Research And Development Of Test System For Electric Vehicle Control Unit Based On LabVIEW

As an important trend of modern automotive industry, the developing of pure electricvehicle provides a way to solve such problems like energy shortage and environmentalcontamination. Test technology aiming at the pure electric vehicle control unit (VCU) is oneof the key technologies and builds a more effective and intelligence platform to ensure thequality of the VCU and optimize the control strategy.In this paper, a test platform base on LabVIEW, data acquisition system (DAS) anddSPACE, a real time simulation system, is built to test the hardware interface of the VCUand evaluate the control strategy. The test system has been verified through the real VCUand pure electric bus which are provided from JiLin High-tech Electric Vehicle Co. Ltd. Themain contents include the following parts:(1) Analyze the hardware performance and the control strategy’s composition of pureelectric vehicle control unit, then formulate the hardware functional requirements of testsystem based on the hardware performance of VCU and design the development program oftest system combined with the characteristics of vehicle control strategy. Analyze thestrengths and weaknesses of various development softwares, and determine the tool of thesystem software. According to test functional requirements for the control strategy, chooseReal-time hardware emulation system to simulate the control object of measured controller.(2) According to the hardware characteristics of VCU, design the development programof the test system’s hardware. The Module of test system hardware is divided according tois divided according to the hardware components. The first, finish the design of dataacquisition system and implement the interaction between the test software and controllersignal. The Second, select the supply of controller power to meet the control requirement ofthe supply on voltage and current. The third, design the signal conditioning modules by addsignal conditioning board between the test system and VCU, according to the level featuresof input/output port of VCU, and complete digital signal conditioning and analog signalconditioning circuit design. Finally, design self checking program and self checking board topromise the accuracy and reliability of test system.(3) Design the test processes and software overall structure of host computer software of test system. Respectively design the software system layer, presentation layer, andapplication layer and data layer combined with the test System functional requirements. Thedevelopment of system layer completes the drives of the data acquisition card andprogrammable power. In the development of presentation layer realize interaction betweenusers with the software and design of system interface. In the development of applicationlayer respectively complete the function of self-test system, system configuration, functionaltest, logic test, case test and test report generation. In the development of data layer designthe preservation of the data and realize preservation of the test result.(4) Integrate and debug hardware and software of the test system. Debug and calibratethe hardware modules and software features of the test system performance. In order toensure the accuracy and reliability of the test system, modify and correct the existenceof error.(5) Design the pilot program of test the system. Select VCU of GX2009062816BEVfrom JiLin High-tech Electric Vehicle Co. Ltd. as the measured object and utilize the pureelectric bus of CCQ6750EV1as the carrier of the controller. Pilots required to completeverification of all the features of the test system, including System self-test, functionaltest, logic test and case test. Prove the test system is able to complete the test on thehardware performance and control strategies of VCU.