A method for testing automobile ABS performance

Abstract

The invention belongs to the technical field of ABS performance test of mini pure electric trucks, and is specifically a vehicle ABS performance test method. The vehicle ABS performance test method needs to adopt an ABS performance test system. The ABS performance test system includes a data collector connected to a host computer for data transmission, and a wheel speed sensor, a brake sensor, a GPS signal sensor, and a GPS antenna connected to the data collector. Various ABS performance tests can be tested intuitively and accurately. The equipment is simple to operate and can be operated by one person.

Description

Technical Field

[0001] The invention relates to the technical field of ABS performance testing of a miniature pure electric truck, in particular to a method for testing the ABS performance of a truck. Background Art

[0002] ABS system is the abbreviation of Anti-locked Braking System in English. Its Chinese name is Anti-lock Braking System. As the name suggests, it means preventing the wheels from locking when braking.

[0003] The earliest automobile braking systems did not have ABS, which caused the front wheels to be locked when the vehicle braked in an emergency. At this time, the car would lose its steering ability and would hit the obstacle in front in a critical situation. If the rear wheels were locked, it would easily slip, increasing the risk factor. For cars equipped with ABS, when the vehicle braked in an emergency, the wheels would be in a state of rolling and sliding. At this time, the vehicle would not lose control and could flexibly avoid obstacles to avoid danger.

[0004] Automobile braking performance testing is one of the main nodes in the early stage of automobile design, and the automobile ABS performance needs to be tested frequently. Summary of the invention

[0005] The object of the present invention is to provide a method for testing the performance of an automobile ABS to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: a method for testing the performance of an automobile ABS, which requires the use of an ABS performance testing system, wherein the ABS performance testing system includes a data collector connected to a host computer for data transmission, and a wheel speed sensor, a brake sensor, a GPS signal sensor, and a GPS antenna connected to the data collector. The specific steps of the method for testing the performance of an automobile ABS are as follows:

[0007] Preparation: correctly install the wheel speed sensor, brake sensor, GPS signal sensor, GPS antenna and establish a connection with the data collector, connect the data collector to the host computer, turn on the power of the data collector, and integrate the anti-lock system performance test procedure with test methods, conditions and steps in the host computer. The anti-lock system performance test procedure includes braking performance when ABS fails, energy consumption test, braking strength and adhesion coefficient utilization rate measurement when the anti-lock system is working, adhesion coefficient measurement, braking strength measurement on the open road when the anti-lock system is working, and road test;

[0008] Operation method: Select the corresponding test option under the menu Anti-lock system performance test program, the system automatically enters the standby state, and displays the current test data. The test data collection interface is as follows:

[0009] The data acquisition interface is divided into: command window, test parameters, test data, test report, test data table, and function buttons:

[0010] A. Command window: Prompts are given during the test to guide the user to conduct the test;

[0011] B. Test parameters: Display the test parameters related to this type of test;

[0012] The parameters of the ABS failure test are load state, number of tests, specified vehicle speed, and braking distance limit;

[0013] The parameters of the energy consumption test are load state, number of tests, specified vehicle speed, and braking distance limit;

[0014] The parameters of the ZAL determination test are: load state, number of tests, specified vehicle speed, road adhesion coefficient selection, and test points;

[0015] The parameters of the K value determination test are: load state, number of tests, drive type, vehicle mass, front static axle load, rear static axle load, center of gravity height, and wheelbase;

[0016] The parameters of the ZMALS determination test are: number of tests, specified vehicle speed, and road adhesion coefficient;

[0017] The parameters of the road test are: load state, number of tests, specified vehicle speed, and road adhesion coefficient selection;

[0018] The load status needs to be selected by the user. The selection method is to click on the load status content to switch between full load and no load;

[0019] The prescribed speed is 50km / h;

[0020] The braking distance limit is automatically calculated based on the initial braking speed;

[0021] The test points and road surface types need to be selected by the user;

[0022] C. Test data: Displays basic test data, including distance, time, speed, steering angle, and pipeline pressure;

[0023] D. Test report: Display the content of the test report;

[0024] E. Test data table: Display the test results of each test in a list format. Click on the table to pop up related functions.

[0025] F. Function buttons: reset, start, return;

[0026] After entering the data acquisition interface, the system displays "Standby" in the command window and automatically tests the communication status with the data collector;

[0027] On the contrary, the command window displays "Press Z to start a test", and the user presses the Z key on the keyboard and clicks the start button with the mouse to start a test;

[0028] After the test starts, the command window displays "step on the brake pedal". After the driver steps on the brake pedal, the system automatically collects distance, time, speed and other values ​​and displays them in real time;

[0029] After the vehicle stops, the system automatically saves the test and returns to the standby interface.

[0030] Furthermore, the host computer is a notebook computer.

