JPH0728767U - Vehicle brake holding device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a device that automatically retains braking force when the vehicle is stopped, it operates only on level ground and uphill where it is necessary to keep the vehicle stopped, and when the wheels lock while traveling. (EN) Provided is a vehicle brake holding device that does not operate on a downhill. In a brake holding device including a solenoid valve 6 which is provided in a transmission path of a brake fluid pressure and which seals the brake fluid in a wheel cylinder 12 and releases the brake fluid, a forward torque applied to a brake pad 2 A signal from the first sensor 3 that detects the presence / absence, a vehicle stop state detection device 4 that detects the stop state of the vehicle, a signal from the first sensor 3 and the vehicle stop state detection device 4 is input, and a signal is output to the solenoid valve 6. And a signal processing unit 5 for
Is a solenoid valve only when the output from the first sensor 3 outputs a signal indicating that there is no torque in the forward direction and the output of the vehicle stop state detection device 4 outputs a signal indicating that the vehicle has stopped. 6 was operated to maintain the braking force.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle brake holding device, and more particularly to a device that prevents a vehicle from unintentionally moving on a flat ground or a slope.

[0002]

[Prior art]

 In recent years, various brake holding devices for vehicles have been proposed which prevent the vehicle from moving carelessly on a flat ground or a slope. For example, the one disclosed in Japanese Utility Model Laid-Open No. 57-66957 discloses a brake detection device for detecting a foot brake operation, an accelerator detection device for detecting an accelerator pedal operation, and a vehicle speed detection device for detecting a vehicle speed. A brake holding device that outputs an instruction signal to the braking device based on the signal from each device is provided, and this brake holding device transmits and holds a stop command to the braking device when the foot brake is operated and the vehicle speed becomes zero. At the same time, when the accelerator pedal is subsequently operated, a release signal is transmitted to the braking device.

Separately from this, as shown in, for example, Japanese Patent Laid-Open No. 63-227452, a reverse torque generated when a vehicle is stopped on an uphill at a portion of a disc brake that holds a brake pad. In some systems, a switch for detecting is detected and the brake holding device is activated by the output signal from this switch.

[0004]

[Problems to be solved by the device]

 However, the former one of the above-mentioned prior arts operates on all road surfaces of uphill and downhill as well as on flat ground, and has the following drawbacks.

That is, since this prior art determines the instruction signal from the brake holding device to the brake device based on the signal of the brake detection device and the signal of the vehicle speed detection device, it travels on a slippery road surface, for example. Even if the wheels lock up as a result of sudden braking, there is a risk that the vehicle will be stopped and the brake holding device will be kept in the brake holding state, which is dangerous.

It is preferable that the brake holding device of this type does not operate on a downhill. This is because on a normal vehicle that does not have a brake holding device on a downhill, stopping and starting the vehicle can be performed simply by stepping on and releasing the foot brake, but when the brake holding device operates, When stopping or starting the vehicle, the brake pedal and the accelerator pedal must be alternately stepped on. Therefore, if you are congested on a downhill, you have to perform this operation frequently, which is troublesome. Also, if the vehicle is started on a downhill by operating the accelerator, there is a risk that the vehicle may suddenly start suddenly.

In the latter case, the system operates only on an uphill, and has the following drawbacks. In other words, this conventional technique detects the reverse torque of the vehicle on an uphill slope and operates the brake holding device based on the signal, so the brake holding device operates on level ground where no reverse torque is generated in the vehicle. do not do. In other words, this device may be used to smoothly start uphill, but the brake holding device can be used to prevent accidental collision due to a rear-end collision when stopping on a congested road or waiting for a signal. It is also desirable to use it for safety, as this device only works on uphill slopes and therefore is not sufficiently safe.

The present invention has been made in view of the above-mentioned matters, and in an apparatus that automatically retains braking force when a vehicle is stopped, the apparatus is operated only on a flat ground or an uphill where it is necessary to keep the vehicle stopped and the vehicle travels. It is an object of the present invention to provide a brake holding device for a vehicle that does not operate when the wheels are locked inside or on a downhill.

