JPH09175352A - Slope start assisting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance safety by issuing an alarm certainly when the braking force becomes insufficient due to variation of the load on the car. SOLUTION: A slope start assisting device concerned is composed of a car stop sensing means 13 to sense the car stopped condition, a driving force shutoff sensing means 14 to sense the condition of the driving force being transmitted, a pressure sensing means 6A to sense the pressure of a working fluid for a service brake, a control valve 7 installed so that it can seal the working fluid, and a control means 9 which is to control the operation of the valve 7. When car stop is sensed by the sensing means 13 and a driving force shutoff condition is sensed by the sensing means 14, the control means 9 puts the control valve 7 in the sealing operation if it is judged that the pressure of the working fluid is higher than the specified value according to the information given by the pressure sensing means 6A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hill start assisting device provided to ensure the safety of a stopped vehicle.

[0002]

2. Description of the Related Art Conventionally, in a vehicle such as an automobile, a slope start assisting device has been developed as one of brake assisting devices capable of reducing the troublesomeness of a driver's brake operation. Such a hill-start assist device is a device that holds the brake fluid pressure when the driver depresses the brake pedal when the vehicle stops due to the brake operation. It is possible to keep the vehicle stopped without continuing to step on.

[0003]

However, it is conceivable that the braking force will be insufficient if the load of the vehicle is changed while operating such a conventional hill-start assisting device on a hill. To be Specifically, when a vehicle such as a bus or a truck is parked on a slope and a large number of passengers or a large amount of luggage are loaded on the vehicle, the weight of the vehicle increases rapidly. The braking force may make it difficult to keep the vehicle stationary.

By the way, in Japanese Patent Laid-Open No. 6-305403, the brake hydraulic pressure of a vehicle is detected, and the vehicle holdable time is calculated from the difference between this brake hydraulic pressure and the minimum hydraulic pressure at which the vehicle can be held in a stopped state. As a result, a technique for issuing an alarm based on the passage of time is disclosed. However, this technique has a problem that an appropriate alarm cannot be issued unless the stop-holdable time is accurately performed. Further, since the valve for sealing the brake hydraulic pressure is operated without detecting the brake hydraulic pressure, the vehicle is held in a stopped state without being applied with a sufficient braking force, which causes the vehicle to move. There is a risk.

Further, Japanese Utility Model Publication No. 5-26709 discloses that
A technique is disclosed that issues an alarm when the brake fluid pressure drops, but this technique simply notifies the driver of a decrease in brake performance due to leakage of brake fluid pressure. It was not a technique to keep the vehicle stopped. The present invention was devised in view of such problems, and when the braking force is insufficient due to load fluctuations of the vehicle or the like, an alarm is surely issued to warn the driver to pay attention to further improve the safety. The purpose is to provide a device.

[0006]

For this reason, the slope start assisting device of the present invention according to claim 1 comprises a stop detecting means for detecting that the vehicle is stopped, and an engine provided in the vehicle. Driving force cutoff detection means for detecting that the driving force transmission is in a cutoff state, pressure detection means for detecting the working fluid pressure of a service brake provided in the vehicle, and a control device provided in a part of the service brake. A control valve provided so that the working fluid can be sealed so as to retain power, and the stop of the vehicle is detected by the information from the vehicle stop detection means, and the engine is detected by the information from the driving force interruption detection means. Control means for sealingly operating the control valve on condition that the pressure of the working fluid is higher than a specified value based on information from the pressure detecting means when it is detected that the driving force of Provide It is characterized in that.

In addition to the structure according to claim 1, the slope starting assist device of the present invention according to claim 2 further comprises a braking operation detecting means for detecting the operation of the service brake by operating a brake pedal, and an alarm. The control means detects the stop of the vehicle by the vehicle stop detection means, the operation of the service brake is detected by the information from the braking operation detection means, and the driving force interruption detection means When the pressure detection means detects that the pressure of the working fluid is equal to or lower than a specified value when it is detected that the driving force of the engine is in the cutoff state, the alarm means is activated. There is.

In addition to the structure of claim 1, the slope start assisting device of the present invention according to claim 3 further comprises alarm means for issuing an alarm, and the control means seals the control valve. When the pressure detecting means detects that the pressure of the working fluid is equal to or lower than a specified value, the alarm means is activated. Further, in the slope start assist device of the present invention according to claim 4, the vehicle stop detection means for detecting that the vehicle is stopped, and the drive force transmission from the engine provided in the vehicle are in a cutoff state. Driving force cutoff detecting means for detecting, pressure detecting means for detecting working fluid pressure of a service brake provided in the vehicle, braking operation detecting means for detecting operation of the service brake by operating a brake pedal, and the service A stop of the vehicle is detected based on information from a control valve provided in a part of the brake and capable of sealing the working fluid to hold the braking force, an alarm means for issuing an alarm, and information from the stop detection means. The operation of the service brake is detected by the braking operation detecting means, and it is detected from the information from the driving force cutoff detecting means that the driving force from the engine is in the cutoff state. When the control valve is closed, the pressure detection means detects that the pressure of the working fluid is equal to or lower than a specified value under the condition that the control valve is closed. And a control means for operating the alarm means.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 are views for explaining a slope starting assistance device as a first embodiment thereof. As shown in FIG. 1, a vehicle 1 is provided with a front wheel brake (front wheel side brake) 2 and a rear wheel brake (rear wheel side brake) 3, and 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 pressure of the working fluid (brake fluid or brake oil) (brake fluid pressure) is increased. The brake fluid pressure actuates the brake shoes 2A, 3A and a brake pad (not shown) to apply a braking force to the vehicle 1.

Further, as shown in FIG. 1, the brake device of the vehicle 1 is provided with a slope start assist device 50 and a parking brake safety device 60. These slope start assist device 50 and parking brake safety device are provided. The mutual interaction of the 60 makes it easy to start the vehicle 1 on a slope and ensures the safety of the parked vehicle 1.

First, a description will be given of a slope starting assistance device 50 as an essential part of the present invention.
0 operates when the vehicle 1 is stopped by depressing the brake pedal 4 shown in FIG. 1, and when it is detected that the driver depresses the brake pedal 4 and the vehicle 1 stops for a predetermined time or more. , The magnet valve 7 provided as a control valve in the brake fluid pressure supply system 6 is switched to seal the brake oil in the brake fluid pressure supply system 6, and the brake pedal 4 is controlled even if the driver releases his / her foot. It is designed to retain power.

The above-mentioned magnet valve 7 is provided in the brake fluid pressure supply system 6 for both the front wheel side brake 2 and the rear wheel side brake 3 so that both the front wheel and the rear wheel can be held in a braking state. ing. Further, the magnet valve 7 holds the brake oil hydraulic pressure of the front wheel side brake 2 and the rear wheel side brake 3 when the slope starting assist device 50 is operated, and also releases the brake oil from the master cylinder 5 side in the brake 2 and 3 directions. It is configured to act as a one-way valve that allows flow.

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-described slope start assist device 50 is controlled by a controller (ECU) 9 as a control means. As shown in FIG. 1, the controller 9 is connected with a pressure switch 6A as a pressure detecting means, and an operation switch (main switch) 1
0, adjustment switch (adjustment switch) 11, reset switch 10A, clutch pedal stroke sensor (clutch sensor) 12, vehicle speed sensor 13 as vehicle stop detection means, neutral switch 14 as drive force cutoff detection means, braking operation detection means The stop lamp switch 15, the parking switch 16, and the seat belt switch 17 are connected, and the controller 9 controls the operation of the magnet valve 7 as a control valve based on the detection information from these sensors. It has become.

