JPH09104328A - Braking device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the stop state of a vehicle by holding a brake force through operation of a simple lever. SOLUTION: When it is decided by a controller 18 that three conditions of a driver being seated, a parking brake being not operated, and a vehicle being stopped are all satisfied, a solenoid valve 17 is opened. When a hand brake lever 15 is then operated, compressed air is fed to a brake from an air tank 10 through the solenoid valve 17, the brake is operated, and the stop state of a vehicle is held.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle braking device that holds a vehicle in a stopped state without using a parking brake when the vehicle is stopped for a short time.

When stopping for a short time on an uphill road, a flat road, etc.,
Maintaining the stopped state by continuously depressing the brake pedal imposes a great burden on the driver. In such a case, a parking brake may be used, but this parking brake is generally not suitable because it mechanically brakes the parking drum and requires a large operating force.

[0003]

Therefore, when the vehicle is stopped for a short time, the vehicle is held in the stopped state by a simple lever operation without requiring a large lever operating force, and the stopped state is released when the vehicle starts. There is a demand for the development of a braking force retention system that can assist the parking brake.

According to such a braking force holding system,
A braking force retaining device that has been proposed in the past (Japanese Patent Laid-Open No. 2-2804
1, JP-A-59-143746, JP-A-61-200054, etc.) and a slope start assist device (JP-A-3-96460).

Therefore, an object of the present invention is to provide a braking device for a vehicle, which can maintain a braking force by a simple lever operation to maintain the vehicle in a stopped state.

[0006]

In order to achieve the above object, according to the vehicle braking apparatus of the present invention, the vehicle is braked by the pressure fluid source and the pressure fluid from the pressure fluid source. A handbrake valve operated by a handbrake lever, which is arranged between the brake and a brake fluid by supplying and shutting off the pressure fluid to the brake, and a flow of the pressure fluid between the handbrake valve and the brake. An electromagnetic valve that opens and closes the road, a seat switch that detects whether the driver is seated, a parking brake switch that detects whether the parking brake is operated, and whether the vehicle is stopped The driver is seated based on the detected vehicle speed sensor and the signals from the seat switch, parking brake switch and vehicle speed sensor. And a controller that opens the electromagnetic valve when it is determined that all three conditions, that is, the parking brake is not operated and the vehicle is stopped, are satisfied. .

Further, according to the vehicle braking device of the second aspect of the present invention, the controller further determines whether the main switch for the vehicle is opened, the parking brake is operated, or the vehicle speed is changed. When it is determined that any one of the conditions greater than zero is satisfied, the electromagnetic valve is closed and the pressure fluid is controlled to be discharged through the electromagnetic valve.

According to a third aspect of the present invention, there is provided a vehicle braking device equipped with an alarm means for issuing an alarm that the driver is not seated.
While the electromagnetic valve is open and the brake is operating, the warning means is activated when it is determined that the driver is not seated based on the signal from the seat switch. There is.

According to the vehicle braking apparatus of the first aspect of the present invention, there are three conditions: the driver is seated, the parking brake is not operated, and the vehicle is stopped. When the controller determines that all are satisfied, the solenoid valve is opened to enter the braking preparation state. Next, when the driver operates the handbrake lever, the pressure fluid is supplied from the pressure fluid source to the brake via the solenoid valve, the brake operates, and the stopped state of the vehicle is maintained. Therefore, the driver does not have to continue to depress the brake pedal.

According to another aspect of the vehicle braking device of the present invention, the controller determines whether the vehicle main switch is open or the parking brake is operated.
Alternatively, when it is determined that one of the conditions that the vehicle speed is higher than zero is satisfied, that is, when it is determined that the service brake is no longer required, the electromagnetic valve is closed and the pressure fluid is supplied via the electromagnetic valve. Discharge and release the brake.

According to the vehicle braking device of the third aspect, when the driver leaves the driver's seat while the braking force is maintained and the vehicle is stopped, a warning is given to the driver. Can be given.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a vehicle braking device of the present invention, and FIGS. 2 to 4 are flow charts for explaining control contents of a controller.

