电动汽车热泵 PTC 耦合制热策略研究

In order to decrease the power consumption for EV heating, it is proposed that there are heating performance zones for heat pump system heating within the ambient temperature range of -20 to 5℃ based on the heating performance test of the heat pump system. The PTC coupling heating strategy of the heat pump with PTC involving in the low efficiency zone in advance is developed. The system model built by AMESim is used for simulation and the comparison study is conducted with the traditional strategy. Compared with the heat pump with 6 000 r/min rotary speed coupling 278.95 W PTC heating power, the heat pump with 4 700 r/min rotary speed coupling 462.11 W PTC heating power consumes 6.4% less energy to maintain the car temperature at 24 ℃。Compared with single heat pump heating, the heat pump coupling PTC heating strategy with PTC intervention in advance has the advantages of faster heating, lower energy consumption and lower rotary speed. When the ambient temperature is -10 ℃ and the target temperature in the vehicle is 20 ℃, the energy consumption in the regulation process can be reduced by 9.4% at most and by 2.8% after stabilization. When the strategy with PTC intervention in advance is adopted, the compressor speed should be maintained as close to the critical speed in the high efficiency zone as possible. The strategy can significantly improve the heating efficiency and comfort without changing the system structure.