The pressure switch 6A detects the working fluid pressure of the brake fluid pressure supply system 6 and outputs it to the controller 9. The magnet switch 7 and the rear wheel side brake of the brake fluid pressure supply system 6 are detected by the pressure switch 6A. It is intervened between 3 and. The operation switch 10 is an on / off switch arranged around the driver, and the operation switch 1
By turning 0 on, the slope start assist device 50 is in a state in which it can be operated.
When turned off, the slope start assist device 50 does not operate.

Further, the adjusting switch 11 is for adjusting the operation of the hill start assisting device 50, and is a switch for adjusting the timing of releasing the brake fluid pressure from the state in which it is held.

The reset switch 10A is a switch for performing initial adjustment of the slope starting assist device 50,
Clutch pedal stroke sensor (clutch sensor) 1
Reference numeral 2 is a sensor that detects when a driver depresses a clutch pedal (not shown) and outputs an ON signal. The vehicle speed sensor 13 is a sensor that detects the speed of the vehicle, and in particular, is a sensor that detects this when the vehicle stops and outputs a stop signal to the controller 9.

The neutral switch 14 is a sensor for detecting the shift position of the transmission and detecting whether or not the transmission state of the driving force from the engine (not shown) is in the cutoff state.
The neutral switch 14 outputs an ON signal only when the gear position of the transmission is in neutral. The stop lamp switch 15 is provided as a braking operation detecting means. That is, the stop lamp switch 15 detects the operating state of the brake pedal 4 of the service brake, and when the driver brake pedal 4 is depressed, the stop lamp switch 15 detects the operation state and outputs an ON signal.

The parking switch 16 is a switch for detecting the operating state of the parking brake lever, and detects the operating state of the parking brake based on the operating position of the parking brake lever. The seat belt switch 17 outputs information to the controller 9 whether the driver is seated or absent by detecting the wearing state of the seat belt of the driver's seat.

As shown in FIG. 1, the controller 9
A warning lamp (indicator lamp) 20 and a warning buzzer 21 as warning means are connected to the driver, and when the operating condition of the hill-start assisting device 50 and the condition of the vehicle 1 meet predetermined conditions, the driver is warned. It is supposed to emit. This will be described later. Further, 20A is an off indicator lamp, and 20B is a parking lamp.

Next, the parking brake safety device 60 provided together with the hill start assisting device 50 will be described. The parking brake safety device 60 is operated by the driver after stopping the vehicle 1 under a predetermined condition. If the vehicle 1 starts to move even if it is not operated, this vehicle 1
It operates to stop.

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 positively increase the brake fluid pressure. The rear wheel brake 3 is mechanically actuated. Therefore, as shown in FIG. 1, a brake actuator (fluid pressure increasing mechanism) that can adjust the brake fluid pressure is provided between the magnet valve 7 of the brake fluid pressure supply system 6 on the rear wheel side and the rear wheel brake 3. 19 are provided.

The brake actuator 19 operates in response to an operation command from the controller 9 described above. 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 brake fluid pressure is increased or decreased to control the operation of the parking brake safety device 60.

In the figure, reference numeral 19A is a limit switch for turning off the operation of the brake actuator 19 when the brake oil hydraulic pressure is raised above a predetermined value by the operation of the brake actuator 19.
9B is a pressure switch for detecting a hydraulic pressure value due to the operation of the brake actuator 19. As described above, the operation of the slope start assist device 50 and the parking brake safety device 60 are both controlled by the controller 9. However, in the following, the slope start assist device 50 and the parking brake safety device will be described. The operation control of the device 60 will be described.

First, the operation control of the slope start assisting device 50 will be described. In the controller 9, when the operation switch 10 is on, the sensors 12 to 15 are provided.
When the following four vehicle states 1 to 4 are detected by
The slope start assist device 50 is operated.

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

4. It is detected from the detection information from the pressure switch 6A that the brake oil pressure is higher than the specified value.

When all of the above four conditions 1 to 4 are satisfied, the controller 9 considers that the driver keeps the vehicle 1 in a stopped state, and the hill start assisting device. The control signal for activating 50 is set, and this control signal is output 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.

As described above, when the hill start assisting device 50 is operated, the vehicle 1 is brought into a stopped state without continuously depressing the brake pedal 4 when the vehicle is stopped on a hill or during a traffic jam. Is reduced. It should be noted that the above-mentioned specified value is such a value that when the vehicle 1 is stopped on a slope, the vehicle 1 can be reliably held in the stopped state even if the load of the vehicle increases. For example, if the vehicle 1 is a bus,
It is also possible that a large number of passengers board the bus at one stop. In this case, the vehicle weight will increase rapidly,
The specified value of the brake oil hydraulic pressure is set to a value such that the braking force by the slope start assist device 50 can be sufficiently maintained even if the vehicle weight increases.

That is, in this device, as described above,
The brake fluid pressure supply system 6 on the rear wheel side is provided with a pressure switch 6A as pressure detecting means. Based on the information from the pressure switch 6A, when the brake oil pressure is below a specified value, the slope starting assist device 50 is provided. Is not activated.

On the other hand, the controller 9 operates the slope start assisting device 50 when any one of the following two states is detected based on the detection information from the sensors 12, 14, and 16. The control signal to be released is set.

5. When the neutral switch 14 detects that the gear of the transmission is operated other than neutral, and the clutch sensor 12 also detects that the clutch pedal has been released. 6. When the parking switch 16 detects the operation of the parking brake lever.

In the case of 5. above, the controller 9
The driver determines that the vehicle 1 is about to start, and sets a control signal for canceling the operation of the slope start assist device 50. In this case, the magnet valve 7 is used.
The release signal is output to. Further, in the case of 6, since the vehicle 1 is kept stopped by the parking brake, the controller 9 judges that it is not necessary to stop the vehicle 1 by containing the brake fluid pressure, and starts the hill. The control signal for releasing the operation of the auxiliary device 50 is set. In this case, if another predetermined condition is satisfied, then the parking brake safety device 60 described above is activated to reliably hold the vehicle 1 in the stopped state.

As described above, when any one of the above conditions 5 and 6 is satisfied, the operation release signal set by the controller 9 is output to the magnet valve 7, whereby the magnet is released. The valve 7 can be 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. The vehicle 1 can be easily started.

When the parking brake is operated (case 6 above), the vehicle 1 is often stopped for a relatively long time. Therefore, the operation of the hill 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. An adjustment switch 11 is also connected to the controller 9, 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 assisting device 50 will be explained. The parking switch 16 and the seat belt switch 17 are connected to the controller 9, and the controller 9 outputs an alarm in any of the following cases. The lamp 20 and the alarm buzzer 21 are activated to warn the driver.

7. When it is detected that the brake oil pressure is below the specified value by the detection information from the pressure switch 6A during the operation of the slope start assist device 50. 8. When the seat belt switch 17 detects that the driver has removed the seat belt. The above 7.
This is a function of monitoring whether the hydraulic pressure of the brake oil is lower than a specified value while the slope start assist device 50 is operating. It should be noted that the specified value of the brake oil pressure is set to a pressure value such that when the vehicle 1 is a bus, the brake oil pressure does not start even if the vehicle is full and the vehicle stops on a slope.
It is set to the same value as the stipulated value in 4 above. Also,
When the vehicle 1 is, for example, a truck, the above-mentioned specified value of the brake oil pressure is set to a pressure value such that the brake oil pressure does not start even if the vehicle is stopped on a slope with a lot of luggage.

