System and method for direct injection of gaseous fuel into...

Details System and method for direct injection of gaseous fuel into... System and method for direct injection of gaseous fuel into...

2006-10-10

2006-10-10

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S295000

Reexamination Certificate

active

07117830

ABSTRACT:
A method for an engine capable of burning gaseous fuel, the engine also including a combustion chamber, at least one intake valve, and at least one exhaust valve, an injector to directly inject pressurized gaseous fuel into the combustion chamber, and a variable valve timing system coupled to the intake valves and exhaust valves, the method comprising closing the exhaust valve before top dead center of piston position to increase combustion chamber pressure achieved at top dead center and to trap exhaust gas in the cylinder; and starting injection of a gaseous fuel directly into the combustion chamber after the exhaust valve is closed and before the intake valve is opened.

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