EP0828936A1 - Soupape d'injection - Google Patents

Soupape d'injection

Info

Publication number
EP0828936A1
EP0828936A1 EP96914853A EP96914853A EP0828936A1 EP 0828936 A1 EP0828936 A1 EP 0828936A1 EP 96914853 A EP96914853 A EP 96914853A EP 96914853 A EP96914853 A EP 96914853A EP 0828936 A1 EP0828936 A1 EP 0828936A1
Authority
EP
European Patent Office
Prior art keywords
nozzle needle
injection valve
piston
secondary piston
injection
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
EP96914853A
Other languages
German (de)
English (en)
Other versions
EP0828936B1 (fr
Inventor
Wendelin KLÜGL
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0828936A1 publication Critical patent/EP0828936A1/fr
Application granted granted Critical
Publication of EP0828936B1 publication Critical patent/EP0828936B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/06—Other fuel injectors 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
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/704—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with actuator and actuated element moving in different directions, e.g. in opposite directions

Definitions

  • the invention relates to an injection valve according to the preamble of claim 1.
  • Such an injection valve is known for example from EP-A 0 531 533.
  • This publication deals with a diesel injection device with a high-pressure system (common rail system), in which the fuel is supplied to a high-pressure accumulator via a high-pressure pump. This fuel, which is under high pressure, is then fed to the individual cylinders of a diesel engine via injection valves in accordance with a control.
  • the injection valves are each controlled by a solenoid valve, for example to enable individual injection times.
  • the injection valves should be able to be switched quickly at high injection pressures.
  • a pre-injection is difficult to use when using a solenoid valve, since the switching times of the solenoid valve are too long and the valve has to go through the full stroke in order to achieve reproducible conditions, for example the injection quantity.
  • the shaping of the injection rate i.e. Slow opening, but fastest closing of the nozzle needle, whereby the injection rate can be shaped according to a map, hardly possible.
  • the nozzle needle is actuated practically directly by the piezo actuator, the nozzle needle is actuated as quickly as possible.
  • the illustration shows an injection valve in section.
  • the injection valve shown in the figure consists of an elongated housing 5, on the lower end of which a union nut 3 is screwed on. With this cap nut 3, an intermediate washer 4 and a nozzle body 1, in which a nozzle needle 2 is guided, are held from the lower end of the housing 5.
  • the intermediate disk 4 and the nozzle body 1 have a central bore in which the nozzle needle 2 is guided so as to be displaceable in the axial direction.
  • a stepped plunger 7 is guided in the axial direction, which rests against the nozzle needle 2 at one end and is connected at the other end to a secondary piston 14 of the piezoelectric drive device.
  • a first pressure chamber 8 is provided, which is connected to a fuel inlet connection 10 via an inlet bore 9.
  • This high-pressure inlet connection 10 is also connected via an inlet bore 6 to a second pressure chamber 11, in the area of which the nozzle needle 2 is stepped, whereby a control surface for controlling the nozzle needle 2 is formed.
  • the tappet 7 is connected to a secondary piston 14 which is guided in a primary piston.
  • a piezo actuator 20 acts on the primary piston, which is mounted in a closure 21 and is opposite the actuator.
  • door housing 12 is sealed by an O-ring 22.
  • the closure 21 is secured in the axial direction by means of a securing ring 24. Electrical connections 23 lead to the actuator 20.
  • the piezo actuator 20 acts via the primary piston 19 on a plate spring 13. Furthermore, a spring 15 is provided in the recess of the secondary piston, which presses on an inner surface of the primary piston 19.
  • the injection valve also has a plurality of bores or spaces which are under low pressure.
  • This space 16 is connected to a return 25 via a leakage bore 27 and 29.
  • the piezo actuator 20 is arranged in a leakage space 26, which also opens into the return.
