Wang Junxi

Research on SOC estimated strategy of Ni/MH battery used for hybrid electric vehicle

On the basis of the pulse charge and discharge characters of the nickel-metal hydrogen battery (Ni/MH) used for hybrid electric vehicle (HEV), a real-time and dynamic SOC estimated strategy of Ni/MH battery is presented in this paper. The initial SOC of the battery is determined by the historical factors and the current status together and the internal resistance of the battery is taken into account. Then the SOC of the battery is jointly calculated by the coulomb-accumulation contribution and open-circuit-voltage contribution based on the modified RC model, in which the efficiency of charge and discharge and the transient effects of the battery are considered. Finally, the validity of the SOC estimate strategy is tested by experiments, the results shows a great accuracy of SOC estimated by the new method, which is fit for the request of the HEV well.

Operation coordinated control for a dual electric machines hybrid electric bus

A dual electric machines hybrid electric bus is investigated in this paper. The mechanical clutch and the manual transmission fixed in a conventional bus are replaced by dual electric machines in the novel system, which work as an electromagnetic clutch and a continuously variable transmission simultaneously. The basic operation coordinated control for the system components is implemented to satisfy the driverpsilas power demand and ensure smooth power transfer. Moreover, the improved operation coordinated control is suggested to avoid engine rich fuel injection and improve fuel economy. Results show that the operation coordinated control can achieve prospective target.