Design and control of Thermal Management System for Fuel Cell vehicle in Low-temperature Environment 2020-01-0851
In low-temperature environment, heat supply requires considerable energy, which significantly increases the energy consumption and shortens the mileage of electric vehicles. In fuel cell vehicles, waste heat generated by fuel cell systems can supply heat for vehicles. In this paper, a thermal management system is designed for a fuel cell interurban bus. Heat exchange between fuel cell cooling system and vehicle heat supply system is realized and controlled by heat exchange and coolant flow path design. System model is developed, consisting of vehicle and powertrain model, fuel cell cooling system model, cabin heat supply model and vehicle heat dissipation models. In order to control the temperature of fuel cell stack and vehicle cabin at proper value and minimize the energy consumption, a thermal management strategy is proposed. Simulation of thermal management system and control strategy at -20℃ ambient temperature is conducted based on AMESim and Matlab/Simulink co-simulation. Results show that in fast startup mode, fuel cell temperature and cabin temperature reach target values in 280s and 400s respectively. After startup process, Errors of the fuel cell stack and cabin temperatures are within 0.13℃ and 2 ℃ respectively. Energy flow of the studied vehicle and thermal management system is then analyzed. Fuel cell system can provide about 46% energy of maximum heat requirement. Total energy consumption in one C-WTVC driving cycle is reduced by near 20%, comparing to traditional solution with heat supply by electric heater.