Esc test system and method based on sensor signals and uds diagnostics

Abstract

The application belongs to the technical field of vehicle manufacturing, and more particularly to an ESC test system and method based on sensor signals and UDS diagnosis; the ECU test method is used for important function detection of the ESC, including version information, wheel speed, electromagnetic coil, pump motor, function indicator lamp and function switch, and electronic parking caliper, for comprehensive detection; the ECU test platform mainly includes a sensor signal acquisition unit and an electrical simulation unit, so as to realize communication with the electronic control unit, simulation of the function indicator lamp and the switch signal, and acquisition of the related motion signals of the electromagnetic coil, the pump motor, the electronic parking caliper and the wheel speed; the application completes circuit function detection on the electronic control unit, meets the factory inspection requirement, is simple to operate, high in accuracy, and improves production efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vehicle manufacturing, and particularly relates to an ESC test system and method based on sensor signals and UDS diagnosis. BACKGROUND

[0002] Safety is an eternal theme in the automotive industry. With the development of the automotive industry, the number of cars in use is rapidly increasing, and traffic accidents are occurring frequently, causing huge personal and economic losses. In order to improve the active safety and handling stability of vehicles, the automotive electronic stability control system (Electronic Stability Controller, ESC) has emerged. ESC is developed on the basis of the anti-lock braking system (ABS) and the traction control system (TCS), combined with the direct yaw moment control system (AYC). Among them, ECU is a highly integrated control module of ESC, which receives the required signals, calculates and analyzes through the software program, and outputs the state signals and control instructions. The specific process is that ECU receives input signals such as wheel speed signal, steering wheel angle, gear position and engine torque, calculates key vehicle state signals such as vehicle speed, lateral speed, yaw angular velocity and slope according to the state estimation algorithm, and outputs control signals such as solenoid current, pump motor current, caliper motor current and torque reduction request according to the control strategies of ABS, TCS, AYC and vehicle additional functions, in order to control the hydraulic control unit (HCU) and electronic caliper, and finally realize the functions of ESC.

[0003] Considering that ESC is an important part to ensure the safety of automobile driving, it is necessary to test the function circuit of ECU before leaving the factory, so as to ensure the reliability and consistency of the product. According to the known published patent technologies, the patent technology (200620120237.4) realizes the direct observation of the working process of ABS braking system. The patent technology (200610034807.2) is used for parameter matching and program debugging of ABS by simulating the working state of the wheel. At present, there is no ready-made performance test system for detection on the ECU production line. Therefore, in view of the above situation, it is urgent to develop an ECU function test system of vehicle electronic stability control system to meet the needs of actual use. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, use real actuators to detect all pins of ECU, provide a test system for ECU production line, customize for ESC function test requirements, easy to operate, automatic detection, meet the ECU factory inspection requirements, and the present application provides the following technical scheme:

[0005] This invention relates to an ESC testing system based on sensor signals and UDS diagnostics, used for testing on ECU production lines. It includes a sensor signal acquisition unit, an electrical simulation unit, a host computer, an electrical cabinet, and a testing platform. The system is characterized in that the host computer sends test requests according to the testing sequence, the ECU executes relevant instructions, and sends back a response message containing status information.

[0006] The test platform includes a workbench and an ECU connector and ECU limiter on the workbench. Magnetoelectric, Hall effect, and intelligent sensors, as well as a gear ring simulating wheel rotation, are installed on the wheel speed platform bracket. The electronic parking caliper is installed on the brake pad bracket. A plasma fan eliminates static electricity. The emergency stop switch is placed on the left side of the workbench. The sensor signals collected by the sensor signal acquisition unit include wheel speed signals, analog signals of electronic caliper operating current, analog signals of valve and pump motor operating current, digital signals of function indicator lights, digital signals of function switches, wheel speed hard-wired frequency signal WSO, and vehicle speed hard-wired frequency signal VSO.

[0007] The ESC test system is used to perform the ESC test method for sensor signal and UDS diagnosis, including the following steps:

[0008] A. Before testing, users should pre-calibrate test item information and qualification indicators, pre-write version information, current, stress, wheel speed qualification thresholds, and UDS positive response.

[0009] B. The user places the ECU into the ECU limiter, presses the start button on the worktable, the connector cylinder extends, and performs a power-on test.

