EP2530293A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP2530293A1
EP2530293A1 EP12165963A EP12165963A EP2530293A1 EP 2530293 A1 EP2530293 A1 EP 2530293A1 EP 12165963 A EP12165963 A EP 12165963A EP 12165963 A EP12165963 A EP 12165963A EP 2530293 A1 EP2530293 A1 EP 2530293A1
Authority
EP
European Patent Office
Prior art keywords
nozzle needle
fuel injector
actuator
closing
magnetic actuator
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Withdrawn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
EP12165963A
Other languages
German (de)
English (en)
Inventor
Henning Kreschel
Stefan Haug
Marco Beier
Roman Etlender
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 EP2530293A1 publication Critical patent/EP2530293A1/fr
Withdrawn legal-status Critical Current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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
    • F02M51/0617—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature having two or more electromagnets
    • 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
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
    • F02M51/0617—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature having two or more electromagnets
    • F02M51/0621—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature having two or more electromagnets acting on one mobile armature

Definitions

  • the invention relates to a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine having the features of the preamble of claim 1.
  • Such a fuel injector comprises a nozzle needle, which is guided in a high-pressure bore of a nozzle body for releasing and closing at least one injection opening and is acted upon in the direction of a sealing seat by the spring force of a closing spring, and an actuator assembly, which is arranged in a low pressure region and by means of which the nozzle needle is directly operable.
  • a fuel injector comprising a nozzle needle or an injection valve element is disclosed with an opening direction facing, acted upon by low pressure low pressure surface in combination with a throttle connection.
  • the object of the low pressure surface formed on the injection valve element is to reduce the stationary hydraulic closing force and to generate a hydraulic opening force in the open state.
  • the throttle connection is arranged and dimensioned such that the hydraulic opening force counteracts a hydraulic closing force acting in the closing direction when the injection valve element is open, whereby the closing speed of the injection valve element can be increased.
  • the combination of low pressure area and throttle connection causes that required for direct actuation of the nozzle needle Actuator power is reduced, so that comparatively low-power actuators can be used.
  • the present invention has for its object to provide a fuel injector, which allows an increase in the efficiency of injection and combustion.
  • a fast-opening and fast closing directly operable fuel injector should be specified.
  • the actuator arrangement of the proposed fuel injector comprises a first magnetic actuator for opening the nozzle needle and a second magnetic actuator for closing the nozzle needle, wherein at least one magnetic actuator cooperates with an anchor element, which is operatively connected to the nozzle needle.
  • the actuator arrangement of a fuel injector according to the invention accordingly has at least two magnetic actuators whose effective direction is preferably opposite.
  • the magnetic actuators of the actuator arrangement can be activated independently of one another.
  • the closing of the nozzle needle causing magnetic actuator is assisted in its task by the closing spring, the spring force of the nozzle needle in the closing direction, i. in the direction of the sealing seat, acted upon. Accordingly, a comparatively small magnetic actuator can be used to close the nozzle needle.
  • the formation of a closing throttle in order to produce in the open position of the nozzle needle a force acting in the closing direction on the nozzle needle hydraulic closing force is dispensable.
  • the efficiency of the injection can be increased so that the same power with reduced injection quantity is achievable. This in turn means that fuel can be saved and CO 2 emissions can be reduced.
  • At least one magnetic actuator of the actuator assembly is a polarized or electrodynamic magnetic actuator.
  • the magnetic actuator cooperates with an armature element designed as a flat or plunger armature.
  • the magnetic actuators and the at least one anchor element are designed and arranged in such a way that the armature element is moved in the closing direction of the nozzle needle when the one magnet actuator is energized in the opening direction of the nozzle needle and when the other magnet actuator is energized.
  • Each magnetic actuator can also cooperate with its own anchor element.
  • the anchor member is indirectly operatively connected via a plunger body with the nozzle needle.
  • the plunger body is preferably positively, positively and / or materially connected to the anchor element and coupled to the nozzle needle mechanically or hydraulically in such a way that a movement of the anchor element is transmitted directly or indirectly to the nozzle needle.
  • the direction of movement of the anchor element of the direction of movement of the nozzle needle correspond or - in reverse control of the nozzle needle - this be opposite.
  • the latter requires a device for reversing the direction of movement. Further, in a transmission of the movement of the anchor element on the nozzle needle, a force or displacement transmission can be effected.
  • a force or displacement transmission can be effected, for example, by the armature element being operatively connected to the nozzle needle indirectly via a coupler body and / or a hydraulic coupler volume.
