The Research of Multistage Control Strategy for DCT Plug-in Hybrid Electric System

In order to improve the energy consumption cost of Plug-in Hybrid Electric Vehicles (PHEV), the multistage control strategy was formulated. Firstly, the demand torque percent was calculated by the characteristic curve of the power train system. Secondly, the gear-shift schedule of charge deleting (CD) and charge sustain (CS) phase were formulated for the target of dynamic. Lastly, the torque distribution of engine and motor was calculated by using of instantaneous optimization algorithm for the target of the minimum energy consumption cost. Simulation evaluation of PHEV energy consumption economy were conducted based on the MATLAB/SIMULINK platform. The results indicate that control strategy keep the engine operation points within the peak efficiency region and reduce the energy consumption cost by 28.6%. 35.9%. 26.5 under NEDC, UDDS and HWFET cycle conditions, compared with prototype vehicle.