[0009]

Means for Solving the Problems The present invention is directed to a brake holding device including a solenoid valve 6 which is provided in a transmission path of a brake fluid pressure and which encloses the brake fluid in a wheel cylinder 12 and releases the brake fluid. The first sensor 3 that detects the presence or absence of the forward torque applied to the brake pad 2, the vehicle stop state detection device 4 that detects the stop state of the vehicle, and the first sensor 3 and the vehicle stop state detection device 4 And a signal processing unit 5 that outputs a signal to the solenoid valve 6, and the signal processing unit 5 outputs a signal indicating that the output from the first sensor 3 has no torque in the forward direction. Is output, and the braking force is maintained by operating the electromagnetic valve 6 only when the output of the vehicle stop state detection device 4 outputs a signal indicating that the vehicle is stopped. For It was over key retainer.

As a second configuration, in a brake holding device provided with a solenoid valve 6 that is provided in a transmission path of brake fluid pressure and that confines the brake fluid pressure in the wheel cylinder 12 and releases it, a brake pad 2 is provided. A first sensor 3 that detects the presence or absence of a given forward torque, a vehicle stop state detection device 4 that detects the stop state of the vehicle, and a second sensor that detects whether or not the trans mission is set to the reverse position. The sensor 7 and a signal processor 5 for receiving signals from the first sensor 3, the vehicle stop state detection device 4, and the second sensor 7 and outputting a signal to the solenoid valve 6 are provided. Outputs a signal that the output from the first sensor 3 indicates that there is no torque in the forward direction, and the output of the vehicle stop state detection device 4 outputs a signal that the vehicle has stopped. For the vehicle, the solenoid valve 6 is operated to hold the braking force when the output from the second sensor 7 is outputting a signal indicating that the output is not set to the reverse position. The brake holding device was used.

In the second configuration, the signal processing unit 5 outputs a signal indicating that the output from the first sensor 3 has a torque in the forward direction, and the output of the vehicle stop state detection device 4. The solenoid valve 6 is operated when the vehicle outputs a signal indicating that the vehicle is stopped and the output from the second sensor 7 indicates that the output is set to the reverse position. The braking force may be retained.

[0012]

[Action]

 When the vehicle stops uphill, the brake pad 2 of the brake 1 is biased in the backward direction. Therefore, the first sensor 3 that detects the presence or absence of the forward torque applied to the brake pad 2 outputs a signal indicating that the torque is not detected.

On the other hand, since the vehicle is stopped, the vehicle stop state detection device 4 that detects the stop state of the vehicle outputs a signal indicating that the vehicle is stopped (detection). In the signal processing unit 5 which receives the signals from the first sensor 3 and the vehicle stop state detection device 4, the output from the first sensor 3 outputs a signal indicating that there is no torque in the forward direction, and Since it is determined whether or not the output of the vehicle stop state detection device 4 outputs a signal indicating that the vehicle has stopped, the signal processing unit 5 is operated under the condition when the vehicle is stopped on an uphill. The condition is met, and an operation signal is sent to the solenoid valve 6.

As a result, the vehicle automatically holds the braking force at the stopped position. Here, when the start operation is performed, the brake pad 2 of the brake 1 is urged in the forward direction. Therefore, the first sensor 3 that detects the presence or absence of the forward torque applied to the brake pad 2 outputs a signal indicating the detection.

On the other hand, since the vehicle is stopped, the vehicle stop state detection device 4 that detects whether or not the vehicle is stopped outputs a signal indicating the detection. Under this condition, the condition set in the signal processing unit 5 is not met, so a signal to operate the solenoid valve 6 is not sent.

With this, the brake of the vehicle is automatically released, and the vehicle can be started normally. Further, in the second configuration, a second sensor 7 for detecting whether or not the transmission is set to the reverse position is added to the above configuration, and these first sensor 3, vehicle stop state detection device 4, and 2 The signal processing unit 5 detects each level of the signal from the sensor 7 and makes a determination.

That is, when the vehicle is stopped on an uphill, the first sensor 3 outputs a signal indicating that there is no torque in the forward direction, and the output of the vehicle stop state detection device 4 stops the vehicle. Is outputting a signal to the effect. Here, when the transmission is set to the reverse position, the second sensor 7 outputs a detection signal.