[0010] C. The host computer in the electrical cabinet reads the version information through UDS and verifies the C1 supplier information, C2 component number, C3 bootloader version information, C4 hardware version information, C5 underlying version information, C6 APP software serial number, and C7 APP software version to ensure that the program is burned correctly.

[0011] D. Secure access service allows access to protected services by changing different security levels; the security level is changed.

[0012] E. The host computer sends an ESC test case start request. The ECU controls the electromagnetic coils and pump motors corresponding to the boost valve, pressure reducing valve, pressure limiting valve, and suction valve to operate in sequence. The current of the power supply lines of the valve and pump motor in the connector changes. The host computer collects the current value through the current sensor to determine whether the actuator operation current is qualified.

[0013] F, the host computer sends an EPB use case test start request, uses an EPB switch to control an electronic parking brake caliper to clamp and release, collects the caliper motor current value, the friction plate strain sensor clamping voltage value, the EPB switch state and the CAN message of the left and right caliper currents through two current sensors connected to the positive and negative electrodes of the caliper, and respectively judges F1 EPB clamping test, F2 EPB release test, F3 EPB clamping stress test, F4 EPB switch test and F5 caliper current difference test;

[0014] G, the host computer sequentially executes the procedures of reading fault codes, identifying fault codes and clearing fault codes to meet the factory requirements;

[0015] H, the function indicator light includes an APB, an AVH and an HID indicator light, the host computer sends a specific ID and a message to control the function indicator light to cycle and light up in turn;

[0016] J, the host computer sends an ECU soft restart instruction, and the ECU returns a positive or negative response;

[0017] K, the host computer controls the motor to drive the gear ring to rotate at a certain speed after 5 seconds of uniform acceleration, and maintains a uniform speed for 5 seconds, the ECU collects the wheel speed signal through the wheel speed sensor and sends it to the host computer, and the host computer analyzes and judges the wheel speed information under the acceleration and uniform speed conditions according to the UDS communication protocol;

[0018] L, during the test K step, the host computer collects the wheel speed hard line frequency signal output by the ECU through a frequency acquisition board and judges it;

[0019] M, the test is completed.

[0020] As a preferred technical solution of the application, the host computer receives the sensor signal, and judges whether the ECU is qualified according to the response diagnosis logic.

[0021] As a preferred technical solution of the application, based on the unified diagnostic service UDS, the host computer sends a test request, and the ECU executes related instructions and returns expected information.

[0022] As a preferred technical solution of the application, according to the test request, the ECU controls the real actuator to perform related actual actions.

[0023] The application has the beneficial effects that: compared with the traditional ESC controller printed circuit board (PCBA) test board, the automobile electronic stability control system ECU test system based on sensor signals and UDS diagnosis detects important functions of the ESC, including wheel speed, electromagnetic coil, pump motor, function indicator light and function switch, etc., ensures the accuracy of ECU acquisition, conversion and output of wheel speed, ensures the normal work of the driving circuit of the electromagnetic coil and the pump motor in the processes of pressure increase, pressure reduction, pressure maintenance and active pressure increase, and verifies the normal action of the electronic parking caliper when the EPB, HHC and HDC work. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, illustrate the application, and are used to explain the application together with the embodiments of the application, and do not constitute a limitation on the application. In the drawings:

[0025] Figure 1 It is an ESC overall test platform schematic diagram in the ESC test system based on sensor signals and UDS diagnosis of the application;

[0026] Figure 2 It is an ECU performance test method flowchart in the ESC test method based on sensor signals and UDS diagnosis of the application;

[0027] Figure 3 It is a version information schematic diagram in the ESC test method based on sensor signals and UDS diagnosis of the application;

[0028] Figure 4 It is a session mode switching flowchart in the ESC test method based on sensor signals and UDS diagnosis of the application;

[0029] Figure 5 It is an ESC test case flowchart in the ESC test method based on sensor signals and UDS diagnosis of the application;

[0030] Figure 6 It is an EPB test case flowchart in the ESC test method based on sensor signals and UDS diagnosis of the application. DETAILED DESCRIPTION

