EP0828936B1 - Injection valve - Google Patents

Injection valve Download PDF

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Publication number
EP0828936B1
EP0828936B1 EP96914853A EP96914853A EP0828936B1 EP 0828936 B1 EP0828936 B1 EP 0828936B1 EP 96914853 A EP96914853 A EP 96914853A EP 96914853 A EP96914853 A EP 96914853A EP 0828936 B1 EP0828936 B1 EP 0828936B1
Authority
EP
European Patent Office
Prior art keywords
nozzle needle
injection valve
characterised
accordance
tappet
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.)
Expired - Lifetime
Application number
EP96914853A
Other languages
German (de)
French (fr)
Other versions
EP0828936A1 (en
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
Priority to DE1995119191 priority Critical patent/DE19519191C2/en
Priority to DE19519191 priority
Application filed by Siemens AG filed Critical Siemens AG
Priority to PCT/DE1996/000818 priority patent/WO1996037698A1/en
Publication of EP0828936A1 publication Critical patent/EP0828936A1/en
Application granted granted Critical
Publication of EP0828936B1 publication Critical patent/EP0828936B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/06Other fuel injectors peculiar thereto
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603Injectors peculiar thereto with means directly operating the valve needle using piezo-electric or magnetostrictive operating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/704Linkage 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

Description

The invention relates to an injection valve according to the preamble of claim 1.

Such an injection valve is, for example, by EP-A 0 531 533 known. This publication deals with one Diesel injection device with a high-pressure system (common rail system), where the fuel is a high pressure accumulator is fed via a high pressure pump. This one under high Pressurized fuel is then controlled the individual cylinders of a diesel engine via injectors fed. The injectors each controlled by a solenoid valve, for example also enable individual injection times.

In particular, to get injectors with which too a pre-injection is possible to reduce consumption, exhaust gas values, The injectors are said to improve noise, etc. can be switched quickly at high injection pressures. At high storage pressures when using a solenoid valve a pre-injection difficult because the switching times of the Solenoid valve are too long and the full stroke of the valve must be run through so that reproducible conditions, for example the injection quantity can be achieved. Moreover is the formation of the injection rate, i.e. slow opening, however, quickest closing of the nozzle needle, the shaping the injection rate according to a map can hardly be possible.

A piezoelectrically actuated injection valve is known from US-A-5 335 861.

It is an object of the present invention to provide an injection valve to provide, which can be switched extremely quickly.

This object is solved by claim 1. Beneficial Further training is characterized in the subclaims.

Because the nozzle needle is practically direct through the piezo actuator is actuated, the fastest possible actuation of the Nozzle needle achieved.

In the following, the invention is illustrated by an illustration explained.

The illustration shows an injection valve in section.

The injector shown in the figure consists of an elongated housing 5, one on its lower end Union nut 3 is screwed on. With this cap nut 3 is an intermediate washer from the lower end of the housing 5 4 and a nozzle body 1, in which a nozzle needle 2 is kept. The washer 4 and the nozzle body 1 have a center hole in which the nozzle needle 2 is guided displaceably in the axial direction. In the housing 5 a stepped plunger 7 is guided in the axial direction abuts the nozzle needle 2 at one end and at the other end with a secondary piston 14 of the piezoelectric drive device connected is. In the area of grading Ram 7 is a first pressure chamber 8 is provided, which an inlet bore 9 with a fuel inlet connection 10 connected is. This high pressure inlet port 10 is also via an inlet bore 6 with a second pressure chamber 11 connected, in whose area the nozzle needle 2 is stepped, whereby a control surface for controlling the nozzle needle 2 is formed.

As described above, the tappet 7 has a secondary piston 14 in connection, which is guided in a primary piston is. A piezo actuator 20 acts on the primary piston is stored in a closure 21 and opposite the actuator housing 12 is sealed by means of an O-ring 22. In The closure 21 is in the axial direction by means of a locking ring 24 secured. Electrical connections 23 are for Actuator 20 out.

The piezo actuator 20 acts on the primary piston 19 Disc spring 13. Next is in the recess of the secondary piston a spring 15 is provided which on an inner surface of the Primary piston 19 presses.

The injector also has several at low pressure standing bores or rooms. So there is a room 16 in the area between the plunger 7 and one end of the nozzle needle 2. This space 16 is over a leakage hole 27 and 29 with a return 25 in connection. The Piezo Actuator-20 is arranged in a leakage space 26, which is also in the Return flows. This space 26 continues through a relief bore 18 in connection with a room 17, in which the spring 15 is arranged. The work area 28 in the area the plate spring 13 is always full of fuel, the due to the play between the upper area of the plunger 7 and the housing 5 penetrates into this space.

