发明授权
- 专利标题: Variable valve lift mechanism fault detection systems and methods
- 专利标题(中): 可变气门升程机构故障检测系统及方法
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申请号: US13024726申请日: 2011-02-10
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公开(公告)号: US08612124B2公开(公告)日: 2013-12-17
- 发明人: Julian R. Verdejo , Kenneth J. Buslepp , Nicholas John Kalweit
- 申请人: Julian R. Verdejo , Kenneth J. Buslepp , Nicholas John Kalweit
- 专利权人: GM Global Technology Operations LLC
- 当前专利权人: GM Global Technology Operations LLC
- 主分类号: F02D13/02
- IPC分类号: F02D13/02 ; F02D13/00
摘要:
A system for a vehicle includes a filtering module, an indicated mean effective pressure (IMEP) determination module, and a stuck mechanism indicator module. The filtering module generates engine speeds based on positions of teeth of a toothed wheel that rotates with a crankshaft and based on a crankshaft position signal generated by a crankshaft position sensor. The IMEP determination module determines an IMEP for a combustion cycle of a cylinder of an engine based on squares of first and second ones of the engine speeds during the combustion cycle. The stuck mechanism indicator module selectively diagnoses a fault in a variable valve lift (VVL) mechanism of the cylinder based on the IMEP.