| Energy shortage, Environmental pollution, global warming are the common challenges facing the automotive industry, and the traditional internal combustion engine vehicles cannot meet the needs of sustainable development of society. So the new energy vehicles have become an inevitable choice for automobile development, for this, the world is driving a revolution in automotive industry. Recently, America focus on plug-in hybrid electric vehicle for solving the problem of battery's low energy density and short driving range, and this is an effective way to attain zero-emission in the city.This paper was based on the special funds of Guangdong's strategic new industries, research a plug-in hybrid electric vehicle. By analyzing a variety of hybrid electric vehicle power system structure, comparing the various advantages and disadvantages of hybrid systems, finally selected four-wheel parallel structure for the plug-in hybrid electric vehicle.According to the design requirements, combining with the basic theory of vehicle dynamics, choose the type of engine, motor and battery for the plug-in hybrid vehicle, and design their parameters, and finally got the vehicle powertrain and driveline parameters. Then on the software MATLAB / SIMULINK platform, basing on the hybrid simulation software ADVISOR established the models of low-powered engine, permanent magnet synchronous motor, lithium ion battery and transmission. In the hybrid simulation software ADVISOR, the thesis did a secondary development, and builded a four-wheel drive model. For parallel hybrid electric vehicle control strategy, this paper researched electric auxiliary control strategy, adaptive control strategy and fuzzy logic control strategy, analysed the five drive modes of electric auxiliary control strategy, and designed an optimal control strategy based on it, make it more suitable for the design of this plug-in hybrid electric vehicle.From the simulation result, it could be seen that vehicle dynamic performance and fuel economy can meet the design requirements. The matching engine, motor and battery work in good condition, mostly are in the best efficiency zone. At the same time, through the control strategy, some goals such as proper power distribution, start and stop of engine and motor, brake energy recovery could be fully realized, and ensure that the battery state of charge is always maintained in the best area. Besides, the selection of the battery's capacity could meet the demand of driving range. |
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