Research on Modeling and Control of Fuel Cell Vehicle Integrated Thermal Management System

The heat pump system has the advantages of high heating efficiency and low energy consumption and is more and more widely used in vehicles. In order to improve the economy and thermal management effect, this article introduces the heat pump system into the fuel cell vehicle thermal management system, designs the fuel cell vehicle integrated thermal management system (VITMS), and conducts research. First, the temperature control objectives of each subsystem are determined, the refrigeration and heating schemes of the integrated thermal management system are designed, and the working state and pipeline design of system components under different working modes are clarified. Then the modeling is carried out according to the working mechanism of the key components in the thermal management system and the corresponding control strategy is proposed for the key components in the VITMS. The simulation tests of the thermal management system at different temperatures are carried out to verify the rationality and efficiency of the established scheme and the influence of different heating methods on vehicle economy is compared. The simulation results show that the proposed VITMS can make the temperature of the passenger compartment reach and maintain the target temperature range in a short time in both high-temperature and low-temperature environments. Compared with positive temperature coefficient (PTC) heating, the economy is improved by 20.9% when the heat pump system is used for heating without the fuel cell waste heat recovery. And the economy is improved by 25.5% when the heat pump system is used for heating and the fuel cell waste heat recovery is adopted.