CN202358078U - Electronic parking brake device based on single-chip microcomputer - Google Patents

Abstract

The utility model discloses an electronic parking brake device based on a single-chip microcomputer, which comprises a power supply, a sensor unit and a control unit, wherein the control unit and the sensor unit are respectively connected to the power supply, and the output end of the sensor unit is connected to the input end of the control unit to control The unit is connected to the motor. It also includes an emergency release brake button, which is respectively connected with the power supply and the control unit. The utility model uses the control of the single-chip microcomputer to replace the parking button of the traditional parking system, adds various sensors, completes the parking process and releases the parking through the processing of the single-chip microcomputer, and does not need the driver to actively operate the parking button, has high safety performance and is easy to use , fast response, accurate control and so on. Making the car more autonomous can effectively avoid the danger of not parking due to the driver's negligence.

Description

An electronic parking brake device based on single chip microcomputer

technical field

The utility model belongs to the field of intelligentization of electronic parking brake systems, in particular to an electronic parking brake device based on a single-chip microcomputer. the

Background technique

With the rapid development of single-chip microcomputer technology in recent years, the further development and improvement of active safety technology, coupled with the continuous production of new and more advanced manufacturing processes, the field of automotive safety has undergone earth-shaking changes. At the same time, the extensive application of electronic technology and information technology in automobiles, and the emergence of advanced technologies such as ABS, ASR, and EBD in the field of active safety technology have further promoted the development of automobile safety technology in the direction of automation and intelligence. In terms of active safety, the electronic parking brake system has emerged as the times require, using advanced electronic equipment to replace the existing human-mechanical parking brake system, and the driver can realize the parking brake function only by pressing a button. The driver provides better operating comfort and more safety. Although there are a wide variety of models with electronic parking brake systems on the market, such as Volkswagen Magotan, Audi A4, Audi A6, and New Regal, etc., most of them realize parking through manual operation buttons. , the driver forgets to press the parking button, the car is in a free state, and there is a potential safety hazard. Therefore, it is very necessary to design an electronic parking brake device capable of automatic parking. the

Contents of the invention

In view of the defects or deficiencies in the above-mentioned prior art, the purpose of this utility model is to provide an electronic parking brake device based on a single-chip microcomputer, which processes the information collected by the sensor unit through the single-chip microcomputer, and uses the processed braking signal Control the brake motor to achieve the purpose of automatic parking when the car is parked. The current situation of potential safety hazards existing in the existing electronic parking brake system is improved. the

In order to achieve the above object, the utility model adopts the following technical solutions to achieve:

An electronic parking brake device based on a single-chip microcomputer is characterized in that it includes a power supply, a sensor unit, and a control unit, wherein the control unit and the sensor unit are respectively connected to the power supply, the output end of the sensor unit is connected to the input end of the control unit, and the control unit Connect the motor. the

The utility model also includes the following other technical features:

It also includes an emergency release brake button, which is respectively connected with the power supply and the control unit. the

The emergency brake release button adopts the E538 button. the

The sensor unit includes a wheel speed sensor, a clutch position sensor, a gradient sensor, and a brake motor position sensor. the

The wheel speed sensor is a Hall effect wheel speed sensor. the

The clutch position sensor adopts G476;

The slope sensor adopts Finnish SCA61T;

The position sensor of the brake motor adopts an angular displacement sensor. the

The control unit adopts MC9S12XS128 single-chip microcomputer. the

The utility model uses the control of the single-chip microcomputer to replace the parking button of the traditional parking system, adds various sensors, completes the parking process and releases the parking through the processing of the single-chip microcomputer, and does not need the driver to actively operate the parking button, has high safety performance and is easy to use , fast response, accurate control and so on. Making the car more autonomous can effectively avoid the danger of not parking due to the driver's negligence. the

Description of drawings

Fig. 1 is the structural representation of the utility model. the

Fig. 2 is a working principle diagram of the utility model. the

Figure 3 is a schematic diagram of the pin wiring of the MC9S12XS128 microcontroller. the

The utility model will be further explained below in conjunction with the accompanying drawings and specific embodiments. the

Detailed ways

Referring to Fig. 1, the electronic parking brake device based on the single-chip microcomputer of the present invention comprises a power supply, a sensor unit, and a control unit, wherein the control unit and the sensor unit are respectively connected to the power supply, and the output end of the sensor unit is connected to the input end of the control unit, The control unit is connected to the motor. the

The sensor unit includes a wheel speed sensor, a clutch position sensor, a slope sensor, and a brake motor position sensor, which are respectively used to collect information such as vehicle speed, clutch position, slope, and brake motor position. The wheel speed sensor adopts Hall effect type wheel speed sensor, the clutch position sensor adopts G476; the slope sensor adopts Finnish SCA61T; the brake motor position sensor adopts angular displacement sensor. the

The power supply adopts the vehicle 12V power supply. the

The control unit adopts MC9S12XS128 single-chip microcomputer. the

In addition, the utility model also includes an emergency brake release button, which is respectively connected with the power supply and the control unit, and the emergency brake release button adopts the E538 button. the

In practice, the control unit is connected to the brake motor of the vehicle's brake mechanism. The wheel speed sensor is installed on the rear wheel, the clutch position sensor is installed at the bottom of the clutch pedal, the slope sensor is installed at the center of gravity of the car, and the motor position sensor is installed at the motor reset position. the