According to the embodiment of the vehicle braking system of the present invention shown in FIG. 1, the air tank 10 which is a supply source of compressed air.
And front and rear brake boosters 11 and 12
And a brake pedal 1 arranged in a compressed air flow path between the air tank 10 and the brake boosters 11 and 12.
The service brake system including the brake valve 14 having the number 3 is operated by the hand brake lever 15 provided in the steering column, and the compressed air is sent from the air tank 10 to the brake boosters 11 and 12 to operate the brake. Hand brake valve 16 and
An electromagnetic valve 17 arranged in the compressed air flow path between the air outlet 16a of the handbrake valve 16 and the brake boosters 11, 12 and a controller 18 for controlling the electromagnetic valve 17 are arranged. .

The air tank 10 is a front tank 10a.
The rear tank 10b and the handbrake tank 10c are divided into three parts. The front tank 10a is connected to the front brake booth 11 via the lower side of the brake valve 14, the rear tank 10b is connected to the rear brake booster 12 via the upper side of the brake valve 14, and the hand brake tank 10c is , Is connected to the air inlet 16b of the handbrake valve 16.

The brake boosters 11 and 12 are provided with a power piston different from the master cylinder piston, and generate a large hydraulic pressure by increasing the force of the power piston. Operates with compressed air.

The brake valve 14 is a brake pedal 1.
It is a treadle type in which 3 and the valve are directly connected, and it is a dual brake valve, the valve case is divided into the upper side and the lower side, each equipped with an air inlet and an air outlet, and has a built-in valve, Compressed air is supplied to the rear system on the upper side and to the front system independently on the lower side.

The hand brake valve 16 has a structure similar to that of a trailer brake valve for operating a brake on the trailer side of an articulated vehicle, for example, although not shown in detail, a cam operated by a hand brake lever 15, A plunger / exhaust valve moved in the axial direction by the rotation of the cam, a feed valve having an air inlet 16b and an air outlet 16a, a piston for closing the feed valve, and a main spring for urging the piston. To do. Hand brake lever 1 on the driver's seat
When 5 is pulled to the front side, the cam rotates and pushes the plunger / exhaust valve to the right, for example, to close the exhaust valve and open the feed valve. As a result, compressed air from the handbrake tank 10c of the air tank 10 flows into the air inlet 16b and is sent to the air outlet 16a, and when the air pressure on the air outlet 16a side rises, the piston overcomes the force of the main spring and moves. And close the feed valve. At this time, since the exhaust valve remains closed, the compressed air pressure at the air outlet 16a is kept constant. That is, compressed air pressure corresponding to the operation angle of the handbrake lever 15 can be obtained. Compressed air from the air outlet 16b is sent to the brake boosters 11 and 12,
The brake boosters 11 and 12 are operated. This handbrake valve 16 uses compressed air,
Since it can be controlled by the control of the internal valve, unlike the parking brake, its hand brake lever 15
The operating power of is only small.

The controller 18 temporarily stores a CPU portion composed of a microcomputer, a ROM portion storing the control contents shown in the flowcharts of FIGS. 2 to 4 which are basic control contents of the CPU portion, a detection signal from a sensor and the like. A RAM part for temporarily storing the data and an interface part, and the input port of the interface part has a key power source 19, a seat switch 20 for detecting whether or not the driver is seated in the driver's seat, and a stopped state of the vehicle. A vehicle speed sensor 21 for detecting the vehicle speed and a parking brake switch 22 for detecting whether or not the parking brake is operated are connected, and the electromagnetic valve 1 is connected to the output port.
7, alarm lamp 23 and alarm buzzer 24 are connected.

When the vehicle main switch (not shown) is turned on, the controller 18 first performs initialization such as erasing the stored contents of the RAM portion, and then the seat switch 20, the vehicle speed sensor 21, and the parking brake switch 22. From these detection signals, the driver is seated in the driver's seat, the parking brake is not operated, and the vehicle is stopped. If it is determined that the electromagnetic valve 17 is present, an operation signal is sent to the electromagnetic valve 17 to open the electromagnetic valve 17.
Also, any one of the condition that the main switch for the vehicle is turned off, the parking brake is operated, or the vehicle is started by depressing the accelerator pedal and the vehicle speed sensor 21 detects "vehicle speed>0". When it is determined that the above condition is satisfied, a release signal is sent to the electromagnetic valve 17 to close the electromagnetic valve 17. Further, when it is determined that the driver is not seated in the driver's seat by the detection signal from the seat switch 20 while the vehicle braking is being performed while the braking force of the service brake is held by the vehicle braking device, An operation signal is sent to the alarm lamp 23 and the alarm buzzer 24. In this case, for example, the operation continues until it is determined that the driver is seated in the driver's seat by the detection signal from the seat switch 20.