[0031] With reference to the accompanying drawings: clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0032] According to Figure 1 As shown in the figure, the ESC test system and method based on sensor signals and UDS diagnosis includes a sensor signal acquisition unit, an electrical simulation unit, a host computer, an electrical cabinet, and a test platform. The test system is based on sensor signals and UDS diagnosis. The host computer sends test requests according to the detection step sequence. The ECU executes relevant instructions and feeds back response messages containing state information. The test platform includes a workbench 1, ECU 3 connectors on the workbench, and an ECU limiting table 2. Magnetic, Hall, and intelligent sensors are installed on the wheel speed table support 6, and a gear ring 7 simulates wheel rotation. Electronic parking calipers are installed on the brake pad support 4. Plasma fans 5 eliminate static electricity. An emergency stop switch 8 is placed on the left side of the workbench 1. The electrical simulation unit in the electrical cabinet simulates ECU function indicator light output signals and ECU function switch input signals. The sensor signal acquisition unit collects valve and pump motor current values at the ECU connector through current sensors and collects electronic parking caliper action current values. It collects WSOVSO hard-wire frequency signals through frequency acquisition, and uses stress sensors to obtain caliper clamping stress. The final test results are displayed on the display screen and indicator lights of the workbench 1.

[0033] In combination Figure 1 With Figure 2 , the test method flow is described in detail as follows:

[0034] A, as Figure 2 shown, the user calibrates the test item information and qualified indicators in advance before testing, writes the version information in advance, and sets the current, stress, wheel speed qualified threshold, and UDS positive response;

[0035] B, the user places the ECU 3 in the limiting table 2, presses the start button on the workbench 1, the connector cylinder extends, and the power-on test is performed;

[0036] C, in combination Figure 3 with the figure, the host computer in the electrical cabinet reads the version information through UDS, and respectively checks C1 supplier information, C2 part number, C3 Bootloader version information, C4 hardware version information, C5 bottom layer version information, C6 APP software serial number, and C7 APP software version, to ensure that the program is burned correctly;

[0037] D, in combination Figure 4As shown, the secure access service accesses the protected service by changing different security levels, which requires the following four steps: D1 The host sends a switching extended session mode request, the controller 7 switches from the default session mode to the extended session mode after receiving the request, and returns a positive response; D2 The host receives the positive response and sends a switching factory mode request, the controller 7 switches from the extended session mode to the factory mode after receiving the request, and returns a positive response; D3 The host requests a seed, and the ECU 3 sends the seed data to the host; D4 The host obtains the key through the decryption algorithm according to the seed data, sends it to the ECU 3, and the ECU 3 returns a positive response while switching to a new security level;

[0038] E, combination Figure 5 As shown, the host sends an ESC use case test start request, the ECU 3 controls the electromagnetic coils corresponding to the supercharging valve, pressure reducing valve, pressure limiting valve and suction valve and the pump motor to act in turn, the current of the valve and pump motor power supply line in the connector changes, and the host collects the current value through the current sensor to judge whether the actuator action current is qualified;

[0039] F, combination Figure 6 As shown, the host sends an EPB use case test start request, uses the EPB switch to control the electronic parking caliper to clamp and release, collects the caliper motor current value, friction plate strain sensor clamping voltage value, EPB switch state and left and right caliper current CAN messages through two current sensors connected to the positive and negative electrodes of the caliper, and respectively judges F1 EPB clamping test, F2 EPB release test, F3 EPB clamping stress test, F4 EPB switch test and F5 caliper current difference test;

[0040] G, the host sequentially executes the procedures of reading fault codes, identifying fault codes and clearing fault codes to meet the factory requirements;

[0041] H, the function indicator light includes APB, AVH and HID indicator lights, the host sends a specific ID and message to control the function indicator light to cycle and light up in turn; The judgment logic is: during the test process, whether the relay meets the requirements of not being able to be attracted at the same time and at least one being attracted, and whether the ECU is qualified is judged;

[0042] J, the host sends an ECU soft reset instruction, and the ECU 3 returns a positive or negative response;

[0043] K, the host computer controls the motor to drive the gear ring 7 to rotate at a certain speed after 5 seconds of uniform acceleration, and maintains the uniform speed for 5 seconds. The ECU 3 collects the wheel speed signal through the wheel speed sensor and sends it to the host computer. The host computer analyzes and judges the wheel speed information under the acceleration and uniform speed conditions according to the UDS communication protocol. The qualified judgment method is that the current sampling wheel speed value must be greater than the last time wheel speed value during uniform acceleration, and the wheel speed is maintained within a certain threshold interval during uniform speed process;

[0044] L, during the K step test, the host computer collects the wheel speed frequency signal output by the ECU through the frequency acquisition board card and judges;

[0045] M, test completion; after the ECU 3 test is qualified, the plug-in cylinder exits, and the relevant test results and performance evaluation results can be displayed on the display of the workbench 1 according to the requirements.