The control unit (ECU) is used to receive the information transmitted by the sensor unit in real time, and process the information, and judge whether parking is required according to the processing result. If parking is required, the single-chip microcomputer will control the brake motor through the motor drive circuit through the control signal. The brake motor controls the wheels of the vehicle through the brake mechanism to realize parking. When the car needs to release the brake, the single-chip microcomputer controls the driving motor through the motor drive circuit to release the braking force and restore the driving state of the car. In addition, when the car needs to be unparked urgently, such as when the car has no fuel and needs to be towed, the "emergency release brake button" connected with the single-chip microcomputer can be pressed to realize unparking. the

The electronic components used in the device of the utility model are all commercially available known products, and those skilled in the art can realize the specific connection of each electronic component according to the technical effect of the application. the

Referring to Fig. 2, the design principle of the utility model is to replace the button function of the traditional braking system based on the control of the single-chip microcomputer, and the single-chip microcomputer processes the data of each sensor and judges the parking state of the automobile. The working principle is as follows: assuming that the speed of the car is V and the road gradient is I, when the car is stationary on flat ground (i.e. V=0, I=0) and the clutch is in the non-working position, the parking brake system of the car automatically locks the wheels Live; when the car is moving to stationary, the vehicle speed sensor will continuously detect the vehicle speed and send it to the microcontroller in the form of a signal, and the microcontroller will judge whether the vehicle speed signal is zero, if the vehicle speed is not zero (that is, V≠0, I=0) , the single-chip microcomputer continues to judge the signal from the vehicle speed sensor until the vehicle speed is zero. If the speed of a vehicle is zero, then enter the next judging system, when the clutch does not work, the automobile parking brake system works, and when the clutch works, the device does not work. the

When the car starts on a slope (V=0, I≠0), the slope sensor is transmitted to the single-chip microcomputer, and the single-chip microcomputer judges whether the driving force is greater than the driving resistance. When the driving force is greater than the driving resistance, the parking brake system releases the brake The power makes the wheels roll, otherwise, the device works. the

To sum up, the electronic parking brake device based on the single-chip microcomputer of the present invention can realize automatic parking when parking, and release the brake when driving. the

Referring to Figure 3, provide 5v power to the single chip microcomputer to make it work normally. The PA0-PA3 ports are respectively connected to the wheel speed sensor, slope sensor, clutch position sensor, and brake motor position sensor. The four sensors are numbered 1-4 in sequence, and the PP1 port It is the signal terminal of the forward rotation of the motor, and the brake is implemented; the PP3 port is the signal terminal of the reverse rotation of the motor, and the brake is released. "Emergency brake release button" is connected to PB1 port. Combining Figure 1 and Figure 2, the implementation of parking has the following two situations:

(1) When sensors 1, 2, 3, and 4 respectively detect that the speed is zero, the slope is zero, the clutch is reset (not working), and the motor is reset (not working), the microcontroller controls the PP1 pin to output a high level, The drive motor rotates forward, so the car implements parking. the

(2) When sensors 1, 2, 3, and 4 detect that the speed is zero, the slope is not zero, the clutch is reset, and the motor is reset, the single-chip microcomputer controls the PP1 pin to output a high level, the motor rotates forward, and the car is parked . the

There are four situations for releasing parking:

(1) When the No. 1, No. 2 and No. 3 sensors respectively detect that the speed is not zero, the slope is zero, and the clutch is reset, the motor is at the reset position and the car is in a free state. the

(2) When sensors 1, 2, 3, and 4 respectively detect that the speed is zero, the slope is zero, the clutch is working, and the motor is at the braking position, the single-chip microcomputer controls the PP3 pin to output a high level, the motor reverses, and the release Parking. the

(3) When sensors 1, 2, 3, and 4 respectively detect that the speed is zero, the slope is not zero, the clutch is working, and the motor is at the braking position, the microcontroller will calculate the required driving force according to the angle and vehicle weight. When the driving force is greater than the driving resistance, the single-chip microcomputer controls the PP3 pin to output a high voltage, the motor reverses, and the brake is released. the

(4) In case of emergency, press the "emergency release brake button", the microcontroller will send a signal according to the command, drive the motor to reverse, and release the brake. the

Claims (9)

1. a SCM Based electronic brake device is characterized in that, comprises power supply, sensor unit, control unit; Wherein, Control unit is connected power supply respectively with sensor unit, and the mouth of sensor unit connects the input end of control unit, and control unit connects motor.

2. SCM Based electronic brake device as claimed in claim 1 is characterized in that, also comprises the emergency unchaining stop button, and this button is connected with control unit with power supply respectively.

3. SCM Based electronic brake device as claimed in claim 2 is characterized in that, said emergency unchaining stop button adopts the E538 button.

4. according to claim 1 or claim 2 SCM Based electronic brake device is characterized in that said sensor unit comprises wheel speed sensors, clutch position sensor, Slope Transducer, braking motor position transduser.

5. SCM Based electronic brake device as claimed in claim 4 is characterized in that, said wheel speed sensors adopts the hall effect type wheel speed sensors.

6. SCM Based electronic brake device as claimed in claim 4 is characterized in that, said clutch position sensor adopts G476.

7. SCM Based electronic brake device as claimed in claim 4 is characterized in that, said Slope Transducer adopts Finland SCA61T.

8. SCM Based electronic brake device as claimed in claim 4 is characterized in that, said braking motor position transduser adopts angular transposition type sensor.

9. SCM Based electronic brake device as claimed in claim 1 is characterized in that, said control unit adopts the MC9S12XS128 micro controller system.

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