Caterpillar Inc.
PRE-CHAMBER IGNITION SYSTEM HAVING IGNITER WITH GAS ORIFICE STRUCTURED FOR PRE-EXPANDING OUTGOING COMBUSTION GASES

Abstract:

An ignition system for a gaseous fuel engine includes an igniter and an actuator structured to apply an actuating force to a piston within the igniter, to autoignite an ignition charge of fuel and air within the igniter. A housing of the igniter includes a gas orifice having a flow area that is increased between a combustion pre-chamber in the igniter and a main combustion chamber in the engine, to limit velocity of outgoing combustion gases to below a threshold velocity for engine mis-fire.