JP2578333Y2 - Parking brake release device - Google Patents

Description

[Detailed description of the invention]

[0001]

Industrial Applicability The present invention outputs a signal to a parking brake release forgetting warning device and releases a locking device for a parking brake lever when the vehicle speed exceeds a predetermined vehicle speed and the parking brake temperature exceeds the predetermined temperature. The present invention relates to a parking brake release device including a control device for operating a parking brake forced release actuator and a confirmation switch for releasing the signal output.

[0002]

2. Description of the Related Art A pilot lamp of a parking brake is not turned on due to a disconnection, so it is erroneously recognized that the parking brake has been released, or when the parking brake lever operating force is insufficient, the driver forgets to release the parking brake and travels to brake. Overheating may cause a runaway accident due to reduced braking power. In order to avoid such an accident, for example, Japanese Unexamined Utility Model Publication No. Sho 62-149470 by the present applicant is disclosed, and it is known that an alarm is issued when the operating force of the parking brake is insufficient. Furthermore, the same is applied to the actual application 4-425.
According to No. 5, a warning is issued when the brake is overheated.

However, in the technology disclosed in Japanese Utility Model Application Laid-Open No. 62-149470 or Japanese Utility Model Application No. 4-4255,
Since it is not detected that the parking brake has been forgotten to be released, it cannot be automatically released. For this reason, if the vehicle travels while the release of the parking brake is insufficient, an alarm is issued. However, if the alarm is ignored, the parking brake is overheated. Japanese Patent Publication No. 49-48695 discloses a technique of detecting a torsion of a rotating shaft of a vehicle and detecting forgetting to release a parking brake. However, such a known technique cannot automatically prevent forgetting to release the parking brake, and it is difficult to detect torsion. Further, Japanese Patent Publication No. 49-48696 discloses a technique for forcibly releasing the parking brake. However, it is difficult to detect that the parking brake has been forgotten due to the twist of the rotating shaft. Japanese Utility Model Laid-Open Publication No. Sho 52-130819 discloses a technology for detecting the temperature of a parking brake and alerting the driver to forget to release the parking brake. However, it is not possible to forcibly disclose the parking brake in such known technology.

[0004]

Therefore, the object of the present invention is to easily detect that the parking brake has been forgotten to be released,
Another object of the present invention is to provide a parking brake release device capable of forcibly releasing the parking brake during traveling.

[0005]

According to the present invention, there is provided a parking brake release device having a lock device for locking a parking brake of a vehicle in a parking brake operating state, a parking brake forced release actuator for releasing the lock device, A temperature sensor that measures the temperature of the parking brake, a vehicle speed sensor that measures the vehicle speed of the vehicle, a control device that activates the parking brake forced release actuator according to a signal from the temperature sensor, and a parking brake release forgetting alarm device A confirmation switch for canceling the output from the control device, wherein the control device receives a signal from the temperature sensor when the vehicle is at a certain vehicle speed or more by a signal from the vehicle speed sensor and the main brake is not operated. Release parking brake when it is determined that the parking brake temperature is above a certain temperature A function to output an alarm signal to the alarm device to activate the parking brake forced release actuator to release the parking brake forcibly, and to stop the output signal to the warning device for forgetting to release the parking brake when the confirmation switch is pressed. Have.

[0006]

In the parking brake release device configured as described above, when the vehicle is driven while the parking brake lever is locked in the parking brake operating state, the vehicle speed sensor detects the vehicle speed and the vehicle speed becomes equal to or higher than a predetermined vehicle speed, and A temperature sensor detects the rising temperature of the sliding portion of the parking brake, and when the temperature exceeds a certain value, automatically issues an alarm via the control device and the parking brake forced release actuator releases the locked state of the parking brake. I do. The alarm device that issues the alarm is released and cleared by the confirmation switch.

[0007] Therefore, even if the driver forgets to release the parking brake and travels, the system detects that the release is forgotten and automatically releases it, preventing overheating of the brake.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a parking brake release device embodying the present invention. In the figure, a drum type parking brake 1 has a pair of shoes 4 to which a drum 2 and a lining 3 are respectively adhered. The temperature sensor 5 is attached to one shoe 4. An arm 6 for expanding the pair of shoes 4 to press the lining 3 against the drum 2 is connected to one end of a parking brake lever 8 (hereinafter simply referred to as a lever) via a link 7. The lever 8 is pivotally mounted on a support shaft 9 and a hand push knob 10 is arranged at the other end. When the hand push knob 10 is pushed, the ratchet 11 pivotally supported by the lever 8 rotates counterclockwise in the drawing to release the lock state with the cam 12 fixedly mounted on the support shaft 9. . In this case, the locking device is the ratchet 1
1 and a cam 12. Push knob 1
The parking brake is released by rotating the lever 8 in the counterclockwise direction in the figure while pushing 0. A parking brake forcible release actuator (hereinafter abbreviated as an actuator) 12 substantially integrated with the ratchet 11 includes a solenoid portion 13 and a plunger 14. I have. At all times, that is, when power is not supplied, a compression spring 15 is elastically mounted on the plunger 14 so as to urge the ratchet 11 in a direction to engage the cam 12. Although the figure shows the case of a drum type parking brake, in the case of a disk type, it goes without saying that the temperature sensor is connected to the parking brake lever via a link and the pad tightening mechanism attached to the pad. Absent.

