Simulation And Experimental Analysis Of Thermal Management Control Strategy For Pure Electric Vehicle

Pure electric vehicles have the advantages of low cost,low noise,and no pollution.The industry has developed rapidly in recent years.However,due to its shortcomings such as insufficient cruising range and low energy efficiency ratio(COP),the promotion of pure electric vehicles is hindered.Pure electric vehicles cannot use engine waste heat to heat the cockpit like fuel vehicles.If electric heaters(PTC)are used for heating,the cruising range will be greatly reduced.Moreover,when pure electric vehicles are running,the battery will generate a lot of heat.Without good treatment,the discharge rate and life of the battery will be affected in serious cases,which will lead to danger.Therefore,in response to the above problems,it is urgent to develop a new-architecture high COP and high cruising range pure electric vehicle thermal management system.The thermal management system of pure electric vehicles can not only meet the temperature requirements of the cockpit,but also maintain the stability of the battery operating temperature.Therefore,the thermal management system is of great significance to the development of pure electric vehicles.Based on the research on the thermal management system of pure electric vehicles,the specific work content and results are as follows: First,the factors affecting the performance of the thermal management system are studied,and a waste heat recovery architecture that combines the heat pump air conditioning circuit and the battery circuit is proposed.The scheme can recover the waste heat in the battery,increase the range of the tram and cool the battery;a heat pump air-conditioning system based on fuzzy control is designed to realize the control of the compressor speed and the opening of the electronic expansion valve,and When the vehicle is low in power,the compressor speed is limited,which increases the range of the electric car.A battery air-cooling system based on PID control is designed to realize the control of battery cooling when the temperature is too high.A simulation model and an experimental model were built to verify the proposed theory and scheme.A pure electric vehicle simulation model is built in AMESim software,and a control algorithm model is built in MATLAB/Simulink.After two UDDS cycle conditions are jointly simulated by AMESim and Simulink,the thermal management system control designed in this paper is analyzed according to the simulation results.The impact of the strategy on the vehicle.Finally,through the selection of system related components and measurement equipment and the matching of related parameters,a thermal management experiment bench was built,and experiments on the influence of electronic expansion valves and waste heat recovery on the system were carried out in the experiment cabin,and the results were analyzed in detail.The feasibility and effectiveness of the scheme are verified through comparison and analysis of power battery temperature experiment and cockpit temperature rise/drop experiment and simulation.