  • This space 26 is further connected via a relief bore 18 to a space 17 in which the spring 15 is arranged.
  • the working space 28 in the area of the plate spring 13 is always filled with fuel, which penetrates into this space due to the play between the upper area of the tappet 7 and the housing 5.
  • the effective areas for the pressure are designed so that the ring area on the plunger 7 is somewhat smaller than the ring area on the pressure shoulder of the nozzle needle 2. Therefore, even when the nozzle needle 2 is closed, there is always a resulting pressure force which acts upwards. but it is such that it is exceeded by the spring force of the spring 15, whereby the nozzle needle 2 is pressed securely onto its seat. No injection takes place in this position.
  • the effective diameters of the plunger 7 and the nozzle needle 2 mentioned are designed so that the spring 15 can be designed for acceptable, small forces.
  • the spring force must be so great that the nozzle needle 2 can be pressed onto the seat quickly enough at the end of the injection. It should be borne in mind that it acts upwards during the injection of the nozzle seat area.
  • a quick closing process of the nozzle needle has a favorable effect on the exhaust gas values of the internal combustion engine.
  • a piezo actuator offers the possibility of realizing faster switching operations than an electromagnet.
  • the small paths that a piezo actuator makes and therefore have to be translated are problematic.
  • the tappet 7 to the housing 5 and the secondary piston 14 to the primary piston 19 and the primary piston 19 to the actuator housing 12 are paired with one another with fits.
  • the fits only represent a gap seal, so that a small amount of fuel can constantly leak from the inlet 10 through the pressure chamber 8 along the tappet 7.
  • One L-corner portion goes in the direction of the nozzle needle 2 and must be fed to the return via the leakage holes 29 and 27.
  • the other leakage part enters the working space 28 and keeps it filled. Leakage fuel with excess flow flows along the secondary piston 14 via the relief bore 18 into the leakage space 26 and from there to the return 25.
  • the working space 28 is thus always full of fuel.
  • Disc spring 13 presses primary piston 19 with a defined preload against piezo actuator 20 into the starting position without play.
  • the plunger 7 In the starting position (rest position), the plunger 7 is pressed down by the spring 15 via the secondary piston 14 (no injection in this state).
  • the piezo actuator 20 When the piezo actuator 20 is energized, it expands downward and also moves the primary piston 19 downward against the force of the telescopic spring 13.
  • the volume of liquid in the working space 28 is displaced and guides the secondary piston 14 with the plunger upwards, as a result of which the nozzle needle 2 is moved upwards due to the resulting pressure force.
  • the start of injection is hereby triggered.
  • This construction of the piezo actuator with the two pistons ensures that the plunger 7 and thus the nozzle needle 2 are always moved from a defined starting position.
  • the return 25 is relieved to low pressure.
  • Piezo stacks are preferred as the piezo actuator, which also facilitate operation with relatively low voltages in the vehicle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne une soupape d'injection comportant une aiguille d'injection (2) placée dans un corps de soupape (1), une arrivée de carburant et un dispositif de commande piézo-électrique à conversion hydraulique. Afin de permettre un actionnement rapide de la soupape, il est prévu que l'aiguille d'injection (2) puisse être pilotée directement par l'intermédiaire d'une tige-poussoir (7), par un piston secondaire (14), pouvant être actionné par le piston primaire (19) de l'unité de commande piézo-électrique. Cette soupape d'injection s'utilise dans des systèmes d'injection de carburant Diesel.
EP96914853A 1995-05-24 1996-05-11 Soupape d'injection Expired - Lifetime EP0828936B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19519191 1995-05-24
DE19519191A DE19519191C2 (de) 1995-05-24 1995-05-24 Einspritzventil
PCT/DE1996/000818 WO1996037698A1 (fr) 1995-05-24 1996-05-11 Soupape d'injection

