JPH08295212A - Parking brake safety device - Google Patents

Abstract

PURPOSE: To inform a driver of the case that a parking brake safety device is operated when the driver leaves from a vehicle, a relating to the parking brake safety device provided in order to ensure safety of the vehicle during parking. CONSTITUTION: In a vehicle provided with a parking brake, the constitution is formed such that a brake assist drive means 125, parking brake operating condition detecting means 16, car speed detecting means 13 and a control means 9 of controlling operating of the brake assist drive means 125 in a system-on state are provided also to provide an alarm generating means 181 of operating an alarm member 180 after a lapse of prescribed time from this system-on state by triggering a timer 65A.

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. For example, in Japanese Unexamined Patent Publication No. 64-67452, when it is detected that the vehicle starts to move when the engine is stopped, the brake is actuated,
A technique for preventing the vehicle from moving freely and maintaining safety is disclosed.

[0003]

However, if the vehicle starts moving and the above parking brake safety device operates while the driver is away from the parked vehicle, the driver may not be aware of this. In such a case, if the vehicle is parked as it is, the vehicle may start to move again due to a decrease in battery capacity or the like.

The present invention was devised in view of the above problems, and when the parking brake safety device is activated while the driver is away from the vehicle, the parking brake can be notified to the driver. The purpose is to provide a safety device.

[0005]

Therefore, the parking brake safety device of the present invention according to the first aspect of the present invention, in a vehicle equipped with a parking brake, applies a braking force to the wheels independently of the operation of the driver. Controllable brake auxiliary drive means, parking brake operating state detecting means for detecting the operating state of the parking brake, vehicle speed detecting means for detecting vehicle speed, and parking brake operating state detecting means and vehicle speed detecting means When a predetermined vehicle speed is detected based on the detection result of the above, even though the parking brake is in operation, the operation of the brake auxiliary drive means is controlled to the system-on state so as to increase the braking force to the wheel. And a control means for controlling the system to turn on the system when the system is turned on by the control means. When but passed, it is characterized in that the alarm generating means for actuating an alarm member is provided.

Further, in the parking brake safety device according to a second aspect of the present invention, in addition to the configuration according to the first aspect, the alarm generating means is controlled by the control means after the engine mounted on the vehicle is turned off. When the system is turned on, a timer is triggered, and when a predetermined time elapses from the system turned on, the horn sounds.

Further, in the parking brake safety device according to a third aspect of the present invention, in addition to the configuration according to the first aspect, the alarm generating means is configured as a means for intermittently activating the alarm member. Is characterized by. Further, in the parking brake safety device according to a fourth aspect of the present invention, in addition to the configuration according to the first aspect, when the system is turned on by the control means, a predetermined time elapses from the system on state. Before the operation, when the system is turned off by the control means, the timer is reset so that the alarm member is prohibited from operating even if a predetermined time has elapsed from the system on state. It is characterized in that a releasing means is provided.

[0008]

In the parking brake safety device according to the first aspect of the present invention described above, the vehicle speed detecting means detects the parking brake even if the parking brake operating state detecting means detects that the parking brake is in operation. When the predetermined vehicle speed is detected based on the result, the control means controls the operation of the brake assist drive means to the system-on state. As a result, the brake assist drive unit increases the braking force applied to the wheels independently of the driver's operation.

Then, when the system is turned on by the control means, the timer is triggered, and when a predetermined time elapses from the system on state, the alarm generating means activates the alarm member to issue an alarm to the surroundings. Further, in the parking brake safety device of the present invention according to claim 2 described above,
When the control means brings the system on after the engine is turned off, the timer is triggered by the alarm generating means. Then, after a lapse of a predetermined time from the system-on state, the alarm generation means causes the horn to ring.

Further, in the parking brake safety device according to the third aspect of the present invention, when the alarm generating means is activated, the alarm member is intermittently activated to inform the surroundings that the system is on. Further, in the parking brake safety device of the present invention as set forth in claim 4, when the control means controls the system to be in the system-off state before a predetermined time has elapsed, the alarm-generation canceling means causes
Even if a predetermined time has elapsed since the timer was reset and the system was turned on, the alarm member is prohibited from operating.
As a result, the alarm member does not operate in the system off state.

[0011]

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 structure, and FIG. 2 is a schematic view showing the overall structure. FIG. 3 is a schematic sectional view of a solenoid valve as the actuator, FIG. 3A is a schematic diagram for briefly explaining the structure of the solenoid valve, and FIG. FIG. 4C is a schematic diagram for explaining the operation when the operation is released, FIG. 4 is a schematic configuration diagram focusing on the abnormality detection function, and FIG. FIG. 6 is a flow chart for briefly explaining the operation of the main part thereof.

(1) Description of Overall Structure The brake device shown in FIG. 2 uses a service brake that uses air pressure as a control pressure (such a service brake is referred to as an air-over-hydraulic brake, and is simply referred to as an air brake hereinafter). The brake device of the vehicle is mainly composed of this air brake and a parking brake (parking brake) not shown.

A brake actuation air supply system (hereinafter, simply referred to as an air supply system) is supplied to the air brake in response to an operation of a brake pedal (service brake operation member) 4 to supply a brake actuation air of a required pressure. 6) is provided and receives the brake operating air from the air supply system 6 and is connected to the brake fluid pressure supply system for the front wheels and the brake fluid pressure supply system for the rear wheels (both not shown). The master cylinders 5A and 5B are operated to generate braking force on the vehicle.

That is, in the air supply system 6 of this service brake, as shown in FIG.
Or an air tank 81 as an air source is connected,
When the driver steps on the brake pedal 4, the brake valve 8
0 is opened and the high pressure air in the air tank 81 is released. As a result, the high pressure air is supplied to the air supply passage 8
It is supplied to the master cylinders 5A and 5B via Nos. 2, 83 and a magnet valve 7 described later.

When the master cylinders 5A and 5B are actuated by the action of this high pressure air, the hydraulic pressure of the brake oil in the brake fluid pressure supply system on the front and rear wheels is increased, and the service brake is activated. Members (brake shoes and brake pads) are activated to generate a braking force on the vehicle. By the way, the brake device shown in FIG. 2 is provided with a slope start assist device 50 and a parking brake safety device 60.
When 0 and 60 interact with each other, the vehicle can be easily started on a slope and the safety of the parked vehicle can be ensured.

(1.1) Description of Slope Start Assist Device Among these, first, the slope start assist device 50 will be described. The slope start assist device 50 stops the vehicle by depressing the brake pedal 4 shown in FIG. When it is detected that the driver has stepped on the brake pedal 4 and the vehicle has stopped for a predetermined time or more, the air supply system 6 is activated.
The magnetic valve 7 provided in each of the air supply paths 82 and 83 is switched to enclose high-pressure air in the air supply system 6 downstream of the magnet valve 7, and the driver releases the brake pedal 4 from the foot. Is like holding a braking force.

