JP3204016B2 - Parking brake safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking brake safety device provided to secure the safety of a parked vehicle.

[0002]

2. Description of the Related Art Conventionally, in vehicles such as automobiles, brake assist devices have been developed which can reduce the troublesome operation of a driver to brake. Such a conventional brake assist device is a device in which a computer detects when the vehicle stops due to a brake operation, and holds the brake fluid pressure when the brake pedal is depressed even when the driver releases his / her foot from the brake pedal. This allows the driver to keep the vehicle stationary without continuing to depress the brake pedal. When the driver puts the clutch in the engaged state, the operation of the above-described brake assist device is released, and normal traveling can be performed.

A specific description of such a device is as follows. For example, an actuator is provided on a hydraulic oil supply path of a brake of a vehicle so as to maintain a brake fluid pressure, and the vehicle stops when a brake pedal is depressed. When the brake pedal is released for a predetermined time and then released, the computer detects this and supplies air pressure or the like to the actuator to maintain the braking force.

[0004] This eliminates the need to continue to depress the brake pedal during traffic congestion or signal waiting, thereby reducing physical and mental fatigue. In addition, the vehicle can easily start on a slope and the like, and furthermore, when a rear-end collision occurs, the damage can be minimized and the accident can be prevented from spreading. Also, JP-A-63-2582
No. 47 discloses a braking force holding device as an example of the above-described brake assist device.

[0005]

However, such a conventional brake assist device is configured to keep the brake fluid pressure constant during operation. For example, a vehicle parked on a slope or the like starts to move. In this case, the vehicle was not stopped by actively increasing the brake fluid pressure.

Therefore, an actuator is provided in the brake oil supply system of the vehicle so as to adjust the brake fluid pressure.
Based on detection information from various sensors such as a vehicle speed sensor, the parking brake safety system is configured such that when it is determined that the parked vehicle has started moving, the controller controls the operation of the brake actuator to actively stop the vehicle. It is conceivable to provide a device.

[0007] In such a parking brake safety device, some means for releasing the operation of the device is required. If the driver unconsciously releases the brake, the driver may recognize that the brake device is operating even though the brake device is not operating during parking.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and when a parking brake safety device is released, the driver is made to fully recognize the release operation. The purpose is to provide.

[0009]

According to the present invention, there is provided a parking brake safety device according to the present invention, in a vehicle equipped with a parking brake, a service brake having wheels provided in response to operation of a service brake operating member. A brake working fluid supply system for supplying a brake working fluid at a required pressure to the working member, and a brake working fluid supply system interposed therebetween for increasing a fluid pressure of a service brake working member side portion in the brake working fluid supply system. A first control means for controlling the fluid pressure increasing mechanism so as to increase the fluid pressure of a service brake actuating member side portion of the brake working fluid supply system under required conditions. And a parking brake operating member operating state detecting means for detecting an operating state of the parking brake operating member; By the control means, in a state in which it increased fluid pressure in the service brake actuating member side portion,
When the parking brake operating member operating state detecting means detects that the parking brake operating member has performed a plurality of parking brake releasing operations, the hydraulic pressure of the service brake operating member side portion in the brake operating fluid supply system is increased. A second controlling the fluid pressure increasing mechanism to reduce
Control means is provided.

According to a second aspect of the present invention, there is provided a parking brake safety device for a vehicle equipped with a parking brake.
In a vehicle equipped with a parking brake, a brake working fluid supply system that supplies a brake working fluid of a required pressure to a service brake working member with wheels in response to operation of a service brake operating member; A fluid pressure increasing mechanism interposed to increase the fluid pressure of the service brake actuating member side portion of the brake actuating fluid supply system, and a service brake actuation in the brake actuating fluid supply system under required conditions. First control means for controlling the fluid pressure increasing mechanism is provided so as to increase the fluid pressure of the member side portion, and a parking brake operating member operating state detecting means for detecting an operating state of the parking brake operating member; Service brake operating member operating state detecting means for detecting an operating state of the service brake operating member; At said first control means, in a state in which increased fluid pressure in the service brake actuating member side portion at said parking brake operating member operation state detection means,
When the parking brake operating member detects that the parking brake releasing operation has been performed, and the service brake operating member operating state detecting means detects that the service brake operating member has performed the service brake operating operation, Second control means for controlling the fluid pressure increasing mechanism is provided so as to reduce the fluid pressure at the service brake actuating member side portion in the brake actuating fluid supply system.

According to a third aspect of the present invention, there is provided a parking brake safety device for a vehicle equipped with a parking brake.
In response to the operation of the service brake operating member, a brake working fluid supply system that supplies a brake working fluid of a required pressure to a service brake operating member with wheels, and a brake working fluid supply system that is interposed in the brake working fluid supply system to perform the brake operation A fluid pressure increasing mechanism capable of increasing the fluid pressure of the service brake operating member side portion in the fluid supply system, and increasing the fluid pressure of the service brake operating member side portion in the brake working fluid supply system under required conditions. First control means for controlling the fluid pressure increasing mechanism, a parking brake operating member operating state detecting means for detecting an operating state of the parking brake operating member, and an operating state of the service brake operating member. The service brake operating member operating state detecting means and the first control means detect a service brake operation member. In the state that increases the fluid pressure of the actuating member side portion at the parking brake operating member operation state detection means, or detects that the parking brake operating member makes a parking brake release operation over several times the The parking brake operating member operating state detecting means detects that the parking brake operating member has performed the parking brake release operation, and the service brake operating member operating state detecting means detects the service brake operating member. A second control means for controlling the fluid pressure increasing mechanism so as to decrease the fluid pressure at the service brake actuating member side portion in the brake working fluid supply system when detecting that the actuation operation has been performed. It is characterized by.

[0012]

In the above-described parking brake safety device according to the first aspect of the present invention, the fluid pressure increasing mechanism is controlled by the first control means under required conditions, so that the service brake operating member side in the brake operating fluid supply system. The fluid pressure in the portion increases, and the braking force of the vehicle increases. Further, when the parking brake operating member operating state detecting means detects that the parking brake releasing operation has been performed a plurality of times in a state where the fluid pressure of the service brake operating member side portion is being increased by the first control means, The fluid pressure increasing mechanism is controlled by the second control means so as to decrease the fluid pressure at the service brake actuating member side portion in the brake actuating fluid supply system. Then, the operation of the parking brake safety device is thereby released.

