Patent ID: 6460785
Filing Date: 2002-10-08
Classification: F02M,Y02T

Abstract:
A high pressure fuel injection system for injecting high pressure gaseous fuel from a gaseous fuel supply into the cylinders of an engine, comprising:an oil reservoir of hydraulic oil; a hydraulic oil supply of hydraulic oil at a higher pressure than the oil reservoir; a gas/oil separator located in a safe location remote from the cylinders of the engine, the gas oil separator adapted to separate any gaseous fuel from the hydraulic oil and return the separated oil to the oil reservoir; an electronic controller providing electrical control signals; a plurality of high pressure, fuel injector valve assemblies for injecting fuel into the cylinders of the engine, each fuel injector valve assembly including electrohydraulic valve and a fuel injector, the electrohydraulic valve being connected to the electronic controller, the high pressure hydraulic oil supply and the oil reservoir, the electrohydraulic valve successively creating hydraulic signals in response to electrical control signals, the fuel injector including a fuel valve operated by a piston and an outlet port in communication with the gaseous fuel supply, the piston reciprocating the fuel valve in response to hydraulic signals to open and close the outlet port and thereby successively inject gaseous fuel into the cylinder, each fuel injector valve assembly further including means for collecting leakage of oil and leakage of gaseous fuel and communicating any such leaked oil and leaked gas to the gas/oil separator.