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Title: High-pressure fuel injection system for diesel engine

Abstract

This patent describes a high-pressure fuel injection system for a diesel engine. This system consists of: (a) main pumps for injecting fuel each located at one of cylinders of the engine and formed with a fuel injecting port, a discharge valve located in a path connecting the first injected fuel space with the fuel injecting port. The discharge valve is opened when the fuel to be injected reaches a predetermined pressure level. A first injection timing fuel space fluidly connected with the first injected fuel space through a movable shuttle is filled with injection timing fuel, and a plunger varies the volume of the first injection timing fuel space; (b) a metering and distributing pump formed with injection fuel outputs and injection timing fuel outlets corresponding in number to the cylinders of the engine for discharging fuel in timed relation to the rotation of the engine; (c) fuel metering valves for metering fuel flowing into the second injected fuel space and second injection timing fuel space respectively; (d) pipes for fluidly connecting the first injected fuel space and first injection timing fuel space of the main pump for injecting fuel with the injected fuel outlets and injection timing fuel outletsmore » of the metering and distributing pump respectively; and (e) a rocker arm mechanism for driving the plunger of the main pump for injecting fuel in timed relation to the rotation of the engine.« less

Inventors:
Publication Date:
OSTI Identifier:
5927204
Patent Number(s):
US 4565172
Assignee:
Hitachi, Ltd., Tokyo NOV; EDB-86-095235
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 28 Aug 1984
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; DIESEL ENGINES; FUEL INJECTION SYSTEMS; DESIGN; COMPRESSION; CYLINDERS; METERING; PIPES; PRESSURE CONTROL; PUMPS; ROTATION; SPACE DEPENDENCE; TIME DEPENDENCE; VALVES; CONTROL; CONTROL EQUIPMENT; ENGINES; EQUIPMENT; FLOW REGULATORS; FUEL SYSTEMS; HEAT ENGINES; INTERNAL COMBUSTION ENGINES; MOTION; 330102* - Internal Combustion Engines- Diesel

Citation Formats

Hoshi, Y. High-pressure fuel injection system for diesel engine. United States: N. p., 1986. Web.
Hoshi, Y. High-pressure fuel injection system for diesel engine. United States.
Hoshi, Y. 1986. "High-pressure fuel injection system for diesel engine". United States. doi:.
@article{osti_5927204,
title = {High-pressure fuel injection system for diesel engine},
author = {Hoshi, Y.},
abstractNote = {This patent describes a high-pressure fuel injection system for a diesel engine. This system consists of: (a) main pumps for injecting fuel each located at one of cylinders of the engine and formed with a fuel injecting port, a discharge valve located in a path connecting the first injected fuel space with the fuel injecting port. The discharge valve is opened when the fuel to be injected reaches a predetermined pressure level. A first injection timing fuel space fluidly connected with the first injected fuel space through a movable shuttle is filled with injection timing fuel, and a plunger varies the volume of the first injection timing fuel space; (b) a metering and distributing pump formed with injection fuel outputs and injection timing fuel outlets corresponding in number to the cylinders of the engine for discharging fuel in timed relation to the rotation of the engine; (c) fuel metering valves for metering fuel flowing into the second injected fuel space and second injection timing fuel space respectively; (d) pipes for fluidly connecting the first injected fuel space and first injection timing fuel space of the main pump for injecting fuel with the injected fuel outlets and injection timing fuel outlets of the metering and distributing pump respectively; and (e) a rocker arm mechanism for driving the plunger of the main pump for injecting fuel in timed relation to the rotation of the engine.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1986,
month = 1
}
  • This patent describes a system for controlling throttling of intake air in an intake air passage and pressure of fuel injection in a swirl chamber of a diesel engine. The system consists of: 1.) an intake air throttling mechanism provided in the intake air passage; 2.) a fuel injection apparatus provided in the swirl chamber, the valve opening pressure of the fuel injection apparatus being variable; and 3.) a device for controlling the intake air throttling mechanism and the fuel injection apparatus. The control device reduces the valve opening pressure of the fuel injection apparatus when closing the intake airmore » throttling in accordance with predetermined operating parameters of the engine.« less
  • This patent describes a high pressure common rail for use in a diesel fuel injection system. It comprises a body formed of a unitary structure having a plurality of parallel first elongated bores formed from one end thereof and a plurality of second bores intersecting the first bores at right angles to the longitudinal axis thereof to form a plurality of communicating internal chambers, inlet fittings being mounted in the first bores adapted to receive fuel under pressure to the first bores and outlet fittings being mounted in the second bores for discharging fuel from the second bores, under themore » influence of the inlet fuel pressure; and relief valve means connected to the internal chambers to prevent the fluid pressure in the internal chambers from exceeding a predetermined level whereby the fuel pressure being discharged from the internal chambers is generally at the predetermined pressure.« less
  • This patent describes an electromagnetically actuated fuel pump for a diesel engine fuel injection. It comprises a body adapted to receive fuel from a source; a rotatable camshaft supported in the body so as to be rotatable about an axis, and having a pair of cam lobes including a first cam lobe and a second cam lobe adapted to rotate in an annular path about the axis of rotation of the camshaft; at least one pair of reciprocating pumping elements mounted in the body perpendicular to the axis of rotation of the camshaft, each of the pumping elements including anmore » elongated plunger having an axial passage including a first end and a second end; and means for fluidly connecting the pumping elements to fuel injection means for passing fuel under pressure thereto in response to rotation of the camshaft.« less
  • A fuel injection system for a diesel engine is described comprising: (a) a fuel injection pump for delivering a controlled quantity of high pressure fuel cyclically at a timing synchronized with the operation of the engine; (b) a fuel injection nozzle hydraulically connected to the injection pump for receiving high pressure fuel therefrom and injecting the fuel into an engine cylinder; (c) means for controlling a rate of injection of the system in response to operating conditions of the engine; and (d) passage means for providing, during each delivery stroke of the pump plunger, fluid communication between the pumping chambermore » and the variable volume chamber only for a predetermined initial phase of the delivery stroke. The variable volume chamber is hydraulically isolated from the pumping chamber during subsequent phases of the delivery stroke.« less
  • Test results from a high-pressure electronically controlled fuel injection system are compared with a commercial mechanical injection system on a single cylinder, diesel test engine using an inlet boost pressue ratio of 2.6:1. The electronic fuel injection system achieved high pressure by means of a fluid intensifier with peak injection pressures of 47 to 69 MPa. Reduced exhaust emissions were demonstrated with an increasing rate of injection followed by a fast cutoff of injection. The reduction in emissions is more responsive to the rate of injection and injection timing than to high peak injection pressure.