By the way, the above-mentioned slope start assisting device 50.
The magnet valve 7 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,
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 state detecting means) 16, door switch 17 and key as engine operating state detecting means. The switch 18 is connected, and the operation of the magnet valve 7 is controlled based on the detection information from these sensors.

Here, 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 assist device 5 is turned on.
When the operation switch 10 is turned off, the slope starting assist device 50 does not operate. Further, the adjustment switch 11 is provided on the slope starting assist device 50.
Is a switch for adjusting the timing of releasing the operation of the magnet valve 7.

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 power supply from the battery 68 via 4 (see FIG. 1).

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 state detecting means) 16 is a switch for detecting the operating state of the parking brake operating member (ie, parking brake lever, not shown), and the operation of this parking brake lever is performed. The operating state of the parking brake is detected based on the position. Door switch 1
Reference numeral 7 denotes a sensor capable of detecting the open / closed state of the door on the driver's side of the vehicle, and a key switch (engine operating state detecting means) 18 is used when the engine (not shown) is operating (when the engine is on) or Is inactive (engine off)
It is a sensor that detects whether or not.

As shown in FIG. 2, the controller 9
An alarm lamp 20 and an alarm buzzer 21 are connected to the vehicle so that an alarm is issued to the driver when the operating condition of the hill start assist device 50 and the condition of the vehicle meet predetermined conditions. Note that this will be described later. And
The controller 9 sets the on / off control signal of the magnet valve 7 based on the detection information of the sensors 10 to 18 and outputs it to the magnet valve 7.

(1.2) Description of Parking Brake Safety Device Next, the parking brake safety device 60 of the present invention will be described. This parking brake safety device 60 is provided after stopping the vehicle under predetermined conditions. When the vehicle starts moving without any operation by the driver, it operates to stop the vehicle.

That is, this parking brake safety device 60
For example, if the vehicle starts to move naturally due to gravity or the like when the vehicle is parked on a slope without fully pulling the parking brake lever, this is detected to increase the brake fluid pressure and mechanically increase the brake pressure on the rear side. The service brake of is activated.

For this reason, as shown in FIG. 2, the air tank 81 is provided between the rear side master cylinder 5B and the downstream side of the magnet valve 7 in the rear wheel side air supply passage 83.
An auxiliary air supply passage 84 that can supply high-pressure air from A check valve 87 and a solenoid valve (fluid pressure increasing mechanism) 90 as an actuator are provided on the auxiliary air supply passage 84 from the upstream side. By controlling the operating state of the solenoid valve 90, It automatically increases the braking force of the vehicle.

The service brake auxiliary drive means 1 is constructed by the solenoid valve 90 and the auxiliary air supply passage 84.
25 are configured. The above-mentioned check valve 8
As shown in the figure, 7 is a check valve that allows only the high pressure air from the air tank 81 to flow to the downstream side.
Here, the structure of the solenoid valve 90 will be described with reference to FIG. 3A.
0 is mainly the first valve body 91, the second valve body 92, the plunger 93 made of a magnetic material, the solenoid 99, the first magnet 96 and the second.
It is composed of a magnet 97.

Further, the solenoid valve 90 has an air inlet 9 for taking in pressurized air from the air tank 81.
8A, an air feed port 98B for feeding the pressurized air to the master cylinder 5B, and an air discharge port 98C for opening the air fed to the master cylinder 5B to the atmosphere. The air intake 98A and the air supply port 9
8B is opened and closed by the first valve body 91, and the passage between the air supply port 98B and the air discharge port 98C is opened and closed by the second valve body 92. ing.

The first valve body 91 and the second valve body 92 are connected to the plunger 93, and the first valve body 91 and the second valve body 92 are operated according to the movement of the plunger 93. It is supposed to do. By the way, a solenoid 99 is provided around the plunger 93. The solenoid 99 includes a first solenoid (first solenoid portion) 94 and a second solenoid (second solenoid portion) 9
The first solenoid 94 and the second solenoid 94
The solenoid 95 is provided coaxially with the plunger 93.

A first magnet 96 and a second magnet 97 are provided below and above the plunger 93, respectively. The first magnet 96 and the second magnet 97 are permanent magnets. When the first solenoid 94 is energized, the magnetic plunger 93 is driven downward in the figure. At this time, the magnetic body plunger 93 is kept in that state by the magnetic force of the first magnet 96, and even when the first solenoid 94 is de-energized, the plunger 93 is shown in FIG. 3B. It is designed to be held in such a downward position.

When the plunger 93 is driven downward as described above and the state is maintained, the first valve body 91
The air intake port 98A and the air supply port 98B communicate with each other, and the second valve body 92 shuts off the air exhaust port 98B and the air exhaust port 98C. Pressurized air from the air intake 98
A is supplied to the master cylinder 5B through the air supply port 98B.

Therefore, in this case, the parking brake safety device 60 is in a state in which a large braking force is applied to the vehicle (system-on state). When the second solenoid 95 is energized, contrary to the above, the plunger 93 is driven upward in the figure. At this time, the magnetic body plunger 93 is kept in that state by the magnetic force of the second magnet 97, and even when the second solenoid 95 is de-energized, the plunger 93 is still in the state shown in FIG.
It is adapted to be held in an upward state as shown in (c).

When the plunger 93 is driven upward to maintain its state, the first valve body 91 blocks the air intake 98A and the air supply port 98B, and 2 valve body 92 air feed port 98B
The air passage from the master cylinder 5B side is opened to the atmosphere through the air supply port 98B and the air exhaust port 98C. . Of course, at this time, the pressurized air from the air tank 81 is not supplied to the master cylinder 5B.

Therefore, in this case, the parking brake safety device 60 is in a non-operating state (that is, the parking brake safety device 60 is in the operation-released state, which is hereinafter referred to as the system-off state).

The controller 9 controls the operation of the parking brake safety device 60 by controlling the operation of the solenoid valve 90 based on the detection information from the sensors 10 to 18 described above. Of. As shown in FIG. 2, the double check valve 8 is provided between the solenoid valve 90 and the master cylinder 5B.
9 are provided. This double check valve 89
Is a select-high valve that opens one of the two air pressure supply paths having the higher air pressure and closes the other path having the lower air pressure. The high-pressure air supplied from the auxiliary air supply passage 84 is supplied to the master cylinder 5B via the double check valve 89.

(2) Description of Overall Structure of Control System By the way, as described above, the operations of the slope start assist device 50 and the parking brake safety device 60 are both controlled by the controller 9. But below
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, timers (timer means) 65, 65A, drivers 66, 67, an alarm generating means 181, and an alarm generating canceling means 182.

(2.1) Description of Control System of Slope Start Assist Device First, the slope start assist device control means 51 will be described. The operation start controller 52 is the slope start assist device 50.
A control unit for controlling the start of the operation of the
The operation alarm controller 54 is a control unit for controlling the operation alarm.

Then, the slope start assist device control means 5
1 includes the magnet valve 7 and the alarm lamp 20 described above.
And the alarm buzzer 21 are connected to the drivers 55, 5
The operation of the magnet valve 7, the alarm lamp 20, and the alarm buzzer 21 is controlled based on the control signal output from the control unit 6.

