| Increasingly environment and energy problems urge Electric Vehicle (EV) undergo a development apex. Because battery and other energy device can not absolutely take place internal-combustion engine, 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.An on-board running data acquisition and analysis system based on virtual instrument is developed according to the characteristics of HEV. In this thesis, the writer confirms the necessary running data according to the factors that affect HEV's dynamical and economic performance. The source signals of this system comes from two means, one is the signals of sensors and secondary instruments, the other is to acquire 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 interface circuit, signal processing unit and sensors, CAN receive unit based on PCMCIA CAN card, accomplish and carry out all functions of the system. The signals of sensors and secondary instruments will be saved in a 64M memorizer of FP-2010. We can also saved the data in PC when we have a statistic and analysis the acquired data online.The programme language of the system is LabVIEW, a popular graphics-language at present. The running data acquisition and analysis system can choose parameters of the vehicle that you are about to measure, also you can modify the frequency of sampling. The difficulty of the system is attribute to the real-time communication of FP and PC, the synchronization of CAN signals and FP signals, how to use hardware timing to measure frequency by counter when measure rotate speed, how to calculate measured data at a given time and analysis acquired data after measure.The system can carry out the function of running data's acquisition and save. Combined with pc, we can achieve real-time display, statistic, calculate acquiring data online at a given time and analysis memorized data after finishing measure.The system shows characters of stability, good anti-jamming, high precision and sampling frequency in the application to hybrid electric bus data acquisition. It alsohas a friendly use interface, and very convenience to operation, embodying the advantage of virtual instrument, and it will facilitate to the research and development of HEV with all these merits. |
