JP5494200B2 - Hydraulic braking system - Google Patents

Description

  The present invention relates to a hydraulic braking system installed in a vehicle.

  In a hydraulic braking system installed in a vehicle, hydraulic fluid that has been pressurized by a high-pressure source device such as a hydraulic pump without depending on the operating force applied to the brake operating member by the driver. There are systems that generate braking force depending on pressure. Some of such systems include a hydraulic pressure adjusting device that regulates the pressure of the hydraulic fluid at a high pressure, as described in the following patent document. In order to generate an appropriate braking force based on the brake operation, the hydraulic braking system including such a hydraulic pressure adjustment device controls the electric power supplied to the hydraulic pressure adjustment device based on the brake operation. Adjust the hydraulic fluid pressure. Also, in such a hydraulic pressure adjusting device, even when the supply of electric power to itself is cut off, the hydraulic pressure generated based on the operating force is used as a pilot pressure to operate itself. Some of them have a function of adjusting the pressure of the hydraulic fluid depending on the pilot pressure, that is, a so-called pilot pressure-dependent pressure adjusting function.

JP 2008-132996 A

  In a hydraulic braking system that employs a hydraulic pressure adjusting device having a pilot pressure-dependent pressure adjusting function, it is desirable to detect an abnormality in the function. Furthermore, since the function is a function that is exhibited when the supply of power to the hydraulic pressure adjusting device is cut off, it does not detect an abnormality only when the function should be performed. It is more desirable to detect the abnormality in a situation where the situation is not exhibited. In view of such a situation, an object of the present invention is to provide a hydraulic braking system having a function of detecting an abnormality of a pilot pressure-dependent pressure regulation function.

  In order to solve the above problems, the hydraulic braking system according to the present invention is dependent on the pilot pressure that adjusts the hydraulic fluid to a pressure according to the hydraulic pressure of the hydraulic fluid of the brake device provided on the wheel as a pilot pressure. Targeting a hydraulic braking system including a hydraulic pressure adjusting device having a pressure regulating function, the hydraulic pressure adjustment is performed in a state in which an abnormality diagnosis unit of a control device included in the system contains the hydraulic fluid having a set pressure in the brake device. The pilot pressure-dependent pressure adjusting function is diagnosed based on the hydraulic pressure (prepared pressure) of the hydraulic fluid adjusted by the hydraulic pressure adjusting device when the supply of power to the device is stopped.

  According to the hydraulic braking system of the present invention, since the abnormality of the pilot pressure dependent pressure adjusting function can be detected even when the power to the hydraulic pressure adjusting device is not cut off, the pilot pressure dependent pressure adjusting function It is possible to improve the practicality of the hydraulic braking system including the hydraulic pressure adjusting device having If the abnormality diagnosis unit is configured to be able to detect an abnormality of the pilot pressure-dependent pressure regulation function at an arbitrary time, a more practical hydraulic braking system is constructed.

Aspects of the Invention

  In the following, some aspects of the invention that can be claimed in the present application (hereinafter sometimes referred to as “claimable invention”) will be exemplified and described. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is merely for the purpose of facilitating the understanding of the claimable inventions, and is not intended to limit the combinations of the constituent elements constituting those inventions to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiments, etc., and as long as the interpretation is followed, another aspect is added to the form of each section. In addition, an aspect in which some constituent elements are deleted from the aspect of each item can be an aspect of the claimable invention.

  In the following items, items (1) to (10) correspond to claims 1 to 10, respectively.

(1) A hydraulic braking system that generates a braking force by the pressure of hydraulic fluid,
An operation member operated by a driver;
A master cylinder device that pressurizes the hydraulic fluid by the operating force applied to the operating member and the pressure of the hydraulic fluid supplied to the operating member;
A brake device that is provided on the wheel and generates a braking force corresponding to the pressure supplied to the wheel; a high-pressure source device that generates high-pressure hydraulic fluid;
The pressure from the high-pressure source device is adjusted according to the electric power supplied to itself, and even in a state where no electric power is supplied to itself, the pressure is adjusted according to the pressure of the hydraulic fluid introduced to itself as a pilot pressure. A hydraulic pressure adjusting device having a pilot pressure dependent pressure regulating function,
A first pressure regulating flow path for supplying the regulated hydraulic fluid from the fluid pressure regulating device to the master cylinder device;
A second pressure regulation channel for communicating the first pressure regulation channel and supplying the hydraulic fluid regulated from the fluid pressure regulation device to the brake device;
A master pressure channel for supplying hydraulic fluid pressurized by the master cylinder device from the master cylinder device to the brake device;
A second pressure regulating flow path breaker provided in the second pressure regulating flow path for blocking the second pressure regulating flow path;
A master pressure flow path breaker provided in the master pressure flow path for blocking the master pressure flow path;
A pilot pressure flow path for introducing the pressure of the hydraulic fluid supplied to the brake device as the pilot pressure into the hydraulic pressure adjusting device;
A control device for controlling the power supplied to the hydraulic pressure adjusting device and the operation of the second pressure regulating flow path breaker and the master pressure flow path breaker;
The control unit is
(a) The hydraulic fluid whose pressure is adjusted according to the electric power by controlling the electric power supplied to the hydraulic pressure adjusting device while cutting off the master pressure channel by the master pressure channel circuit breaker. Realizing a pressure regulation dependent braking force generation state, which is a state of generating a braking force depending on the pressure of the pressure, and (b) shutting off the second pressure regulation channel by the second pressure regulation channel circuit breaker. Even when power supply to the pressure adjusting device is cut off, the pressure of the hydraulic fluid adjusted by the brake device according to the operating force and the pilot pressure by the pressure of the hydraulic fluid from the master cylinder device And an operation control unit that realizes an operation force / pressure regulation dependent braking force generation state that is a state that generates a braking force that depends on both,
An abnormality diagnosing unit that performs diagnosis on abnormality of the hydraulic braking system,
The abnormality diagnosis part
In the state in which the master pressure channel and the second pressure regulation channel are respectively blocked by the master pressure channel circuit breaker and the second pressure regulation channel circuit breaker, and the hydraulic fluid of the first set pressure is contained in the brake device, Abnormality in the pilot pressure-dependent pressure adjusting function of the hydraulic pressure adjusting device based on the pressure of the hydraulic fluid adjusted by the hydraulic pressure adjusting device when the supply of power to the hydraulic pressure adjusting device is stopped A hydraulic braking system having a pilot pressure-dependent pressure regulation function diagnostic unit for diagnosing the pressure.

  The control device included in the hydraulic braking system described in this section includes an abnormality diagnosis unit, and the abnormality diagnosis unit diagnoses the pilot pressure-dependent pressure adjustment function of the hydraulic pressure adjustment device. Has a diagnostic department. Diagnosis by the diagnosis unit actively prohibits the supply of power to the hydraulic pressure adjusting device in a state where the hydraulic fluid is contained in the brake device by the master pressure channel breaker and the second pressure regulating channel breaker. Done. That is, even when the power to the hydraulic pressure adjusting device cannot be supplied, the function can be diagnosed by demonstrating the above function. Therefore, the system of this section is a highly practical system because it can detect an abnormality in the pilot pressure-dependent pressure regulation function even in a situation where it is necessary to exhibit the function.

  Specifically, in the diagnosis by the pilot pressure dependent pressure adjusting function diagnosis unit, the supply of power to the hydraulic pressure adjusting device is stopped in a state where the hydraulic fluid of the set pressure is contained in the brake device, The function is diagnosed based on the pressure adjusted by the hydraulic pressure adjusting device. According to such a diagnosis, when the supply of power is stopped, the second pressure regulating flow path is shut off, so that the regulated hydraulic fluid is supplied from the hydraulic pressure adjusting device to the brake device. If there is no abnormality in the function, the pressure adjusted by the hydraulic pressure adjusting device (hereinafter sometimes referred to as “adjusted pressure”) is a pressure corresponding to the set pressure (hereinafter referred to as “adjusted pressure”). Sometimes referred to as “normal reference pressure”). On the other hand, when there is an abnormality in the function, the adjustment pressure does not become the normal reference pressure. The pilot pressure-dependent pressure regulation function diagnosing unit uses such a phenomenon to diagnose an abnormality in the pilot pressure-dependent pressure regulation function.

  As described above, since the diagnosis of the pilot pressure-dependent pressure regulation function is performed, the diagnosis can be performed without depending on the driver's operation of the brake operation member. This contributes to increasing the degree of freedom in the timing of the diagnosis. In short, as long as various conditions are satisfied, the operating state of the hydraulic pressure adjusting device can be changed to an operating state based on the pilot pressure-dependent pressure adjusting function at any time, such as when the vehicle is started, stopped, or running. Therefore, it is possible to diagnose the function at any time. For example, when starting or stopping the vehicle, as will be described later, the pilot pressure-dependent pressure adjustment function diagnosis unit actively makes a diagnosis by making the brake device contain the set pressure hydraulic fluid. It can be carried out. Further, for example, during running, during braking, the second pressure regulating flow path is shut off for a very short time to contain the working fluid in the brake device, and the pressure of the contained working fluid is set to the set pressure. By simulating and stopping the supply of power to the hydraulic pressure adjusting device for a very short time, the above function can be diagnosed. According to such a method, diagnosis can be executed without substantially impairing the required braking force.

(2) The pilot pressure-dependent pressure regulation function diagnosis unit
By supplying electric power to the hydraulic pressure adjusting device in a state where the master pressure flow channel is interrupted by the master pressure flow circuit breaker, the hydraulic fluid having the first set pressure is supplied to the brake device via the second pressure regulating flow channel. (1), wherein the second pressure regulating flow path breaker is used to shut off the second pressure regulating flow path and contain the hydraulic fluid having the first set pressure in the brake device. The hydraulic braking system described.

  The aspect of this section is an aspect in which a limitation relating to the method of containing hydraulic fluid in the brake device described above is added. More specifically, the pilot pressure-dependent pressure regulation function diagnosis unit is a mode in which a state in which the hydraulic fluid of the set pressure is contained in the brake device is positively realized at the time of diagnosis, such as when the vehicle is started, when the vehicle is stopped, etc. This is particularly effective when executing the above function diagnosis. By the way, according to the aspect of this section, even when the operating member is operated by the driver, the hydraulic fluid of the set pressure can be contained in the brake device, so that the influence of the hydraulic fluid supplied from the master cylinder device is reduced. It is possible to execute the diagnosis without receiving it.

(3) The pilot pressure-dependent pressure adjusting function of the hydraulic pressure adjusting device is a function of adjusting the pressure of the hydraulic fluid from the high pressure source device to a pressure that is a set ratio with respect to the pilot pressure,
The pilot pressure-dependent pressure regulation function diagnostic unit is
When the supply of electric power to the hydraulic pressure adjusting device is prohibited, the pressure of the hydraulic fluid adjusted by the hydraulic pressure adjusting device is set to a pressure set to be equal to or lower than the pressure that is the set ratio with respect to the first set pressure. If not, the hydraulic braking system according to (1) or (2) is configured to diagnose that the pilot pressure-dependent pressure regulation function is abnormal.

  The mode of this section is a mode in which a limitation is added to the abnormality determination criteria by the pilot pressure-dependent pressure regulation function diagnostic unit. According to the hydraulic pressure adjustment device described in this section, as described above, when the pilot pressure-dependent pressure adjustment function is normal, the adjustment force is set to a set ratio with respect to the pilot pressure set as the first set pressure. Pressure, that is, a normal reference pressure. On the other hand, when it is abnormal, the adjustment pressure does not become the normal reference pressure. The pilot pressure dependent pressure regulation function diagnosis unit in this section determines whether or not there is an abnormality based on the reference pressure at normal time or based on the pressure set with a certain margin in the reference pressure. .

  (4) Item (1) to Item (3), wherein the abnormality diagnosing unit includes a second pressure regulation channel interruption abnormality diagnosing unit that diagnoses an abnormality in the second pressure regulation channel interruption by the second pressure regulation circuit breaker. The hydraulic braking system according to any one of the above.

  According to the aspect described in this section, in addition to the diagnosis about the pilot pressure dependent pressure regulating function described above, the second pressure regulating flow path breakage abnormality, specifically, the second pressure regulating flow path breaker abnormality Since diagnosis can also be performed, a more practical hydraulic braking system can be constructed. Further, as will be described later, when the second pressure regulation flow path is abnormally shut off, it may be determined that the function is abnormal in the diagnosis of the pilot pressure dependent pressure regulation function described above. It is possible to improve the reliability of the diagnosis for the function by performing the diagnosis for the pilot pressure-dependent pressure adjustment function based on the diagnosis result for the abnormality in blocking the second pressure adjustment flow path.

(5) The second pressure regulation flow path interruption abnormality diagnosis unit
The configuration according to (4), wherein the master pressure flow path breaker is configured to diagnose a blockage abnormality of the second pressure regulation flow path by the second pressure regulation flow path breaker in a state where the master pressure flow path breaker is blocked. Hydraulic braking system.

  The mode of this section is a mode in which a limitation relating to a specific diagnosis method for the abnormal shutoff of the second pressure regulation flow path is added. According to the aspect of this section, since the master pressure channel is blocked, a diagnosis that is not affected by the pressurized hydraulic fluid supplied from the master cylinder device is possible. In other words, it is possible to detect a malfunction of the second pressure regulating circuit breaker without depending on the operation of the operating member by the driver.

(6) The low pressure source flow path for guiding the hydraulic fluid of the brake device to the low pressure source, and the low pressure source flow channel for cutting off the low pressure source flow channel when the hydraulic fluid is supplied to the brake device. With a circuit breaker,
The second pressure regulation flow path cutoff abnormality diagnosis unit is
Supplying a hydraulic fluid having a second set pressure to the second pressure regulating channel by supplying electric power to the hydraulic pressure adjusting device in a state in which the second pressure regulating channel is interrupted by the second pressure regulating channel circuit breaker; Thereafter, the blocking of the low pressure source flow path by the low pressure source flow path breaker is released, and the second pressure regulating flow path is based on the actual pressure of the hydraulic fluid supplied to the second pressure regulating flow path at that time. The hydraulic braking system according to item (5), which is configured to diagnose an abnormal shutoff of the second pressure regulation flow path by a circuit breaker.

  The mode of this section is a mode in which a further limitation is added to the diagnostic method for the abnormal shutoff of the second pressure regulation flow path. When the hydraulic pressure is adjusted to the second set pressure by the hydraulic pressure adjustment device in a state where the second pressure adjustment flow path is cut off, the brake device is set to the second set pressure when the second pressure adjustment flow path breaker is normal. The hydraulic fluid is not supplied. On the other hand, when liquid leakage or the like occurs in the second pressure regulation flow path breaker, the hydraulic fluid having the second set pressure is supplied to the brake device. When the adjusted pressure is set to the second set pressure in a state where the second pressure regulating flow path breaker is blocked by the second pressure regulating flow path breaker, and then the low pressure source flow path is opened, the second pressure regulating flow path breaker is normal. When it is, the pressure of the hydraulic fluid supplied to the second pressure regulation flow path does not change. On the other hand, when the second pressure regulation flow circuit breaker has the above-described problem, the hydraulic fluid between the circuit breaker and the fluid pressure adjusting device flows out to the low pressure source through the circuit breaker. As a result, the pressure of the hydraulic fluid supplied to the second pressure regulation flow path is reduced. Diagnosis of the blockage abnormality of the second pressure regulation flow path according to the aspect of this section is performed using such a phenomenon. In addition, it is desirable that the diagnosis about the abnormal shutoff of the second pressure regulation flow path is performed when the vehicle is started and when the vehicle is stopped.

(7) The second pressure regulation flow path interruption abnormality diagnosis unit is
The actual pressure of the hydraulic fluid supplied to the second pressure regulation flow path when the low pressure source flow path breaker is released from being shut off by the low pressure source flow path breaker is lower than the pressure set to the second set pressure or lower. In this case, the hydraulic braking system according to the item (6), which is configured to diagnose that the interruption of the second pressure regulation flow path by the second pressure regulation flow path breaker is abnormal.

  The mode of this section is a mode in which a limitation relating to the determination criterion of the block abnormality by the second pressure regulation flow path block abnormality diagnosis unit is added. As described above, when a malfunction such as liquid leakage occurs in the second pressure regulating flow path breaker, the pressure of the hydraulic fluid supplied to the second pressure regulating flow path is decreased from the second set pressure. To change. In the aspect of this section, the pressure of the hydraulic fluid supplied to the second pressure regulation flow path is lower than the reference pressure with the second set pressure or a pressure having a certain margin as compared to the set pressure as the reference pressure. If this happens, it will be determined that there is an abnormal shutdown. The state of the hydraulic pressure drop in the case of a shutoff abnormality varies depending on the degree of leakage, that is, the degree of failure, the difference between the second set pressure and the pressure of the low pressure source, etc. Should be set appropriately.

  In addition, when the hydraulic pressure adjusting device has a structure in which the hydraulic fluid does not flow back to the low pressure source, the hydraulic fluid set to the second set pressure does not flow out from the hydraulic pressure adjusting device to the low pressure source. Can be done. On the other hand, when the hydraulic pressure adjusting device is configured to allow the back flow, it is sufficient to continue supplying power to the hydraulic pressure adjusting device so as to maintain the second set pressure. What is necessary is just to judge whether it is abnormal | blocking abnormality with the fall of the adjustment pressure in the time when only the very short time has passed after canceling | releasing the interruption | blocking of a low pressure source flow path.

