Measuring and testing – Engine detonation – Specific type of detonation sensor
Reexamination Certificate
2005-04-15
2008-03-25
Williams, Hezron (Department: 2856)
Measuring and testing
Engine detonation
Specific type of detonation sensor
Reexamination Certificate
active
07347081
ABSTRACT:
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.
REFERENCES:
patent: 4289102 (1981-09-01), Katsumata et al.
patent: 4312214 (1982-01-01), Kramer et al.
patent: 4345558 (1982-08-01), Yamaguchi et al.
patent: 4425891 (1984-01-01), Kashimura et al.
patent: 4508079 (1985-04-01), Komurasaki et al.
patent: 4558674 (1985-12-01), Okado et al.
patent: 5121729 (1992-06-01), Hashimoto et al.
patent: 5190011 (1993-03-01), Hashimoto et al.
patent: 5460031 (1995-10-01), Fujishita et al.
patent: 5598822 (1997-02-01), Fujishita et al.
patent: 6234146 (2001-05-01), Tanaya et al.
patent: 6246953 (2001-06-01), Quinn et al.
patent: 6439029 (2002-08-01), Asano et al.
patent: 6591660 (2003-07-01), Franke et al.
patent: 6748922 (2004-06-01), Uchida et al.
patent: 6947829 (2005-09-01), Honda
patent: 2001/0011204 (2001-08-01), Tomo et al.
patent: 2004/0204814 (2004-10-01), Honda
patent: 2006/0129303 (2006-06-01), Sauler et al.
patent: 1310293 (1995-08-01), None
patent: 1322295 (2001-11-01), None
patent: 6-41151 (1989-01-01), None
patent: 2002-47993 (2002-02-01), None
European Search Report for Appln. No. 05008323.7-2213 issued Aug. 25, 2006.
Chinese Office Action, Appln. No. 2005100646096 issued Jan. 12, 2007.
Inoue Masaomi
Kaneko Rihito
Kasashima Kenji
Masuda Satoshi
Takemura Yuichi
Denso Corporation
Toyota Jidosha & Kabushiki Kaisha
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