Study on Multi-objective coordination and optimization control method for hybrid bus with dual-planetary structure

摘要

In order to make the new full hybrid electric bus with new dual-planetary structure work smooth and stable, this paper presents a multi-objective coordination and optimization control method. Firstly, this paper analyzed the dual-planetary system structural constraints and each subsystem non-ideal characteristic constraints. Then the realization method of the control system process was determined with the hybrid system optimization control objectives. In view of the three control objectives, a coordination and optimization control method on the command change rate and way was put forwards. The method was based on the efficiency first principle in order to get high fuel economy for the bus. Meanwhile, consideration was also given to the dynamic performance and comfort in the optimization process. For the regulation of the engine working points, the fuzzy PI control and dynamic amplitude limit method on the generator torque were introduced. At the same time, the engine start/stop logical condition and start/stop methods were studied especially, which effect on the fuel economy of the bus largely for the hybrid electric vehicle. The realization process of the control method was described in detail. Parts of experimental data and vast statistic data show that the busses have fantastic fuel economy and dynamic performance compared to the conventional counterpart, and the ride comfort is also improved. The results indicate the feasibility and effectiveness of the proposed control method in this paper.