EP1553286A1 - Soupape de dosage avec une unité de compensation de longueur - Google Patents

Soupape de dosage avec une unité de compensation de longueur Download PDF

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Publication number
EP1553286A1
EP1553286A1 EP04106517A EP04106517A EP1553286A1 EP 1553286 A1 EP1553286 A1 EP 1553286A1 EP 04106517 A EP04106517 A EP 04106517A EP 04106517 A EP04106517 A EP 04106517A EP 1553286 A1 EP1553286 A1 EP 1553286A1
Authority
EP
European Patent Office
Prior art keywords
valve
unit
fluid
actuator unit
dosing
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
EP04106517A
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German (de)
English (en)
Other versions
EP1553286B1 (fr
Inventor
Bernhard Gottlieb
Oliver Hennig
Andreas Kappel
Tim Schwebel
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
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1553286A1 publication Critical patent/EP1553286A1/fr
Application granted granted Critical
Publication of EP1553286B1 publication Critical patent/EP1553286B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion

Definitions

  • the invention relates to a metering valve with actuator unit, Valve unit, fluid supply and length compensation unit.
  • PMA P iezoelektrischen M ultilayer ktors A
  • the coefficient of thermal expansion strongly depends on the state of polarization and the mechanical and electrical history of the PMA, as well as on the temperature itself in nonlinear dependence, and can have values in the range of -5 ⁇ 10 -6 1 / for one and the same PMA. K up to + 7 ⁇ 10 -6 1 / K.
  • the hydraulic compensation element consists of an oil-filled Hydraulic chamber, on the one hand by a cylinder housing and on the other by one in the form of a tight clearance fitted hydraulic piston is limited.
  • About the tight clearance and / or a throttle bore is the hydraulic chamber with a storage volume in connection.
  • the Storage volume serves on the one hand as a surge tank, in the or overflowed by the oil when the height of the hydraulic chamber changes and on the other hand as a compensator for the thermal volume change of the oil volume itself.
  • the storage space must have a previously set basic pressure over the Compensation path and the full temperature range as possible keep constant.
  • the entire oil volume must be hermetically sealed be enclosed and may contain no gas bubbles.
  • the compensation path for a hydraulic compensation element Among other things, the height of the hydraulic chamber limited in the axial direction and is in typical applications Max. ⁇ 200 ⁇ m.
  • the invention is based on the object, a length compensation unit with increased compared to the prior art Compensation path and much simpler structure to provide.
  • the invention is based on the recognition that a friction-based Compensation element (FK) for integration of maximum Functionality with given space conditions as Length compensation element can be used.
  • FK friction-based Compensation element
  • the special construction ensures the possibility of separate construction, Tests and the corresponding installation.
  • the invention riktionsbasetti F K ompensationselement is the known concepts H ompensatoren ydraulic K (HK) is superior in the following properties:
  • the installation space, in particular the length of an actuator is significantly reduced when using a FK compared to actuator with HK, as the HK must always connect to the actuator in length, while the FK only an additional pipe of small wall thickness is necessary, which is the actuator includes. Therefore, only a small additional space requirement arises in the diameter.
  • the safe return of the metering valve in the closed State or in the state of rest by means of a return spring happens through an appropriate force in the Valve unit is initiated.
  • the introduction can be direct on the valve unit or very beneficial on the FK the valve unit is done. So the closing force can be mechanical or hydraulically (by the FK) are applied, wherein Both parts add up to the closing force.
  • the mechanical Proportion that is applied by the return spring serves to secure the valve in the unpressurized state of the injector. Leakage of fluid from the injector can thus reliably prevented even when parked engine become.
  • an inert fluid which does not corrosive, used. This encloses the actor and binds it thermally to the outside.
  • a metal bellows is used for the separation between the under elevated Fluid pressure standing area of the valve unit of the with Lower pressure applied area of the actuator unit and as a feedthrough element for the valve needle of the actuator unit to the valve unit. Furthermore, to protect the metal bellows before pressure waves one between metal bellows and with Positioned fluid pressure applied area of the valve unit Training fit trained.
  • a friction-based compensation element (FK) for tolerance and length compensation for piezo drives will contain as fluid between the components involved a substance with a defined viscosity ⁇ . This viscosity is dependent in particular on the friction surface A.
  • a fluid with dilatant properties can be interposed.
  • the advantages in this case are also in the increase of the compensation path, which is essentially based on the mechanical construction method.
  • the necessary manufacturing accuracy for the components involved or for the filling with the lubricant make high demands on the production of such a bearing.
  • the design of a friction-based bearing is characterized by small gaps and by lengthy filling with a lubricant and very expensive.
