EP2990639A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP2990639A1
EP2990639A1 EP15170274.3A EP15170274A EP2990639A1 EP 2990639 A1 EP2990639 A1 EP 2990639A1 EP 15170274 A EP15170274 A EP 15170274A EP 2990639 A1 EP2990639 A1 EP 2990639A1
Authority
EP
European Patent Office
Prior art keywords
contact pin
fuel injector
coil
holding body
nozzle
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
EP15170274.3A
Other languages
German (de)
English (en)
Other versions
EP2990639B1 (fr
Inventor
Andreas Rau
Marco Beier
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 EP2990639A1 publication Critical patent/EP2990639A1/fr
Application granted granted Critical
Publication of EP2990639B1 publication Critical patent/EP2990639B1/fr
Active 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
    • 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
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • 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
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F02M2200/242—Displacement sensors

Definitions

  • the invention relates to a fuel injector with a device for determining the stroke of a nozzle needle.
  • a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine wherein the fuel injector has a needle lift sensor.
  • the known fuel injector comprises a nozzle body, a nozzle needle, a holding body and an electromagnetic coil for determining the Nadelhubs.
  • the holding body is clamped to the nozzle body with the interposition of an intermediate plate or a valve plate or throttle plate.
  • the nozzle needle is arranged longitudinally displaceable in the nozzle body, it being known from the prior art that the nozzle needle cooperates by its longitudinal movement with a nozzle needle seat and thereby opens and closes at least one injection opening in a combustion chamber of an internal combustion engine.
  • the spool is arranged at least partially radially surrounding the nozzle needle. About the contacting of the coil discloses the DE 3726712 A1 None.
  • a lead-out near the lead-out of the holding body is often space-constrained only possible with fuel injectors with a very long nozzle needle and therefore not suitable for example for fuel injectors with a piezoelectric actuator.
  • the fuel injector according to the invention for injecting fuel into a combustion chamber of an internal combustion engine has a spool as a needle lift sensor, which can also be used with fuel injection injectors with a comparatively short nozzle needle, wherein the components of the fuel injector braced with one another are simultaneously positioned or fixed by contacting the spool can.
  • the fuel injector comprises a nozzle body, a nozzle needle, a holding body and an electromagnetic coil.
  • the holding body is clamped to the nozzle body.
  • a pressure chamber is formed, in which the nozzle needle is arranged longitudinally displaceable, wherein the nozzle needle cooperates by its longitudinal movement with a nozzle needle seat and thereby opens and closes at least one injection opening in the combustion chamber.
  • the coil is at least partially arranged radially surrounding the nozzle needle, wherein the coil is electrically conductively connected to at least one contact pin.
  • the at least one contact pin is arranged in a holding body recess formed in the holding body, preferably a bore or a groove.
  • the at least one contact pin can be guided, for example, parallel or the same aligned with the nozzle needle in the holding body.
  • the lead out of the contact from the holding body can thus also be done far away from the coil.
  • This type of contacting the coil is suitable for any fuel injectors, including fuel injectors with piezo actuators.
  • the at least one contact pin protrudes into a nozzle body recess formed in the nozzle body and thereby positions the nozzle body relative to the holding body.
  • the Düsenanalysisausnaturalung is a bore or a groove, which are inexpensive to manufacture.
  • the contact pin combines two functions: on the one hand the electrical contacting of the coil and on the other hand a positioning or fixing of the two components nozzle body and holder body. In this case, the Gar stresses thereafterung and the Düsenanalysisausnaturalung aligned to achieve a simple positioning or fixation.
  • the HalteShettiausnaturalung and / or the Düsen redesignausnaturalung is a bore, and the at least one contact pin is pressed media-tight in the bore or in the holes.
  • the contact pin is guided media-tight in the holding body and / or nozzle body and thus additionally fulfills a sealing function by himself seals against the nozzle body and / or the holding body.
  • a valve plate and / or a throttle plate is arranged between the nozzle body and the holding body, wherein the at least one contact pin in the valve plate and / or the throttle plate in a further recess, preferably a bore or a groove, or in several other Recesses, preferably holes or grooves, is arranged.
  • a valve plate or a throttle plate can be arranged between the nozzle body and the holding body. Accordingly, recesses are also formed in these plates arranged between the nozzle body and the holding body, through which the contact pin is guided or into which the contact pin protrudes.
  • the recesses are analogous to the recesses in the holding body and nozzle body either holes or grooves.
  • the at least one Contact pin to be guided past the control of the nozzle needle.
  • the other components valve plate and / or throttle plate can be positioned to the components nozzle body and / or holding body.
  • either two or three or four components can be positioned relative to one another.
  • the further recess formed in the valve plate and / or the throttle plate is a bore, and the at least one contact pin is pressed into the bore.
  • the contact pin is guided media-tight in the other recess and no further sealing measures must be taken with respect to the contact pin.
  • the at least one contact pin is coated on its outer circumference in an electrically insulating manner.
  • any materials that are not electrically insulating may be used for the components connected to the contact pin-for example, holding body, valve plate, throttle plate and nozzle body.
  • a contact pin end facing away from the coil and formed on the at least one contact pin is electrically conductively connected to a contact pin arranged in the holding body. This facilitates the electrical connection of the contact pin and the continuation of the contacting in the direction of a control device which evaluates the voltage changes occurring at the coil.
  • the contact pin can compensate for tolerances and is easy to assemble.
  • the contact pin is separated by a sealing element media-tight to the environment, wherein the sealing element is preferably a Glaseinschmelzung or an elastomer.