Double check valves 25, 26 are provided in the compressed air flow path between the brake valve 14, the hand brake valve 16 and the brake boosters 11, 12. These double check valves 25 and 26 are 2
One air inlet, one air outlet, and a valve movably arranged in a flow path between the air inlet and the air outlet are provided, and compressed air from the higher pressure air inlet is supplied. It passes through the air outlet. That is, the valve is moved by the pressure of the compressed air to close the low-pressure air inlet, and the compressed air from the higher-pressure air inlet is passed to the air outlet.

The double check valve 25 on one side is switched to either the lower side of the brake valve 14 or the hand brake valve 16 to send compressed air to the brake booster 11 on the front side, and the double check valve 26 on the other side is By switching to either the upper side of the brake valve 14 or the hand brake valve 16, compressed air is sent to the brake booster 12 on the rear side.

A stop lamp switch 27 is arranged in the flow path between the lower side of the brake valve 14 and the double check valve 25, and a stop lamp switch 27 is arranged in the flow path between the upper side of the brake valve 14 and the double check valve 26. A stop lamp switch 28 is arranged.

Next, the operation of the vehicle braking system of the above embodiment will be described with reference to the flow charts of FIGS.

For example, when the vehicle is stopped for a short time by the service brake system by depressing the brake pedal 13 while waiting for a signal on an uphill, as shown in FIG. 2, if the main switch for the vehicle (not shown) is ON, First, the controller 18 is initialized, and then the controller 18 inputs the detection signals from the seat switch 20, the parking brake switch 22, and the vehicle speed sensor 21, and the driver is seated in the driver's seat based on these detection signals. , It is judged whether all three conditions of not operating the parking brake and that the vehicle is stopped are satisfied, and if it is judged that all three conditions are satisfied, the electromagnetic An operation signal is sent to the valve 17 to open the electromagnetic valve 17. Next, in this state, the driver holds the hand brake lever 1 on the steering column.
5 is operated, if the compressed air pressure from the air outlet 16a of the hand brake valve 16 is higher than the compressed air pressure from the brake valve 14, the double check valve 2
5 and 26 are switched, and the hand brake valve 16
Sends compressed air to the brake boosters 11 and 12,
The booster brake boosters 11 and 12 are actuated to apply the service brake, and the braking force is maintained to maintain the stopped state of the vehicle without continuously depressing the brake pedal 13. To release the service brake, the hand brake valve 16 is operated in the releasing direction by the hand brake lever 15 while operating the accelerator and the clutch.

While the vehicle is stopped, the controller 18
However, when the vehicle main switch is turned off, the parking brake is activated by the detection signal from the parking brake switch 22, or the accelerator pedal is depressed to start the vehicle, the vehicle speed sensor 21 displays "vehicle speed>".
When it is determined that any one of the conditions of detecting "0" is satisfied, a release signal is sent to the electromagnetic valve 17,
The electromagnetic valve 17 is closed. As a result, the electromagnetic valve 17
The compressed air is exhausted from the flow path on the downstream side of the electromagnetic valve 17 and the brake boosters 11 and 12 via the, and the service brake is released (see FIG. 3).

When the driver leaves the driver's seat while the vehicle is stopped, the controller 18 activates the alarm lamp 23 and the alarm buzzer 24 in response to a detection signal from the seat switch 20 to call the driver's attention. . When the driver returns to the driver's seat, the controller 18 stops the alarm lamp 23 and the alarm buzzer 24 in response to the detection signal from the seat switch 20 (see FIG. 4).

As described above, according to the vehicle braking device of the above-described embodiment, it is not necessary to continue to depress the brake pedal 13 when the vehicle is stopped for a short time on an uphill or the like, and the driver is not burdened. Further, there is no inconvenience of operating the parking brake with the parking brake lever, and the operating force of the lever is small. When the vehicle is started by operating the accelerator pedal and the clutch, the starting operation is performed while maintaining the braking operation in the initial stage, so that it is safe to avoid so-called rearward shifting of the vehicle on an uphill or the like. In this case, the handbrake lever 15 may be returned to the original position after starting. Further, since it is not necessary to continue depressing the brake pedal 13, it is not necessary to change the pedal from the brake pedal 13 to the accelerator pedal at the time of starting, which facilitates starting.

