- 专利标题: Knock determining apparatus for internal combustion engine
- 专利标题(中): 内燃机爆震判定装置
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申请号: US11302318申请日: 2005-12-14
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公开(公告)号: US20060129304A1公开(公告)日: 2006-06-15
- 发明人: Yuichi Takemura , Rihito Kaneko , Kenji Kasashima
- 申请人: Yuichi Takemura , Rihito Kaneko , Kenji Kasashima
- 申请人地址: JP Kariya-city JP Toyota-city
- 专利权人: DENSO CORPORATION,TOYOTA JIDOSHA KABUSHIKI KAISHA
- 当前专利权人: DENSO CORPORATION,TOYOTA JIDOSHA KABUSHIKI KAISHA
- 当前专利权人地址: JP Kariya-city JP Toyota-city
- 优先权: JP2004-361063 20041214
- 主分类号: G01L23/22
- IPC分类号: G01L23/22 ; F02P5/152
摘要:
For each predetermined crank angular interval, an output of a knock sensor is separated into a plurality of frequency components through a plurality of band-pass filters, and peak values of each frequency component are extracted. Then, a mean and a variance of the peak values are computed for each frequency component. A maximum one of the computed means is selected, and the corresponding frequency component, which is associated with the maximum mean, is selected. It is then determined whether the noise is present based on a ratio between the variance of the selected frequency component and the corresponding mean. If the noise is detected in any of the frequency components, execution of knock determination may be prohibited, or ignition timing feedback control according to a result of the knock determination may be prohibited, or ignition timing may be corrected by retarding the ignition timing.
公开/授权文献
- US07181338B2 Knock determining apparatus for internal combustion engine 公开/授权日:2007-02-20