When the brake oil pressure of the rear wheel side brake 3 falls below a specified value during the operation of the slope start assisting device 50, an alarm is issued and the driver is warned.
Further, since the magnet valve 7 acts as a one-way valve when the slope starting assistance device 50 is operated, the brake oil hydraulic pressure can be increased by the driver depressing the brake pedal 4. Therefore, when the driver depresses the brake pedal 4 when the alarm is activated and the brake oil pressure becomes larger than the specified value, the alarm operation is stopped.

On the other hand, in the case of the above 8., the controller 9
Then, the driver determines that he / she will leave the seat, sets an alarm signal, and activates the alarm lamp 20 and the alarm buzzer 21 to alert the driver. this is,
This is to prevent the driver from leaving the seat while the slope start assist device 50 is still operating. By using the seat belt switch switch 17, it is possible to reliably detect this when the driver leaves the seat. ing.

Further, in addition to the cases 7 and 8 described above, 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. , Is designed to call the driver's attention.
By providing the vehicle 1 with the hill-start assisting device 50 in this way, the driver's fatigue can be greatly reduced when starting and stopping are frequently repeated, and the hill-start can be started safely and reliably. Can be done.

Next, the operation control of the parking brake safety device 60 will be described. The controller 9 has a brake actuator (fluid pressure increasing mechanism) as shown in FIG.
19 and a parking brake lamp 33 that lights up when the parking brake operates are connected, and the operation of the brake actuator 19 and the parking brake lamp 33 is controlled based on the control signal output from the controller 9. There is.

Here, in the controller 9, when the predetermined vehicle speed is detected even though the parking brake (parking brake) is operating, the parking brake safety device 6 is provided.
A control signal for activating 0 is set. Specifically, as shown in FIG. 1, a vehicle speed sensor 13, a neutral switch 14, a parking switch 16 and the like are connected to the controller 9, and from these sensors 13, 14, 16 the following 9. When any one of the vehicle states is detected, the brake actuator 1
9 is activated to increase the hydraulic pressure of the brake oil.

9. When the parking speed is detected by the vehicle speed sensor 13 even though the parking brake is detected by the parking switch 16, the engine is operated by the key switch (not shown). Is detected and the neutral switch 1
When it is detected by 4 that the shift position is the neutral position.

10. When the parking speed is detected by the vehicle speed sensor 13 even though the parking brake is detected by the parking switch 16, the engine is not operated by the key switch. When it is detected.

In cases 9 and 10 as described above, the controller 9 judges that the vehicle 1 has started to move naturally due to the slope of the slope, etc., even though the vehicle 1 is stopped by the parking brake. Brake actuator 1
A control signal for actuating the parking brake safety device 60 is output to 9.

As a result, the brake actuator 19 provided on the path of the brake fluid pressure supply system 6 on the rear wheel side is activated 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.

Further, at this time, the controller 9 blinks the parking brake lamp 33 to notify the driver that the parking brake safety device 60 is in operation. In the case of 10. above,
When the key switch 18 detects that the engine is not operating, a timer (not shown) is triggered to start counting.

When the timer detects that a predetermined time (for example, 1 hour) has elapsed while the vehicle 1 is stopped, the time-up signal from the timer is received and the vehicle speed sensor power switch is turned off. As a result, the power supply to the vehicle speed sensor 13 is cut off.

As a result, the vehicle 1 by the controller 9
The monitoring posture of is released. In this case, the blinking signal of the parking brake lamp 33 is also turned off to inform the driver that the operation of the parking brake safety device 60 has been turned off.

On the other hand, when the controller 9 detects any one of the following vehicle states 11 and 12 based on the detection information from the stop lamp switch 15 and the parking switch 16, the parking brake safety device 60 operates. It is designed to be deactivated.

11. When the parking switch 16 detects the parking brake lever release operation for a predetermined number of times (for example, twice) in succession. 12. 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 4 (that is, the operation operation of the service brake).

That is, in order to bring the parking brake safety device 60 into the operating state, it is necessary to operate the parking brake as described in detail in Sections 9 and 10 above. Thus, the release of the parking brake is a prerequisite. Here, referring to the above item 11, when releasing the parking brake safety device 60 while the brake actuator 19 is operating to increase the brake fluid pressure, the driver may unknowingly perform the releasing operation. In order not to do so, the parking brake safety device 60 is released when the parking brake is repeatedly released a plurality of times.

The vehicle speed is detected when the parking brake is operating and the engine is operating and the gear shift position is in the neutral position, or when the parking brake is operating and the engine is not operating. And actuator 1
The parking brake safety device 60 is in the standby state such that 9 operates (9., 10. above), but while the vehicle speed is not detected in this standby state, the parking brake is released by one release operation. The monitoring system (standby state) of the brake safety device 60 is released to allow normal traveling.

In the case of 12., the controller 9
Then, it is determined that the driver is about to start the vehicle 1, and the operation of the brake actuator 19 is released. And these 11., 12.
In this case, the controller 9 outputs an operation release signal to the brake actuator 19 so that the brake actuator 19 releases the increase in the brake oil pressure.

Since the slope start assisting device as the first embodiment of the present invention is constructed as described above, for example,
The operation of the slope start assist device 50 is controlled according to the flowchart shown in FIG. First, step SA
At 1, it is determined whether the main switch 10 is on or off. If the main switch 10 is off, step S
Proceeding to A15, the magnet valve 7 is controlled to be inactive, assuming that the driver has no intention of operating the slope start assisting device 50, and then returns.

If the main switch 10 is turned on in step SA1, the process proceeds to step SA2 and it is determined whether or not the slope start assist device 50 is operating. If the slope start assist device 50 is currently inactive, the process proceeds to step SA3 to step SA7 to determine whether or not the conditions for operating the slope start assist device 50 are satisfied. On the other hand, the slope start assist device is determined. If 50 is active,
Steps SA9 to SA14 are proceeded to, and it is determined whether or not the operation of the slope start assist device 50 is released.

First, when it is determined in step SA2 that the hill-start assisting device 50 is not in operation, the process proceeds to step SA3, in which it is determined whether or not the brake pedal 4 is depressed for a predetermined time or longer. When the brake pedal 4 is depressed for a predetermined time or more, the process proceeds to step SA4 and it is determined whether the vehicle is stopped. Then, when the vehicle is stopped, the routine proceeds to step SA5, where it is determined whether or not the clutch pedal is depressed. If it is determined that the clutch pedal is depressed, then the process proceeds to step SA7.

If it is determined that the clutch pedal is not depressed, the process proceeds to step SA6, and it is determined whether or not the shift speed is in the neutral position. Then, if it is determined in step SA6 that the gear stage is in neutral, the process proceeds to step SA7 and the pressure switch 6A
It is determined whether the pressure of the brake oil is less than or equal to a preset specified value based on the detection information from the.

When it is determined in step SA7 that the pressure of the brake oil is higher than the specified value, the process proceeds to step SA8, and the magnet valve 7 is operated. As a result, the brake oil is sealed between the magnet valve 7 and the service brakes 2 and 3, and the braking force is maintained even if the driver releases his foot from the brake pedal.

