Research On Integrated Thermal Management System Of Proton Exchange Membrane Fuel Cell Vehicle

In order to deal with the increasingly severe energy and environmental problems,various countries have put forward the goal of carbon peak and carbon neutrality and formulated corresponding plans.As the timeline of carbon neutrality targets becomes more and more clear,in the process of realizing carbon neutrality targets gradually,the world’s major automotive enterprises have developed fuel cell vehicles(FCV)and achieved breakthroughs in the research of fuel cell vehicle technology.But there are still some problems in applying the technology to practice.Apart from high manufacturing and operating costs,the independent and decentralized characteristics of the fuel cell thermal management subsystem make the energy consumption of the thermal management system high,and the impact on the vehicle economy can not be ignored.Therefore,to further improve the economy and thermal management effect,it is also the focus and difficulty of current research to design a great fuel cell integrated thermal management system and develop fuel cell vehicle energy management strategy combined with thermal management.Therefore,this paper establishes a complete integrated thermal management model for fuel cell vehicles firstly,then focuses on the performance of the integrated thermal management system,and develops a strategy to minimize the equivalent hydrogen consumption of fuel cell vehicles integrating thermal management and battery SOC.The specific content is as follows:(1)The principle and thermal characteristics of heat pump air conditioning system are analyzed in the first place.In this paper,the heat pump air-conditioning system’s composition and principle are analyzed,and the cabin’s thermal load is studied by combining the structural parameters and environmental temperature parameters of the research object.Based on the working principle and heat exchange process of fuel cell,power battery and motor electrical system,the corresponding temperature characteristics of the battery and motor are obtained.As a result,it provides a theoretical basis for subsequent vehicle integrated thermal management system design and modeling.(2)Propose the integrated heat management scheme of the vehicle and model the key components.In view of the structure of the thermal management system of fuel cell vehicles,the functions and temperature control objectives of each subsystem are determined,After that,the cooling and heating schemes of the integrated thermal management system are designed and the working status and pipeline design of system components under different working modes are clarified.Furthermore,model is conducted according to the working mechanism of key components in the thermal management system.As a consequence,it provides a model basis for the follow-up analysis of the rationality and efficiency of the integrated thermal management system.(3)Design the corresponding control strategy for the key components of the vehicle integrated thermal management system,and design the vehicle equivalent hydrogen consumption minimum algorithm integrating thermal management and battery SOC.Firstly,the control strategy of key components in the vehicle integrated thermal management system is introduced,and then the equivalent factor adaptive adjustment method considering fuel cell temperature is proposed for the optimization control of fuel cell vehicle thermal management and energy management.In order to minimize the vehicle equivalent hydrogen consumption,the rational power distribution of the power system is realized.(4)Simulation verification of fuel cell vehicle integrated thermal management system and energy management strategy.Based on the thermal management system model and the corresponding component control strategy,the thermal management system is tested and analyzed at different temperatures to verify the rationality and efficiency of the proposed scheme.At the same time,the vehicle equivalent hydrogen consumption minimization algorithm which integrates thermal management and battery SOC is compared with the algorithm which does not consider thermal management.