each other. The hydraulic fluid in the master cylinder 12 is supplied to the brake cylinders 20 and 22. When the relationship between the operation stroke of the brake pedal 10 and the hydraulic pressure of the brake cylinders 20 and 22 is appropriate, the sixth brake system including the liquid passage 26, the brake cylinder 20, the individual pump passages 40 and 42, and the brake cylinder 22. If there is no air inside and the operation stroke is larger than the hydraulic pressure, it is assumed that there is air in the sixth brake system.
Hereinafter, if the master shutoff valve 29 is closed and the brake cylinders 20 and 22 are made to communicate with the brake cylinder 21 for the right front wheel and the brake cylinder 23 for the right rear wheel in this order, the seventh passage including the individual passage 41 and the brake cylinder 21 will be described. The presence or absence of air in the brake system and the presence or absence of air in the third brake system 234 can be detected.

  The master cylinder 12 is connected to the brake cylinder 21 for the right front wheel and the brake cylinder 23 for the right rear wheel in an eighth state including the liquid passage 27, the brake cylinder 21, the individual passages 41 and 43, and the brake cylinder 23. The presence or absence of air in the brake system is detected, or the master cylinder 12 is connected to a three-wheel brake cylinder including brake cylinders 20 and 21 for the left and right front wheels and at least one brake cylinder for the left and right rear wheels. The presence / absence of air can be detected in the closed state, or the presence / absence of air can be detected in a state where the four brake cylinders 20 to 23 of the left and right front and rear wheels are connected.

In the flowchart of FIG. 6, after the hydraulic fluid has flowed out of the accumulator 58, in S <b> 3 ′, the pressure increasing linear valves 150, 151, and 152 are opened and current is supplied to the solenoid of the left rear wheel pressure reducing linear valve 162. It is closed by being supplied. Since the master shut-off valves 29 and 30 are in an open state, the left and right front wheel brake cylinders 20 and 21 and the left rear wheel brake cylinder 22 are communicated with the master cylinder 12. In this state, it is determined whether or not the operation stroke when the hydraulic pressure in the brake cylinders 20 to 22 reaches the set pressure is greater than the set stroke. If it is less than the set stroke, there is no air in the ninth brake system including the liquid passages 26 and 27, the brake cylinders 20 and 21, the individual pump passages 40, 41 and 42, and the brake cylinder 22, If it is larger, it is assumed that there is air in the ninth brake system.
Also in this embodiment, the presence or absence of air is detected using the hydraulic fluid of the master cylinder 12 without using the hydraulic fluid of the power hydraulic pressure source 14.
Further, since the hydraulic fluid of the motive power hydraulic pressure source 14 is not used, a flow sensor or the like is not necessary, and the performance variation of the motive power hydraulic pressure source 14 is not affected. Therefore, it is possible to accurately detect an abnormality while avoiding an increase in cost.
It should be noted that the relationship between the operation stroke and the brake cylinder hydraulic pressure can be detected either in the middle of stepping on or in the middle of returning, or both.

Further, a check valve that allows the flow of hydraulic fluid from the power hydraulic pressure source 14 toward the brake cylinder and prevents the reverse flow is provided on the discharge side of the power hydraulic pressure source 14 (downstream of the accumulator 58). Can be provided. According to the check valve, it is possible to reliably prevent the flow of hydraulic fluid from the brake cylinder toward the power hydraulic pressure source 14 while detecting the presence or absence of air.
Further, the present invention can be applied not only in a factory but also in detecting the presence or absence of air during normal traveling.

  The present invention can be practiced in various modifications and improvements based on the knowledge of those skilled in the art, in addition to the aspects described in [Problems to be Solved by the Invention, Problem Solving Means and Effects].

It is a circuit diagram of the whole brake device which is one embodiment of the present invention. It is a flowchart showing the air presence detection program memorize | stored in the memory | storage part of brake ECU of the said brake device. It is a figure which shows the relationship between the consumption liquid amount and hydraulic pressure in the said brake device. It is a figure showing the magnitude | size of the setting value used in execution of the said air presence / absence detection program. It is a figure which shows the supply state of the electric current to the solenoid of each solenoid valve accompanying execution of the said air presence / absence detection program. It is a flowchart showing the air presence detection program memorize | stored in the memory | storage part of brake ECU of the brake device which is another one Embodiment of this invention.

Explanation of symbols

12: Master cylinder 14: Pump device 20-23: Brake cylinder 200: Brake ECU 211: Stroke sensor 216-219: Brake fluid pressure sensor

Claims (7)