If it is determined in step SA7 that the pressure of the brake oil is less than or equal to the specified value, it may be impossible to maintain the braking force due to, for example, an increase in the load of passengers on the bus. Then, the process proceeds to step SA15, in which the magnet valve 7 is deactivated and the slope start assist device 50 is not activated. Further, when it is determined in step SA3 that the time that the brake pedal 4 is depressed is less than or equal to a predetermined time,
When it is determined that the vehicle 1 is not stopped in 4,
If it is determined in step SA6 that the gear position is other than neutral, the process proceeds to step SA15 and the magnet valve 7 is deactivated and the slope start assist device 50 is not activated. This is because the state of the vehicle is not suitable for operating the slope start assist device 50.

Next, a case will be described in which it is determined in step SA2 that the hill-start assisting device 50 is operating. In this case, first, at step SA9, it is determined whether or not the shift speed is neutral. Then, if the shift speed is neutral, the routine proceeds to step SA11.
If it is not neutral, the routine proceeds to step SA10, where it is determined whether or not the clutch pedal has been released. If the clutch pedal is released, the process proceeds to step SA15, the magnet valve 7 is deactivated,
The operation of the slope start assist device 50 is released.

If it is determined in step SA10 that the clutch pedal has not been released, step S10
It proceeds to A11 and determines whether or not the parking brake is applied. Here, if it is determined that the parking brake is applied, the process also proceeds to step SA15, the magnet valve 7 is deactivated, and the operation of the slope start assist device 50 is released.

On the other hand, if it is decided at step SA11 that the parking brake is not applied, then the processing advances to step SA12. And this step SA12
Then, based on the information from the pressure switch 6A, it is determined whether the pressure of the brake oil is less than or equal to a specified value. If the pressure of the brake oil is below the specified value, step SA1
After going to step 4 to give an alarm, go to step SA8,
Return is made with the magnet valve 7 kept in the operating state.

That is, when the pressure of the brake oil becomes equal to or lower than the specified value after the operation of the hill start assisting device 50, only an alarm is given and the driver is prompted to depress the brake pedal 4 to activate the hill start assisting device 50. It continues to operate. In addition, the above step SA
When it is determined in 12 that the pressure of the brake oil is larger than the specified value, the process proceeds to step SA13 and it is determined whether or not the seat belt is worn. If the seat belt is not worn, it is determined that the driver has left the seat, and the process proceeds to step SA14 to issue an alarm.

When it is confirmed that the seat belt is worn in step SA13, the process directly proceeds to step SA8, the magnet valve 7 is kept in the operating state, and the operation of the slope start assisting device 50 is continued. As described above, the present device operates the magnet valve 7 at the time of starting a slope, at the time of a temporary stop such as a signal waiting or a traffic jam, and seals the brake oil in the brake fluid pressure supply system 6 so that the brake pedal 4 There is an advantage that the braking force can be maintained even when the foot is released to facilitate starting on a slope and reduce driver fatigue.

On the other hand, when the parking brake is actuated to park and stop the vehicle 1, the engine is operating and the gear shift position is in the neutral position, or the engine is not in operation and the gear shift position is arbitrary. And the parking brake safety device 60 is activated. As a result, when the vehicle 1 starts to move despite no operation on a slope or the like, the brake actuator 19 is activated to increase the brake fluid pressure, and the safety of the vehicle 1 parked and parked is ensured.

By the way, when the vehicle 1 is a bus, it may be considered that a large number of passengers get on at once at a stop or the like. In this case, the vehicle weight suddenly increases, and even if the hill start assisting device 50 is operated, conventionally, it is considered that the braking holding force becomes insufficient as the vehicle weight increases. On the other hand, in the present device, the brake fluid pressure supply system 6 on the rear wheel side is provided with the pressure switch 6A as a pressure detecting means so that the slope start assist device 50 is not operated when the brake oil pressure is equal to or lower than the specified value. At the same time, even after the operation of the hill-start assisting device 50, an alarm is issued when the brake oil pressure becomes equal to or lower than the specified value, so that the driver can be alerted and safety can be improved.

The pressure switch 6A described above is similar to that shown in FIG.
Then, the pressure switch 6A is provided on the upstream side of the brake actuator 19, but the pressure switch 6A may be provided on any downstream side of the magnet valve 7, for example, may be provided on the upstream side of the brake actuator 19. Also,
In the present embodiment, the pressure switch 6A is provided in the brake fluid pressure supply system 6 on the rear wheel side.
A may be provided in the brake fluid pressure supply system 6 on the front wheel side.

Further, the vehicle 1 described above is not limited to buses and trucks, but can be widely applied to other vehicles. Next, a description will be given of a slope start assist device according to a second embodiment of the present invention.
The embodiment is configured similarly to the above-described first embodiment, and is different only in its operation control.

That is, the second embodiment differs from the above-described first embodiment only in the operation start condition of the slope start assist device 50, and in the controller 9, when the operation switch 10 is turned on. And each sensor 12
When the following three vehicle states of 1 to 3 are detected by -15, the slope start assist device 50 is operated.

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

When all of the above three conditions 1 to 3 are satisfied, the controller 9 considers that the driver keeps the vehicle 1 in a stopped state, and causes the magnet valve 7 to operate. The control signal is output. As a result, the operation of the slope start assist device 50 is started, and the vehicle 1 is held in a stopped state even if the driver does not step on the brake pedal 4.

By the way, in the above-described first embodiment, in addition to these conditions 1 to 3, as the fourth condition, it is detected that the brake oil pressure is higher than the specified value from the detection information from the pressure switch 6A. When the vehicle is started, the slope starting assist device 50 is started to operate.
In the embodiment, if the above three conditions are satisfied, the slope start assist device 50 is operated regardless of the pressure of the brake oil, and this point is different from the first embodiment. Of.

After the start of the hill start assisting device 50, the alarm lamp 20 and the alarm buzzer 2 will be displayed if the brake oil pressure is lower than the specified value, as in the first embodiment.
1 gives an alarm. Therefore, when the slope start assist device 50 is operated in a state where the brake oil pressure is lower than the specified value, the alarm lamp 20 and the alarm buzzer 21 are activated to notify the driver of the brake oil pressure state.

As a result, the driver has the brake pedal 4
By increasing the pressure of the brake oil by further depressing, the slope start assist device 50 can be operated safely and reliably. Second of the present invention
Since the slope start assist device as the embodiment is configured as described above, its operation is controlled according to the flowchart shown in FIG. 3, for example.

First, in step SA1, it is determined whether the main switch 10 is on or off. If the main switch 10 is off, the process proceeds to step SA15, where it is determined that the driver has no intention of operating the slope start assist device 50, the magnet valve 7 is controlled to be inactive, and then the process returns. If the main switch 10 is turned on in step SA1, the process proceeds to step SA2,
It is determined whether or not the slope start assist device 50 is operating.

If the slope starting assistance device 50 is not currently operated, the routine proceeds to step SA3 to step SA6, where it is judged whether or not the conditions for operating the slope starting assist device 50 are satisfied. If the auxiliary device 50 is operating, it proceeds to steps SA9 to SA14 to determine whether or not to cancel the operation of the slope starting auxiliary device 50.

