| Hybrid Electric Vehicle(HEV) has been rapidly developed in recent years as a new kind of automobile technology.In many universities and large automobile enterprises,a great deal of attentions has been paid to it because of its effect on reducing automobile consumption and emissions.Both at home and abroad many researches have done in HEV,and some foreign enterprises have industrialized already.Some domestic enterprises also achieved small batch production,but there are still many problems should be solved.Theoretical research and experimental analysis of HEV's power system have done in this paper.Firstly,the characteristics of mild commercial parallel hybrid electrical vehicle and three typical control strategies were analyzed in this paper.Considering the characteristics of the structure and the operation mode of the HEV,the torque distribute strategy were designed. The vehicle's demand torque was distributed to gasoline engine and ISG motor properly, which makes the engine run in high efficient area.Then,the power system model of the functional HEV was built in AVL/CRUISE.And the control system model was built in MatLab/Simulink,which was composed of drive torque compute model,vehicle run mode model,power battery management model and torque distribute model.The control system model and the power system model were simulated in combined situation.The dynamic performance and fuel economy were analyzed with the result of simulation.Finally,the control system model was downloaded into dSPACE's RCP(Rapid Control Prototype) hardware.And the control system debugging,bench test and road test were accomplished.The results show that the control system performed well.The design performances of power and fuel economy were achieved.With the above work,the functional HEV's control system simulation and experiment were finished.The HEV's power system developing process was established and some supports that offered for the future research were got from the results of this paper. |
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