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 stationary, and assists in starting the slope. The control signal for operating the 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 air supply system 6 is switched on, and the high pressure air from the air tank 81 is contained between the master cylinders 5A and 5B and the magnet valve 7.

Therefore, the master cylinders 5A, 5B are kept in operation regardless of whether the brake valve 80 is turned on or off, and the brake fluid pressure is increased in the front and rear wheel side brake fluid pressure supply systems 40A, 40B. In this state, the braking force is maintained. Then, this keeps the vehicle stationary. As described above, when the slope start assist device 50 is operated, the vehicle is stopped without continuously pressing the brake pedal 4 when the vehicle is stopped on a slope or when the vehicle is congested. Therefore, fatigue of the driver is reduced. It is.

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. ing. On the other hand, a clutch sensor 12, a neutral switch 14, and a parking switch 16 are connected to the deactivation controller 53, and the deactivation controller 53 uses the following information based on the detection information from the sensors 12, 14, 16: When any one of the two states is detected, a control signal for canceling the operation of the slope starting assistance 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, the clutch sensor 12 detects that the clutch pedal is 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, and sets a control signal for releasing the operation of the slope start assisting device 50. In this case, the driver 55 outputs the release signal to the magnet valve 7. In the case of 5, the vehicle is kept stopped by the parking brake. Therefore, the deactivation controller 53 determines that it is not necessary to contain the high pressure air to stop the vehicle, and assists the start of the slope. The control signal for releasing the operation of the device 50 is set. In this case, if another predetermined condition is satisfied, the parking brake safety device 60 described above operates to reliably keep the vehicle in a 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 is started, the driver can start the vehicle by operating the accelerator pedal and the clutch pedal without operating the brake pedal 4, so that it is particularly easy to start the vehicle on a slope. You will be able to start the vehicle.

When the parking brake is operated (case 5 above), the vehicle is often stopped for a relatively long time. Therefore, the operation of the hill start assisting device 50 is released and the service brake is applied. It eliminates unnecessary load on. In addition, this operation release controller 5
An adjustment switch 11 is also connected to 3, 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 starting assistance device 50 will be described. The parking controller 16, the door switch 17, and the key switch 18 are connected to the release controller 53, and the slope starting 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 the parking switch 16 and the door switch 17 detect 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-mentioned item 6, the operation release controller 53 determines that the driver is about to leave the vehicle without operating the parking brake, sets an alarm signal, and causes the driver 56 to output the alarm lamp 20 and the alarm buzzer. This alarm signal is output to 21. 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 an abnormality is detected 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. In this way, by providing the vehicle with the slope start assisting device 50, when starting and stopping are frequently repeated,
Fatigue of the driver can be greatly reduced, and the driver can safely and reliably start on a slope.

(2.2) Description of Control System of Parking Brake Safety Device Next, the parking brake safety device control means 61 will be described. As described above, the parking brake safety device control means 61 includes the first control means. And an operation release controller 63 as second control means, an alarm generation means 181, an alarm generation release means 182, timers (timer means) 65, 65A, and drivers 66, 67.

The above-mentioned operation start controller 62 is a control unit for controlling the operation start of the parking brake safety device 60 to bring the system on state, and the operation release controller 63 releases the operation to bring the system off state. It is a control unit for doing.

In addition, as shown in FIGS. 1 and 2, the parking brake safety device control means 61 has a parking brake lamp 33 which is turned on when the parking brake is operated.
Is connected. The operation of the solenoid valve 90 and the parking brake lamp 33 is controlled based on the control signals output from the drivers 66 and 67 provided in the parking brake safety device control means 61.

Further, the parking brake safety device control means 6
1 has a horn 180 as an alarm member.
Is also connected, and the horn 180 sounds based on the control signal output from the alarm generating means 181.

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 solenoid valve 90 is controlled to supply the air pressure to the master cylinder 5B.

8. Even if the parking switch 16 detects that the parking brake is operating, the vehicle speed sensor 13 detects a predetermined vehicle speed and the key switch 18 operates the engine. When it is detected and the neutral switch 14 detects that the shift position is the neutral position. 9. Although the parking switch 16 detects that the parking brake is operating, the vehicle speed sensor 13 detects a predetermined vehicle speed, and the key switch 18 detects that the engine is not operating. When

In cases 8 and 9 as described above, the operation start controller 62 determines that the vehicle has started to move naturally due to the slope of the slope, etc., even though the vehicle is stopped by the parking brake. The driver 66 outputs a control signal to the solenoid valve 90 for operating the parking brake safety device 60.

As a result, the first solenoid valve 90
When the solenoid 94 is excited and the first valve body 91 connects the air intake port 98A and the air supply port 98B, the high pressure air from the air tank 81 is supplied to the auxiliary air supply passage 8
4 is supplied to the master cylinder 5B. And
Upon receiving this high-pressure air, the master cylinder 5B operates, and the brake fluid pressure is increased to increase the braking force of the vehicle, and the vehicle is automatically stopped.

Therefore, the parking brake safety device 60 can ensure the safety of the vehicle when the vehicle naturally starts to move when parked on a slope or the like. Further, at this time, the driver 67 outputs a signal for blinking the parking brake lamp 33, and the parking brake safety device 60 is output.
The driver is informed that the vehicle is operating.

In the case of 9 above, the key switch 1
When the engine 8 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 is stopped, the vehicle speed sensor power switch 64 is turned off in response to the time-up signal from the timer 65, and 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 vehicle monitoring system by the operation start controller 62 is released. Also, 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. When the timer 65 detects that the stopped state of the vehicle has continued for a predetermined period of time after the engine is deactivated, the power supply to the vehicle speed sensor 13 is shut off, and the parking brake safety device is further activated. The 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 conceivable that if the operation start controller 62 is left in the ON state during parking for a long time, the battery will run out. Is. Further, if it is not detected that the vehicle has started to move within a predetermined time set in advance, that is, in this example, if the stopped state of the vehicle has continued for one hour, the parking brake is operating sufficiently. It is considered that the safety of parking is ensured.

In the above timer 65, the timer 65 is reset by the timer reset means (not shown) while the engine is operating by the key switch 18. By the way, when the vehicle starts moving and the parking brake safety device 60 is in the system-on state while the driver is away from the parked vehicle, the driver may not notice this unless some notification is given. is there.

Then, the driver sets the parking brake safety device 6
When the vehicle is parked as it is without noticing the operation of 0, if air leakage occurs in the air supply system 6, the pressure of the brake working fluid (brake oil, air, etc.) decreases, and the vehicle is restarted. It is possible to start moving. In such a case, even if the driver is outside the vehicle compartment, the driver is notified that the parking brake safety device 60 is in the system-on state, and the vehicle is securely parked by re-parking the parking brake. I want to let you do it.

