KR100231574B1 - Electro-magnetic brake apparatus and controlling method for a vehicle - Google Patents

Abstract

The present invention relates to an electronic brake device for a vehicle, comprising: a BPD (Brake Pedal Depth) sensor for converting and outputting the electric signal according to the operated angle of the brake pedal; A wheel sensor which senses the speed of the wheel and converts it into a constant electrical signal; A body speed sensor for detecting a speed of the vehicle body and converting the vehicle body into a constant electrical signal and outputting the same; An electronic control device connected to an output terminal of the three sensors and outputting a predetermined electrical signal by performing various operations, memories, and control processes; ABS input is connected to the output terminal of the electronic control device and the ABS actuator is operated by varying the torque to friction the brake shoe inside the brake drum, eliminating the existing complicated hydraulic circuit and adopting a simplified electronic circuit, ABS of the car The electronic brake device of a vehicle that can realize the and the control method.

Description

Electronic brake system of vehicle and its control method

The present invention relates to an electronic brake apparatus of a vehicle and a control method thereof, and more specifically, to an electronic brake apparatus of a vehicle capable of realizing ABS of a vehicle by removing a complicated hydraulic circuit and adopting a simplified electronic circuit. The control method is related.

As the vehicle's high performance increases, it is urgently required to secure a strong and stable brake performance and to stop the vehicle with sufficient braking force and stability under any conditions.

The braking force for stopping the vehicle can be obtained by the friction force generated between the tire and the road surface. The magnitude of the friction force varies greatly depending on the condition of the road surface and the type of tire.

In other words, if a sudden brake is operated on snowy roads or asphalt roads wet with rain, even if the wheels are locked and steered, the vehicle does not proceed in the intended direction and the braking stop distance is long, which is dangerous.

ABS has been developed for a long time in order to brake and stop at the optimum distance irrespective of such road conditions, and the configuration of the brake device of a vehicle using the conventional hydraulic pressure is shown in FIG.

As shown in the figure, the configuration of a brake device of a conventional vehicle includes a brake switch 10 'that detects whether a brake pedal is operated and converts it into a constant electrical signal, and detects the speed of the vehicle wheel and converts it into a constant electrical signal. And a wheel speed sensor 20 'for outputting the vehicle body, a vehicle speed sensor 30' for detecting a vehicle body speed of the vehicle and converting the vehicle body into a constant electric signal, and outputting the brake switch 10 'and the wheel speed sensor 20. '), An output terminal of the vehicle body speed sensor 30' is connected to an input terminal, an electronic control unit (40; Electronic Control Unit) for outputting a predetermined electrical signal, arithmetic, storage and control processing, and the electronic control device (40 ') ) Is composed of an ABS actuator 60 'which is connected to the input terminal and brakes the vehicle. Here, the ABS actuator 60 'is a hydraulic pressure of the wheel cylinder 70' which causes the master cylinder 50 'to generate the hydraulic pressure according to the operation of the brake pedal and the brake shoe (not shown) in the brake drum. It is a kind of electromagnetic solenoid valve located between the lines to control the braking force by performing hydraulic pressure reducing, pressure increasing and holding modes.

The operation and control method of a brake device of a conventional vehicle having such a configuration will be described below with reference to the ABS actuator.

When the driver operates the brake pedal for the first time, the electronic control device 40 'detects this with the brake switch 10' and then uses the wheel speed sensor 20 'and the body speed sensor 30' to determine the wheel speed and After detecting the vehicle speed, the ABS actuator 60 'is controlled in four modes as follows.

First, the normal brake action, which is when the driver firstly brakes the vehicle by operating the brake pedal, the solenoid of the ABS actuator 60 'enters the pressurized mode, thereby maintaining the hydraulic pressure of the master cylinder 50' as it is. 70 ') and release of the brake pedal causes the brake oil of the wheel cylinder 70' to return back to the master cylinder 50 '.

The second is the decompression mode. When the wheels are locked as a result of analyzing the signals from the wheel speed sensor 20 'and the body speed sensor 30', the electronic control device 40 'is a solenoid which is an ABS actuator 60'. Set the pressure reduction mode to separate the oil pressure of the wheel cylinder 70 'and return the generated oil pressure to the master cylinder 50' side.

The third is a maintenance mode in which the hydraulic pressure of the wheel cylinder 70 'is maintained as it is, and the electronic control device 40' detects the signals of the wheel speed sensor 20 'and the body speed sensor 30' and then Determine whether to control this.

Fourth, when the rotation of the wheel is restored and it is necessary to restore the braking force, the current is flowed again to the solenoid of the ABS actuator (60 '), and the master cylinder (50') to the wheel cylinder (60 ') as in the case of a normal brake. To deliver hydraulic pressure.

