CN210041853U

CN210041853U - Automatic test system for automobile CAN/LIN bus

Info

Publication number: CN210041853U
Application number: CN201921240223.XU
Authority: CN
Inventors: 张登
Original assignee: Shanghai Yi Xing Electronic Technology Co Ltd
Current assignee: Shanghai Yi Xing Electronic Technology Co Ltd
Priority date: 2019-08-01
Filing date: 2019-08-01
Publication date: 2020-02-07
Anticipated expiration: 2029-08-01

Abstract

An automotive CAN/LIN bus automated testing system comprising: the system comprises an upper computer, a programmable power supply, bus monitoring and control equipment, a VT system, an oscilloscope, a universal meter, a tested ECU, a connector assembly and bus on-off control equipment, wherein the upper computer is used for running an automatic test program and completing test contents by controlling the programmable power supply, the VT system, the oscilloscope and the universal meter; the bus monitoring and controlling equipment determines whether to process the received bus message and send the message to the CAN/LIN bus according to the instruction of the upper computer; the VT system controls the ECU power supply and whether the oscilloscope and the universal meter are connected to the test bus or not according to the instruction of the upper computer; the upper computer is also used for comparing the communication message transmission condition of the bus monitoring and control equipment with the pre-stored judgment condition to judge whether the corresponding function of the tested ECU meets the requirement of the test specification. The test system has high automation degree, can greatly save labor cost and improve test efficiency and precision.

Description

Automatic test system for automobile CAN/LIN bus

Technical Field

The utility model relates to a bus automation test system especially relates to a car CAN LIN bus automation test system of vehicle technical field.

Background

In the CAN/LIN bus, CAN, which is called "Controller Area Network" as a Controller Area Network, was developed by Bosch in germany in the beginning of the 20 th century, 80 th, as a serial communication bus defined by ISO, and the communication medium thereof may be twisted pair, coaxial cable, or optical fiber. In the same year, the Bosch company has formally promulgated a CAN technical specification, version 2.0. the CAN is designed to be used as a microcontroller for communication in an automobile environment, and a single chip microcomputer is used as a direct control unit for directly controlling a sensor and an execution part and exchanging information between control units (ECUs) of vehicle-mounted electricity to form an automobile electronic control network. LIN, known as Local Interconnect Network, is a distributed new low-cost serial communication bus used in automobiles, and is used as an auxiliary Network or sub-Network of a CAN bus, and is specially used for low-end systems. At present, the CAN/LIN bus has wide application in the field of automobile electronics.

With the development of network technology, people increasingly diversify the functional requirements of automobiles. In order to meet the requirements of customers and realize complex control functions, more and more ECU and network bus technologies with new functions are applied to automobiles, the currently applied network bus is mainly a CAN/LIN bus of an automobile electronic control unit, a large amount of data transmission of the whole automobile is completed by the CAN/LIN bus of the automobile electronic control unit, and the CAN/LIN bus bears a large amount of data and control information, so that the whole automobile function is realized.

Due to the diversification of functions, the number of the ECUs in the automobile is increased, the interaction of network bus signals is more and more complicated, and the bus of the ECU and signals on the bus need to be tested before the sample automobile is manufactured so as to ensure that the ECU meets the requirements of an OEM manufacturer. The current method mainly adopts a bus analysis tool produced by Vector company to perform manual test. The main problems existing at present are that the manual test efficiency is low in the face of a large number of ECUs to be tested of the whole vehicle, the precision cannot be guaranteed through the manual test for test contents with high precision operation requirements, and manual intervention tests can cause small labor consumption and various possible errors.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a car CAN LIN bus automation test system, this test system includes: the system comprises an upper computer, a programmable power supply, bus monitoring and control equipment, a VT system, an oscilloscope, a universal meter, a tested ECU, a connector assembly and bus on-off control equipment, wherein the upper computer is used for running an automatic test program and completing test contents by controlling the programmable power supply, the VT system, the oscilloscope and the universal meter; the program control power supply correspondingly outputs the variable value to the VT system according to the setting of the variable value in the upper computer; the bus monitoring and controlling equipment determines whether to process the received bus message and send the message to the CAN/LIN bus according to the instruction of the upper computer; the VT system controls the ECU power supply, the oscilloscope and the universal meter to be connected to the test bus or not according to the instruction of the upper computer; the oscilloscope obtains bus message waveform data according to the instruction of the upper computer, and the bus message waveform data is used for analysis and processing by the upper computer; the universal meter is used for measuring the bus resistance and providing data to the upper computer; the bus on-off control equipment controls the connection and disconnection of a certain tested ECU and the CAN/LIN bus according to the instruction of the upper computer; and the upper computer is also used for comparing the communication message transmission condition of the bus monitoring and control equipment with the pre-stored judgment condition to judge whether the corresponding function of the tested ECU meets the requirement of the test specification.

Preferably, the oscilloscope is of the type Picoscope 5444B.

Preferably, the multimeter is of the type Fluke 8845A.

Preferably, the model of the programmable power supply is EA PSI 9040-40.

Preferably, the model of the VT system is VT8102, VT7001 and VT2848 of Vector company.

Preferably, the tested ECU and the bus on-off control equipment are both provided with a plurality of devices.