In the parking brake safety device according to the second aspect of the present invention, the fluid pressure increasing mechanism is controlled by the first control means under required conditions, and the service brake operation in the brake working fluid supply system is performed. The fluid pressure at the member side increases, and the braking force of the vehicle increases. In a state where the fluid pressure on the service brake operating member side portion is being increased by the first control means, the parking brake operating member operating state detecting means detects that the parking brake operating member has performed the parking brake releasing operation. With
When the service brake operating member detects that the service brake operating member has performed the service brake operating operation by the service brake operating member operating state detecting means, the second control means determines the fluid pressure of the service brake operating member side portion in the brake working fluid supply system. The fluid pressure increasing mechanism is controlled to reduce the pressure, thereby deactivating the parking brake safety device.

In the parking brake safety device according to the third aspect of the present invention, the fluid pressure increasing mechanism is controlled by the first control means under required conditions, and the service brake operation in the brake working fluid supply system is performed. The fluid pressure at the member side increases, and the braking force of the vehicle increases. Further, in a state where the fluid pressure of the service brake operating member side portion is increased by the first control means, it is detected whether the parking brake operating member operating state detecting means detects that the parking brake releasing operation has been performed a plurality of times, Alternatively, the parking brake operating member operating state detecting means detects that the parking brake operating member has performed the parking brake release operation, and the service brake operating member operating state detects the service brake operating member by the service brake operating member operating state detecting means. When the operation is detected, the fluid pressure increasing mechanism is controlled by the second control means so as to decrease the fluid pressure at the service brake actuating member side portion in the brake actuating fluid supply system. The operation of the device is released.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A parking brake safety device as an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic control block diagram showing the overall configuration of a control system, and FIG. FIG. 3 is a schematic cross-sectional view showing a brake actuator as a main part configuration, FIG. 4 is a flowchart for simply explaining the operation, and FIG. 5 is an operation of the brake actuator in the present apparatus. FIG. 6 is a diagram for simply explaining the operation of releasing the operation of the brake actuator in the present device, and FIG. 7 is a schematic sectional view showing another example of the configuration of the brake actuator in the device. is there.

As shown in FIG. 2, the vehicle 1 is provided with a brake device. The brake device is provided with a slope start assist device 50 and a parking brake safety device 60. The fact that the vehicles 50 and 60 interact with each other makes it possible to easily start the vehicle 1 on a slope and to ensure the safety of the vehicle 1 during parking.

First, the slope start assisting device 50 will be described. The slope start assisting device 50 operates when the vehicle 1 is stopped by depressing the brake pedal (service brake operating member) 4 shown in FIG. Thing,
When it is detected that the driver has depressed the brake pedal 4 and the vehicle 1 has stopped for a predetermined time or more, a switching valve (magnet valve) provided in a brake fluid pressure supply system (brake actuation non-compressed fluid supply system) 6 7 is switched to contain the brake oil in the brake fluid pressure supply system 6 so that the braking force is maintained even when the driver releases his / her foot from the brake pedal 4.

As shown in FIG. 2, the vehicle 1 is provided with a front wheel brake (front wheel side brake) 2 and a rear wheel brake (rear wheel side brake) 3.
Normally, when the driver depresses the brake pedal 4, the driver's brake depressing force is boosted by the master cylinder 5, and the non-compressed fluid for brake operation (brake fluid or brake oil)
The fluid pressure (brake fluid pressure) is increased. Then, a brake shoe or a brake pad (both not shown) as a service brake operating member is operated by the brake fluid pressure to apply a braking force to the vehicle 1.

The brake fluid pressure supply system 6 on the rear wheel side of the vehicle 1 is also provided with an LSV (load sensing valve) 8. The LSV 8 is for detecting a load mainly on the rear wheel side of the vehicle 1 from the deflection of the rear spring and supplying a brake fluid pressure corresponding to the loaded load of the vehicle 1 to the rear wheel brake 3. Incidentally, the magnet valve 7 of the above-described slope start assist device 50 is controlled by a controller 9 as control means. As shown in FIG. 2, the controller 9 includes an operation switch 10, an adjustment switch 11, a clutch pedal stroke sensor (clutch sensor) 12, a vehicle speed sensor (vehicle speed detecting means) 13, a neutral switch (shift position detecting means) 14, Stop lamp switch (or service brake operating member operating state detecting means) 15, parking switch (parking brake operating member operating state detecting means) 1
6, a key switch 18 as a door switch 17 and an engine operating state detecting means are connected, and a magnet valve 7 is provided based on detection information from these sensors.
The operation of is controlled.

Here, the operation switch 10 is an on / off switch disposed around the driver, and when the operation switch 10 is turned on, the slope start assist device 5 is turned on.
When the operation switch 10 is turned off, the hill start assist device 50 does not operate. The adjustment switch 11 adjusts the operation of the slope start assist device 50, and is a switch that adjusts the timing of releasing from the state in which the brake fluid pressure is held.

The clutch pedal stroke sensor (clutch sensor) 12 is a sensor that detects when a driver steps on a clutch pedal (not shown) and outputs an ON signal, and a vehicle speed sensor (vehicle speed detecting means). ) 13
Is a power cutoff switch 6 for a vehicle speed sensor as a cutoff means.
4 is an active vehicle speed detecting means for detecting the vehicle speed by receiving the power supply from the battery 68 via the power supply 4.

The neutral switch 14 is provided as a shift position detecting means for detecting a shift position of the transmission. The neutral switch 14 outputs an ON signal only when the shift position of the transmission is in the neutral position. Has become. The stop lamp switch 15 is provided as a service brake operating member operating state detecting means. That is, the stop lamp switch 15
Is for detecting the operation state of the brake pedal (that is, the service brake operating member) 4. When the driver depresses the brake pedal 4, this is detected, and an ON signal is also output.

A parking switch (parking brake operating member operating state detecting means) 16 is a switch for detecting an operating state of a parking brake operating member (ie, parking brake lever, not shown). The operating state of the parking brake is detected based on the operating state of the parking brake. The door switch 17 is a sensor that can detect the open / closed state of the door on the driver's seat side of the vehicle 1. The key switch (engine operating state detecting means) 18 is when the engine (not shown) is operating (when the engine is on). Or a sensor that detects whether the engine is not operating (when the engine is off).

