关键词: 能量流分析；轻型汽车测试循环；油耗

Abstract: Energy flow test under the world light vehicle test cycle was carried out on a vehicle equipped with a turbocharged engine to determine distribution of vehicle energy utilization and loss. This paper analysed the reason of the energy loss and found the potential optimized direction. The simulation model of the whole vehicle model was built based on GT-Suite software and the model was checked on the energy flow test data. The model was used to optimize energy loss and reduced the world light vehicle test cycle fuel consumption. Evaluated oil-saving effect by executing optimum proposal. The results show that unburned chemical energy loss, heat exchange loss and exhaust loss can be reduced by means of optimized calibration strategy, improved engine cooling water or engine oil circulation loop and optimized ignition process, and then the world light vehicle test cycle fuel consumption was reduced by up to 3.68%. Moreover, the time of the engine cooling water temperature up to equilibrium temperature was shortened by up to 73 seconds and increased the transmission oil temperature obviously.

Key words: Energy flow analysis; WLTC cycle; Fuel consumption