The control unit 16 receives detection signals from the temperature sensor 5, the vehicle speed sensor 17a and the main brake line pressure sensor 17b, and the temperature sensor and the vehicle speed sensor each exceed a certain value. When the pressure falls below a certain value, the actuator 12 and the parking brake release forgetting warning device (hereinafter abbreviated as a warning device) 1
8 so as to output a signal. Alarm device 1
8 is an alarm lamp 19, an alarm display 20, an alarm buzzer 2
1. It has an alarm speaker 22 and an auxiliary output by voice. Reference numeral 23 denotes a confirmation switch. When the confirmation switch 23 is operated, the operation of the alarm device 18 is released via the control device 16. The main brake line pressure sensor 17b is necessary when the parking brake is linked with the main brake, and is unnecessary when the parking brake is independent from the main brake line.

Further, although only one temperature sensor is shown in the figure, when there are a plurality of brakes to which the parking brake operates, a temperature sensor is attached to each brake, and all the signals of each sensor are inputted to the control device. It is wired to.

Next, the operation will be described mainly with reference to FIG.

FIG. 2 shows a flow chart. In this figure, when the power is turned on by the operation of the key switch,
It is determined whether or not the vehicle is stopped by the vehicle speed sensor (step S
1) If NO, that is, if the vehicle is running, it is determined whether or not the main brake is operating (step S2). If no
That is, if the main brake is released, it is determined whether the parking brake has exceeded the reference temperature (step S3).
-1 to N). The illustrated example shows the case where the number of parking brakes is N, and if any one is YES, that is, if the temperature exceeds the reference temperature, an alarm flag is set as described later. If all of steps S3-1 to N are NO, that is, if the parking brake temperature does not exceed the reference temperature, it is determined whether or not the alarm flag is set (step S3).
4). If YES, that is, if the alarm flag is set, the alarm flag is cleared (step S
5) Stop the alarm signal (Step S6), stop the operation of the alarm (Step S7), and return to Step S1. On the other hand, as described above, if any of steps S3-1 to SN is YES, that is, if any of the parking brake temperatures exceeds the reference temperature, an alarm flag is set (step S8) and an alarm signal is output. (Step S
9) Activate the alarm (step S10), forcibly release the parking brake (step S11), clear the timeout counter (step S12), and determine whether the confirmation switch has been pressed (step S12). S1
3). If NO, that is, if the confirmation switch has not been pressed, the timeout counter is incremented by one (step S14), and it is determined whether or not the time has reached the upper limit value (step S15). If so, return to step S1 again, if NO,
That is, if the time has not reached the upper limit, the process returns to step S13 again. If YES in step S13, that is, if the confirmation switch is pressed, the alarm signal is stopped (step S16), the operation of the alarm is stopped (step S17), and the alarm flag is cleared (step S1).
8), the timer is activated (step S1).
9). After the timer operates for a fixed time of 1 to 2 seconds, the operation is stopped, and the process returns to step S1.

[0014]

[Effects of the Invention] As described above, the present invention has the following excellent effects. (A) Since forgetting to release the parking brake is detected by the temperature sensor for detecting the temperature of the parking brake and the vehicle speed, it is possible to easily and reliably detect forgetting to release the parking brake. (B) Since the lock is forcibly released by the parking brake forcible release actuator, a runaway accident due to overheating of the brake can be automatically prevented. (C) Since an alarm is issued to the driver and a confirmation switch is provided, the driver can surely confirm that he / she has forgotten to release the parking brake, which is extremely preferable for safe driving.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart of control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Parking brake 2 ... Drum 3 ... Lining 4 ... Shoe 5 ... Temperature sensor 6 ... Arm 7 ... Link 8 ... Parking brake lever 9 ... Support shaft DESCRIPTION OF SYMBOLS 10 ... Hand push knob 11 ... Ratchet 12 ... Parking brake forced release actuator 13 ... Solenoid part 14 ... Plunger 15 ... Compression spring 16 ... Control device 17a ... Vehicle speed sensor 17b ... Main brake line pressure sensor 18 ... Parking brake release forgetting alarm device 19 ... Alarm lamp 20 ... Alarm display 21 ... Alarm buzzer 22 ... Alarm speaker 23 ... Confirmation switch

Continuation of front page (56) References JP-A-57-15057 (JP, A) JP-A-55-119553 (JP, A) JP-A 52-130819 (JP, U) JP-A 62-170369 (JP, A) , U) Japanese Utility Model Showa 63-193978 (JP, U) Japanese Utility Model Utility Model No. 2-5367 (JP, U) Japanese Utility Model Utility Model No. 2-121373 (JP, U) Japanese Utility Model Utility Model No.3-9966 (JP, U) 49-48695 (JP, B1) JP-B-49-48696 (JP, B1) JP-B-49-48697 (JP, B1) Jiko-sho 44-14754 (JP, Y1) (58) Fields surveyed (Int. Cl. ⁶ , DB name) B60T 17/22

Claims (1)

(57) [Scope of request for utility model registration] 1. A parking brake release device comprising a lock device for locking a parking brake of a vehicle in a parking brake operating state, a parking brake forcible release actuator for releasing the lock device, a temperature sensor for measuring a temperature of the parking brake, and A vehicle speed sensor for measuring the vehicle speed of the vehicle,
A control device for operating the parking brake forced release actuator in accordance with a signal from the temperature sensor, and a confirmation switch for releasing an output from the control device to the parking brake release forgetting alarm device, wherein the control device includes a vehicle speed sensor When the vehicle brake is determined to be at or above a certain temperature based on a signal from the temperature sensor when the vehicle is at or above a certain vehicle speed based on a signal from the vehicle and the main brake is not operated. A parking brake is forcibly released by outputting a warning signal to the parking brake forcible release actuator, and stopping the output signal to the parking brake release forgetting alarm device when the confirmation switch is pressed. Characteristic parking brake release device.