Further, as shown in FIG.
Is connected to an alarm lamp 20 and an alarm buzzer 21, and issues an alarm to the driver when the operation state of the slope start assist device 50 and the state of the vehicle 1 satisfy predetermined conditions. . This will be described later. Now, the parking brake safety device 60 according to the present invention will be described. The parking brake safety device 60 is configured to stop the vehicle 1 under a predetermined condition, and then to perform the operation even if the driver does not perform any operation. Regardless, when the vehicle 1 starts moving,
It operates to stop the vehicle 1.

That is, the parking brake safety device 60
For example, when the vehicle 1 starts to move naturally due to the effect of gravity or the like when the parking brake lever is not sufficiently pulled and the vehicle 1 is parked on a slope, this is detected and the brake fluid pressure is increased to mechanically increase the brake fluid pressure. The rear wheel brake 3 is operated. For this reason, as shown in FIG. 2, a brake actuator (fluid pressure increasing mechanism) that can adjust the brake fluid pressure is provided between the magnet valve 7 of the brake fluid pressure supply system 6 on the rear wheel side and the rear wheel brake 3. 19 are provided.

The brake actuator 19 operates in response to an operation command from the controller 9 described above.
By controlling the brake actuator 19 based on the detection information from 0 to 18, the operation of the parking brake safety device 60 is controlled. Here, the above-described brake actuator 19 will be described in detail with reference to FIG.
Consists mainly of an actuating part 22, a casing (actuator housing part) 23, a hydraulic chamber (hydraulic pressure generating chamber) 24, and a piston (pressure increasing member or piston member) 25.

The actuating section 22 is a rotary driving section for generating a rotational force.
Is constituted by a motor (electric motor). The motor 22 is attached to the casing 23, and rotates upon receiving a command signal from the controller 9. As shown in FIG. 3, a space 23 </ b> A is formed in the casing 23, and the space 2 </ b> A is formed.
3A is provided with a piston 25. A hydraulic chamber 24 is formed in the space 23A by the piston 25 and the casing 23. The volume of the hydraulic chamber 24 is changed by moving the piston 25 forward and backward using the rotational force generated by the motor 22. Thus, the hydraulic pressure to the brake operating member side (for example, brake shoes or brake pads) of the brake hydraulic pressure supply system 6 on the rear wheel side is increased.

A screw mechanism 28 is interposed between the motor 22 and the piston 25.
The position of the piston 25 is moved by the action of. That is, the screw mechanism 28 includes a male screw part 22A attached to the rotating part of the motor 22 and the male screw part 2A.
When the motor 22 is rotated to increase the brake fluid pressure, a male screw portion 22A is formed according to the rotational force of the motor 22.
Rotates to move the spacer 27 forward. When the spacer 27 advances by a predetermined amount, the spacer 27 comes into contact with the piston 25, and thereafter, the spacer 27 and the piston 25 advance integrally.

A first spring 26 is interposed between the spacer 27 and the piston 25. This first spring 2
6 is a male screw portion 22A when the piston 25 is advanced.
And the female screw 27A, thereby preventing the spacer 27 from being retracted smoothly. In the hydraulic chamber 24,
A second spring (return spring) 31 for urging the piston 25 against the urging force of the first spring 26 is provided. This is to allow the piston 25 to quickly retract without generating a residual pressure in the hydraulic chamber 24 when the motor 22 is operated to retract the spacer 27.

The hydraulic chamber 24 of the actuator 19 communicates with the hydraulic pressure supply system 6 on the master cylinder 5 side to supply a brake oil to the hydraulic chamber 24 with a first communication port 29, and a brake operating member. A second communication port 30 is formed to communicate with the brake fluid pressure supply system 6 on the (brake shoe or brake pad) side and supply the brake oil adjusted to a predetermined oil pressure in the hydraulic chamber 24 to the brake operating member side. Have been.

The volume in the hydraulic chamber 24 is changed by moving the piston 25 forward and backward. However, when the piston 25 moves forward to increase the brake hydraulic pressure, The one communication port 29 is closed by a valve mechanism 32, whereby the hydraulic pressure of the brake hydraulic pressure supply system 6 on the brake operating member side is reliably increased.

As shown in FIG. 3, the valve mechanism 32 includes a check ball 32A, a valve 32B, and a return spring 32.
When the piston 25 is retracted or the brake actuator 19 is not operated, the upper end of the valve 32B is locked to the tip of the piston 25 and tilts rightward in the figure. In such a case, the brake oil from the master cylinder 5 side flows from the first communication port 29 through the check ball 32A, the valve 32B, and the communication hole 25A formed at the tip of the piston 25. The oil is supplied to the hydraulic chamber 24.

When the brake actuator 19 is operated and the piston 25 moves forward, the upper end of the valve 32B responds to the movement of the piston 25, and the valve 32B becomes substantially vertical. In this case, the piston 25 and the check ball 32
A restricts the movement of the valve 32B in the vertical direction.
The communication port 29 is blocked by the check ball 32A, and the supply of the brake oil from the master cylinder 5 is stopped.

Reference numeral 69 shown in FIG. 3 denotes a rubber cup as a seal member, which prevents the brake oil from leaking into the space 23A. By the way, as described above, the operation of the slope start assist device 50 and the parking brake safety device 60 in the brake device are both controlled by the controller 9.
An overall configuration of a control system of the brake device will be described with reference to FIG.

As shown in FIG. 1, the controller 9 as a control means controls the operation of the slope start assist device 50 for controlling the operation of the slope start assist device 50 and the operation of the parking brake safety device 60. And a parking brake safety device control means 61 are provided. Then, the slope start assist device control means 51 includes the operation start controller 5.
2, an operation release controller 53, an operation alarm controller 54, and drivers 55 and 56 are provided. The parking brake safety device control means 61 includes an operation start controller (first control means) 62 and an operation release controller (second control means). 63, timer (timer means) 65, driver 6
It has 6,67.

First, the slope start assist device control means 51 will be described. The operation start controller 52 controls a start of the operation of the slope start assist device 50, and the operation release controller 53 controls the release of the operation. The operation alarm controller 54 is a control unit for performing an alarm for the operation. The above-described magnet valve 7, the alarm lamp 20, and the alarm buzzer 21 are connected to the slope start assist device control means 51, and these magnet valves are controlled based on control signals output from the drivers 55 and 56. 7, the operation of the alarm lamp 20 and the alarm buzzer 21 are controlled.

