METHOD AND APPARATUS OF FUELLING AN INTERNAL COMBUSTION ENGINE WITH HYDROGEN AND METHANE

摘要

ABSTRACT METHOD AND APPARATUS OF FUELLING AN INTERNAL COMBUSTION ENGINE WITH HYDROGEN AND METHANE A gaseous-fuelled internal combuslion engine and a method of operating same arc provided for improving combustion stability and reducing emissions of NOx, PM, and unbumcd hydrocarbons. The method comprises fuelling an internal combuslion engine with hydrogen and natural gas, which can be directly injected into the combuslion chamber together or introduced separately. Of the total gaseous fuel delivered to ihe engine, at least 5% by volume at standard temperature and pressure is hydrogen. For at least one engine operating condition, the ratio of fuel rail pressure to peak in-cylinder pressure is al least 1.5: 1. The engine comprises a combustion chamber defined by a cylinder, a cylinder head, and a piston movable within the cylinder; and a fuel injection valve operable for introducing the gaseous fuel mixture directly into the combustion chamber, or two separate fuel injection valves for introducing the methane and hydrogen separately. An electronic controller is in communication with actuator(s) for the fuel injection valve{s) for controlling timing for operating the fuel injection valvc(s). thc engine has a compression ratio of at least 14:1.