(8) The second pressure regulation flow path interruption abnormality diagnosis unit
By supplying electric power to the hydraulic pressure adjusting device, the hydraulic fluid having the second set pressure is supplied to the brake device via the second pressure adjusting flow path, and then the second pressure adjusting flow path breaker is used to supply the second hydraulic pressure. The electric power supplied to the hydraulic pressure adjusting device is increased so as to block the pressure adjusting flow path and increase the pressure of the hydraulic fluid to a third set pressure higher than the second set pressure, and the second pressure adjusting flow path at that time is increased. The hydraulic braking according to (5), wherein the second pressure regulating flow path breaker is configured to diagnose a blocking abnormality of the second pressure regulating flow path based on an actual pressure of the supplied hydraulic fluid. system.

  The aspect of this section is an aspect in which a limitation different from the limitation described above is added to the diagnostic technique for the abnormality in blocking the second pressure regulation flow path. Consider a case in which hydraulic fluid having a higher third set pressure is supplied by the hydraulic pressure adjusting device in a state where the hydraulic fluid having the second set pressure is sealed in the brake device by the second pressure regulating flow path breaker. In that case, when the second pressure regulating flow path breaker is normal, the brake device is not supplied with the hydraulic fluid at the high pressure, and the pressure of the hydraulic fluid supplied by the hydraulic pressure adjusting device is the high pressure. Maintained. On the other hand, when liquid leakage or the like occurs in the second pressure regulation flow breaker, the hydraulic fluid is supplied to the brake device, and the pressure of the hydraulic fluid supplied by the hydraulic pressure adjusting device decreases. Diagnosis of the blockage abnormality of the second pressure regulation flow path according to the aspect of this section is performed using such a phenomenon. In addition, it is desirable that the diagnosis about the abnormal shutoff of the second pressure regulation flow path is performed when the vehicle is started and when the vehicle is stopped.

(9) The second pressure regulation flow path interruption abnormality diagnosis unit is
When the actual pressure of the hydraulic fluid supplied to the second pressure regulation flow path does not reach the pressure set to the third set pressure or less when the power supplied to the hydraulic pressure adjusting device is increased. The hydraulic braking system according to item (8), wherein the second pressure regulating flow path breaker is configured to diagnose that the interruption of the second pressure regulating flow path is abnormal.

  The mode of this section is a mode in which a limitation relating to the determination criterion of the block abnormality by the second pressure regulation flow path block abnormality diagnosis unit is added. As described above, when a malfunction such as liquid leakage occurs in the second pressure regulating flow path breaker, the pressure of the hydraulic fluid supplied to the second pressure regulating flow path is decreased from the third set pressure. To change. In the aspect of this section, the pressure of the hydraulic fluid supplied to the second pressure regulation flow path is lower than the reference pressure with the third set pressure or a pressure having a certain margin as compared to the set pressure as the reference pressure. If this happens, it will be determined that there is an abnormal shutdown. The state of the hydraulic pressure drop in the case of an abnormal shutoff varies depending on the degree of leakage, that is, the degree of malfunction, the difference between the third set pressure and the second set pressure, etc. Should be set appropriately.

  In addition, when the hydraulic pressure adjusting device has a structure in which the hydraulic fluid does not flow back to the low pressure source, the hydraulic fluid set to the third set pressure does not flow out from the hydraulic pressure adjusting device to the low pressure source, so that accurate diagnosis can be performed. Can be done. On the other hand, when the hydraulic pressure adjusting device is configured to allow the backflow when the supply of power is stopped, it is possible to continue supplying power to the hydraulic pressure adjusting device so as to maintain the third set pressure. In such a case, the hydraulic pressure and the reference pressure of the hydraulic fluid supplied to the second pressure regulation flow path may be reduced at the time when only a very short time has elapsed after the start of the pressure increase to the third set pressure. In comparison, it may be determined whether or not there is a blocking abnormality.

(10) The pilot pressure-dependent pressure regulation function diagnostic unit
The pilot pressure-dependent pressure regulation function is abnormal on the condition that the second pressure regulation flow path interruption abnormality diagnosis unit diagnoses that the second pressure regulation flow path breaker is not abnormally blocked by the second pressure regulation flow path breaker. The hydraulic braking system according to any one of (4) to (9), configured to diagnose that

  As described above, when there is an abnormality such as leakage in the second pressure regulating flow path breaker, even if the second pressure regulating flow path is blocked by the breaker, the hydraulic fluid passes through the breaker to the brake device. Flows out. Therefore, when a diagnosis is performed on the pilot pressure-dependent pressure regulation function when there is an abnormality in the second pressure regulation flow circuit breaker, the pilot pressure changes due to the abnormality, and an accurate diagnosis can be performed for the function. Disappear. In view of this, the aspect of this section is an aspect in which an abnormality of the pilot pressure-dependent pressure adjustment function is recognized on the condition that there is no abnormality in blocking the second pressure adjustment flow path.

It is a schematic diagram showing the drive system and braking system of a hybrid vehicle equipped with the hydraulic braking system of the first embodiment. It is a figure which shows the hydraulic braking system of 1st Example. It is a figure which shows the hydraulic pressure adjustment apparatus and high pressure source device of the hydraulic braking system of 1st Example. Brake actuator configured to include a high pressure source device, a hydraulic pressure adjusting device, a first pressure regulating channel, a second pressure regulating channel, a second pressure regulating channel circuit breaker, and a pilot pressure channel of the hydraulic braking system of the first embodiment It is a figure which shows the external appearance. It is a flowchart of the abnormality diagnosis process which the hydraulic braking system of 1st Example performs. In the hydraulic braking system of the 1st example, it is a table for specifying the cause of abnormality from the result of abnormality diagnosis. It is a table | surface which shows the relationship between the cause of abnormality in the hydraulic braking system of 1st Example, and the mode which operates a hydraulic braking system according to the cause. It is a flowchart of the process which diagnoses the leak of the hydraulic fluid in the hydraulic braking system of 1st Example. It is a flowchart of the process which the pilot pressure dependence pressure regulation function diagnostic part of the hydraulic braking system of 1st Example performs. It is a flowchart of the process which the 2nd pressure regulation flow path interruption | blocking abnormality diagnostic part of the hydraulic braking system of 1st Example performs. It is a flowchart of the process which the 2nd pressure regulation flow path interruption | blocking abnormality diagnostic part of the hydraulic-pressure braking system of a modification performs. It is a figure which shows the hydraulic pressure adjustment apparatus and high pressure source device of the hydraulic braking system of 2nd Example. It is a figure which shows the hydraulic pressure adjustment apparatus and high pressure source device of the hydraulic braking system of 3rd Example.

  Hereinafter, embodiments of the claimable invention will be described in detail with reference to the drawings. The claimable invention is not limited to the following examples and modifications, and can be implemented in various modes with various changes and improvements based on the knowledge of those skilled in the art.

≪Vehicle configuration≫
FIG. 1 schematically shows a drive system and a braking system for a hybrid vehicle equipped with the hydraulic braking system of the first embodiment. In the vehicle, an engine 10 and an electric motor 12 are mounted as power sources, and a generator 14 that generates electric power by the output of the engine 10 is also mounted. These engine 10, electric motor 12, and generator 14 are connected to each other by a power split mechanism 16. By controlling the power split mechanism 16, the output of the engine 10 is divided into an output for operating the generator 14 and an output for rotating one of the four wheels 18 as a driving wheel, The output from the electric motor 12 can be transmitted to the drive wheels. That is, the power split mechanism 16 functions as a transmission related to the driving force transmitted to the drive wheels via the speed reducer 20 and the drive shaft 22. It should be noted that some components such as “wheel 18” are used as a general term, but when indicating that they correspond to any of the four wheels, the left front wheel, the right front wheel, the left rear wheel, The subscripts “FL”, “FR”, “RL”, and “RR” are assigned to the right rear wheel, respectively. According to this notation, the driving wheels in the vehicle are the wheel 18RL and the wheel 18RR.

  The electric motor 12 is an AC synchronous motor and is driven by AC power. The vehicle is provided with an inverter 24, and the inverter 24 can convert electric power from direct current to alternating current or from alternating current to direct current. Therefore, by controlling the inverter 24, the AC power output from the generator 14 is converted into the DC power for storing in the battery 26, or the DC power stored in the battery 26 is converted into the electric motor. 12 can be converted into AC power for driving the motor 12. Like the electric motor 12, the generator 14 has a configuration as an AC synchronous motor. That is, in the vehicle of the present embodiment, it can be considered that two AC synchronous motors are mounted, and one is used mainly as an electric motor 12 for outputting driving force, and the other is a generator. 14 is mainly used for power generation by the output of the engine 10.

  The electric motor 12 can also generate power (regenerative power generation) by using the rotation of the wheels 18RL and 18RR as the vehicle travels. At this time, in the electric motor 12 connected to the wheels 18RL and 18RR, electric power is generated and a resistance force for stopping the rotation of the electric motor 12 is generated. Therefore, the resistance force can be used as a braking force for braking the vehicle. That is, the electric motor 12 is used as a regenerative brake means for braking the vehicle while generating electric power. Therefore, the vehicle is braked when the regenerative brake is controlled together with the engine brake and a hydraulic brake described later.

  In the present vehicle, the above-described brake control and various types of control relating to other vehicles are performed by a plurality of electronic control units (ECUs). Of the plurality of ECUs, the main ECU 40 has a function of supervising these controls. For example, the hybrid vehicle can run by driving the engine 10 and the electric motor 12. The driving of the engine 10 and the driving of the electric motor 12 are comprehensively controlled by the main ECU 40. The Specifically, the distribution of the output of the engine 10 and the output of the electric motor 12 is determined by the main ECU 40, and the engine ECU 42 that controls the engine 10, the electric motor 12, and the motor that controls the generator 14 based on the distribution. Commands for each control are output to the ECU 44. A battery ECU 46 that controls the battery 26 is also connected to the main ECU 40.

  Further, a brake ECU 48 that controls the brake is also connected to the main ECU 40. The vehicle is provided with a brake operation member (hereinafter sometimes simply referred to as an “operation member”) that is operated by the driver, and the brake ECU 48 has a brake operation amount (hereinafter referred to as an operation amount of the operation member). May be simply referred to as an “operation amount”) and a brake control force that is a driver's force applied to the operation member (hereinafter, also referred to simply as “operation force”). The power is determined and this target braking force is output to the main ECU 40. The main ECU 40 outputs this target braking force to the motor ECU 44, and the motor ECU 44 controls the regenerative braking based on the target braking force, and the execution value thereof, that is, the generated regenerative braking force is supplied to the main ECU 40. Output to. In the main ECU 40, the regenerative braking force is subtracted from the target braking force, and the target hydraulic braking force to be generated in the hydraulic braking system 100 mounted on the vehicle is determined by the subtracted value. The main ECU 40 outputs the target hydraulic braking force to the brake ECU 48, and the brake ECU 48 performs control so that the hydraulic braking force generated by the hydraulic braking system 100 becomes the target hydraulic braking force in a normal state.

≪Configuration of hydraulic braking system≫
The hydraulic braking system 100 mounted on the hybrid vehicle configured as described above will be described in detail with reference to FIG. In the following description, “front” represents the left side in FIG. 2, and “rear” represents the right side in FIG. In addition, “front side”, “rear side”, “front end”, “rear end”, “forward”, “reverse”, and the like are also represented in the same manner. In the following description, the character [] is a symbol used when a sensor or the like is shown in the drawings.

  FIG. 2 schematically shows a hydraulic braking system 100 provided in the vehicle. The hydraulic braking system 100 has a master cylinder device 110 for pressurizing hydraulic fluid. The driver of the vehicle can operate the master cylinder device 110 by operating the operation device 112 connected to the master cylinder device 110, and the master cylinder device 110 pressurizes the hydraulic fluid by its own operation. The pressurized hydraulic fluid is supplied to a brake device 116 provided on each wheel via an antilock device 114 connected to the master cylinder device 110. The brake device 116 generates a force for stopping the rotation of the wheel 18, that is, a hydraulic braking force, depending on the pressure of the hydraulic fluid supplied to the brake device 116 (hereinafter referred to as “brake pressure”).

  The hydraulic braking system 100 includes a high pressure source device 118 that generates high pressure hydraulic fluid. The high pressure source device 118 is connected to the master cylinder device 110 via the hydraulic pressure adjusting device 120. As will be described in detail later, the hydraulic pressure adjusting device 120 adjusts the pressure of the hydraulic fluid controlled by the brake ECU 48 and set to a high pressure by the high pressure source device 118 (hereinafter sometimes referred to as “high pressure source pressure”). Is possible. The hydraulic fluid of the adjusted pressure (hereinafter sometimes referred to as “adjusted pressure”) is supplied to the master cylinder device 110 and the brake device 116. Further, the hydraulic braking system 100 has a reservoir 122 that stores hydraulic fluid under atmospheric pressure. The reservoir 122 is connected to each of the master cylinder device 110, the fluid pressure adjustment device 120, and the high pressure source device 118.

  The operation device 112 includes a brake pedal 140 as an operation member, and an operation rod 142 connected to the brake pedal 140. The brake pedal 140 is rotatably held on the vehicle body. The operation rod 142 is connected to the brake pedal 140 at the rear end, and is connected to the master cylinder device 110 at the front end. The operation device 112 includes an operation amount sensor [SP] 144 for detecting an operation amount of the brake pedal 140 and an operation force sensor [FP] 146 for detecting an operation force. The operation amount sensor 144 and the operation force sensor 146 are connected to the brake ECU 48, and the brake ECU 48 determines a target braking force based on detection values of these sensors.

  Although detailed description is omitted, the brake device 116 includes a brake caliper, a wheel cylinder (brake cylinder) and a brake pad attached to the brake caliper, and a brake disk that rotates with each wheel. The brake cylinder relies on the pressure of the hydraulic fluid to press the brake pad against the brake disc. Due to the friction generated by the pressing, each brake device 116 generates a hydraulic braking force that stops the rotation of the wheel, and the vehicle is braked.

  The anti-lock device 114 is a general device, and simply has four pairs of on-off valves corresponding to each wheel. One of each pair of on-off valves is a pressure-increasing on-off valve 170, and is open when the wheel is not locked, and the other is a pressure-reducing on-off valve 172. When the wheel is not locked, the valve is closed. When the wheels are locked, the pressure increasing on / off valve 170 is closed and the pressure reducing on / off valve 172 is opened, allowing the flow of hydraulic fluid from the brake device 116 to the reservoir 122 as a low pressure source. Configured to unlock the wheels.

  The high-pressure source device 118 is provided in the liquid passage from the liquid pressure adjusting device 120 to the reservoir 122. The high-pressure source device 118 includes a hydraulic pump 180 that increases the pressure of the hydraulic fluid, and an accumulator 182 in which the increased hydraulic fluid is stored. Incidentally, the hydraulic pump 180 is driven by a motor 184.

<Configuration of master cylinder device>
The master cylinder device 110 includes a housing 200 that is a housing of the master cylinder device 110, a first pressurizing piston 202 and a second pressurizing piston 204 that pressurize the hydraulic fluid supplied to the brake device 116, and the operating force and hydraulic pressure of the driver. It includes an intermediate piston 206 that moves forward with hydraulic fluid adjusted pressure supplied from the adjusting device 120, and an input piston 208 in which the operation of the driver is input through the operating device 112. FIG. 2 shows a state where the master cylinder device 110 is not operating, that is, a state where the brake operation is not performed. By the way, as is the case with general cylinder devices, this master cylinder device 110 is also connected to several liquid chambers in which hydraulic fluid is stored, between these liquid chambers, and between these liquid chambers and the outside. Several communication passages are formed, and several seals are disposed between the components in order to ensure their liquid tightness. These seals are general, and in consideration of the simplification of the description of the specification, the description thereof will be omitted unless particularly described.

  The housing 200 is mainly composed of two members, specifically, a first housing member 220 and a second housing member 222. The first housing member 220 has a generally cylindrical shape whose front end is closed, and a flange 224 is formed on the outer periphery of the rear end, and is fixed to the vehicle body at the flange 224. The first housing member 220 has three portions having different inner diameters, specifically, a front small diameter portion 226 having the smallest inner diameter located on the front side, and a rear large diameter portion 228 having the largest inner diameter located on the rear side. The intermediate portion 230 is located between the front small-diameter portion 226 and the rear large-diameter portion 228 and has an intermediate inner diameter.

  The second housing member 222 has a cylindrical shape having a front large diameter portion 232 having a large outer diameter located on the front side and a rear small diameter portion 234 having a small outer diameter located on the rear side. The second housing member 222 is fitted into the rear large-diameter portion 228 so that the front end portion of the front large-diameter portion 232 is in contact with the step surface between the intermediate portion 230 and the rear large-diameter portion 228 of the first housing member 220. Yes. The first housing member 220 and the second housing member 222 are fastened to each other by a lock ring 236 fitted on the inner peripheral surface of the rear end portion of the first housing member 220.

