Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2005-09-20
2005-09-20
Vo, Hieu T. (Department: 3747)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
C073S035010, C123S406380
Reexamination Certificate
active
06947829
ABSTRACT:
An apparatus is provided for detecting an occurrence of knocking of an engine from a signal sensed by a knocking sensor for the engine. The apparatus comprises plural filters extracting, from the signal, plural signal components whose frequency bands mutually differ and a unit determining whether or not there is the occurrence of knocking, based on results outputted from the plural filters. The plural filters include first and second types of filters. The first type of filter has a pass band set to a specific frequency band including a specific frequency of the signal. This specific frequency indicates the occurrence of knocking. The second type of filter has a pass band set to another specific frequency band. An inclination of a filtering characteristic of the second type of filter at a cut-off frequency thereof is steeper than that the first type of filter.
REFERENCES:
patent: 5190011 (1993-03-01), Hashimoto et al.
patent: 5996398 (1999-12-01), Schleupen et al.
patent: 6289720 (2001-09-01), Ohkubo et al.
patent: 58-28646 (1983-02-01), None
patent: 60-82931 (1985-05-01), None
patent: 5-26721 (1993-02-01), None
patent: 7-109949 (1995-04-01), None
patent: 7-293314 (1995-11-01), None
patent: 2001-164982 (2001-06-01), None
“Design of IIR Filter” by H. Ochi; Digital Signal Processing Learned Through Simulation; Jul. 1, 2001; pp., 92-96 (W/partial English translation).
Denso Corporation
Nixon & Vanderhye P.C.
Vo Hieu T.
LandOfFree
Apparatus for detecting knocking of internal combustion does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for detecting knocking of internal combustion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for detecting knocking of internal combustion will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3436916