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The model of a hybrid electric bus is established, including the models for vehicle longitudinal dynamics, engine, power battery, electric motors and energy management strategy. By using automatic code generation in MATLAB/Simulink, the above model for hybrid electric bus is downloaded, together with the energy management strategy, into hybrid control unit to validate the model by real bus test. The results show that the outputs of model are very close to the data of real-vehicle test, demonstrating the high accuracy of the model established, pro- viding a good base for the subsequent vehicle matching and energy management strategy optimization. [ABSTRACT FROM AUTHOR]

The vehicle control system (VCS) for a hybrid electric city bus is developed, including energy management strategy (EMS) and power coordination control (PCC). Based on the division and analysis of bus operation modes, the EMS determines the corresponding control strategy for each operation mode; while PCC uses the torque of the driving motor as compensation to realize AMT shifting without power interruption. In addition, the software of hybrid control unit (HCU) is developed using automatic code generation technology. The results of real vehicle test show that with the VCS developed, the fuel economy and power performance of the hybrid electric city bus are enhanced by around 26% and 17% respectively with emissions also improved. [ABSTRACT FROM AUTHOR]