JPH08198070A - Parking brake safety device - Google Patents

Abstract

(57) [Abstract] [Object] The present invention relates to a parking brake safety device, and an object thereof is to prevent the parking brake safety device from being used in place of the parking brake. A brake working fluid supply system for supplying a brake working fluid, a fluid pressure increasing mechanism 19 capable of increasing the brake working fluid pressure, and a parking brake working state detecting means 16
The vehicle speed detection means 13 and the control means 9 are provided. When the parking brake is operating and a predetermined vehicle speed is detected by the detection information from the parking brake operating state detection means 16 and the vehicle speed detection means 13, the control means is provided. 9 is a fluid pressure increasing mechanism 19
To increase the brake working fluid pressure,
When non-operation of the parking brake is detected by the parking brake operating state detecting means 16, the control means 9 controls the fluid pressure increasing mechanism 19 to reduce the brake operating fluid pressure.

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, a brake assisting device has been developed which can reduce the troublesomeness of the driver's brake operation. Such a conventional brake assist device is a device that 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 if the driver releases the brake pedal. Yes, this allows the driver to keep the vehicle stopped without having to continue to press the brake pedal. Further, when the driver puts the clutch in the connected state, the operation of the above-mentioned brake assist device is released, and normal traveling can be performed.

Explaining this kind of device concretely, for example, an actuator for keeping the brake fluid pressure is provided on the hydraulic fluid supply path of the brake of the vehicle, and the vehicle is stopped while the brake pedal is depressed. When the brake pedal is released for a predetermined period of time and then the foot is released, the computer detects this and supplies air pressure or the like to the actuator to maintain the braking force.

As a result, it is not necessary to continue to step on the brake pedal due to traffic congestion or waiting for a signal, and physical and mental fatigue can be reduced. In addition, it is possible to easily start up a slope and the like, and further, it is possible to minimize damage even when a rear-end collision occurs and prevent an accident from spreading. Also, JP-A-63-2582
Japanese Patent Publication No. 47 discloses a braking force holding device as an example of the above-mentioned brake assist device.

[0005]

By the way, such a conventional brake assist device is constructed so as to keep the brake fluid pressure constant during operation. For example, a vehicle parked on a slope starts to move. In this case, the brake fluid pressure was not positively increased to stop the movement of the vehicle.

Further, Japanese Utility Model Laid-Open No. 5-22224 discloses that
In the by-wire type brake device, a brake actuator that can obtain a braking force even when electrical control is impossible is disclosed, but this also does not positively stop the movement of the vehicle during parking. Therefore, an actuator that can adjust the brake fluid pressure is provided in the brake oil supply system of the vehicle, and when it is determined that the parked vehicle has started to move based on the detection information from various sensors such as the vehicle speed sensor, the controller causes the brake actuator to move. It is conceivable to provide a parking brake safety device configured to actively stop the vehicle by controlling the operation of.

However, in a vehicle using such a parking brake safety device, it is possible that the driver operates the parking brake safety device instead of the parking brake when the vehicle is parked. The present invention has been made in view of the above problems, and an object thereof is to provide a parking brake safety device that prevents the parking brake safety device from being used as a substitute for the parking brake.

[0008]

Therefore, the parking brake safety device of the present invention according to claim 1 is a vehicle equipped with a parking brake, and responds to the operation of the service brake operating member to provide a service brake with wheels. A brake working fluid supply system for supplying a brake working fluid of a required pressure to the working member, and a brake working fluid supply system interposed to increase the fluid pressure of the service brake working member side portion of the brake working fluid supply system. A parking brake operating state detecting means for detecting an operating state of the parking brake, a vehicle speed detecting means for detecting a vehicle speed, and a parking brake operating state detecting means and a vehicle speed detecting means. Based on the detection result, if the predetermined vehicle speed is detected on the assumption that the parking brake is operating,
The fluid pressure of the service brake operating member side portion in the brake operating fluid supply system is increased, and when the parking brake is deactivated based on the parking brake operating state detecting means, the fluid pressure of the service brake operating member side portion is increased. It is characterized in that a control means for controlling the fluid pressure increasing mechanism is provided so as to release the increased state and reduce the fluid pressure.

