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Title: Electromagnetic unit fuel injector

Abstract

This patent describes an electromagnetic unit fuel injector of the type including a housing havine a pump cylinder therein; an externally actuated plunger reciprocable in the cylinder means to define therewith a pump chamber. The housing includes a valve body having a spray outlet at one end thereof for the discharge of fuel. An injection valve is movable in the valve body to control flow through the spray outlet. An inlet passage is in flow communication with the pump chamber and is connectable at its other end to a source of fuel. A pressure modulated servo chamber is in the housing. A spring means and a servo piston means operatively connected to the injection valve with the servo piston means being positioned so as to be acted on by the pressure of fuel in the servo chamber and a discharge passage in the housing connects the pump chamber to the spray outlet and to the servo chamber and has a throttle orifice controlling fuel flow to the servo chamber. The housing means further includes a drain passage means in flow communication at one end with the servo chamber and at its opposite end with a source of fuel at amore » predetermined pressure and a pressure sensitive control valve operatively positioned in the housing. A pull type solenoid is operatively supported in the housing means and a fuel passage means connectable is at one end to a source of fuel at a suitable supply pressure and at its other end being in operative flow communication with the pump chamber. The improvement wherein the control valve is in the form of a poppet valve and wherein the stepped bore includes an enlarged internal diameter portion next adjacent to the valve seat whereby the pressure of fuel in the annulus cavity can act against the head in a valve opening direction and wherein the force of the valve return spring is preselected so that the control valve is also operative as a pressure relief valve.« less

Inventors:
Publication Date:
OSTI Identifier:
5852602
Patent Number(s):
US 4572433
Assignee:
General Motors Corp., Detroit, MI
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 20 Aug 1984
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; FUEL INJECTION SYSTEMS; DESIGN; INTERNAL COMBUSTION ENGINES; CYLINDERS; DRAINAGE; ELECTROMAGNETISM; FLUID FLOW; ORIFICES; POSITIONING; PRESSURE CONTROL; PUMPS; RELIEF VALVES; SOLENOIDS; CONTROL; CONTROL EQUIPMENT; ELECTRIC COILS; ELECTRICAL EQUIPMENT; ENGINES; EQUIPMENT; FLOW REGULATORS; FUEL SYSTEMS; HEAT ENGINES; MAGNETISM; OPENINGS; VALVES; 330100* - Internal Combustion Engines

Citation Formats

Deckard, J I. Electromagnetic unit fuel injector. United States: N. p., 1986. Web.
Deckard, J I. Electromagnetic unit fuel injector. United States.
Deckard, J I. Tue . "Electromagnetic unit fuel injector". United States.
@article{osti_5852602,
title = {Electromagnetic unit fuel injector},
author = {Deckard, J I},
abstractNote = {This patent describes an electromagnetic unit fuel injector of the type including a housing havine a pump cylinder therein; an externally actuated plunger reciprocable in the cylinder means to define therewith a pump chamber. The housing includes a valve body having a spray outlet at one end thereof for the discharge of fuel. An injection valve is movable in the valve body to control flow through the spray outlet. An inlet passage is in flow communication with the pump chamber and is connectable at its other end to a source of fuel. A pressure modulated servo chamber is in the housing. A spring means and a servo piston means operatively connected to the injection valve with the servo piston means being positioned so as to be acted on by the pressure of fuel in the servo chamber and a discharge passage in the housing connects the pump chamber to the spray outlet and to the servo chamber and has a throttle orifice controlling fuel flow to the servo chamber. The housing means further includes a drain passage means in flow communication at one end with the servo chamber and at its opposite end with a source of fuel at a predetermined pressure and a pressure sensitive control valve operatively positioned in the housing. A pull type solenoid is operatively supported in the housing means and a fuel passage means connectable is at one end to a source of fuel at a suitable supply pressure and at its other end being in operative flow communication with the pump chamber. The improvement wherein the control valve is in the form of a poppet valve and wherein the stepped bore includes an enlarged internal diameter portion next adjacent to the valve seat whereby the pressure of fuel in the annulus cavity can act against the head in a valve opening direction and wherein the force of the valve return spring is preselected so that the control valve is also operative as a pressure relief valve.},
doi = {},
url = {https://www.osti.gov/biblio/5852602}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {2}
}