First, when it is determined in step SA2 that the hill-start assisting device 50 is not in operation, the process proceeds to step SA3, in which it is determined whether or not the brake pedal 4 is depressed for a predetermined time or longer. When the brake pedal 4 is depressed for a predetermined time or more, the process proceeds to step SA4 and it is determined whether the vehicle is stopped. Then, when the vehicle is stopped, the routine proceeds to step SA5, where it is determined whether or not the clutch pedal is depressed. If it is determined that the clutch pedal is depressed, then the process proceeds to step SA8, where the magnet valve 7
Activate As a result, the brake oil is sealed between the magnet valve 7 and the service brakes 2 and 3, and the braking force is maintained even if the driver releases his foot from the brake pedal.

If it is determined that the clutch pedal has not been depressed, the routine proceeds to step SA6, where it is determined whether or not the shift speed is in the neutral position. And
If it is determined in step SA6 that the gear stage is in neutral, the process proceeds to step SA8, and the magnet valve 7 is operated. Further, when it is determined in step SA3 that the time that the brake pedal 4 is depressed is less than or equal to the predetermined time, or when it is determined in step SA4 that the vehicle 1 is not stopped, step SA6
If it is determined that the shift speed is other than neutral, the process proceeds to step SA15, the magnet valve 7 is deactivated, and the slope start assist device 50 is not activated. This is because the vehicle is in a condition where the vehicle is on a slope start assist device 50
This is because it is not in a state suitable for operating.

Next, a case will be described in which it is determined in step SA2 that the slope start assist device 50 is operating. In this case, first, at step SA9, it is determined whether or not the shift speed is neutral. Then, if the shift speed is neutral, the routine proceeds to step SA11.
If it is not neutral, the routine proceeds to step SA10, where it is determined whether or not the clutch pedal has been released. If the clutch pedal is released, the process proceeds to step SA15, the magnet valve 7 is deactivated,
The operation of the slope start assist device 50 is released.

If it is determined in step SA10 that the clutch pedal has not been released, step S10
It proceeds to A11 and determines whether or not the parking brake is applied. Here, if it is determined that the parking brake is applied, the process also proceeds to step SA15, the magnet valve 7 is deactivated, and the operation of the slope start assist device 50 is released.

On the other hand, when it is determined in step SA11 that the parking brake is not applied, the process proceeds to step SA12. And this step SA12
Then, based on the information from the pressure switch 6A, it is determined whether the pressure of the brake oil is less than or equal to a specified value. If the pressure of the brake oil is below the specified value, step SA1
After going to step 4 to give an alarm, go to step SA8,
Return is made with the magnet valve 7 kept in the operating state.

That is, when the slope starting assist device 50 is operated when the pressure of the brake oil is equal to or lower than the specified value, the driver is alerted by issuing an alarm. This allows the driver to increase the brake pedal 4
By increasing the pressure of the brake oil above the specified value, the slope start assist device 50 can be operated safely and reliably.

When it is determined in step SA12 that the pressure of the brake oil is larger than the specified value, the process proceeds to step SA13 and it is determined whether or not the seat belt is worn. If the seat belt is not worn, it is determined that the driver has left the seat, and the process proceeds to step SA14 to issue an alarm again. When it is confirmed that the seat belt is worn in step SA13, the process directly proceeds to step SA8. Then, the magnet valve 7 is kept in the operating state and the operation of the slope start assisting device 50 is continued.

On the other hand, when the parking brake is actuated to park and stop the vehicle 1, as in the first embodiment,
The parking brake safety device 60 operates in the following cases. That is, the parking brake safety device 60 operates when the engine is operating and the shift position is the neutral position, or when the engine is not operating and the shift position is arbitrary. As a result, if the vehicle 1 starts to move even if the vehicle is not operated on a slope or the like, the brake actuator 1
9 is activated to increase the brake fluid pressure and the vehicle is parked 1
The safety of is secured.

As described above, in this second embodiment,
Similar to the first embodiment, by operating the magnet valve 7 at the time of starting a hill or at the time of a temporary stop such as waiting for a signal or traffic jam, and sealing the brake oil in the brake fluid pressure supply system 6,
By maintaining the braking force even when the foot is released from the brake pedal 4, there is an advantage that it is possible to easily start on a slope and reduce driver fatigue.

When the vehicle 1 is a bus, it is possible that a large number of passengers get on at once at a stop or the like. In this case, the vehicle weight may suddenly increase, and even if the hill-start assisting device 50 is operated, the braking holding force may become insufficient as the vehicle weight increases. The brake fluid pressure supply system 6 on the wheel side is provided with a pressure switch 6A as a pressure detecting means, and the slope start assist device 50 is provided.
When the brake oil pressure becomes equal to or lower than the specified value during the operation of, an alarm is issued, so that the driver can be alerted and safety can be improved.

Further, in the second embodiment, even if the hydraulic pressure of the brake oil is insufficient, the magnet valve 7 is actuated and the operation of the slope start assisting device 50 is started. , Alarm lamp 20 and alarm buzzer 21
Is activated, there is an advantage that the driver can recognize that the hydraulic pressure of the brake oil is insufficient. in this case,
The driver also presses the brake pedal 4 harder to increase the brake fluid pressure, so that the slope start assist device 50 is also activated.
Can be operated safely and reliably.

Next, a description will be given of a slope starting assistance device as a third embodiment of the present invention. In this third embodiment, the device is constructed in the same manner as in the first embodiment, and its operation control is performed. Only is different. That is, in the third embodiment, only the alarm control of the slope start assist device 50 is different from the first embodiment described above.

First, the operation control of the slope start assist device 50 will be described. In the controller 9, as in the first embodiment, when the operation switch 10 is turned on, the sensors 12 to 15 are activated. When the following four vehicle states 1 to 4 are detected, the slope start assist device 50 is activated. 1. Brake pedal 4 with stop lamp switch 15
Has been stepped on for a predetermined time (for example, 1 sec) or longer.

2. It is detected from the vehicle speed sensor 13 that the vehicle is stopped (that is, vehicle speed = 0). 3. The clutch sensor 12 detects that the clutch pedal is depressed, or the neutral switch 1
It is detected from 4 that the gear position is in the neutral position.

4. It is detected from the detection information from the pressure switch 6A that the brake oil pressure is higher than the specified value. When all of the above four conditions 1 to 4 are satisfied, the controller 9 considers that the driver maintains the vehicle 1 in a stopped state, and operates the slope start assist device 50. The control signal to be set is set and the control signal is output 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 can be contained. -ing As described above, when the slope start assist device 50 is operated, the vehicle 1 is stopped without continuously pressing the brake pedal 4 when the vehicle is stopped on a slope or when the vehicle is stopped in a traffic jam. Therefore, driver fatigue is reduced. It is.

On the other hand, in the third embodiment, the following alarm operation is added to the first embodiment. That is, of the above four conditions 1 to 4, only the condition 4 (the brake oil pressure is equal to or less than the specified value) is not satisfied, the controller 9 activates the alarm lamp 20 and the alarm buzzer 21. It is designed to let you.

As a result, when the brake fluid pressure is insufficient due to insufficient operation of the brake pedal 4, the driver is notified of this and the brake pedal operation is urged appropriately. is there. Further, in this case, similarly to the first embodiment, the switching control of the magnet valve 7 is not executed, and the slope start assist device 50 is not operated.

Since the slope start assisting device according to the third embodiment of the present invention is constructed as described above, its operation is controlled in accordance with the flow chart shown in FIG. 4, for example. First, in step SA1, it is determined whether the main switch 10 is on or off. If the main switch 10 is off, the process proceeds to step SA15, where it is determined that the driver has no intention of operating the slope start assist device 50, the magnet valve 7 is controlled to be inactive, and then the process returns.