Further, in the parking brake safety device of the present invention as defined in claim 2, in addition to the configuration of claim 2, the parking brake operating state detecting means determines the operating state of the parking brake by operating the parking brake operating member. It is characterized in that it is configured to detect from a position.

[0010]

In the parking brake safety device according to the first aspect of the present invention, when the parking brake operating state detecting means and the vehicle speed detecting means detect that the parking brake is operating and a predetermined vehicle speed is detected, The control means controls the fluid pressure increasing mechanism interposed in the brake working fluid supply system, so that the fluid pressure at the service brake working member side portion of the brake working fluid supply system increases. Further, when the parking brake operating state detecting means detects that the parking brake is inactive, the state in which the fluid pressure of the service brake operating member side portion of the fluid pressure increasing mechanism in the fluid pressure increasing mechanism is released by the control means is released. Is reduced.

Further, in the parking brake safety device according to the second aspect of the present invention, the parking brake operating state detecting means detects the operating state of the parking brake based on the operating position of the parking brake operating member.

[0012]

DETAILED 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 its control system, and FIG. FIG. 3 is a schematic configuration diagram showing the same, FIG. 3 is a schematic cross-sectional view showing a brake actuator as a main configuration thereof, FIG. 4 is a flowchart for briefly explaining its operation, and FIG. FIG. 6 is a diagram for briefly explaining the operation of releasing the operation of the brake actuator in the present device, and FIG. 7 is a schematic cross-sectional view showing another configuration example of the brake actuator in the device. is there.

As shown in FIG. 2, the vehicle 1 is provided with a braking device, and the braking device is provided with a slope start assist device 50 and a parking brake safety device 60, and these devices are provided. 50 and 60 interact with each other to facilitate starting of the vehicle 1 on a slope and to ensure the safety of the parked vehicle 1.

First, the slope starting assist device 50 will be described. The slope starting assist device 50 operates when the vehicle 1 is stopped by stepping on the brake pedal (service brake operating member) 4 shown in FIG. The thing
When it is detected that the driver depresses the brake pedal 4 to stop the vehicle 1 for a predetermined time or longer, a switching valve (magnet valve) provided in the brake fluid pressure supply system (brake actuation non-compressed fluid supply system) 6 7 is switched to confine the brake oil in the brake fluid pressure supply system 6 so that the braking force is maintained even if the driver releases 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 brake pedal force of the driver 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. The brake fluid pressure actuates a brake shoe or a brake pad (neither of which is shown) as a service brake actuating member to apply a braking force to the vehicle 1.

An LSV (load sensing valve) 8 is also provided in the brake fluid pressure supply system 6 on the rear wheel side of the vehicle 1. The LSV 8 is for mainly detecting the load on the rear wheel side of the vehicle 1 from the bending of the rear spring and supplying the brake fluid pressure corresponding to the loaded load of the vehicle 1 to the rear wheel brake 3. By the way, the magnet valve 7 of the above-mentioned slope start assisting device 50 is controlled by a controller 9 as a 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 door switch 17 and a key switch 18 as an engine operating state detecting means are connected, and the slope start assisting device 5 is provided on the basis of detection information from these sensors.
The operation of the magnet valve 7 of 0 and the operation of the brake actuator 19 of the parking brake safety device 60 described later are controlled.

The operation switch 10 is an on / off switch arranged around the driver, and when the operation switch 10 is turned on, the slope start assisting device 5 is provided.
0 is in an operable state, and when the operation switch 10 is turned off, the slope start assisting device 50 does not operate. Further, the adjustment switch 11 is for adjusting the operation of the slope start assisting device 50, and is a switch for adjusting the timing of releasing the brake fluid pressure from the held state.

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

The neutral switch 14 is provided as a shift position detecting means for detecting the shift position of the transmission, and the neutral switch 14 outputs an ON signal only when the shift position of the transmission is in neutral. Has become. The stop lamp switch 15 is provided as a service brake operating member operating state detecting means. That is, this stop lamp switch 15
Detects the operating 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.

The parking switch (parking brake operating member operating state detecting means) 16 detects the operating state of the parking brake operating member (ie, parking brake lever, not shown), and the operating position of this brake lever. The operating state of the parking brake is detected based on the. The door switch 17 is for the vehicle 1
Is a sensor capable of detecting the open / closed state of the driver's seat side door, and is also a key switch (engine operating state detecting means) 18
Indicates that 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).

