Automatic DTC testing device for automobile ECU

Abstract

The utility model provides an automobile ECU automation DTC test device, which comprises a test host, a programmable power supply, a relay, a communication interface device and a wire harness module, the test host is respectively in communication connection with the communication interface device, the programmable power supply and the relay, the programmable power supply is connected with an ECU through the wire harness module, and the relay is connected with the ECU through the wire harness module. The communication interface device is in communication connection with the ECU through the wire harness module, the test host is in communication connection with the relay through the wire harness module, and the relay is electrically connected with the ECU. The test host is used to directly control the programmable power supply, adjust the on-off of the power supply and set the voltage of the power supply. By adding the relay between the wiring harness module and the ECU, trigger control of faults such as ECU channel open circuit and short circuit, channel short circuit to a power supply and channel short circuit to the ground is realized, so that automatic trigger of DTC faults is realized, and full-automatic test of the ECU about a DTC fault recording function is completed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a car test technical field especially relates to a car ECU automation DTC testing arrangement. BACKGROUND

[0002] With the continuous development and popularization of modern automobile electronic system, automobile diagnosis test also becomes more and more important, UdsOnCAN communication protocol and DoIP communication protocol are widely used in vehicle communication technology, to complete the diagnosis and maintenance function, wherein the DTC (Diagnostic Trouble Code) test of vehicle ECU (Electronic Control Unit) is a very important link in vehicle diagnosis and repair. Generally, the communication between diagnostic instrument and vehicle is used to obtain vehicle fault code, which helps technicians to quickly locate the fault reason of vehicle by reading and analyzing the fault code (DTC) stored in ECU, so as to carry out effective maintenance.

[0003] A complete test scheme needs to cover all the diagnostic functions supported by the current ECU, including forward and reverse test cases. After the test case design is completed, the test work needs to be carried out according to the steps of the test case, but due to the lack of interaction with other test devices in the existing tool, the current test is still a traditional manual test, which is directly monitored by the tester using the test tool, manually simulating fault generation and reading the DTC code and mask of the test object, and then analyzing the data according to the demand, the overall test workload is quite large, and the whole automation execution has not been realized. UTILITY MODEL CONTENT

[0004] Based on the defects of the prior art, the utility model provides a kind of car ECU automation DTC testing arrangement, including test host, program-controlled power supply, relay, communication interface equipment, wire harness module, the test host is respectively with communication interface equipment, program-controlled power supply, relay communication connection, the program-controlled power supply is connected with ECU by wire harness module, the communication interface equipment is connected with ECU by wire harness module, the test host is connected with relay by wire harness module, and the relay is electrically connected with ECU.

[0005] Further, the test host is connected with program-controlled power supply by serial bus.

[0006] Further, the test host is connected with relay by serial bus.

[0007] Further, the test host is connected with communication interface equipment by serial bus or Ethernet.

[0008] Further, the wire harness module comprises a CAN bus, and the communication interface device is connected with the ECU through the CAN bus.

[0009] Further, the wire harness module comprises a power line, and the program-controlled power supply is connected with the ECU through the power line.

[0010] Further, the wire harness module comprises a signal line, and the test host transmits an analog test signal to the ECU through the signal line, and the signal line is connected with the ECU through a relay.

[0011] Further, the relay is a multi-channel relay, and each channel corresponds to an input / output port of the ECU.

[0012] Beneficial effects:

[0013] The technical scheme of the utility model discloses a program-controlled power supply and a relay are arranged, the test host realizes the direct control of the program-controlled power supply through a serial port communication protocol, the switch of the power supply can be adjusted, and the setting of the power supply voltage is realized. BRIEF DESCRIPTION OF DRAWINGS

[0014] The following drawings only schematically illustrate and explain the utility model, and do not limit the scope of the utility model.

[0015] Figure 1 It is the overall schematic view of an embodiment of the utility model. DETAILED DESCRIPTION

[0016] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation mode of the utility model will be described with reference to the drawings, and the same reference numerals in the drawings represent the same parts. In order to make the drawing simple, the relevant parts of the utility model are schematically represented in the drawings, but not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is schematically represented, or only one of them is marked.

[0017] In the utility model, "connection" can include direct connection, indirect connection, communication connection and electrical connection, except for special instructions.