If the main switch 10 is turned on in step SA1, the process proceeds to step SA2 and it is determined whether or not the slope start assist device 50 is operating. Then, if the slope start assist device 50 is not currently operated, it is determined whether or not the condition for operating the slope start assist device 50 is satisfied by proceeding to step SA3 and thereafter, while the slope start assist device 50 is operated. If yes, step SA9
After that, it is determined whether or not the operation of the slope start assist device 50 is to be released.

First, when it is determined in step SA2 that the hill-start assisting device 50 is not in operation, the process proceeds to step SA3, in which it is determined whether or not the brake pedal 4 is depressed for a predetermined time or longer. When the brake pedal 4 is depressed for a predetermined time or more, the process proceeds to step SA4 and it is determined whether the vehicle is stopped. Then, when the vehicle is stopped, the routine proceeds to step SA5, where it is determined whether or not the clutch pedal is depressed. If it is determined that the clutch pedal is depressed, then the process proceeds to step SA7.

If it is determined that the clutch pedal is not depressed, the process proceeds to step SA6 and it is determined whether or not the shift speed is in the neutral position. Then, if it is determined in step SA6 that the shift speed is in neutral, the process proceeds to step SA7. In step SA7, it is determined whether or not the pressure of the brake oil is less than or equal to a preset specified value based on the detection information from the pressure switch 6A.

When it is determined in step SA7 that the pressure of the brake oil is higher than the specified value, the process proceeds to step SA8, and the magnet valve 7 is operated. As a result, the brake oil is sealed between the magnet valve 7 and the service brakes 2 and 3, and the braking force is maintained even if the driver releases his foot from the brake pedal.

If it is determined in step SA7 that the hydraulic pressure of the brake oil is equal to or lower than the specified value, the process proceeds to step SA16 and an alarm is issued. This prompts the driver to operate the brake pedal 4 reliably. Then, after that, the process proceeds to step SA15,
The magnet valve 7 is controlled to the non-operating state, and the slope start assisting device 50 is deactivated.

When it is determined in step SA3 that the time that the brake pedal 4 is depressed is less than the predetermined time, or when it is determined in step SA4 that the vehicle 1 is not stopped, the gear shift stage is determined in step SA6. If it is determined that is not neutral, the process proceeds to step SA15 and the magnet valve 7 is deactivated, and the slope start assist device 50 is not activated. This is because the state of the vehicle is not suitable for operating the slope start assist device 50.

Next, a case will be described in which it is determined in step SA2 that the slope start assist device 50 is operating. In this case, first, at step SA9, it is determined whether or not the shift speed is neutral. Then, if the shift speed is neutral, the routine proceeds to step SA11.
If it is not neutral, the routine proceeds to step SA10, where it is determined whether or not the clutch pedal has been released. If the clutch pedal is released, the process proceeds to step SA15, the magnet valve 7 is deactivated,
The operation of the slope start assist device 50 is released.

If it is determined in step SA10 that the clutch pedal has not been released, step S10
It proceeds to A11 and determines whether or not the parking brake is applied. Here, if it is determined that the parking brake is applied, the process also proceeds to step SA15, the magnet valve 7 is deactivated, and the operation of the slope start assist device 50 is released.

On the other hand, if it is decided at step SA11 that the parking brake is not applied, then the processing advances to step SA12. And this step SA12
Then, based on the information from the pressure switch 6A, it is determined whether the pressure of the brake oil is less than or equal to a specified value. If the pressure of the brake oil is below the specified value, step SA1
After going to step 4 to give an alarm, go to step SA8,
Return is made with the magnet valve 7 kept in the operating state.

When it is determined in step SA12 that the pressure of the brake oil is larger than the specified value, the process proceeds to step SA13 and it is determined whether or not the seat belt is worn. If the seat belt is not worn, it is determined that the driver has left the seat, and the process proceeds to step SA14 to issue an alarm again. When it is confirmed that the seat belt is worn in step SA13, the process directly proceeds to step SA8. Then, the magnet valve 7 is kept in the operating state and the operation of the slope start assisting device 50 is continued.

On the other hand, when the parking brake is actuated and the vehicle 1 is parked and stopped, the parking brake safety device 60 is actuated in the following cases, as in the first and second embodiments. That is, the parking brake safety device 60 operates when the engine is operating and the shift position is the neutral position, or when the engine is not operating and the shift position is arbitrary. As a result, when the vehicle 1 starts to move despite no operation on a slope or the like, the brake actuator 19 is activated to increase the brake fluid pressure, and the safety of the vehicle 1 parked and parked is ensured.

As described above, in the third embodiment,
Similar to the first embodiment, by operating the magnet valve 7 at the time of starting a hill or at the time of a temporary stop such as waiting for a signal or traffic jam, and sealing the brake oil in the brake fluid pressure supply system 6,
By maintaining the braking force even when the foot is released from the brake pedal 4, there is an advantage that it is possible to easily start on a slope and reduce driver fatigue.

On the other hand, at the time of starting the operation of the hill start assisting device 50, when the brake fluid pressure becomes equal to or less than the specified value, an alarm is issued and the operation start of the hill start assisting device 50 is prohibited.
The driver can surely recognize that the hydraulic pressure of the brake oil is insufficient. Further, in order to operate the slope start assist device 50 in such a situation, the driver needs to press the brake pedal 4 harder to increase the brake fluid pressure, so that the slope start assist device 50 can be operated safely and securely. There is an advantage that it can be operated.

Further, since an alarm is issued even when the brake oil pressure becomes equal to or lower than a specified value during the operation of the hill-start assisting device 50, the driver can be alerted and safety can be improved. is there. Next, a description will be given of a slope start assist device according to a fourth embodiment of the present invention. In the fourth embodiment, in contrast to the above-described first embodiment, the brake device uses an air pressure as a control pressure. It is composed of an over-hydraulic type brake (hereinafter, simply referred to as an air brake), and the operation control, operation release control, and operation alarm control of the slope start assist device 50 are the same as those of the first embodiment. It is a thing.

That is, as shown in FIG. 5, the vehicle brake device is provided with a brake operating air supply system 6'for supplying brake operating air of a required pressure in response to the operation of the brake pedal 4. The master cylinders 5A and 5B connected to the brake fluid pressure supply system for the front wheels and the brake fluid pressure supply system 6 for the rear wheels operate by receiving the brake operating air from the air supply system 6 '. Braking force is generated in the vehicle.

A brake valve 80 and an air tank 81 as an air source are connected to the air supply system 6'of the service brake. When the driver depresses the brake pedal 4, the brake valve 80 opens and the inside of the air tank 81 is opened. High pressure air is released. As a result, high pressure air is supplied to the master cylinders 5A, 5B via the air supply passages 82, 83 and the magnet valve 7 described later.

When the master cylinders 5A and 5B are actuated by the action of this high pressure air, the brake fluid pressures in the brake fluid pressure supply systems 6 on the front and rear wheels are increased to activate the service brake. Members (brake shoes and brake pads) are activated to generate a braking force on the vehicle. The brake device shown in FIG. 5 is provided with a slope start assist device 50 and a parking brake safety device 60, as in the above-described first embodiment, and these devices 50, 60 interact with each other. This makes it possible to easily start the vehicle on a slope and to ensure the safety of the parked vehicle.

