KR19980047670A - Parking brake safety system and control method - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking brake safety system and a control method thereof, and more particularly to a parking brake safety system capable of preventing damage to a brake device due to the start of a vehicle in a locked state of a parking brake and a safety accident caused by incomplete locking of the parking brake. And a control method thereof.

The present invention provides a vehicle speed sensor for generating a vehicle speed signal, a taco sensor for generating an engine speed signal, a driver riding detection sensor installed in a driver seat to generate a driver seating signal, and an on state according to the operation of the parking brake. A parking brake switch that is set, an actuator installed in the parking brake for forcibly locking or unlocking the brake, and when the driver seating signal is received, the parking brake switch is on and the vehicle brake is zero or more. Is set to the locked state and generates a warning signal.If the driver's seat signal is not received, the control means for setting the parking brake to the unlocked state and generating a warning signal when the parking brake switch is on and the vehicle speed and RPM are more than zero. Characterized in that consists of.

Description

Parking brake safety system and control method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking brake safety system and a control method thereof, and more particularly to a parking brake safety system capable of preventing damage to the brake device due to the start of a vehicle in a safety accident caused by incomplete locking of the parking brake and a locking state of the parking brake. And a control method thereof.

In general, the basic circuit of a vehicle brake consists of a brake pedal, booster, master cylinder, brake pipe, wheel cylinder and wheel brake.

Also, wheel brakes of passenger cars generally use disc brakes for the front axle and drum brakes or disc brakes for the rear axle. In contrast, most trucks use drum brakes on all wheels.

In the above structure, the hydraulic brake is transmitted to the brake oil in the master cylinder via the piston of the master cylinder as the brake pedal is pressed, and the pressure of the brake oil is passed through each brake pipe according to Pascal's principle. Is delivered to the piston. The pressure of the piston is then converted into a compressive force acting on the brake pads and braking is achieved by the brake pads pressing the disks tightly.

On the other hand, the parking brake serves to keep the parking or stopped state or to prevent the vehicle parked or stopped on the hill by itself, and serves as an auxiliary brake even when the main brake cannot function properly.

Such parking brakes include a center brake type for braking the brake drum provided on the propulsion shaft and a rear wheel brake type for braking the rear wheels.

The center brake parking brake is generally used in trucks or buses and is installed at the rear of the transmission, and the rear brake parking brake is widely used in passenger cars.

In addition, in the latter type of parking brake device, the parking cable is operated in accordance with the operation of lifting the parking lever upward to separate the brake shoes of the drum brake installed on the rear wheel from side to side and closely adhere to the drum (or the brake pad in the case of disc brake). Braking is achieved.

However, such a parking brake generates weak braking force by the brake device when the parking cable for transmitting the braking force is loosened, the brake lining is worn, excessive load is loaded, or the parking brake is incompletely locked (Locking) by the driver's mistake. There was a problem causing unwanted safety accidents or collisions as you move.

In addition, damage to the brakes often occurs to beginners by attempting to start the vehicle with the parking brake locked.

Accordingly, the present invention has been made in view of the problems of the prior art, the object of which is to prevent the damage of the brake device due to the safety of the parking brake brake due to the start of the vehicle in the locking state of the parking brake. The present invention provides a brake safety system and a control method thereof.

1 is a schematic block diagram of a parking brake safety system according to the present invention;

2 is a control flowchart of the parking brake safety system according to the present invention.

Explanation of symbols on the main parts of the drawings

One ; Vehicle speed sensor 3; Taco sensor

5; Driver's ride detection sensor; Parking brake switch

9; A / D converter 11; CPU

13; Motor driver 15; Actuator

17; Buzzer

In order to achieve the above object, the present invention provides a vehicle speed sensor for generating a vehicle speed signal, a taco sensor for generating a rotational speed signal of the engine, a driver riding sensor installed in the driver seat for generating a driver seating signal, and parking A parking brake switch that is set to on according to the operation of the brake, an actuator installed in the parking brake to forcibly lock or unlock the brake, and the parking brake switch is turned on when the driver's seat signal is received. When the parking brake is above zero, the parking brake is set to the locked state and a warning signal is generated. When the driver's seat signal is not received, the parking brake is turned on and the parking brake is set to the unlocked state when the vehicle speed and RPM are greater than zero. Characterized in that the control means for generating a warning signal Provides the parking brake safety system.

In addition, the parking brake safety control method of the present invention determines whether the driver is seated, and if the driver is not seated, the parking brake switch is turned on and when the vehicle speed is zero or more, the parking brake is set to the locked state and a warning signal is generated. And setting the parking brake to the unlocked state and generating a warning signal when the parking brake switch is on and the vehicle speed and RPM are zero or more when the driver is seated.

