Measuring and testing – Internal combustion engine or related engine system or... – Irregular combustion
Reexamination Certificate
2007-10-19
2009-11-10
Caputo, Lisa M (Department: 2855)
Measuring and testing
Internal combustion engine or related engine system or...
Irregular combustion
Reexamination Certificate
active
07614289
ABSTRACT:
A control apparatus for an internal combustion engine can detect knocking of the engine even when an extraction frequency band is switched in accordance with an operating state of the engine. The apparatus includes a knock sensor for detecting vibrations generated in the engine and outputting a vibration detection signal, a rotation sensor for detecting the engine operating state, a SCF circuit for extracting a signal of a specific frequency band from the vibration detection signal and outputting an extracted vibration signal, a filter frequency switching section for switching an extraction frequency band of the filter section in accordance with the engine operating state, and a knocking detection section for detecting knocking of the engine based on the extracted vibration signal. The filter frequency switching section inhibits switching of the extraction frequency band until a switching inhibition period elapses after the switching of the extraction frequency band.
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Furuta Akira
Kobayashi Hiroyuki
Miyaji Hidetoshi
Yamashita Manabu
Caputo Lisa M
Kirkland, III Freddie
Mitsubishi Electric Corporation
Sughrue & Mion, PLLC
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