Abstract: A spark ignited gaseous fuel engine including an exhaust gas recirculation system and method for operating a gaseous fuel engine are provided. The exhaust gas recirculation system has an adjustable flow and is operable to supply exhaust gas to at least one engine cylinder. The engine further includes means for determining a value indicative of a charge density of a combustion mixture that includes gaseous fuel, air and exhaust gas supplied to the at least one cylinder, and adjusting a flow quantity through the exhaust gas recirculation system based at least in part on the value. The charge density may permit the controller to set a NOx output rate from the engine via a pre-determined correlation between charge density and NOx output.

Abstract: A spark ignited gaseous fuel engine including an exhaust gas recirculation system and method for operating a gaseous fuel engine are provided. The exhaust gas recirculation system has an adjustable flow and is operable to supply exhaust gas to at least one engine cylinder. The engine further includes means for determining a value indicative of a charge density of a combustion mixture that includes gaseous fuel, air and exhaust gas supplied to the at least one cylinder, and adjusting a flow quantity through the exhaust gas recirculation system based at least in part on the value. The charge density may permit the controller to set a NOx output rate from the engine via a pre-determined correlation between charge density and NOx output.

Abstract: An engine emissions control system may include an electronic control module and a nitrogen oxide sensor in communication with the electronic control module. The nitrogen oxide sensor may be mounted on an exhaust system of an engine and may be configured to provide the electronic control module with feedback indicative of an actual level of nitrogen oxide in an exhaust stream flowing through the exhaust system. The engine emissions control system may also include an engine parameter adjustment assembly controlled by the electronic control module. The electronic control module may automatically actuate the engine parameter adjustment assembly to adjust an engine flow until the actual level of nitrogen oxide reaches a desired level of nitrogen oxide.

Abstract: Apparatuses and methods for determining a desired charge density for an engine. A first characteristic indicative of an engine speed of the engine is determined. A second characteristic indicative of a load on the engine is determined. A value indicative of a desired charge density of a combustion mixture for the engine is determined as a function of the first and second characteristics.

Abstract: Spark plugs in an internal combustion engine may have an encapsulated spark gap allowing for improved emissions and efficiency. However, increased temperatures in an ignition chamber about the spark gap may cause pre-ignition of a air fuel mixture in a combustion chamber. A purge passage allows hot exhaust gas to be expelled from the ignition chamber and thus reduce likelihood of pre-ignition.

Abstract: Apparatus and methods for determining a desired charge density for an engine having an inlet air pathway. A first characteristic indicative of an engine speed of the engine is determined. A second characteristic indicative of a load on the engine is determined. A third characteristic indicative of a humidity of air in the inlet air pathway. A value indicative of a desired charge density of a combustion mixture for the engine is determined as a function of the first, second, and third characteristics.

Abstract: Apparatus and methods for determining a desired charge density for an engine having an inlet air pathway. A first characteristic indicative of an engine speed of the engine is determined. A second characteristic indicative of a load on the engine is determined. A third characteristic indicative of a humidity of air in the inlet air pathway. A value indicative of a desired charge density of a combustion mixture for the engine is determined as a function of the first, second, and third characteristics.

Abstract: Apparatuses and methods for determining a desired charge density for an engine. A first characteristic indicative of an engine speed of the engine is determined. A second characteristic indicative of a load on the engine is determined. A value indicative of a desired charge density of a combustion mixture for the engine is determined as a function of the first and second characteristics.