EP0203274A1 - Elektrisch betätigbares Kraftstoffeinspritzventil für Brennkraftmaschinen - Google Patents

Elektrisch betätigbares Kraftstoffeinspritzventil für Brennkraftmaschinen Download PDF

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Publication number
EP0203274A1
EP0203274A1 EP86102634A EP86102634A EP0203274A1 EP 0203274 A1 EP0203274 A1 EP 0203274A1 EP 86102634 A EP86102634 A EP 86102634A EP 86102634 A EP86102634 A EP 86102634A EP 0203274 A1 EP0203274 A1 EP 0203274A1
Authority
EP
European Patent Office
Prior art keywords
fuel
injection valve
fuel injection
air flow
electrically actuated
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.)
Withdrawn
Application number
EP86102634A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jürgen Dr. Lange
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.)
Mannesmann VDO AG
Original Assignee
Mannesmann VDO 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 Mannesmann VDO AG filed Critical Mannesmann VDO AG
Publication of EP0203274A1 publication Critical patent/EP0203274A1/de
Withdrawn legal-status Critical Current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
    • F02M67/00—Apparatus in which fuel-injection is effected by means of high-pressure gas, the gas carrying the fuel into working cylinders of the engine, e.g. air-injection type
    • F02M67/10—Injectors peculiar thereto, e.g. valve less type
    • 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
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/48—Sonic vibrators

