基于曲轴扭振信息识别的柴油机失火气缸判别方法  

Judgment of Diesel Engine Misfire Cylinders Based on Crankshaft Torsional Vibration Detection

作　　者：谭治学 刘翀 梁健星 杨新达 解同鹏 梁博强 TAN Zhixue;LIU Chong;LIANG Jianxing;YANG Xinda;XIE Tongpeng;LIANG Boqiang(R&D Center,Weichai Power Co.,Ltd.,Weifang 261041,China)

机构地区：[1]潍柴动力股份有限公司发动机研究院,潍坊261041

出　　处：《内燃机工程》2020年第2期70-76,共7页Chinese Internal Combustion Engine Engineering

基　　金：国家重点研发计划课题(2016YFD0700705)。

摘　　要：为解决柴油发动机在高转速、低负荷工况下难以准确判断出发生失火故障的气缸的问题,提出了通过检测曲轴转速信号中的扭振信号起始点来判定失火气缸的故障诊断方法。该方法首先通过分析单缸失火时的转速信号以确定曲轴扭振的自由频率,然后基于该频率构造正弦检测信号,将该检测信号与各缸做功转角范围内的转速信号做内积运算,并得到的内积值作为失火气缸的指示特征。在6缸柴油机上的失火试验证明该方法能够在高转速低负荷情况下准确识别发动机的单缸失火和两缸失火,弥补了传统失火诊断方法工况覆盖率低的不足。To handle the difficulty of judging fault cylinders in diesel engine misfire failure under high speed and low load conditions,a method that locates fault cylinders by detecting the start of crankshaft torsional vibration in rotation speed signal was proposed.With analyzing the rotation speed signal pattern in single-cylinder misfire,this method first determined the natural frequency of crankshaft torsional vibration,through which a sine vibration detecting signal was built.Then,the inner product of the detecting signal and speed signal during the working stroke of each cylinder was calculated and used as the indicator of fault cylinder.The proposed method was proven by a misfire experiment on a six-cylinder diesel engine to be able to diagnose with high accuracy single-cylinder and doublecylinder misfire faults under high speed and low load conditions,extending the diagnosing scope that the conventional methods cannot cover.

关 键 词：柴油机 失火诊断 转速信号 曲轴扭振 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]