Therefore, the parking brake safety device 6 of the present invention.
At 0, when the controller 9 controls the parking brake safety device 60 to the system-on state, the timer 65
A is triggered to count the elapsed time from the system-on state, and when the timer 65A detects that a predetermined time t1 (for example, t1 = 1 minute) has elapsed from the system-on state, an alarm generation means. 181 operates to output a control signal to the alarm member (horn) 180.

Then, based on the control signal from the alarm generating means 181, the horn 180 sounds and the horn sound is emitted to the surroundings. As a result, the driver outside the vehicle compartment is informed of the operation of the parking brake safety device 60 and is prompted to perform an operation such as re-pulling the parking brake. The reason why the horn 180 does not ring until a predetermined time has elapsed even if the parking brake safety device 60 is in the system-on state is as follows.

That is, it is considered that the parking brake safety device 60 is activated (the system is turned on) relatively often immediately after parking, but in this case, there is a high possibility that the driver is still in the passenger compartment. . Further, the driver in the vehicle compartment can confirm the operation of the parking brake safety device 60 by blinking the parking brake lamp 33 as described above. In such a case, the horn 1
There is not much need to ring 80 to notify the operation of the parking brake safety device 60, and on the contrary, it may cause trouble to the neighborhood. For this reason, when the parking brake safety device 60 is in the system-on state for a predetermined time, the driver determines that the driver is away from the vehicle and causes the horn 180 to ring. .

Further, in the parking brake safety device 60, the alarm generating means 181 is constructed to intermittently ring the horn 180, whereby the driver turns on the system ON state of the parking brake safety device 60. It is possible to immediately determine whether or not the alarm sound is a notification. After that, in the timer 65A,
When the ringing time of the horn 180 is counted and the ringing time continues for a predetermined time t2 (for example, t2 = 1 minute), the alarm generation canceling means 182, which will be described later, causes the horn 1
The operation stop signal for stopping the ringing of 80 is output, and the ringing of the horn 180 is stopped.

The operation start controller 62 includes the operation start controller 5 of the slope start assist device control means 51.
The operation switch 10 is also connected in the same manner as 2, and the control signal set by the operation start controller 62 can also be canceled by turning off the operation switch.

On the other hand, 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 FIG.
Based on the detection information from 5, 16 below, 10.
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 to set the system to the off state, and the alarm generation releasing means 18
2, the timer 65A is reset to prohibit the horn 180 from ringing.

10. When the parking switch 16 detects that the parking brake lever has been released a predetermined number of times (for example, twice) in succession. 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).

That is, in order for the parking brake safety device 60 to be in the operating state, it is necessary to operate the parking brake as described in detail in Sections 8 and 9 above. It is a prerequisite that the parking brake is released as shown in 11. Explaining item 10 above, when releasing the parking brake safety device 60, when the driver continuously performs the parking brake releasing operation a plurality of times so that the driver intentionally does this, The parking brake safety device 60 is released.

That is, when the vehicle starts moving on a slope or the like, the parking brake safety device 60 operates to stop the vehicle instead of the parking brake. In such a case,
It is preferable to harden the parking brake again.
Then, if the parking brake can be reliably operated by operating the parking brake again, it is desired to cancel the operation of the parking brake safety device 60.

However, in such a case, in order to operate the parking brake again, it is conceivable that the brake lever is first returned and then the brake lever is strongly pulled again. Then, if the operation of the parking brake safety device 60 is released while the brake lever is once returned, the vehicle starts moving again. Therefore, in order to prevent this, the parking brake safety device 60 does not release the operation of the parking brake safety device 60 merely by releasing the operation of the parking brake, and then when the parking brake is activated again, the parking brake is activated. The operation of the brake safety device 60 is released.

As a result, even if the driver unconsciously releases the parking brake, the parking brake safety device 60 is not released, and the safety of the vehicle during parking is ensured. 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 is detected when the vehicle speed is detected. The parking brake safety device 60 is in a standby state such that the safety device 60 operates (above, 8 and 9), but while the vehicle speed is not detected in this standby state, one release operation of the parking brake is performed. The parking brake safety device 60 is released from the monitoring state (standby state) so that normal traveling can be performed.

Further, in the case of the above 11., the operation release controller 63 determines that the driver is about to start the vehicle and releases the operation of the parking brake safety device 60. . And these 10.,
In the case of 11, the operation release signal is set by the operation release controller 63, and the operation release signal is output from the driver 66 to the solenoid valve 90. In this case, the second solenoid 95 is activated by the operation release signal.
Is excited, the air intake port 98A and the air feed port 98B are blocked, and the air feed port 98B and the air discharge port 98C are communicated with each other.

As a result, the supply of high-pressure air from the air tank 81 to the master cylinder 5B is stopped, and the high-pressure air acting on the master cylinder 5B is released from the air outlet 9
The vehicle is released to the atmosphere via 8C to release the braking force of the vehicle. By the way, when a predetermined time elapses after the parking brake safety device 60 is turned on, the horn 180 is activated by the alarm generating means 181 as described above.
When the operation of the parking brake safety device 60 is released (system off state) by performing the operation of 10 or 11, the instruction from the alarm generation releasing means 182 is received,
The count of the timer 65A is reset.

Then, by resetting the timer 65A, the horn 180 does not sound even if a predetermined time has elapsed since the system was turned on. That is, the horn 180 is sounded to inform the driver, who is originally located far from the vehicle, of the system-on state of the parking brake safety device 60, and the operation of the parking brake safety device 60 is released. When the system is in the off state, the driver is naturally in the passenger compartment and there is no need to make the horn 180 ring.

Therefore, as described above, the operation of the parking brake safety device 60 is canceled by performing the operation of 10. or 11. before a predetermined time has elapsed since the parking brake safety device 60 was turned on. In the off state), the count of the timer 65A is reset to prohibit the horn 180 from ringing. By the way, the parking brake safety device 60 described above is a so-called emergency device provided to stop the parked vehicle when it starts moving, and the parking brake safety device 60 is used when the vehicle is normally used. It is unlikely to operate frequently.

As described above, when the parking brake safety device 60 is rarely operated, the parking brake safety device 6 is operated.
Even if there is some abnormality in 0, it is difficult to find this abnormality unless regular function check is performed. Further, when the parking brake safety device 60 is failing for some reason, unless the parking brake safety device 60 is detected and notified to the occupant, the parking brake safety device 60 should operate (that is, the parking brake is not sufficiently effective). It is conceivable that the reliability of the parking brake safety device 60 may be impaired because the vehicle cannot be stopped when the parked vehicle starts moving.

Therefore, the present apparatus is also provided with a function of periodically and automatically diagnosing the parking brake safety device 60 and detecting an abnormality of the parking brake safety device 60. FIG. 4 is a schematic configuration diagram focusing on the abnormality detecting function of the present device. As shown in FIG. 4, on the auxiliary air supply passage 84 on the downstream side of the solenoid valve 90, specifically, The auxiliary air supply passage 8 is provided between the solenoid valve 90 and the double check valve 89.
A pressure switch 100 is provided as an auxiliary air supply path pressure detecting means (or a supplementary pressure detecting means) capable of detecting the pressure inside the pressure sensor 4.

