Development Of Hybrid Electric Vehicle On-board Data Acquisition And Analysis System Based On Virtual Instrument

Virtual instrument (VI) is the product of modern computer technique, instrument technique and other new technique. The users can define and design their VIs which have functions of measuring according to the specific demand with the help of computer, basic hardwares and programming technologies.Hybrid Electric Vehicle (HEV) is a good compromising solution to fuel economic and exhaust of the vehicle, and is becoming the strategic point of auto industry in 21th century. It can not only improve the economics and emission of vehicle, but also promote the development of energy technology, control strategy and means of control. In this thesis, an on-board running data acquisition and analysis system based on virtual instrument is developed according to the characteristics of HEV. The system has two sources of signals, one is the signals from sensors and secondary instruments and the other is the running data of engine and motor from the CAN interface.The core processing hardware of the system, NI-FP-2010 of America National Instrument company, combined with the I/O modules, signal processing unit and sensors. And CAN receive unit on TI LF2407A DSP system accomplish acquisition of CAN messages. All the data will be saved in a 64M memorizer of FP-2010. We can also saved the data in PC when we have a statistics and analysis on the acquired data online.The software of this system is accomplished with the most popular graphic language Lab View and C. The data acquired from CAN bus is processed in DSP system and transmitted to FP-2010 through RS232. And the sending program running in DSP is wrote with C language, the receiving program running in FP-2010 is wrote with Lab VIEW. The system bring forward the communication scheme of upper layer and bottom layer. The upper layer is in charge of Real-time display of running data and bottom layer is in charge of acquiring and storing of running data. The two layers communicate through ethernet network with TCP technology. The Real-Time FIFO VIs are used to share and transmit data between programs running in bottom layer.The system can carry out the function of acquisition and storage of running data without upper layer. Combined with upper layer, we can also achieve real-time display, statistic, calculating of acquired data online at a given time.The system shows characters of stability, good anti-jamming, high precision and sampling frequency in the application to hybrid electric bus data acquisition. It also has a friendly user interface and convenience of operation. Embodying the advantage of virtual instrument it will facilitate to the research and development of HEV with all these merits.