That is, as shown in FIG. 1, the operation start controller 52 of the slope start assist device control means 51 includes:
Among the sensors 10 to 18 described above, the clutch sensor 1
2, a vehicle speed sensor 13, a neutral switch 14, and a stop lamp switch 15 are connected. When the following three vehicle states are detected by the respective sensors 12 to 15 in the operation start controller 52, the vehicle starts on a slope. A control signal for operating the device 50 is set.

1. When the stop lamp switch 15 detects that the brake pedal 4 has been depressed for a predetermined time (for example, 1 second) or more. 2. The vehicle speed = 0 by the vehicle speed sensor 13 (ie, the vehicle is stopped)
Is detected. 3. It is detected that the clutch pedal is depressed by the clutch sensor 12, or the neutral switch 1
4. When it is detected that the gear position is in the neutral position.

If all of the above three conditions (1) to (3) are satisfied, the operation start controller 52 assumes that the driver is maintaining the vehicle 1 in a stopped state, and starts on a slope. A control signal for operating the auxiliary device 50 is set, and this control signal is output from the driver 55 to the magnet valve 7. As a result, the magnet valve 7 provided on the path of the front wheel side brake fluid pressure supply system 6 and the rear wheel side brake fluid pressure supply system 6 is turned on, and the brake fluid pressure is sealed. is there.

As described above, when the hill start assistance device 50 is operated, the vehicle 1 is stopped without stopping on the brake pedal 4 when the vehicle is stopped on a hill or when the vehicle is stopped during traffic jams. Fatigue is reduced. An operation switch 10 is also connected to the operation start controller 52. By turning off the operation switch,
The control signal set by the operation start controller 52 can be canceled.

On the other hand, the clutch controller 12, the neutral switch 14, and the parking switch 16 are connected to the operation release controller 53. The operation release controller 53 is based on the detection information from the sensors 12, 14, and 16 described above. When any one of the following two states is detected, a control signal for canceling the operation of the slope start assist device 50 is set.

4. When the neutral switch 14 detects that the gear of the transmission has been operated to a position other than neutral, and in addition, when the clutch sensor 12 detects that the clutch pedal has been released. 5. When the operation of the parking brake lever is detected by the parking switch 16.

In the case of 4. above, the operation release controller 53 determines that the driver is about to start the vehicle 1 and sets a control signal for releasing the operation of the slope start assist device 50. In this case, the driver 55
This release signal is output to the magnet valve 7 from the controller. In the case of 5, since the vehicle 1 is stopped by the parking brake,
The operation release controller 53 determines that there is no need to stop the vehicle 1 by containing the brake fluid pressure, and sets a control signal for releasing the operation of the slope start assist device 50. In this case, when the other predetermined condition is satisfied, the above-described parking brake safety device 60 operates to surely keep the vehicle 1 in a stopped state. This case will be described later.

As described above, when any one of the above conditions 4 and 5 is satisfied, the operation release signal set by the operation release controller 53 is transmitted to the driver 55.
Is output to the magnet valve 7, whereby the magnet valve 7 is switched off. Therefore, when starting the vehicle 1, the driver can start the vehicle 1 by operating the accelerator pedal and the clutch pedal without operating the brake pedal 4, so that the driver particularly starts on a slope. Sometimes, the vehicle 1 can be easily started.

When the parking brake is actuated (case 5), the vehicle 1 is often stopped for a relatively long time. Therefore, the operation of the slope start assist device 50 is released to release the brake fluid. By releasing the brake oil in the pressure supply system 6 from the high pressure state, the service brake 2,
The unnecessary load on 3 has been eliminated. An adjustment switch 11 is also connected to the operation release controller 53. By operating the adjustment switch 11, the operation release timing of the slope start assist device 50 can be adjusted.

Next, the operation alarm of the slope start assist device 50 will be described. The parking switch 16, the door switch 17, and the key switch 18 are connected to the operation release controller 53, and the operation of the slope start assist device 50 is performed. When it is detected that the driver has performed any of the following operations, the controller 9 activates an alarm lamp 20 and an alarm buzzer 21 to warn the driver.

6. When the parking switch 16 and the door switch 17 detect that the door has been opened without pulling the parking brake lever. 7. When the stop of the engine is detected by the parking switch 16 and the key switch 18 without the parking brake lever being pulled. In the case of 6. above, the operation release controller 53 determines that the driver leaves the vehicle 1 without operating the parking brake, sets an alarm signal, and sets the alarm signal to the alarm lamp 20 and the alarm buzzer 21 from the driver 56. This warning signal is output. This activates the alarm lamp 20 and the alarm buzzer 21 to call the driver's attention.

In addition to the cases described in 6. and 7. above, when an abnormality is detected in the slope start assist device 50, the alarm lamp 20 and the alarm buzzer 21 are operated in the same manner as described above. , To alert the driver. In this manner, by providing the vehicle 1 with the slope start assist device 50, when the start and the stop are frequently repeated, the driver's fatigue can be greatly reduced.
It is possible to start the slope safely and reliably.

Next, the parking brake safety device control means 61
As described above, as described above, the parking brake safety device control means 61 includes the operation start controller 6
2, operation release controller 63, timer (timer means)
65, and drivers 66 and 67 are provided. The above-mentioned operation start controller 62 is a control unit for controlling the start of operation of the parking brake safety device 60, and the operation release controller 63 is a control unit for releasing the operation. The timer 65 will be described later.

As shown in FIG. 1, the parking brake safety device control means 61 is connected to a brake actuator (fluid pressure increasing mechanism) 19 and a parking brake lamp 33 which is turned on when the parking brake is activated. The operation of the brake actuator 19 and the parking brake lamp 33 is controlled based on control signals output from the drivers 66 and 67.

Here, the parking brake safety device control means 6
The first operation start controller 62 will be described. This operation start controller 62 outputs a control signal for operating the parking brake safety device 60 when a predetermined vehicle speed is detected even though the parking brake is operating. To be set. More specifically, as shown in FIG. 1, a vehicle speed sensor 13, a neutral switch 14, a parking switch 16, and a key switch 18 are connected to the operation start controller 62. 14,
When any one of the following vehicle conditions from 8. and 9 is detected from 16 and 18, the brake actuator 19 is operated to increase the hydraulic pressure of the brake oil.