The pressure switch 100 is an ON / OFF switch that outputs an ON signal when the pressure in the auxiliary air supply passage 84 becomes equal to or higher than a predetermined pressure.
It is set to output an ON signal in a low pressure state of about 5 kgf / cm ² . This is because it is considered that some residual pressure remains when the inside of the auxiliary air supply passage 84 is opened to the atmosphere, and when the air pressure is completely released, the pressure switch 100 is in the off state. Therefore, the setting is sensitive to air pressure.

Since the pressure switch 100 is for detecting the presence or absence of air pressure acting on the master cylinder 5B through the auxiliary air supply passage 84 and the double check valve 89, as shown in FIG. Further, it is provided near the double check valve 89. Further, near the air tank 81, an air source pressure detecting means (hereinafter, referred to as a low pressure alarm switch) 105 capable of detecting the pressure in the air tank 81 is provided. The low-pressure alarm switch 105 is a sensor generally used to detect the pressure of the air tank 81 in a vehicle equipped with an air brake.

The pressure switch 100 and the low pressure alarm switch 105 are both connected to the controller 9 as a control means. In addition, in the controller 9, the above-mentioned slope start assist device control means 5 is provided.
1 and parking brake safety device control means 61, a simulated signal output means 110 for detecting the abnormality and an auxiliary air supply path pressure abnormality detection means (hereinafter, simply referred to as abnormality detection means) 115 are provided.

Here, the simulated signal output means 110
Outputs a signal (simulation signal) for performing a test operation to the solenoid valve 90 at regular intervals (for example, about once a month). In addition, the abnormality detection means 115 includes the simulated signal output means 110.
When a simulation signal is output to the solenoid valve 90 by the solenoid valve 90, the auxiliary air supply passage 84 is based on the pressure of the auxiliary air supply passage 84 detected by the pressure switch 100.
It detects the abnormal pressure.

Further, in the controller 9, when the abnormality detecting means 115 detects a pressure abnormality of the auxiliary air supply passage 84, that is, an abnormality of the parking brake safety device 60, an alarm generating means for generating an alarm at a predetermined timing. 120 is connected. The procedure of this abnormality detection will be briefly described below. First, the simulated signal output means 11
In 0, when it is time to perform the periodic abnormality detection, the parking brake safety device 60 is under the control of the parking brake safety device control means 61 based on the information from the parking brake safety device control means 61 in the controller 9. It is designed to judge whether or not.

Here, the parking brake safety device control means 6
1 is not under the control, that is, the parking brake safety device 60 is not operating and is not in the operation standby state, the pressure in the air tank 81 is the predetermined value based on the pressure information from the low pressure alarm switch 105. (For example, 5kg
f / cm ² ) or more. If the pressure in the air tank 81 is equal to or higher than a predetermined value, the simulated signal output means 110 outputs a simulated signal to the solenoid valve 90.

This simulated signal is composed of a first simulated signal and a second simulated signal, and the first simulated signal is first output and then the second simulated signal is output. It has become so. The solenoid valve 90 is designed to perform an abnormality detecting operation when the simulated signal is input.
When the simulated signal of is input, the solenoid valve 9
0 performs the first test operation, and performs the second test operation when the second simulated signal is input.

Then, the abnormality detecting means 115 uses the parking brake safety device 60 based on the output information from the pressure switch 100 during the first test operation and the output information from the pressure switch 100 during the second test operation. The abnormality detecting means 115 outputs an ON signal from the pressure switch 100 during the first test operation, and an ON signal from the pressure switch 100 during the second test operation. Is not output (that is, the pressure switch 100 is in the off state), it is determined that the parking brake safety device 60 has no abnormality.

The first test operation of the solenoid valve 90 will now be described. The first simulation signal output from the simulation signal output means 110 is a signal for driving the plunger 93 of the solenoid valve 90 downward. If the solenoid valve 90 is normal,
When the first simulation signal is input, the plunger 93 is driven downward (first test operation), and the air intake port 98A and the air supply port 98B should communicate with each other for a predetermined time.

As a result, the pressurized air from the air tank 81 is supplied to the master cylinder 5B via the auxiliary air supply passage 84 and the double check valve 89, and air leaks in the auxiliary air supply passage 84. If there is no abnormality, the ON signal is output from the pressure switch 100. Therefore, when the ON signal is output from the pressure switch 100 during the first test operation, the abnormality detecting unit 115 determines that there is no abnormality during the first test operation.

On the other hand, if the plunger 93 is stuck or air leakage occurs due to damage of the auxiliary air supply passage 84, an ON signal is output from the pressure switch 100 in response to the first simulated signal. Is not done,
In this case, it is determined that the parking brake safety device 60 is abnormal, and the alarm generation means 120 is activated at a predetermined timing.

Next, the second test operation of the solenoid valve 90 by the input of the second simulated signal will be described. This second simulated signal corresponds to the plunger 9
If the solenoid valve 90 is normal, the plunger 93 is driven upward (second test operation) so that the air intake port 98A and the air supply port 98B are separated from each other. The air supply port 98B and the air discharge port 98C should be communicated with each other.

As a result, the pressurized air between the double check valve 89 and the solenoid valve 90 is released to the atmosphere through the air discharge port 98C, the pressure in the auxiliary air supply passage 84 is reduced, and the pressure switch The ON signal is not output from 100 (that is, the pressure switch 100 is turned off). Therefore, the abnormality detecting unit 115 determines that there is no abnormality during the second test operation when the ON signal is not output from the pressure switch 100 during the above-described second test operation.

On the other hand, if the plunger 93 is stuck, the air supply port 98B and the air discharge port 98C are not communicated with each other even if the second simulation signal is input, so that the air pressure in the auxiliary air supply passage 84 is reduced. Remains, pressure switch 1
00 outputs an ON signal. Therefore, in this case, it is determined that there is an abnormality, and at a predetermined timing,
The alarm generating means 120 is activated.

As described above, the abnormality detecting means 115 determines that the parking brake safety device 60 is normal only when no abnormality is recognized during both the first test operation and the second test operation. However, if an abnormality is detected during at least one of the first test operation and the second test operation, the alarm generation means 120 is operated at a predetermined timing to notify the abnormality of the parking brake safety device 60. It is like this. The alarm generating means 120 may also be configured to serve as the above-mentioned alarm buzzer 21.

Further, the pressure switch 100 described above is used.
Is also configured as a pressure detecting means for detecting a pressure abnormality in the auxiliary air supply passage 84 for making a fail determination of the parking brake safety device 60 at normal times. As a result, for example, at normal times, it is determined that the parking brake safety device 60 has failed in the following cases.

With the operation of the parking brake safety device 60 released, the ignition switch is turned off from the key switch 18.
When the N signal is input and the stop lamp switch 15 detects that the brake pedal 4 is not stepped on, the pressure switch 100 outputs an ON signal for a predetermined time (for example, 2 seconds) or more. This is because the pressurized air exists in the auxiliary air supply passage 84 and acts on the master cylinder 5B, even though the brake should not be operating, and the controller 9 determines that this is a failure. It is supposed to do.