Of these, the slope start assist device 50 will be described first. The slope start assist device 50 operates when the vehicle is stopped by stepping on the brake pedal 4, and the driver operates the brake pedal 4. When it is detected that the vehicle is stopped by stepping on for more than a predetermined time, the magnet valve 7 provided in the air supply paths 82 and 83 of the air supply system 6'is switched to supply air on the downstream side of the magnet valve 7. The high pressure air in the system 6'is contained so that the driver can hold the braking force even if he releases his foot from the brake pedal 4.

Here, the magnet valve 7 holds the brake oil hydraulic pressure of the front wheel side brakes and the rear wheel side brakes when the slope start assisting device 50 is in operation, and the air from the air tank 81 side toward the master cylinders 5A, 5B only. Is configured to act as a one-way valve that allows the flow of The operation of the magnet valve 7 is controlled by a controller 9 as a control means.
As shown in FIG. 5, the operation switch 10 and the adjustment switch 1
1, reset switch 10A for initial adjustment, clutch pedal stroke sensor (clutch sensor) 12, vehicle speed sensor 13, neutral switch (shift position detecting means)
14, a stop lamp switch 15, a parking switch 16, a seat belt switch 17 and a low pressure alarm switch 212 are connected. Then, the controller 9 controls the operation of the magnet valve 7 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 assisting device 50 becomes operable, and the operation switch 10 is activated. When turned off, the slope start assist device 50 does not operate. In addition, the adjustment switch 11 is provided on the slope start assist device 5
It is a switch for adjusting the operation of 0 and 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 the driver depresses the clutch pedal and outputs an ON signal, and the vehicle speed sensor 13 is means for detecting the vehicle speed. .

The neutral switch 14 is a sensor for detecting the gear shift position of the transmission, and the neutral switch 14 outputs an ON signal only when the gear position of the transmission is neutral. The stop lamp switch 15 is for detecting the operating state of the brake pedal 4, and is operated by the driver.
When is depressed, this is detected and the ON signal is also output.

The parking switch 16 is a switch for detecting the operating state of the parking brake lever, and detects the operating state of the parking brake based on the operating position of the parking brake lever. The seat belt switch 17 outputs information to the controller 9 whether the driver is seated or absent by detecting the wearing state of the seat belt of the driver's seat.

The low pressure alarm switch 212 is used for the air tank 8
This is a switch for activating the alarm means when the air in 1 has a pressure lower than a predetermined value.

Further, as shown in FIG. 5, a pressure switch 6A for detecting the air pressure and outputting it to the controller 9 is provided on the downstream side of the magnet valve 7. further,
The controller 9 includes an alarm lamp 20 and an alarm buzzer 21.
Is connected, and when the operating condition of the hill start assisting device 50 and the condition of the vehicle meet predetermined conditions, an alarm is issued to the driver.

Then, the controller 9 sets the ON / OFF control signal of the magnet valve 7 based on the detection information of the above-mentioned sensors 10 to 17 and outputs it to the magnet valve 7. The operating conditions and deactivating conditions of the hill start assist device 50 are the same as those in the above-described first embodiment, and thus the description thereof will be omitted.

Next, the parking brake safety device 60 will be described. The parking brake safety device 60 is designed so that when the parking brake safety device 60 is parked on a slope without sufficiently pulling the parking brake lever, the vehicle naturally moves due to the action of gravity or the like. When it starts to move, it detects this and increases the brake fluid pressure to mechanically operate the service brake on the rear side.

Therefore, as shown in FIG. 5, an 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 The auxiliary air supply passage 84 is provided with a check valve 87 and a solenoid valve (fluid pressure increasing mechanism) 90 as an actuator from the upstream side, and the controller 9 includes the above-mentioned sensors 10 to 17 in the controller 9.
By controlling the operating state of the solenoid valve 90 based on the detection information from the vehicle, the braking force of the vehicle is automatically increased and the operation of the parking brake safety device 60 is controlled. The check valve 87 described above
Is a check valve that allows only the high pressure air from the air tank 81 to flow downstream, as shown in the figure.

When the solenoid valve 90 is actuated and the parking brake safety device 60 is switched to the actuated state, the double check valve 89 is fed from the auxiliary air supply passage 84.
High pressure air is supplied to the master cylinder 5B via the. Where 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.

Further, as shown in FIG. 5, between the solenoid valve 90 and the double check valve 89 on the auxiliary air supply passage 84, the auxiliary air supply passage capable of detecting the pressure in the auxiliary air supply passage 84. A pressure switch 100 is provided as pressure detecting means. In addition, in this vehicle,
An ABS (anti-lock brake system) that prevents the wheels from being locked during braking and an ASR (anti-spin regulator) that prevents the drive wheels from idling on slippery road surfaces are also provided.

That is, as shown in FIG. 5, an ABS valve 200 for the front wheel is provided between the magnet valve 7 on the air supply passage 82 on the front wheel side and the master cylinder 5A. The front wheels are prevented from being locked by appropriately adjusting the opening degree of. Further, between the magnet valve 7 on the air supply passage 83 on the rear wheel side and the master cylinder 5B, an A for the rear wheel is provided.
BS valves 202 and 204 are provided. here,
This vehicle is a rear-wheel drive vehicle that uses rear wheels as drive wheels, and therefore, ABS valves 202 and 204 are independently provided on the left and right sides of the rear wheel. The rear wheels are prevented from being locked by properly adjusting the ABS valves 202 and 204.

Further, reference numeral 206 in the drawing is an ASR valve, and by adjusting the valve opening degree of the ASR valve 206, a braking force is applied to the drive wheels that are about to idle, and idling is prevented. There is. Reference numerals 208 and 210 are double check valves, and these double check valves 208 and 210 are the above-mentioned double check valves 89.
Similarly to the above, it 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 operating conditions and deactivating conditions of the parking brake safety device 60 are also the same as those in the above-described first embodiment, and the description thereof will be omitted here. Since the slope start assisting device according to the fourth embodiment of the present invention is configured as described above, the magnet valve 7 is actuated at the start of the slope or at the time of a temporary stop such as waiting for a signal or traffic jam, and the air supply system 6 '. By sealing the air inside, the braking force is maintained even when the foot is released from the brake pedal 4. Therefore, it is possible to easily start on a slope and reduce driver fatigue.

In this case, according to the information from the pressure switch 6A as the pressure detecting means provided on the downstream side of the magnet valve 7, the slope starting assist device 50 is not operated when the air pressure is below the specified value. Auxiliary device 50
Can improve the safety of. Further, even after the hill start assist device 50 is activated, when the air pressure becomes equal to or lower than the specified value, an alarm is issued and the driver is warned, so that the driver can be warned again and the safety can be improved. It has the advantage that it can.

On the other hand, when the parking brake is actuated and the vehicle 1 is parked or stopped, the engine is operating and the shift position is the neutral position, or the engine is not operating and the shift position is arbitrary. And the parking brake safety device 60 is activated. As a result, when the vehicle 1 starts to move despite no operation on a slope or the like, the brake actuator 19 is activated to increase the brake fluid pressure, so that the safety of the vehicle 1 parked or parked can be ensured. .

The brake device according to the second and third embodiments described above may be applied to such an air-over-hydraulic brake.