However, the brake device of the conventional vehicle and its control method are all combined with a hydraulic circuit and an electronic circuit in which a master cylinder, an ABS actuator, and a wheel cylinder mechanically connected to the brake pedal are complicated and bulky, so that failure occurs easily. There is a concern that the price is high and the price is high.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. The present invention provides an electronic brake apparatus for a vehicle and a control method thereof capable of realizing ABS of a vehicle by removing an existing complicated hydraulic circuit and adopting a simplified electronic circuit. To provide.

1 is a block diagram showing a configuration of a conventional general hydraulic brake device.

2 is a block diagram showing the configuration of an electronic brake device for a vehicle according to the present invention.

3 is a flowchart illustrating a control method of an electronic brake apparatus for a vehicle according to the present invention.

4 is a graph comparing a change in torque amount of a motor, which is a component of an electronic brake apparatus of an automobile, and a deceleration of an actual wheel.

* Explanation of symbols for main parts of the drawings

10: BPD (Brake Pedal Depth) Sensor 20: Wheel Speed Sensor

30: body speed sensor 40: signal conversion unit

41: preamplifier 42: analog / digital converter

50: electronic control device 60: signal conversion unit

61: digital / analog converter 62: amplifier

70: ABS (Anti-lock Brake System) Actuator

In order to achieve the above object, the electronic brake apparatus of an automobile according to the present invention includes: a BPD (Brake Pedal Depth) sensor for converting and outputting a predetermined electric signal according to the operated angle of the brake pedal; A wheel speed sensor for detecting a speed of the wheel and converting the wheel into a constant electric signal; A body speed sensor for detecting a speed of the vehicle body and converting the vehicle body into a constant electrical signal and outputting the same; An electronic control device which receives an output signal of the three sensors and outputs a predetermined electrical signal by performing various calculations, memories and control processes; And an ABS actuator configured to receive the output signal of the electronic control device so that the brake shoe inside the brake drum is operated by the torque of the motor.

In addition, to achieve the above object, the electronic brake device control method of a vehicle according to the present invention comprises the steps of: initializing all memory variables when power is applied and operation starts; Detecting whether the brake pedal is operated using the BPD sensor, and detecting the deceleration of the wheel and the deceleration of the vehicle body using the wheel speed sensor and the body speed sensor; Calculating the torque of the ABS actuator according to the wheel deceleration estimate calculated from the BPD sensor and the body speed sensor to operate the ABS actuator; Determining whether the deceleration output from the wheel speed sensor and the vehicle body speed sensor are the same; If the wheel deceleration and the vehicle deceleration are the same, operating the ABS actuator with the calculated torque value of the ABS actuator; and if the wheel deceleration and the body deceleration are different, determining whether the body deceleration is greater than the wheel deceleration; Operating the ABS actuator by increasing the torque of the ABS actuator if the vehicle body deceleration is greater than the wheel deceleration as a result of the determination; And if the vehicle body deceleration is smaller than the wheel deceleration as a result of the determination, operating the ABS actuator by reducing the torque of the ABS actuator.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, an electronic brake apparatus and a control method of an automobile according to the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. same.

2 is a block diagram showing the configuration of an electronic brake device for a vehicle according to the present invention.

As shown in the configuration of the electronic brake apparatus of an automobile according to the present invention, the BPD sensor 10 to install a variable resistor on one side of the brake pedal to output different voltage values according to the operating angle of the brake pedal, An electronic pickup sensor installed in the wheel, which detects the speed of the wheel and converts it into a constant electrical signal, and outputs the wheel speed sensor 20, and as a taco meta, detects the speed of the vehicle body and converts it into a constant electrical signal and outputs it. Each sensor 30 is provided.

The input terminal of the signal converter 40, which is composed of a preamplifier 41 and an analog / digital converter 42, is connected to each sensor output terminal to amplify the sensor signal to a predetermined level, and the computer amplifies the amplified signal. It can be converted into a digital signal that can be handled and output.

An output terminal of the electronic control apparatus 50 is connected to an output terminal of the signal conversion unit 40, which receives the three amplified and digitized sensor signals and performs various calculation, storage, comparison and control processes, and a predetermined result value. Is converted into an electrical signal and output to the next stage. Here, the electronic control device 50 calculates, stores, and compares signals of a sensor that is loaded by loading a program, a reference value, etc., a memory that stores a predetermined program and various reference values for operating the electronic brake device. The predetermined computer which assumed the central processing unit to control-process.

On the other hand, a signal conversion unit 60 composed of a digital / analog converter 61 and an amplifier 62 is connected to an output terminal of the electronic control device 50 to amplify a signal from the electronic control device 50, and also to provide analog electrical power. It is configured to output as a signal.

In addition, an input end of the ABS actuator 70 is connected to the output end of the signal converter so that the ABS actuator 70 operates as a predetermined torque, which causes the rotation shaft of the motor (not shown) to be brake shoe (not shown) in the brake drum. Mechanically installed so that different frictions can occur depending on the torque of the motor.

3 shows a control method and an operation of an electronic brake apparatus for a vehicle according to the present invention having such a configuration.