  Each of the first pressure piston 202 and the second pressure piston 204 has a bottomed cylindrical shape with a closed rear end, and is slidably fitted to the front small-diameter portion 226 of the first housing member 220. Are combined. The first pressure piston 202 is disposed behind the second pressure piston 204. A first pressurizing chamber R1 for pressurizing the hydraulic fluid supplied to the brake device 116FL for the left front wheel is defined between the first pressurizing piston 202 and the second pressurizing piston 204, and In front of the second pressurizing piston 204, a second pressurizing chamber R2 for pressurizing the hydraulic fluid supplied to the brake device 116FR provided on the right front wheel is defined. The first pressure piston 202 and the second pressure piston 204 are fixed to the headed pin 250 erected at the rear end portion of the first pressure piston 202 and the rear end surface of the second pressure piston 204. The separation distance is limited within the set range by the pin holding cylinder 252 provided. Further, in the first pressurizing chamber R1 and the second pressurizing chamber R2, compression coil springs (hereinafter sometimes referred to as “return springs”) 254 and 256 are disposed, respectively. 256, the first pressurizing piston 202 and the second pressurizing piston 204 are urged in a direction away from each other, and the first pressurizing piston 202 and the second pressurizing piston 204 are applied rearward. The first pressurizing piston 202 is in contact with a front end surface of an intermediate piston 206 described later.

  The intermediate piston 206 includes a cylindrical main body portion 270 having both ends opened and a lid portion 272 that closes the front end portion of the main body portion 270. The intermediate piston 206 is slidably fitted to the inner peripheral surface of the intermediate portion 230 of the first housing member 220 with the front end in contact with the rear end of the first pressure piston 202. A liquid chamber (hereinafter referred to as “supply liquid chamber”) to which hydraulic fluid adjusted by the hydraulic pressure adjusting device 120 is supplied to the rear of the intermediate piston 206 and between the front end portion of the second housing member 222. R3 is partitioned. Incidentally, in FIG. 2, it is shown in the almost collapsed state. In addition, a space formed between the inner peripheral surface of the first housing member 220 and the outer peripheral surface of the first pressure piston 202 exists inside the housing 200. The space is partitioned by the front end surface of the intermediate piston 206 and the step surface between the front small-diameter portion 226 and the intermediate portion 230 of the first housing member 220, so that an annular liquid chamber (hereinafter referred to as atmospheric pressure) that is always at atmospheric pressure. , Sometimes referred to as “atmospheric pressure chamber”).

  The input piston 208 is mainly configured by an outer cylindrical member 280 having a cylindrical shape whose front end is closed and opened at a rear end portion, and a generally cylindrical rod member 282. In the input piston 208, a rod member 282 is inserted into the outer cylinder member 280 from the rear end side thereof. The input piston 208 is inserted from the front end portion of the main body 270 of the intermediate piston 206 while being held by the second housing member 222, and can be advanced and retracted with respect to the intermediate piston 206. Inside the input piston 208 and the intermediate piston 206 configured as described above, a liquid chamber whose volume changes due to the relative movement of the intermediate piston 206 and the input piston 208 (hereinafter sometimes referred to as “internal chamber”). R5 is partitioned. Incidentally, the backward movement of the input piston 208 is restricted by the flange portion formed at the front end portion of the outer cylinder member 280 coming into contact with the rear end portion of the main body portion 270 of the intermediate piston 206.

  In the inner chamber R5, a first reaction force spring 290 and a second reaction force spring 292, which are two compression coil springs, are disposed between the inner bottom surface of the intermediate piston 206 and the front end surface of the input piston 208. . The first reaction force spring 290 is disposed in series behind the second reaction force spring 292, and a rod-shaped floating seat 294 with a hook is sandwiched and supported by the reaction force springs. The first reaction force spring 290 has a front end portion supported by the front end portion of the intermediate piston 206 and a rear end portion supported by the front seat surface of the floating seat 294. On the other hand, the front end portion of the second reaction force spring 292 is supported by the seat surface on the rear side of the floating seat 294, and the rear end portion is supported by the front end portion of the input piston 208. The first reaction force spring 290 and the second reaction force spring 292 arranged in this way cause the input piston 208 and the intermediate piston 206 to move away from each other, that is, the volume of the internal chamber R5 is increased. Energized in the direction. Further, a first buffer rubber 296 is fitted into the front end portion of the floating seat 294, and a second buffer rubber 298 is fitted into the rear end portion, and the first buffer rubber 296 contacts the inner bottom surface of the intermediate piston 206, When the second buffer rubber 298 abuts against the front end surface of the input piston 208, the approach between the floating seat 294 and the intermediate piston 206 and the approach between the floating seat 294 and the input piston 208 are limited to a certain range. .

  The operating force applied to the brake pedal 140 is transmitted to the input piston 208 at the rear end portion of the rod member 282 of the input piston 208, and the input piston 208 is advanced or retracted according to the operation amount of the brake pedal 140. The front end of the operation rod 142 is connected. Incidentally, the input piston 208 is restricted from retreating because the rear end portion of the rod member 282 is locked by the rear end portion of the second housing member 222. In addition, a circular support plate 300 is attached to the operation rod 142, and a boot 302 is passed between the support plate 300 and the housing 200 so that the dust at the rear portion of the master cylinder device 110 is protected. ing.

  The first pressurizing chamber R1 communicates with the outside through a communication hole 310 whose opening serves as an output port, and the communication hole 312 provided in the first pressure piston 202 and a communication whose opening serves as a drain port. It communicates with the reservoir 122 through the hole 314 in a state where it is allowed to be out of communication. On the other hand, the second pressurizing chamber R2 communicates with the outside through a communication hole 316 whose opening serves as an output port, and the communication hole 318 provided in the second pressurizing piston 204 and a communication whose opening serves as a drain port. The hole 320 communicates with the reservoir 122 in a state where it is allowed to be disconnected.

  The intermediate piston 206 has an outer diameter that is somewhat smaller than the inner diameter of the intermediate portion 230 of the first housing member 220, and a liquid passage 322 having a certain flow path area is formed between them. The supply liquid chamber R3 can communicate with the outside through a communication hole 324 whose liquid passage 322 and opening serve as a connection port.

  The intermediate piston 206 is provided with a communication hole 330 in the lid portion 272 for communicating the atmospheric pressure chamber R4 and the internal chamber R5. The first pressurizing piston 202 has an outer diameter that is somewhat smaller than the inner diameter of the intermediate portion 230 of the first housing member 220, and a liquid passage 332 having a certain flow passage area is formed between them. Yes. The atmospheric pressure chamber R4 is in communication with the reservoir 122 through the liquid passage 332 and the communication hole 314. Accordingly, the annular chamber R4 and the inner chamber R5 are always at atmospheric pressure, and their hydraulic fluid can flow into and out of the reservoir 122.

≪Configuration of hydraulic pressure adjustment device≫
FIG. 3 is a schematic diagram showing the hydraulic pressure adjusting device 120 and the high pressure source device 118. The hydraulic pressure adjusting device 120 corresponds to an electromagnetic pressure increasing linear valve 370 that increases the adjusting pressure, an electromagnetic pressure reducing linear valve 372 that decreases the adjusting pressure, and the pressure of the working fluid introduced as a pilot pressure therein. And a pressure regulating valve device 374 that regulates the hydraulic fluid to a regulated pressure.

  The pressure-increasing linear valve 370 is in a closed state in a state where power is not supplied, that is, in a non-excited state, and is supplied by supplying power, that is, in an excited state. The valve opens at the valve opening pressure corresponding to the electric power. Incidentally, the valve opening pressure is reduced as the supplied electric power is increased. On the other hand, the pressure-reducing linear valve 372 is opened when power is not supplied, and is closed when the maximum current in the range set in itself is supplied. Incidentally, the valve opening pressure is increased as the supplied electric power is smaller.

  The pressure regulating valve device 374 includes a housing 380 that is a housing of the pressure regulating valve device 374, a pressure reducing valve member 382 that operates when the adjustment pressure is reduced, a pressure increasing valve member 384 that is operated when the adjustment pressure is increased, and the pressure increasing valve. And a pressing member 386 that presses and operates the member 384. FIG. 3 shows a state where the pressure regulating valve device 374 is not operating. Similar to the master cylinder device 110, the pressure regulating valve device 374 has several fluid chambers in which the working fluid is stored, some fluid chambers between the fluid chambers, and some fluid communication between the fluid chambers and the outside. A passage is formed, and several seals are disposed between the constituent members in order to ensure their liquid tightness. These seals are general, and in consideration of the simplification of the description of the specification, the description thereof will be omitted unless particularly described.

  The housing 380 is mainly composed of three members, specifically, a first housing member 390 having a cylindrical shape whose upper end in FIG. 3 is open, and a cylindrical shape that is fitted into the opening of the first housing member 390. The second housing member 392 and a third housing member 394 that closes the upper end portion of the second housing member. The first housing member 390 has three portions having different inner diameters, specifically, a lower small diameter portion 396 having the smallest inner diameter located below, an upper large diameter portion 398 having the largest inner diameter located above, It is located in the middle of the lower small diameter portion 396 and the upper large diameter portion 398, and is divided into an intermediate portion 400 having an inner diameter that is intermediate between those inner diameters.

  A pressure reducing valve member 382 is slidably fitted to the lower small diameter portion 396 through a seal. The pressure reducing valve member 382 has a generally cylindrical shape, the upper end portion of which is formed into a hemispherical valve body portion 402, and the lower end surface of which is provided with a recess, and a pilot pressure acting portion on which a pilot pressure described later acts. 404. Further, the outer diameter of the valve body portion 402 is made smaller than the outer diameter of the pilot pressure acting portion 404, and a step surface formed by the different outer diameters is formed in the middle of the pressure reducing valve member 382. Is formed.

  A pressing member 386 is slidably fitted to the intermediate portion 400 through a seal. The pressing member 386 has a cylindrical shape, and has three portions having different outer diameters, specifically, a lower large-diameter portion 406 having the largest outer diameter located in the lower portion in FIG. The upper small-diameter portion 408 having the smallest outer diameter is positioned between the lower large-diameter portion 406 and the upper small-diameter portion 408, and is divided into an intermediate portion 410 having an intermediate outer diameter. Further, inside the pressing member 386, a communication path 412 having one end opened at the intermediate portion 410 and the other end opened at the center of the lower end surface of the pressing member 386 is formed.

  A cylindrical second housing member 392 in which a communication hole 414 is provided at the center of the lower end surface of the first housing member 390 is fitted into the upper large-diameter portion 398. The communication hole 414 is provided so as to communicate the inside of the second housing member 392 and the liquid chamber formed in the intermediate portion 400 of the first housing member 390. A communication hole 416 that communicates the inside and the outside is also provided on the side surface of the second housing member 392. The second housing member 392 is closed by fitting the third housing member 394 into the upper end portion of the second housing member 392. Inside the closed second housing member 392, a pressure increasing valve member 384 having a spherical shape is formed. Is housed. The diameter of the pressure increasing valve member 384 is larger than the diameter of the communication hole 414.

  The pressure reducing valve member 382, the pressure increasing valve member 384, and the pressing member 386 are urged downward by compression coil springs 418, 420, and 422, respectively. Specifically, the compression coil spring 418 has its one end in contact with a step surface provided in the middle of the pressure reducing valve member 382 and the other end in contact with the lower end surface of the pressing member 386. Is energized. One end of the compression coil spring 422 is in contact with a stepped surface formed at the boundary between the lower large diameter portion 406 and the intermediate portion 410 of the pressing member 386, and the other end is in contact with the lower end surface of the fourth housing member 392. Thus, the pressing member 386 is urged downward. Further, the compression coil spring 420 urges the pressure increasing valve member 384 downward with one end contacting the spherical surface of the pressure increasing valve member 384 and the other end contacting the lower surface of the third housing member 394. doing.

  In the pressure regulating valve device 374 configured as described above, a liquid chamber is formed in each of the lower small diameter portion 396, the upper large diameter portion 398, and the intermediate portion 400 of the first housing member 390. More specifically, the lower small diameter portion 396 is formed with a first liquid chamber 424 surrounded by an inner peripheral surface thereof, an outer peripheral surface of the pressure reducing valve member 382, and a lower end surface of the pressing member 386. The upper large-diameter portion 398 is formed with a second liquid chamber 426 surrounded by the inner peripheral surface of the second housing member 392 and the lower surface of the third housing member 394. Further, the intermediate part 400 is formed with a third liquid chamber 428 surrounded by the inner peripheral surface thereof, the outer peripheral surface of the pressing member 386, and the lower surface of the second housing member 392.

  Further, the lower small diameter portion 396 of the first housing member 390 is provided with a communication hole 430 having one end opened to the first liquid chamber 424 and the other end opened to the outer peripheral surface of the first housing member 390. The upper large-diameter portion 398 is provided with a communication hole 432 having one end communicating with the communication hole 416 of the second housing member 392 and the other end opening on the outer peripheral surface of the first housing member 390. Therefore, the second liquid chamber communicates with the outside through the communication hole 416 and the communication hole 432. The intermediate portion 400 is provided with two communication holes 434 and 436 that have one end communicating with the third liquid chamber and opening on the outer peripheral surface of the first housing member 390. In addition, a communication hole 438 that communicates the outside with the pilot pressure acting portion 404 of the pressure reducing valve member 382 is provided at the center of the lower end surface of the first housing member 390.

≪Communication path structure≫
The brake device 116 is connected to the master cylinder device 110 via liquid passages 442 and 444. The liquid passage 442 is connected to a communication hole 310 communicating with the first pressurization chamber R1, and the liquid passage 444 is communicated with a communication hole 316 communicating with the second pressurization chamber R2. That is, these fluid passages 442 and 444 serve as master pressure passages and are fluid passages for supplying the hydraulic fluid pressurized by the master cylinder device 110 to the brake device 116. Incidentally, the fluid passage 442 is connected to the brake device 116FL on the left front wheel side, and the fluid passage 444 is connected to the brake device 116RR on the right front wheel side. The liquid passage 442 and the liquid passage 444 are electromagnetic open / close valves (hereinafter also referred to as “master open / close valves”) 446 and 448 that open in a non-excited state and close in an excited state, respectively. Is provided. These master on-off valves 446 and 448 function as master pressure channel circuit breakers, and can be closed in the excited state to block the liquid passages 442 and 444, which are master pressure channels, respectively.

  Each communication passage is connected to each communication hole of the pressure regulating valve device 372 as follows. The communication hole 430 is connected to a decompression communication path 450 reaching the reservoir 122, and the decompression linear valve 372 is provided in the middle of the communication hole 430. The communication hole 432 is connected to a high-pressure communication path 452 that reaches the high-pressure source device 118. The communication hole 434 is connected to a liquid passage 454 leading to the high pressure source device 118, and the pressure increasing linear valve 370 is provided in the middle thereof. A communication passage 456 that is connected to the communication hole 324 of the master cylinder device 110 is connected to the communication hole 436 that communicates with the communication hole 434 through the second liquid chamber 428. The communication hole 438 is connected to a communication path 458 that branches from between the master on-off valve 446 provided in the liquid path 442 and the brake device 116FL.

  In addition, the communication path 456 is branched in the middle, and the communication path 460 that is the branched communication path is connected to the brake device 116 via the antilock device 114. Inside the anti-lock device 114, the communication passage 460 is branched into four, and a pressure increasing on / off valve 170 corresponding to each of the four brake devices 116 is provided at each of the branched portions. The antilock device 114 is also connected to a decompression communication path 462 that communicates with the reservoir 122. Inside the anti-lock device 114, the decompression communication passage 462 is also branched into four, and decompression on-off valves 172 corresponding to the four brake devices 116 are provided at each of the branched portions. That is, the pressure reducing communication path 462 functions as a low pressure source flow path for guiding the brake device 116 to the reservoir 122 that is a low pressure source, and the pressure reducing on-off valve 172 closes the low pressure source flow path by closing the valve. Functions as a road breaker. The four pressure increasing on / off valves 170 and the four pressure reducing on / off valves 172 are closed in the non-excited state and opened in the excited state, except for the pressure increasing on / off valves 170RL and RR corresponding to the wheels 18RL and RR. It is a solenoid valve. The pressure increasing on / off valves 170RL and RR are electromagnetic valves that open in a non-excited state and close in an excited state.

The communication path configured as described above is provided with a pressure sensor that detects the pressure of the hydraulic fluid. The liquid passage 442 is provided with a master pressure sensor [P _O ] 470 that detects the pressure of the hydraulic fluid pressurized by the master cylinder device 110 between the master opening / closing valve 446 and the master cylinder device 110. ing. A brake pressure sensor [P _B ] 472 that detects the pressure of the hydraulic fluid acting on the brake device 116 is provided between the master on-off valve 448 in the fluid passage 444 and the brake device 116. The communication path 452 has a high-pressure source pressure sensor [P _H ] 474 for detecting a high-pressure source pressure. The brake ECU 48 monitors the detection value of the high-pressure source pressure sensor 474, and the hydraulic pump 180 is controlled and driven based on the detection value. By this control drive, the high-pressure source device 118 always supplies hydraulic fluid having a set pressure or higher to the hydraulic pressure adjusting device 120. Further, the communication path 456 is provided with an adjustment pressure sensor [P _C ] 476 for detecting the adjustment pressure. The pressure-increasing linear valve 370 and the pressure-reducing linear valve 372 are controlled by the brake ECU 48 based on the detection value of the adjustment pressure sensor 476.