8. When the vehicle speed sensor 13 detects a predetermined vehicle speed despite the fact that the parking switch 16 detects that the parking brake is being operated, the key switch 18 is operating the engine. And the neutral switch 14 detects that the shift position is in the neutral position. 9. When the vehicle speed sensor 13 detects a predetermined vehicle speed, even though the parking switch 16 detects that the parking brake is operating, the key switch 18 determines that the engine is not operating. When detected.

In the cases of 8. and 9, the operation start controller 62 determines that the vehicle 1 has started to move naturally due to a slope such as a slope, even though the vehicle is stopped by the parking brake. , The parking brake safety device 60 from the driver 66 to the brake actuator 19
Thus, a control signal for activating is output.

As a result, the brake actuator 19 provided on the path of the brake fluid pressure supply system 6 on the rear wheel side operates to increase the brake fluid pressure, increase the braking force of the vehicle 1, and stop the vehicle 1. It is like that. As described above, in the parking brake safety device 60, when the vehicle 1 starts moving naturally during parking on a slope or the like, the safety of the vehicle 1 during parking is ensured by activating the brake actuator 19 and increasing the brake fluid pressure. It is.

At this time, a signal for blinking the parking brake lamp 33 is output from the driver 67 to notify the driver that the parking brake safety device 60 is operating. In the case of 9 above,
When the key switch 18 detects that the engine is not operating, the timer 65 is triggered and the timer 65 starts counting.

When the timer 65 detects that a predetermined time (for example, one hour) has elapsed while the vehicle 1 is stopped, the power switch 64 for the vehicle speed sensor is turned off in response to a time-up signal from the timer 65. As a result, the power supply to the vehicle speed sensor 13 is cut off. At this time, the system power switch 64A is turned off by a time-up signal from the timer 65.

Thus, the monitoring state of the vehicle 1 by the operation start controller 62 is released. In this case, the parking brake lamp 33 from the driver 67
Is also turned off to notify the driver that the operation of the parking brake safety device 60 has been turned off. When it is detected by the timer 65 that the stop state of the vehicle 1 has continued for a predetermined time since the engine was inactive, the power supply to the vehicle speed sensor 13 was cut off, and the parking brake safety was further reduced. The device control means 61 is turned off for the following reason.

That is, since the vehicle speed sensor 13 is an active type vehicle speed sensor that always requires electric power, if the operation start controller 62 is kept on when parking for a long period of time, the battery may run out. It is. In addition, the vehicle 1 within a predetermined time set in advance.
If the start of the vehicle 1 is not detected, that is, if the stop state of the vehicle 1 is continued for one hour in this example, it is determined that the parking brake is sufficiently operated and the safety of the parking is secured. Because it is possible.

The timer 65 is reset by a timer reset means (not shown) while the key switch 18 is operating the engine. The operation start controller 62
The operation switch 10 is connected similarly to the operation start controller 52 of the slope start assist device control means 51. By turning off the operation switch, the control signal set by the operation start controller 62 is also transmitted. You can cancel it.

On the other hand, the parking brake safety device control means 61
The stop lamp switch 15 and the parking switch 16 are connected to the operation release controller 63 of the above.
Based on the detection information from 5 and 16, the following 10. and 11.
When any one of the vehicle states is detected, a control signal for releasing the operation of the parking brake safety device 60 is set.

10. When the releasing operation of the parking brake lever is continuously detected by the parking switch 16 a predetermined number of times (for example, twice). 11. When the parking switch 16 detects the release operation of the parking brake lever and the stop lamp switch 15 detects the depression of the brake pedal (that is, the operation operation of the service brake).

In other words, in order for the parking brake safety device 60 to be activated, it is necessary to operate the parking brake as described in detail in the above paragraphs 8 and 9; The prerequisite is to release the parking brake as shown in Figs. Here, when the above-mentioned 10. is explained, when the parking brake safety device 60 is released when the brake actuator 19 is operated to increase the brake fluid pressure, the parking brake is released only by one parking brake release operation. The safety device 60 cannot be released. Thus, even if the driver unconsciously releases the parking brake, the brake actuator 19 does not operate to reduce the brake fluid pressure, and the safety of the vehicle 1 during parking is ensured. .

That is, by setting the releasing condition of the parking brake safety device 60 to be such that the releasing operation of the parking brake lever is performed a plurality of times (for example, two times) continuously, the driver can intentionally (intentionally) operate. Otherwise, the parking brake safety device 60 cannot be released. In addition,
When the vehicle speed is detected, the actuator 19 operates when the parking brake is operating and the engine is operating and the shift position is in the neutral position, or when the parking brake is operating and the engine is not operating. The parking brake safety device 60 is brought into a standby state as described above (8. and 9. above). In this standby state, while the vehicle speed is not detected, the parking brake safety device is operated by one release operation of the parking brake. The monitoring state (standby state) of 60 is released to allow normal traveling.

In the case of 11. above, the operation release controller 63 determines that the driver is about to start the vehicle 1 and releases the operation of the brake actuator 19. And these one
In the case of 0, 1 and 11, an operation release signal is set by the operation release controller 63, and the driver 66 outputs this operation release signal to the brake actuator 19.

Since the present embodiment is configured as described above, the parking brake safety device 60 is operated by operating the brake actuator 19 according to, for example, a flowchart shown in FIG. Here, the flowchart shown in FIG. 4 will be briefly described. First, step S
When the stop of the vehicle 1 is detected by the vehicle speed sensor 13 in step 1, the process proceeds to step S2, and the parking switch 16 detects the operation of the parking brake. When the vehicle speed sensor 13 detects that the vehicle 1 has started moving in step S3, the key switch 18 detects that the engine is operating in step S4,
An operating condition that the neutral gear 14 detects that the shift position is in the neutral position, or that the key switch 18 detects in step S5 that the engine is not operating (the shift position of the transmission is arbitrary). Is satisfied, the brake actuator 19 is operated in step S6 to increase the brake fluid pressure.

Then, in step S7, the rear wheel brake 3 is operated, and in step S8, the parking brake lamp 33 is operated to notify the driver of the operation of the parking brake safety device 60. FIG. 5 illustrates the operation of the brake actuator 19 when the parking brake safety device 60 operates. That is, when an operation signal is set to the brake actuator 19 by the operation start controller 62 and this signal is output from the driver 66, first, the motor 22 rotates to rotate the male screw portion 22A of the screw mechanism 28.

