Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2007-02-20
2007-02-20
Kwon, John T. (Department: 3747)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S321000, C123S347000
Reexamination Certificate
active
11248251
ABSTRACT:
An ECU calculates an engine speed for calculating a camshaft phase based on a time period Tθ in which a crankshaft rotates a sampling angle θ. The camshaft phase is derived from a time difference between output timing of a cam angle signal and output timing of a crank angle signal based on the engine speed. According as the engine speed is lower, the sampling angle θ becomes small, so that the engine speed and the camshaft phase are precisely calculated.
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Izumi Kazunari
Urushihata Haruyuki
Denso Corporation
Kwon John T.
Nixon & Vanderhye P.C.
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