  In the hydraulic braking system 100 configured as described above, the antilock device 114, the high pressure source device 118, the hydraulic pressure adjusting device 120, the master on-off valves 446 and 448, the sensors, the communication passages 456 and 450, and the like ( A portion surrounded by a two-dot chain line in FIG. 2 is housed in an integrated casing, and constitutes a brake actuator 478 whose appearance is shown in FIG. Although a detailed description is omitted, the brake actuator 478 is provided with a plurality of ports, and each communication path is configured including these ports, so that the brake actuator 478 includes the brake device 116, the reservoir 122, the master. The cylinder device 110 communicates with the liquid chambers R1, R2, and R3. Thus, since the brake actuator 478 is configured to be relatively compact, even when the hydraulic fluid pressure becomes considerably high due to the operation of the hydraulic braking system 100, expansion of the fluid passage in the brake actuator 478 is suppressed. It has been. Therefore, a change in the pressure of the hydraulic fluid due to the expansion or the like is prevented.

≪Operation of master cylinder device and hydraulic pressure adjustment device≫
Below, the action | operation of the hydraulic braking system 100 in brake operation is demonstrated. In the master cylinder device 110, the input piston 208 moves forward by the operating force applied to the brake pedal 140 and compresses the two reaction force springs 290 and 292. The elastic reaction forces of these reaction force springs 290 and 292 act to advance the intermediate piston 206, and the intermediate piston 206 presses the first pressure piston 202 forward. When the first pressurizing piston 202 moves forward, the second pressurizing piston 204 moves forward accordingly, and the hydraulic fluid in the first pressurizing chamber R1 and the second pressurizing chamber R2 is pressurized. However, when the hydraulic braking system 100 operates normally, the master on-off valves 446 and 448 are energized and closed, and the first pressurizing chamber R1 and the second pressurizing chamber R2 are sealed. Therefore, the hydraulic fluid in the first pressurizing chamber R1 and the second pressurizing chamber R2 cannot be supplied to the brake device 116. That is, the first pressurizing piston 202 and the second pressurizing piston 204 cannot advance, and therefore the intermediate piston 206 cannot also advance. Therefore, the master cylinder device 110 does not supply the hydraulic fluid pressurized by the operation force to the brake device 116 in response to the operation of the brake pedal 140, but by the elastic reaction force of the two reaction force springs 290 and 292. It operates so as to generate an operation reaction force with respect to an operation force applied to the brake pedal 140 of the driver. That is, the two reaction force springs 290 and 292 function as a stroke simulator for making the driver recognize the operation reaction force.

  On the other hand, in the hydraulic pressure adjustment device 120, the hydraulic fluid supplied to the master cylinder device 110 and the brake device 116 is regulated according to the operation amount and the operation force of the brake pedal 140. Specifically, the hydraulic fluid is regulated by controlling the electric power supplied to the pressure-increasing linear valve 370 and the pressure-reducing linear valve 372 by the brake ECU 48. When the pressure-increasing linear valve 370 is opened while the pressure-reducing linear valve 372 is closed, the high-pressure hydraulic fluid is passed through the third fluid chamber 428 and the communication hole 436 of the pressure-regulating valve device 374. , Supplied to the communication path 456. When the pressure-reducing linear valve 372 is opened while the pressure-increasing linear valve 370 is closed, the hydraulic fluid in the communication passage 456 is communicated with the communication hole 436, the third liquid chamber 428, and the pressure member 386. The fluid flows into the first liquid chamber 424 through the passage 412 and flows out from the communication hole 430 to the reservoir 122 through the pressure-reducing linear valve 372. Thus, by controlling the opening / closing of the pressure-increasing linear valve 370 and the pressure-reducing linear valve 372, the pressure of the hydraulic fluid in the communication path 456 can be adjusted to the adjustment pressure. Therefore, the communication path 456 functions as a first pressure regulation flow path for supplying the hydraulic fluid regulated from the fluid pressure regulation device 120 to the master cylinder device 110. Further, since the hydraulic fluid in the communication passage 460 branched from the communication passage 456 is also set to the adjustment pressure, the communication passage 460 supplies the hydraulic fluid adjusted to the brake device 116 from the hydraulic pressure adjustment device 120. The pressure increasing on-off valve 170 functions as a second pressure regulating flow path breaker that can shut off the second pressure regulating flow path by closing the valve.

  Although detailed description is omitted, the brake ECU 48 has map data of the adjustment pressure corresponding to the hydraulic braking force, and can determine the target adjustment pressure corresponding to the target hydraulic braking force. Therefore, the brake ECU 48 can determine from the value of the adjustment pressure detected by the adjustment pressure sensor 476 whether or not the hydraulic braking force generated in the brake device 116 is the target hydraulic braking force. The pressure-increasing linear valve 370 and the pressure-reducing linear valve 372 are controlled so as to obtain the adjusted pressure. As described above, in the hydraulic braking system 100, by controlling the electric power supplied to the hydraulic pressure adjusting device 120, the braking force depending on the pressure of the hydraulic fluid adjusted by the brake device 116 according to the electric power is obtained. A pressure regulation-dependent braking force generation state that is a state to be generated is realized.

  Next, the operation of the hydraulic braking system 100 when power supply to the hydraulic pressure adjusting device 120 cannot be performed for some reason will be described. When power is not supplied to the hydraulic pressure adjusting device 120, the pressure-increasing linear valve 370 is closed in a non-excited state, and the pressure-reducing linear valve 372 is also opened in a non-excited state. Further, the brake ECU 48 sets the master on-off valves 446 and 448 so that the hydraulic fluid pressurized by the master cylinder device 110 is supplied to the brake device 116 when the hydraulic pressure adjusting device 120 is not supplied with electric power. The valve is opened as a non-excitation state. Therefore, when the brake pedal 140 is operated, the intermediate piston 206 is moved forward, the first pressurizing piston 202 and the second pressurizing piston 204 are moved forward, and the first pressurizing chamber R1 and the second pressurizing chamber R2 are moved forward. The hydraulic fluid is pressurized, and the pressurized hydraulic fluid is supplied to the brake devices 116FL and 116FR, respectively.

  The pressure of the hydraulic fluid supplied to the brake device 116FL via the communication path 458 is introduced into the pressure regulating valve device 374 of the fluid pressure adjusting device 120. The pressure regulating valve device 374 can be operated using the pressure as a pilot pressure. That is, the communication path 458 functions as a pilot pressure flow path for introducing pilot pressure to the pilot pressure operation unit 404 of the pressure regulating valve device 374. The operation of the pressure regulating valve device 374 using the pilot pressure will be described in detail. When the pilot pressure reaches a certain level, the pressure reducing valve member 382 is moved upward against the elastic force of the compression coil spring 418, and the pressing member The opening of the central portion of the lower end surface of 386 is abutted against the pressing member 386 so as to block the communication path 412. When the pilot pressure further increases, the pressing member 386 is moved upward against the elastic force of the compression coil spring 422, and the upper end portion of the pressing member 386 passes through the communication hole 414 on the lower end surface of the second housing member 392. The pressure increasing valve member 384 is pushed up. Accordingly, the communication hole 432 of the first housing member 390 communicates with the communication hole 436 through the communication hole 416, the second liquid chamber 426, the communication hole 414, and the third liquid chamber 428 of the second housing member 392. That is, the high-pressure source device 118 and the communication path 456 are communicated, and the hydraulic fluid that has been made high pressure by the high-pressure source device 118 is supplied to the supply liquid chamber R3 of the master cylinder device 110. On the other hand, when the pilot pressure decreases, the pressure regulating valve device 374 has a communication hole 430 that communicates with the communication hole 436 via the first liquid chamber 424, the communication path 412, and the third liquid chamber 428, as shown in FIG. To do. That is, the reservoir 122 and the communication path 456 communicate with each other, and the hydraulic fluid in the supply liquid chamber R3 flows out to the reservoir 122.

When the pressure regulating valve device 374 operating as described above is in a state where the pressure reducing valve member 382 is in contact with the pressing member 386 and the upper end portion of the pressing member 386 does not push up the pressure increasing valve member 384, the adjustment pressure is increased in that state. It will be maintained. The force acting on the pressure reducing valve member 382 and the force acting on the pressing member 386 in this state will be described in detail. The force pushing the pressure reducing valve member 382 upward by the pilot pressure and the force pushing the pressing member 386 downward by the adjustment pressure Is maintained in an equilibrium state. That is, if the pressure receiving area that acts on the pressure reducing valve member 382 of the pilot pressure P _P and A _1, the force pushing the pressure reducing valve member 382 upward, the A ₁ × P _P. On the other hand, if the pressure receiving area that acts on the pressing member 386 of the adjusting pressure P _C and A _2, the force pushing the pressing member 386 downward, the A ₂ × P _C. The pressure receiving area A ₁ is a cross-sectional area at the lower end of the pressure reducing valve member 382, and the pressure receiving area A ₂ is a cross-sectional area of the lower large diameter portion 406 of the pressing member 386. Assuming that the forces generated by the compression coil springs 418 and 422 are negligibly small compared to these forces, the adjusted pressure P _C is maintained in a state where A ₁ × P _P = A ₂ × P _C. It will be. Therefore, the adjustment pressure P _C is calculated by A ₁ / A ₂ × P _P. That is, the area ratio of the pressure receiving area A ₂ of the pressure receiving area A ₁ and the pressing member 386 of the pressure reducing valve member 382 is a set ratio to the pilot pressure P _P of the adjusting pressure P _C, adjusted pressure P _C, the pilot The pressure is adjusted to a pressure that is a set ratio with respect to the pressure P _P.

  Thus, the adjustment pressure that is the pressure of the hydraulic fluid supplied to the supply fluid chamber R3 is regulated by the pressure regulating valve device 374 according to the pilot pressure. Therefore, the intermediate piston 206 is advanced along with the operating force depending on the adjustment pressure. Therefore, the master cylinder device 110 pressurizes the hydraulic fluid in the first pressurizing chamber R1 and the second pressurizing chamber R2 depending on the operating force and the adjustment pressure, and is pressurized by the brake devices 116FL and FR on the front wheel side. Supply the working fluid. As described above, in the present hydraulic braking system, when power is not supplied to the hydraulic pressure adjusting device 120, the brake devices 116FL and FR generate a braking force depending on both the operating force and the adjusted pressure. The operating force / pressure regulation dependent braking force generation state, which is the state to be generated, is realized. At that time, the pressure increasing on / off valves 170FL and FR respectively corresponding to the brake devices 116FL and FR are in a non-excited state so that the hydraulic fluid supplied to the brake devices 116FL and FR does not flow back to the hydraulic pressure adjusting device 120. The valve is closed and the communication path 460 is blocked. Further, the pressure increasing on / off valves 170RL and RR corresponding to the brake devices 116RL and RR on the rear wheel side are opened, and the brake devices 116RL and RR generate a braking force according to the adjustment pressure.

The brake pressure P _B, which is the pressure of the hydraulic fluid supplied from the master cylinder device 110 to the brake devices 116FL and FR, is the operation force F, the adjustment pressure P _C, and the pressure receiving area A ₃ for the input chamber R3 of the intermediate piston 206 ( The pressure receiving area A _{4 of} the first pressurizing piston 202 and the second pressurizing piston 204 with respect to the first pressurizing chamber R1 and the second pressurizing chamber R2 (generally equal to the area of the rear end face) (generally the respective pistons 202 and 204). Can be expressed by the following formula.
P _B = (F + A ₃ × P _C ) / A ₄ = F / A ₄ + (A ₃ / A ₄ ) × P _C
Therefore, the brake pressure P _B in the operating force / pressure regulation dependent braking force generation state is determined based on the area set in the master cylinder device 110 to the pressure F / A ₄ determined based on the operating force F. The adjusted pressure P _C doubled by the coefficient (A ₃ / A ₄ ) is applied. That is, the brake pressure P _B is not operating force F only, also becomes dependent pressure to adjust pressure P _C, the brake device 116FL, FR is to generate a braking force in dependence on the brake pressure P _B.

≪Hydraulic braking system diagnosis≫
In the hydraulic braking system 100 that operates as described above, the brake ECU 48 performs a hydraulic braking system diagnosis. Roughly speaking, this diagnosis includes seven abnormality diagnosis processes for diagnosing the hydraulic braking system 100 as shown in the flowchart of FIG. Below, each abnormality diagnosis process is demonstrated according to the order shown to the flowchart of FIG. Note that the vehicle cannot be started unless the brake pedal 140 is depressed, and each abnormality diagnosis process is executed using the brake operation at the time of starting. There are diagnostic processing and diagnostic processing executed after the brake operation is released. In the following description of each abnormality diagnosis process, the relationship between the brake operation and the execution of each diagnosis process will also be described.

  In the hydraulic braking system diagnosis, power supply abnormality diagnosis processing is first executed. The power supply abnormality diagnosis process diagnoses whether or not electric power is normally supplied to a portion that is operated by electric power, such as the high pressure source device 118, the fluid pressure adjusting device 120, each on-off valve, and each sensor. Further, the power supply to the brake ECU 48 itself is diagnosed. This power supply abnormality diagnosis process is executed when the brake is operated.

  Next, an input system abnormality diagnosis process for diagnosing whether there is an abnormality in pressurization of the hydraulic fluid in the first pressurizing chamber R1 and the second pressurizing chamber R2 by the operation force input by the driver is executed. The input system abnormality diagnosis process is executed based on the detected value of the operating force sensor 146 and the detected value of the master pressure sensor 470 with respect to the operation of the brake pedal 140 with the master on-off valves 446 and 448 closed. Therefore, the brake ECU 48 stores map data indicating the relationship between the operation amount and the master pressure. In the input system abnormality diagnosis process, the detected value of the operating force sensor 146 and the detected value of the master pressure sensor 470 are maps. By comparing with the data, it is diagnosed whether there is any abnormality in pressurizing the hydraulic fluid by the operation force input by the driver.

  Next, a pressure adjustment system abnormality diagnosis process for diagnosing whether there is an abnormality in the supply of the hydraulic fluid adjusted by the hydraulic pressure adjusting device 120 to the supply liquid chamber R3 and the pressure increasing on-off valve 170 is executed. In the pressure regulation system abnormality diagnosis process, the pressure increasing on-off valve 170 and the master on-off valves 446, 448 are closed, and the hydraulic fluid adjusted by the pressure increasing linear valve 170 and the pressure reducing linear valve 172 is communicated with the communication paths 456, 460. To be supplied. Therefore, the pressurized hydraulic fluid is supplied to the pressure increasing on-off valve 170 and the supply fluid chamber R3 of the master cylinder device 110. At this time, in the pressure regulation system abnormality diagnosis process, the detected value of the adjustment pressure sensor 476 is compared with a preset value, whereby the regulated hydraulic fluid is supplied to the supply fluid chamber R3 and the pressure increasing on / off valve 170. It is diagnosed whether the supply is normal.

Next, a brake system abnormality diagnosis process for diagnosing whether there is an abnormality in the supply of the hydraulic fluid adjusted by the hydraulic pressure adjusting device 120 to the brake device 116 is executed. In the brake system abnormality diagnosis process, the pressure increasing on / off valve 170 is opened, the pressure reducing on / off valve 172 and the master on / off valves 446 and 448 are closed, and the adjustment pressure P _C is set in advance as the brake pressure diagnosis target pressure. After the electric power supplied to the hydraulic pressure adjusting device 120 is controlled so as to be P _T1 , the pressure increasing linear valve 370 and the pressure reducing linear valve 372 are closed. Thus, the brake device 116 becomes a state of being actuated by hydraulic fluid brake pressure diagnosis target pressure P _T1, the braking pressure adjusting pressure P _C of the preset time T _B after this state has been set in advance When the pressure is lower than the abnormality diagnosis pressure P _C1, it is diagnosed that there is an abnormality in the supply of the regulated hydraulic fluid to the brake device 116.

