JPH0848237A - Parking brake alarm device - Google Patents

Abstract

PURPOSE:To provide a device which provides an operator an alarm so as to operate surely the brake force of a parking brake. CONSTITUTION:This is a parking brake alarm device provided with a parking brake sensor 3 to output a signal in the case of the brake force of a parking brake being less than a set value; a door sensor 5 to output a signal in the case of an operation seat door being opened; a first logic circuit 10 to input the outputs of the parking brake sensor 3 and the door sensor 5; and an alarm means 9 that is operated by output from the first logic circuit 10 and issues an alarm to an operator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm device for a vehicle parking brake.

[0002]

2. Description of the Related Art Conventionally, there is a device disclosed in Japanese Utility Model Publication No. 55-19726, which is a device for reliably operating a parking brake when a driver gets off a vehicle.

In the parking brake forgetting prevention device disclosed in Japanese Utility Model Publication No. 55-19726, a parking switch is connected in series to a buzzer circuit, and a room lamp circuit operated by a door switch is connected thereto via a relay. It has been combined so that if you forget to apply the parking brake and open the door, an alarm will be issued.

[0004]

However, the parking switch mounted on a normal vehicle has a parking switch that operates even if the parking brake does not operate sufficiently and the braking force is low (just pulling the parking lever a little). A signal indicating that the parking brake has been activated is output. Therefore, in the parking brake forgetting prevention device of Japanese Utility Model Publication No. 55-19726, which uses such a parking switch, when the braking force of the parking brake is low, an alarm is issued even if the driver opens the door. There was a problem with the alarm function.

The present invention has been made in view of the above matters, and it is a technical object to provide a device for reliably operating the braking force of a parking brake. Further, it is a technical object to provide a device that issues an alarm when the driver attempts to get off the vehicle when the parking brake is not applied or the braking force of the parking brake is insufficient.

Another object of the present invention is to provide a device for issuing an alarm when the vehicle starts to move when the parking brake has a weak braking force.

[0007]

In order to solve the above technical problems, the present invention has the following constitution. That is, a parking brake sensor that outputs a signal when the braking force of the parking brake is less than or equal to a set value, a door sensor that outputs a signal when the door of the driver's seat is opened, and the outputs of the parking brake sensor and the door sensor are input. And a warning device that is activated by the output from the first logic circuit and that issues a warning to the driver.

Further, there is provided a vehicle movement detecting means for detecting the movement of the vehicle, and a second logic circuit for receiving the respective outputs from the parking brake sensor and outputting an operation signal to the alarm device. Good. Here, the first logic circuit and the second logic circuit can be configured by AND circuits.

Depending on the output level from each sensor, each sensor may be connected to the AND circuit via an inverter, or another logic circuit may be used. Further, the parking brake sensor and the door sensor may be connected in series, and the alarm device may be connected at the subsequent stage. Similarly, the parking break sensor and the vehicle movement detecting means may be connected in series, and the alarm device may be connected at the subsequent stage.

Further, the parking brake is provided with a control unit (ECU) including a central processing unit (CPU), a read / write memory (RAM), a read only memory (ROM) and an input / output device (I / O). Each of the sensor, the door sensor, the vehicle movement detecting means, and the alarm device may be connected to the input / output device. In this case, the control unit, the parking brake force is less than or equal to the set value by the signal from the parking brake sensor,
In addition, an operation signal is output to the alarm device when it is determined that the door is opened by the signal from the door sensor. Further, the control unit outputs an operation signal to the alarm device when it determines that the parking brake force is less than or equal to a set value based on a signal from the parking brake sensor and the vehicle has started to move based on a signal from the vehicle movement detection means. To configure. In addition, the control unit is a logic IC.
You may comprise as a logic circuit by etc.

The parking brake sensor may be a pulling force sensor for detecting a pulling force of a wire connecting the parking lever of the parking brake and the brake operating portion, or a stroke sensor for detecting a stroke of the wire.

The pulling force sensor may be, for example, a resistance wire strain gauge, a piezoelectric element, a pressure switch or the like. Further, the stroke sensor can be exemplified by a differential transformation type stroke sensor or a sensor that detects the amount of movement of the parking lever.

The attractive force sensor may output a high level when the attractive force value is less than or equal to the first set value and greater than or equal to the second set value. That is, the pulling force sensor in this case does not output when the braking force of the parking brake is sufficient and when the parking brake is not operating.

For example, a wheel speed sensor can be used as the vehicle movement detecting means. This wheel speed sensor can be exemplified by an electromagnetic pickup type speed sensor.

The door sensor can be exemplified by a door switch which detects opening / closing of a door panel. The alarm device can be exemplified by a device that gives an alarm to a driver by visual display or audio display.

[0016]

When the detection value of the parking brake sensor is equal to or less than the set value and the door of the driver's seat is opened, all the inputs of the first logic circuit become high level and the output of the first logic circuit becomes high level. . Therefore, the alarm device is activated to make the driver aware that the braking force of the parking brake is insufficient.