  • a dilatant fluid unlike a highly viscous Newtonian fluid, has a significantly different behavior.
  • an increase in shear rate causes the viscosity to increase to solid-like properties.
  • the behavior of a dilatant substance corresponds to the requirements of the FK that slow processes such as the compensation of changes in length or component tolerances occur at a low shear rate.
  • slow processes such as the compensation of changes in length or component tolerances occur at a low shear rate.
  • Compensation element represents a further development and Optimization of the cited prior art with regard to the integration of maximum functionality in given space conditions as prescribed height, outside diameter and simple construction as a modular unit. This can be built separately, tested and installed.
  • the FK invention is the known concepts H ydraulic K ompensatoren (HK) in the following properties superior to:
  • the space, in particular the length of the piezo drive, is significantly reduced when using a FK compared to a piezo drive with HK, since the HK always has to connect in length to the piezo drive, while in FK only an additional tube of small wall thickness, which includes the actuator unit, is required. Therefore, only a small additional space requirement arises in the diameter. Building a FK is much easier than building a HK.
  • the FK only requires a tight cylinder fit.
  • the volume filled with a high viscosity oil does not have to be filled without gas bubbles.
  • An air pocket just serves to the thermal expansion of the volume of oil intercept.
  • the valve unit consists of a valve needle 1, whose lower end is formed according to the orientation in the figures in the form of a valve plate 2 and from a cartridge / sleeve 3, in the lower end of a valve seat 4 is ground, which together with the valve plate 2, a cone jet valve forms, wherein the jet cone angle of the exiting fuel by the geometric configuration of the valve plate 2 and the valve seat 4 are set.
  • the valve needle 1 is axially guided in the sleeve 3 by two very tight clearance fits 5.6.
  • the cross section of the valve needle 1 in the region of the lower fitting 5 has one or more flattenings, so that the fuel in the space between the valve needle and sleeve inner wall of the at least one inlet bore 7 during the injection process can flow freely to the open cone jet valve.
  • a metal bellows 8 is hermetically sealed at its lower end with the valve needle 1 and at its upper end hermetically sealed to the valve body 9 by welding.
  • BalganBankes causes the high-pressure fuel from the outside acts on the bellows.
  • the installation of metal bellows under external pressure loading is recommended by the bellows manufacturers as the more stable variant.
  • the metal bellows 8 serves as a high pressure resistant hermetically sealed, but axially soft feedthrough element that does not hinder the required movement of the valve needle 1 for fast opening and closing of the cone jet valve.
  • d 1 and d 2 an opening, closing or vanishing pressure-dependent force on the valve needle.
  • a path-independent closing force F R is introduced into the valve needle.
  • the valve body 9 is hermetically sealed with the sleeve 3 and pressure-stable preferably connected by welding.
  • valve unit is up to the state described so far Can be mounted as a separate unit and with the help of suitable Devices in their function testable, such. on Tightness of the welds, tightness of the cone jet valve, Training and characteristics of the cone beam, which costs Saves, as defective valve groups are immediately discarded can not and errors only at a complete injector be detected, thereby discarding the entire injector would have to be.
  • the actuator is composed of the P iezoelektrischen M ultilayer A ctor, PMA 12, which is welded under compression between a base plate 13 and a top plate 14 in a tube spring 15 °.
  • the compressive prestressing protects the PMA from damaging tensile stresses in highly dynamic operation.
  • the piezoceramic behaves stable against compressive stresses, tensile stresses, however, can lead to the destruction of the piezoceramic.
  • the effect of the gap suspension between the end faces of the PMA and the corresponding mating surfaces of the top plate 14 and bottom plate 13 is avoided by applying a strong compressive bias, typically from about 500 N - 1000 N, which leads to a soft, mechanical coupling of the top plate 14 and bottom plate 13 leads and therefore can be the cause of losses in the deflection of the actuator unit.
  • a strong compressive bias typically from about 500 N - 1000 N
  • causes of the occurrence of gap suspension are geometric deviations from the ideal plane-parallel geometry of the PMA end faces.
  • the faces are typically made with a tolerance in the parallelism of about ⁇ 50 ⁇ m.
  • the head plate 14 also contains holes 16 through which the electrical connections 17 of the PMA are led out centrally from the actuator unit.
  • the actuator unit can also be electrically and mechanically tested as a separate module before it is installed in an injector.
  • the length compensator consists in a preferred embodiment for use in the described metering valve of two concentric Tubes, the inner tube 18 and the outer tube 19, wherein the outer diameter of the inner tube 18 only slightly is smaller than the inner diameter of the outer tube 19, so that both tubes form a tight clearance.
  • a typical one Diameter difference is about 5 microns - 20 microns.
