Research on Control Strategy of Electric Vehicle Heat Pump Air Conditioning System in Low Temperature Environment

Most electric vehicle air conditioners use Positive Temperature Coefficient (PTC)or heat pump to make heat in low temperature environment, but high PTC power consumption will affect the mileage of electric vehicle. Heat pump in low temperature environment, low heating efficiency, can not meet the need of heating time. This text under low temperature environment, heat pump and PTC mixed heating mode are adopted to solve the problem of high PTC power consumption and low heating efficiency of heat pump. The actual working condition verification shows that when the environment temperature is between −10°C~-5°C, the heating time of heat pump and PTC mixing mode is shortened by 2 minutes compared with that of single heat pump, and the heating effect meets the demand. Heat pump and PTC mixing mode save about 7.1% energy compared with single heating.