As shown in FIG. 2, the controller 9
An alarm lamp 20 and an alarm buzzer 21 are connected to the driver, and when the operating condition of the slope start assist device 50 and the condition of the vehicle 1 meet predetermined conditions, an alarm is issued to the driver. . Note that this will be described later. Now, the parking brake safety device 60 will be described next. The parking brake safety device 60 will not operate the driver 1 after stopping the vehicle 1 under a predetermined condition. When the vehicle starts moving, it operates to stop the vehicle 1.

That is, this parking brake safety device 60
For example, when the vehicle 1 starts to move naturally due to gravity or the like when the vehicle is parked on a slope without sufficiently pulling the parking brake lever, this is detected to mechanically increase the brake fluid pressure. The rear wheel brake 3 is activated. Therefore, as shown in FIG. 2, between the magnet valve 7 of the brake fluid pressure supply system 6 on the rear wheel side and the rear wheel brake 3, a brake actuator (fluid pressure increasing mechanism) capable of adjusting the brake fluid pressure is provided. 19 are provided.

The brake actuator 19 operates in response to an operation command from the controller 9 described above. In the controller 9, each of the sensors 1 described above is operated.
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-mentioned brake actuator 19 will be described in detail with reference to FIG.
Is mainly composed of an actuate portion 22, a casing (actuator housing portion) 23, a hydraulic chamber (fluid pressure generating chamber) 24, and a piston (pressure increasing member or piston member) 25.

The actuating section 22 is a rotary drive section for generating a rotational force, and in this case, the actuating section 22.
Is composed of a motor (electric motor). The motor 22 is attached to the casing 23 and receives a command signal from the controller 9 to rotate. Further, as shown in FIG. 3, a space 23A is formed in the casing 23, and the space 2
A piston 25 is arranged at 3A. A hydraulic chamber 24 is formed in the space 23A by the piston 25 and the casing 23, and 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. Then, the hydraulic pressure to the brake actuating member side (for example, brake shoe or brake pad) 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 screw mechanism 28
By the action of, the position of the piston 25 is moved. That is, the screw mechanism 28 includes a male screw portion 22A attached to the rotating portion of the motor 22 and the male screw portion 2A.
It has a spacer 27 with a female screw 27A that is screwed into 2A, and when the motor 22 is rotated to increase the brake fluid pressure, the male screw portion 22A is rotated according to the rotational force of the motor 22.
Rotates to move the spacer 27 forward. Then, when the spacer 27 advances by a predetermined amount, it comes into contact with the piston 25, and thereafter, the spacer 27 and the piston 25 integrally move forward.

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.
This is to prevent the female screw 27A and the female screw 27A from being caught, and thereby the spacer 27 can be smoothly retracted. In addition, in the hydraulic chamber 24,
A second spring (return spring) 31 that biases the piston 25 against the biasing force of the first spring 26 is provided. This is for promptly retracting the piston 25 without generating residual pressure in the hydraulic chamber 24 when the spacer 22 is retracted by operating the motor 22.

By the way, the hydraulic chamber 24 of the actuator 19 communicates with the hydraulic pressure supply system 6 on the master cylinder 5 side so as to supply the brake oil to the hydraulic chamber 24. A second communication port 30 that communicates with the brake fluid pressure supply system 6 on the (brake shoe or brake pad) side and supplies the brake oil adjusted to a predetermined hydraulic pressure in the hydraulic chamber 24 to the brake operating member side is formed. Has been done.

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 fluid pressure, the above-mentioned first volume is used. The first communication port 29 is closed by the valve mechanism 32, so that 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 to the right in the figure. In such a case, the brake oil from the master cylinder 5 side passes 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 operates 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, piston 25 and check ball 32
The vertical movement of the valve 32B is restricted by A and
The communication port 29 is blocked by the check ball 32A, and the brake oil is not supplied from the master cylinder 5 side.

