JPH0625071U - Parking brake release device - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention detects forgetting to release the parking brake and automatically releases it to prevent a runaway accident due to overheating of the brake. [Structure] Parking brake temperature sensor and vehicle speed sensor 17a
And a control device 16 for forcibly releasing the lock of the parking lever in the brake state and activating the parking brake release forgetting alarm device 18, and a control device 16 for the parking brake release forgetting alarm device 18. And a confirmation switch 23 for canceling the output from.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention outputs a signal to the parking brake release forgetting alarm device and releases the parking brake lever lock device when the vehicle speed exceeds a certain speed and the parking brake temperature exceeds a certain temperature. The present invention relates to a parking brake release device including a control device for activating the vehicle and a confirmation switch for releasing the signal output.

[0002]

[Prior art]

 Since the parking brake pilot lamp does not light up due to the disconnection, it is mistakenly recognized that the parking brake has been released, or when the parking brake lever operation force is insufficient, the driver forgets to release the parking brake and runs to overheat the brake to reduce the braking force. It may cause a runaway accident. In order to avoid such an accident, for example, Japanese Utility Model Laid-Open No. 62-149470 disclosed 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. Further, according to Japanese Utility Model Application No. 4-42555, an alarm is issued when the brake is overheated.

[0003]

[Problems to be solved by the device]

 However, in the technique disclosed in Japanese Utility Model Laid-Open No. 62-149470 or Japanese Patent Application No. 4-4255, the forgetting to release the parking brake is not detected, and therefore it cannot be automatically eliminated. For this reason, an alarm is issued if the vehicle is driven with the parking brake released inadequately, but if the alarm is ignored, the parking brake will overheat.

An object of the present invention is to provide a parking brake release device that detects forgetting to release the parking brake and automatically releases it to prevent overheating of the brake.

[0005]

According to the present invention, in a parking brake release device including a locking device that locks a parking brake lever in a parking brake operating state, a parking brake forced release actuator that releases the locking device is provided. , A temperature sensor that measures the temperature of the parking brake, a vehicle speed sensor that measures the vehicle speed of the vehicle, and a signal to the parking brake release forgetting alarm device when the temperature of the parking brake exceeds a certain temperature when the vehicle speed is above a certain speed. A control device for outputting and operating the parking brake forced release actuator and a confirmation switch for releasing the output from the control device to the parking brake release forgetting alarm device are provided.

[0006]

[Explanation of effects]

 In the parking brake release device configured as described above, when the vehicle is running with the parking brake lever locked while the parking brake is operating, the vehicle speed sensor detects the vehicle speed and the vehicle speed becomes a certain vehicle speed or more, and the temperature sensor detects the parking brake slide. When the rising temperature of the moving part is detected and the temperature exceeds a certain value, an alarm is automatically issued via the control device and the parking brake forced release actuator releases the parking brake locked state. The alarm device for issuing the alarm is cleared and cleared by the confirmation switch.

Therefore, even if the driver forgets to release the parking brake and travels, the present device detects the forgetting to release the brake and automatically releases the brake, so that overheating of the brake is prevented in advance.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a parking brake releasing 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 attached, respectively. The temperature sensor 5 is attached to one shoe 4. An arm 6 for expanding a 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 abbreviated as lever) via a link 7. The lever 8 is pivotally attached to a support shaft 9, and a hand push knob 10 is arranged at the other end. When the manual push knob 10 is pushed, the ratchet 11 pivotally supported by the lever 8 rotates counterclockwise in the figure, and the lock state with the cam 12 fixed to the support shaft 9 is released. ing. In this case, the locking device consists of a combination of ratchet 11 and cam 12. The parking brake is released by rotating the lever 8 in the counterclockwise direction in the figure while pushing the manual push knob 10. A parking brake forced release actuator (hereinafter abbreviated as actuator) 12 disposed substantially integrally with the ratchet 11 is composed of a solenoid portion 13 and a plunger 14, and the tip of the plunger 14 is pivotally attached to the free end of the ratchet 11. There is. The compression spring 15 is elastically mounted on the plunger 14 so as to urge the ratchet 11 to engage the cam 12 at all times, that is, when the power is not supplied. Although the figure shows the case of a drum type parking brake, in the case of a disc type, the temperature sensor is attached to the pad.It is said that the pad tightening mechanism is connected to the parking brake lever via a link. There is no end.

