Fuel injection device for internal combustion engines with an antechamber and a main chamber

摘要

A low pressure direct injection fuel system for preignition engines in which the main fraction of the compressed charge of the engine is ignited by exposure to a hot gas exiting from a smaller volume spark ignition prechamber forces fuel into each chamber and/or prechamber of the engine during all or a segment of the low pressure scavenging periods of the engine cycle via passages containing valves to prevent backflow of fuel and gases during the high pressure period of the engine cycle. The engine runs unthrottled solely on the prechamber fuel charge and the amount of fuel fed to the prechamber is decreased with increased engine load so that a uniform combustible charge is present in the prechamber during all engine load and speed regimes.