Patent attributes
A combined injector and fuel pump suitable for high pressure direct injection of heavy fuels into Diesel engines, in particular small light weight Diesel engines as may be used in small aircraft. The injector utilizes a piezoelectric actuator driving a piston assembly comprising an inlet reed check valve disposed thereon. Fuel enters an inlet port coupled to an inlet chamber on a first side of the piston. Piezoelectric actuator contraction transfers fuel from the inlet chamber through the reed valve to the pressurization chamber on a second side of the piston. Piezoelectric actuator expansion drives the piston to pressurize the fuel in the pressurization chamber, which forces open a conical annular valve and nozzle assembly injecting a finely atomized mist of fuel into the cylinder.
