Control for determining a firing timing of an...

Details Control for determining a firing timing of an... Control for determining a firing timing of an...

2011-03-22

2011-03-22

Kwon, John T (Department: 3747)

Internal-combustion engines

Spark ignition timing control

C123S406410

Reexamination Certificate

active

07909018

ABSTRACT:
A control for determining a firing timing of an engine is provided. An in-cylinder pressure is detected at a predetermined time interval. An in-cylinder pressure for every predetermined crank angle is calculated based on the detected in-cylinder pressure. A motoring pressure in a case where combustion is not performed in the engine is estimated. It is detected that a pressure difference between the calculated in-cylinder pressure and the motoring pressure has exceeded a determination value. A time point is identified, as a firing timing, at which the pressure difference has exceeded a determination value with a finer resolution than the resolution of the predetermined crank angle interval through an interpolation calculation. The interpolation calculation uses a first crank angle when it is detected that the pressure difference has exceeded the determination value, the pressure difference corresponding to the first crank angle, a second crank angle previous to the first crank angle by the predetermined crank angle and a pressure difference corresponding to the second crank angle.

REFERENCES:
patent: 7238133 (2007-07-01), Tabata et al.
patent: 7552003 (2009-06-01), Suzuki et al.
patent: 2004/0035622 (2004-02-01), Ito et al.
patent: 2005/0005914 (2005-01-01), Tamechika et al.
patent: 2000-234558 (2000-08-01), None
patent: 2005-076484 (2005-03-01), None
patent: 2006-242146 (2006-09-01), None

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