When the vehicle movement detecting means is provided, when the detected value of the parking brake sensor is less than or equal to the set value and the vehicle moves, all the inputs of the second logic circuit become high level, and the output of the second logic circuit becomes High level. Therefore, the alarm device is activated to make the driver aware that the vehicle has started to move while the parking brake is still weakly applied.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The parking brake warning device of this embodiment is
Parking pull force switch (parking brake sensor) 3, door switch (door sensor) and 5, alarm device 9, wheel speed sensor (vehicle movement detection means) 6, and first
An AND circuit 10 and a second AND circuit 11 are provided.

The parking pulling force switch 3 is for detecting the braking force of the parking brake, and is composed of a pulling force sensor for detecting the pulling force of the wire connecting the parking lever and the brake operating portion. The output of the parking pulling force switch 3 becomes a high level when the pulling force value is equal to or less than a preset threshold value. That is, the parking pulling force switch 3 does not output a high level when the parking brake generates a sufficient braking force, but outputs a high level when the braking force is weak.

The door switch 5 detects opening / closing of the door panel, and when the door panel is opened, the output becomes high level. The wheel speed sensor 6 outputs a high level when the wheels rotate, that is, when the vehicle starts moving. The outputs of the parking pull force sensor 3 and the door switch 5 are connected to a two-input type first AND circuit 10.

On the other hand, the outputs of the parking pulling force sensor 3 and the wheel speed sensor 6 are two-input type second AND circuit 11
Is input to The outputs of the first AND circuit 10 and the second AND circuit 11 are input to the alarm device 9. The warning device 9 gives a warning to the driver by visual display such as a lamp and voice display by a buzzer sound.

Next, the operation of this embodiment will be described. When the driver pulls the parking lever and the pulling force is equal to or less than the set value, the output level of the parking pulling force switch 3 becomes high level. When the door panel of the vehicle (for example, the door panel of the driver's seat) is opened, the output of the door switch 5 becomes high level. Therefore, the first AND circuit 1
Since both of the inputs of 0 become high level, the output of the first AND circuit 10 becomes high level and the alarm device 9 operates. That is, when the door is opened while the parking brake has a weak braking force, the alarm device 9 is activated to give an alarm to the driver.

The high level output of the parking pulling force switch 3 is also input to the second AND circuit 11. Then, when the wheels start moving and the output of the wheel speed sensor 6 becomes high level, all the inputs of the second AND circuit 11 (both of them) become high level, and the alarm device 9 is activated. That is, when the vehicle starts to move with the parking brake having a weak braking force, the alarm device 9 is activated.

As described above, according to this embodiment, when the driver tries to get off the vehicle, the driver is warned that the parking brake should be operated so as to have a sufficient braking force. Therefore, it is possible to prevent the vehicle stopped due to insufficient braking force from starting to move due to new loading.

Also, when the vehicle starts to move when the parking brake has a weak braking force, a warning is given to the driver. Therefore, it is possible to prevent the vehicle from traveling in such a light brake drag state that the driver does not notice.

The parking brake warning device of this embodiment is a normal parking switch 2 as shown in FIG.
May be included. In this case, when the parking lever is pulled, the output of the parking switch 2 becomes high level. Then, the first AND circuit 10 becomes a 3-input type,
When all the outputs of the parking switch 2, the parking pulling force switch 3 and the door switch 5 become high level, the alarm device 9 is activated. Further, the parking indicator lamp 8 is activated by the high level output from the parking switch 2.

[0027]

According to the present invention, it is possible to provide a device for reliably operating the braking force of the parking brake.

Further, it is possible to provide a device which gives an alarm when the driver tries to get off the vehicle when the parking brake is not applied or the braking force of the parking brake is insufficient.

Further, it is possible to provide a device for issuing an alarm to the driver when the vehicle starts to move in a state where the braking force of the parking brake is weak.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing another aspect of the embodiment.

[Explanation of symbols]

3 ... Parking pull force switch (parking brake sensor) 5 ... Door switch (door sensor) 6 ... Wheel speed sensor (vehicle movement detection means) 8 ... Parking indicator light 9 ... Alarm device 10 ... First logic circuit (First AND circuit) 11. Second logic circuit (second AND circuit)

Claims (3)

[Claims] 1. A parking brake sensor that outputs a signal when the braking force of the parking brake is equal to or less than a set value, a door sensor that outputs a signal when the door of the driver's seat is opened, and the parking brake sensor and the door sensor. A parking brake alarm device comprising: a first logic circuit having an output as an input; and an alarm device which is activated by an output from the first logic circuit and which issues an alarm to a driver. 2. A vehicle movement detecting means for detecting movement of the vehicle, and a second logic circuit for receiving an output of each of the parking brake sensors and outputting an operation signal to the alarm device. The parking brake warning device according to claim 1. 3. The parking brake sensor is a pulling force sensor for detecting a pulling force of a wire connecting a parking lever of a parking brake and a brake operating portion, or a stroke sensor for detecting a stroke of the wire. The parking brake warning device according to claim 1 or 2.