The effective areas for printing are closed Nozzle designed so that the ring surface on the plunger 7 somewhat is smaller than the ring area on the pressure shoulder of the Nozzle needle 2. It therefore remains even when the nozzle is closed Nozzle needle 2 always has a resulting compressive force acts above, but is such that it depends on the spring force of the spring 15 is exceeded, whereby the nozzle needle 2 safely on their seat is pressed. In this position there is no Injection. The mentioned effective diameter of the ram 7 and the nozzle needle 2 are designed so that the Spring 15 designed for acceptable, small forces can be. However, the spring force must be so great that the Nozzle needle 2 quickly enough at the end of the injection Seat can be pressed. It should be borne in mind that them up during the injection of the nozzle seat works. A quick closing of the nozzle needle has an effect favorably on the exhaust gas values of the internal combustion engine.

A piezo actuator offers the possibility of faster switching operations to realize as an electromagnet. Problematic are the small ways that a piezo actuator makes and therefore have to be translated.

How the piezo actuator works on the injector is the following:

The plunger 7 to the housing 5 and the secondary piston 14 to Primary piston 19 and the primary piston 19 to the actuator housing 12 are paired with fits. The fits however, only represent a gap seal, so that a small Amount of fuel constantly from the inlet 10 through the pressure chamber 8 can lick along the plunger 7. One part of the leak goes towards the nozzle needle 2 and must pass through the leakage holes 29 and 27 are fed to the return. The other part of the leak arrives in the work space 28 and keeps it filled. Leakage fuel with excess flow passes on Secondary piston 14 along the relief bore 18 in the leakage space 26 and from there to the return line 25. The work space 28 is therefore always full of fuel. The Disc spring 13 presses the primary piston 19 with a defined one Biasing force against the piezo actuator 20 without play in the Starting position. In the starting position (rest position) the plunger 7 from the spring 15 via the secondary piston 14 after pressed down (no injection in this state). At Current supply to the piezo actuator 20 expands downward and moves the primary piston 19 against the force of the plate spring 13 also down. The volume of liquid in the Working space 28 is displaced and guides the secondary piston 14 with the plunger upwards, causing the nozzle needle 2 due the resulting pressure force is moved upwards. Hereby the start of injection is triggered.

This construction of the piezo actuator with the two pistons ensures that the plunger 7 and thus the nozzle needle 2 always be moved from a defined starting position. For the movement of the nozzle needle 2 is only the dynamics of the Secondary piston 14 with the tappet 7 decisive and not the Dynamics of hydraulics like in known systems with valves. All thermal expansions are compensated. The work space is always full. The piezo actuator is practically always excited about the same preload.

The return 25 is relieved to low pressure. As a piezo actuator Piezostacks are preferred which operate with relieve relatively small voltages in the vehicle.

Claims (7)

  1. Injection valve for fuel injection systems with a nozzle needle (2) arranged in a valve housing (1) and an associated seat, which can at least open and close an injection opening of the injection valve,
    a fuel inlet (10) which is hydraulically connected via a first pressure chamber (8) with a first control surface of the tappet (7) which drives the nozzle needle (2), and via second pressure chamber (11) with a second control surface of the nozzle needle (2),
    with the first control surface being larger than the second control surface and the first control surface which applies pressure to the nozzle needle (2) in the direction of the associated seat and applies pressure to the second control surface of the nozzle needle which lifts the nozzle needle (2) from the seat,
    a control device which is hydraulically transmitted via a primary and secondary piston (14, 19) and which controls the nozzle needle (2),
    characterised in that the control device has piezo-actuator (20), that the piezo-actuator (20) directly drives the primary piston (19) and that the nozzle needle (2) can be directly driven via the tappet (7) and the secondary piston (14).
  2. Injection valve in accordance with Claim 1, characterised in that the secondary piston (14) is permanently connected to the tappet (7) and pre-loaded against the primary piston (19) by means of a spring (15).
  3. Injection valve in accordance with Claims 1 and 2, characterised in that the spring (15) pre-loads the secondary piston (14) in the direction of the nozzle needle (2).
  4. Injection valve in accordance with Claim 1, characterised in that the control surfaces are formed by annular surfaces and one of the annular surfaces of the tappet (7) is somewhat smaller than the other annular surface at the pressure shoulder of the nozzle needle (2), so that a resulting force always remains in the direction of the driving device.
  5. Injection valve in accordance with Claim 4, characterised in that the resulting force is less than the force exerted by the spring (15), so that the nozzle needle (2) is always pressed against its seat when the control device is inactive.
  6. Injection valve in accordance with Claim 1, characterised in that the working chamber (28) formed between the primary piston (19) and secondary piston (14) is always filled by a leakage flow of the injection valve.
  7. Injection valve in accordance with Claim 6, characterised in that clearances are provided between the tappet (7) and the housing (5), between the primary piston (19) and secondary piston (14) and also between the primary piston (19) and the housing (12), which are arranged so that a slight leakage always takes place between them, so that the working chamber (28) is always filled with liquid and in the event of thermal expansion the piezo-actuator has a clearance-compensated, pressure pre-loaded and clearly-defined starting position before an electrical voltage is applied.
EP96914853A 1995-05-24 1996-05-11 Injection valve Expired - Lifetime EP0828936B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE1995119191 DE19519191C2 (en) 1995-05-24 1995-05-24 Injector
DE19519191 1995-05-24
PCT/DE1996/000818 WO1996037698A1 (en) 1995-05-24 1996-05-11 Injection valve