The technical scheme of the utility model beneficial effect who brings does:

the utility model discloses an degree of automation is high, writes corresponding equipment among the test script control system through the host computer, obtains ECU's relevant data and compares with the judgement condition of prestore, judges whether the corresponding function of ECU accords with OEM test specification requirement to the test procedure and the requirement that describe in the test specification are accurately carried out automatically fast, and the saving human cost that can be very big can greatly improve efficiency of software testing and precision.

Through each equipment among the host computer control system, the simulation process environment is rack test environment, consequently CAN get rid of the interference of other environmental factor to the system, the utility model discloses a to the earlier stage test of CAN LIN bus, CAN carry out the polling test of all ECU of whole car of automation, efficiency of software and precision are high, CAN avoid artificial manual test's the rate of accuracy not high and software and hardware such as later stage change ECU that cause lead to high change expense, CAN shorten the development cycle of whole car, reduce whole car development cost.

Drawings

Fig. 1 is a schematic diagram of the structure and connection relationship of an automatic testing system for a CAN/LIN bus of an automobile according to the present invention.

Wherein the drawings are described as follows:

the system comprises an upper computer 1, a programmable power supply 2, a VT system 3, an oscilloscope 4, bus monitoring and control equipment 5, a universal meter 6, an ECU7, bus on-off control equipment 8 and a connector 9.

The above-mentioned drawings use and carry out supplementary explanation to the technical scheme of the utility model to help clearly understand the utility model. However, the drawings are not intended to limit the present invention. Furthermore, the contents of the drawings are not to scale and should not be interpreted as limiting the invention. The whole or the constituent parts of the contents shown in the drawings can be combined and changed based on the technology of the art.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined purpose, the following description of preferred embodiments is made with reference to the accompanying drawings, and the detailed description, structural features and technical effects of an automatic testing system for a CAN/LIN bus of an automobile according to the present invention are as follows.

Referring to fig. 1, the present invention provides an automatic testing system for a CAN/LIN bus of an automobile, comprising: the device comprises an upper computer 1, a programmable power supply 2, a VT system 3, an oscilloscope 4Picoscope5444B, a bus monitoring and controlling device 5, a multimeter 6Fluke8845A, a plurality of tested ECUs 7, a connector 9 and a bus on-off controlling device 8.

The upper computer 1 is connected with the programmable power supply 2, the oscilloscope 4, the bus monitoring and control device 5 and the universal meter 6 through USB data lines, is used for controlling the voltage output of the programmable power supply 2 to be used for supplying power to the ECU7, is used for setting the oscilloscope 4 to configure and acquiring data of the oscilloscope 4, is used for acquiring and sending messages through the bus monitoring and control device 5 and is used for setting the universal meter 6 to configure and acquiring data of the universal meter 6; the upper computer 1 is connected with the VT system 3 through a network cable and is used for controlling whether the oscilloscope 4, the bus monitoring and controlling equipment 5 and the universal meter 6 are connected with the bus or not; the bus on-off control device 8 is connected with the ECU7 and is used for controlling whether the ECU7 is connected to the bus for testing, wherein the ECU7 is a vehicle-related controller unit.

Therefore, all relevant controller units on the whole automobile are accessed into the bus test system, the upper computer 1 is used for compiling and executing an automatic test program, relevant test items of the automobile controller units are carried out by controlling the programmable power supply 2, the VT system 3, the oscilloscope 4, the bus monitoring and control equipment 5, the universal meter 6 and the bus on-off control equipment 8, whether the ECU7 passes the test or not is judged by comparing the sent command and the obtained data with judgment indexes specified in the specification, and the upper computer 1 carries out automatic test on all the automobile controller units by controlling the on-off of the bus on-off control equipment 8 according to a preset execution sequence.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An automotive CAN/LIN bus automated test system, the test system comprising: an upper computer, a program control power supply, a bus monitoring and controlling device, a VT system, an oscilloscope, a multimeter, an ECU to be tested, a connector and a bus on-off controlling device,

the upper computer is used for running an automatic test program and completing test contents by controlling the programmable power supply, the VT system, the oscilloscope and the universal meter; the program control power supply correspondingly outputs the variable value to the VT system according to the setting of the variable value in the upper computer; the bus monitoring and controlling equipment determines whether to process the received bus message and send the message to the CAN/LIN bus according to the instruction of the upper computer; the VT system controls the ECU power supply, the oscilloscope and the universal meter to be connected to the test bus or not according to the instruction of the upper computer; the oscilloscope obtains bus message waveform data according to the instruction of the upper computer, and the bus message waveform data is used for analysis and processing by the upper computer; the universal meter is used for measuring the bus resistance and providing data to the upper computer; the bus on-off control equipment controls the connection and disconnection of a certain tested ECU and the CAN/LIN bus according to the instruction of the upper computer; and the upper computer is also used for comparing the communication message transmission condition of the bus monitoring and control equipment with the pre-stored judgment condition to judge whether the corresponding function of the tested ECU meets the requirement of the test specification.

2. The bus automation test system of claim 1 wherein the oscilloscope is of the Picoscope model 5444B.

3. The bus automation test system of claim 1 wherein the multimeter is model number Fluke 8845A.

4. The bus automation test system of claim 1 wherein the model of the programmed power supply is EAPSI 9040-40.

5. The bus automation test system of claim 1 wherein the model number of the VT system is VT8102, VT7001, VT2848 from Vector corporation.

6. The bus automated test system of any of claims 1-5, wherein the ECU under test and the bus on-off control device are each in plurality.