Method and apparatus for controlling combustion mode...

Details Method and apparatus for controlling combustion mode... Method and apparatus for controlling combustion mode...

2011-06-28

2011-06-28

Solis, Erick (Department: 3747)

Internal-combustion engines

Combustion chamber means having fuel injection only

Having a particular relationship between injection and...

C123S295000

Reexamination Certificate

active

07966991

ABSTRACT:
An internal combustion engine is operative in a spark ignition combustion mode and a controlled auto-ignition combustion mode. Operating the engine includes commanding a transition from a first combustion mode to a second combustion mode. A change in openings and closings of the intake and exhaust valves is commanded to a preferred duration of a negative valve overlap period corresponding to operating in the second combustion mode. Fuel injection parameters and spark ignition events are adjusted to effect operation in the second combustion mode only when a realized duration of the negative valve overlap period exceeds a predetermined threshold.

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