A master cylinder that generates hydraulic pressure in accordance with the operation of the brake operation member by the driver;
A powered hydraulic pressure source that is actuated by power supply and capable of supplying hydraulic fluid;
A first brake cylinder group including at least one brake cylinder communicated with the master cylinder or communicated with the power hydraulic pressure source;
A second brake cylinder group including at least one brake cylinder different from the brake cylinders included in the first brake cylinder group;
A first state in which at least one of the at least one brake cylinder in the first brake cylinder group is disconnected from the power hydraulic pressure source and communicated with the master cylinder; and at least the first brake cylinder group in the first state. At least one brake cylinder is disconnected from the master cylinder and communicated with the power hydraulic pressure source, and at least one brake cylinder of the second brake cylinder group is connected to the power hydraulic pressure source. A hydraulic brake device including a control device switchable to a second state communicating with
A communication device for communicating at least one of the at least one brake cylinder of the first brake cylinder group with at least one of the at least one brake cylinder of the second brake cylinder group;
The control device includes a first brake cylinder that is a brake cylinder supplied with hydraulic fluid from the master cylinder in the first state of the first brake cylinder group in a non-operating state of the power hydraulic pressure source. In the third state, the third cylinder is disconnected from the master cylinder and is connected to the second brake cylinder, which is at least one of the at least one brake cylinder of the second brake cylinder group, by the communication device. A hydraulic brake device including an abnormality detecting unit that detects an abnormality based on a hydraulic pressure of a brake system including the first brake cylinder and the second brake cylinder. A setting in which the hydraulic pressure of the brake system is determined by the hydraulic pressure of the first brake cylinder in the first state after a set time has elapsed since the abnormality detection unit was switched from the first state to the third state. 2. The hydraulic brake device according to claim 1, further comprising a hydraulic pressure corresponding abnormality detecting unit that is abnormal when the pressure is equal to or lower than the hydraulic pressure. The hydraulic brake device according to claim 1 or 2, wherein the abnormality detection unit includes an air detection unit that detects the presence or absence of air in the brake system. In the first state, the control device detects the abnormality based on a relationship between an operation amount of the brake operation member and a hydraulic pressure of a brake system including the master cylinder and the first brake cylinder. An abnormality detection unit is included, and the abnormality detection unit switches to the third state and detects the abnormality when the abnormality is not detected by the brake operation abnormality detection unit. The hydraulic brake device according to any one of 1 to 3. The first brake cylinder group includes left and right front wheel brake cylinders, the second brake cylinder group includes left and right rear wheel brake cylinders, and the control device includes the left and right front wheel brake cylinders in the first state. The left and right front wheel brake cylinders are communicated with the master cylinder, and in the second state, the left and right front wheel brake cylinders are disconnected from the master cylinder and communicated with the power hydraulic pressure source, and the left and right rear wheel brake cylinders A hydraulic braking control unit that communicates with the power hydraulic pressure source, in the third state, at least a first brake cylinder that is a brake cylinder of the left and right front wheels, and at least one of the left rear wheel and the right rear wheel Including an abnormality detection control unit that communicates with the second brake cylinder, which is one of the brake cylinders. Hydraulic brake device according to any one of claim 1 to 4. A master cylinder that generates hydraulic pressure in accordance with the operation of the brake operation member by the driver;
A powered hydraulic pressure source that is actuated by power supply and capable of supplying hydraulic fluid;
A plurality of brake cylinders including at least one master communication brake cylinder communicated with the master cylinder or communicated with the power hydraulic source;
A first state in which at least one of the at least one master communication brake cylinder is disconnected from the power hydraulic pressure source and communicated with the master cylinder; and at least one of the at least one master communication brake cylinder is A hydraulic brake device including a control device capable of switching to a second state in which the master cylinder is disconnected and communicated with the power hydraulic pressure source,
A communication device for communicating at least one of all of the master communication brake cylinders and at least one brake cylinder different from at least one of the master communication brake cylinders;
A master hydraulic fluid in which the control device is at least one of at least one master communication brake cylinder that has accumulated the hydraulic fluid supplied from the master cylinder in the first state when the power hydraulic pressure source is in an inoperative state The accumulating brake cylinder is disconnected from the master cylinder, and a fourth state is established in which the communicating device communicates with a working fluid supply target brake cylinder which is at least one brake cylinder other than the at least one master working fluid accumulating brake cylinder. In addition, in the fourth state, the hydraulic brake device includes an abnormality detection unit that detects an abnormality based on a hydraulic pressure of a brake system including the master hydraulic fluid accumulation brake cylinder and the hydraulic fluid supply target brake cylinder. . A master cylinder that generates hydraulic pressure in accordance with the operation of the brake operation member by the driver;
A powered hydraulic pressure source that is actuated by power supply and capable of supplying hydraulic fluid;
A first brake cylinder group including at least one brake cylinder communicated with the master cylinder or communicated with the power hydraulic pressure source;
A second brake cylinder group including at least one brake cylinder different from the brake cylinders included in the first brake cylinder group;
A first state in which at least one of the at least one brake cylinder in the first brake cylinder group is disconnected from the power hydraulic pressure source and communicated with the master cylinder; and at least the first brake cylinder group in the first state. At least one brake cylinder is disconnected from the master cylinder and communicated with the power hydraulic pressure source, and at least one brake cylinder of the second brake cylinder group is connected to the power hydraulic pressure source. A hydraulic brake device including a control device switchable to a second state communicating with
A communication device for communicating at least one of the at least one brake cylinder of the first brake cylinder group with at least one of the at least one brake cylinder of the second brake cylinder group;
The control device causes the first brake cylinder, which is at least one of the at least one brake cylinder of the first brake cylinder group, to communicate with the master cylinder in a non-operating state of the power hydraulic pressure source, and to communicate with the master cylinder. The device sets the first brake cylinder to a fifth state in which the second brake cylinder, which is at least one of the at least one brake cylinder of the second brake cylinder group, communicates with the first brake cylinder. A hydraulic brake device comprising: an abnormality detection unit that detects an abnormality based on a relationship between a hydraulic pressure of a brake system including a cylinder and a second brake cylinder and an operation amount of the brake operation member.

Images