In addition to the above, when it is detected that the pressure switch 100 is off while the parking brake safety device 60 is operating and the pressure in the air tank is normal. After all, the controller 9 judges that the device 60 is abnormal and judges that the device 60 is failed.

Since the parking brake safety device as one embodiment of the present invention is configured as described above, for example,
The parking brake safety device 60 is turned on according to the flowchart shown in FIG. here,
The flowchart shown in FIG. 5 will be briefly described. First, when the stop of the vehicle 1 is detected by the vehicle speed sensor 13 in step S1, 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 to move in step S3, it is determined in step S4 that the engine is operating with the key switch 18 and the gear shift position is the neutral position with the neutral switch 14. Is detected or the operating condition is detected by the key switch 18 to indicate that the engine is not operating (the gear shift position of the transmission is arbitrary) in step S5, the solenoid valve is operated in step S6. 90 is switched to increase the brake fluid pressure on the rear wheel side.

Then, in step S7, step S6
In response to the increase in the brake fluid pressure in, the rear wheel brake 3 is activated and the parking brake lamp 33 is activated in step S8 to notify the driver of the operation of the parking brake safety device 60. Here, the operation of the solenoid valve 90 (step S6 in FIG. 5) will be described. In this case, first, an operation start controller (first control means) 62 sets an ON signal (operation signal) to the solenoid valve 90, and the driver is activated. This operation signal is output via 66 for a predetermined time.

Then, the actuating signal excites the first solenoid 94 of the solenoid valve 90 to drive the plunger 93 downward. As a result, as shown in FIG. 3B, the first valve body 91 also moves downward similarly to the plunger 93, and the air intake port 98A and the air supply port 98B are in communication with each other, and the air tank 81 The pressurized air from is supplied to the master cylinder 5B.

The pressurized air causes the service brake by the parking brake safety device 60 to operate and stop the vehicle. Further, even after the energization of the first solenoid 94 is stopped after the lapse of the predetermined time, the plunger 93 receives the magnetic force from the first magnet 96 which is a permanent magnet, so that the state as shown in FIG. Is held and the service brake continues to operate.

A check valve 87 is provided in the auxiliary air supply passage 84, and a double check valve 89 is provided in a connecting portion between the auxiliary air supply passage 84 and the air supply passage 83 on the rear wheel side. Therefore, the high pressure air reliably acts on the master cylinder 5B. That is, since the check valve 87 allows only air to flow from the air tank 81 side to the master cylinder 5B side, backflow of high-pressure air is prevented and the double check valve 8
9, the auxiliary air supply passage 84 and the rear wheel side air supply passage 8
Of the three, the supply passage having the higher working pressure of the high-pressure air is opened, so that the high-pressure air surely acts on the master cylinder 5B.

As a result, even if the parked vehicle starts to move and the service brake on the rear wheel side is activated, a large braking force acts, and the vehicle can be stopped safely.

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. Further, in the present invention, when the parking brake safety device 60 is in the system-on state, the controller 9 sounds the horn 180 according to the flowchart shown in FIG. 6 to notify the operation of the parking brake safety device 60.

That is, first, in step SB1,
It is determined whether the parking brake safety device 60 is in the system-on state. Here, when the parking brake safety device 60 is not operating (that is, when the system is in the off state), the process proceeds to step SB5, and the operation stop signal of the horn 180 is output. When the parking brake safety device 60 is in the system-on state, the process proceeds to step SB2. When the parking brake safety device 60 is in the system-on state, the timer 65A is triggered to start counting the elapsed time from the system-on state.
At B2, it is determined based on a signal from the timer 65A whether or not a predetermined time t1 (for example, t1 = 1 minute) has elapsed since the parking brake safety device 60 was activated.

Then, according to the output signal from the timer 65A, if the predetermined time t1 has not yet elapsed, step SB
5 and if the predetermined time t1 has elapsed, step S
Proceed to B3. When a predetermined time t1 has elapsed after the parking brake safety device 60 is in the system-on state, in step SB3, the alarm generating means 181 is activated and the alarm member (horn) 180 is sounded to intermittently emit a horn sound around. Sound.

Thus, the driver outside the vehicle compartment is informed of the operation of the parking brake safety device 60, and the operation such as re-pulling of the parking brake is prompted. Thereafter, the process proceeds to step SB4, it is determined whether or not a predetermined time t2 (for example, t2 = 1 minute) has elapsed after the operation of the horn 180, and if it is before the elapse, the process returns to step SB1.

If it is determined in step SB4 that the predetermined time t2 has elapsed after the horn 180 is activated, the process proceeds to step SB5.
The ringing of 0 is stopped. In this case, for example, the alarm generation means 181 outputs an operation stop signal and the horn 180 stops ringing. Also, step SB
If the operation of the parking brake safety device 60 is canceled (system off state) before the predetermined time t1 has elapsed in 2, the timer 65A is activated by the alarm generation canceling means 182.
Is reset and the ringing of the horn 180 is prohibited.

As described above, in the parking brake safety device 60 of the present invention, when the predetermined time t1 elapses after the system is in the on state, the horn 180 is made to ring, so that the driver away from the vehicle Also, it is possible to notify people around the vehicle that the parking brake safety device 60 is in an operating state and urge the parking brake or the like to be redrawn. Then, this allows the vehicle to be parked more safely.

Further, since the horn 180 is not made to ring until the predetermined time t1 elapses, if the parking brake safety device 60 is activated immediately after parking simply due to a driver's operation error, the horn 180 does not ring. , Don't bother others. In this way, when the parking brake safety device 60 is activated immediately after parking, the driver is in the vehicle compartment, so that the driver can know this by blinking the parking brake lamp 33.

Further, since the horn 180 provided on the vehicle as the alarm member is configured to ring, the present invention can be realized by adding only control software without newly providing any parts. The advantage is that Therefore, there is also an advantage that the manufacturing cost and weight hardly increase. Further, the alarm generating means 181 is adapted to intermittently ring the horn 180, so that whether the driver or people in the vicinity is an alarm sound for notifying the system-on state of the parking brake safety device 60. It can be determined immediately.

If the parking brake safety device 60 goes into the system-off state before the lapse of a predetermined time t1 after the operating state, the alarm generation canceling means 182 resets the timer 65A, and the horn 180 sounds as an alarm. There is no need to do anything, and it does not bother others. On the other hand, the operation release of the parking brake safety device 60 will be described. In this case, an off signal (operation release signal) is set to the solenoid valve 90 by the controller (second control means) 62, and this operation release signal is sent via the driver 67. Is output for a predetermined time.

Then, this operation release signal excites the second solenoid 95 of the solenoid valve 90 to drive the plunger 93 upward. As a result, FIG.
As shown in (c), the first valve body 91 moves upward,
The air inlet 98A and the air supply port 98B are cut off from each other, and the second valve body 92 brings the air supply port 98B and the air discharge port 98C into communication with each other, so that the auxiliary air supply path 8 is provided.
The supply of the pressurized air from 4 to the master cylinder 5B is cut off, and the air acting on the master cylinder 5B is released to the atmosphere through the air discharge port 98C.

