盛利1,刘志治1,张文1,石磊2，王俊席3*
1.广西玉柴机器股份有限公司，广西玉林537005;2.上海交通大学动力机械与工程教育部重点实验室，上海200240;3.上海海能汽车电子有限公司，上海201806
摘要：通过大量停机试验，研究不同影响因素下发动机停机时刻曲轴位置的分布规律，并对数据进行概率统计分析，研究停机过程节气门开度、发动机转速等参数对停机位置分布的影响。试验数据分析表明：停机过程中节气门开度对停机位置的分布具有显著影响，节气门开度从0开始逐渐增大，停机位置分布更加趋于集中在压缩冲程的中间区间即上止点前曲轴转角为60°~100°；当节气门开度达到或超过20%时，停机位置分布差异很小；停机前的怠速转速对停机位置分布影响不明显。
关键词：发动机起停技术；停机位置分布；停机概率
Abstract：A large number of shutdown tests are carried out to study the distribution of crankshaft position at engine shutdown time under different factors, and the probability statistical analysis of the data is employed to study the influence of throttle opening, engine speed and other parameters on the distribution of shutdown position during the stopping process. The analysis of the test data shows that the throttle has a significant effect on the distribution of the shutdown position during the shutdown process. Increasing the throttle opening from 0 will make the shutdown position distribution more concentrated in the middle of the compression stroke, that is, the crankshaft angle before top dead center is 60°~100°. However,when the throttle opening is more than 20%, the distribution difference of the shutdown position is very small; the idle speed before shutdown has no obvious effect on the distribution of shutdown position.
Keywords:startstop technology of engine;distribution of shutdown position;shutdown probability
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