Definitions

  • the invention relates to an electrically actuated fuel injection valve for internal combustion engines according to the preamble of claim 1.
  • the main patent (patent application P ) is an electrically actuable fuel injection valve for internal combustion engines, which is characterized in that it has an electrode-provided piezoelectric oscillator with at least one fuel-receiving chamber and that the chamber is a fuel feed path and an injection opening in fuel are conductive connection, which are designed such that when a voltage is applied to the electrodes, the fuel is given a preferential movement through the chamber to the ejection opening.
  • a hollow cylindrical radial oscillator is specifically provided as the piezoelectric oscillator, in the wall of which a number of continuous, fuel-absorbing chambers are accommodated parallel and concentrically to a longitudinal axis of the radial oscillator.
  • the fuel injection valve is suitable without determining the preferred movement of the liquid fuel, namely the direction of injection, without an element that is movable in its entirety, in particular without a longitudinally displaceable valve needle, thereby metering the fuel quantity and creating the prerequisites for atomizing the fuel.
  • This is achieved in that the electrical field electrical when the voltage is applied to electrodes of the piezoelectric oscillator contracts or expands so that the volume of the fuel-receiving chamber changes, that with a reduction in volume of the chamber the fuel essentially out of the way. spray opening emerges while the fuel return flow through the fuel supply path is substantially throttled.
  • the fuel injection valve In general, in order to achieve an extensive air-fuel mixture, it is desirable for the fuel injection valve to generate an atomized fuel jet that is as wide as possible. In known fuel injection valves, attempts have been made to achieve this by various design measures, but the fuel jet is regularly injected into the surrounding volume in the longitudinal axis of the fuel injection valve. If, as in central injection systems, the fuel injection valve as a whole is in the air flow drawn in by the internal combustion engine, this air flow moves past the fuel injection valve on the outside and counteracts the desired expansion of the fuel jet due to its flow velocity.
  • the present invention is based on the problem of this deficiency in an electrically actuated fuel injection to remedy the valve with a piezoelectric, hollow-cylindrical radial-I oscillator of the type mentioned at the outset, ie to deliver an atomized fuel jet which is as widened as possible even when the fuel injection valve is in an air stream flowing around it.
  • a good mixing of the fuel and the supply air occurs, which is supplied as air flow through the passage line and as air flowing around the fuel injection valve in its entirety. It is essential that the ejection openings on the chambers, which are the same as their outlet openings, have air flowing around them on all sides, which is why the fuel injected into the air flow is mixed thoroughly. Since air flows around the fuel injection valve not only on the outside but also in its passage line, good cooling of the fuel injection valve is also achieved and vapor bubble formation in the fuel is reduced.
  • a particularly advantageous embodiment of the fuel injection valve is specified in claim 2, which is characterized by great compactness and good strength properties.
  • the block provided for mounting the ring vibrator, which also has the fuel feed path, is provided with a central through-bore, the wall of which is partially surrounded concentrically by the radial vibrator.
  • the through hole does not require any significant additional effort in the manufacture of the block.
  • an approximately frustoconical gap is preferably produced in connection with the chamfering of the through line or the through bore, in which the inner air flow is guided exactly, so that this occurs after the outlet largely expanded from the gap to this without strong vortex formation.
  • An essential part of an embodiment of the fuel injection valve according to FIGS. 1 and 2 is a hollow cylindrical radial oscillator 11 made of piezoelectric material.
  • a number of fuel-absorbing chambers 12, 12 ' are arranged between the inner wall and the outer wall.
  • the fuel-absorbing chambers are located in a neutral fiber of the radial oscillator and are designed as continuous bores with a constant diameter that are open at the top and bottom. They run parallel and concentric to the longitudinal axis 19.
  • the inner wall and the outer wall of the radial oscillator are each covered with an electrode, which is only indicated by the supply line 14 or 15.
  • the lower side of the fuel-receiving chambers 12, 12 ' is opposite an annular diaphragm 16 which has holes 17, 17' which are aligned with the chambers and determine the droplet size.
  • the radial oscillator and the ring diaphragm are mounted in a block 18 so that the ring diaphragm 16 with the bores 17, 17 'or the chambers of the radial oscillator 11 can inject fuel downwards.
  • the fuel feed path to the ring oscillator is largely arranged in the upper part of the rigid block, which is rotationally symmetrical about the longitudinal axis 19 and is preferably made of metal.
  • the fuel feed path essentially consists of an annular constant volume chamber 20, into which a fuel inlet connection 21 and a fuel outlet connection 22 open.
  • the free cross sections of the connecting pieces 21 and 22 are small compared to the surface of the inner wall of the constant volume chamber.
  • the radial oscillator 11 is inserted in a ring-shaped recess 23 of the block 18 with seals 24-26 sealed.
  • An upper cover 28 covers the block 18, in particular above the constant volume chamber 20, so that it is closed to this extent.
  • a through hole 29 extends through the cover 28 and the block 18 and is arranged centrally to the longitudinal axis 19.
  • a wall 30 is formed between the through hole and the radially outer parts, the constant volume chamber 20 and the annular recess 23. Since the block is preferably made of metal, the wall 30 is a good heat conductor.
  • the through hole has a chamfer of the shape that can be seen in FIGS. 1 and 2 and that widens conically outwards.
  • the embodiment according to FIG. 2 differs from that according to FIG. 1 by an additional cone 32, the conical surface of which preferably has a chamfer 31 essentially forms an annular gap, the shape of which is shown in detail in FIG. 2.
  • the cone 32 is held in position relative to the block 18, for which purpose a lower plate 33 can be used.
  • the volume of the chambers 12, 12 'in the ring oscillator changes.
  • the fuel flowing into these fuel receiving chambers from the constant volume chamber 20 is essentially injected downwards through the bores 17, 17 'of the ring diaphragm 16 into the volume surrounding the fuel injection valve.
  • the preferred direction of movement 27 of the fuel thus runs as indicated by the arrow marked accordingly.
  • the fuel-absorbing chambers 12, 12 'can therefore be designed as a through hole for ease of production.
  • the leads 14, 15 are led out of the block 18 to a plug connection, not shown, via which a controlled electrical voltage can thus be supplied to the radial oscillator.
  • the valve is flowed around by supply air - from top to bottom in the drawing.
  • Part of the supply air is led through the through hole 29 with a main flow direction, which is indicated by an arrow 34.
  • the internal supply flow widens outwards, as indicated by the arrows 35.
  • This widened internal supply air flow also entrains the atomized fuel injected into the space of the supply air flow, which initially emerges from the bores 17, 17 'of the ring orifice 16 with the preferred direction of movement 27.
  • the fuel mixes intensely with the supply air flow, the mixture expanding further outwards.
  • the chamfer 31 in FIG. 1 and in an even more effective manner through the cone 32 in FIG. 2 at most a slight undesirable eddy formation occurs in the area of the ring diaphragm and the adjacent surfaces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP86102634A 1985-05-13 1986-02-28 Elektrisch betätigbares Kraftstoffeinspritzventil für Brennkraftmaschinen Withdrawn EP0203274A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3517257 1985-05-13
DE19853517257 DE3517257A1 (de) 1985-05-13 1985-05-13 Elektrisch betaetigbares kraftstoffeinspritzventil fuer brennkraftmaschinen