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

As shown in FIG. 1, the controller 9 as the control means controls the operation of the hill start assisting device control means 51 for controlling the operation of the hill start assisting device 50 and the operation of the parking brake safety device 60. And a parking brake safety device control means 61 for the purpose. Then, the slope start assist device control means 51 controls the operation start controller 5
2, the operation release controller 53, the operation alarm controller 54 and the drivers 55 and 56 are provided, and 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 the start of 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 issuing an operation alarm. The above-mentioned magnet valve 7, alarm lamp 20, and alarm buzzer 21 are connected to the slope start assist device control means 51, and these magnet valves are controlled based on the control signals output from the drivers 55 and 56. 7 and 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 is
Of 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, and the operation start controller 52 detects when the following three vehicle states are detected by these sensors 12 to 15 and assists in starting 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 is stepped on for a predetermined time (for example, 1 sec) or more. 2. Vehicle speed = 0 by vehicle speed sensor 13 (that is, the vehicle is stopped)
When is detected. 3. The clutch sensor 12 detects that the clutch pedal is depressed, or the neutral switch 1
When it is detected by 4 that the gear position is in the neutral position.

When all of the above three conditions 1 to 3 are satisfied, the operation start controller 52 considers that the driver keeps the vehicle 1 stopped, and starts up the slope. The control signal for operating the auxiliary device 50 is set, and the 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 brake fluid pressure supply system 6 on the front wheel side and the brake fluid pressure supply system 6 on the rear wheel side is switched on and the brake fluid pressure is contained. is there.

In this way, when the hill start assisting device 50 is operated, the vehicle 1 is stopped even if the brake pedal 4 is not continuously depressed when the vehicle is stopped on a hill or when traffic is congested. Fatigue is reduced. The 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 operation release controller 53 is connected with the clutch sensor 12, the neutral switch 14, and the parking switch 16, and the operation release controller 53 is based on the detection information from the sensors 12, 14, 16. Then, 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 is operated other than neutral, and in addition to this, 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 the above item 4, 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. Yes, in this case, the driver 55
This release signal is output from the magnet valve 7 to the magnet valve 7. In the case of 5, the vehicle 1 will be kept stopped by the parking brake.
The operation release controller 53 determines that it is not necessary 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, if another predetermined condition is satisfied, the parking brake safety device 60 described above operates to reliably keep the vehicle 1 in the stopped state, which 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 set to the driver 55.
Is output to the magnet valve 7, and thereby the magnet valve 7 is switched off. Therefore, when the vehicle 1 is started, the driver can start the vehicle 1 by operating the accelerator pedal and the clutch pedal without operating the brake pedal 4. At times, the vehicle 1 can be easily started.

When the parking brake is operated (case 5 above), the vehicle 1 is often stopped for a relatively long time. Therefore, the operation of the slope start assisting device 50 is canceled 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 is eliminated. The adjustment switch 11 is also connected to the operation release controller 53, and the operation release timing of the slope start assist device 50 can be adjusted by operating the adjustment switch 11.

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

6. When it is detected by the parking switch 16 and the door switch 17 that the door is opened without pulling the parking brake lever. 7. When the parking switch 16 and the key switch 18 detect the stop of the engine without pulling the parking brake lever. In the case of the above item 6, the deactivation controller 53 determines that the driver is leaving the vehicle 1 without setting the parking brake and sets an alarm signal, and the driver 56 causes the alarm lamp 20 and the alarm buzzer 21 to operate. This alarm signal is output. Then, the alarm lamp 20 and the alarm buzzer 21 are activated by this, and the driver is alerted.

In addition to the above cases 6 and 7, when it is detected that an abnormality has occurred in the slope start assist device 50, the alarm lamp 20 and the alarm buzzer 21 are activated in the same manner as above. , To alert the driver. As described above, by providing the vehicle 1 with the slope start assist device 50, it is possible to greatly reduce the fatigue of the driver when the start and stop are frequently repeated.
It becomes possible to safely and reliably start on a slope.

Next, parking brake safety device control means 61
As described above, the parking brake safety device control means 61 includes the operation start controller 6 as described above.
2, deactivation controller 63, timer (timer means)
65 and drivers 66 and 67. The above-described 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 canceling the operation. The timer 65 will be described later.

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

Here, the parking brake safety device control means 6
The operation start controller 62 of No. 1 will be described. The operation start controller 62 sends a control signal for operating the parking brake safety device 60 when a predetermined vehicle speed is detected although the parking brake is in operation. It is supposed to be set. 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, and the operation start controller 62 uses these sensors 13, 14,
When any of the following vehicle states 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. Even when the parking switch 16 detects that the parking brake is operating, when the vehicle speed sensor 13 detects a predetermined vehicle speed, the key switch 18 operates the engine. Is detected, and the neutral switch 14 detects that the shift position is the neutral position. 9. When the parking switch 16 detects that the parking brake is in operation, but the vehicle speed sensor 13 detects a predetermined vehicle speed, the key switch 18 indicates that the engine is not operating. When detected.