  • the fit gap is mixed with a high viscosity fluid, eg. B. Baysilone M 2 000 000 filled, whereby high shear forces between the Inner ear 18 and outer tube 19 at a minimum relative speed can be transmitted.
  • a high viscosity fluid eg. B. Baysilone M 2 000 000 filled, whereby high shear forces between the Inner ear 18 and outer tube 19 at a minimum relative speed can be transmitted.
  • Silicone oils such as. B.
  • Baysilone M results from the essential lower dependence of the viscosity on the temperature when comparing silicone oils with mineral oils in the relevant temperature range from -40 ° C to + 150 ° C, connected with the resulting simplified design of the length compensator.
  • the use of other high-viscosity Fluide is just as possible.
  • the inner tube 18 is rigidly connected to the top plate 14 of the actuator unit 32, for example, welded.
  • the outer tube 19 is connected at its lower end to the valve group rigid and high pressure tight.
  • the bottom plate 13 is rigidly connected to the upper end of the valve needle 1.
  • the interior of the outer tube 19 is to ensure permanent filling of the fit gap between the inner tube 18 and the outer tube 19 largely filled with highly viscous oil or with dilatant fluid. Furthermore, the filling serves at the same time for optimum loss heat dissipation from the PMA to the outer tube 19.
  • the fuel supply consists of an inlet connector / inlet fitting 26 with an inlet opening 20, into which the fuel is fed from the high-pressure pump via a fuel line.
  • the inlet opening opens into an annular groove 21, through which the fuel is distributed uniformly over the circumference.
  • the fuel supply is further provided by a jacket tube 22.
  • the cylindrical annular gap between the outer tube 19 and the jacket tube 22 serves as a fuel line from the inlet fitting 26 to the valve group.
  • the inlet fitting (26) is high pressure resistant and hermetically sealed to the upper end of the outer tube and the jacket tube.
  • the lower end of the jacket tube is high pressure resistant and hermetically sealed to the sleeve 3.
  • This type of concentric fuel delivery allows for optimum loss heat removal from the PMA via the inner tube 18, the silicone oil and the outer tube 19 to the fuel.
  • the elasticity of the outer and jacket tube is an efficient, injector-internal pressure accumulator, which optimally damps the pressure waves caused by the rapid opening and closing of the cone jet valve.
  • the inlet fitting 26 may be a mechanical device Injector calibration, consisting of a hollow screw 23, and a soft spring 24 located at the top of the hollow screw and supported at the bottom of the actuator, included.
  • a mechanical device Injector calibration consisting of a hollow screw 23, and a soft spring 24 located at the top of the hollow screw and supported at the bottom of the actuator, included.
  • the inner bore of the hollow screw 23 is used to carry out the electrical connections 17.
  • Means the seal 25 made of silicone or the like is the bore the hollow screw 23 is closed, so that the silicone oil filling safely trapped in the injector interior.
  • the function of the FK is based on the fact that the coupling by viscous friction allows to temporarily transmit high forces with high mechanical stiffness, whereby during the period of the force effect compared to the Aktorausschung only a negligible relative displacement between the tubes occurs.
  • the mechanical stiffness of the FK is determined by the mechanical stiffnesses of the two tubes. Very slow Relativverschiebitch between the tubes take place virtually free of forces. Therefore, the FK for use in short-term operating switching valves or periodically operating switching valves can be used, the phase of the power transmission compared to the Aktorausschung only leads to a negligible relative displacement between the tubes in the FK.
  • the viscosity ⁇ must be at least 965 Ns / m 2 .
  • high-viscosity oils such as Baysilone M 2 000 000 (trade name)
  • a viscosity of about 2000 Ns / m 2 is provided and the required minimum viscosity of 956 Ns / m 2 safely maintained under all operating conditions.
  • the PMA (12) is charged via the electrical connections (17), the PMA is extended and opens the cone jet valve, the closing force being taken over by the PMA.
  • the actuator unit is supported by the inner tube and the viscous friction on the outer tube.
  • the closing force via the viscous friction, causes the actuator unit to be pushed upwards at a constant speed relative to the outer tube during the opening period.
  • fuel in the form of a cone jet enters the combustion chamber through the opened cone jet valve.
  • the PMA is discharged again via the electrical connections 17, wherein the PMA is again contracted to the original length and the cone jet valve is closed by the closing force.
  • the return spring 10 supports the closing operation.
  • high viscosity fluids for the FK is not on Limited silicone oils. It can also be fats, tixotropic or also rheopex fluids are used.
  • the application of the FK is not based on piezoelectric Drives limited. It is equally beneficial in all types of solid state factors such. B. in magnetostrictive or electrostrictive actuators used.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP04106517A 2004-01-09 2004-12-13 Soupape de dosage avec une unité de compensation de longueur Expired - Fee Related EP1553286B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410001505 DE102004001505B4 (de) 2004-01-09 2004-01-09 Dosierventil mit Längenkompensationseinheit
DE102004001505 2004-01-09