Next, a pilot pressure-dependent pressure adjustment function abnormality diagnosis process for diagnosing whether there is any abnormality when the hydraulic pressure adjusting device 120 operates with the pilot pressure-dependent pressure adjustment function is executed. In the pilot pressure-dependent pressure regulation function abnormality diagnosis process, the pressure increasing on / off valve 170 is opened, the pressure reducing on / off valve 172 and the master on / off valves 446 and 448 are closed, and the adjustment pressure P _C is set in advance. The electric power supplied to the hydraulic pressure adjusting device 120 is controlled so as to be the dependent pressure adjusting function diagnosis target pressure _PT2, and the pressure increasing on / off valve 170 is closed. In other words, the brake device 116, the working fluid is contained, which is a pilot pressure dependent pressure regulating function diagnosis target pressure P _T2, which is the first set pressure. Further, the supply of power to the pressure-increasing linear valve 370 and the pressure-reducing linear valve 372 is stopped, the pressure-increasing linear valve 370 is closed, and the pressure-reducing linear valve 372 is opened. Therefore, the hydraulic pressure adjusting device 120 operates with a pilot pressure dependent pressure adjusting function using the pilot pressure dependent pressure adjusting function diagnostic target pressure _PT2 as a pilot pressure. When the pilot pressure dependent pressure regulating function is normal, adjusted pressure P _C, the pressure to be set ratio to the pilot pressure dependent pressure regulating function diagnosis target pressure P _T2, i.e., the pilot pressure dependent adjustment is normal at standard pressure Pressure _PCP . In the pilot pressure dependent pressure regulation function abnormality diagnosis processing, the adjustment pressure P _C is, pilot pressure dependent adjustment pressure P _CP set is provided a margin pressure, i.e., at a set pressure below the pilot pressure dependent adjustment pressure P _CP When the pilot pressure dependent abnormality diagnostic pressure P _C2 is below, it is diagnosed that the pilot pressure dependent pressure regulating function of the hydraulic pressure adjusting device 120 is abnormal. The pilot pressure-dependent pressure regulation function abnormality diagnosis process is executed by closing the pressure increasing on-off valve 170 during a brake operation and setting the pilot pressure at that time as the pilot pressure-dependent pressure regulation function diagnostic target pressure _PT2. .

In the hydraulic braking system 100, it is possible to execute the pilot pressure-dependent pressure regulation function abnormality diagnosis process even when the vehicle is traveling. Specifically, when the amount of operation of the brake pedal 140 is constant during braking while the vehicle is running, the pressure increasing on / off valve 170 is closed for a very short time to operate the brake device 116. Pilot pressure-dependent pressure regulation by shutting off the power supply to the fluid pressure regulator for a very short time with the liquid contained and the pressure of the contained hydraulic fluid as the pilot pressure-dependent pressure regulation function diagnostic target pressure P _T2 Functional abnormality diagnosis processing can be executed.

Next, by the pressure increasing on / off valve 170 provided in the communication path 460, the communication path 460, that is, the second pressure adjusting flow path for supplying the hydraulic fluid adjusted from the hydraulic pressure adjusting device 120 to the brake device 116 is normally set. A second pressure regulation flow passage interruption abnormality diagnosis process for diagnosing whether the passage is interrupted is executed. In the second regulating fluid path blocking diagnostic process, intensifying off valve 170 is closed, adjusted pressure P _C is preset fluid pressure adjusting such that the first shut-off diagnosis target pressure P _T3 as a second set pressure The power supplied to the device 120 is controlled, and then the pressure increasing linear valve 370 and the pressure reducing linear valve 372 are closed. At this time, when an abnormality such as liquid leakage occurs in the pressure increasing on-off valve 170, the pressure of the hydraulic fluid in the communication path 460 becomes the first cutoff diagnosis target pressure _PT3 . Here, when the pressure reducing on / off valve 172 is opened, the pressure of the hydraulic fluid between the pressure increasing on / off valve 170 and the brake device 118 in the communication path 460 becomes atmospheric pressure. Accordingly, the hydraulic fluid between the pressure increasing on / off valve 170 and the fluid pressure adjusting device 120 in the communication path 460 flows out to the brake device 118 side due to the abnormality of the pressure increasing on / off valve 170, and the adjustment pressure P _C is the first pressure. It will fall from 1 interruption | blocking diagnosis target pressure _PT3 . By utilizing the fact that the second adjusting pressure flow path blocking abnormality diagnosis processing, the adjustment pressure P _C is set reference pressure is provided a margin to the first shut-off diagnosis target pressure P _T3, i.e., the first blocking diagnostic objective If it falls below a second pressure regulating fluid path blocking diagnosis pressure P _C3, which is set in the following pressure P _T3, it is diagnosed that there is an abnormality in the blocking of the second regulating pressure passage by intensifying off valve 170.

In addition, although detailed explanation is omitted, each of the four pressure reducing on / off valves 172 is not opened at the same time, but is opened in order, so that the abnormalities in the shutoff of the second pressure regulating flow path are increased. It can also be specified whether the on-off valve 170 is generated. In other words, shut off even vacuum-off valve 172 is opened corresponding to the intensifying-off valve 170 which is normally performed, the adjustment pressure P _C is less than the second pressure regulating fluid path blocking diagnosis pressure P _C3 However, if the pressure reducing on / off valve 172 corresponding to the pressure increasing on / off valve 170 having an abnormal shutoff is opened, the regulated pressure P _C will be lower than the second pressure regulation flow path shutoff abnormality diagnostic pressure P _C3 . By utilizing this fact, it is possible to specify which pressure increasing on-off valve 170 is abnormal.

Next, a high-pressure supply abnormality diagnosis process for diagnosing whether there is an abnormality in the supply of hydraulic fluid from the high-pressure source device 118 is executed. In the high-pressure supply abnormality diagnosis process, the pressure increasing on-off valve 170 and the master on-off valves 446, 448 are closed, the pressure increasing linear valve 370 is opened, and the hydraulic fluid having a high pressure is supplied from the high pressure source device 118. At this time, it is diagnosed whether there is any abnormality based on the high pressure source pressure P _H which is a detection value of the high pressure source pressure sensor 474. That is, in the high-pressure supply abnormality diagnosis process, when the high-pressure source pressure P _H falls below a preset value, the level of decrease in the high-pressure source pressure P _H is considered to be too large, and there is an abnormality in the supply of hydraulic fluid at a high pressure. Diagnose it.

  Of these abnormality diagnosis processes, the pilot pressure-dependent pressure adjustment function abnormality diagnosis process and the second pressure regulation flow path interruption abnormality diagnosis process are claims of the hydraulic braking system 100.

  As described above, the pressure of the hydraulic fluid is used in each abnormality diagnosis process except for the power supply abnormality diagnosis process. Therefore, in order for each diagnosis process to be performed appropriately, it is necessary to accurately detect the difference in pressure of the hydraulic fluid between the normal case and the abnormal case. In the hydraulic braking system 100, as described above, the brake actuator 478 having an integrated housing is employed, so that expansion of the fluid passage in the brake actuator 478 is suppressed. Therefore, when an abnormality occurs in the brake actuator 478, the abnormality is likely to appear as a change in the pressure of the hydraulic fluid, even if the liquid leakage due to the abnormality is minute. For this reason, the hydraulic braking system 100 can accurately detect a difference in pressure of the hydraulic fluid between a normal case and an abnormal case, and can appropriately execute each diagnosis process.

  When each abnormality diagnosis process is performed in this way, if the hydraulic braking system 100 is abnormal based on the diagnosis results, the cause of the abnormality is specified. FIG. 6 is a table for identifying the cause of the abnormality of the hydraulic braking system 100 based on the diagnosis result of each abnormality diagnosis process. N in the table indicates that the diagnosis result is normal, and AN indicates that the diagnosis result is abnormal. By combining these normal or abnormal diagnosis results, the hydraulic braking system 100 is diagnosed as normal or an abnormality in which the cause of the abnormality is specified as any one of [abnormal cause 1] to [abnormal cause 12]. .

  The table of FIG. 7 shows the contents of the abnormality in each case of [Cause 1] to [Cause 12]. Hereinafter, the cause of the abnormality identified by the combination of the abnormality diagnosis results and the content of the abnormality of the identified abnormality cause will be described. When it is diagnosed that there is an abnormality in the power supply abnormality diagnosis process, the cause of the abnormality is specified as [Abnormal Cause 1]. [Cause of abnormality 1] indicates that an abnormality has occurred in the supply of power to the high-pressure source device 118, the hydraulic pressure adjustment device 120, each on-off valve, each sensor, and the like. When it is diagnosed that there is an abnormality only by the input system abnormality diagnosis process, the cause of the abnormality is specified as [Abnormal Cause 2]. [Abnormal cause 2] indicates that an abnormality such as sticking or liquid leakage occurs in the master cylinder device 110.

When it is diagnosed that there is an abnormality only by the pressure regulation system abnormality diagnosis process, the cause of the abnormality is specified as [Abnormal Cause 3]. [Abnormal cause 3] indicates that an abnormality such as sticking or liquid leakage occurs in the pressure-increasing linear valve 170 or the pressure-reducing linear valve 172. In addition to the case of [Abnormality cause 3], when it is diagnosed that there is an abnormality in the pilot pressure dependent pressure regulation function abnormality diagnosis process, the cause of the abnormality is identified as [Abnormality cause 4]. [Cause of Abnormality 4] is that the hydraulic pressure adjusting device 120 including the pressure-increasing linear valve 170 and the pressure-decreasing linear valve 172 cannot be normally adjusted by the pilot pressure-dependent pressure adjusting function. Indicates that an abnormality such as liquid leakage has occurred. When it is diagnosed that there is an abnormality in the high pressure supply abnormality diagnosis process in addition to the case of [Abnormality cause 4], the cause of the abnormality is specified as [Abnormality cause 5]. Abnormal Cause 5], since that is no longer able to supply of hydraulic fluid is a high pressure, the abnormality has occurred in locations exposed to the high pressure source pressure P _H of the high-pressure decompressor 118 or the fluid pressure adjusting device 120 Represents.

When it is diagnosed that there is an abnormality in the brake system abnormality diagnosis process, the cause of the abnormality is specified as [Abnormal Cause 6]. [Abnormal Cause 6] indicates that an abnormality such as a liquid leak has occurred at a location where the pressure of the hydraulic fluid adjusted by the hydraulic pressure adjusting device 120 acts. However, because the pilot pressure-dependent pressure regulation function abnormality diagnosis process is normal, when the hydraulic pressure adjustment device 120 operates with the pilot pressure-dependent pressure regulation function, an abnormality has occurred other than at the location where the pilot pressure acts. become. In addition to the case of [Abnormal Cause 6], when it is diagnosed that there is an abnormality in the high-pressure supply abnormality diagnosis process, the cause of the abnormality is specified as [Abnormal Cause 7]. [Abnormality cause 7] is similar to [Abnormality cause 6], because abnormalities such as liquid leakage occur in places other than the place where the pilot pressure acts, and the high pressure source pressure PH is _greatly reduced. This indicates that an abnormality with a large degree of liquid leakage has occurred.

  When it is diagnosed that there is an abnormality in the brake system abnormality diagnosis process and the pilot pressure dependent pressure adjustment function abnormality diagnosis process, the cause of the abnormality is specified as [Abnormal Cause 8]. Contrary to [Abnormal Cause 6], [Abnormal Cause 8] has an abnormality in the pilot pressure-dependent pressure regulation function abnormality diagnosis process, and therefore an abnormality such as liquid leakage has occurred at a location where the pilot pressure acts. Represents. When the high-pressure supply abnormality diagnosis process is diagnosed as abnormal in addition to the case of [abnormal cause 8], the cause of the abnormality is identified as [abnormal cause 9]. [Abnormality cause 9] is contrary to [Abnormality cause 7], an abnormality such as a liquid leak has occurred at the location where the pilot pressure is applied, and a large abnormality such as a liquid leakage has occurred. Represents.

When the abnormality is detected in the pilot pressure-dependent pressure adjustment function abnormality diagnosis process and the second pressure adjustment flow path interruption abnormality diagnosis process is diagnosed as normal, the cause of the abnormality is identified as [abnormal cause 10]. . If there is an abnormality in the pilot pressure-dependent pressure adjustment function abnormality diagnosis process, it indicates that an abnormality has occurred when operating in the pilot pressure-dependent pressure adjustment function of the hydraulic pressure adjustment device 120. In addition, When the pressure regulation flow passage cutoff abnormality diagnosis process is normal, it indicates that an abnormality due to the sticking of the valve body or the like in the adjustment pressure device 374 has occurred. That is, in the case where liquid leakage has occurred in the adjustment pressure device 374, the adjustment pressure P _{C that} is the first cutoff diagnosis target pressure P _T3 is set to the atmospheric pressure in the second pressure regulation channel cutoff abnormality diagnosis process. Therefore, the adjustment pressure P _C falls below the pressure regulation channel blockage abnormality diagnosis pressure P _C3 . Therefore, when the pilot pressure-dependent pressure regulation function abnormality diagnosis process is abnormal and the second pressure regulation flow path interruption abnormality diagnosis process is normal [abnormal cause 10], the valve body or the like is stuck in the regulating pressure device 374. It represents that. Further, in addition to the case of [Abnormality cause 10], when it is diagnosed that there is an abnormality in the second pressure regulation flow passage interruption abnormality diagnosis process, the cause of the abnormality is identified as [Abnormality cause 11]. [Cause of abnormality 11] indicates that liquid leakage has occurred in the adjusting pressure device 374 from the above. When it is diagnosed that there is an abnormality only by the second pressure regulation flow path interruption abnormality diagnosis process, the cause of the abnormality is specified as [abnormal cause 12]. [Abnormality cause 12] indicates that an abnormality has occurred in the blocking of the second pressure regulation flow path by the pressure increasing on-off valve 170.

As described above, whether the pilot pressure-dependent pressure regulation function abnormality diagnosis process of the abnormality diagnosis of the hydraulic pressure braking system is an abnormality in its own diagnosis result is whether the valve member or the like in the regulating pressure device 374 is fixed or leaks. Cannot be specified. In other words, if there is any abnormality, the adjustment pressure P _C may be lower than the pilot pressure-dependent abnormality diagnosis pressure P _C2 in the execution of the pilot pressure-dependent pressure adjustment function abnormality diagnosis process. However, if the diagnosis result of the pilot pressure-dependent pressure regulation function abnormality diagnosis process is normal according to the diagnosis result of the second pressure regulation channel blockage abnormality diagnosis process, the abnormality due to the sticking of the valve body or the like in the adjustment pressure device 374 If it is abnormal, it can be diagnosed as abnormal due to liquid leakage of the adjusting pressure device 374. As described above, the present hydraulic braking system identifies the cause of the abnormality in more detail by performing the diagnosis on the pilot pressure-dependent pressure adjusting function based on the diagnosis result on the blocking abnormality of the second pressure adjusting flow path. Is possible.

≪Operation mode of hydraulic braking system≫
The brake ECU 48 is an operation mode switching process for switching the operation of the hydraulic braking system 100 based on whether the above-described normal or the cause of the abnormality is [the cause of abnormality 1] to [the cause of abnormality 12]. Execute. By the operation mode switching process, the hydraulic braking system 100 is operated in one of the operation modes 1 to 3. Specifically, when the hydraulic braking system 100 is normal, the operation mode 1 is selected, and when the abnormality is caused by [Abnormality cause 1] to [Abnormality cause 7], the operation mode 2 is selected. In the case of [abnormality cause 12], the operation is performed in the operation mode 3. Explaining these three operation modes, the hydraulic braking system 100 is operated in the pressure-dependent braking force generation state in the operation mode 1, and is operated in the operation force / pressure-dependent braking force generation state in the operation mode 2. In operation mode 3, since the pilot pressure-dependent pressure regulation function does not operate normally, the other three brake devices 116 excluding the brake device 116FL communicating with the communication passage 458 serving as the pilot pressure flow path perform pressure regulation-dependent braking force. Operated in the generated state. That is, in the operation mode 3, the operation of the brake device 116FL is prohibited.

≪Flow of each abnormality diagnosis process≫
The brake ECU 48 executes each diagnosis process of the hydraulic braking system diagnosis according to the flowchart shown in FIG. Each diagnosis process is performed by executing each program stored in the brake ECU 48. That is, the hydraulic braking system diagnosis is executed by executing each diagnosis processing program. FIG. 8 to FIG. 10 show the flowcharts of the programs of the brake system abnormality diagnosis process, the pilot pressure-dependent pressure adjustment function abnormality diagnosis process, and the second pressure regulation flow passage interruption abnormality diagnosis process that are deeply related to the claimable invention. Show.

The brake system abnormality diagnosis process is executed according to a program whose flowchart is shown in FIG. In the processing according to this program, each on-off valve is controlled in step 1 (hereinafter abbreviated as “S1”, the same applies to other steps), and the adjustment pressure P _C is determined in S3 by the operation of the hydraulic pressure adjustment device 120. Is set to the brake pressure diagnosis target pressure _PT1 . Next, after each of the linear valves time has brought closed T _B, in S6, adjusting pressure P _C after time T _B has elapsed is diagnosed whether lower than the brake圧異normal diagnostic pressure P _C1 . If it has decreased, it is diagnosed in S7 that the brake pressure is abnormal, that is, there is an abnormality in the supply of the hydraulic fluid regulated by the hydraulic pressure adjusting device 120 to the brake device 116.

The pilot pressure-dependent pressure regulation function abnormality diagnosis process is executed according to the program shown in the flowchart of FIG. In the process according to this program, in S11, the valves are controlled by the operation of the fluid pressure adjusting device 120, in S13, the adjustment pressure P _C is taken as a pilot pressure dependent pressure regulating function diagnosis target pressure P _T2. Next, the pressure increasing on-off valve 170 and the pressure increasing linear valve 370 are closed, the pressure reducing linear valve 372 is opened, and whether or not the adjusted pressure P _C is lower than the pilot pressure dependent abnormality diagnostic pressure P _C2 in S15. Is diagnosed. When it is below, in S16, it is diagnosed that the pilot pressure dependent pressure regulation function of the hydraulic pressure adjusting device 120 is abnormal.