In cases 8 and 9 as described above, the operation start controller 62 determines that the vehicle 1 has started to move naturally due to the slope of the slope, etc., even though the vehicle is stopped by the parking brake. Parking brake safety device 60 from driver 66 to brake actuator 19
The control signal for operating the 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 to increase the braking force of the vehicle 1 and stop the vehicle 1. It is like this. As described above, in the parking brake safety device 60, when the vehicle 1 naturally moves during parking on a slope or the like, the brake actuator 19 is operated to increase the brake fluid pressure, thereby ensuring the safety of the parked vehicle 1. Of.

At this time, the driver 67 outputs a signal for blinking the parking brake lamp 33 to inform the driver that the parking brake safety device 60 is in operation. 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, 1 hour) has elapsed while the vehicle 1 is stopped, the time switch signal from the timer 65 is received and the vehicle speed sensor power switch 64 is turned off. 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.

As a result, the monitoring posture of the vehicle 1 by the operation start controller 62 is released. Further, in this case, the parking brake lamp 33 from the driver 67
The blinking signal of is also turned off to inform the driver that the operation of the parking brake safety device 60 has been turned off. When the timer 65 detects that the stopped state of the vehicle 1 has continued for a predetermined time after the engine is deactivated, the power supply to the vehicle speed sensor 13 is cut off, and the parking brake safety is further increased. 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, it is possible that the battery goes up if the operation start controller 62 is kept in the on state during long-time parking. Is. In addition, the vehicle 1
If it is not detected that the vehicle has started moving, that is, if the stopped state of the vehicle 1 continues for one hour in this example, it means that the parking brake is sufficiently operated and the parking safety is secured. Because it can be considered.

In the timer 65, the timer 65 is reset by the timer reset means (not shown) while the engine is operating by the key switch 18. In addition, the operation start controller 62
Similarly to the operation start controller 52 of the slope start assist device control means 51, the operation switch 10 is also connected, and by turning off this operation switch, the control signal also set by the operation start controller 62 is transmitted. It is possible to cancel.

On the other hand, parking brake safety device control means 61
The parking switch 16 is connected to the operation release controller 63 of 1., and the operation release controller 63 releases the operation of the parking brake safety device 60 based on the detection information from the parking switch 16 in the following case 10. The control signal to be set is set. 10. It is detected that the parking switch 16 operates the parking brake lever so that the operation position of the brake lever becomes the parking brake release position and the parking brake release operation is performed (that is, the non-operation of the parking brake is detected. If).

This is to prevent the parking brake safety device 60 from being used in place of the parking brake by releasing the parking brake after the parking brake safety device 60 is activated. That is, the present device 60 applies a braking force to the vehicle 1 to protect the surrounding safety when the vehicle 1 starts to move even though the parking brake is operated, and therefore the parking brake is released. Then, the operation of the parking brake safety device 60 is released so that the parking brake is always activated when the parking brake safety device 60 is activated.

This prevents the parking brake safety device 60 from being used in place of the parking brake,
The safety when the vehicle is parked is further enhanced.
When the parking brake is operating and the engine is operating and the shift position is the neutral position, or when the parking brake is operating and the engine is not operating, the vehicle speed is detected and the actuator 19 is detected. However, even if the parking brake is released when the vehicle speed is not detected in this standby state, the parking brake safety device 60 will still operate. The monitoring system (standby state) is released and normal running can be performed.

In the above case 10, when the operation release signal is set by the operation release controller 63, the driver 6
This operation release signal is output from 6 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 the flowchart shown in FIG. 4, for example.

Here, the flowchart shown in FIG. 4 will be briefly described. First, in step S1, the vehicle speed sensor 13
When the stop of the vehicle 1 is detected by, the process proceeds to step S2, and the parking switch 16 detects the operation of the parking brake. Next, in step S3,
The parking brake switch 16 determines whether or not the parking brake is released from the parking brake lever operation position.

