Dual nozzle single pump fuel injection system

Claim 1

A fuel injection system in a stratified charge hybrid internal combustion engine including a main combustion chamber, a precombustion chamber connected with the main chamber, fuel injectors in the main combustion chamber and precombustion chamber which open at higher and lower pressure levels respectively to sequentially inject fuel into the prechamber and the main chamber, timed spark ignition means in the prechamber for ignition of the fuel-air mixture therein, and an engine driven and timed fuel injection pump having a variable output capacity that varies with power level position, the injection pump is supplied by a low pressure charging pump, the improvement comprising: a shuttle valve including a bore therein. a shuttle spool means positioned within the bore defining a prechamber supply chamber on one side thereof and a spool activation chamber on the opposite side thereof said spool means having a first and second position; biasing means urging the spool towards it first position with the spool actuation chamber at its minimum volume; first conduit means connecting charging pressure to the prechamber supply chamber in the first position oi the spool means; second conduit means connecting the injection pump to spool actuation chamber: third conduit means connecting the spool actuating chamber with the main injector; fourth conduit means connecting the prechamber supply chamber with the prechamber injector; the initial charge from the injection pump actuates the spool means from its first to its second position, valving closed the first conduit means and displacing the spool means into the prechamber supply chamber, a fuel displacement amount required in the prechamber injector until the spool means reaches its second position whereupon the fuel pressure from the injection pump rises to the opening level of the main injector flowing through the spool actuation chamber and electrical ignition trigger means in the shuttle valve which triggers the ignition means as the spool means moves from its first position.