Under the above conditions, the signal processing unit 5 does not operate the solenoid valve 6, but operates the solenoid valve 6 when the transmission is set to a position other than reverse. Next, in the second configuration, when the vehicle stops on a downhill and the transmission is set to the reverse position, the brake pad 2 of the brake 1 is urged in the forward direction. Therefore, the first sensor 3 for detecting the presence or absence of the forward torque applied to the brake pad 2 outputs a signal indicating the detection, that is, a signal indicating the forward torque. Further, the output of the vehicle stop state detection device 4 outputs a signal indicating that the vehicle is stopped. Since the transmission is set to the reverse position, the output from the second sensor 7 becomes a signal indicating the detection.

Even under the above conditions, the signal processing unit 5 sends a signal indicating that the solenoid valve 6 is to be operated.

[0020]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. <Example 1> Example 1 will be described with reference to Figs.

The brake 1 provided on the vehicle is a disc brake, and has a brake pad 2 that holds the disc 1a. A first sensor 3 that detects the presence or absence of a torque applied to the brake pad 2 in the forward direction (F direction shown by the arrow) is provided at a portion holding the brake pad 2. The first sensor 3 outputs a high level signal only when the forward torque is detected.

A vehicle stop state detection device 4 for detecting whether or not the vehicle is stopped is provided in a speedometer (not shown), and outputs a high level signal only when the vehicle is stopped. . The signals from the first sensor 3 and the vehicle stop state detection device 4 are input to the signal processing unit 5 in the next stage. A solenoid valve 6 is connected to a stage subsequent to the signal processing unit 5.

The solenoid valve 6 connects a master cylinder 13 that pushes out brake pressure fluid by depressing the brake pedal 20 and a wheel cylinder 12 that brakes wheels by fluid pressure from the master cylinder 13. It is installed on the liquid path. The solenoid valve 6 has a solenoid coil and a movable iron core that opens and closes the valve, and in response to an instruction signal from the signal processing unit 5, the valve is opened and closed to maintain the brake fluid pressure in the wheel cylinder 12.・ To cancel. That is, when the brake pedal 20 is depressed to stop the vehicle, the brake fluid pressure is maintained and the braking force is maintained even when the foot is released from the brake pedal 20. A bypass fluid passage having a check valve 14 interposed is connected between both ends of the solenoid valve 6 to allow transmission of pressure from the master cylinder 13 side to the wheel cylinder 12 side. Therefore, at the time of repressurization by the driver's operation of the brake pedal, the pressure is supplied from the master cylinder 13 side to the wheel cylinder 12 side through the check valve 14.

The signal processing unit 5 outputs a signal indicating that the output from the first sensor 3 has no torque in the forward direction, and the output of the vehicle stop state detection device 4 indicates a signal indicating that the vehicle has stopped. A signal is sent to the solenoid valve 6 only when the is output to maintain the braking force.

FIG. 3 shows a specific logic circuit diagram, and shows that the first sensor 3 is a torque switch, and the vehicle stop state detection device 4 is composed of a wheel speed sensor 4a and a zero speed determination unit 4b. There is. Further, a back gear switch 7 is provided for detecting whether or not the transmission is set to the reverse position. This back gear switch 7 is an additional one in this embodiment.

The respective outputs of the first sensor 3 and the second sensor 7 are input to the 3-input AND circuit A via the inverter R, and the output of the vehicle stop state detecting device 4 is directly input to the 3-input AND circuit A. Has been entered in.

Here, the operation will be described assuming that the vehicle is stopped on an uphill. First, the brake pad 2 of the brake 1 is biased in the backward direction. Therefore, the first sensor 3 that detects the presence or absence of the forward torque applied to the brake pad 2 outputs a signal (low level) indicating that the torque is not detected.

On the other hand, since the vehicle is stopped, the vehicle stop state detection device 4 for detecting whether or not the vehicle is stopped outputs a signal indicating the detection. Therefore, the output from the first sensor 3 is inverted and input as a high level signal, and the output from the vehicle stop state detection device is input as it is as a high level signal. Further, the transmission is set to a position other than reverse, and the second sensor 7 outputs a low level, which is inverted and input as a high level.

Under the above conditions, the operation condition of the signal processing unit 5 is satisfied, and the electromagnetic valve 6 is operated to maintain the braking force for holding the position of the vehicle. As a result, the vehicle automatically maintains the braking force at the stopped position.