[0018] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0019] The utility model provides a kind of automobile ECU automation DTC testing device, as shown in Figure 1 The utility model provides a kind of automobile ECU automation DTC testing device, as shown in

[0020] The utility model provides a kind of automobile ECU automation DTC testing device, as shown in

[0021] The utility model provides a kind of automobile ECU automation DTC testing device, as shown in

[0022] To complete the automatic triggering of DTC fault, the device further comprises a program-controlled power supply, a relay, a communication interface device, a wiring harness module, the wiring harness module includes a power line, the program-controlled power supply is connected with the ECU through the power line to supply power for the ECU. The test host also has a power management module, which is in communication connection with the automated test module and in communication connection with the program-controlled power supply through a serial bus, for controlling the power supply parameters of the program-controlled power supply to the measured ECU according to the test case. In this embodiment, the serial bus adopts RS-232 protocol, and the test host realizes direct control of the program-controlled power supply through RS-232 protocol, and adjusts the setting of the switch and power voltage of the program-controlled power supply, thereby controlling the working voltage of the ECU. During the test process, the power management module can preset the voltage and current according to the test case, dynamically adjust the power supply conditions, simulate different power supply scenarios, and test the response of the ECU under various power supply fluctuation conditions.

[0023] The communication interface device adopts CAN / CANFD communication equipment, and the test host is in communication connection with the communication interface device through a serial bus or Ethernet. In this embodiment, the serial bus adopts USB interface. The wiring harness module includes a CAN bus, which is a serial communication protocol widely used in the fields of automobiles and industrial automation, and is a multi-master controlled asynchronous serial communication network that allows multiple nodes to access the bus simultaneously and solves conflicts through an arbitration mechanism. It is mainly used for real-time applications and aims to solve the communication problem between electronic control units (ECUs) in vehicles. The communication interface device is connected with the ECU through the CAN bus. The UDS diagnosis module in the test host sends and receives diagnostic messages through the CAN bus protocol and checks the DTC response of the measured ECU. This module can automatically execute UDS diagnosis instructions according to the case configuration content and verify the validity and response of the message, ensuring the normal function of the measured ECU in the diagnosis mode.

[0024] The wire harness module further comprises signal lines, and an automatic test module in the test host is connected with the input end of the relay through the signal lines, and the output end of the relay is connected to the input / output pin of the ECU through the contact. The relay is a multi-channel relay, and each channel corresponds to an input / output port of the ECU. During the test, for example, the ECU to be tested is a vehicle-mounted power amplifier, the automatic test module generates an analog audio signal, and the audio signal is transmitted to the ECU through the relay via the signal lines in the wire harness module to simulate the input signal in actual work. In order to simulate the occurrence of a fault, the test host is further connected in communication with the relay through a serial bus, and in the embodiment, the serial bus adopts RS232. The test host directly connects the relay through a separate serial bus RS232 to control the state of the contact of the relay. The test host can control the contact of the relay to be disconnected to simulate a line disconnection, can connect the contacts of two channels to simulate a line short circuit, can connect the contact to a power supply to simulate a high-voltage pull-up, and can connect the contact to the ground to simulate a low-voltage pull-down. Thus, various faults of the channels of the ECU can be simulated, automatic triggering of various faults of the ECU is realized, then a fault code recorded by the ECU is read through a communication interface device, and then whether the ECU DTC fault recording function meets the expectation is judged, so that the automatic test of the ECU DTC fault recording function is realized.

[0025] The above only describes preferred embodiments of the present application, and the present application is not limited to the above embodiments. Those skilled in the art can clearly understand that the forms in the embodiments are not limited to this, and the adjustment mode is also not limited to this. It can be understood that other improvements and changes directly derived or thought of by those skilled in the art without departing from the basic concept of the present application should be considered to be within the protection scope of the present application.

Claims

1. An automated DTC testing device for automotive ECUs, characterized in that, The device includes a test host, a programmable power supply, a relay, a communication interface device, and a wiring harness module. The test host is communicatively connected to the communication interface device, the programmable power supply, and the relay. The programmable power supply is connected to the ECU via the wiring harness module. The communication interface device is communicatively connected to the ECU via the wiring harness module. The test host is communicatively connected to the relay via the wiring harness module. The relay is electrically connected to the ECU. The wiring harness module includes a CAN bus, and the communication interface device is connected to the ECU via the CAN bus. The wiring harness module includes signal lines, through which the test host transmits analog test signals to the ECU. The signal lines are connected to the ECU via relays.

2. The automated DTC testing device for automotive ECUs as described in claim 1, characterized in that, The test host is connected to the programmable power supply via a serial bus.

3. The automated DTC testing device for automotive ECUs as described in claim 1, characterized in that, The test host is connected to the relay via a serial bus.

4. The automated DTC testing device for automotive ECUs as described in claim 1, characterized in that, The test host is connected to the communication interface device via a serial bus or Ethernet.

5. The automated DTC testing device for automotive ECUs as described in claim 1, characterized in that, The wiring harness module includes a power cord, and the programmable power supply is connected to the ECU via the power cord.

6. The automated DTC testing device for automotive ECUs as described in claim 1, characterized in that, The relay is a multi-channel relay, with each channel corresponding to one input / output port of the ECU.

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