阅读说明：本技术 一种电动汽车的刹车片磨损程度检测方法 (method for detecting abrasion degree of brake pad of electric automobile ) 是由 王皖 周明军 王长江 于 2019-09-19 设计创作，主要内容包括：本发明公开了一种电动汽车的刹车片磨损程度检测方法,包括硬件的配置、设定制动力点位、制动力计算、记录制动踏板开度、初始制动踏板开度平均值的获取、运行中制动踏板开度平均值的获取、对比、磨损程度的获得、显示和报警一系列步骤。通过压力传感器能感受压力信号,并能按照一定的规律将压力信号转换成可用的输出的电信号,通过踩制动踏板对压力传感器造成压力之后,整车控制器对其读取电压值,得到当前制动踏板开度,通过整车控制器,用于记录数据生成表格,计算刹车片磨损程度,通过车载显示屏实时显示刹车片磨损程度数据,便于实时检测刹车片磨损情况,且采用原车具有设备,成本低。(the invention discloses a method for detecting the abrasion degree of a brake pad of an electric automobile, which comprises a series of steps of hardware configuration, braking force point location setting, braking force calculation, brake pedal opening recording, initial brake pedal opening average value obtaining, comparison, abrasion degree obtaining, display and alarm. Can experience pressure signal through pressure sensor to can be according to the signal of telecommunication of certain law with pressure signal conversion usable output, after leading to the pressure to pressure sensor through stepping on brake pedal, vehicle control unit reads the voltage value to it, obtain current brake pedal aperture, through vehicle control unit, be used for the record data to generate the form, calculate brake block degree of wear, show brake block degree of wear data in real time through on-vehicle display screen, be convenient for real-time detection brake block degree of wear, and adopt former car to have equipment, and is with low costs.)

1. a method for detecting the abrasion degree of a brake pad of an electric automobile is characterized by comprising the following steps: the method specifically comprises the following steps:

S1: hardware configuration: the electric automobile is provided with a whole automobile controller, a brake pad, a brake pedal, a pressure sensor and a vehicle-mounted display screen, the whole automobile controller is in signal connection with the vehicle-mounted display screen through a CAN bus, the brake pad is installed on the side portion of a hub of an automobile body and is mechanically connected with the brake pedal, the pressure sensor is installed in the automobile body and is connected with the brake pedal, and the pressure sensor is electrically connected with the whole automobile controller through the CAN bus;

s2: setting a braking force point position: when the brake pad is initially used, a constant braking force point position is set artificially, a safety numerical value of the abrasion degree of the brake pad is set artificially, and the braking force point position value and the safety numerical value of the abrasion degree of the brake pad are input into the whole vehicle controller;

s3: and (3) calculating braking force: the method comprises the steps that a driver steps on a brake pedal, the speed before the brake pedal is stepped and the speed after the brake pedal is stepped are called through a vehicle control unit, the acceleration of the vehicle is calculated by utilizing the speed difference between the speed before the brake pedal is stepped and the speed after the brake pedal is stepped, and the current braking force is further calculated;

s4: recording the opening degree of a brake pedal: after the pressure sensor is stressed by stepping on the brake pedal, the pressure sensor senses a pressure signal, converts the pressure signal into an available output electric signal according to a certain rule, and transmits the output electric signal to the vehicle control unit, the vehicle control unit reads a voltage value to obtain the opening degree of the brake pedal, the point position of the braking force calculated in the step S3 is recorded by the vehicle control unit after the current opening degree of the brake pedal is recorded after the braking force reaches the braking force point position set in the step S3;

s5: obtaining an average value of the opening degree of the initial brake pedal: repeating the steps S2 and S3 to obtain ten groups of brake pedal opening data, calculating the obtained ten groups of data by using the finished automobile controller to obtain an initial average value of the ten groups of data, and recording and storing the obtained initial average value by using the finished automobile controller;

s6: obtaining an average value of the opening degree of the brake pedal during operation: when the automobile runs, repeating the contents in the steps S2 and S3, then calculating and storing an average value by using the whole automobile controller for every ten groups of brake pedal opening degrees, and obtaining the average value of the brake pedal opening degrees in running;

S7: and (3) comparison: comparing the average value of the in-service brake pedal opening obtained in step S6 with the initial average value of the brake pedal opening obtained in step S5 to obtain brake pedal opening comparison data;

S8: obtaining the abrasion degree: calculating corresponding brake pad wear data through the vehicle controller according to the comparison result in the S7 to obtain the current wear degree of the brake pad;

S9: displaying: the wear degree of the brake pad is sent to a vehicle-mounted display screen through a CAN bus, the current wear degree data of the brake pad is displayed by the vehicle-mounted display screen, and then the wear degree data of the brake pad is obtained in real time in the running process;

s10: and (4) alarming: and the vehicle control unit compares the brake pad wear degree data obtained in real time with the brake pad wear degree safety value obtained in the step S2, and gives an alarm when the brake pad wear degree data obtained in real time is greater than the brake pad wear degree safety value, otherwise, does not give an alarm.