  • a coupler body can also be used with the anchor element force, form and / or cohesively connected plunger body.
  • hydraulically effective surfaces are formed both on the coupler body, as well as on the nozzle needle whose size ratio is selected such that a force or Wegverstärkung occurs.
  • the coupler body and / or the coupler volume can also be used to reverse the direction of movement of a magnetic actuator, if its direction of action or the direction of movement of the anchor element is opposite to the direction of movement of the nozzle needle.
  • the nozzle needle may be formed one or more parts. Preferably, it has a guide portion, with which it is guided in a pressurized with low pressure bore of a holding body.
  • the guide gap between the guide section of the nozzle needle and the wall of the bore formed in the holding body is further preferably designed as a sealing gap, via which the low-pressure region of the fuel injector is sealed against the high-pressure region.
  • a leakage quantity flowing off over the guide area is preferably supplied to a return via the low-pressure area.
  • the acted upon by low pressure bore of the holding body has an inner diameter D l , which is smaller than the seat diameter D s of the sealing seat.
  • D l the inner diameter of the nozzle needle
  • F needle - F feather - D S - D l * p Rail .
  • F spring is the spring force of the nozzle needle acting in the direction of the sealing seat closing spring. The force acting on the closed nozzle needle force is therefore directly on the two diameters D l and D s adjustable.
  • the fuel injector according to the invention is preferably designed as a tophead injector, since such an injector has sufficient space for accommodating an actuator arrangement comprising at least two magnetic actuators.
  • a fuel injector according to the invention can also be designed as an inline injector.
  • Fuel injectors shown each have a nozzle needle 1, which is guided in a high-pressure bore 2 of a nozzle body 3 in a liftable manner.
  • injection opening 4 can be opened and closed.
  • the nozzle needle 1 In order to release the at least one injection opening 4, the nozzle needle 1 must be lifted by a sealing seat 5, which in the present case has a conical shape and cooperates sealingly with a conical sealing surface formed on the nozzle needle.
  • the nozzle needle 1 is to be returned to the sealing seat 5.
  • the at least one injection opening 4 is supplied via the high-pressure bore 2 under high pressure fuel.
  • the high-pressure fuel passes through an inlet bore 16, which via a high pressure port 17 with a high-pressure accumulator (not shown), preferably a rail, is connectable.
  • the inlet bore 16 and the high-pressure port 17 are formed in a holding body 15, which is connected to the nozzle body 3 via a nozzle retaining nut 18.
  • the lifting movement of the nozzle needle 1, by means of which the at least one injection opening 4 is releasable and closable, is controlled by means of an actuator arrangement 7.
  • the control is direct, that is without the interposition of a servo valve.
  • the direct control has over the indirect control by means of a servo valve on the advantage that the nozzle needle opens and closes faster. Furthermore, eliminating the need to perform a Abêtmenge the servo valve to a return, so that the efficiency of the system is further increased.
  • the for direct control of the nozzle needle 1 provided actuator assembly 7 has in the two in the Fig. 1 and 2 illustrated embodiments in each case two magnetic actuators 7.1, 7.2.
  • the magnetic actuators 7.1, 7.2 are each arranged in a low-pressure region 8.
  • the load on the magnetic actuators 7.1, 7.2 reduced, on the other hand, the electrical contacting of the magnetic actuators 7.1, 7.2 are simplified.
  • the magnetic actuators 7.1 and 7.2 are designed such that the armature element 9 is moved in the closing direction of the nozzle needle 1 when the magnet actuator 7.1 is energized in the opening direction and when the magnet actuator 7.2 is energized.
  • a gap formed between the guide section 13 of the nozzle needle 1 and the holding body 15 is designed as a sealing gap, via which the low-pressure region 8 is sealed off from the high-pressure bore 2.
  • the inner diameter D l of the bore 14 is smaller than the seat diameter D s of the sealing seat 5 is selected.
  • the guide section 13 of the nozzle needle 1 is in the present case non-positively and positively connected to the anchor element 9.
  • the trained as a flat armature anchor element 9 is for this purpose penetrated by the guide portion 13.
  • the anchor member 9 is also acted upon in the closing direction of the nozzle needle 1 by the spring force of a compression spring 19, which is arranged as the actuator assembly 7 in the low pressure region 8.
  • the operative connection of the nozzle needle 1 with the anchor element 9 via a coupling device for amplifying the actuator force can be used as a coupler body 11 Plunger body 10, which is positively and positively connected to the anchor member 9, and a hydraulic coupler volume 12 which is formed in the bore 14 of the holding body 15 and in the axial direction on the one hand by an end face of the plunger body 10 and on the other hand by an end face of the nozzle needle. 1 is limited.
  • the movement of the anchor element 9 is transmitted via the coupling device to the nozzle needle 1 such that a force transmission takes place.
  • the force transmission in the present case is> 1.
  • an inverse coupler can be provided, with which a reversal of the direction of movement can be effected, so that the anchor element 9 can also move in the opposite direction to the nozzle needle 1.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP12165963A 2011-05-30 2012-04-27 Injecteur de carburant Withdrawn EP2530293A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110076663 DE102011076663A1 (de) 2011-05-30 2011-05-30 Kraftstoffinjektor