Further, the second pressure regulation flow path interruption abnormality diagnosis process is executed according to the program shown in the flowchart of FIG. In the process according to this program, in S21, is then closed is intensifying off valve 170, by the operation of the fluid pressure adjusting device 120, in S23, the adjustment pressure P _C is caused to the first shut-off diagnosis target pressure P _T3. Next, each linear valve is closed, the pressure reducing on-off valve 172 is opened, and in S26, it is diagnosed whether or not the adjusted pressure P _C does not reach the second pressure regulating flow passage cutoff abnormality diagnostic pressure P _C3. . If it has decreased, it is diagnosed in S27 that there is an abnormality in the blocking of the second pressure regulation flow path by the pressure increasing on-off valve 170.

≪Brake ECU functional configuration≫
In such a hydraulic braking system 100, the brake ECU 48 controls the electric power supplied to the hydraulic pressure adjusting device 120 and the operation of each on-off valve, and executes the hydraulic braking system diagnosis and the switching of the operation mode. It can be thought of as a control device. In addition, the brake ECU 48 can be considered to have several functional units that perform these operations. Specifically, as shown in FIG. 2, the brake ECU 48 executes an operation mode switching processing unit 480 that operates the hydraulic braking system 100 in the operation modes 1 to 3 as an operation control unit, and a hydraulic braking system diagnosis. It can be considered that an abnormality diagnosis unit 482 is included. In addition, the abnormality diagnosis unit 482 is a function unit that executes each abnormality diagnosis, for example, a brake pressure abnormality diagnosis unit 484 that executes a brake system abnormality diagnosis process, or a pilot pressure dependency that executes a pilot pressure-dependent pressure adjustment function abnormality diagnosis process. It can be considered that the pressure regulation function abnormality diagnosis unit 486, the second pressure regulation flow passage interruption abnormality diagnosis unit 488 that executes the second pressure regulation flow passage interruption diagnosis processing, and the like.

≪Modification≫
In the diagnosis process for blocking the second pressure regulation flow path of the hydraulic braking system 100, another diagnostic process can be used instead of the above-described second pressure regulation flow path cutoff abnormality diagnosis process. The diagnosis process will be described below.

The second regulating fluid path blocking diagnostic process of the present modification, so that intensifying off valve 170 is opened, adjusted pressure P _C is the first shut-off diagnosis target pressure P _T3 set in advance as the second set pressure In addition, the power supplied to the hydraulic pressure adjusting device 120 is controlled. Then, the valve is closed pressure-intensifying off valve 170, as adjusted pressure P _C is the second cutoff diagnosis target pressure P _T4 set in advance as a third set pressure, the power supplied to the fluid pressure adjusting device 120 Be controlled. Next, when the pressure-increasing linear valve 370 and the pressure-reducing linear valve 372 are closed, the pressure of the hydraulic fluid on the fluid pressure adjusting device 120 side from the pressure-increasing on-off valve 170 is changed to the second cutoff diagnostic target pressure. P _T4, and the pressure of the working fluid of the braking device 116 side is the first cutoff diagnosis target pressure P _T3. Therefore, a pressure difference is generated before and after the pressure increasing on / off valve 170, and when an abnormality such as leakage occurs in the pressure increasing on / off valve 170, the hydraulic fluid on the hydraulic pressure adjusting device 120 side is supplied with the brake device 116. It flows to the side, adjusting pressure P _C is lowered from the second cutoff diagnosis target pressure P _T4. Therefore, adjustment pressure P _C is set reference pressure is provided a margin to the second shut-off diagnosis target pressure P _T4, that is, the second adjusting pressure passage blocking abnormality diagnosis is set below the second cutoff diagnosis target pressure P _T4 In the case where the pressure P _C4 is not reached, the second pressure regulation flow path interruption abnormality diagnosis process diagnoses that there is an abnormality in the interruption of the second pressure regulation flow path by the pressure increasing on-off valve 170.

The second pressure regulation flow path interruption abnormality diagnosis process of the present modification is executed according to a program whose flowchart is shown in FIG. In the process according to this program, in S31, it is opened the pressure-intensifying off valve 170, by the operation of the fluid pressure adjusting device 120, in S33, the adjustment pressure P _C is the first cutoff diagnosis target pressure P _T3. Next, in S34, each of the linear valve is closed, pressure reducing off valve 172 is opened, in S35, the adjustment pressure P _C is a second shut-off diagnosis target pressure P _T4. Next, each linear valve is closed, and in S37, it is diagnosed whether or not the adjusted pressure P _C does not reach the second pressure regulation flow passage cutoff abnormality diagnostic pressure P _C4 . If not, it is diagnosed in S38 that there is an abnormality in the blocking of the second pressure regulating flow path by the pressure increasing on-off valve 170.

  The hardware configuration of the hydraulic braking system 500 according to the present embodiment is substantially the same as that of the previous hydraulic braking system 100 except for the hydraulic pressure adjusting device. The connected liquid passages are shown in FIG. 12, and the entire system drawing and description thereof are omitted.

≪Configuration of hydraulic pressure adjustment device≫
The hydraulic pressure adjusting device 501 is an electromagnetic linear valve. As shown in FIG. 12, a hollow housing 502 and a plunger 504 provided in the housing 502 so as to be movable in the axial direction thereof. And a cylindrical coil 506 provided on the outer periphery of the housing 502. The housing 502 includes a bottomed cylindrical lower outer shell member 508 provided below, a covered cylindrical upper outer shell member 510 provided above, the lower outer shell member 508, and the upper outer shell member 510. Are formed by a generally cylindrical core 512 and a lidded cylindrical partition member 514 provided inside the upper outer shell member 510.

  The core 512 includes a flange portion 516 having the largest outer diameter, a lower portion 518 having an outer diameter smaller than the outer diameter of the flange portion 516 and positioned below the flange portion 516, and a flange portion 516 positioned above the flange portion 516. An upper first outer diameter portion 520 having an outer diameter smaller than the outer diameter of the upper first outer diameter portion 520 and an upper second outer diameter having an outer diameter smaller than the outer diameter of the upper first outer diameter portion 520. Part 522. The lower portion 518 of the core 512 is fixedly fitted to the lower outer shell member 508, and the coil 506 is disposed on the lower surface side of the flange portion 516 so as to be fitted to the lower outer shell member 508. .

  The core 512 is formed with a through hole 524 penetrating in the axial direction of the housing 502. The plunger 504 includes a rod portion 526 inserted into the through hole 524, a lower end surface of the core 512, and a lower outer shell member 508. And a main body portion 528 disposed between the inner bottom surface and the inner bottom surface. The rod portion 526 has a large-diameter portion 530 that is positioned below and has a large outer diameter, and a small-diameter portion 532 that is positioned above and has a large outer diameter, and the inner peripheral surface of the through hole 524 is positioned above. It is divided into a large inner diameter portion 534 having a large inner diameter and a small inner diameter portion 536 having a small inner diameter located below. The large diameter portion 530 of the rod portion 526 is slidably fitted to the small inner diameter portion 536 of the through hole 524, and the small diameter portion 532 of the rod portion 526 is provided with a clearance in the large inner diameter portion 534 of the through hole 524. Is inserted.

  The upper outer shell member 510 has a first inner diameter portion 540 having a largest inner diameter located at the lower end portion, and a second inner diameter portion 542 having an inner diameter smaller than the inner diameter of the first inner diameter portion 540 and located above the first inner diameter portion 540. A third inner diameter portion 544 having the smallest inner diameter located at the upper end portion, and located between the third inner diameter portion 544 and the second inner diameter portion 542 and smaller than the inner diameter of the second inner diameter portion 542 and the third inner diameter portion And a fourth inner diameter portion 546 having an inner diameter larger than the inner diameter of the portion 544. The upper second outer diameter portion 522 of the core 512 is fixedly fitted to the second inner diameter portion 542 of the upper outer shell member 510, and the upper first outer diameter portion 520 of the core 512 is fixed to the upper outer shell member 510. The first inner diameter portion 540 is fixedly fitted. The step surface between the upper first outer diameter portion 520 and the upper second outer diameter portion 522 and the step surface between the first inner diameter portion 540 and the second inner diameter portion 542 are separated from each other. The first liquid chamber 548 is partitioned by the step surface, the upper second outer diameter portion 522, and the first inner diameter portion 540. Note that the upper outer shell member 510, the lower outer shell member 508, and the core 512 function as main body members constituting the housing 502.

  The partition member 514 has a large-diameter portion 550 having a large outer diameter located at the lower end portion and a small-diameter portion 552 having a small outer diameter located at the upper end portion, and the small-diameter portion 552 is the second outer portion of the upper outer shell member 510. The large-diameter portion 550 is slidably fitted to the third inner-diameter portion 544 and the fourth inner-diameter portion 546 of the upper outer shell member 510, respectively. A coil spring 554 is disposed between the lower end surface of the partition member 514 and the upper end surface of the core 512 in a compressed state. The partition member 514 is biased upward by the elastic force of the coil spring 554, and the upper end surface of the lid portion of the partition member 514 and the inner surface of the lid of the upper outer shell member 510 are in contact with each other. The upper end surface of the partition member 514 is slightly recessed, and the second liquid chamber 556 is partitioned by the recessed portion and the inner surface of the lid of the upper outer shell member 510. Further, the step surface between the large diameter portion 550 and the small diameter portion 552 is separated from the step surface between the third inner diameter portion 544 and the fourth inner diameter portion 546, and the two step surfaces and the small diameter portion are separated. A third liquid chamber 558 is partitioned by 552 and the fourth inner diameter portion 546.

  Further, a disc-shaped reaction disk 560 is provided inside the lid of the partition member 514. The reaction disk 560 is supported by the lid portion of the partition member 514 on the upper surface thereof. A generally hollow cylindrical first moving member 566 is slidably fitted to the inner peripheral portion 562 of the partition member 514, and the upper end surface of the first moving member 566 contacts the lower surface of the reaction disk 560. ing. The first moving member 566 includes a projecting portion 568 projecting in the radial direction on the outer peripheral surface substantially in the middle thereof, an upper cylindrical portion 569 positioned above the projecting portion 568, and a lower cylinder positioned below the projecting portion 568. Part 570. Moreover, the downward opening of the inner peripheral part 562 of the partition member 514 is tapered, and the protruding part 568 of the first moving member 566 can be seated in the opening. That is, the protruding portion 568 can function as a valve body that can block the opening of the partition member 514. Further, the lower cylindrical portion 570 of the protruding portion 568 is slidably fitted to the large inner diameter portion 534 of the through hole 524. With such a structure, the fourth liquid chamber is formed by the fourth inner diameter portion 546 of the upper outer shell member 510, the lower end surface of the partition member 514, the upper end surface of the core 512, and the lower cylindrical portion 570 of the first moving member 566. 572 is defined.

  A coil spring 573 is disposed in a compressed state between the lower end surface of the first moving member 566 and the upper end surface of the core 512. The first moving member 566 is urged by the elastic force of the coil spring 573 in the direction in which the protruding portion 568 of the first moving member 566 is seated on the opening of the inner peripheral portion 562, and the protruding portion 568 is in the inner peripheral portion 562. Sitting in the opening. Further, the outer peripheral surface of the first moving member 566 is slightly recessed, and the fifth liquid chamber 576 is partitioned by the recessed portion of the outer peripheral surface of the first moving member 566 and the inner peripheral portion 562 of the partition member 514. Yes.

  Inside the first moving member 566, a generally cylindrical second moving member 578 is provided as a penetrating body. The second moving member 578 is provided in the first moving member 566 so as to be slidable in the axial direction with its upper end in contact with the reaction disk 560. The outer peripheral surface of the second moving member 578 is slightly recessed, and a clearance 580 exists between the recessed portion and the inner peripheral surface of the first moving member 566. The lower end of the second moving member 578 extends downward from the first moving member 566 and is slidably fitted into the through hole 524 of the core 512.

  A communication hole 582 that connects the clearance 580 and the fourth liquid chamber 572 is formed in the wall surface of the first moving member 566, and the working fluid in the fourth liquid chamber 572 also enters the clearance 580 through the communication hole 582. Inflow. That is, the communication hole 582 and the clearance 580 also function as a part of the fifth liquid chamber 576. In addition, an internal communication path 584 that opens to the lower end surface and the outer peripheral surface and communicates between the clearance 580 and the inside of the through hole 524 is formed inside the second moving member 578. The opening to the inside of the through hole 524 of the internal communication path 584 is tapered and faces the tip of the rod portion 526 of the plunger 504. In addition, the coil spring 586 is compressed between the surface of the second moving member 578 having the tapered opening and the step surface between the large diameter portion 530 and the small diameter portion 532 of the rod portion 526. The plunger 504 is biased downward by the elastic force of the coil spring 586. Therefore, the distal end of the plunger 504 is urged in the direction in which the distal end of the plunger 504 is separated from the opening of the internal communication path 584 by the elastic force of the coil spring 586, and resists the elastic force of the coil spring 586. By moving the plunger 504 upward, the tip of the plunger 504 is seated on the opening of the internal communication path 584.

  A clearance 590 exists between the slightly recessed portion of the large diameter portion 550 of the partition member 514 and the fourth inner diameter portion 546 of the upper outer shell member 510, and a high-pressure port 592 that opens to the clearance 590 is provided. The fourth inner diameter portion 546 is formed. A first communication passage 594 that communicates the clearance 590 and the fifth liquid chamber 576 is formed so as to extend in the radial direction of the partition member 514, and the high pressure port 592 reaches the high pressure source pressure device 118. Liquid passage is connected. That is, it is possible to supply hydraulic fluid having a high pressure source pressure to the fifth liquid chamber 576 via the high pressure port 592, the clearance 590, and the first communication path 594.

  A low pressure port 600 that opens to the first liquid chamber 548 is formed in the first inner diameter portion 540 of the upper outer shell member 510, and the first liquid chamber 548 reaches the reservoir 122 via the low pressure port 600. Liquid passage is connected. A second communication passage 602 that connects the first liquid chamber 548 and the large inner diameter portion 534 of the through hole 524 is formed to extend in the radial direction in the core 512, and the second communication passage 602 and the through hole are formed. 524 also functions as a part of the first liquid chamber 548. Hereinafter, the first liquid chamber 548, the second communication passage 602, and the through hole 524 may be collectively referred to as the first liquid chamber 548 or the like. Further, a drain port 604 that opens to the third liquid chamber 558 is formed in the fourth inner diameter portion 546 of the upper outer shell member 510, and a liquid passage that communicates with the reservoir 122 is connected to the third outer portion 510 via the drain port 604. It is connected to the liquid chamber 558 and the volume change of the third liquid chamber 558 is allowed.

  A port 608 that opens to the fourth liquid chamber 572 is formed in the fourth inner diameter portion 546 of the upper outer shell member 510, and the communication path 456 that is the first communication path is connected to the fourth liquid chamber via the port 608. Connected to chamber 572. In addition, a port 610 that opens to the second liquid chamber 556 is formed in the lid portion of the upper outer shell member 510, and the communication path 458 is connected to the second liquid chamber 556 via the port 610. . With this structure, the hydraulic pressure adjusting device 501 can also control the adjustment pressure by controlling the electric power to the coil 506 in the same manner as the hydraulic pressure adjusting device 120 of the previous hydraulic braking system 100. It is possible.

≪Operation of hydraulic pressure adjustment device≫
With the above-described structure, when the current is not supplied to the coil 506, the hydraulic pressure adjusting device 501 blocks the flow of hydraulic fluid from the fifth liquid chamber 576 to the fourth liquid chamber 572, and the fourth liquid chamber 572. The flow of the working fluid from the first to the first fluid chamber 548 and the like is allowed. That is, when no current is supplied to the coil 506, the fourth liquid chamber 572 communicates with the reservoir 122, and the adjustment pressure that is the pressure of the working fluid in the fourth liquid chamber 572 is atmospheric pressure. Further, by supplying current to the coil 506, the flow of the working fluid from the fourth fluid chamber 572 to the first fluid chamber 548 and the like is interrupted, and the working fluid from the fifth fluid chamber 576 to the fourth fluid chamber 572 is blocked. By allowing the flow of the pressure, the adjustment pressure can be increased. Further, by decreasing the amount of power supplied to the coil 506 after increasing the adjustment pressure, the flow of hydraulic fluid from the fifth liquid chamber 576 to the fourth liquid chamber 572 is blocked and the fourth liquid chamber 572 By allowing the flow of hydraulic fluid to the one liquid chamber 548 and the like, the increased adjustment pressure can be reduced.

  More specifically, when no current is supplied to the coil 506, the projecting portion 568 of the first moving member 566 is seated in the downward opening of the partition member 514 by the elastic force of the coil spring 574, and the fifth The flow of hydraulic fluid between the liquid chamber 576 and the fourth liquid chamber 572 is blocked. Further, the tip of the plunger 504 is separated from the downward opening of the internal communication path 584 of the second moving member 578 by the elastic force of the coil spring 586, and between the fourth liquid chamber 572 and the first liquid chamber 548 and the like. The flow of hydraulic fluid is allowed. For this reason, the adjustment pressure is atmospheric pressure.