Further, conventionally proposed braking force holding devices (Japanese Patent Laid-Open No. 2-28041, Japanese Patent Laid-Open No. 59-143746, Japanese Patent Laid-Open No. 61-200).
No. 054 etc.) or a hill start assist device (Japanese Patent Laid-Open No. 3-96460) can be used, but compared to these devices, a complicated vehicle speed detection system and a cable for operating the parking brake lever Moreover, since a motor for winding the cable is not adopted, the structure is simple and the reliability is excellent.

Further, the structure can be simplified simply by adding the hand brake valve 16, the electromagnetic valve 17, etc., without making a great change to the existing service brake system.

The vehicle braking device of the present invention is not limited to the one shown in the above embodiment. For example, the handbrake valve 16 has a structure similar to that of the existing trailer brake valve, but the handbrake valve 16 is not limited to this, and the point is that a small lever operating force is sufficient. The control contents of the controller 18 are shown in FIG.
It is not limited to those shown in FIG.

[0032]

As described above, according to the vehicle braking device of the first aspect of the present invention, the hand operated by the hand brake lever for controlling the brake by supplying and shutting off the pressure fluid to the brake. Brake valve,
Since it consists of an electromagnetic valve that opens and closes the flow path of the pressure fluid between the handbrake valve and the brake, and a controller that controls the electromagnetic valve, the braking force is held by a simple lever operation and the vehicle is kept in a stopped state. Therefore, it is not necessary to continue depressing the brake pedal while the vehicle is stopped, and it can be used as a braking force holding system as an auxiliary to the parking brake.

According to another aspect of the vehicle braking device of the present invention, the controller determines whether the vehicle main switch is open or the parking brake is operated.
Alternatively, when it is determined that one of the conditions that the vehicle speed is higher than zero is satisfied, the electromagnetic valve is closed, the pressure fluid is discharged through the electromagnetic valve, and the brake is released. The release operation is easy, and the vehicle starts smoothly after stopping.

According to the vehicle braking device of the third aspect, when the driver leaves the driver's seat while the vehicle is stopped while holding the braking force, the driver is warned. It's safe to give.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a vehicle braking device of the present invention.

FIG. 2 is a flowchart illustrating control contents of a controller in a braking mode.

FIG. 3 is a flowchart illustrating control contents of a controller in a braking release mode.

FIG. 4 is a flowchart illustrating the control contents of the controller in the warning mode.

[Explanation of symbols]

10 Air Tank 18 Controller 11 Brake Booster 20 Seat Switch 12 Brake Booster 21 Vehicle Speed Sensor 14 Brake Valve 22 Parking Brake Switch 15 Hand Brake Lever 23 Warning Lamp 16 Hand Brake Valve 24 Warning Buzzer 17 Electromagnetic Valve

Claims (3)

[Claims] 1. A hand brake lever, which is disposed between a pressure fluid source and a brake that brakes a vehicle by the pressure fluid from the pressure fluid source, and controls the brake by supplying and shutting off the pressure fluid to and from the brake. Hand brake valve, an electromagnetic valve that opens and closes the flow path of pressure fluid between the hand brake valve and the brake, a seat switch that detects whether the driver is seated, and a parking brake The parking brake switch that detects whether the vehicle is parked, the vehicle speed sensor that detects whether the vehicle is stopped, and the driver based on the signals from the seat switch, the parking brake switch, and the vehicle speed sensor. That the vehicle is stationary, the parking brake is not operated, and the vehicle is stopped. There when it is determined that satisfies all, vehicular brake system characterized by comprising comprises a controller to open the solenoid valve. 2. The vehicular braking device according to claim 1, wherein the controller further has the main switch for the vehicle open, the parking brake is operated, or the vehicle speed is greater than zero. When it is determined that any one of the conditions is satisfied, the electromagnetic valve is closed, and control is performed so that the pressure fluid is discharged through the electromagnetic valve. 3. The vehicle braking device according to claim 1, further comprising alarm means for issuing an alarm when a driver is not seated, wherein the controller has the electromagnetic valve open and the brake. The vehicle braking device is characterized in that the alarm means is activated when it is determined that the driver is not seated based on the signal from the seat switch while the vehicle is operating.