As a result, the operation of the service brake by the parking brake safety device 60 is released. Further, even after the energization of the second solenoid 95 is stopped after the lapse of the predetermined time, the plunger 93 is magnetized by the magnetic force of the second magnet 97, which is a permanent magnet, as in the operation signal output described above. ), The service brake operation release state by the parking brake safety device 60 is maintained.

By providing both the parking brake safety device 60 using the solenoid valve 90 and the hill start assist device 50 in the vehicle brake device as described above, the following effects can be obtained.

That is, the driver's fatigue is reduced by operating the hill start assisting device 50 to maintain the braking force even when the brake pedal 4 is released when the vehicle is temporarily stopped such as waiting for a traffic light or a traffic jam. This also makes it possible to easily start on a slope. On the other hand, when the parking brake is operated and the vehicle is parked or parked, if the engine is operating and the shift position is in the neutral position, or if the engine is not operating and the shift position is arbitrary, the parking brake safety The device 60 is activated.

As a result, when the vehicle starts to move even if the vehicle is not operated on a slope or the like, high pressure air is supplied from the air tank 81 to the master cylinder 5B,
The service brake of the vehicle is activated, and the safety of the vehicle parked and parked is ensured. Further, when the depression of the brake pedal 4 is detected, it is determined that the driver is about to perform the starting operation, and the parking brake safety device 60 is released. This releasing operation is performed on the auxiliary air supply passage 84. This is executed by outputting an operation release signal to the solenoid valve 90 to open the high pressure air to the atmosphere. This allows
The driver can drive the vehicle as usual.

Further, as described above, in the vehicle equipped with the air brake, the auxiliary air supply passage 84 is provided in the brake actuation air supply system 6, and the auxiliary air supply passage 84 is opened / closed on the auxiliary air supply passage 84. Also, the parking brake safety device 60 can be mounted on a vehicle with a small mechanism by a simple configuration in which a solenoid valve 90 that can perform both the opening and the atmosphere is provided. Also,
This also has the advantage that the parking brake safety device 60 can be mounted on a vehicle with almost no increase in cost or weight.

Further, since the first solenoid 94 and the second solenoid portion 95 are coaxially arranged, there is an advantage that the solenoid valve 90 can be downsized.

By the way, when the parking brake safety device 60 is operated while the engine is off, the timer 65 is triggered to start the counting. When it is detected by the timer 65 that a predetermined time (for example, 1 hour) has elapsed while the vehicle is stopped, it is determined that the parking brake safety device 60 is sufficiently operated and the safety of parking is ensured. Then, the vehicle speed sensor power switch 64 and the system power switch 64A are turned off, and the vehicle speed sensor 1
3 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 monitoring posture by the controller 9 has been released.

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 operating, 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. Further, even when the parking brake safety device 60 is in operation, the operation of the parking brake safety device 60 is released even when the release operation of the parking brake lever is detected a predetermined number of times (for example, twice). This is because the driver deliberately judges that the parking brake has been surely actuated to safely park the vehicle, whereby the parking brake safety device 60 is released from unnecessary operation, and the battery is discharged. The burden can be reduced.

Further, the parking switch (parking brake operating state detecting means) 16 detects the operating state of the parking brake from the operating position of the parking brake lever (parking brake operating member) so that the parking brake can be operated easily and reliably. The state can be detected. Further, there is an advantage that the operating state of the parking brake can be detected at low cost.

In this device, the parking brake safety device 60 is regularly and automatically diagnosed by the abnormality detecting function of the parking brake safety device 60. Then, the abnormality detection of the parking brake safety device 60 is specifically performed as follows. That is, the simulated signal output means 110 outputs the first and second simulated signals to the solenoid valve 90. Then, the solenoid valve 90 performs the first and second test operations according to these first and second simulation signals.

Then, the abnormality detecting means 115 determines that the parking brake safety device 60 is normal only when no abnormality is recognized during both the first test operation and the second test operation. is there.

In other words, even if either one of the first test operation and the second test operation is normal, if the other is abnormal, it is determined that the parking brake safety device 60 is abnormal. is there. If an abnormality is detected during both the first test operation and the second test operation, it is naturally determined that the parking brake safety device 60 has an abnormality. That is, the first
If the plunger 93 is stuck during the test operation of 1. or air leakage occurs due to damage of the auxiliary air supply passage 84, etc., the ON signal is not output from the pressure switch 100 in response to the first simulated signal. If
When it is determined that the parking brake safety device 60 is abnormal, the alarm generation means 120 is activated.

Also during the second test operation, if the plunger 93 is stuck, even if the second simulation signal is input, the air feed port 98B and the air discharge port 9 will be discharged.
Since it is not communicated with 8C, the air pressure remains in the auxiliary air supply passage 84, and the pressure switch 100 outputs an ON signal. Therefore, in this case, it is determined that there is an abnormality, and the alarm generation means 120 is activated.

As described above, when an abnormality is detected during at least one of the first test operation and the second test operation, the occupant activates the alarm generating means 120 at a predetermined timing to make the parking brake safe for the occupant. The abnormality of the device 60 can be known. Further, in the present device, such a simple abnormality that the pressure switch 100 is provided in the auxiliary air supply passage 84 and the control software is added can perform such periodic abnormality detection with almost no increase in cost. There is an advantage that you can.

Further, by providing the pressure switch 100 in the auxiliary air supply passage 84, the following abnormality determination can be performed during normal operation, in addition to the regular diagnosis described above. For example, when the ignition ON signal is input from the key switch 18 and the stop lamp switch 15 detects that the brake pedal 4 is not stepped on while the parking brake safety device 60 is deactivated, When the ON signal is output from the pressure switch 100 for a predetermined time (for example, 2 seconds) or more, the controller 9 determines that it is a failure.

This is because the auxiliary air supply passage 84 is used even though the brake should not be operated in the above case.
This is because the pressurized air exists in the cylinder and acts on the master cylinder 5B. In addition to this, when the parking brake safety device 60 is operating and the pressure in the air tank is detected to be normal, the pressure switch 100
When is off, the controller 9 again determines that it is fail.

As described above, it is possible to easily determine the failure in the normal state only by providing the pressure switch 100 in the auxiliary air supply passage 84.

Although the parking brake safety device described above is configured to use the horn 180 as an alarm member and intermittently ring the horn 180, other than this, for example, a headlight or the like may be used as the alarm member. You may make it use the lamps. Then, when the alarm member is activated, the lamps may be made to blink. With such a configuration, it is possible to obtain an advantageous configuration in terms of preventing noise to the surroundings.

In addition to the above-mentioned air-over-hydraulic type brake, the brake pedal 4 and the master cylinder 5 are also provided.
A vehicle equipped with a hydraulic service brake using brake oil as a working fluid between A and 5B, a vehicle equipped with a pure air brake that directly operates a brake operating member by high-pressure air, and 64-67
The present invention may be applied to a vehicle or the like disclosed in Japanese Patent Publication No. 452, which controls the operation of the parking brake mechanism to prevent the vehicle from freely moving.

