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ABSTRACT

For the sake of decreasing the fuel consume, emissions , and the green house effect of the world , hybrid electric vehicle has become a hot point of big car companys. The control strategy of a hybrid electric vehicle good or bad decides a car?ˉs fuel economy and emissions level. The control strategy decides the power distribution in the engine, the motor and the generator, it?ˉs the key to realize the low fuel consume, low emission of a hybrid electric vehicle.
Compared to the conventional vehicle, Hybrid Electric Vehicle(HEV) has a lot of kinds and combination ways of power sources in the drivetrain, According to the driving conditions, HEV determines the ideal combined way of the vehicle?ˉs engine and motor, ensures that the engine (main power input) work in the high fuel economy area and that the vehicle has high fuel economy, low emission and good driving performance.
This text analysises the overall situation control strategy with real-time control method. Based on the experiments of engine, motor and battery, the numerical of each power assembly was accomplished through analyzing the test data. And then we will know the torque?ˉs or the engine?ˉs speed?ˉs relationship between the engine ang motor. Finally the operation modes of HEV are analyzed. With real-time control establishes a parallel hybrid vehicle to spread to transmission system to drive work condition of comprehensive efficiency calculation model, with moment system's efficiency tallest for the target put forward excellent turn a control strategy, get a result and carries on analysis to the result. At last we will get the best control strategy mechod by comparing with the different results of simulation.


keywords: hybrid electric vehicle, control strategy, optimal control, real time optimization




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