JP3875607B2 - Parking brake alarm device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a parking brake alarm device in which, when a vehicle travels while a parking brake is operated, a control unit operates an alarm unit to issue an alarm to a driver.
[0002]
[Prior art]
If the vehicle is run without noticing that the parking brake is operating, the friction material of the parking brake is worn or overheated, resulting in a problem that durability is lowered. Therefore, conventionally, there has been proposed an apparatus that issues a warning to the driver to prompt the driver to release the parking brake when the vehicle speed exceeds a predetermined value during operation of the parking brake (see Patent Document 1 and Patent Document 2).
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 38-14714 [0004]
[Patent Document 2]
Japanese Utility Model Publication No. 58-12057
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional one, when the driver's foot touches the parking brake pedal while the vehicle is running, an alarm is issued even if the parking brake switch is turned on for a moment, so the driver may feel troublesome. .
[0006]
The present invention has been made in view of the above-described circumstances, and an object thereof is to prevent a parking brake alarm device from operating unnecessarily and generating a useless alarm.
[0007]
[Means for Solving the Problems]
To achieve the above object, a first aspect of the invention, when the vehicle while it is operating the parking car brake has traveled, in the parking brake warning device the control means alert the driver to operate the alarm means, The control means activates the alarm means when the operation time of the parking brake exceeds a specified time at a vehicle speed higher than the specified vehicle speed, and the specified time decreases as the vehicle speed increases until the vehicle speed reaches a threshold value. And when it exceeds the said threshold value, it is hold | maintained for a fixed time.
[0008]
According to the configuration of claim 1, the control means activates the alarm means when the operation time of the parking brake exceeds the prescribed time at a vehicle speed higher than the prescribed vehicle speed, so be careful of the driver so that the vehicle does not travel while dragging the parking brake. To prevent the parking brake from deteriorating, and to prevent unnecessary warnings from being triggered when the parking brake is momentarily activated by touching the parking brake pedal. it can.
[0009]
Since until the car speed especially reaches the threshold decreases the predetermined time in accordance with the increase of the vehicle speed, the parking brake is accidentally operated alerts the early driver high speed drive that effects on the durability increases And promptly release the parking brake.
[0010]
The CPU 12 of the embodiment corresponds to the control means of the present invention, and the buzzer 13 of the embodiment corresponds to the alarm means of the present invention.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.
[0012]
1 to 5 show an embodiment of the present invention, FIG. 1 is a system configuration diagram of a parking brake alarm device, and FIG. 2 shows an operation of an alarm means when a parking brake is applied at a vehicle speed exceeding a specified value. FIG. 3 is a graph showing the relationship of the specified time to the vehicle speed, FIG. 4 is a graph showing the relationship of the alarm sound frequency, time interval and volume to the vehicle speed, and FIG. 5 is a case where the vehicle is started with the parking brake applied. It is a time chart explaining the action | operation of the warning means.
[0013]
As shown in FIG. 1, the parking brake alarm device 11 includes a central processing unit 12 (hereinafter referred to as CPU 12) as a control means and a buzzer 13 as an alarm means. The CPU 12 includes a vehicle speed sensor 14 that outputs a vehicle speed signal VSP, and a parking brake switch 15 that outputs an ON signal when the parking brake pedal is in the brake operating position and outputs an OFF signal when the parking brake pedal is in the brake released position. Based on these signals, the CPU 12 outputs a buzzer operation signal BUZ for controlling the operation of the buzzer 13.
[0014]
The parking brake is originally activated when the vehicle is stopped. However, if the parking brake is accidentally activated while the vehicle is running, the durability of the parking brake may be reduced due to frictional material wear or heat generated by dragging the parking brake. As problems arise, it is necessary to alert the driver to release the parking brake.
[0015]
Therefore, as shown in FIG. 2, when the driver depresses the parking brake pedal while the vehicle speed VSP gradually increases from 0 as the vehicle starts and reaches or exceeds a preset specified vehicle speed (7 km / h in the embodiment), The output of the brake switch 15 is turned on from off. When this state continues for a specified time (1 second in the embodiment) or longer, the CPU 12 intermittently turns on the buzzer operation signal BUZ to operate the buzzer 13 and warns the driver that the parking brake has been operated. When the driver who notices that releases the parking brake, the buzzer operation signal BUZ is turned off at that time, and the operation of the buzzer 13 is stopped.