[0132]

As described above in detail, according to the slope start assisting device of the present invention as defined in claim 1, the vehicle stop detecting means for detecting that the vehicle is stopped, and the engine provided in the vehicle. Driving force cutoff detecting means for detecting that the driving force transmission from the vehicle is in the cutoff state, pressure detecting means for detecting the working fluid pressure of the service brake provided in the vehicle, and a part of the service brake. The control valve provided so as to seal the working fluid so as to maintain the braking force, the stop of the vehicle is detected by the information from the vehicle stop detection means, and the information is output from the drive force cutoff detection means. Control means for sealingly operating the control valve on condition that the pressure of the working fluid is higher than a specified value based on the information from the pressure detecting means when it is detected that the driving force from the engine is in the cutoff state; , The configuration of that, the advantage is obtained that can be held safely stopped the vehicle. That is, since the braking force is maintained on the condition that sufficient braking force is applied to the vehicle based on the information from the pressure detecting means, it is possible to reliably prevent the vehicle from moving due to load variation of the vehicle. , The safety can be greatly improved as compared with the conventional hill start assist device.

In addition to the structure according to claim 1, the slope starting assist device of the present invention according to claim 2 has a braking operation detecting means for detecting the operation of the service brake by operating a brake pedal, and an alarm. The control means detects the stop of the vehicle by the vehicle stop detection means, the operation of the service brake is detected by the information from the braking operation detection means, and the driving force interruption detection means When it is detected that the driving force of the engine is in the cutoff state and the pressure detection means detects that the pressure of the working fluid is equal to or lower than a specified value, the alarm means is activated. It is possible to let the driver recognize that the pressure of the working fluid is insufficient due to insufficient operation of the brake pedal, and it is possible to encourage appropriate pedal operation. There is an advantage in that.

In addition to the structure of claim 1, the slope start assisting device of the present invention according to claim 3 further includes alarm means for issuing an alarm, and the control means seals the control valve. When the pressure detecting means detects that the pressure of the working fluid is equal to or lower than a specified value, the alarm means is activated to reliably detect a decrease in the working fluid pressure. There is an advantage that an appropriate alarm operation can be performed.

Further, in the slope start assist device of the present invention as defined in claim 4, the vehicle stop detecting means for detecting that the vehicle is stopped and the transmission of the driving force from the engine provided in the vehicle are cut off. A driving force interruption detecting means for detecting that there is a pressure detecting means, a pressure detecting means for detecting a working fluid pressure of a service brake provided in the vehicle, and a braking operation detecting means for detecting an operation of the service brake by operating a brake pedal. , A control valve provided in a part of the service brake so as to seal the working fluid so as to hold a braking force, an alarm means for issuing an alarm, and information of the vehicle based on information from the stop detection means. When the stop is detected, the operation of the service brake is detected by the braking operation detecting means, and the driving force from the engine is cut off by the information from the driving force cutoff detecting means. The control valve is operated to be sealed when it is detected that the pressure of the working fluid is below a specified value by the pressure detection means under the condition that the control valve is sealed. When the pressure of the working fluid decreases while the control valve is operating, the control means for activating the alarm means when the pressure is detected is reliably detected and an appropriate alarm is issued. There is an advantage that can be emitted. As a result, the safety can be greatly improved in comparison with the conventional hill start assist device.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an overall configuration of a slope starting assistance device as a first embodiment of the present invention.

FIG. 2 is a flow chart for explaining the operation of the slope start assist device according to the first embodiment of the present invention.

FIG. 3 is a flowchart for explaining the operation of a slope starting assistance device according to a second embodiment of the present invention.

FIG. 4 is a flowchart for explaining an operation of a slope starting assistance device according to a third embodiment of the present invention.

FIG. 5 is a schematic diagram showing an overall configuration of a slope starting assistance device according to a fourth embodiment of the present invention.

[Explanation of symbols]

1 Vehicle 2 Front Wheel Brake (Front Wheel Brake) 3 Rear Wheel Brake (Rear Wheel Brake) 2A, 3A Brake Shoe 4 Brake Pedal 5, 5A, 5B Master Cylinder 6 Brake Fluid Pressure Supply System 6A Pressure Switch as Pressure Detection Means 6 ′ Air supply system for brake operation 7 Magnet valve as control valve 8 LSV (load sensing valve) 9 Controller (ECU) as control means 10 Operation switch (main switch) 11 Adjustment switch (adjust switch) 12 Clutch pedal stroke Sensor (clutch sensor) 13 Vehicle speed sensor as vehicle stop detection means 14 Neutral switch as drive force cutoff detection means 15 Stop lamp switch 16 Parking switch 17 Seat belt switch 19 Parking brake Brake actuator for safety device 20 Alarm lamp (indicator lamp) as alarm means 20A Off indicator lamp 20B Parking lamp 21 Alarm buzzer as alarm means 50 Slope start assist device 60 Parking brake safety device 80 Brake valve 81 Air tank 82, 83 Air supply path 84 Auxiliary air supply path 87 Check valve 89 Double check valve 90 Solenoid valve as actuator (fluid pressure increasing mechanism) 100 Pressure switch 200, 202, 204 ABS valve 206 ASR valve 208, 210 Double check valve 212 Low pressure alarm switch

Claims (4)

[Claims] 1. A vehicle stop detection means for detecting that a vehicle is stopped, a drive force cutoff detection means for detecting that a drive force transmission from an engine provided in the vehicle is in a cutoff state, and the vehicle. A pressure detecting means for detecting the working fluid pressure of the service brake, a control valve provided in a part of the service brake and capable of sealing the working fluid to hold the braking force, When the stop of the vehicle is detected by the information from the vehicle stop detection means and the driving force from the engine is detected by the information from the driving force cutoff detection means, the pressure detection means And a control means for sealingly operating the control valve on condition that the pressure of the working fluid is higher than a prescribed value based on the information. 2. A braking operation detecting means for detecting an operation of the service brake by operating a brake pedal, and an alarm means for issuing an alarm, wherein the control means detects the stop of the vehicle by the vehicle stop detecting means. When the operation of the service brake is detected based on the information from the braking operation detecting means and the driving force cutoff detecting means detects that the driving force of the engine is in the cutoff state, the working fluid is detected by the pressure detecting means. 2. The slope assist device according to claim 1, wherein the alarm means is actuated when it is detected that the pressure is below a specified value. 3. An alarm means for issuing an alarm is provided, wherein when the control means seals the control valve, the pressure detecting means detects that the pressure of the working fluid is below a specified value. The sloping start assisting device according to claim 1, characterized in that the alarm means is activated. 4. A vehicle stop detecting means for detecting that the vehicle is stopped, a driving force cutoff detecting means for detecting that a drive force transmission from an engine provided in the vehicle is in a cutoff state, and the vehicle. A pressure detecting means for detecting the working fluid pressure of the service brake, a braking operation detecting means for detecting the operation of the service brake by operating the brake pedal, and a braking force interposed in a part of the service brake. A control valve capable of sealing the working fluid to hold it, an alarm means for issuing an alarm, a stop of the vehicle is detected by information from the vehicle stop detecting means, and the service is detected by the braking operation detecting means. When the operation of the brake is detected and it is detected that the driving force from the engine is in the cutoff state based on the information from the driving force cutoff detection means, the control valve is closed and actuated. And a control means for activating the alarm means when the pressure detection means detects that the pressure of the working fluid is equal to or lower than a specified value under the condition that the control valve sealing condition is satisfied.
Slope start assist device, which is equipped with