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The traditional energy management algorithm is mainly based on a single driving cycle, it is obvious that many factors might be often neglected by designer, such as different driving cycles would suit for different control strategies. But they tend to make decisions on the balance of torque distribution and battery power that based on a single driving cycle. Therefore, it is very difficult to achieve the optimal control in each case. In this paper we introduce a new design concept of Multi-operating mode energy management, a mathematical model of the energy management applied to a hybrid vehicle system is presented. Results of simulations using the model with the Multi-operating mode energy management were compared with results of simulations using a model with the single mode energy management, allowing the energy efficiency evaluation of the proposed energy management system.

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.

The goal of Military HEV Program organized by military industry is to develop a hybrid electric military bus prototype, which achieves higher fuel economy than that of conventional bus running in city. Moreover, it can be used as civil public transit bus. The series configuration of power train is employed for hybrid electric military vehicle. The energy management strategy and control algorithm is presented, which can control the output of engine and motor to satisfy the requirement of propelling power, regulate engine operation points within high efficient area, and maintain SOC at reasonable level without charging outside. Method and assessment criteria of parametric design for series HEV power train is presented to determine specification of power train targeting higher fuel economy. Based on the energy management strategy and parametric design the development of control system and integration of HEV power train.

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.