  When a current is supplied to the coil 506, an electromagnetic force is generated that moves the plunger 504 in a direction in which the tip of the plunger 504 approaches the opening of the internal communication path 584. By this electromagnetic force, the plunger 504 first moves upward against the elastic force of the coil spring 586, and the tip of the plunger 504 is seated on the opening of the internal communication path 584. In this state, the flow of hydraulic fluid between the fourth liquid chamber 572 and the first liquid chamber 548 is interrupted, and the flow of hydraulic fluid between the fifth liquid chamber 576 and the fourth liquid chamber 572 is also blocked. Blocked. When the tip of the plunger 504 is seated in the opening, that is, when the plunger 504 is in contact with the second moving member 578, the second moving member 578 is also moved upward. As the second moving member 578 moves upward, a portion of the rubber reaction disk 560 that is in contact with the second moving member 578 is deformed upward, and the reaction disk 560 is interlocked with the deformation. The portion in contact with the first moving member 566 is deformed downward. As the first moving member 566 moves downward, the protruding portion 568 of the first moving member 566 separates from the downward opening of the partition member 514, so that the fifth liquid chamber 576 and the fourth liquid chamber. The flow of hydraulic fluid to and from 572 is allowed. Thus, by adjusting the power to the coil 506, the adjustment pressure can be increased controllably.

  Further, if the supply amount of electric power to the coil 506 is reduced after the adjustment pressure is increased, the protrusion 568 of the first moving member 566 is seated in the downward opening of the partition member 514 and the plunger 504 The tip is seated in the opening of the internal communication path 584. Therefore, the adjustment pressure is maintained at the pressure in that state. If the amount of power supplied to the coil 506 is further reduced from that state, the tip of the plunger 504 is separated from the opening of the internal communication path 584, and the space between the first liquid chamber 548 and the fourth liquid chamber 572 is increased. Hydraulic fluid flow is allowed. That is, by adjusting the power to the coil 506, the adjustment pressure can be controlled to be decreased.

  When electric power is not supplied to the hydraulic pressure adjusting device 501, the hydraulic fluid pressurized by the operation of the master cylinder device 110 passes through the second fluid chamber 556 via the communication passage 458 that is a pilot pressure channel. Flow into. Therefore, the partition member 514 moves downward when the force pushing the partition member 514 downward due to the pressure of the hydraulic fluid in the second liquid chamber 556 becomes larger than the force pushing the partition member 514 upward due to the adjustment pressure. . As the partition member 514 moves downward, the first moving member 566, the second moving member 578, and the reaction disk 560 move downward. First, the opening below the internal communication path 584 of the second moving member 578 is opened. Then, the tip of the plunger 504 is seated. In this state, the flow of hydraulic fluid between the first liquid chamber 548 and the like and the fourth liquid chamber 572 is blocked. When the partition member 514 moves further downward, the first moving member 566 and the reaction disk 560 are moved downward, but the second moving member 578 is movable downward because it is in contact with the plunger 504. First, the part of the reaction disk 560 in contact with the second moving member 578 is deformed. With the deformation of the reaction disk 560, the first moving member 566 is further moved downward, and the protruding portion 568 of the first moving member 566 is separated from the downward opening of the partition member 514, so that the fifth liquid The flow of hydraulic fluid between the chamber 576 and the fourth liquid chamber 572 is allowed. As described above, the hydraulic pressure adjusting device 501 operates the fourth liquid chamber 572 according to the pressure of the hydraulic fluid introduced to itself as a pilot pressure even when power is not supplied thereto. It has a pilot pressure-dependent pressure adjusting function for adjusting the pressure of the liquid.

In the hydraulic pressure adjusting device 501 that operates in this way, the tip of the plunger 504 is seated in the opening below the internal communication path 584 of the second moving member 578, while the protruding portion 568 of the first moving member 566 has the partition member 514. When it is in the state of being seated in the downward opening, the adjustment pressure is maintained at the magnitude in that state. In this state, the partition member 514 is stopped. The force acting on the partition member 514 in this state will be described in detail. The force that pushes the partition member 514 downward by the pilot pressure and the force that pushes the partition member 514 upward by the adjustment pressure are maintained in a balanced state. It becomes. That is, if the pressure receiving area that acts on the partition member 514 of the pilot pressure P _P and A _5, the force pushing the partitioning member 514 downward, the A ₅ × P _P. On the other hand, if the pressure receiving area that acts on the partition member 514 of the adjusting pressure P _C and A _6, the force pushing the partitioning member 514 upward, the A ₆ × P _C. The pressure receiving areas A ₅ and A ₆ are the cross-sectional area of the small-diameter portion 552 and the cross-sectional area of the large-diameter portion 550 of the partition member 514, respectively. Assuming that the force generated by the compression coil springs 554 and 574 is negligibly small compared to these forces, the adjusted pressure P _C is maintained in a state of A ₅ × P _P = A ₆ × P _C. It will be. Therefore, the adjustment pressure P _C is calculated by A ₅ / A ₆ × P _P. That is, the area ratio of the pressure receiving area A ₆ acting on the pressure receiving area A ₅ and the adjusting pressure P _C of the pressing member 386 acting on the partitioning member 514 of the pilot pressure P _P is set for the pilot pressure P _P of the adjusting pressure P _C The adjustment pressure P _C is adjusted to a pressure that is a set ratio with respect to the pilot pressure P _P. This setting ratio is the same as the setting ratio of the pressure regulating valve device 374 in the hydraulic braking system 100 of the first embodiment.

≪Hydraulic braking system diagnosis≫
In the hydraulic braking system 500 that operates as described above, the brake ECU 48 controls the operation of the hydraulic braking system 500 as in the hydraulic braking system 100 of the first embodiment. The hydraulic braking system diagnosis of the present embodiment is also performed in the same manner as the hydraulic braking system 100 of the first embodiment. However, the hydraulic pressure adjusting device 501 of the hydraulic braking system 500 has a structure that allows backflow to the reservoir 122 when power is not supplied thereto. That is, in the hydraulic pressure adjusting device 120 of the hydraulic braking system 100 of the first embodiment, the hydraulic fluid can be contained in the second pressure regulating flow path by closing the pressure increasing linear valve 370 and the pressure reducing linear valve 372. Although it was set as the structure which can be performed, this liquid pressure adjusting device 501 is not set as such a structure. Therefore, during the execution of the second regulating fluid path blocking diagnostic process, as adjusted pressure P _C is the first shut-off diagnosis target pressure P _T3, the supply of power to the fluid pressure adjusting device 501 is continued. That is, the fluid pressure adjusting device 501, so that the adjusted pressure P _C continues to operate so as to maintain the first shut-off diagnosis target pressure P _T3.

In the hydraulic pressure adjusting device 501 that operates as described above, when the leakage due to the abnormal shutoff of the second pressure regulating flow path is small, the regulating pressure P _C is the first shutoff when the pressure reducing on-off valve 172 is opened. Even if the pressure drops from the diagnostic target pressure P _{T3, the} pressure immediately returns to the first cutoff diagnostic target pressure P _T3 . Even if such a leak is small, the second pressure regulation flow path shutoff abnormality diagnosis process of the hydraulic braking system 500 is performed due to a slight drop in the adjustment pressure after the pressure reducing on-off valve 172 is opened. Diagnose. Therefore, in the second regulating fluid path blocking abnormality diagnosis processing of the liquid pressure braking system 500, the second adjusting pressure passage blocking diagnosis pressure P _C3 is a reference pressure which is set below the first cut-off diagnosis target pressure P _T3 is, This is set with a margin in consideration of this.

  The hardware configuration of the hydraulic braking system 700 according to the present embodiment is substantially the same as that of the previous hydraulic braking system 100 except for the hydraulic pressure adjusting device. FIG. 14 shows a connected liquid passage and the like, and the drawing of the entire system and its description are omitted.

≪Configuration of hydraulic pressure adjustment device≫
The hydraulic pressure adjusting device 702 includes a pressure adjusting valve device 704 that adjusts the hydraulic fluid to an adjusted pressure according to the pressure of the hydraulic fluid introduced into the hydraulic pressure adjusting device 702, a pressure increasing linear valve 704 connected to the high pressure source device 118, and the reservoir 122. And a pressure-reducing linear valve 706 connected thereto. The pressure regulating valve device 704 is connected to the pressure-increasing linear valve 704 and the pressure-reducing linear valve 706, and the hydraulic fluid adjusted to the pressure by the pressure-increasing linear valve 704 and the pressure-reducing linear valve 706 is supplied to the master cylinder. It can be supplied to the supply liquid chamber R3 of the device 110 and the brake device 116.

  As shown in FIG. 2, the pressure regulating valve device 704 includes a hollow housing 710, a plunger 712 provided in the housing 710 so as to be movable in the axial direction thereof, and an axial movement below the plunger 712. A cylindrical rod-shaped piston 714 provided in a possible manner and a moving member 716 provided above the plunger 712 so as to be movable in the axial direction are provided. The housing 710 includes a generally cylindrical outer shell member 718, a bottomed cylindrical member 720 to which a lower end portion of the outer shell member 718 is fixedly fitted, and a lid member 722 that closes the upper end of the outer shell member 718. And has a working fluid filled therein.

  The inner peripheral surface of the outer shell member 718 is constituted by inner diameter portions having five different inner diameters, and the inner diameter increases toward the upper side. That is, in order from the lower end, the first inner diameter portion 724 having the smallest inner diameter, the second inner diameter portion 726 having an inner diameter larger than the inner diameter of the first inner diameter portion 724, and the third inner diameter larger than the inner diameter of the second inner diameter portion 726. An inner diameter portion 728, a fourth inner diameter portion 730 having an inner diameter larger than the inner diameter of the third inner diameter portion 728, and a fifth inner diameter portion 732 having the largest inner diameter are located, and the inner peripheral surface of the outer shell member 718 has a stepped shape. Has been.

  The outer peripheral surface of the rod-shaped piston 714 is also stepped, and is divided into a large-diameter portion 734 that is located at the upper end and has a large outer diameter, and a small-diameter portion 736 that is located at the lower end and has a small outer diameter. The small diameter portion 736 of the rod-like piston 714 is slidably fitted to the first inner diameter portion 724 of the outer shell member 718, and the large diameter portion 734 is slidably fitted to the second inner diameter portion 726. . The step surface between the large diameter portion 734 and the small diameter portion 736 and the step surface between the first inner diameter portion 724 and the second inner diameter portion 726 are in contact with each other, and the downward movement range of the rod-shaped piston 714 is small. Limited. The first liquid chamber 738 is defined by the outer shell member 718, the rod-like piston 714, and the bottomed cylindrical member 720 in a state where the rod-like piston 714 is fitted to the outer shell member 718.

  The plunger 712 includes a cylindrical main body 740, an intermediate portion 742 having an outer diameter smaller than the outer diameter of the main body 740, and an intermediate portion 742 positioned above the intermediate portion 742. And a rod portion 744 having an outer diameter smaller than the outer diameter. A main body portion 740 of the plunger 712 is slidably fitted to the second inner diameter portion 726 of the outer shell member 718, and a convex portion 746 having a lower end surface of the main body portion 740 formed on an upper end surface of the rod-like piston 714 and It is in contact. Even in a state where the convex portion 746 and the lower end surface of the main body portion 740 are in contact with each other, a clearance exists between the lower end surface of the main body portion 740 and the upper end surface of the rod-shaped piston 714, and the clearance serves as the second liquid chamber 748. It is functioning.

  The outer peripheral surface of the moving member 716 has a stepped shape, the flange portion 750 having the largest outer diameter, and the upper first outer diameter portion located above the flange portion 750 and having an outer diameter smaller than the outer diameter of the flange portion 750. 752, an upper second outer diameter portion 754 having an outer diameter smaller than the outer diameter of the upper first outer diameter portion 752 above the first outer diameter portion 752, and a flange portion positioned below the flange portion 750. A lower first outer diameter portion 756 having an outer diameter smaller than the outer diameter of 750, and a lower second outer portion having an outer diameter smaller than the outer diameter of the lower first outer diameter portion 756 located below the lower first outer diameter portion 756. And a diameter portion 758. The lower second outer diameter portion 758 is slidably fitted to the third inner diameter portion 728 of the outer shell member 718, and a moving member is disposed at the opening above the third inner diameter portion 728 as the second chamber portion. The outer peripheral surface of 716 can be seated. More specifically, the step surface 760 between the third inner diameter portion 728 and the fourth inner diameter portion 730 is tapered, and the step between the lower first outer diameter portion 756 and the lower second outer diameter portion 758 is formed. The surface functions as a valve body and can be seated on the stepped surface 760 having a tapered shape.

  A concave portion 770 is formed on the lower surface of the lid member 722 fixedly fitted to the upper end of the housing 710, and the upper second outer diameter portion 754 of the moving member 716 slides in the opening below the concave portion 770. It can be fitted. A coil spring 772 is disposed in a compressed state between the lower surface of the lid member 722 and the flange portion 750 of the moving member 716, and the moving member 716 is biased downward by the elastic force of the coil spring 772. ing. That is, due to the elastic force of the coil spring 772, the moving member 716 is attached in a direction in which a portion functioning as a valve body on the outer peripheral surface of the moving member 716 approaches the stepped surface 760 formed on the inner peripheral surface of the outer shell member 718. It is energized. Incidentally, the third liquid chamber 774 is defined by the fourth inner diameter portion 730 of the outer shell member 718 and the moving member 716 when the outer peripheral surface of the moving member 716 is seated on the stepped surface 760. In addition, the outer peripheral surface of the lower second outer diameter portion 758 of the moving member 716 is slightly recessed, and the recessed portion of the outer peripheral surface of the lower second outer diameter portion 758 and the third inner diameter of the outer shell member 718 in the seated state. A fourth liquid chamber 776 is defined by the portion 728.

  A through hole 780 that penetrates in the axial direction of the moving member 716 is formed inside the moving member 716, and the through hole 780 opens at the upper end surface and the lower end surface of the moving member 716. Inside the moving member 716, a connection hole 782 that opens to the outer peripheral surface of the lower first outer diameter portion 756 and the through hole 780 is formed so as to extend in the radial direction. A generally cylindrical pin 262 is slidably inserted into the through hole 780 from the opening at the upper end thereof, and the upper end surface of the pin 784 is supported on the inner surface of the recess 770 of the lid member 722. An annular rubber member 786 is provided inside the recess 770 of the lid member 722 with the pin 784 penetrated, and the upper end surface of the moving member 716 is in close contact with the lower surface of the rubber member 786. The rubber member 786 functions as a seal, and liquid leakage between the moving member 716 and the lid member 722 is prohibited by the rubber member 786.

  The rod portion 744 and the intermediate portion 742 of the plunger 712 are inserted into the through hole 780 from the opening at the lower end thereof, and the outer peripheral surface of the plunger 712 can be seated in the opening at the lower end of the through hole 780. . More specifically, the opening at the lower end of the through hole 780 is tapered, and the step surface between the intermediate portion 742 and the main body portion 740 of the plunger 712 functions as a valve body, and the tapered opening. It can be seated. A coil spring 790 is compressed between the step surface between the rod portion 744 and the intermediate portion 742 of the plunger 712 and the step surface formed inside the through hole 780. The plunger 712 is biased downward by the elastic force of the coil spring 790. That is, due to the elastic force of the coil spring 790, the plunger 712 is biased in a direction in which a portion functioning as a valve body on the outer peripheral surface of the plunger 712 is separated from the opening at the lower end of the through hole 780. Incidentally, in a state where the plunger 712 is seated in the opening at the lower end of the through hole 780 against the elastic force of the coil spring 790, the third inner diameter portion 728 of the outer shell member 718, the main body portion 740 of the plunger 712, and the moving member 716 A fifth liquid chamber 792 is defined by the lower end surface.

  A first communication passage 794 that opens to the fourth liquid chamber 776 and the outer peripheral surface of the outer shell member 718 is formed in the third inner diameter portion 728 of the outer shell member 718 so as to extend in the radial direction. A liquid passage communicating with the high-pressure source device 118 is connected to the opening to the outer peripheral surface of the communication passage 794. That is, the fourth liquid chamber 776 is supplied with hydraulic fluid that has been made high pressure by the high pressure source device 118 through the liquid passage. Further, the third inner diameter portion 728 of the outer shell member 718 is formed with a second communication passage 796 that opens to the fifth liquid chamber 792 and the outer peripheral surface of the outer shell member 718 so as to extend in the radial direction. A communication path communicating with the reservoir 122 is connected to the opening to the outer peripheral surface of the second communication path 796. That is, the fifth liquid chamber 792 is configured to allow the working fluid to flow out to the reservoir 122 through the communication path. Incidentally, the lower second outer diameter portion 758 of the moving member 716 is fitted to the third inner diameter portion 728, so that the flow of hydraulic fluid between the fifth liquid chamber 792 and the fourth liquid chamber 776 is blocked. Yes. The second communication passage 796 is connected to a drain passage 798 that opens to the first inner diameter portion 724 of the outer shell member 718.

  In the second inner diameter portion 726 of the outer shell member 718, a third communication path 800 that opens to the second liquid chamber 748 and the outer peripheral surface of the outer shell member 718 is formed to extend in the radial direction. A fluid passage connected to an electromagnetic pressure-increasing linear valve 704 that is a normally closed valve is connected to an opening to the outer peripheral surface of the communication passage 800. Further, the liquid passage is branched, and the branched liquid passage is connected to an electromagnetic pressure-reducing linear valve 706 that is a normally open valve.