Publications (1)

Publication Number Publication Date
EP0203274A1 true EP0203274A1 (de) 1986-12-03

Family

ID=6270642

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86102634A Withdrawn EP0203274A1 (de) 1985-05-13 1986-02-28 Elektrisch betätigbares Kraftstoffeinspritzventil für Brennkraftmaschinen

Country Status (4)

Country Link
US (1) US4697738A (ja)
EP (1) EP0203274A1 (ja)
JP (1) JPS61261656A (ja)
DE (1) DE3517257A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192935A (en) * 1986-07-23 1988-01-27 Bosch Gmbh Robert Ultrasonic atomiser
EP0204068B1 (de) * 1985-05-13 1988-06-15 VDO Adolf Schindling AG Elektrisch betätigbares Kraftstoffeinspritzventil für Brennkraftmaschinen

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3833093A1 (de) * 1988-09-29 1990-04-12 Siemens Ag Fuer verbrennungskraftmaschine vorgesehene kraftstoff-einspritzduese mit steuerbarer charakteristik des kraftstoffstrahls
DE19654782C1 (de) * 1996-12-31 1998-05-20 Dualon International S A Einspritzinjektor für Dieselmotoren
US7061161B2 (en) 2002-02-15 2006-06-13 Siemens Technology-To-Business Center Llc Small piezoelectric air pumps with unobstructed airflow
DE102007013628A1 (de) * 2007-03-19 2008-09-25 Wurz, Dieter, Prof. Dr.-Ing. Rücklaufdüsen mit Druckluftunterstützung
SE531084C2 (sv) * 2007-04-24 2008-12-16 Maxit Group Ab Bruksprutningsanordning och metod
JP2014091311A (ja) * 2012-11-06 2014-05-19 Bhs Corrugated Machinen Und Anragenbau Gmbh 段ボール製造用の段ロール

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829015A (en) * 1972-06-22 1974-08-13 Combustion Equipment Ass Inc Acoustic nozzle

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2908443A (en) * 1949-06-07 1959-10-13 Fruengel Frank Ultrasonic carburetor
US2907648A (en) * 1955-09-30 1959-10-06 Nordberg Manufacturing Co Method of vaporizing a fuel
US4372491A (en) * 1979-02-26 1983-02-08 Fishgal Semyon I Fuel-feed system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829015A (en) * 1972-06-22 1974-08-13 Combustion Equipment Ass Inc Acoustic nozzle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, Band 8, Nr. 43 (M-279)[1480], 24. Februar 1984; & JP - A - 58 200 068 (NIPPON DENKI K.K.) 21-11-1983 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0204068B1 (de) * 1985-05-13 1988-06-15 VDO Adolf Schindling AG Elektrisch betätigbares Kraftstoffeinspritzventil für Brennkraftmaschinen
GB2192935A (en) * 1986-07-23 1988-01-27 Bosch Gmbh Robert Ultrasonic atomiser
GB2192935B (en) * 1986-07-23 1990-03-07 Bosch Gmbh Robert Ultrasonic atomiser

Also Published As

Publication number Publication date
JPS61261656A (ja) 1986-11-19
US4697738A (en) 1987-10-06
DE3517257A1 (de) 1987-01-15

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Inventor name: LANGE, JUERGEN, DR.