When the vehicle speed sensor 13 detects that the vehicle 1 has started to move in step S4, the key switch 18 detects that the engine is operating and the neutral switch 14 operates in step S5.
Detects that the shift position is in the neutral position,
Alternatively, when the operating condition that the key switch 18 detects that the engine is not operating (the gear shift position of the transmission is arbitrary) is satisfied in step S6, the brake actuator 1 is operated in step S7.
9 is activated to increase the brake fluid pressure.

Then, the rear wheel brake 3 is operated in step S8, and the parking brake lamp 33 is operated in step S9 to notify the driver of the operation of the parking brake safety device 60. The operation of the brake actuator 19 when the parking brake safety device 60 operates will be described with reference to FIG. 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, the motor 22 first 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. Then, after this, the spacer 27 abuts on the piston 25 and integrally moves forward to reduce the volume of the hydraulic chamber 24. At this time, it is possible to supply the brake oil to the hydraulic chamber 24 by communicating with the hydraulic pressure supply system 6 on the master cylinder 5 side.
The communication port 29 is closed by the valve mechanism 32. That is, when the piston 25 moves forward, the valve 32B in the valve mechanism 32
The upper end of the valve responds to the movement of the piston 25, and the valve 32B becomes substantially vertical.
The vertical movement of the valve 32B is restricted by A and
The communication port 29 is blocked by the check ball 32A, and the brake oil is no longer 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 side in the brake hydraulic pressure supply system 6 increases, and the vehicle 1 Therefore, a larger braking force acts. Then, after that, the hydraulic reaction force acting on the motor 22 increases, which increases the current of the motor 22, and when this current value exceeds a predetermined value, the controller 9
Turns off the power supply to the motor 22. In this way, even if the operation of the motor 22 is stopped, after that, the position of the piston 25 is fixed by the frictional force between the female screw 27A of the spacer 27 and the male screw portion 22A and the contact portion. Can be easily held.

As described above, at this time, the driver 67 outputs a signal for blinking the parking brake lamp 33 to inform the driver that the parking brake safety device 60 is operating. The operation of the brake actuator 19 when the parking brake safety device 60 is deactivated will be described with reference to FIG.

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 reversely rotates and the male screw of the screw mechanism 28 is rotated. The part 22A is rotated in the reverse direction. As a result, the spacer 27 with the female screw 27A retracts while receiving the biasing force of the first spring 26. At this time, the piston 25 retracts due to the action of the hydraulic reaction force in the hydraulic chamber 24 and the urging force of the return spring 31 arranged in the hydraulic chamber 24, and the piston 25 and the brake actuator 19 in the brake hydraulic pressure supply system 6 The hydraulic pressure between the brake operating member side is reduced.

At this time, the first communication port 29 and the hydraulic chamber 24 are in communication with each other. That is, when the piston 25 retracts, the upper end of the valve 32B is locked by 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 should be checked. The ball 32A, the valve 32B, and the communication hole 25A formed at the tip of the piston 25 communicate with the first communication port 29.

Therefore, the brake fluid pressure to the brake operating member side of the rear wheel brake 3 is released, and the braking force is not exerted. When the brake fluid pressure is released, the motor 22 is turned off. Further, 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 and a reverse torque is generated in the motor 22.
8 is performed so that the female screw 27 of the spacer 27
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 braking device using the brake actuator 19, the hill start assisting device 50 is actuated to maintain the braking force even when the foot is released from the brake pedal 4 at the time of a temporary stop such as a signal waiting or a traffic jam. By so doing, it is possible to reduce the fatigue of the driver and also to easily start on a slope. on the other hand,
When the parking brake is operated and the vehicle 1 is parked and parked, if the engine is operating and the shift position is the neutral position, or if the engine is not operating and the shift position is arbitrary, the parking brake safety device is provided. 60 is activated. As a result, the vehicle 1 can be operated even if no operation is performed on a slope or the like.
When the vehicle starts to move, the brake actuator 19 operates to increase the brake fluid pressure, and the safety of the vehicle 1 parked and stopped is ensured.

When it is detected by the parking switch 16 that the parking brake lever is operated and the parking brake is released, the operation release controller 63 sets an operation release signal and sets the driver 66.
Outputs this operation release signal to the brake actuator 19. This prevents the parking brake safety device 60 from operating in place of the parking brake, because the parking brake safety device 60 will not operate unless the parking brake lever is in the actuated position. Further, in order to operate the parking brake safety device 60, it is necessary to operate the parking brake, so that the safety when the vehicle is parked is further enhanced.

