Design And Study Of Fuel Cell Hydraulic Hybrid Bus Power System

Under the severe energy crisis and air environmental pollution, the research and application of new energy automobile has become the key point in the automobile industries all over the world. Combining the high energy-density of fuel cell engine and the high power-density and the high energy storage cycle efficiency of the hydraulic accumulator in this paper, it is possible that this method will accommodate the power demand when experiencing complicate road and frequently speeding up and braking,etc.At first, the requirement of the driving performance of hybrid power bus is analyzed. And the structure of dynamic driving system is confirmed by combining the respectively aspects of fuel cell engine and hydraulic accumulator. At the same time every part of power system and parameters are determined. According to the operating principal of each sub-system of the bus, the paper builds forward simulation model for fuel cell engine, driving motors, hydraulic accumulator and oil hydraulic pump by ways of MATLAB/Simulink. According to the characteristics of the fuel cell hydraulic hybrid system,the fuel cell energy management strategy of hydraulic hybrid system based on the dynamic energy charging and exoergicing coefficient is put forward,which realize the reasonable distribution of the counter rotating moment in the process of vehicle.Finally,the desingned hydraulic hybrid fuel cell system and energy management strategy are analyzed and verified through the simulation experiment.