[0031] Furthermore, the front static axle load, rear static axle load, center of gravity height, and drive type are automatically filled in according to the vehicle type parameters set by the user.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] It can test various ABS performance tests intuitively and accurately. The equipment is easy to operate and can be operated by one person. The front wheel sensor is fixed by a slide and a rope, and the vehicle can turn flexibly. The test software uses a graphical separation interface, real-time display of data and graphics, and multiple measurement points to ensure test accuracy. It can store a large amount of test data, which is convenient for users to query and maintain. The test parameters are set as a graphical interface. Compared with the previous table input, the display is more intuitive. The sensor calibration is a pure software method, and the hardware deviation is compensated by software, which saves tedious hardware debugging and is easy to use. The system can generate files in various formats, which is convenient for citing in your own test report. The open data storage format is convenient for secondary development. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a system logic block diagram of the ABS performance test system of the present invention;

[0035] Figure 2 This is a diagram of the operating interface of the ABS performance testing system of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] Example:

[0039] See also Figure 1-2 The present invention provides a technical solution: a new energy vehicle ABS performance test system (with a laptop as the core, equipped with a corresponding data collector and various sensors (GPS (refresh frequency must be 100HZ), wheel speed, pedal force, pipeline pressure, force steering wheel, etc.), used for testing the performance of automobile ABS, with functions such as data storage, data processing, printing test results and curves, etc.

[0040] Main features of the system:

[0041] The vehicle speed and wheel speed are tested synchronously and in real time to achieve quantitative testing of wheel slip rate;

[0042] Replace hardware with software. Under the premise of ensuring the test frequency response, try to replace hardware functions with software to make the hardware circuit simple and reliable, easy to maintain, and reduce costs;

[0043] It has the function of data storage and processing, and can print the test results and their curves;

[0044] It has the function of automatic calibration coefficient and can adapt to the work of various sensors;

[0045] The data acquisition signal sampling frequency is as high as 100Hz, which fully meets the needs of high real-time performance of braking tests;

[0046] Can be connected with GPS speed sensor (100Hz) for easy operation;

[0047] Complete data processing function, automatically generate tables and Word files.

[0048] Test Method

[0049] The system can perform 6 different types of tests, namely:

[0050] Braking performance when ABS fails (hereinafter referred to as “ABS failure test”);

[0051] Energy consumption test (hereinafter referred to as "energy consumption test");

[0052] Determination of the braking intensity (ZAL) and ε (adhesion coefficient utilization) when the anti-lock system is working (hereinafter referred to as "ZAL determination");

[0053] Adhesion coefficient (K) determination (divided into high adhesion and low adhesion coefficient tests) (hereinafter referred to as "K value determination");

[0054] The ZMALS test is carried out when the anti-lock system is working (hereinafter referred to as the ZMALS test);

[0055] Additional requirements (road surface test) (divided into high adhesion coefficient road surface, low adhesion coefficient road surface, high-low adhesion coefficient road surface, low-high adhesion coefficient road surface, and split road surface test) (hereinafter referred to as "road surface test").

[0056] The specific usage methods of these six tests are almost the same. The following only takes the ABS failure test as an example to introduce the operation methods of the test:

[0057] Preparation: Correctly install the speed sensor, wheel speed sensor, etc., connect the data logger to the laptop, and turn on the power of the data logger.

[0058] Operation method: Select the braking performance when ABS fails in the pull-down menu Anti-lock system performance test, or press F2, the system automatically enters the standby state, and displays the current various test data. The test data collection interface is as follows: Figure 2 shown.

[0059] The data acquisition interface is divided into: command window, test parameters, test data, test report, test data table, and function buttons. The following is a brief introduction:

[0060] Command window: Give necessary prompts during the test to guide users to conduct various tests.

[0061] Test parameters: Display test parameters related to this type of test.

[0062] The parameters of the ABS failure test are load status (full load / no load), number of tests, specified vehicle speed, and braking distance limit;

[0063] The parameters of the energy consumption test are load status (full load / no load), number of tests, specified vehicle speed, and braking distance limit;

[0064] The parameters of the ZAL determination test are: load state (full load / no load), number of tests, specified vehicle speed, road adhesion coefficient selection, and test point (whole vehicle / front axle / rear axle);

[0065] The parameters of the K value determination test are: load state (full load / no load), number of tests, drive type, vehicle mass, front static axle load, rear static axle load, center of gravity height, and wheelbase;

[0066] The parameters of the ZMALS determination test are: number of tests, specified vehicle speed, and road adhesion coefficient (high / low);

[0067] The parameters of the road test are: load state (full load / no load), number of tests, specified vehicle speed, and road adhesion coefficient selection (high, low, high-low, low-high, open).