Publications (2)

Publication Number Publication Date
EP1553286A1 true EP1553286A1 (fr) 2005-07-13
EP1553286B1 EP1553286B1 (fr) 2007-10-31

Family

ID=34585378

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04106517A Expired - Fee Related EP1553286B1 (fr) 2004-01-09 2004-12-13 Soupape de dosage avec une unité de compensation de longueur

Country Status (2)

Country Link
EP (1) EP1553286B1 (fr)
DE (2) DE102004001505B4 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005036826A1 (de) * 2005-08-04 2007-02-15 Siemens Ag Kraftstoffinjektor zur Ermittlung des Brennraumdrucks in einer Brennkraftmaschine
EP1816341A1 (fr) * 2006-02-03 2007-08-08 Siemens Aktiengesellschaft Unité d'actionnement pour buse d'injection et buse d'injection
US8763767B2 (en) 2004-07-07 2014-07-01 Continental Automotive Gmbh Electronic parking brake and method for controlling an electronic parking brake
BE1030754B1 (nl) * 2023-01-31 2024-02-27 Tatjana Yazgheche Hulpstukken bij het samenstellen van een doseerventiel

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005037419A1 (de) * 2005-08-08 2007-02-22 Siemens Ag Injektor zur Direktinjektion von brennbaren Fluiden
DE102011102170B4 (de) 2011-05-20 2024-06-06 Vitesco Technologies GmbH Einspritzvorrichtung zur Einspritzung eines Fluids
DE102019121679A1 (de) * 2019-08-12 2021-02-18 Vermes Microdispensing GmbH Dosiersystem mit justierbarem Aktor
DE102020120439A1 (de) 2020-08-03 2022-02-03 Focke & Co. (Gmbh & Co. Kg) Ventil für fließfähige Medien

