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

摘要： 文章基于一辆搭载增压发动机的整车进行轻型汽车测试循环的能量流试验，确定整车 能量利用与损耗的分布，分析损耗原因及潜在优化方向。应用 GT-Suite 软件平台搭建整车系 统仿真模型，用能量流测试数据对模型进行校核，优化能耗，降低世界新型车测试循环油耗。 依据仿真优化方案对实车整改，验证节油效果。结果表明，通过优化标定策略、改善冷却水 路与油路循环和优化起燃过程能够降低未燃化学能损失、换热损失和排气能量损失，使轻型 汽车测试循环油耗降低了 3.68%。此外，还使发动机冷却水温达到平衡温度的时间缩短了 73 s， 且变速器油温显著升高。

关键词: 能量流分析；轻型汽车测试循环；油耗