[0016]
As described above, the buzzer 13 issues a warning when the parking brake is operated for a specified time or more when the vehicle speed VSP is equal to or higher than the specified vehicle speed. Can be prevented. In particular, even if the output of the parking brake switch 15 is turned on, the buzzer 13 does not issue an alarm if the specified time has not passed. Therefore, the output of the parking brake switch 15 is instantaneously turned on when the driver's foot touches the parking brake pedal. In such a case, it is possible to prevent an unnecessary alarm from being issued.
[0017]
As shown in FIG. 3, the specified time is set so as to decrease as the vehicle speed VSP increases. Specifically, the vehicle speed VSP linearly decreases from 1 second to 0.5 seconds from 7 km / h to a threshold value (40 km / h in the embodiment), and is maintained at 0.5 seconds when the vehicle speed VSP exceeds the threshold value. It has come to be. The higher the vehicle is traveling at a higher speed, the greater the impact on durability when the parking brake is activated. However, by reducing the specified time as the vehicle speed VSP increases, a warning is given to the driver earlier. To promptly release the parking brake.
[0018]
As the vehicle speed VSP increases, the alarm sound frequency of the buzzer 13 is increased as shown in FIG. 4A, and the intermittent alarm sound time interval of the buzzer 13 is shown in FIG. 4B. By shortening or increasing the volume of the alarm sound of the buzzer 13 as shown in FIG. 4C, it is possible to more effectively give the driver an alarm and promptly release the parking brake.
[0019]
FIG. 5 shows a case where the driver starts the vehicle without forgetting to release the parking brake. The vehicle speed VSP exceeds the specified vehicle speed (7 km / h in the embodiment), and then the specified time (1 second in the embodiment). After the elapse of time, the buzzer 13 is activated, and when the driver who notices it releases the parking brake, the operation of the buzzer 13 stops. Also in this case, it is possible to reliably prevent the parking brake from being dragged and to prevent the friction material from being worn out and the durability from being lowered due to heat generation.
[0020]
As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.
[0021]
For example, in the embodiment, the specified vehicle speed is set to 7 km / h and the specified time is set to 1 second, but the values can be changed as appropriate.
[0022]
The alarm means is not limited to the buzzer of the embodiment, and may be other acoustic means such as a chime or a speaker, or a light emitting means such as a lamp or LED.
[0023]
【The invention's effect】
As described above, according to the present invention, the control means activates the alarm means when the operation time of the parking brake exceeds the prescribed time at a vehicle speed equal to or higher than the prescribed vehicle speed, so that the driver does not travel while dragging the parking brake. It is possible to prevent a decrease in the durability of the parking brake by calling attention, and to prevent an unnecessary alarm from being issued when the parking brake is momentarily activated by touching the parking brake pedal. Can do.
[0024]
Since until the car speed especially reaches the threshold decreases the predetermined time in accordance with the increase of the vehicle speed, the parking brake is accidentally operated alerts the early driver high speed drive that effects on the durability increases And promptly release the parking brake.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of a parking brake alarm device. FIG. 2 is a time chart for explaining the operation of alarm means when a parking brake is applied at a vehicle speed higher than a specified value. FIG. 3 shows a relationship between a vehicle speed and a specified time. Graph [Fig. 4] Graph showing relationship between alarm sound frequency, time interval and volume with respect to vehicle speed [Fig. 5] Time chart explaining operation of alarm means when starting with parking brake applied [Explanation of symbols]
12 CPU (control means)
13 Buzzer (alarm means)
VSP vehicle speed

Claims (1)

In the parking brake alarm device in which the control means (12) operates the alarm means (13) to issue an alarm to the driver when the vehicle travels with the parking brake being operated.
The control means (12) activates the alarm means (13) when the operating time of the parking brake exceeds a specified time at a vehicle speed (VSP) equal to or higher than the specified vehicle speed, and the vehicle speed (VSP) is a threshold value for the specified time. The parking brake alarm device decreases until the vehicle speed (VSP) increases until the vehicle reaches the threshold value, and is maintained for a predetermined time when the threshold value is exceeded .

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