Research On The Energy Management Strategy Of Parallel Hybrid Electric Vehicle

Facing to the press of energy shortage and environment protection, along with the high treasure to new energy of our government,hybrid electric vehicles are generally recognized and widely used. The energy allocation strategy is the core of the new energy hybrid electric vehicles. Energy allocation strategy can achieve a reasonable distribution of engine torque and motor torque, so that the vehicle has excellent dynamic performance and economic.Based on the driving priority, maintenance of the battery charge and the maximum braking energy recovery principles, design the distribution of engine torque and motor torque under different operating modes by studying the existing energy strategy.Meanwhile, the use conditions and perform actions of other parts are analyzed specifically.It discusses the conformity between allocation strategy and other components.In this paper,a plug-in hybrid electric bus is treated as the prototype, a Simulink model is built to analyze the rationality of energy allocation strategy.This paper designs the energy allocation strategy based on logic threshold control strategy and the instantaneous optimization strategy based on logic threshold. And the strategy in the model is converted to code using automatic code generation technology.Then the code is embedded in the hybrid control unit. It discusses the principle of code generation simply and completed the code embedded in the vehicle control process. It illustrates the basic control flow of the hybrid control unit. Meanwhile,the function is enabled and the line calibration strategy of the threshold is composed.In this paper, the feasibility and rationality of the energy allocation strategy is verified by DSPACE and actual vehicle road test. The vehicle actual operating results and the simulation results were compared to see the differences. The parameters is amended to make it closer to the actual vehicle operating effects. Proven, energy allocation strategy designed can be used normally in the real car. And, parameters are designed reasonable.And then, its economy based on vehicle operating data is analyzed. Finally, the vehicle energy saving effects it may achieve will be calculated. By automatic code generationtechnology, the workload of software engineers is greatly reduced.