2. The method for detecting the abrasion degree of the brake pad of the electric automobile according to claim 1, characterized in that: in step S1, the pressure sensor is a semiconductor piezoelectric resistor type pressure sensor, and the on-board display screen is a touch display screen.

3. The method for detecting the abrasion degree of the brake pad of the electric automobile according to claim 1, characterized in that: in step S3, the vehicle speed is obtained by measuring the rotation speed of the tire.

4. the method for detecting the abrasion degree of the brake pad of the electric automobile according to claim 1, characterized in that: in the steps S4, S5, and S6, the vehicle control unit includes a memory.

5. The method for detecting the abrasion degree of the brake pad of the electric automobile according to claim 1, characterized in that: in the steps S7, S8, and S9, the data of the wear degree of the brake pad is converted into force by the vehicle controller, and then the corresponding data is displayed in units of millimeters.

6. The method for detecting the abrasion degree of the brake pad of the electric automobile according to claim 1, characterized in that: in the step S10, a buzzer is used for alarming, and the buzzer is electrically connected with the vehicle control unit.

Technical Field

the invention relates to the technical field of brake pad wear degree detection, in particular to a brake pad wear degree detection method of an electric automobile.

background

the electric automobile is a complex system composed of a plurality of subsystems, and mainly comprises a power system such as a battery, a motor, a gearbox, a brake and the like, and other accessories such as an air conditioner, a power-assisted steering and the like, wherein each subsystem almost completes respective functions and targets through a control unit of the subsystem, and in order to meet the targets of the power performance, the economy, the safety and the comfort of the whole automobile, on one hand, an intelligent human-vehicle interaction interface is required, on the other hand, the subsystems are required to cooperate with each other, and the whole automobile controller is a core control part of the whole automobile and is equivalent to the brain of the automobile, collects signals of an accelerator pedal, signals of a brake pedal and other parts, and controls the action of each part controller at the lower layer after corresponding judgment is made, so as to drive the automobile to normally run.

in the braking system of the car, the brake block is the most critical safety part, and the brake block plays a decisive role in the braking effect of all cars, so the good brake block is the protection spirit of people and cars, and the kinetic energy of the car is converted into the heat energy after friction by the friction between the brake block and between the tyre and the ground, so that the car is stopped.

the brake pad is generally composed of a steel plate, a bonding heat insulation layer and a friction block, wherein the steel plate is coated to prevent rust, a furnace temperature tracker is used for detecting temperature distribution in the coating process to ensure quality, the heat insulation layer is composed of heat insulation materials and aims at heat insulation, the friction block is composed of friction materials and adhesives, and the friction materials are extruded on a brake disc or a brake drum to generate friction when braking, so that the aim of decelerating and braking of a vehicle is fulfilled.

the wearing and tearing of brake block detect the personal safety vital importance to navigating mate, at present, generally utilize mechanical principle to detect the degree of wear of brake block, and the brake block just can know its degree of wear after wearing and tearing to a definite value, can't let the driver know the wearing and tearing condition of brake block in real time, has great potential safety hazard.

Disclosure of Invention

The invention aims to provide a method for detecting the abrasion degree of a brake pad of an electric automobile, which can sense a pressure signal through a pressure sensor, convert the pressure signal into a usable output electric signal according to a certain rule, read a voltage value by a vehicle control unit after the pressure sensor is pressed by stepping on a brake pedal to obtain the current brake pedal opening degree, record a data generation table through the vehicle control unit to calculate the abrasion degree of the brake pad, display the abrasion degree data of the brake pad in real time through a vehicle-mounted display screen, obtain an average value of the initial brake pedal opening degree in the initial operation process and obtain an average value of the brake pedal opening degree in the operation process in real time through setting an initial braking force point position and a safety value of the abrasion degree of the brake pad in the operation process, and obtain and display the abrasion degree data of the brake pad under the processing of the vehicle control unit, the brake pad wear degree detection device has the advantages that the brake pad wear degree detection device can give an alarm and prompt, the current brake pad wear degree can be accurately known, the adopted equipment is original automobile equipment, the brake pad wear degree detection device is effectively achieved under the condition that the equipment cost is not increased, and the brake pad wear degree detection device is low in manufacturing cost and solves the problem of the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: a method for detecting the abrasion degree of a brake pad of an electric automobile specifically comprises the following steps:

s1: hardware configuration: the electric automobile is provided with a whole automobile controller, a brake pad, a brake pedal, a pressure sensor and a vehicle-mounted display screen, the whole automobile controller is in signal connection with the vehicle-mounted display screen through a CAN bus, the brake pad is installed on the side portion of a hub of an automobile body and is mechanically connected with the brake pedal, the pressure sensor is installed in the automobile body and is connected with the brake pedal, and the pressure sensor is electrically connected with the whole automobile controller through the CAN bus;

