The Research Of Auxiliary Power Unit System Controller For Range Extended Electric Vehicle

Auto industry is one of the pillar industry in the national economy of China.Nowadays, energy shortage and environmental pollution are the most seriousproblems against the sustainable development of Chinese auto industry. Rangeextended electric vehicle is a kind of new energy vehicle, which uses internalcombustion engine and storage battery as power sources. By optimizing thecontrol of the energy distribution between engine and electric machine, it isensured that engine can work in high-performance areas to achieve the purposesof reducing fuel consumption and emissions. Auxiliary power unit control systemplays an essential role in guaranteeing the reliability of the whole range extendedelectric vehicle. Thus, the mode and the strategy of the control system havebecome the urgent needs to resolve in the process of research on range extendedelectric vehicle.First of all, this thesis introduces and analyses operation principle andcharacteristics of APU. The control system adopts combination control mode andbased on ant colony neural network control strategy, according to above analysis.Then, simulation experiments was studied by using of Matlab/Simulink. Theresults showed the validity and feasibility of the designed control mode andstrategy in theory.Secondly, the thesis states how to choose the type of key components forAPU control system, brought forward the major parameters of powertrain.Afterwards, the APU controller has been accomplished both in haedware andsoftware based on16-bit microcontroller. In addition, further improvement andperfection have also been accomplished based on the subsequent experiment.This paper proceeded some related bench trial and commissioning trial, includinggenerator tests, system tests and vehicle tests. The trial results prove the control mode and strategy of control system are effctive and feasible.Finally, for practical needs, the trial monitoring system was developed. Themajor function of this monitoring system contained display working status ofAPU, storage data and manage startstop opertion. The system is more flexiableand exercisable, the trail also becomes more safety because of this monitoringsystem. From the results of the trail, the APU control system fulfill the initialdesign requirements, realized each control function basically, established a solidfoundation for the system further optimization and perfection.