EP0042915B1 - Kraftstoffeinspritzventil für Brennkraftmaschinen - Google Patents

Kraftstoffeinspritzventil für Brennkraftmaschinen Download PDF

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Publication number
EP0042915B1
EP0042915B1 EP81102371A EP81102371A EP0042915B1 EP 0042915 B1 EP0042915 B1 EP 0042915B1 EP 81102371 A EP81102371 A EP 81102371A EP 81102371 A EP81102371 A EP 81102371A EP 0042915 B1 EP0042915 B1 EP 0042915B1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel
valve needle
supporting body
induction coil
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
Application number
EP81102371A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0042915A3 (en
EP0042915A2 (de
Inventor
Odon Dipl.-Ing. Kopsé
Karl Hofmann
Bernhard Dipl.-Ing. Kaczynski
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0042915A2 publication Critical patent/EP0042915A2/de
Publication of EP0042915A3 publication Critical patent/EP0042915A3/de
Application granted granted Critical
Publication of EP0042915B1 publication Critical patent/EP0042915B1/de
Expired 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • the start of injection of a fuel injection system is only measured at the injection valve itself. For this reason, considerable efforts are made to develop sensors that are located directly on the injection valve. Because of the slim design and the small strokes of the moving parts in the injection valve, it is much more difficult to measure the start of injection on or in the injection valve itself than, for example, on the injection pump.
  • the guide body coupled to the valve needle is designed as a core pin, which is immersed in a central bore in the induction coil, through which the incoming fuel also passes. In this version, the force is applied.
  • high-pressure fabric also the bushings of the electrical induction coil connections through the valve carrier, so that special care must be taken to avoid leaks.
  • an induction coil is arranged in a space separate from the fuel-filled interior of the injection valve, the valve needle having an extension provided with a permanent magnet, which extends from the fuel-filled interior into the through a bushing
  • the main area of the induction coil is:
  • a fuel injection valve with an induction coil for detecting the valve needle movement (FR-A No. 2320557), in which the induction coil is attached to the end face of the valve carrier facing away from the VentiInadel.
  • This version also takes up more space than a conventional injection valve of the generic type and requires a special design with the fuel being fed from the side.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the injection valve can be implemented without changing the external shape and dimensions of standard injection valves. Nevertheless, the induction coil is completely separated from the fuel flow path, so that an absolutely tight and compact design can be achieved.
  • FIG. 1 shows a first exemplary embodiment of the invention on the basis of a section of a fuel injection valve that opens outwards under the action of fuel pressure
  • FIG. 2 shows an embodiment modified in comparison therewith.
  • a fuel injection valve is shown in longitudinal section with a valve body 2, which is associated with an outwardly opening valve needle 3.
  • a compression spring 7 is clamped between a flange-shaped part 4 of the valve body and a spring plate in the form of a stop sleeve 5, by means of which the valve needle is held in the closed position.
  • the stop sleeve 5 is coupled to the head-like end 9 of the valve needle via a retaining ring 8.
  • the valve needle head 9 is carried out through an insertion hole, not shown, through the retaining ring and, after being carried out, is brought into a latching position.
  • the retaining ring 8 protrudes beyond the valve needle head 9 and forms a ring 11 there, the end face 12 of which is perpendicular to the axis of the valve needle 3 and forms a parallel gap 14 with the end face 15 of an adjoining connecting piece 17.
  • This connecting piece 17 is screwed into a sleeve-shaped valve support 18 and lies on the outer edge of the end face 15 via a spacer ring 19 close to a shoulder 20 on the inside of the valve support, so that a fuel-filled interior 22 is sealed between the flange part 4 and the end face 15.
  • the valve body 2 is pressed tightly over the flange part 4 by means of a union nut 23 onto the end face of the valve carrier 18.
  • the stop sleeve 5 has a guide part 25 which comprises a fitting piece 26 of the valve needle.
  • the connecting piece has a connecting thread 27 for connecting a high-pressure pipeline and an inlet bore 28 which opens into the interior 22 at the end face 15 of the connecting piece.
  • the entire connecting piece 17 is made of magnetizable material such as soft iron and is connected to the valve support 18 via a screw thread 35.
  • an induction coil 37 is arranged in a recess 36 on the circumference of the connecting piece 17, the connecting wires 38 of which are directed outwards through a groove 39 provided in the area of the screw thread 35 in the connecting piece to be led.
  • a fuel flow valve When the induction coil is excited by a constant current, a fuel flow valve generates a magnetic flux from a known constant current source of an evaluation device 46, which need not be shown further here. This leads to the formation of a magnetic circuit from the connecting piece via the valve carrier 18 and from there the induction coil 37 leads onward further across the valve body, the valve needle 3, the retaining ring 8 and the gap 14 back to the connecting piece 17. It is also very important that the magnetic flux also reaches the retaining ring 8 with a shorter connection via the narrow gap 40 formed between the retaining ring and the valve carrier radially surrounding it.
  • the gap 14 increases, so that the resistance in the magnetic circuit is increased and a change in magnetic flux is generated.
  • This causes a corresponding induction voltage in the induction coil 37, which is connected to the evaluation device via the connecting wires.
  • the retaining ring provided here offers the possibility of realizing a relatively large area penetrated by the magnetic flux.
  • the outer dimensions of standard fuel injection valves can be maintained without a needle stroke transmitter or injection start sensor.
  • the configuration enables the formation of a defined magnetic circuit.
  • the spacer ring 19 which also serves as a sealing ring, so that the change in the magnetic flux essentially exclusively results from the valve needle movement or the retaining ring 8 takes place.
  • the second exemplary embodiment according to FIG. 2 is constructed essentially the same as the exemplary embodiment according to FIG. 1. Deviating from this, the connecting piece 17 and the valve carrier 18 according to the exemplary embodiment according to FIG. 1 are combined in one piece, as valve carrier 18 ', so that the Screw-in thread 35 in FIG. 1 is omitted.
  • This valve carrier 18 ' is made entirely of magnetically conductive material, e.g. Soft iron, manufactured and designed in the same way sleeve-shaped, with one end sitting on the flange part 4 of the valve body, which is held with the flange part 4 by means of a union nut 33 screwed to the valve carrier 18 '.
  • magnetically conductive material e.g. Soft iron
  • valve carrier 18 On the connection side, the valve carrier 18 'has a longitudinal bore 42, in which an approximately rod-shaped insert 43 made of a likewise magnetically conductive material is inserted.
  • the end of the insert part facing the interior 22 is radially surrounded by a spacer ring 19 'which, in a graduated manner, also surrounds the ring 11 of the retaining ring 8 in a radially contactless manner and consists of magnetically non-conductive material.
  • the insert 43 In an analogous manner to the connecting piece 17, the insert 43, together with the spacer ring 19 ', closes off the interior 22 at the end at the end opposite the valve body 2, the end face 15' forming a gap 14 perpendicular to the axis of the valve needle or parallel to the end face 12 of the retaining ring 8 lies.
  • the insert 43 At the connection-side end and at the interior-side end of the insert 43, the insert 43 is tightly connected to the valve support 18 ', the tight connection e.g. can be made by electron beam welding.
  • the interior is sealed tightly, e.g. B by welding the spacer ring 19 'to the insert on the one hand and the valve carrier 18' on the other.
  • the induction coil 37 is in turn arranged between the welding points on the insert 43 on the outer circumference of the insert part 43, the connecting wires 38 of the induction coil being guided to the outside via an opening 45 provided in the valve carrier 18 '.
  • the inlet bore 28 runs inside the insert.
  • the fuel injector described has essentially the same properties as the valve described in the previous example.
  • the screw-in thread and the fitting of a spacer ring 19 and the sealing of the interior 22 are advantageously omitted here. Overall, the fuel valve is easier to manufacture and assemble, with the sealing problems e.g. are controllable by electron welding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP81102371A 1980-06-28 1981-03-28 Kraftstoffeinspritzventil für Brennkraftmaschinen Expired EP0042915B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3024424 1980-06-28
DE19803024424 DE3024424A1 (de) 1980-06-28 1980-06-28 Kraftstoffeinspritzventil fuer brennkraftmaschinen