As described above, the present invention senses the driver's presence and detects the speed of the vehicle when there is no driver to force the vehicle to lock the parking brake, and when the driver is present, the vehicle moves in the parking brake state and the engine If the RPM is above zero, the parking brake is unlocked and at the same time a warning sound is output.

EXAMPLE

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a schematic block diagram of a parking brake safety system according to the present invention, and FIG. 2 is a control flowchart of the parking brake safety system according to the present invention.

First, referring to FIG. 1, in the present invention, a vehicle speed sensor 1 for generating a vehicle speed signal, a taco sensor 3 for generating a rotation speed signal of an engine, and a driver seat are installed in a driver seat to provide a driver's seating signal. A driver's ride detection sensor 5 that is generated and a parking brake switch 7 set in an on state in accordance with the operation of the parking brake are provided.

The vehicle speed sensor 1, the taco sensor 3, and the driver's ride detection sensor 5, through the analog / digital converter 9, temporarily store ROM having a system control program and data in process. It is connected to a microprocessor (CPU) 11 having a RAM, and the parking brake switch 7 is directly connected to the CPU 11.

In addition, an actuator 15 configured as a motor is connected to the output of the CPU 11 to lock or unlock the parking brake through the motor driver 13, and a buzzer 17 for generating a warning sound is directly connected to the output of the CPU 11. have.

The operation of the system of the present invention configured as described above will be described in detail with reference to FIG. 2.

First, the driver's seating signal generated by the piezoelectric method from the driver's riding sensor 5 is received by the CPU 11 through the A / D converter 9 to determine whether the driver is present (S1, S2).

If there is no driver as a result of the determination, it is determined whether the parking brake switch (S / W) 7 is on (S3). As a result of the determination, when the brake switch 7 is off, it is determined that the driver intentionally turns off the brake by, for example, in-line parking or the like, so that the actuator 15 is not operated.

However, when the parking brake switch S / W 7 is in the on state, the vehicle speed signal is received from the vehicle speed sensor 1 through the A / D converter 9 (S4).

Thereafter, the CPU 11 determines whether the vehicle speed is zero or more, that is, the vehicle starts to move (S5). If the vehicle speed is greater than or equal to zero as a result of the determination, the CPU 11 generates a drive signal to the motor driver 13 to forcely lock the parking brake by operating the actuator 15 (forward rotation) (S6). In addition, the CPU 11 generates a warning signal to the buzzer 17 to generate a warning sound by the buzzer 17 to prevent a safety accident due to the movement of the vehicle.

On the other hand, as a result of the determination (S2), if there is a driver, it is determined whether the parking brake switch 7 is in the on state (S8).

As a result of the determination, when the parking brake switch 7 is in the on state, the vehicle speed signal is received from the vehicle speed sensor 1 through the A / D converter 9 (S9).

Thereafter, the CPU 11 determines whether the vehicle speed is zero or more, that is, the vehicle starts to move (S10). As a result of the determination, when the vehicle speed is equal to or greater than zero, the CPU 11 receives an engine speed signal from the taco sensor 3 to obtain an RPM value by signal processing (S11), and then determines whether the RPM value is equal to or greater than zero (S11). S12).

If it is determined that the RPM value is equal to or greater than zero, it is determined that the driver attempts to drive while the parking brake is filled, and the CPU 11 outputs a reverse drive signal to the motor driver 13 to operate the actuator 15 (reverse rotation). The parking brake is released to an unlocked state (S13), and at the same time, a warning signal is generated to generate a warning sound by turning on the buzzer 17 (S14).

As described above, the present invention senses the driver's presence and detects the speed of the vehicle when there is no driver to force the vehicle to lock the parking brake, and when the driver is present, the vehicle moves in the parking brake state and the engine If the RPM is above zero, the parking brake is unlocked and at the same time a warning sound is output.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and is not limited to the spirit of the present invention. Various changes and modifications can be made by those who have

Claims (2)

A vehicle speed sensor for generating a vehicle speed signal, A taco sensor for generating an engine speed signal, A driver's ride sensor installed on the driver's seat to generate a driver's seating signal; A parking brake switch that is set to on according to the operation of the parking brake, An actuator installed in the parking brake for forcibly locking or unlocking the brake; When the driver's seating signal is received, the parking brake switch is on and when the vehicle speed is zero or more, the parking brake is set to the locked state and a warning signal is generated. When the driver's seating signal is not received, the parking brake switch is on. A parking brake safety system, comprising: a control means for setting the parking brake to an unlocked state and generating a warning signal when the vehicle speed and RPM are greater than or equal to zero. Determining whether the driver is seated; When the driver is not seated, setting the parking brake to the locked state and generating a warning signal when the parking brake switch is on and the vehicle speed is greater than zero; And when the driver is seated, setting the parking brake to the unlocked state and generating a warning signal when the parking brake switch is on and the vehicle speed and RPM are greater than or equal to zero.