Publications (2)

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

Family

ID=7762838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96914853A Expired - Lifetime EP0828936B1 (en) 1995-05-24 1996-05-11 Injection valve

Country Status (4)

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

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Publication number Priority date Publication date Assignee Title
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 (en) * 1997-06-20 1999-04-15 Telefunken Microelectron Fuel injection method
DE19727992C2 (en) * 1997-07-01 1999-05-20 Siemens Ag Compensation element for compensation of temperature-related changes in length of electromechanical control systems
DE19742943C1 (en) * 1997-09-29 1999-04-22 Siemens Ag Coupling device between actuator and valve setting element
DE19817320C1 (en) * 1998-04-18 1999-11-11 Daimler Chrysler Ag Injector for fuel injection systems
DE19839125C1 (en) * 1998-08-27 2000-04-20 Siemens Ag Device and method for dosing fluid
DE19843578A1 (en) * 1998-09-23 2000-03-30 Bosch Gmbh Robert Fuel injection valve especially for fuel injection installations of IC engines has longitudinal axis along which actuator exerts operating force displaced but parallel with respect to longitudinal axis of valve needle
DE19857338C1 (en) * 1998-12-11 2000-10-05 Siemens Ag Dosing arrangement for direct fuel injector
DE19858758C1 (en) 1998-12-18 2000-09-07 Siemens Ag Stroke transmission device and method
DE19907931A1 (en) * 1999-02-24 2000-09-14 Siemens Ag Dosing device for controlling combustion processes with common rail fuel injection system
DE19914714C2 (en) * 1999-03-31 2001-09-20 Siemens Ag Injector for storage fuel injection systems
EP1046809B1 (en) 1999-04-20 2005-08-10 Siemens Aktiengesellschaft Fluid metering device
DE19942816A1 (en) * 1999-09-08 2001-03-22 Daimler Chrysler Ag Injection valve has hydraulic conversion unit with hollow volume bounded by larger area membrane associated with control element and smaller area one associated with valve element
DE19956830C2 (en) * 1999-11-25 2002-07-18 Siemens Ag execution
DE10007735A1 (en) * 2000-02-19 2001-09-06 Daimler Chrysler Ag Fuel injection valve for IC engines has pressure-reducing throttle between high-pressure fuel in fuel chamber/line and lower pressure fuel in valve needle actuator area
DE10029629A1 (en) * 2000-06-15 2002-01-03 Bosch Gmbh Robert Fuel injection device for internal combustion engines
DE10042231B4 (en) * 2000-08-28 2004-09-30 Siemens Ag Injection valve for injecting fuel into an internal combustion engine and method for controlling the opening and closing process of a nozzle needle of an injection valve
DE10133265A1 (en) * 2001-07-09 2003-01-23 Bosch Gmbh Robert Fuel injection valve with piezoelectric or magnetostrictive actuator, has hydraulic coupling valve closure body and seat surface urged pressed together by spring
DE10326046A1 (en) * 2003-06-10 2004-12-30 Robert Bosch Gmbh Injection nozzle for internal combustion engines
DE112004001488D2 (en) * 2003-09-10 2006-07-27 Siemens Ag Injection valve for injecting fuel into an internal combustion engine
DE10343950B4 (en) * 2003-09-23 2014-12-31 Robert Bosch Gmbh Fuel injector
DE10353045A1 (en) * 2003-11-13 2005-06-23 Siemens Ag Fuel injection valve
DE102004005456A1 (en) * 2004-02-04 2005-08-25 Robert Bosch Gmbh Fuel injector with direct-acting injection valve member
DE102004010668B4 (en) * 2004-03-04 2008-04-10 Sonplas Gmbh Method and device for processing a component
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DE102004031308B4 (en) * 2004-06-29 2013-05-23 Robert Bosch Gmbh Hydraulic coupler
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DE102004044461A1 (en) * 2004-09-15 2006-03-30 Robert Bosch Gmbh injection