S2: setting a braking force point position: when the brake pad is initially used, a constant braking force point position is set artificially, a safety numerical value of the abrasion degree of the brake pad is set artificially, and the braking force point position value and the safety numerical value of the abrasion degree of the brake pad are input into the whole vehicle controller;

s3: and (3) calculating braking force: the method comprises the steps that a driver steps on a brake pedal, the speed before the brake pedal is stepped and the speed after the brake pedal is stepped are called through a vehicle control unit, the acceleration of the vehicle is calculated by utilizing the speed difference between the speed before the brake pedal is stepped and the speed after the brake pedal is stepped, and the current braking force is further calculated;

S4: recording the opening degree of a brake pedal: after the pressure sensor is stressed by stepping on the brake pedal, the pressure sensor senses a pressure signal, converts the pressure signal into an available output electric signal according to a certain rule, and transmits the output electric signal to the vehicle control unit, the vehicle control unit reads a voltage value to obtain the opening degree of the brake pedal, the point position of the braking force calculated in the step S3 is recorded by the vehicle control unit after the current opening degree of the brake pedal is recorded after the braking force reaches the braking force point position set in the step S3;

S5: obtaining an average value of the opening degree of the initial brake pedal: repeating the steps S2 and S3 to obtain ten groups of brake pedal opening data, calculating the obtained ten groups of data by using the finished automobile controller to obtain an initial average value of the ten groups of data, and recording and storing the obtained initial average value by using the finished automobile controller;

S6: obtaining an average value of the opening degree of the brake pedal during operation: when the automobile runs, repeating the contents in the steps S2 and S3, then calculating and storing an average value by using the whole automobile controller for every ten groups of brake pedal opening degrees, and obtaining the average value of the brake pedal opening degrees in running;

S7: and (3) comparison: comparing the average value of the in-service brake pedal opening obtained in step S6 with the initial average value of the brake pedal opening obtained in step S5 to obtain brake pedal opening comparison data;

s8: obtaining the abrasion degree: calculating corresponding brake pad wear data through the vehicle controller according to the comparison result in the S7 to obtain the current wear degree of the brake pad;

s9: displaying: the wear degree of the brake pad is sent to a vehicle-mounted display screen through a CAN bus, the current wear degree data of the brake pad is displayed by the vehicle-mounted display screen, and then the wear degree data of the brake pad is obtained in real time in the running process;

S10: and (4) alarming: and the vehicle control unit compares the brake pad wear degree data obtained in real time with the brake pad wear degree safety value obtained in the step S2, and gives an alarm when the brake pad wear degree data obtained in real time is greater than the brake pad wear degree safety value, otherwise, does not give an alarm.

Preferably, in step S1, the pressure sensor is a semiconductor piezoelectric resistor type pressure sensor, and the on-vehicle display screen is a touch display screen.

preferably, in step S3, the vehicle speed is obtained by measuring the rotation speed of the tire.

Preferably, in steps S4, S5, and S6, the vehicle control unit includes a memory.

preferably, in the steps S7, S8, and S9, the data of the wear degree of the brake pad is converted into force by the vehicle control unit, and then the data is displayed in units of millimeters.

Preferably, in the step S10, the alarm is given by a buzzer, and the buzzer is electrically connected with the vehicle control unit.

Compared with the prior art, the invention has the beneficial effects that:

1. The pressure sensor can sense the pressure signal and convert the pressure signal into a usable output electric signal according to a certain rule, after the pressure sensor is pressed by stepping on the brake pedal, the vehicle control unit reads the voltage value to obtain the current brake pedal opening, and through the vehicle control unit, is used for recording data to generate a table, calculating the abrasion degree of the brake pad, displaying the abrasion degree data of the brake pad in real time through a vehicle-mounted display screen, by setting an initial braking force point position and a brake pad abrasion degree safety value, obtaining an initial brake pedal opening degree average value in the initial operation and obtaining the brake pedal opening degree average value in the operation in real time in the operation process, under the processing of the whole vehicle controller, the wear degree data of the brake pad is obtained and displayed, and alarming and prompting are carried out, so that the current wear degree of the brake pad can be more accurately known;