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4763841A (en) * 1986-04-29 1988-08-16 Daimler-Benz Aktiengesellschaft Injection nozzle for injecting fuel into the combustion chamber of an air-compressing fuel-injection engine
DE19905340A1 (de) * 1999-02-09 2000-08-10 Siemens Ag Verfahren und Anordnung zur Voreinstellung und dynamischen Nachführung piezoelektrischer Aktoren
DE10035168A1 (de) * 2000-07-19 2002-02-07 Siemens Ag Stellantrieb, Ventil sowie Verfahren zum Herstellen eines Stellantriebs
WO2002038948A1 (fr) * 2000-11-13 2002-05-16 Siemens Vdo Automotive Corporation Compensateur magnetique-hydraulique pour injecteur de carburant
WO2002095214A1 (fr) * 2001-05-23 2002-11-28 Westport Research Inc. Soupape d'injection a commande directe equipee d'une aiguille ferromagnetique
WO2004085831A1 (fr) * 2003-03-26 2004-10-07 Siemens Aktiengesellschaft Soupape de dosage a unite de compensation de longueur

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19940055C1 (de) * 1999-08-24 2001-04-05 Siemens Ag Dosierventil
DE10039424A1 (de) * 2000-08-11 2002-02-28 Siemens Ag Dosierventil mit einem hydraulischen Übertragungselement
JP4288182B2 (ja) * 2002-04-22 2009-07-01 シーメンス アクチエンゲゼルシヤフト 流体のための調量装置、特に自動車用噴射弁

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4763841A (en) * 1986-04-29 1988-08-16 Daimler-Benz Aktiengesellschaft Injection nozzle for injecting fuel into the combustion chamber of an air-compressing fuel-injection engine
DE19905340A1 (de) * 1999-02-09 2000-08-10 Siemens Ag Verfahren und Anordnung zur Voreinstellung und dynamischen Nachführung piezoelektrischer Aktoren
DE10035168A1 (de) * 2000-07-19 2002-02-07 Siemens Ag Stellantrieb, Ventil sowie Verfahren zum Herstellen eines Stellantriebs
WO2002038948A1 (fr) * 2000-11-13 2002-05-16 Siemens Vdo Automotive Corporation Compensateur magnetique-hydraulique pour injecteur de carburant
WO2002095214A1 (fr) * 2001-05-23 2002-11-28 Westport Research Inc. Soupape d'injection a commande directe equipee d'une aiguille ferromagnetique
WO2004085831A1 (fr) * 2003-03-26 2004-10-07 Siemens Aktiengesellschaft Soupape de dosage a unite de compensation de longueur

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8763767B2 (en) 2004-07-07 2014-07-01 Continental Automotive Gmbh Electronic parking brake and method for controlling an electronic parking brake
DE102005036826A1 (de) * 2005-08-04 2007-02-15 Siemens Ag Kraftstoffinjektor zur Ermittlung des Brennraumdrucks in einer Brennkraftmaschine
DE102005036826B4 (de) * 2005-08-04 2007-04-26 Siemens Ag Kraftstoffinjektor zur Ermittlung des Brennraumdrucks in einer Brennkraftmaschine
EP1816341A1 (fr) * 2006-02-03 2007-08-08 Siemens Aktiengesellschaft Unité d'actionnement pour buse d'injection et buse d'injection
US8162240B2 (en) 2006-02-03 2012-04-24 Continental Automotive Gmbh Actor device for an injector and injector
BE1030754B1 (nl) * 2023-01-31 2024-02-27 Tatjana Yazgheche Hulpstukken bij het samenstellen van een doseerventiel

Also Published As

Publication number Publication date
DE102004001505B4 (de) 2005-11-10
EP1553286B1 (fr) 2007-10-31
DE502004005355D1 (de) 2007-12-13
DE102004001505A1 (de) 2005-08-04

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