Abstract: The foreign and domestic research status on driving conditions was analyzed and the function and composition of chassis dynamometer system were introduced and then the concepts of energy consumption, energy state and energy utilization ratio were proposed. According to the driving distance of vehicle under the acceleration, deceleration, uniform and idle speed conditions and the free driving distance, the different energy utilization ratio models were established and applied to the driving conditions in China. Moreover, the chassis dynamometer system was used to simulate actual driving conditions on road and measure the sliding distances of various speeds, thereby the free driving distance of corresponding speed was obtained and the energy utilization ratio under driving conditions in our country was calculated. The research results show that energy isn’t in full use.

Key words: vehicle engineering;chassis dynamometer, driving condition, energy utilization ratio, energy consumption, sliding distance

摘要： 分析了国内外行驶工况的研究现状，介绍了底盘测功机系统的功能和组成，提出了能耗、能态、能量利用率的概念，根据车辆在加速、减速、匀速、怠速等各种工况下的行驶距离及自由行驶距离建立了多种能量利用率模型，并将此模型针对我国行驶工况进行研究。利用底盘测功机模拟道路实际工况测出各种速度的滑行距离，从而获得相应速度的自由行驶距离，计算出车辆在我国行驶工况下的能量利用率。研究表明，能量没有被充分利用。

关键词: 车辆工程, 底盘测功机, 行驶工况, 能量利用率, 能耗, 滑行