发明公开
- 专利标题： Misfire detection method
- 专利标题（中）： 用于检测熄火的方法
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申请号： EP96202166申请日： 1993-06-08
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公开(公告)号： EP0744609A3公开(公告)日： 1998-12-30
- 发明人: MATSUMOTO TAKUYA , HASHIMOTO TORU , MIYAKE MITSUHIRO , YOSHIDA YASUHISA , YANAGISAWA MITSUHIKO , NAKAJIMA HIROYUKI , NAMIKI KOICHI
- 申请人： MITSUBISHI MOTORS CORP
- 专利权人： MITSUBISHI MOTORS CORP
- 当前专利权人： MITSUBISHI MOTORS CORP
- 优先权： JP14943292 1992-06-09; JP1853693 1993-02-05
- 主分类号： F02D41/14
- IPC分类号： F02D41/14 ; G01M15/11 ; G01M15/00 ; F02D41/22
摘要：
A misfire detection method is provided. which method makes it possible to accurately detect the occurrence/absence of misfire by eliminating a detection error in misfire detection, which error is caused by a vibrational increase or decrease of the rotational changing rate of a crankshaft after a misfire state occurs, and which method does not require any special hardware for that purpose. A processor, which receives pulse outputs from a crank angle sensor. calculates in sequence angular accelerations Dω
n-2 , Dω
n-1 , Dω
n , and Dω
n+1 in crank angle areas which correspond to a preceding cylinder, two cylinders checked for misfire, and a succeeding cylinder, respectively. If the values Dω
n-1 and Dω
n significantly decrease in comparison with the values Dω
n-2 and Dω
n-1 , respectively. then it is tentatively determined that misfire has occurred in both cylinders checked. Then if the value Dω
n+1 significantly increases in comparison with the value Dω
n , then the restoration to the normal combustion state is confirmed, and the occurrence of misfire in the two cylinders checked is definitely determined.
n-2 , Dω
n-1 , Dω
n , and Dω
n+1 in crank angle areas which correspond to a preceding cylinder, two cylinders checked for misfire, and a succeeding cylinder, respectively. If the values Dω
n-1 and Dω
n significantly decrease in comparison with the values Dω
n-2 and Dω
n-1 , respectively. then it is tentatively determined that misfire has occurred in both cylinders checked. Then if the value Dω
n+1 significantly increases in comparison with the value Dω
n , then the restoration to the normal combustion state is confirmed, and the occurrence of misfire in the two cylinders checked is definitely determined.
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