As a result, the spacer 27 with the female screw 27A screwed into the male screw portion 22A advances while compressing the first spring 26, and comes into contact with the piston 25. After that, the spacer 27 advances integrally while abutting on the piston 25, and the volume of the hydraulic chamber 24 is reduced. At this time, the first hydraulic fluid supply system 6 on the master cylinder 5 side can supply the brake oil to the hydraulic chamber 24 by the first hydraulic pressure supply system 6.
The communication port 29 is closed by the valve mechanism 32. That is, when the piston 25 moves forward, the valve 32B of the valve mechanism 32
In response to the movement of the piston 25, the upper end of the valve 32B becomes substantially vertical, and the piston 25 and the check ball 32
A restricts the movement of the valve 32B in the vertical direction.
The communication port 29 is shut off by the check ball 32A, and the brake oil is not supplied.

Therefore, when the piston 25 moves forward,
As the first communication port 29 is closed and the volume of the hydraulic chamber 24 is reduced, the hydraulic pressure between the brake actuator 19 and the brake operating member in the brake hydraulic pressure supply system 6 increases, and the vehicle 1 A larger braking force is applied. Thereafter, the hydraulic reaction force acting on the motor 22 increases, thereby increasing the current of the motor 22. When the current value exceeds a predetermined value, the controller 9
Turns off the power supply to the motor 22. Thus, even if the operation of the motor 22 is stopped, the position of the piston 25 is fixed by the frictional force between the female screw 27A and the male screw portion 22A of the spacer 27 and the contact portion thereafter. Can be easily held.

As described above, at this time, a signal for blinking the parking brake lamp 33 is output from the driver 67 to notify the driver that the parking brake safety device 60 is operating. FIG. 6 illustrates the operation of the brake actuator 19 when the parking brake safety device 60 is deactivated.

That is, when an operation release signal is set to the brake actuator 19 by the operation release controller 62 and this signal is output from the driver 66, in the brake actuator 19, the motor 22 rotates in the reverse direction and the male screw of the screw mechanism 28 is rotated. The part 22A is rotated in the reverse direction. Thereby, the spacer 27 with the female screw 27 </ b> A is retracted while receiving the urging force of the first spring 26. At this time, the piston 25 retreats by the action of the hydraulic reaction force in the hydraulic chamber 24 and the urging force of the return spring 31 disposed in the hydraulic chamber 24, and the piston 25 is moved backward by the brake actuator 19 in the brake fluid pressure supply system 6. The hydraulic pressure between the brake operating member and the brake operating member decreases.

At this time, the first communication port 29 and the hydraulic chamber 24 communicate with each other. That is, when the piston 25 retreats, the upper end of the valve 32B is locked to the tip of the piston 25 and tilts to the right in the figure. In such a case, the brake oil in the hydraulic chamber 24 is checked. The communication with the first communication port 29 is established through the communication hole 25A formed at the tip of the ball 32A, the valve 32B and the piston 25.

Accordingly, the brake fluid pressure of the rear wheel brake 3 to the brake operating member side is released, and the braking force is not exerted. When the brake fluid pressure is released, the power of the motor 22 is turned off. When the operation of the motor 22 is stopped, a hydraulic reaction force that pushes back the piston 25 is generated in the hydraulic chamber 24 to generate reverse rotation torque in the motor 22.
8, the female screw 27 of the spacer 27 is formed.
Since the position of the piston 25 is fixed by the frictional force between the contact portion A and the male screw portion 22A, the hydraulic pressure of the brake oil can be easily maintained.

As described above, in the brake device using the brake actuator 19, the hill start assist device 50 is operated at the time of a temporary stop such as a signal waiting or traffic jam, so that the braking force is maintained even when the foot is released from the brake pedal 4. By doing so, the driver's fatigue can be reduced, and the vehicle can easily start on a slope. on the other hand,
When the parking brake is operated and the vehicle 1 is parked and stopped, the parking brake safety device is determined if the engine is operating and the shift position is a neutral position, or if the engine is not operating and the shift position is arbitrary. 60 is activated. As a result, the vehicle 1 does not operate at all on a slope or the like.
When the vehicle starts moving, the brake actuator 19 operates to increase the brake fluid pressure, thereby ensuring the safety of the vehicle 1 parked or stopped.

Further, it is determined whether or not the release operation of the parking brake lever is detected a predetermined plurality of times (for example, twice) continuously.
Alternatively, when the release operation of the parking brake lever is detected and the depression of the brake pedal 4 (that is, the operation operation of the service brake) is detected, it is assumed that the driver is intentionally releasing the parking brake safety device 60. The parking brake safety device 60 is released by making a determination, and this releasing operation is executed by operating the brake actuator 19 in the reverse of the above-described manner to reduce the brake fluid pressure.

As described above, even when the parking brake safety device 60 is in operation, when the parking brake lever release operation is detected a predetermined number of times (for example, twice), the operation of the parking brake safety device 60 is performed. The release is performed because the driver determines that the driver has intentionally activated the parking brake to securely park the vehicle 1 (that is, the driver has intentionally released the parking brake safety device 60). It is. This prevents the driver from unconsciously canceling the operation of the parking brake safety device 60, and also cancels unnecessary operation of the parking brake safety device 60 to reduce the load on the battery. You can do it.

As described above, when the parking brake safety device 60 is operated, the release operation of the parking brake lever is detected, and when the depression of the brake pedal 4 is detected, the operation of the parking brake safety device 60 is also released. However, this is because it is determined that the driver is about to start the vehicle 1 and the brake actuator 1
9 is released, and the vehicle 1 can be driven.

Since the first spring 26 is interposed between the piston 25 and the spacer 27 in the brake actuator 19 as described above, when the piston 25 is advanced (when the brake fluid pressure is increased). ), The engagement of the male screw portion 22A and the female screw 27A is prevented, so that even when the motor 22 is reversely rotated to reduce the brake fluid pressure, the motor 22 is smoothly reversely rotated and the piston 25 and the spacer 27 can be reliably retracted.