Here, when the start operation is performed, the brake pad 2 of the brake 1 is urged in the forward direction. Therefore, the first sensor 3 that detects the presence or absence of the forward torque applied to the brake pad 2 outputs a detection signal (high level). At this time, the low level is input to the 3-input AND circuit A.

On the other hand, since the vehicle is stopped, the vehicle stop state detection device 4 that detects whether or not the vehicle is stopped continues to output a signal indicating the detection. Under this condition, the condition set in the signal processing unit 5 is not met, so that no signal is sent to the solenoid valve 6.

Therefore, the brake of the vehicle is automatically released, and the vehicle can start normally. The above operation is similarly performed on the flat ground. Example 2 Example 2 will be described with reference to FIGS. 4 and 5. The same parts as those of the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, the second sensor (back gear switch) 7 for detecting whether or not the transmission is set to the reverse position is an essential element in the above configuration.

In this embodiment, two 3-input AND circuits A 1 and A 2 are provided, and the outputs of the first sensor 3, the vehicle stop state detection device 4, and the second sensor 7 are the first 3-input AND circuit. A1 and the second 3-input AND circuit A2 are input. That is, the output of the first sensor 3 is input to the first three-input AND circuit A1 via the inverter R and directly to the second three-input AND circuit A2. Further, the output of the vehicle stop state detecting device 4 is directly input to the first 3-input AND circuit A1 and the second 3-input AND circuit A2. Furthermore, the output of the second sensor 7 is input to the first 3-input AND circuit A1 via the inverter R and directly to the second 3-input AND circuit A2. The outputs of the first 3-input AND circuit A 1 and the second 3-input AND circuit A 2 are input to the OR circuit B, and the output of the OR circuit B 1 controls the solenoid valve 6.

With the above configuration, the operation will be described when the vehicle is stopped on an uphill. Since the first sensor 3 outputs a signal (low level) indicating that there is no torque in the forward direction, the input of the first 3-input AND circuit A1 is high level, and the input of the second 3-input AND circuit A2 is Low level input. On the other hand, the output of the vehicle stop state detection device 4 is a high level input to both the first 3-input AND circuit A1 and the second 3-input AND circuit A2 because it outputs a signal indicating that the vehicle has stopped.

Here, when the transmission is set to the reverse position, the second sensor 7 outputs a detection signal, so that the first three-input AND circuit A1 has a low level input and a second three input. The AND circuit A2 has a high level input.

Under the above conditions, the output of the first 3-input AND circuit A1 becomes low level, and the output of the second 3-input AND circuit A2 also becomes low level, and the solenoid valve 6 does not operate. Therefore, the automatic brake is released when backing uphill.

Here, when the transmission is set to a position other than reverse, the second sensor 7 outputs a non-detection signal, so that the first 3-input AND circuit A1 receives the high level input, The 3-input AND circuit A2 becomes a low level input. Therefore, the inputs of the first 3-input AND circuit A1 are all at the high level, and the output of the OR circuit B is at the high level. As a result, a signal to the effect that the braking force is maintained is sent to the solenoid valve 6.

Next, when the vehicle is downhill and the transmission is set to the reverse position, the brake pad 2 of the brake 1 is urged in the forward direction. Therefore, the first sensor 3 for detecting the presence or absence of the forward torque applied to the brake pad 2 outputs a signal indicating the detection, that is, a signal indicating the forward torque (high level). Therefore, the first 3-input AND circuit A1 has a low level input, and the second 3-input AND circuit A2 has a high level input. Further, since the output of the vehicle stop state detection device 4 outputs a signal indicating that the vehicle is stopped, both the first 3-input AND circuit A1 and the second 3-input AND circuit A2 are high level inputs.

Here, since the output from the second sensor 7 is a detection signal, the first 3-input AND circuit A1 is a low level input and the second 3-input AND circuit A2 is a high level input. Becomes In this state, the output of the second three-input AND circuit A2 becomes high level, and the OR circuit B sends a signal to operate the solenoid valve 6.

When the operation for backing is performed here, the torque in the forward direction given to the brake pad 2 disappears, the output of the second three-input AND circuit A2 becomes low level, and The signal for holding the brake pressure in the cylinder 12 is no longer sent, and the vehicle is ready to run.