Further, the auxiliary air supply passage 84 and the solenoid valve 90 do not necessarily have to be provided in the rear wheel side air supply system 6, and for example, this may be provided in the front wheel side air supply system 6, specifically the front wheel side air supply passage. Magnet valve 7 at 82
It may be configured to be provided between the downstream side and the front wheel side master cylinder 5A.

[0138]

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, the wheels are restrained independently of the operation of the driver. Brake auxiliary drive means capable of controlling power, parking brake operating state detecting means for detecting operating state of the parking brake, vehicle speed detecting means for detecting vehicle speed, parking brake operating state detecting means and vehicle speed Based on the detection result of the detection means, when the predetermined vehicle speed is detected even though the parking brake is in operation, the operation of the brake auxiliary drive means is set to the system-on state so as to increase the braking force to the wheel. And a control means for controlling the system is provided. When the system is turned on by the control means, a timer is triggered so that the system is turned on from a predetermined state. If during elapses, the configuration of the alarm generating means for actuating an alarm member is provided,
It is possible to notify the driver who is away from the vehicle and the surrounding people that the system is on, and to prompt an appropriate operation such as redrawing of the parking brake.
Then, this has an effect that the vehicle can be parked more safely. Further, since the alarm member does not operate until a predetermined time elapses, if the system is turned on immediately after parking due to a driver's operation error, etc., the alarm member does not operate and does not disturb the surroundings. . When the system is turned on immediately after parking in this way, the driver is in the vehicle compartment, and therefore can know the operation of the service brake auxiliary drive means without the alarm member being activated.

Further, according to the parking brake safety device of the present invention as set forth in claim 2, in addition to the structure of claim 1, the alarm generating means performs the control after the engine mounted on the vehicle is turned off. When the system is turned on by the means, a timer is triggered, and when a predetermined time has passed from the system turned on, the means is configured to ring the horn, thereby providing a new part as an alarm member. Nonetheless, there is an advantage that the present invention can be realized by adding only control software. This also has the advantage that the manufacturing cost and weight are hardly affected.

According to a third aspect of the parking brake safety device of the present invention, in addition to the configuration of the first aspect, the alarm generating means is configured as means for intermittently activating the alarm member. By doing so, there is an advantage that the driver and people around him can immediately determine whether or not it is an alarm that notifies the system on state. According to the parking brake safety device of the present invention described in claim 4, in addition to the configuration described in claim 2, when the system is turned on by the control means, the system is turned on for a predetermined time. If the system is turned off by the control means before the time elapses, the timer is reset to prohibit the alarm member from operating even if a predetermined time has passed from the system on. With the configuration in which the alarm generation canceling unit is provided, there is an advantage that the driver does not park the vehicle so that the vehicle is in the system-off state and the alarm member does not operate and the surroundings are not disturbed.

[Brief description of drawings]

FIG. 1 is a schematic control block diagram showing an overall configuration of 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 of a solenoid valve as an actuator of a parking brake safety device as one embodiment of the present invention, in which (a) is a schematic diagram for briefly explaining the structure of the solenoid valve; (B) is a schematic diagram for explaining the operation at the time of its operation, and (c) is a schematic diagram for explaining the operation at the time of its release.

FIG. 4 is a schematic configuration diagram focusing on an abnormality detection function in the parking brake safety device as one embodiment of the present invention.

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

FIG. 6 is a flowchart for briefly explaining an operation of a main part of the parking brake safety device as one embodiment of the present invention.

[Explanation of symbols]

4 brake pedal (service brake operating member) 5A, 5B master cylinder 6 air supply system (brake actuation air supply system) 7 switching valve (magnet valve) 9 controller as control means 10 actuation switch 11 adjustment switch 12 clutch pedal stroke Sensor (or clutch sensor) 13 Vehicle speed sensor (active vehicle speed detecting 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 operating state detecting means) 20 alarm lamp 21 alarm buzzer 33 parking brake lamp 40A front wheel side brake fluid pressure supply system 40B rear wheel side brake fluid pressure supply System 50 Slope Start Assist Device 51 Slope Start Assist Device Control Means 52 Actuation Start Controller 53 Actuation Release Controller 54 Actuation Alarm Controller 55, 56 Driver 60 Parking Brake Safety Device 61 Parking Brake Safety Device Control Means 62 Actuation Start Controller (First Control Means ) 63 deactivation controller (second control means) 64 vehicle speed sensor power cutoff switch (cutoff means) 64A system power switch 65, 65A timer means 66, 67 driver 68 battery 80 brake valve 81 air tank (air source) 82, 83 Air supply path 84 Auxiliary air supply path 87 Check valve 89 Double check valve 90 Solenoid valve (fluid pressure increasing mechanism) 91 First valve body 92 Second valve body 93 Magnetic plunger 94 First solenoid (first solenoid) Renoid part) 95 2nd solenoid (2nd solenoid part) 96 1st magnet 97 2nd magnet 98A Air intake 98B Air supply port 98C Air discharge port 99 Solenoid 100 Pressure switch (auxiliary air supply path pressure detection means or auxiliary pressure) 105) Low pressure alarm switch (air source pressure detection means) 110 Simulated signal output means 115 Auxiliary air supply path pressure abnormality detection means (or abnormality detection means) 120 Alarm generation means 125 Service brake auxiliary drive means 180 Alarm member (horn) , Horn) 181 Alarm generation means 182 Alarm generation cancellation means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Tanaka 5-3-8, Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (72) Toshiaki Tateno 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Automotive Industry Co., Ltd.

Claims (4)

[Claims] 1. In a vehicle equipped with a parking brake, a brake auxiliary drive means is provided which is capable of independently controlling a braking force applied to a wheel in response to a driver's operation, and an operating state of the parking brake is detected. Based on the detection results of the parking brake 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, even though the parking brake is operating, When the vehicle speed is detected, the control means for controlling the operation of the brake auxiliary drive means to the system-on state is provided so as to increase the braking force to the wheel, and when the system is turned on by the control means. In addition, an alarm generating means is provided for activating a warning member when a predetermined time has elapsed from this system-on state by triggering a timer. And wherein, the parking brake safety device. 2. The alarm generating means triggers a timer when the system is turned on by the control means after the engine mounted on the vehicle is turned off, and a predetermined time elapses from the system on state. Then, the parking brake safety device according to claim 1, wherein the parking brake safety device is configured as means for ringing a horn. 3. The parking brake safety device according to claim 1, wherein the alarm generating means is configured as means for intermittently actuating an alarm member. 4. When the system is turned on by the control means, the timer is reset when the system is turned off by the control means before a predetermined time elapses from the system on state. 2. The parking brake safety device according to claim 1, further comprising alarm generation canceling means for prohibiting activation of the alarm member even after a lapse of a predetermined time from the system-on state.