DE102004045393B4 (en) * 2004-09-18 2014-12-31 Robert Bosch Gmbh Fuel injector
DE102005015997A1 (en) * 2004-12-23 2006-07-13 Robert Bosch Gmbh Fuel injector with direct control of the injection valve member
DE102005026514B4 (en) * 2005-02-18 2008-12-24 Robert Bosch Gmbh injection
DE102005009148A1 (en) 2005-03-01 2006-09-07 Robert Bosch Gmbh Fuel injector with direct-acting injection valve member with double seat
DE102005015731A1 (en) * 2005-04-06 2006-10-12 Robert Bosch Gmbh Fuel injector with piezo actuator
DE102005016796A1 (en) * 2005-04-12 2006-10-19 Robert Bosch Gmbh Two-stage fuel injector
DE102005025141B3 (en) * 2005-06-01 2006-09-14 Siemens Ag Valve, e.g. for dosing liquid, has controllable transfer element of variable expansion in length in the transfer path between actuator and valve needle
DE102005036444A1 (en) * 2005-08-03 2007-02-08 Robert Bosch Gmbh injection
DE102005054739B4 (en) * 2005-11-17 2017-06-08 Robert Bosch Gmbh Injector for injecting fuel into combustion chambers of internal combustion engines, in particular piezoactuator-controlled common rail injector
DE102006019308A1 (en) * 2006-04-26 2007-10-31 Robert Bosch Gmbh Injector for fuel supply to internal combustion engine, especially in motor vehicle, has piezoactuator with foot on end remote from nozzle needle with sealing profile facing needle that contacts seal seat on injector body
DE102006026397A1 (en) * 2006-06-07 2007-12-13 Robert Bosch Gmbh Device for injecting fuel
DE102006027327B4 (en) 2006-06-13 2018-08-02 Robert Bosch Gmbh Fuel injector with direct needle control
DE102006036780A1 (en) * 2006-08-07 2008-02-21 Robert Bosch Gmbh Fuel injector with direct needle control and servo valve support
JP4333757B2 (en) 2007-03-13 2009-09-16 株式会社デンソー Fuel injection valve
DE102007019528B3 (en) * 2007-04-25 2008-09-11 Siemens Ag Pressure compensated injection valve with hydraulic converter has valve needle, actuator with different sized surfaces bounding hydraulic chambers; when actuator is operated hydraulic fluid passes between chambers via balancing chamber(s)
JP2009062910A (en) * 2007-09-07 2009-03-26 Denso Corp Fuel injection valve
EP2083158A1 (en) * 2008-01-22 2009-07-29 Delphi Technologies, Inc. Piezoelectrically actuated fuel injector and operating method thereof
DE102008002412A1 (en) 2008-06-13 2009-12-17 Robert Bosch Gmbh Fuel injector for injecting fuel into e.g. direct-injection diesel engine, has actuator coupled with nozzle needle, where actuator and head pistons on one side and needle and slave piston on another side exhibit different stroke axis
DE102008040086A1 (en) 2008-07-02 2010-01-07 Robert Bosch Gmbh Injector for injecting fuel into combustion chamber of internal combustion engine, has injection valve element for closing or releasing injection opening, and actuator for actuating injection valve element
DE102008035087B4 (en) * 2008-07-28 2015-02-12 Continental Automotive Gmbh Injector
DE102010040938A1 (en) * 2010-09-17 2012-03-22 Robert Bosch Gmbh Fuel injector
DE102011088282A1 (en) * 2011-12-12 2013-06-13 Continental Automotive Gmbh Injector
GB201515892D0 (en) * 2015-09-08 2015-10-21 Delphi Int Operations Lux Srl Hydraulic lash adjuster arranged in a servo injector

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DE4306073C1 (en) * 1993-02-26 1994-06-01 Siemens Ag Metering system for dosing of fluids with injection valve for IC engine - has piston acting on closing unit, and spring with actuator acting on large dia. piston moving in cylinder

Also Published As

Publication number Publication date
EP0828936A1 (en) 1998-03-18
DE19519191C2 (en) 1997-04-10
DE19519191A1 (en) 1996-12-19
ES2145446T3 (en) 2000-07-01
WO1996037698A1 (en) 1996-11-28

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