发明授权
- 专利标题: Knock detecting apparatus and method for internal combustion engine
- 专利标题(中): 内燃机爆震检测装置及方法
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申请号: US11106546申请日: 2005-04-15
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公开(公告)号: US07347081B2公开(公告)日: 2008-03-25
- 发明人: Masaomi Inoue , Yuichi Takemura , Satoshi Masuda , Kenji Kasashima , Rihito Kaneko
- 申请人: Masaomi Inoue , Yuichi Takemura , Satoshi Masuda , Kenji Kasashima , Rihito Kaneko
- 申请人地址: JP Toyota-shi JP Kariya-shi
- 专利权人: Toyota Jidosha Kabushiki Kaisha,Denso Corporation
- 当前专利权人: Toyota Jidosha Kabushiki Kaisha,Denso Corporation
- 当前专利权人地址: JP Toyota-shi JP Kariya-shi
- 代理机构: Kenyon & Kenyon LLP
- 优先权: JP2004-119849 20040415
- 主分类号: G01L23/22
- IPC分类号: G01L23/22
摘要:
The signal levels of vibration waveform signals outputted by knock sensors are extracted at a filter processing section for each of a plurality of frequency bands. The mean value of the signal levels in the frequency bands at a point in time when variation of the signal levels in the frequency bands is minimum computed, and the mean value is detected as a background level. A knock characteristic parameter, which represents the characteristics of knock, is computed based on the extracted signal levels in the frequency bands. The knock characteristic parameter is compared with the background level to obtain a knock intensity. If the knock intensity is equal to or greater than a knock determination value, it is determined that knock that exceeds a permissible level is occurring. If the knock intensity is less than the knock determination value, it is determined that knock that exceeds the permissible level is not occurring. This configuration permits the background level of the output of the knock sensors to be accurately detected without being influenced by knock or noise.