Experiment Evaluation And Simulation Technique On Energy Utilizing Of Hybrid Electric Vehicle

Hybrid Electric Vehicle, utilizing engine and electromotor as power, was importantresearch direction to solve the problem of auto environment and energy sources, and hadbetter industrialization foreground than other Electric Vehicle. In the paper, control strategysimulation and experiment evaluation technique of Hybrid Electric Vehicle wasinvestigated.Control strategy optimization was the key technique of Hybrid Electric Vehicle, whiledriving cycle has important role on control strategy optimization and experimentevaluation of Hybrid Electric Vehicle. A testing system based on data stream function wasdeveloped to test the city bus driving cycle. By measuring such parameters as engine speed,throttle position, vehicle speed and passenger number, statistic results indicated thatparking time, vehicle speed, acceleration, deceleration and passenger number accordedwith normal school. Three control strategy of Parallel Hybrid Electric Vehicle wereinvestigated, electric assistant control strategy, adaptive control strategy and fuzzy controlstrategy. An optimal torque of engine was achieved firsly in fuzzy control strategy. Thenactual output torque of engine was achieved considering about control state restriction andelectrmotor character. And the overall optimization on fuel consumption and emission ofvchicle was finally achieved. The three control strategy was compared by simulationmethod, and analysis result indicated that fuzzy control strategy had more effect on improving fuel economy and emission of HEV.Regenerative braking was a key technique of HEV, its control strategy optimizationand evaluation of regenerative rate became important. In the paper, Proportionoptimization of regenerative braking and machine braking was investigated, and constantproportion strategy and dynamic proportion strategy was compared. Simulation analysisresults in several different driving cycle indicated that brake force proportion, energyfeedback mode and state of charge had direct influence, and with more brake course in adriving cycle, rgenerative braking has more potantial on energy reclaim.Some key technique research results of HEV were achieved based on simulation, suchas control strategy optimization and rgenerative braking, which need experiment evaluation.Then the development of evaluation test-bed became important. Power assemblyevaluation test-bed of HEV based on Controller Area Network was investigated. Control system research was finished, such as main controller of power assembly, electricaccelerograph controller, simulation driving desk, CAN communication supervisingsystem, code automatism creation of simulation mode based on MATLAB, and so on.Chassis dynamometer of HEV based on Controller Area Network was investigated. Directcurrent motor was selected as the load equipment, and its control model was established.Electric simulation formula of driving resistance was achieved to realize simulation ofdriving resistance on chassis dynamometer. Test and control system was investigated.Energy utilizing experiment evaluation technique of Hybrid Electric Vehicle wasinvestigated. By the experiment on the road and chassis dynamometer, test means of fuelconsumption, influence factor and evaluation of regenerative energy were incestigated.Wattmeter was used to test current and voltage of battery, and electric energy variety wasachieved by integral means. CanMoniter was used to test state of charge of battery. Theinfluence of state of charge of battery on fuel consumption was analysed, result indicatedthat the relation between fuel consumption and net energy Q was linearity. Fuelconsumption could be achieved by the linearity while Q equal zero. Considering aboutelectric waste factor, two correct means was adopted, one was C equity means, and theother was charge accumulative means. In six deceleration cycle of NEDC, regenerativecurrent was test on road and chassis dynamometer separately. Experiment results indicatedthat chassis dynamometer can be used to test fuel consumption of HEV for the reason thatthere was little difference between two methods. At the end, experiment evaluationtechnique of regenerative braking ratewas investigated, which provides a effective tool forthe research of control strategy optimization...