As shown, the control method and operation of the electronic brake device of the vehicle according to the present invention, when the power is first applied, the electronic control device 50 initializes all the memory variables and load a predetermined program from the memory ready to operate Then, the electronic brake system is controlled by the following control sequence.

First, the manipulated degree of the brake pedal is sensed using the BPD sensor 10, and the deceleration of the wheel and the deceleration of the body are sensed using the wheel speed sensor 20 and the body speed sensor 30.

Subsequently, the ABS actuator 70 is operated by calculating the torque of the ABS actuator 70 according to the value output from the BPD sensor 10, that is, the degree of the brake pedal.

Here, the known degree of the brake pedal and the torque value to be operated of the ABS actuator 70 are already stored in the memory as a reference value, and the electronic controller 50 matches the reference value with the known degree of the brake pedal to match the ABS actuator 70. To work.

Next, it is determined whether the wheel deceleration and the body deceleration are the same according to the values output from the wheel speed sensor 20 and the body speed sensor 30. If the wheel deceleration and the body deceleration are the same, the wheel is not locked. Since the ABS actuator 70 is continuously operated with the calculated torque value of the ABS actuator 70, if the wheel deceleration and the body deceleration are different, it is determined whether the body deceleration is greater than the wheel deceleration.

As a result of the determination, when the body deceleration is greater than the wheel deceleration, the torque of the ABS actuator 70 is increased to operate the ABS actuator 70. When the determination result is that the body deceleration is smaller than the wheel deceleration, that is, the wheel is to be locked. Lowering the torque of the ABS actuator 70 to operate the ABS actuator 70 so that the wheel does not lock.

Here, the relationship between the torque amount of the motor which is the operating value of the ABS actuator 70, the actual deceleration of the wheel, and the expected wheel deceleration estimate is shown in FIG.

In the graph, the x-axis is the time, the y-axis is the expected wheel deceleration, the actual wheel deceleration, and the torque amount of the motor applied to the motor of the ABS actuator 70. As shown in the figure, when the driver wants to stop the vehicle by operating the brake pedal, the deceleration estimate of the wheel previously stored in the memory is called as a function corresponding to the vehicle speed described above. The deceleration is compared.

As a result of comparing the deceleration estimate of the wheel and the deceleration of the actual wheel, when the deceleration of the actual wheel is greater than the expected deceleration of the wheel, that is, in the S1 section of the graph, the motor torque is intermittently allowed by ΔT. By reducing the torque, the locking of the wheel is prevented and when the expected wheel deceleration is greater than the actual deceleration (S2 section), the torque is increased by reducing ΔT. In addition, if the actual deceleration of the wheel is similar to the expected deceleration of the wheel (S3 section), constant torque is continuously provided so that the vehicle can be braked without slipping and cornering.

As described above, although the present invention has been described with reference to the above embodiments, various embodiments are possible by those skilled in the art without departing from the scope and spirit of the present invention.

Therefore, the electronic brake apparatus of the automobile and the control method thereof according to the present invention provide an electronic brake apparatus and a control method of the automobile which can realize the ABS of the automobile by removing the existing complicated hydraulic circuit and adopting a simplified electronic circuit. It is.

Claims (2)

A BPD (Brake Pedal Depth) sensor which converts the brake pedal into a predetermined electrical signal and outputs the same according to the manipulated angle of the brake pedal; A wheel speed sensor for detecting a speed of the wheel and converting the wheel into a constant electric signal; A body speed sensor for detecting a speed of the vehicle body and changing and outputting the vehicle body as a constant electrical signal; An electronic control device which receives output signals of the BPD sensor, the wheel speed sensor, and the vehicle body speed sensor, and outputs a predetermined electrical signal by performing various calculations, memories, and control processes; The rotating shaft of the motor is engaged with the brake shoe so as to push the brake shoe inside the brake drum, and an ABS actuator configured to receive the output signal of the electronic control device and operate the brake shoe by the torque of the motor. Features electronic brake device. Initializing all memory variables when power is supplied and operation starts; Detecting whether the brake pedal is operated using the BPD sensor, and detecting the wheel deceleration and the deceleration of the vehicle body using the wheel speed sensor and the body speed sensor; Calculating the torque of the ABS actuator according to the wheel deceleration estimate calculated from the BPD sensor and the body speed sensor to operate the ABS actuator; Determining whether the deceleration output from the wheel speed sensor and the vehicle body speed sensor are the same; If the wheel deceleration is equal to the body deceleration, the ABS actuator is operated with the calculated torque value of the ABS actuator; and if the wheel deceleration and the body deceleration are different, determining whether the body deceleration is greater than the wheel deceleration; Operating the ABS actuator by increasing the torque of the ABS actuator if the vehicle body deceleration is greater than the wheel deceleration as a result of the determination; And if the vehicle body deceleration is less than the wheel deceleration as a result of the determination, operating the ABS actuator by reducing the torque of the ABS actuator.

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