发明名称 |
Multi-cylinder engine combustion state diagnosis apparatus and method. |
摘要 |
<p>A prescribed threshold level Dth for misfire judgment for each cylinder is recorded in a misfire judgment level retaining means 102 of a misfire judgment processing section 100. A combustion state parameter operation means 106 measures revolution speed of a multi-cylinder engine for each cylinder, and attains as a combustion state parameter a differential in revolution speed between a specific cylinder and other cylinders. In a misfire judgment level correction means 104, a plurality of combustion state parameters concerning the specific cylinder is attained, and the above-mentioned threshold level Dth is corrected as a function of the parameter. A misfire judgment processing means 108 compares the combustion state parameter with the threshold level Dth and diagnoses a combustion state in the specific cylinder. Namely, the corresponding cylinder is judged to be misfire when the combustion state parameter of the specific cylinder exceeds the prescribed parameter. <IMAGE></p> |
申请公布号 |
EP0655616(A2) |
申请公布日期 |
1995.05.31 |
申请号 |
EP19940118786 |
申请日期 |
1994.11.29 |
申请人 |
HITACHI, LTD. |
发明人 |
KASHIMURA, YUICHI;TAKAKU, YUTAKA;ISHII, TOSHIO |
分类号 |
G01M15/04;F02B77/08;F02D45/00;F02P17/12;G01M15/11;(IPC1-7):G01M15/00 |
主分类号 |
G01M15/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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