[0068] The front static axle load, rear static axle load, center of gravity height, and drive type are automatically filled in according to the vehicle model parameters set by the user;

[0069] The load status needs to be selected by the user. The selection method is to click the left button of the mouse on the load status content to switch between full load and no load;

[0070] The test number parameter needs to be entered by the user to distinguish different tests. This input field only accepts numbers. If you enter the number of repeated tests, after clicking the start button, the system will automatically prompt that the test with this number of tests already exists. The user can change the number of tests, or delete the original test with this number of tests and do it again;

[0071] The prescribed speed is generally 50km / h;

[0072] The braking distance limit is automatically calculated based on the initial braking speed;

[0073] The test point (whole vehicle / front axle / rear axle) and road surface type need to be selected by the user. For the selection of test points, please refer to the national standard.

[0074] Test data: Display various basic test data, including distance, time, speed, steering angle, and pipeline pressure.

[0075] Test report: Display the test report content.

[0076] Test data table: Displays the results of each test in a list format. Right-click in the table to pop up related functions, which will be introduced in detail below.

[0077] Function buttons: Reset (forcefully end the current test and return to standby mode), Start (start a test), and Return (return to the system main menu).

[0078] After entering the data acquisition interface, the system displays "Standby" in the command window and automatically tests the communication status with the data collector.

[0079] Otherwise, the command window displays "Press Z to start a test", and the user can press the Z key on the keyboard or click the start button with the mouse to start a test.

[0080] After the test starts, the command window displays "Step on the brake pedal". After the driver steps on the brake pedal (or the pedal force exceeds the pedal force threshold), the system automatically collects distance, time, speed and other values ​​and displays them in real time.

[0081] After the vehicle stops, the system automatically saves the test (adds a row to the data table) and returns to the standby interface.

[0082] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0083] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for testing the performance of an automobile ABS, characterized in that: The automobile ABS performance test method requires the use of an ABS performance test system, which includes a data collector connected to a host computer for data transmission, and a wheel speed sensor, a brake sensor, a GPS signal sensor, and a GPS antenna connected to the data collector. The specific steps of the automobile ABS performance test method are as follows: Preparation: correctly install the wheel speed sensor, brake sensor, GPS signal sensor, GPS antenna and establish a connection with the data collector, connect the data collector to the host computer, turn on the power of the data collector, and integrate the anti-lock system performance test procedure with test methods, conditions and steps in the host computer. The anti-lock system performance test procedure includes braking performance when ABS fails, energy consumption test, braking strength and adhesion coefficient utilization rate measurement when the anti-lock system is working, adhesion coefficient measurement, braking strength measurement on the open road when the anti-lock system is working, and road test; Operation method: Select the corresponding test option under the menu Anti-lock system performance test program, the system automatically enters the standby state, and displays the current test data. The test data collection interface is as follows: The data acquisition interface is divided into: command window, test parameters, test data, test report, test data table, and function buttons: A. Command window: gives prompts during the test to guide the user to conduct the test; B. Test parameters: Display test parameters related to the test; The parameters of ABS failure test are load state, test number, specified vehicle speed, and braking distance limit; The parameters of energy consumption test are load state, test number, specified vehicle speed, and braking distance limit; The parameters for the test of measuring the braking strength and adhesion coefficient utilization rate when the anti-lock system is working are: load state, number of tests, specified vehicle speed, road adhesion coefficient selection, and test points; The parameters of the adhesion coefficient determination test are: load state, number of tests, drive type, vehicle mass, front static axle load, rear static axle load, center of gravity height, and wheelbase; The parameters for the test of the braking strength on the open road when the anti-lock system is working are: the number of tests, the specified vehicle speed, and the road adhesion coefficient; The parameters of the road test are: load state, number of tests, specified vehicle speed, and road adhesion coefficient selection; The load status needs to be selected by the user. The selection method is to click on the load status content to switch between full load and no load; The prescribed speed is 50km / h; The braking distance limit is automatically calculated based on the initial braking speed; The test points and road surface types need to be selected by the user; C. Test data: Displays basic test data, including distance, time, speed, steering angle, and pipeline pressure; D. Test report: Display the content of the test report; E. Test data table: Display each test result in a list format. Click in the table to pop up related functions. F. Function buttons: reset, start, return; After entering the data acquisition interface, the system displays "Standby" in the command window and automatically tests the communication status with the data collector; On the contrary, the command window displays "Press Z to start a test", and the user presses the Z key on the keyboard and clicks the start button with the mouse to start a test; After the test starts, the command window displays "Step on the brake pedal". After the driver steps on the brake pedal, the system automatically collects distance, time, and speed values ​​and displays them in real time. After the vehicle stops, the system automatically saves the test and returns to the standby interface.

2. A method for testing automobile ABS performance according to claim 1, characterized in that: The host computer is a notebook computer.

3. A method for testing automobile ABS performance according to claim 1, characterized in that: The axle load, center of gravity height, and drive type are automatically filled in according to the vehicle model parameters set by the user.

Images