Publications (2)

Publication Number Publication Date
EP0828936A1 true EP0828936A1 (fr) 1998-03-18
EP0828936B1 EP0828936B1 (fr) 2000-03-22

Family

ID=7762838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96914853A Expired - Lifetime EP0828936B1 (fr) 1995-05-24 1996-05-11 Soupape d'injection

Country Status (4)

Country Link
EP (1) EP0828936B1 (fr)
DE (2) DE19519191C2 (fr)
ES (1) ES2145446T3 (fr)
WO (1) WO1996037698A1 (fr)

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US5884848A (en) * 1997-05-09 1999-03-23 Cummins Engine Company, Inc. Fuel injector with piezoelectric and hydraulically actuated needle valve
US5979803A (en) * 1997-05-09 1999-11-09 Cummins Engine Company Fuel injector with pressure balanced needle valve
DE19726125C2 (de) * 1997-06-20 1999-04-15 Telefunken Microelectron Verfahren zur Einspritzung von Kraftstoff
DE19727992C2 (de) * 1997-07-01 1999-05-20 Siemens Ag Ausgleichselement zur Kompensation temperaturbedingter Längenänderungen von elektromechanischen Stellsystemen
DE19742943C1 (de) * 1997-09-29 1999-04-22 Siemens Ag Vorrichtung in einem Einspritzventil zum Halten einer formschlüssigen Verbindung
DE19817320C1 (de) * 1998-04-18 1999-11-11 Daimler Chrysler Ag Einspritzventil für Kraftstoffeinspritzsysteme
DE19839125C1 (de) * 1998-08-27 2000-04-20 Siemens Ag Vorrichtung und Verfahren zur Dosierung von Fluid
DE19843578A1 (de) * 1998-09-23 2000-03-30 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19857338C1 (de) * 1998-12-11 2000-10-05 Siemens Ag Dosiervorrichtung
DE19858758C1 (de) * 1998-12-18 2000-09-07 Siemens Ag Vorrichtung und Verfahren zur Hubübertragung
DE19907931A1 (de) * 1999-02-24 2000-09-14 Siemens Ag Dosiervorrichtung
DE19914714C2 (de) * 1999-03-31 2001-09-20 Siemens Ag Injektor für Speicher-Kraftstoffeinspritzsysteme
DE50010902D1 (de) 1999-04-20 2005-09-15 Siemens Ag Fluiddosiervorrichtung
DE19942816A1 (de) * 1999-09-08 2001-03-22 Daimler Chrysler Ag Einspritzventil
DE19956830C2 (de) * 1999-11-25 2002-07-18 Siemens Ag Durchführung
DE10007735A1 (de) * 2000-02-19 2001-09-06 Daimler Chrysler Ag Einspritzventil
DE10029629A1 (de) * 2000-06-15 2002-01-03 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE10042231B4 (de) * 2000-08-28 2004-09-30 Siemens Ag Einspspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine sowie Verfahren zur Steuerung des Öffnungs-und Schließvorgangs einer Düsennadel eines Einspritzventils
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DE112004001488D2 (de) * 2003-09-10 2006-07-27 Siemens Ag Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine
DE10343950B4 (de) * 2003-09-23 2014-12-31 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10353045A1 (de) * 2003-11-13 2005-06-23 Siemens Ag Kraftstoffeinspritzventil
DE102004005456A1 (de) * 2004-02-04 2005-08-25 Robert Bosch Gmbh Kraftstoffinjektor mit direktgesteuertem Einspritzventilglied
DE102004010668B4 (de) * 2004-03-04 2008-04-10 Sonplas Gmbh Verfahren und Vorrichtung zum Bearbeiten eines Bauteils
DE102004021920A1 (de) * 2004-05-04 2005-12-01 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102004031308B4 (de) * 2004-06-29 2013-05-23 Robert Bosch Gmbh Hydraulischer Koppler
DE102004035313A1 (de) * 2004-07-21 2006-02-16 Robert Bosch Gmbh Kraftstoffinjektor mit zweistufigem Übersetzer
DE102004037124A1 (de) * 2004-07-30 2006-03-23 Robert Bosch Gmbh Common-Rail-Injektor
DE102004044461A1 (de) * 2004-09-15 2006-03-30 Robert Bosch Gmbh Einspritzdüse
DE102004045393B4 (de) * 2004-09-18 2014-12-31 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102005015997A1 (de) * 2004-12-23 2006-07-13 Robert Bosch Gmbh Kraftstoffinjektor mit direkter Steuerung des Einspritzventilgliedes
DE102005026514B4 (de) * 2005-02-18 2008-12-24 Robert Bosch Gmbh Einspritzdüse
DE102005009148A1 (de) 2005-03-01 2006-09-07 Robert Bosch Gmbh Kraftstoffinjektor mit direktgesteuertem Einspritzventilglied mit Doppelsitz
DE102005015731A1 (de) * 2005-04-06 2006-10-12 Robert Bosch Gmbh Kraftstoffinjektor mit Piezoaktor
DE102005016796A1 (de) * 2005-04-12 2006-10-19 Robert Bosch Gmbh Zweistufig öffnender Kraftstoffinjektor
DE102005025141B3 (de) * 2005-06-01 2006-09-14 Siemens Ag Ventil
DE102005036444A1 (de) * 2005-08-03 2007-02-08 Robert Bosch Gmbh Einspritzdüse
DE102005054739B4 (de) * 2005-11-17 2017-06-08 Robert Bosch Gmbh Injektor zur Einspritzung von Kraftstoff in Brennräume von Brennkraftmaschinen, insbesondere piezoaktorgesteuerter Common-Rail-Injektor
DE102006019308A1 (de) * 2006-04-26 2007-10-31 Robert Bosch Gmbh Injektor
DE102006026397A1 (de) * 2006-06-07 2007-12-13 Robert Bosch Gmbh Vorrichtung zum Einspritzen von Kraftstoff
DE102006027327B4 (de) 2006-06-13 2018-08-02 Robert Bosch Gmbh Kraftstoffinjektor mit direkter Nadelsteuerung
DE102006036780A1 (de) * 2006-08-07 2008-02-21 Robert Bosch Gmbh Krafstoffinjektor mit direkter Nadelsteuerung und Servoventil-Unterstützung
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Also Published As

Publication number Publication date
ES2145446T3 (es) 2000-07-01
DE19519191A1 (de) 1996-12-19
WO1996037698A1 (fr) 1996-11-28
EP0828936B1 (fr) 2000-03-22
DE19519191C2 (de) 1997-04-10
DE59604782D1 (de) 2000-04-27

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