Abstract:

In the actual operation of fuel cell hybrid electric vehicles, the air conditioning system provides a comfortable environment for drivers and passengers. However, the operation effect of the air conditioning system interacts with the energy distribution of the actual operation of the vehicle, so it is necessary to consider the air conditioning system into the energy management strategy, and design an energy management strategy that takes into account the hydrogen consumption economy of the vehicle while meeting the comfort requirements of the cabin temperature. Firstly, based on the vehicle dynamics model, the heat balance equation is used to establish the heat pump air-conditioning system model and heat load model. Then, the dual delay depth deterministic strategy gradient (TD3-PER) algorithm combining the double Q network and the depth deterministic strategy gradient is used to establish the energy management strategy considering the energy consumption of the air conditioning system and the vehicle operation demand. Finally, the simulation results under typical NEDC working conditions show that the air conditioning system under the TD3-PER energy management strategy can rapidly reach and maintain the cabin temperature within a comfortable range of 22℃ to 26℃ within 100 seconds, satisfying the cooling/heating effect and ensuring the cabin temperature comfort, which verifies the feasibility of the TD3-PER energy management strategy when considering the air conditioning system. In cooling/heating of air conditioning system, the strategy based on TD3-PER algorithm can prolong the service life of fuel cell and battery compared with the strategy based on the traditional depth Deterministic strategy gradient (DDPG) algorithm, and improve the economy of hydrogen consumption in cooling/heating by 2.59% and 3.58%, respectively. It is verified that the energy management strategy based on TD3-PER algorithm has more advantages than the traditional algorithm in reducing hydrogen consumption and improving vehicle economy.

Key words: dual-energy fuel cell vehicle, air conditioning system, energy management strategy, TD3-PER, DDPG