关键词: 低温能耗；电驱能耗；电机余热利用；低温能量流

Abstract: In order to study the main factors leading to the deterioration of power consumption under low temperature environment, the energy consumption of various components of China light-duty vehicle test cycle passenger car (CLTC-P) under normal temperature (23 ℃) and low temperature (-7 ℃) is measured by the energy flow analysis method of the vehicle. The test results show that the main components of energy consumption difference between low temperature and normal temperature are electric drive, compressor, low pressure fan, blower, water pump, etc. The increase of compressor and electric drive consumption accounts for a large proportion, so the focus is on analyzing the reasons for the deterioration of low-temperature electric drive, and the theoretical analysis of the reasons for the deterioration of low-temperature electric drive energy consumption are the deterioration of low-temperature chassis resistance, the increase of low-temperature electric drive lubricating oil viscosity, and the deterioration of motor efficiency. In order to verify the influence of lubricating oil temperature on electric drive power consumption, the electric drive oil temperature is controlled by the flow rate of electric drive pump, and the power consumption is tested under low temperature CLTC-P condition. In order to verify the energy consumption difference between the low temperature electric drive waste heat pump system and self-heating electric drive oil temperature, the electric drive power consumption, compressor power consumption and electric drive oil temperature are recorded simultaneously during the experiment. The experimental results show that the total power consumption of electric drive waste heat self-heating oil temperature is better.

Key words: Low temperature power consumption; Electric drive power consumption; Motor waste heat recovery; Low temperature energy flow