Simulation Of Thermal Management System For Hydrogen Fuel Cell Vehicles

Around the world new energy vehicles are developing dramatically.In the future transportation,hydrogen fuel cell vehicles are regarded as the most promising renewable energy vehicles.One of the core of hydrogen fuel cell vehicles is the hydrogen fuel cell system,which can convert hydrogen energy into electricity with the advantages of low operating temperature,high energy density,and nearly zero pollution,so its research has become hot in various countries.However,the performance of hydrogen fuel cell system is affected by many factors,among which the temperature is particularly critical,and the performance is also greatly affected by the temperature of each key component.Therefore,it is very important to design an efficient,feasible,and,stable thermal management system by combining optimal energy control strategy.In this thesis,the thermal management system is designed for a certain type of fuel cell vehicle,and its power system is "hydrogen fuel cell&lithium battery" in parallel mode.By analyzing the thermal load of the vehicle,the integrated thermal management system is designed by considering the thermal management of the crew cabin,power battery,motor and fuel cell.Commercially available software AMEsim is used to build up the model for the vehicle,the thermal management strategy is developed on the basis of the energy distribution strategy,and then the strategy module is built with simulink.Finally,the vehicle model is verified by the combined simulation through AMEsim and Simulink.In this thesis,the operationof fuel cell vehicle is simulated under different working conditions,including normal temperature environment,high temperature environment,low temperature environment and cold start-up process.The temperature variation of the reactor is analyzed,as well as the temperature variation of the coolant at the inlet and outlet of the reactor,the opening of the thermostat.The temperature variation of the crew cabin is simulated under different ambient temperatures.The results show that with the control strategy the temperature of the hydrogen fuel cell can be controlled at 70-80℃,and the temperature difference between the inlet and outlet of the stack is also within a reasonable range.The fast cold start-up process can be achieved in a low temperature environment.The heat pump air conditioning system can control the temperature of the crew cabin in a reasonable range and achieve good cooling or heating performance for the crew cabin under high temperature environment or low temperature environment.The results show that the integrated thermal management system of fuel cell vehicle is reasonable in the control of stack and cabin temperature,and also provides a guideline for the subsequent design of the vehicle integrated thermal management system.