Internal-combustion engines – Spark ignition timing control – Electronic control
Reexamination Certificate
2008-05-13
2008-05-13
Wolfe, Jr., Willis R. (Department: 3747)
Internal-combustion engines
Spark ignition timing control
Electronic control
C123S406590
Reexamination Certificate
active
07370634
ABSTRACT:
A method for controlling spark timing in an internal combustion engine. The method includes determining, in response to a knock sensor mounted to the engine, a spark offset to the scheduled spark timing for the engine at relatively low engine speed which is applied to the scheduled spark timing at relatively high engine speeds. This offset is applied in conjunction with a time-varying spark retardation bias. The offset is removed at a rate proportional to the time varying spark retard bias. The bias increases if either a relatively large torque is demanded from the engine or the engine is at the relatively high speed and relatively high air charge condition; otherwise, the bias is decreased with time.
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Christman Anthony
Fabien Philip
Ford Global Technologies LLC
Wolfe, Jr. Willis R.
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