Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2006-11-07
2006-11-07
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
C073S116070, C073S117020, C123S406200
Reexamination Certificate
active
07133766
ABSTRACT:
A rotation angle sensor detects the rotation speed of a crankshaft of an engine. An ECU extracts a first frequency component synchronized with combustion cycles of the engine that is contained in a rotation speed signal obtained by the detection of the rotation angle sensor, and a second frequency component having a higher frequency than the first frequency component. It detects a combustion state by using the rotation variation amount of the first frequency component in a lower rotation range than a specified engine speed, and by using the rotation variation amount of the second frequency component in a higher rotation range.
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Denso Corporation
Nixon & Vanderhye P.C.
Vo Hieu T.
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