In addition, the driver has the parking brake safety device 60.
Even if the vehicle 1 is not aware of the deactivation, the operation of the device 60 is automatically released when the vehicle 1 is operated to start the vehicle 1. Therefore, when the parking brake safety device 60 is operated, the vehicle 1 is deactivated. There is an advantage that an unreasonable force is not applied to the engine, the drive system, the brake device, etc. even if the vehicle is started.

The releasing operation is executed by operating the brake actuator 19 in the opposite manner to reduce the brake fluid pressure. Further, the parking switch 16 detects the operating state of the parking brake based on the operating position of the parking brake lever, whereby the operating state of the parking brake can be detected easily and reliably. Further, there is an effect that the operating state of the parking brake can be detected at low cost.

Since the first spring 26 is interposed between the piston 25 and the spacer 27 in the brake actuator 19 as described above, the piston 25
The male screw 2 when the brake is moved forward (when the brake fluid pressure increases).
2A and the female screw 27A are prevented from biting each other, so that even when the motor 22 is reversely rotated in order to reduce the brake fluid pressure, the motor 22 smoothly reversely rotates to ensure the piston 25 and the spacer 27. Can be retracted.

In the hydraulic chamber 24 of the brake actuator 19, the piston 2 is resisted against the urging force of the first spring 26.
By providing the second spring 31 for urging the piston 5, the piston 25 can be quickly retracted without generating residual pressure in the hydraulic chamber 24 when the spacer 27 is retracted. When the parking brake safety device 60 is activated when the engine is off, the timer 65 is triggered to start the counting. Then, the vehicle 65 is stopped by the timer 65 for a predetermined time (for example, 1
When it is detected that the time has elapsed, it is determined that the parking brake is sufficiently operated and the safety of parking is ensured, and the vehicle speed sensor power switch 64 and the system power switch 64A are turned off. The vehicle speed sensor 13 and the parking brake safety device control means 61 are turned off. Further, 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, it is possible to suppress unnecessary power consumption by the vehicle speed sensor 13 and prevent the battery from running down. Further, in the timer 65, the timer 65 is reset by the timer reset means (not shown) while the engine is operating by the key switch 18, so that the predetermined time can be reliably counted only when the engine is inactive. be able to.

Further, when the parking brake safety device 60 is in operation, the parking brake lamp 33 blinks based on the output signal from the driver 67, so that the parking brake safety device 60 can surely inform the driver of the operation. it can. The brake actuator 19 may have a structure as shown in FIG. 7, for example, in addition to the structure 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 screw, a piston 25A with a female screw and a male screw portion 22A. When the motor 22 is rotated, the male screw portion 22A is rotated. Is rotated, the collar member 34 and the piston 25A are directly moved forward and backward. That is, here, in FIG.
The first spring 26 as shown in (3) is eliminated, and the responsiveness of the actuator 19 can be improved by moving the piston 25A forward and backward directly by the motor 22.

Further, since the piston 25A can be directly retracted by rotating the motor 22 in the reverse direction,
It is not necessary to provide a return spring (see reference numeral 31 in FIG. 3) in the hydraulic chamber 24, and the number of parts 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 those in FIG. 3 is omitted.

By the way, the brake actuator 19 does not necessarily have to be provided in the brake fluid pressure supply system 6 on the rear wheel side, but may be provided, for example, in the brake fluid pressure supply system 6 on the front wheel side. Furthermore, the front wheel brake actuator and the rear wheel brake actuator, which are independently configured, may be provided in the front wheel side and rear wheel side brake fluid pressure supply systems 6, respectively. With such a configuration, it is possible to more reliably ensure safety when the vehicle is parked.

