Abstract: The present invention provides a system that controls the amount and timing of pilot fuel injection to obtain minimum NOx and UHC emissions. The system senses if combustion occurs, when combustion occurs, and/or the quality of combustion in the combustion chamber of each cylinder of the gaseous fuel engine and adjusts the amount and/or timing of the pilot fuel injected. The minimum amount of pilot fuel needed to ignite gaseous fuel in a combustion chamber is determined and injected into the prechamber or the combustion chamber of the engine. The actual start of combustion location is determined and the injection timing is adjusted if the start of combustion location is not approximately equal to a desired location. The amount of pilot fuel or injection timing is adjusted if a knock or a misfire has occurred or if the combustion quality measure is not approximately equal to a desired quality measure.

Abstract: The present invention provides a system that controls the amount and timing of pilot fuel injection to obtain minimum NOx and UHC emissions. The system senses if combustion occurs, when combustion occurs, and/or the quality of combustion in the combustion chamber of each cylinder of the gaseous fuel engine and adjusts the amount and/or timing of the pilot fuel injected. The minimum amount of pilot fuel needed to ignite gaseous fuel in a combustion chamber is determined and injected into the prechamber or the combustion chamber of the engine. The actual start of combustion location is determined and the injection timing is adjusted if the start of combustion location is not approximately equal to a desired location. The amount of pilot fuel or injection timing is adjusted if a knock or a misfire has occurred or if the combustion quality measure is not approximately equal to a desired quality measure.

Abstract: A guided ball check valve in which the ball is guided to prevent radial wander. The guided ball valve comprises a valve housing having a cylindrical bore. A conical valve seat is provided at a first end of the cylindrical bore. Axial grooves are formed into the cylindrical wall of the bore to provide means for the passage of fluid through the check valve when open. A spherical ball slides in the cylindrical bore between a closed position in which the spherical ball is seated against the conical valve seat and an open position in which a gap is formed between the spherical ball and the conical valve seat. The spherical ball has diameter substantially equivalent to that of the cylindrical bore such that the cylindrical wall of the bore engages and guides the spherical ball as the spherical ball linearly translates between open and closed positions.

Abstract: A guided ball check valve in which the ball is guided to prevent radial wander. The guided ball valve comprises a valve housing having a cylindrical bore. A conical valve seat is provided at a first end of the cylindrical bore. Axial grooves are formed into the cylindrical wall of the bore to provide means for the passage of fluid through the check valve when open. A spherical ball slides in the cylindrical bore between a closed position in which the spherical ball is seated against the conical valve seat and an open position in which a gap is formed between the spherical ball and the conical valve seat. The spherical ball has diameter substantially equivalent to that of the cylindrical bore such that the cylindrical wall of the bore engages and guides the spherical ball as the spherical ball linearly translates between open and closed positions.