Publications (1)

Publication Number Publication Date
EP2530293A1 true EP2530293A1 (fr) 2012-12-05

Family

ID=46052575

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12165963A Withdrawn EP2530293A1 (fr) 2011-05-30 2012-04-27 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP2530293A1 (fr)
DE (1) DE102011076663A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2653712A1 (fr) * 2012-04-16 2013-10-23 Robert Bosch GmbH Injecteur de carburant avec électrovanne
EP2884088A1 (fr) * 2013-12-10 2015-06-17 Robert Bosch Gmbh Injecteur de carburant

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014200771A1 (de) 2014-01-17 2015-07-23 Robert Bosch Gmbh Kraftstoffinjektor
DE102014203640A1 (de) 2014-02-28 2015-09-03 Robert Bosch Gmbh Fluidinjektor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1290007A1 (ru) * 1985-04-02 1987-02-15 Коломенский Филиал Всесоюзного Заочного Политехнического Института Форсунка с электрическим управлением
US5421521A (en) * 1993-12-23 1995-06-06 Caterpillar Inc. Fuel injection nozzle having a force-balanced check
DE102008041553A1 (de) 2008-08-26 2010-03-04 Robert Bosch Gmbh Kraftstoff-Injektor
DE102010041109A1 (de) * 2010-09-21 2012-03-22 Robert Bosch Gmbh Kraftstoffinjektor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1290007A1 (ru) * 1985-04-02 1987-02-15 Коломенский Филиал Всесоюзного Заочного Политехнического Института Форсунка с электрическим управлением
US5421521A (en) * 1993-12-23 1995-06-06 Caterpillar Inc. Fuel injection nozzle having a force-balanced check
DE102008041553A1 (de) 2008-08-26 2010-03-04 Robert Bosch Gmbh Kraftstoff-Injektor
DE102010041109A1 (de) * 2010-09-21 2012-03-22 Robert Bosch Gmbh Kraftstoffinjektor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2653712A1 (fr) * 2012-04-16 2013-10-23 Robert Bosch GmbH Injecteur de carburant avec électrovanne
EP2884088A1 (fr) * 2013-12-10 2015-06-17 Robert Bosch Gmbh Injecteur de carburant

Also Published As

Publication number Publication date
DE102011076663A1 (de) 2012-12-06

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