[0081]

As described in detail above, according to the parking brake safety device of the present invention as set forth in claim 1, in a vehicle equipped with a parking brake, a vehicle with wheels is provided in response to the operation of the service brake operating member. A brake working fluid supply system for supplying a brake working fluid of a required pressure to a service brake working member, and a fluid pressure of a portion of the brake working fluid supply system, which is interposed between the brake working fluid supply system and A parking brake operating state detecting means for detecting an operating state of the parking brake, a vehicle speed detecting means for detecting a vehicle speed, and a parking brake operating state detecting means and a vehicle speed detecting means. Based on the detection result of the above, if the predetermined vehicle speed is detected on the assumption that the parking brake is in operation, the brake operation is started. The fluid pressure of the service brake operating member side portion in the body supply system is increased, and when the parking brake is deactivated based on the parking brake operating state detecting means, the fluid pressure of the service brake operating member side portion is increased. The advantage that the parking brake safety device is prevented from being used in place of the parking brake due to the configuration in which the control means for controlling the fluid pressure increasing mechanism is provided so as to release the fluid pressure state and reduce the fluid pressure. There is. Further, since it is necessary to operate the parking brake in order to operate the parking brake safety device, it is possible to further enhance the safety when the vehicle is parked. In addition, even if the driver is not aware of the deactivation of the parking brake safety device, the parking brake safety device is automatically deactivated when the parking brake is released to start the vehicle. Even if the vehicle is started when the parking brake safety device is operated, there is an advantage that an unreasonable force is not applied to the engine, the drive system, the brake device and the like.

According to the parking brake safety device of the present invention as set forth in claim 2, in addition to the structure of claim 2, the parking brake operating state detecting means determines the operating state of the parking brake. By being configured to detect from the operating position of, there is an advantage that the operating state of the parking brake can be detected easily and reliably. Further, there is an effect that the operating state of the parking brake can be detected at low cost.

[Brief description of drawings]

FIG. 1 is a schematic control block diagram showing an overall configuration of a control system in a parking brake safety device as an 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 configuration of 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 diagram for briefly explaining the operation of the 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 releasing operation in the brake actuator in the parking brake safety device as one embodiment of the present invention.

FIG. 7 is a schematic cross-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]

1 Vehicle 2 Front Wheel Brake (Front Wheel Brake) 3 Rear Wheel Brake (Rear Wheel Brake) 4 Brake Pedal (Service Brake Operation Member) 5 Master Cylinder 6 Brake Fluid Pressure Supply System (Brake Actuating Incompressible Fluid Supply System) 7 Switching valve (magnet valve) 8 LSV (load sensing valve) 9 Controller as control means 9 10 Actuation switch 11 Adjustment switch 12 Clutch pedal stroke sensor (or clutch sensor) 13 Vehicle speed sensor (active 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 state detecting means) 17 Door switch 18 Key switch (engine Dynamic state detecting means) 19 Brake actuator (fluid pressure increasing mechanism) 20 Alarm lamp 21 Alarm buzzer 22 Motor (actuate part) 22A Male screw part 23 Casing (actuator housing part) 23A Space part 24 Hydraulic chamber (hydraulic pressure generating chamber) ) 25 piston (pressure increasing member or piston member) 25A communication hole 26 first spring 27 female screw 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 brake safety Installation 61 Parking brake safety device control means 62 Operation start controller (first control means) 63 Operation release controller (second control means) 64 Vehicle speed sensor power cutoff switch (cutoff means) 64A System power switch 65 Timer means 66, 67 Driver 68 Battery 69 Rubber cup

Claims (2)

[Claims] 1. In a vehicle equipped with a parking brake, a brake working fluid supply system for supplying 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 parking brake which is provided in the working fluid supply system and has a fluid pressure increasing mechanism capable of increasing the fluid pressure of the service brake operating member side portion of the brake working fluid supply system, and which detects the operating state of the parking brake. Based on the detection results of the operating state detecting means, the vehicle speed detecting means for detecting the vehicle speed, and the parking brake operating state detecting means and the vehicle speed detecting means, a predetermined vehicle speed is assumed on the assumption that the parking brake is operating. Is detected, the fluid pressure of the service brake operating member side portion of the brake operating fluid supply system is increased. Moni, based on the parking brake operating state detecting means, when the parking brake is deactivated, by releasing the state in which increased fluid pressure in the service brake actuating member side portion to reduce the fluid pressure,
A parking brake safety device comprising a control means for controlling the fluid pressure increasing mechanism. 2. The parking brake safety according to claim 1, wherein the parking brake operating state detecting means is configured to detect an operating state of the parking brake from an operating position of a parking brake operating member. apparatus.