초록 ▼

A hydraulic valve actuator and fuel injection system for an internal combustion engine includes an engine driven pump, similar to a diesel fuel metering and distributing pump, which is used to sequentially supply pressurized fuel to each of a plurality of hydraulic actuator plungers positioned to ef

A hydraulic valve actuator and fuel injection system for an internal combustion engine includes an engine driven pump, similar to a diesel fuel metering and distributing pump, which is used to sequentially supply pressurized fuel to each of a plurality of hydraulic actuator plungers positioned to effect opening movement of an associated normally closed inlet valve of the engine, the hydraulic line to each actuator plunger having a solenoid valve associated therewith for controlling flow from the hydraulic line to a relatively low pressure drain conduit whereby to control inlet valve lift duration. Each actuator plunger, during inlet valve opening movement, is used to pressurize liquid fuel for injection into the induction fluid flow to an associated combustion chamber of the engine. In one embodiment, one end of the actuator plunger and one end of its associated actuator cylinder functions as a variable displacement fuel pump supplying fuel to an injection nozzle, and in an alternate embodiment, each actuator plunger is operatively coupled to an associated unit type fuel injector to effect operation thereof.

대표청구항 ▼

A hydraulic valve actuator and fuel injection system for use in an internal combustion engine having an engine housing means with an N number of cylinders each with a piston therein connected to the crankshaft of the engine, said housing means having induction passage means therein connected by inle

A hydraulic valve actuator and fuel injection system for use in an internal combustion engine having an engine housing means with an N number of cylinders each with a piston therein connected to the crankshaft of the engine, said housing means having induction passage means therein connected by inlet ports to said cylinders, an N number of spring biased, normally closed inlet valves controlling flow through said inlet ports, said hydraulic valve actuator and fuel injection system including a source of hydraulic fluid, an N number of cylinder means in said housing means, a hydraulic actuator piston in each said cylinder means operatively connected to one of said inlet valves, a distributor type, liquid pump having an inlet connected to said source of hydraulic fluid and an N number of outlets, an N number of conduit means each with a one-way valve therein connecting said outlets to said cylinder means, said pump being operatively connected to said crankshaft to be driven thereby for delivering measured charges of hydraulic fluid under high pressure sequentially to said cylinder means on the side of said actuator pistons opposite said valve, an N number of branch conduit means each with a normally, open solenoid valve operatively connectable to a source of electrical power controlling flow therethrough, each said branch conduit means being connected at one end to one of said conduit means intermediate said one-way valve and its associated cylinder means and at its other end being in flow communication with said source of hydraulic fluid, fuel supply means, an N number of fuel injection nozzles, each of said fuel injection nozzles being positioned to discharge fuel into an associated said induction passage means upstream of an associated one of said inlet ports, an N number of fuel pressurizing means each having a fuel inlet connected to said fuel supply means and a fuel outlet connected to its associated one of said fuel injection nozzles, each said fuel pressurizing means being operatively associated with one of said actuator pistons whereby to supply pressurized fuel to an associated fuel injection nozzle as an associated said inlet valve is open by an associated said actuator piston.