Study On Design And Control Of Vehicle Fuel Cell System

With the continuous development of new energy technologies,proton exchange membrane fuel cells have become the mainstream of fuel cell development due to their pollution-free,stable and reliable operation,short cold start time and high efficiency [1].Proton exchange membrane fuel cells(PEMFC)will be applied to the automotive industry in the future.This paper mainly studied the design and control of fuel cell,for fuel cell system,using the existing equipment to the maximum output efficiency plays an important role,therefore,this paper designs the automobile fuel battery,fuel cell simulink system model is established,and set the fuel cell system test bench,designed a set of work condition of the fuel cell start-stop control,and influence the electric reactor power output larger air way and electric reactor cooling water temperature control optimization in order to achieve the best output state.The main contents are as follows:This paper firstly introduces the research status of proton exchange membrane fuel cell for vehicle,and the structure,function,working principle and working mode of fuel cell engine.Secondly,several components of the vehicle fuel cell system were modeled by simulink.Based on thermodynamics,the input-output characteristics of the air compressor and three polarization phenomena of the fuel cell reactor were analyzed.The simulink model of the whole vehicle fuel cell system was established by establishing the models of the intake and return gas pipelines and the material consumption model of the fuel cell.And then,doing the simulation of the simulink model,imitate the actual pile test loading in the simulation process test,namely to input a DCDC target current value,after the operation can output a series of related parameters in the model output end,for example,DCDC input voltage,air compressor power as well as the anode and cathode pressure parameters such as temperature and electric pile of work.In addition,the current loading test is carried out and the relevant simulation results are obtained.For the construction of the experimental bench,then introduced some of the equipmentused parameters,and to control the process of fuel cell operation,analysis and design of a heap,closed stack strategy.in addition,also for decoupling,air way mainly to remove air pressure and air flow rate of the two coupling relationship,the diagonal matrix decoupling method was adopted.Then,fuzzy PID was used to control and optimize the temperature of the fuel cell system and the flow rate of the air compressor.Some experimental results were obtained through the bench test,which verified the practicability of the above control methods and completed the research on the design and control of the vehicle fuel cell system.