[0046] In the description of the present application, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "central", "both ends" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

[0047] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "threading" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited, the above-mentioned terms in the present application can be understood according to the specific meaning of the above-mentioned terms in the present application according to the specific situation.

[0048] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An ESC testing system based on sensor signals and UDS diagnostics, used for testing on the ECU production line, comprising a sensor signal acquisition unit, an electrical simulation unit, a host computer, an electrical cabinet, and a testing platform, characterized in that: The host computer sends a test request according to a detection step sequence, the ECU executes relevant instructions, and a response message containing state information is fed back; The test platform comprises a workbench, an ECU connector and an ECU limiting table on the workbench, a magnetic, Hall and intelligent sensor installed on a wheel speed table support and a gear ring simulating the rotation of a vehicle wheel, an electronic parking caliper installed on a brake pad support, a plasma fan for eliminating static electricity, an emergency stop switch placed on the left side of the workbench, and a sensor signal acquisition unit for acquiring sensor signals including a wheel speed signal, an electronic caliper action current analog signal, a valve and pump motor action current analog signal, a function indicator light digital signal, a function switch digital signal, a wheel speed hard-wire frequency signal WSO and a vehicle speed hard-wire frequency signal VSO; The ESC test system is used to execute the ESC test method of the sensor signals and UDS diagnosis, and comprises the following steps: A. The user calibrates test item information and qualified indicators in advance before testing, writes version information in advance, and sets current, stress and wheel speed qualified thresholds and UDS positive response; B. The user places the ECU in the ECU limiting table, presses the start button on the workbench, and the connector cylinder extends to perform power-on testing; C. The host computer in the electrical cabinet reads version information through UDS, and respectively checks C1 supplier information, C2 part number, C3 Bootloader version information, C4 hardware version information, C5 bottom layer version information, C6 APP software serial number and C7 APP software version to ensure correct program burning; D. The secure access service accesses the protected service by changing different security levels, and changes the security level; E. The host computer sends an ESC case test start request, the ECU controls the electromagnetic coils corresponding to the pressure increasing valve, pressure reducing valve, pressure limiting valve and suction valve and the pump motor to act in turn, the current of the valve and pump motor power supply line in the connector changes, the host computer acquires the current value through the current sensor to determine whether the actuator action current is qualified; F. The host computer sends an EPB case test start request, uses the EPB switch to control the electronic parking caliper to clamp and release, acquires the caliper motor current value, the friction plate strain sensor clamping voltage value, the EPB switch state and the CAN message of the left and right caliper currents through two current sensors connected to the positive and negative electrodes of the caliper, and respectively determines F1 EPB clamping test, F2 EPB release test, F3 EPB clamping stress test, F4 EPB switch test and F5 caliper current difference test; G. The host computer sequentially executes the procedures of reading fault codes, identifying fault codes and clearing fault codes to meet the factory requirements; H. The function indicator light comprises an APB, an AVH and an HID indicator light, the host computer sends a specific ID and a message to control the function indicator light to cycle and light up in turn; J. The host computer sends an ECU soft reset instruction, and the ECU returns a positive or negative response. K、The host computer controls the motor to drive the gear ring to uniformly accelerate for 5 seconds to reach a certain speed, and then maintain a uniform speed for 5 seconds. The ECU collects the wheel speed signal through the wheel speed sensor and transmits it to the host computer. The host computer analyzes the wheel speed information under the acceleration and uniform speed conditions and makes a judgment according to the UDS communication protocol. L、During the K step, the host computer collects the wheel speed hardwire frequency signal output by the ECU through the frequency acquisition board card and makes a judgment. M、Test completion.

2. The ESC test system based on sensor signals and UDS diagnostics of claim 1, wherein: The host computer receives the sensor signal and determines whether the ECU is qualified according to the response diagnosis logic.

3. The ESC test system based on sensor signals and UDS diagnostics of claim 1, wherein: Based on the unified diagnostic service UDS, the host computer sends a test request, and the ECU executes the relevant instructions and returns the expected information.

4. The ESC test system based on sensor signals and UDS diagnostics of claim 1, wherein: According to the test request, the ECU controls the real actuators to perform the relevant actual actions.

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