  A fourth communication passage 802 that opens to the third liquid chamber 774 and the outer peripheral surface of the outer shell member 718 is formed in the fourth inner diameter portion 730 of the outer shell member 718 so as to extend in the radial direction. A communication path 456 that is a first pressure regulation flow path is connected to an opening to the outer peripheral surface of the communication path 802. The bottomed cylindrical member 720 is formed with a port 804 that opens to the first liquid chamber 738, and a communication passage 458 that is a pilot pressure flow path is connected through the port 804.

≪Operation of hydraulic pressure adjustment device≫
With the above-described structure, the pressure regulating valve device 704 allows the working fluid to flow between the fluid chambers in accordance with the pressure of the working fluid supplied to the second fluid chamber 748 (hereinafter sometimes referred to as “control fluid pressure”). By switching the state, it is possible to adjust the pressure of the hydraulic fluid in the third liquid chamber 774 and supply the adjusted hydraulic fluid to the communication path 456. The control hydraulic pressure is increased or decreased by controlling the power to the pressure increasing linear valve 704 and the pressure reducing linear valve 706. More specifically, in a state where power is not supplied to the pressure increasing linear valve 704 and the pressure reducing linear valve 706, the pressure increasing linear valve 704 is closed and the pressure reducing linear valve 706 is opened. The hydraulic pressure for control becomes atmospheric pressure. Then, the maximum current in the range set in the pressure-reducing linear valve 706 is supplied, and the power to the pressure-increasing linear valve 704 is controlled, whereby the pressure-increasing linear valve 704 is closed. The valve opening amount is controlled. At this time, the control hydraulic pressure is increased according to the electric power to the pressure increasing linear valve 704. If the power to the pressure-reducing linear valve 706 is controlled without supplying power to the pressure-increasing linear valve 704 after the control hydraulic pressure is increased, the pressure-increasing linear valve 704 is closed. The valve opening amount of the pressure reducing linear valve 706 is controlled. At this time, the control hydraulic pressure is decreased according to the electric power to the pressure-reducing linear valve 706.

  As described above, when the control hydraulic pressure is increased, the plunger 712 is biased upward. That is, as the control hydraulic pressure increases, a force is applied to the plunger 712 in a direction that causes the plunger 712 to approach the opening at the lower end of the through hole 780 (hereinafter sometimes referred to as “fifth liquid chamber side opening”). It is. By this force, first, the plunger 712 moves upward against the elastic force of the coil spring 790, and the outer peripheral surface of the plunger 712 is seated on the fifth liquid chamber side opening. In this state, the flow of hydraulic fluid between the third liquid chamber 774 and the fifth liquid chamber 792 is cut off, and the flow of hydraulic fluid between the fourth liquid chamber 776 and the third liquid chamber 774 is also cut off. Has been. When the plunger 712 moves upward with the outer peripheral surface of the plunger 712 seated on the fifth liquid chamber side opening, the moving member 716 also moves upward. When the moving member 716 moves upward, the outer peripheral surface of the moving member 716 is separated from the step surface 760 formed on the outer shell member 718, and the flow of hydraulic fluid from the fourth liquid chamber 776 to the third liquid chamber 774 is allowed. And the adjustment pressure is increased. In this way, the adjustment pressure can be increased controllably by controlling the control hydraulic pressure. That is, the adjustment pressure can be increased according to the electric power to the pressure increasing linear valve 704.

  Further, after the adjustment pressure is increased, when the pressure increasing linear valve 704 is closed and the valve opening amount of the pressure reducing linear valve 706 is controlled, the control hydraulic pressure is decreased and the plunger 712 is moved to the fifth position. The outer peripheral surface of the moving member 716 is seated on the step surface 760 in a state of being seated in the liquid chamber side opening. Therefore, the adjustment pressure is maintained at the pressure in that state. When the control hydraulic pressure is further reduced, the plunger 712 is separated from the fifth liquid chamber side opening, the flow of hydraulic fluid from the third liquid chamber 774 to the fifth liquid chamber 792 is allowed, and the adjustment pressure is increased. Will be reduced. That is, the adjustment pressure can be reduced according to the power to the pressure reducing linear valve 706.

  Further, in the hydraulic pressure adjusting device 702, when power is not supplied to the pressure-increasing linear valve 704 and the pressure-decreasing linear valve 706, the pressure is increased by the operation of the master cylinder device 110 without depending on the power. The adjustment pressure is increased or decreased depending on the hydraulic fluid. More specifically, when electric power is not supplied to the hydraulic braking system 700, the hydraulic fluid pressurized by the operation of the master cylinder device 110 passes through the first fluid via the communication passage 458 that is a pilot pressure channel. Supplied to chamber 738. For this reason, as the pressure of the hydraulic fluid in the first liquid chamber 738, that is, the pilot pressure increases, the rod-like piston 714 moves upward, and the plunger 712 also moves upward by the rod-like piston 714. Therefore, as described above, with the upward movement of the plunger 712, the flow of hydraulic fluid from the fourth liquid chamber 776 to the third liquid chamber 774 is allowed, and the adjustment pressure is increased. If the pilot pressure decreases, the rod-like piston 714 moves downward and the plunger 712 also moves downward. Therefore, as described above, the flow of hydraulic fluid from the third liquid chamber 774 to the fifth liquid chamber 792 is allowed, and the adjustment pressure is reduced. Thus, even if the pressure regulating valve device 704 is not supplied with power to the pressure-increasing linear valve 704 and the pressure-decreasing linear valve 706, the pressure-regulating valve device 704 adjusts the pressure of the hydraulic fluid introduced to itself as a pilot pressure. Accordingly, it has a pilot pressure dependent pressure regulating function for regulating the hydraulic fluid in the third fluid chamber 774.

In the hydraulic pressure adjusting device 501 that operates in this way, the outer peripheral surface of the plunger 712 is seated on the fifth liquid chamber side opening, while the outer peripheral surface of the moving member 716 is seated on the step surface 760 formed on the outer shell member 718. In this state, the adjustment pressure is maintained at the magnitude in that state. In this state, the moving member 716 is stopped. The force acting on the moving member 716 in this state will be described in detail. The force that pushes the moving member 716 upward by the pilot pressure and the force that pushes the moving member 716 downward by the adjustment pressure are maintained in a balanced state. It becomes. The force that pushes the moving member 716 upward is the force that the rod-like piston 714 transmits to the moving member 716 via the plunger 712. That is, if the pressure-receiving area that acts on the rod-shaped piston 714 of the pilot pressure P _P and A _7, the force pushing the rod-like piston 714 upward, the A ₇ × P _P. On the other hand, if the pressure receiving area that acts on the moving member 716 of the adjusting pressure P _C and A _8, a force that pushes the moving member 716 downward, the A ₈ × P _C. The pressure receiving area A ₇ is a cross-sectional area of the small diameter portion 736 of the rod-shaped piston 714, and the pressure receiving area A ₈ is an area where a differential pressure between the third liquid chamber 774 and the fifth liquid chamber 792 is received. Assuming that the forces generated by the compression coil springs 772 and 790 are negligibly small compared to these forces, the adjusted pressure P _C is maintained in a state where A ₇ × P _P = A ₈ × P _C. It will be. Therefore, the adjustment pressure P _C is calculated by A ₇ / A ₈ × P _P. That is, the area ratio of the pressure receiving area A ₈ which acts on the moving member 716 of the pressure receiving area A ₇ adjusted pressure P _C which acts on the rod-like piston 714 of the pilot pressure P _P is set for the pilot pressure P _P of the adjusting pressure P _C The adjustment pressure P _C is adjusted to a pressure that is a set ratio with respect to the pilot pressure P _P. This set ratio is the same as the set ratio of the pressure regulating valve device 374 in the hydraulic braking system 100 of the first embodiment.

≪Hydraulic braking system diagnosis≫
In the hydraulic braking system 700 that operates as described above, the brake ECU 48 controls the operation of the hydraulic braking system 700 as in the hydraulic braking system 500 of the second embodiment. In addition, the hydraulic braking system 700 can execute the same hydraulic braking system diagnosis as the hydraulic braking system diagnosis of the second embodiment.

48: Brake ECU (control device) 100: Hydraulic braking system 110: Master cylinder device 116: Brake device 118: High pressure source device 120: Hydraulic pressure adjustment device 122: Reservoir (low pressure source) 140: Brake pedal (operation member) 170 : On-off valve for pressure increase (second pressure regulating flow path circuit breaker) 172: On-off valve for pressure reduction (low pressure source flow path circuit breaker) 442: Liquid passage (master pressure flow path) 444: Liquid passage (master pressure flow path) 446: Opening and closing for master Valve (master pressure channel circuit breaker) 448: Master on-off valve (master pressure channel circuit breaker) 456: Communication channel (first pressure regulation channel) 458: Communication channel (pilot pressure channel) 460: Communication channel (second pressure regulation flow) 462: Decompression communication path (low pressure source flow path) 480: Operation mode switching processing section (operation control section) 482: Abnormality diagnosis section 500: Hydraulic braking system 501: Hydraulic pressure Integer unit 700: hydraulic braking system 702: the hydraulic adjusting device P _T2: pilot pressure dependent pressure regulating function diagnosis target pressure (first set pressure) P _T3: first shut-off diagnosis target pressure (second set pressure) P _T4: Second cutoff diagnosis target pressure (third set pressure)

Claims (10)

A hydraulic braking system that generates a braking force by the pressure of hydraulic fluid,
An operation member operated by a driver;
A master cylinder device that pressurizes the hydraulic fluid by the operating force applied to the operating member and the pressure of the hydraulic fluid supplied to the operating member;
A brake device that is provided on the wheel and generates a braking force corresponding to the pressure supplied to the wheel; a high-pressure source device that generates high-pressure hydraulic fluid;
The pressure from the high-pressure source device is adjusted according to the electric power supplied to itself, and even in a state where no electric power is supplied to itself, the pressure is adjusted according to the pressure of the hydraulic fluid introduced to itself as a pilot pressure. A hydraulic pressure adjusting device having a pilot pressure dependent pressure regulating function,
A first pressure regulating flow path for supplying the regulated hydraulic fluid from the fluid pressure regulating device to the master cylinder device;
A second pressure regulation channel for communicating the first pressure regulation channel and supplying the hydraulic fluid regulated from the fluid pressure regulation device to the brake device;
A master pressure channel for supplying hydraulic fluid pressurized by the master cylinder device from the master cylinder device to the brake device;
A second pressure regulating flow path breaker provided in the second pressure regulating flow path for blocking the second pressure regulating flow path;
A master pressure flow path breaker provided in the master pressure flow path for blocking the master pressure flow path;
A pilot pressure flow path for introducing the pressure of the hydraulic fluid supplied to the brake device as the pilot pressure into the hydraulic pressure adjusting device;
A control device for controlling the power supplied to the hydraulic pressure adjusting device and the operation of the second pressure regulating flow path breaker and the master pressure flow path breaker;
The control unit is
(a) The hydraulic fluid whose pressure is adjusted according to the electric power by controlling the electric power supplied to the hydraulic pressure adjusting device while cutting off the master pressure channel by the master pressure channel circuit breaker. Realizing a pressure regulation dependent braking force generation state, which is a state of generating a braking force depending on the pressure of the pressure, and (b) shutting off the second pressure regulation channel by the second pressure regulation channel circuit breaker. Even when power supply to the pressure adjusting device is cut off, the pressure of the hydraulic fluid adjusted by the brake device according to the operating force and the pilot pressure by the pressure of the hydraulic fluid from the master cylinder device And an operation control unit that realizes an operation force / pressure regulation dependent braking force generation state that is a state that generates a braking force that depends on both,
An abnormality diagnosing unit that performs diagnosis on abnormality of the hydraulic braking system,
The abnormality diagnosis part
In the state in which the master pressure channel and the second pressure regulation channel are respectively blocked by the master pressure channel circuit breaker and the second pressure regulation channel circuit breaker, and the hydraulic fluid of the first set pressure is contained in the brake device, Abnormality in the pilot pressure-dependent pressure adjusting function of the hydraulic pressure adjusting device based on the pressure of the hydraulic fluid adjusted by the hydraulic pressure adjusting device when the supply of power to the hydraulic pressure adjusting device is stopped A hydraulic braking system having a pilot pressure-dependent pressure regulation function diagnostic unit for diagnosing the pressure. The pilot pressure-dependent pressure regulation function diagnostic unit is
By supplying electric power to the hydraulic pressure adjusting device in a state where the master pressure flow channel is interrupted by the master pressure flow circuit breaker, the hydraulic fluid having the first set pressure is supplied to the brake device via the second pressure regulating flow channel. 2. The apparatus according to claim 1, wherein the second pressure regulating flow path breaker is cut off by the second pressure regulating flow path breaker to contain the hydraulic fluid having the first set pressure in the brake device. Hydraulic braking system. The pilot pressure-dependent pressure adjusting function of the hydraulic pressure adjusting device is a function of adjusting the pressure of the hydraulic fluid from the high pressure source device to a pressure having a set ratio with respect to the pilot pressure,
The pilot pressure-dependent pressure regulation function diagnostic unit is
When the supply of electric power to the hydraulic pressure adjusting device is prohibited, the pressure of the hydraulic fluid adjusted by the hydraulic pressure adjusting device is set to a pressure set to be equal to or lower than the pressure that is the set ratio with respect to the first set pressure. 3. The hydraulic braking system according to claim 1, wherein the hydraulic pressure braking system is configured to diagnose that the pilot pressure-dependent pressure regulation function is abnormal when not reached.   4. The apparatus according to claim 1, wherein the abnormality diagnosing unit includes a second pressure regulation flow path interruption abnormality diagnosis unit that diagnoses an interruption of the second pressure regulation flow path by the second pressure regulation flow path breaker. 5. The hydraulic braking system described in 1. The second pressure regulation flow path cutoff abnormality diagnosis unit is
5. The liquid according to claim 4, wherein the liquid is configured to diagnose an abnormality in blocking the second pressure regulation flow path by the second pressure regulation flow path breaker in a state where the master pressure flow path breaker is blocked by the master pressure flow path breaker. Pressure braking system. A low-pressure source passage for guiding the hydraulic fluid of the brake device to a low-pressure source, and a low-pressure source passage breaker that shuts off the low-pressure source passage when the hydraulic fluid is supplied to the brake device. With
The second pressure regulation flow path cutoff abnormality diagnosis unit is
Supplying a hydraulic fluid having a second set pressure to the second pressure regulating channel by supplying electric power to the hydraulic pressure adjusting device in a state in which the second pressure regulating channel is interrupted by the second pressure regulating channel circuit breaker; Thereafter, the blocking of the low pressure source flow path by the low pressure source flow path breaker is released, and the second pressure regulating flow path is based on the actual pressure of the hydraulic fluid supplied to the second pressure regulating flow path at that time. The hydraulic braking system according to claim 5, wherein the hydraulic braking system is configured to diagnose an abnormal shutoff of the second pressure regulation flow path by a circuit breaker. The second pressure regulation flow path cutoff abnormality diagnosis unit is
The actual pressure of the hydraulic fluid supplied to the second pressure regulation flow path when the low pressure source flow path breaker is released from being shut off by the low pressure source flow path breaker is lower than the pressure set to the second set pressure or lower. The hydraulic braking system according to claim 6, configured to diagnose that the interruption of the second pressure regulation flow path by the second pressure regulation flow path breaker is abnormal. The second pressure regulation flow path cutoff abnormality diagnosis unit is
By supplying electric power to the hydraulic pressure adjusting device, the hydraulic fluid having the second set pressure is supplied to the brake device via the second pressure adjusting flow path, and then the second pressure adjusting flow path breaker is used to supply the second hydraulic pressure. The electric power supplied to the hydraulic pressure adjusting device is increased so as to block the pressure adjusting flow path and increase the pressure of the hydraulic fluid to a third set pressure higher than the second set pressure, and the second pressure adjusting flow path at that time is increased. 6. The hydraulic braking system according to claim 5, wherein the hydraulic pressure braking system is configured to diagnose an abnormal shutoff of the second pressure regulation flow path by the second pressure regulation flow path breaker based on an actual pressure of the supplied hydraulic fluid. . The second pressure regulation flow path cutoff abnormality diagnosis unit is
When the actual pressure of the hydraulic fluid supplied to the second pressure regulation flow path does not reach the pressure set to the third set pressure or less when the power supplied to the hydraulic pressure adjusting device is increased. The hydraulic braking system according to claim 8, wherein the hydraulic pressure braking system is configured to diagnose that the interruption of the second pressure regulation flow path by the second pressure regulation flow path breaker is abnormal.
The pilot pressure-dependent pressure regulation function diagnostic unit is
The pilot pressure-dependent pressure regulation function is abnormal on the condition that the second pressure regulation flow path interruption abnormality diagnosis unit diagnoses that the second pressure regulation flow path breaker is not abnormally blocked by the second pressure regulation flow path breaker. 10. The hydraulic braking system according to any one of claims 4 to 9, wherein the hydraulic braking system is configured to diagnose that.

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