Publications (3)

Publication Number Publication Date
EP0042915A2 EP0042915A2 (de) 1982-01-06
EP0042915A3 EP0042915A3 (en) 1982-06-30
EP0042915B1 true EP0042915B1 (de) 1984-07-11

Family

ID=6105797

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81102371A Expired EP0042915B1 (de) 1980-06-28 1981-03-28 Kraftstoffeinspritzventil für Brennkraftmaschinen

Country Status (3)

Country Link
EP (1) EP0042915B1 (enrdf_load_stackoverflow)
JP (1) JPS5732052A (enrdf_load_stackoverflow)
DE (2) DE3024424A1 (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3326840A1 (de) * 1983-07-26 1985-02-14 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
JPS60138269A (ja) * 1983-12-27 1985-07-22 Nippon Denso Co Ltd 電磁式燃料噴射弁
US5088467A (en) * 1984-03-05 1992-02-18 Coltec Industries Inc Electromagnetic injection valve
DE3408012A1 (de) * 1984-03-05 1985-09-05 Gerhard Dipl.-Ing. Warren Mich. Mesenich Elektromagnetisches einspritzventil
DE3726712A1 (de) * 1987-08-11 1989-04-27 Voest Alpine Automotive Kraftstoff-einspritzduese mit nadelhubsensor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB729431A (en) * 1951-09-25 1955-05-04 Leslie Hartridge Apparatus and devices for testing fuel injection pumps and nozzles for internal combustion compression ignition engines
GB754917A (en) * 1953-11-04 1956-08-15 Daimler Benz Ag Apparatus for measuring the movement of valve needles, particularly for fuel injection nozzles of internal combustion engines
US3344663A (en) * 1964-06-03 1967-10-03 Allis Chalmers Mfg Co Stroboscopic means for timing fuel injection
GB1549768A (en) * 1975-08-02 1979-08-08 Lucas Industries Ltd Movement transducers
DE2805175A1 (de) * 1978-02-08 1979-08-09 Bosch Gmbh Robert Einrichtung zum erfassen des spritzbeginns eines einspritzventils
DE2932480A1 (de) * 1979-08-10 1981-02-26 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen

Also Published As

Publication number Publication date
DE3164663D1 (en) 1984-08-16
DE3024424A1 (de) 1982-01-21
JPS5732052A (en) 1982-02-20
JPH0222233B2 (enrdf_load_stackoverflow) 1990-05-17
EP0042915A3 (en) 1982-06-30
EP0042915A2 (de) 1982-01-06

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