Method and apparatus to control operation of a homogeneous...

Details Method and apparatus to control operation of a homogeneous... Method and apparatus to control operation of a homogeneous...

2008-04-22

2008-04-22

Argenbright, T. M. (Department: 3747)

Internal-combustion engines

Combustion chamber means having fuel injection only

Having a particular relationship between injection and...

C123S090150, C123S294000, C123S568210

Reexamination Certificate

active

07360523

ABSTRACT:
The invention provides a method for operating a multi-cylinder, spark-ignition, direct-injection, four-stroke internal-combustion engine adapted to operate in a controlled auto-ignition mode selectively operative at stoichiometry and lean of stoichiometry. The method comprises adapting an engine valve actuation system to control engine valve opening and closing, and monitoring engine operating conditions and ambient barometric pressure. The engine is operated unthrottled and the engine valve actuation system is controlled to effect a negative valve overlap period when the engine operating conditions are within predetermined ranges. A mass of fuel is injected during the negative valve overlap period. The magnitude of the negative valve overlap period is decreased with decreasing ambient pressure and increased with increasing ambient pressure.

REFERENCES:
patent: 6662785 (2003-12-01), Sloane et al.
patent: 6840237 (2005-01-01), Strom et al.
patent: 7000586 (2006-02-01), Kato et al.
patent: 7021277 (2006-04-01), Kuo et al.
patent: 7059296 (2006-06-01), Strom et al.

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