As described above, according to the present embodiment, in the device that automatically maintains the brake pressure when the vehicle stops, the wheel cylinder inside the wheel cylinder when the vehicle stops on the uphill and the level ground during forward traveling. Brake pressure is contained, and if stopped on a downhill, brake pressure is not contained. Therefore, the operation for releasing the brake pressure on the downhill (the operation of the accelerator pedal) is not necessary, and the risk of sudden start on the downhill is eliminated.

Further, when the vehicle goes backward on a downhill, the brake pressure is confined until the vehicle starts, so that the operability of the vehicle can be improved. In addition, the present embodiment is configured so that the solenoid valve 6 does not operate when torque in the forward direction is generated in the brake pad 2. Therefore, even if the wheels are locked due to a sudden break while traveling, the forward direction torque is generated in the brake pads 2 of the locked wheels due to the frictional resistance with the road surface, and the solenoid valve 6 does not operate. Is.

As a modified example, a vehicle speed sensor may be used instead of the wheel speed sensor 4a.

[0045]

[Effect of device]

 According to the present invention, in the device that automatically maintains the braking force when the vehicle is stopped, it operates only on level ground and uphill where it is necessary to keep the vehicle stopped, and when the wheels are locked while traveling or when the wheels are downhill. It is possible to obtain a vehicle brake holding device that does not operate on a slope.

[Brief description of drawings]

FIG. 1 is a side view of a first sensor portion showing an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a first embodiment of the present invention.

FIG. 3 is a logic circuit diagram showing a first embodiment of the present invention.

FIG. 4 is a conceptual diagram showing a second embodiment of the present invention.

FIG. 5 is a logic circuit diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 1 ... Brake 1a ... Disc 2 ... Brake pad 3 ... First sensor (torque switch) 4 ... Vehicle stop state detection device (speed sensor) 4a ... Speed sensor 4b ... Zero speed determination unit 5 ... Signal processing unit 6 ... Solenoid valve 7 ... Second sensor (back gear switch) 12 ... Wheel cylinder 13 ... Master cylinder 14 ... Check valve 20 ... Brake pedal A ... 3 input and circuit A1 ... 1 3-input AND circuit A2 ... Second 3-input AND circuit B ... OR circuit

Claims (3)

[Scope of utility model registration request] 1. A brake holding device comprising a solenoid valve (6) interposed in a brake hydraulic pressure transmission path for confining and releasing brake hydraulic fluid in a wheel cylinder (12), comprising a brake pad (2). Sensor (3) for detecting the presence or absence of a forward torque applied to the vehicle, a vehicle stop state detection device (4) for detecting the stop state of the vehicle, and the first sensor (3) and the vehicle stop state detection device A signal processing unit (5) for inputting a signal from (4) and outputting a signal to the solenoid valve (6), wherein the signal processing unit (5) outputs from the first sensor (3). Outputs a signal indicating that there is no torque in the forward direction, and the output of the vehicle stop state detection device (4) outputs a signal indicating that the vehicle has stopped, the solenoid valve (6).
A brake holding device for a vehicle, wherein the brake holding device for a vehicle is configured to be operated to hold a braking force. 2. A brake holding device comprising a solenoid valve (6) which is provided in a transmission path of a brake fluid pressure and which confines and releases the brake fluid pressure in a wheel cylinder (12), comprising a brake pad (2). A first sensor (3) for detecting the presence or absence of torque in the forward direction applied to the vehicle, a vehicle stop state detection device (4) for detecting the vehicle stop state, and whether or not the transmission is set in the reverse position Signals from the second sensor (7), the first sensor (3), the vehicle stop state detection device (4), and the second sensor (7), and outputs the signal to the solenoid valve (6). And a signal processing unit (5) that outputs a signal indicating that the output from the first sensor (3) has no torque in the forward direction, and the vehicle is in a stopped state. Detector When the output of 4) is outputting a signal indicating that the vehicle is stopped and the output of the second sensor (7) is outputting a signal indicating that the reverse position is not set, the solenoid valve (6 ) Is operated to hold the braking force, the vehicle brake holding device. 3. The signal processing section (5) outputs a signal indicating that the output from the first sensor (3) has torque in the forward direction, and the vehicle stop state detection device (4). The solenoid valve (6) is actuated when the output outputs a signal indicating that the vehicle is stopped and the output from the second sensor (7) indicates that the output is set to the reverse position. A brake holding device for a vehicle, which is configured to hold the braking force.