The piston 2 is placed in the hydraulic chamber 24 of the brake actuator 19 against the urging force of the first spring 26.
By providing the second spring 31 for urging the piston 5, when the spacer 27 is retracted, the piston 25 can be quickly retracted without generating a residual pressure in the hydraulic chamber 24. When the parking brake safety device 60 is operated when the engine is off, the timer 65 is triggered and the counting is started. The timer 65 stops the vehicle 1 for a predetermined time (for example, 1
When the elapsed time is detected, it is determined that the parking brake is sufficiently operated and parking safety is secured, and the power switch 64 for the vehicle speed sensor and the power switch 64A for the system are turned off. The vehicle speed sensor 13 and the parking brake safety device control means 61 are turned off. In this case, the blinking signal of the parking brake lamp 33 from the driver 67 is also turned off to notify the driver that the operation of the parking brake safety device 60 has been turned off.

As a result, unnecessary power consumption by the vehicle speed sensor 13 can be suppressed, and the running out of the battery can be prevented. Further, in the timer 65, while the engine is being operated by the key switch 18, the timer 65 is reset by timer reset means (not shown), so that the predetermined time is reliably counted only when the engine becomes inoperative. be able to.

Further, when the parking brake safety device 60 operates, the parking brake lamp 33 blinks based on the output signal from the driver 67, so that the parking brake safety device 60 can reliably inform the driver of the operation. it can. The brake actuator 19 may have a configuration shown in FIG. 7, for example, in addition to the configuration shown in FIG.

In the actuator 19 shown in FIG. 7, the screw mechanism 28 is composed of a collar member 34 with a female thread, a piston 25A with a female thread, and a male thread portion 22A. Is rotated to directly move the collar member 34 and the piston 25A forward and backward. That is, FIG.
The first spring 26 shown in FIG. 3 is eliminated, and the responsiveness of the actuator 19 can be increased by directly moving the piston 25A forward and backward by the motor 22.

Further, the piston 25A can be directly moved backward by rotating the motor 22 in the reverse direction.
There is no need to provide a return spring (see reference numeral 31 in FIG. 3) in the hydraulic chamber 24, and the number of components is reduced. The configuration other than the above is the same as that shown in FIG. 3, and the description of the same reference numerals as in FIG. 3 is omitted.

The brake actuator 19 does not necessarily need to be provided in the brake fluid pressure supply system 6 on the rear wheel side, but may be provided in the brake fluid pressure supply system 6 on the front wheel side, for example. Furthermore, the front wheel brake actuator and the rear wheel brake actuator that are independently configured may be provided in the brake fluid pressure supply system 6 on the front wheel side and the rear wheel side, respectively. With such a configuration, safety during parking of the vehicle can be more reliably ensured.

[0084]

As described in detail above, according to the parking brake safety device of the first aspect of the present invention, in a vehicle equipped with a parking brake, in response to the operation of the service brake operating member, the vehicle is equipped with a wheel. A brake working fluid supply system for supplying a required amount of brake working fluid to the service brake working member; and a brake working fluid supply system interposed between the brake working fluid supply system and a fluid pressure on a service brake working member side portion of the brake working fluid supply system. A first fluid pressure increasing mechanism for controlling the fluid pressure increasing mechanism so as to increase a fluid pressure of a service brake actuating member-side portion of the brake actuating fluid supply system under required conditions; Control means is provided, and a parking brake operating member operating state detecting means for detecting an operating state of the parking brake operating member; In a state where the fluid pressure on the service brake operating member side portion is being increased by one control means, the parking brake operating member performs the parking brake releasing operation a plurality of times by the parking brake operating member detecting means. The second control means for controlling the fluid pressure increasing mechanism is provided so as to reduce the fluid pressure at the service brake actuating member-side portion of the brake actuating fluid supply system upon detecting that Since the parking brake safety device is released only when the driver performs the release operation intentionally, the driver is prevented from unconsciously releasing the operation of the parking brake safety device. In addition, when the driver intentionally releases the parking brake safety device, unnecessary operation of the parking brake safety device is released, and the load on the battery can be reduced.

According to the parking brake safety device of the present invention, in a vehicle equipped with a parking brake, a vehicle equipped with a parking brake is provided with a wheel in response to operation of a service brake operating member. A brake working fluid supply system for supplying a required amount of brake working fluid to the service brake working member, and a fluid pressure of a service brake working member side portion of the brake working fluid supply system interposed in the brake working fluid supply system. And a fluid pressure increasing mechanism for controlling the fluid pressure increasing mechanism so as to increase the fluid pressure of the service brake actuating member side portion in the brake actuating fluid supply system under required conditions. (1) A parking brake operating member for detecting an operating state of the parking brake operating member, A state detecting means, a service brake operating member operating state detecting means for detecting an operating state of the service brake operating member, and a state in which the first control means increases the fluid pressure of the service brake operating member side portion. at the parking brake operating member operation state detection means, and detects that the parking brake operating member makes a parking brake release operation at the service brake operating member operation state detection means, is the service brake operating member Second control means is provided for controlling the fluid pressure increasing mechanism so as to decrease the fluid pressure of the service brake actuating member side portion in the brake actuating fluid supply system when detecting that the service brake actuation operation has been performed. With this configuration, only when the driver intentionally performs the release operation, the parking brake safety Because There is released, the driver is prevented from being released to actuation of the parking brake safety system unconsciously. In this case, the driver determines that the driver is about to start the vehicle and releases the parking brake safety device, so that the vehicle can run. It is released and the load on the battery can be reduced.

According to the parking brake safety device of the present invention, in a vehicle equipped with a parking brake, the required pressure is applied to the service brake operating member with wheels in response to the operation of the service brake operating member. A brake working fluid supply system for supplying the brake working fluid, and a fluid pressure increasing mechanism interposed in the brake working fluid supply system for increasing the fluid pressure of the service brake working member side portion of the brake working fluid supply system And a first control means for controlling the fluid pressure increasing mechanism so as to increase the fluid pressure of the service brake actuating member side portion in the brake actuating fluid supply system under required conditions, Parking brake operating member operating state detecting means for detecting the operating state of the parking brake operating member,
The service brake operating member operating state detecting means for detecting the operating state of the service brake operating member, and the parking brake operating in a state where the fluid pressure of the service brake operating member side portion is increased by the first control means. at member operating state detecting means, or detects that the parking brake operating member makes a parking brake release operation across multiple at the parking brake operating member operation state detection means, is the parking brake operating member parking brake When the release operation is detected and the service brake operation member operation state detecting means detects that the service brake operation member has performed the service brake operation operation, the service brake in the brake working fluid supply system is detected. In order to reduce the fluid pressure of the operating member side part,
With the configuration in which the second control means for controlling the fluid pressure increasing mechanism is provided, the parking brake safety device is released only when the driver consciously performs the releasing operation.
This prevents the driver from unconsciously canceling the operation of the parking brake safety device. In addition, when the driver intentionally releases the parking brake safety device, unnecessary operation of the parking brake safety device is released, and the load on the battery can be reduced. In addition, by releasing the parking brake safety device, the vehicle can run, and the vehicle can be started quickly.

