EP1717439A1 - Système d'injection de carburant pour moteurs à combustion interne - Google Patents

Système d'injection de carburant pour moteurs à combustion interne Download PDF

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Publication number
EP1717439A1
EP1717439A1 EP06112490A EP06112490A EP1717439A1 EP 1717439 A1 EP1717439 A1 EP 1717439A1 EP 06112490 A EP06112490 A EP 06112490A EP 06112490 A EP06112490 A EP 06112490A EP 1717439 A1 EP1717439 A1 EP 1717439A1
Authority
EP
European Patent Office
Prior art keywords
fuel
supply
injector
piston
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06112490A
Other languages
German (de)
English (en)
Other versions
EP1717439B1 (fr
EP1717439B9 (fr
Inventor
Pierluigi Dell'orto
Pasquale Grassia
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dell Orto SpA
Original Assignee
Dell Orto SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dell Orto SpA filed Critical Dell Orto SpA
Publication of EP1717439A1 publication Critical patent/EP1717439A1/fr
Publication of EP1717439B1 publication Critical patent/EP1717439B1/fr
Application granted granted Critical
Publication of EP1717439B9 publication Critical patent/EP1717439B9/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/18—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps characterised by the pumping action being achieved through release of pre-compressed springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/04—Pumps peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/027—Injectors structurally combined with fuel-injection pumps characterised by the pump drive electric

Definitions

  • the device subject of the present invention falls in the sector of fuel supply systems for internal combustion engines.
  • a large part of internal combustion engines is currently supplied with fuel injection systems which, according to applications, have operating pressures varying between 2 bar and 150 bar.
  • roller rotary electropumps operated by a direct-current motor (as well as go-devil pumps or liquid-ring pumps) are widely used in the technical practice.
  • mechanically-operated alternative pumps are nearly always employed.
  • by-pass pressure adjusters are normally employed.
  • Fig. 1 shows the diagram of a conventional fuel-injection system.
  • the fuel to be processed is drawn from tank 1 and arrives, through a filtering system 2, at pump 3 which provides to pressurise it and to send it to injector 4.
  • Injector 4 adjusts the fuel flow, which reaches the engine through the intake manifolds or is directly injected into the combustion chamber.
  • Supply pressure adjustment is the task, as already mentioned, of a pressure adjuster 5 which, arranged downstream of the pump, is generally integrated in a by-pass circuit.
  • Pressure adjustment through a by-pass system provides for the pump capacity to be oversize, according to the maximum flow rate required by the injector.
  • pump capacity is defined according to the value of the flow rate required by the injector upon maximum power delivery by the engine, and is further suitably increased in order to take into account the part of fuel which is in any case led into the by-pass circuit by the adjuster.
  • the object of the present invention is achieved by employing a fuel pressurisation system which provides both to pressurise the fuel and to adjust the desired pressure value without using additional external devices, of the type of known pressure adjusters.
  • the system according to the present invention consists of the same essential elements already seen in connection with fig. 1 of the known art, i.e.:
  • the operation of the proposed system provides that the fuel taken from tank 1 flows through filtering system 2 and arrives at pump-injector assembly 3-4, which is capable of adjusting the pressure to a preset value.
  • a bell body 10 is housed, wherein a chamber 11 is formed, where the fuel arrives, within which a contrast spring 12 is housed; said spring rests above against a fixed collar 3b of the fuel supply conduit 3a to pump unit 3, and rests below against the upper surface of a piston 15.
  • Said piston has at the same time the function both of intake and supply piston of the fuel coming from conduit 3a, and that of movable anchor, sensitive to the magnetic field generated by an electromagnet.
  • reel 13 of said electromagnet is arranged, inwardly closed by a metal sheet 13a and housed in a supporting body 14.
  • the wall of said metal sheet 13a builds, together with wall 14a of body 14, a cylinder guiding the displacements of piston 15.
  • Piston 15 is hollow and its inner cylindrical chamber in turn builds a guide of the same piston 15 on a cylindrical extension 16 of closing base 17 of body 3.
  • a central cavity 18 is formed, which extends into an axial hole 18a in the same base 17; hole 18a puts in communication chamber 18 with end chamber 19 mounting injector unit 4, as better described in the following.
  • a non-return valve is housed, consisting of a valve body 20, for example a spherical one, and of a contrast spring 21.
  • electromagnet reel 13 When electromagnet reel 13 is electrically energised, it causes the upward (with reference to the drawing) displacement of anchor 15; structure, size and arrangement of spring 12 and valve 20-21, known per se, are such that the upward displacement of anchor 15 determines, in addition to compression of spring 12, the opening of valve 20 and the flow of fuel from chamber 11, i.e. from conduit 3a, to chamber 18.
  • valve 20 When piston 15 has reached the upper end stop and stops, spring 21 causes the closure of valve 20. If, at this stage, electromagnet reel 13 is de-energised, the fuel in chamber 18, 18a, 19 - not being able to be released towards the injector (as better explained in the following), nor backwards towards chamber 11 - remains pressurised, under the action of piston 15, pushed by spring 12. The value of this pressure is determined by the ratio between the load of said spring 12 on piston 15 and the useful surface of piston 15.
  • Injector unit 4 is directly connected with pump unit 3 by way of the engagement of extension 4a of body 4 into chamber 19, for example by simple screwing in.
  • the structure of the injector unit essentially comprises: a first hollow cylindrical body 22, forming a first injector supply chamber 22a; a bell body 23, in whose central chamber a contrast spring 24 is housed; a movable anchor 25, shaped as a cylinder and equipped with an axial boring 25a; an electromagnet reel 26, which partly surrounds the chamber housing spring 24 and partly anchor 25; and a fuel injection nozzle 27, with corresponding closing needle 28, housed in a chamber 29 formed at the bottom of the sliding seat of anchor 25: needle 28 is integral with anchor 25 and is therefore normally closed when electromagnet 26 is not energised and spring 24 pushes anchor 25 downwards.
  • chamber 18 of the pump unit is directly and freely in communication with conduit 18a, with chamber 19, with chamber 22a, with the chamber housing spring 24, with conduit 25a and with chamber 29 supplying injector 4. Therefore, when the fuel is pressurised in chamber 18, it is equally so in chamber 29.
  • the sizing of the pump unit, in relation to the delivery capability of the injector, is such that, when the engine is operated at high rpm, i.e. when the maximum quantity of supply fuel is required, a pump supply impulse must occur at each opening of the injector.
  • phase a) corresponds to piston rise, with reload of spring 15 and simultaneous fuel intake towards chamber 18;
  • phase b) is a piston holding phase while waiting to supply the injector with fuel; and
  • phase c) corresponds to the fuel injection phase, wherein the fuel is released and the piston is moved downwards.
  • the diagram of fig. 5 shows instead the time ratio between the activation signals of electromagnet 13 of the pump and of injector 26, respectively; here it is evident that the pump activation signal is generated immediately after the end of the injector one.
  • electromagnet 26 controlling the opening of injector needle 28 is energised and kept energised for the time necessary for the injection of the required fuel amount according to the engine rpm; for all this time, fuel supply is guaranteed by the displacement of piston 15 under the action of spring 12, which extends itself.
  • pump unit electromagnet 13 is then energised, which causes piston 15 to rise and spring 12 to reload.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP20060112490 2005-04-18 2006-04-11 Système d'injection de carburant pour moteurs à combustion interne Expired - Lifetime EP1717439B9 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20050688 ITMI20050688A1 (it) 2005-04-18 2005-04-18 Impianto di alimentazione del combustibile per motori a combustione interna e gruppo pompa-iniettore ad azionamento elettromagnetico utilizzato in tale impianto

