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Title: Fuel injection system for diesel engines

Abstract

A fuel injection system is disclosed for direct injection diesel engines with a depression in the tops of the pistons. A first injection pump has a regulator and accompanying first injector for each cylinder , the injectors being disposed to spray the fuel in a zone around the center axis of the respective piston depression. A second injection pump has a regulator and accompanying second injector for each cylinder, the second injectors being disposed to inject fuel obliquely from the side into the respective piston depression in a direction counter to the rotation of the intake air before the fuel from the first injectors is injected.

Inventors:
Publication Date:
OSTI Identifier:
6072341
Patent Number(s):
US 4273084
Assignee:
Volvo Ab (Sweden) IFI; EDB-82-012744
Resource Type:
Patent
Resource Relation:
Patent Priority Date: Priority date 23 Nov 1977, Sweden
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; DIESEL ENGINES; FUEL INJECTION SYSTEMS; DESIGN; PISTONS; PUMPS; ENGINES; FUEL SYSTEMS; HEAT ENGINES; INTERNAL COMBUSTION ENGINES; 330102* - Internal Combustion Engines- Diesel

Citation Formats

Holmer, H.E.. Fuel injection system for diesel engines. United States: N. p., 1981. Web.
Holmer, H.E.. Fuel injection system for diesel engines. United States.
Holmer, H.E.. Tue . "Fuel injection system for diesel engines". United States. doi:.
@article{osti_6072341,
title = {Fuel injection system for diesel engines},
author = {Holmer, H.E.},
abstractNote = {A fuel injection system is disclosed for direct injection diesel engines with a depression in the tops of the pistons. A first injection pump has a regulator and accompanying first injector for each cylinder , the injectors being disposed to spray the fuel in a zone around the center axis of the respective piston depression. A second injection pump has a regulator and accompanying second injector for each cylinder, the second injectors being disposed to inject fuel obliquely from the side into the respective piston depression in a direction counter to the rotation of the intake air before the fuel from the first injectors is injected.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 16 00:00:00 EDT 1981},
month = {Tue Jun 16 00:00:00 EDT 1981}
}
  • 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 apparatus is described for a multi-cylinder diesel engine, comprising: a fuel injection pump having a fuel regulating member; a first means for producing at least one electric signal which represents an operating condition of the diesel engine; a second means responsive to at least the electric signal for determining the cylinder of cylinders of the diesel engine to be used; a control device which is responsive to the result of the determination in the second means and in accordance with the result of the determination in the second means controls the fuel supply so as to supplymore » fuel to all of the cylinders in a non-skip-cylinder mode operation or to only selected cylinders in a skip-cylinder mode operation; and a third means responsive to at least the electric signal for regulating the amount of fuel injected the fuel injection pump on the basis of a governor characteristic determined in accordance with the result of the determination in the second means.« less
  • This patent describes a method of controlling the timing of fuel injection into a diesel engine having a fuel injection pump, an injection pump, an injection timing control device operatively connected to the fuel injection pump, and an electronic control unit, the method comprising the steps of: (a) detecting the rotational speed of the engine; (b) detecting a fuel injection quantity supplied to the engine as a parameter value indicative of the magnitude of load on the engine; (c) calculating a desired value of the fuel injection timing based upon the engine rotational speed and the fuel injection quantity thusmore » detected, by means of the electronic control unit; and (d) driving the injection timing control device according to the desired value of the fuel injection timing thus calculated, so as to minimize the difference between the calculated desired value of the fuel injection timing and an actual value of the fuel injection timing, by means of the electronic control unit; wherein the engine has an oxygen concentration sensor for detecting oxygen concentration in exhaust gases emitted from the engine and for providing an output indicative of the detected oxygen concentration; and the step (b) comprising detecting the fuel injection quantity solely from an output of the oxygen concentration sensor indicative of the oxygen concentration, the output of the oxygen concentration sensor varying in linear proportion to a change in the fuel injection quantity.« less
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