[Brief description of the drawings]

FIG. 1 is a schematic control block diagram showing the overall configuration of a control system in a parking brake safety device as one embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing an overall configuration of a parking brake safety device as one embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view showing a brake actuator as a main part configuration in a parking brake safety device as one embodiment of the present invention.

FIG. 4 is a flowchart for briefly explaining the operation of the parking brake safety device as one embodiment of the present invention.

FIG. 5 is a view for briefly explaining the operation of a brake actuator in the parking brake safety device as one embodiment of the present invention.

FIG. 6 is a diagram for briefly explaining an operation release operation of a brake actuator in the parking brake safety device as one embodiment of the present invention.

FIG. 7 is a schematic sectional view showing another configuration example of the brake actuator in the parking brake safety device as one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Front wheel brake (front wheel side brake) 3 Rear wheel brake (rear wheel side brake) 4 Brake pedal (service brake operating member) 5 Master cylinder 6 Brake hydraulic pressure supply system (non-compressed fluid supply system for brake operation) 7 Switching valve (magnet valve) 8 LSV (load sensing valve) 9 Controller 9 as control means 10 Operation switch 11 Adjustment switch 12 Clutch pedal stroke sensor (or clutch sensor) 13 Vehicle speed sensor (Active type vehicle speed detection means) 14 Neutral switch (Shift position detecting means) 15 stop lamp switch (service brake operating member operating state detecting means) 16 parking switch (parking brake operating member operating state detecting means) 17 door switch 18 key switch ( Engine operation state detecting means) 19 brake actuator (fluid pressure increasing mechanism) 20 alarm lamp 21 alarm buzzer 22 motor (actuate section) 22A male screw section 23 casing (actuator housing section) 23A space section 24 hydraulic chamber (hydraulic pressure generation) Chamber) 25 piston (pressure increasing member or piston member) 25A communication hole 26 first spring 27 female threaded spacer 27A female screw 28 screw mechanism 29 first communication port 30 second communication port 31 return spring (second spring) 32 valve Mechanism 32A Check ball 32B Valve 32C Return spring 33 Parking brake lamp 50 Slope start assist device 51 Slope start assist device control means 52 Operation start controller 53 Operation release controller 54 Operation alarm controller 55, 56 Driver 60 Parking shake Safety device 61 Parking brake safety device control means 62 Operation start controller (first control means) 63 Operation release controller (second control means) 64 Power cutoff switch for vehicle speed sensor (cutoff means) 64A System power switch 65 Timer means 66 , 67 Driver 68 Battery 69 Rubber cup

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-218458 (JP, A) JP-A-3-148356 (JP, A) JP-A-61-81852 (JP, A) JP-A-5-218 85318 (JP, A) JP-A-62-275864 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60T 7/12 B60T 17/18

Claims (3)

(57) [Claims] 1. A vehicle equipped with a parking brake, a brake working fluid supply system that supplies a brake working fluid of a required pressure to a service brake operating member with wheels in response to an operation of a service brake operating member; A fluid pressure increasing mechanism interposed in the working fluid supply system for increasing the fluid pressure of the service brake actuating member-side portion of the brake working fluid supply system; A first control means for controlling the fluid pressure increasing mechanism is provided so as to increase a fluid pressure of a service brake operating member side portion of the system, and a parking brake operating member operating state for detecting an operating state of the parking brake operating member. The detecting means and the first control means increase the fluid pressure in the service brake operating member side portion. In this state, when the parking brake operating member operation state detecting means detects that the parking brake operating member has performed the parking brake releasing operation a plurality of times, the service brake operating member side portion in the brake working fluid supply system is detected. A second control unit for controlling the fluid pressure increasing mechanism so as to decrease the fluid pressure. 2. A vehicle equipped with a parking brake, a brake working fluid supply system for supplying brake working fluid of a required pressure to a service brake operating member with wheels in response to operation of a service brake operating member, and the brake. A fluid pressure increasing mechanism interposed in the working fluid supply system for increasing the fluid pressure of the service brake actuating member-side portion of the brake working fluid supply system; A first control means for controlling the fluid pressure increasing mechanism is provided so as to increase a fluid pressure of a service brake operating member side portion of the system, and a parking brake operating member operating state for detecting an operating state of the parking brake operating member. Detecting means for detecting the operation state of the service brake operating member; A state detecting means at said first control means, in a state in which increased fluid pressure in the service brake actuating member side portion at the parking brake <br/> key operating member operating state detecting means, the parking brake When the operation member detects that the parking brake release operation has been performed and the service brake operation member operation state detecting means detects that the service brake operation member has performed the service brake operation, the brake operating fluid A parking brake safety device, further comprising second control means for controlling the fluid pressure increasing mechanism so as to reduce the fluid pressure at the service brake operating member side portion in the supply system. 3. A vehicle equipped with a parking brake, a brake working fluid supply system that supplies a brake working fluid of a required pressure to a service brake operating member with wheels in response to an operation of a service brake operating member, and the brake. A fluid pressure increasing mechanism interposed in the working fluid supply system for increasing the fluid pressure of the service brake actuating member-side portion of the brake working fluid supply system; A first control means for controlling the fluid pressure increasing mechanism is provided so as to increase a fluid pressure of a service brake operating member side portion of the system, and a parking brake operating member operating state for detecting an operating state of the parking brake operating member. Detecting means for detecting the operation state of the service brake operating member; A state detecting unit, wherein the first control unit increases the fluid pressure of the service brake operating member side portion, and the parking brake operating unit detects the parking brake operating member a plurality of times by the parking brake operating member operating state detecting unit; detects that conducted the parking brake release operation over either the at the parking brake operating member operation state detection means, and detects that the parking brake operating member makes a parking brake release operation, the service brake operating member When the operating state detecting means detects that the service brake operating member has performed the service brake operating operation, the hydraulic pressure is reduced so as to decrease the fluid pressure of the service brake operating member side portion in the brake operating fluid supply system. And a second control means for controlling the increasing mechanism.