Publications (3)

Publication Number Publication Date
EP1717439A1 true EP1717439A1 (fr) 2006-11-02
EP1717439B1 EP1717439B1 (fr) 2008-01-09
EP1717439B9 EP1717439B9 (fr) 2008-12-03

Family

ID=35809617

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060112490 Expired - Lifetime EP1717439B9 (fr) 2005-04-18 2006-04-11 Système d'injection de carburant pour moteurs à combustion interne

Country Status (3)

Country Link
EP (1) EP1717439B9 (fr)
DE (1) DE602006000410T2 (fr)
IT (1) ITMI20050688A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288216A1 (fr) * 1987-04-15 1988-10-26 Eaton S.A.M. Pompe électrique à liquides
WO1994018449A1 (fr) * 1993-02-01 1994-08-18 Sampower Oy Procede et appareil de regulation de l'injection de carburant
EP0953764A1 (fr) * 1998-04-27 1999-11-03 MAGNETI MARELLI S.p.A. Pompe volumétrique
US20030047625A1 (en) * 2000-03-10 2003-03-13 Paul Tinwell Fuel injector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288216A1 (fr) * 1987-04-15 1988-10-26 Eaton S.A.M. Pompe électrique à liquides
WO1994018449A1 (fr) * 1993-02-01 1994-08-18 Sampower Oy Procede et appareil de regulation de l'injection de carburant
EP0953764A1 (fr) * 1998-04-27 1999-11-03 MAGNETI MARELLI S.p.A. Pompe volumétrique
US20030047625A1 (en) * 2000-03-10 2003-03-13 Paul Tinwell Fuel injector

Also Published As

Publication number Publication date
DE602006000410D1 (de) 2008-02-21
ITMI20050688A1 (it) 2006-10-19
EP1717439B1 (fr) 2008-01-09
DE602006000410T2 (de) 2009-01-08
EP1717439B9 (fr) 2008-12-03

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