The detection signals from the temperature sensor 5, the vehicle speed sensor 17a and the main brake line pressure sensor 17b are input to the control device 16, the temperature sensor and the vehicle speed sensor each exceed a certain value, and the main brake line pressure is exceeded. It is wired so as to output a signal to the actuator 12 and the parking brake release forgetting alarm device (hereinafter abbreviated as alarm device) 18 when the sensor falls below a certain value. The alarm device 18 includes an alarm lamp 19, an alarm indicator 20, an alarm buzzer 21, an audio alarm speaker 22 and an auxiliary output. Reference numeral 23 indicates a confirmation switch, and 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 not necessary when the parking brake is independent of the main brake line.

Furthermore, although only one temperature sensor is shown in the figure, if there are multiple brakes that act on the parking brake, a temperature sensor is attached to each brake and all signals from each sensor are input to the control device. To be wired.

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

FIG. 2 shows a flow chart, in which when the power is turned on by the operation of the key switch, the vehicle speed sensor determines whether or not the vehicle is stopped (step S1). If so, it is determined whether or not the main brake is in operation (step S2). If NO, that is, if the main brake is released, it is determined whether the parking brake has exceeded the reference temperature (steps S3-1 to N). In the illustrated example, the number of parking brakes is N, and if even one is YES, that is, if the reference temperature is exceeded, an alarm flag is set as described later. If all of steps S3-1 to S-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 S4). If YES, that is, if the alarm flag is set, the alarm flag is cleared (step S5), the alarm signal is stopped (step S6), and the operation of the alarm is stopped (step S7). , And returns to step S1. On the other hand, as described above, if any of the steps S3-1 to N 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. It outputs (step S9), activates the alarm (step S10), forcibly releases the parking brake (step S11), clears the timeout counter (step S12), and determines whether the confirmation switch is pressed. It is judged (step S13). If NO, that is, if the confirmation switch is not pressed, the timeout counter is incremented by 1 (step S14), and it is determined whether the time has reached the upper limit value (step S15). If YES, that is, If it has timed out, the process returns to step S1 again, and if NO, that is, if the time has not reached the upper limit value, 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 S18). ), And the timer operates (step S19). After this timer operates for a fixed time of 1 to 2 seconds, the timer stops and the process returns to step S1.

[0014]

[Effect of device]

 Since the present invention is configured as described above, when the temperature of the parking brake exceeds the reference value while driving, the parking brake is automatically released to prevent a runaway accident due to overheating of the brake, and the driver For example, a warning that the driver has forgotten to release the brake can be alerted to a malfunction.

[Brief description of 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]

 1 ... Parking brake 2 ... Drum 3 ... Lining 4 ... Shoe 5 ... Temperature sensor 6 ... Arm 7 ... Link 8 ... Parking brake lever 9 ... Spindle 10 ... Hand 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 indicator 21 ・ ・ ・ Alarm buzzer 22 ・ ・ ・ Alarm speaker 23 ・ ・ ・ Confirmation switch

Claims (1)

[Scope of utility model registration request] 1. A parking brake release device including a lock device for locking a parking brake lever in a parking brake operating state, a parking brake forced release actuator for releasing the lock device, and a temperature sensor for measuring a temperature of the parking brake. A vehicle speed sensor that measures the vehicle speed of the vehicle,
When the vehicle speed is above a certain speed and the temperature of the parking brake is above a certain temperature, a control device that outputs a signal to the parking brake forgetting alarm device and operates the parking brake forced release actuator, and forgets to release the parking brake A parking brake releasing device, comprising: a confirmation switch for releasing an output from a control device to an alarm device.