2. And the adopted equipment is the original equipment of the automobile, the detection of the abrasion degree of the brake pad is effectively realized under the condition that the equipment cost is not increased, and the manufacturing cost is low.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

the invention provides a technical scheme that: a method for detecting the abrasion degree of a brake pad of an electric automobile specifically comprises the following steps:

s1: hardware configuration: the electric automobile is provided with a whole automobile controller, a brake pad, a brake pedal, a pressure sensor and a vehicle-mounted display screen, the whole automobile controller is in signal connection with the vehicle-mounted display screen through a CAN bus, the brake pad is installed on the side portion of a hub of an automobile body and is mechanically connected with the brake pedal, the pressure sensor is installed in the automobile body and is connected with the brake pedal, and the pressure sensor is electrically connected with the whole automobile controller through the CAN bus;

s2: setting a braking force point position: when the brake pad is initially used, a constant braking force point position is set artificially, a safety numerical value of the abrasion degree of the brake pad is set artificially, and the braking force point position value and the safety numerical value of the abrasion degree of the brake pad are input into the whole vehicle controller;

s3: and (3) calculating braking force: the method comprises the steps that a driver steps on a brake pedal, the speed before the brake pedal is stepped and the speed after the brake pedal is stepped are called through a vehicle control unit, the acceleration of the vehicle is calculated by utilizing the speed difference between the speed before the brake pedal is stepped and the speed after the brake pedal is stepped, and the current braking force is further calculated;

S4: recording the opening degree of a brake pedal: after the pressure sensor is stressed by stepping on the brake pedal, the pressure sensor senses a pressure signal, converts the pressure signal into an available output electric signal according to a certain rule, and transmits the output electric signal to the vehicle control unit, the vehicle control unit reads a voltage value to obtain the opening degree of the brake pedal, the point position of the braking force calculated in the step S3 is recorded by the vehicle control unit after the current opening degree of the brake pedal is recorded after the braking force reaches the braking force point position set in the step S3;

s5: obtaining an average value of the opening degree of the initial brake pedal: repeating the steps S2 and S3 to obtain ten groups of brake pedal opening data, calculating the obtained ten groups of data by using the finished automobile controller to obtain an initial average value of the ten groups of data, and recording and storing the obtained initial average value by using the finished automobile controller;

S6: obtaining an average value of the opening degree of the brake pedal during operation: when the automobile runs, repeating the contents in the steps S2 and S3, then calculating and storing an average value by using the whole automobile controller for every ten groups of brake pedal opening degrees, and obtaining the average value of the brake pedal opening degrees in running;

S7: and (3) comparison: comparing the average value of the in-service brake pedal opening obtained in step S6 with the initial average value of the brake pedal opening obtained in step S5 to obtain brake pedal opening comparison data;

S8: obtaining the abrasion degree: calculating corresponding brake pad wear data through the vehicle controller according to the comparison result in the S7 to obtain the current wear degree of the brake pad;

S9: displaying: the wear degree of the brake pad is sent to a vehicle-mounted display screen through a CAN bus, the current wear degree data of the brake pad is displayed by the vehicle-mounted display screen, and then the wear degree data of the brake pad is obtained in real time in the running process;

s10: and (4) alarming: and the vehicle control unit compares the brake pad wear degree data obtained in real time with the brake pad wear degree safety value obtained in the step S2, and gives an alarm when the brake pad wear degree data obtained in real time is greater than the brake pad wear degree safety value, otherwise, does not give an alarm.

Preferably, in step S1, the pressure sensor is a semiconductor piezoelectric resistor type pressure sensor, and the on-board display screen is a touch display screen, which facilitates data input.

Preferably, in step S3, the vehicle speed is obtained by measuring the rotation speed of the tire, so as to facilitate obtaining the vehicle speed and calculating the acceleration.

preferably, in the steps S4, S5 and S6, the vehicle control unit has a memory therein.

preferably, in the steps S7, S8 and S9, the data of the wear degree of the brake pad is converted by the vehicle controller to generate force, and then the data is displayed in units of millimeters.

Preferably, in the step S10, the alarm is given by a buzzer, and the buzzer is electrically connected with the vehicle control unit.

Compared with the prior art, the pressure sensor can sense a pressure signal, the pressure signal can be converted into a usable output electric signal according to a certain rule, after the pressure sensor is pressed by stepping on the brake pedal, the vehicle control unit reads a voltage value to obtain the current brake pedal opening degree, the vehicle control unit is used for recording data to generate a table and calculating the brake pad abrasion degree, the vehicle-mounted display screen is used for displaying the brake pad abrasion degree data in real time, the vehicle control unit obtains the initial brake pedal opening degree average value in the initial operation and obtains the brake pedal opening degree average value in the operation process by setting the initial braking force point position and the brake pad abrasion degree safety value, the vehicle control unit obtains and displays the brake pad abrasion degree data under the processing of the vehicle control unit to alarm and prompt so as to more accurately know the current brake pad abrasion degree, and the adopted equipment is the original equipment of the automobile, the detection of the abrasion degree of the brake pad is effectively realized under the condition that the equipment cost is not increased, and the manufacturing cost is low.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.