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In this paper, the practical configuration of power train for a series hybrid electric transit bus (HETB) is introduced. Based on the analysis of the operation modes, the energy management strategy has been developed, which can operate the engine, generator and motor within its highly efficient range as much as possible and keep the battery state of charge (SOC) at reasonable level. The parameters of the power unit (included engine, generator, motor, battery, transmission) are calculated and discussed in details according to the vehicle requirements for maximum cruising speed, acceleration time, grade ability, and fuel efficiency. The simulation results show that, this transit bus would have comparable performance with corresponding conventional one, much better fuel economy, and a unlimited range by the battery storage energy.

In this paper, the practical configuration of a power train for a parallel hybrid electric family sedan (HEFS) is introduced. Based on the analysis of the operation modes, an energy management strategy has been developed which can operate the engine within its high-efficiency range as much as possible and keep the battery state of charge (SOC) at a reasonable level. The components of the power unit (including engine, electric motor, battery, transmission and torque coupler) are calculated and discussed in detail according to the vehicle requirements for maximum cruising speed, acceleration time, gradeability, emission, and fuel efficiency. The simulation results show that the sedan would have performance comparable to that of a corresponding conventional sedan, about twice the fuel economy, and a range not limited by the battery storage energy.

In this paper, the practical configuration of power train for fuel cell family sedan (FCFS) is introduced. Based on the analysis of the operation modes, the energy management strategy has been developed, which can operate the fuel cell and motor within its highly efficient range as much as possible and keep the battery state of charge (SOC) at reasonable level. The parameters of the power unit (included fuel cell, motor, battery, transmission) are calculated and discussed in details according to the vehicle requirements for maximum cruising speed, acceleration time, grade ability, and fuel efficiency. The simulation results show that, this family sedan would have comparable performance with corresponding conventional one, much better fuel economy, and a unlimited range by the battery storage energy.

In this paper, the series configuration of fuel cell hybrid transit bus is introduced. The control strategy and control algorithm is presented, in which to achieve higher fuel economy fuel cell pack can be modified by battery SOC within high efficient area and battery SOC can be maintained at reasonable level. Method and assessment criteria of parametric design are presented, by which appropriate parameters of fuel cell, motor, transmission are determined. The simulation results show that, with developed control algorithm and parametric design comparable power performance and much higher fuel economy can be achieved than that of baseline bus. Based on these results the concept design of fuel cell hybrid transit bus had been accomplished and development of prototype is now conducing.