  • the sealing element can thereby seal the entire implementation of the contact, so pin and contact pin, to the environment outside of the fuel injector.
  • the sealing element can also so be arranged and designed that it isolates the contact pin and / or the contact pin electrically to the holding body.
  • an electrical line is passed through the sealing element, wherein the electrical line is electrically connected to the contact pin.
  • the sealing element can also fix the contact between the electrical line and the contact pin and possibly bring under bias.
  • the sealing element can also act as an electrical insulator in addition to the media seal.
  • a contact pin end remote from the coil and formed on the at least one contact pin is connected in an electrically conductive manner to an electrical line arranged in the holding body, the electrical lead leading out of the holding body.
  • the at least one contact pin is electrically conductively connected to a first coil end formed on the coil, wherein a second coil end formed on the coil is electrically grounded to the fuel injector.
  • the second contact can be almost anywhere on the fuel injector or on an associated with him engine component, such as a cylinder head, tapped.
  • the second coil end is, for example, electrically to the nozzle body or with the Holding body connected. For the determination of the nozzle needle lift thus only an additional electrical connection to the fuel injector is required, namely the connection to the first coil end.
  • a further contact pin is arranged in the fuel injector, wherein the further contact pin is guided electrically isolated from the contact pin, wherein a formed on the coil first coil end is electrically conductively connected to the contact pin and formed on the coil second coil end electrically is conductively connected to the other contact pin.
  • Fig.1 shows a longitudinal section of a fuel injector 1 according to the invention of a fuel injection system, wherein only the essential parts for the present invention are shown.
  • the fuel injector 1 is used for the injection of fuel under high pressure, for example, from a so-called common rail, can be supplied from a high-pressure pump or from an internal high-pressure accumulator of the fuel injector 1, in a combustion chamber of an internal combustion engine.
  • the fuel injector 1 has a pressure chamber 6 formed in a nozzle body 2, in which a nozzle needle 3 is arranged to be longitudinally displaceable. As a result of the longitudinal movement of the nozzle needle 3, it interacts with a nozzle needle seat 7 formed on the nozzle body 2 and thereby opens and closes at least one injection opening 8 formed in the nozzle body 2 for the injection of fuel under high pressure into the combustion chamber of the internal combustion engine.
  • the nozzle needle 1 is designed so that due to the high pressure in the pressure chamber 6, a hydraulically opening, i. from the nozzle needle seat 7 away leading force acts.
  • the nozzle body 2 is clamped with the interposition of a throttle plate 11 and a valve plate 4 with a holding body 12 by a nozzle retaining nut 41.
  • the valve plate 4, the throttle plate 11 and the nozzle body 2 extends a high pressure passage 40 which connects the pressure chamber 6 with the high pressure accumulator, not shown, or the high pressure pump.
  • a control chamber 10 is formed between the nozzle needle 3, the throttle plate 11 and a sleeve 42 in which the nozzle needle 3 is longitudinally movably guided.
  • the sleeve 42 is pressed against the throttle plate 11 by a nozzle spring 43, which cooperates with a nozzle needle ring 44 fixedly connected to the nozzle needle 3.
  • the nozzle spring 43 exerts a closing force on the nozzle needle 3.
  • the pressure in the control chamber 10, which also exerts a closing force on the nozzle needle 3, is controlled by a control valve 5.
  • a discharge throttle 51 arranged in the throttle plate 11 leads from the control chamber 10 into a discharge chamber 54 on the side of the throttle plate 11 remote from the control chamber.
  • an inlet throttle 58 is formed in the valve plate 4, which also connects the control chamber 10 with the Abêtraum 54, wherein the connection can be interrupted by a closing body 55.
  • a filling bore 59 branches off from the high-pressure passage 40 within the throttle plate 11 and connects it to the diversion chamber 54, wherein this connection can likewise be interrupted by the closing body 55.
  • the closing body 55 rests against a valve seat 4 arranged on the first valve seat 56 and thereby closes a hydraulic connection from the Abêtraum 54 to a low pressure chamber 60, from which a hydraulic connection, not shown, to a low pressure, not shown, fuel tank or a low-pressure, not shown prefeed pump leads.
  • the inlet throttle 58 and the filling bore 59 are opened.
  • a second valve seat 65 is formed on the valve plate 11. If the closing body abuts against the second valve seat 65, then the hydraulic connection from the discharge chamber 54 to the low-pressure chamber 60 is opened and at the same time the hydraulic connections through the inlet throttle 58 and the filling bore 59 are closed.
  • the closing body 55 is arranged in a guide bore 57 formed in the valve plate 4, from which it is guided during the valve movements.
  • the guide bore 57 is at the same time the hydraulic connection between the Abêtraum 54 and the low-pressure chamber 60 when the closing body 55 is lifted from the first valve seat 56.
  • the closing body 55 is actuated by an actuator 70, wherein the actuator 70 can be driven piezoelectrically or electromagnetically, for example. If the actuator 70 is activated, it presses the closing body against the second valve seat 65 counter to the force of a valve spring 62 arranged in the low-pressure space 60, which acts between the valve plate 4 and a spring seat 61 pressed onto the closing body 55. After completion of the activation by the actuator 70, the closing body 55 by the force of Valve spring 62 and / or the hydraulically acting forces on the closing body 55 pressed back against the first valve seat 56.
  • control valve 5 The illustrated control of the pressure in the control chamber 10 by the control valve 5 has been selected by way of example.
  • any type of control valve can be selected which controls the pressure in the control chamber 10.
  • an electromagnetic coil 20 is arranged in a receiving groove 19 formed in the nozzle body 2 so that it at least partially radially surrounds the nozzle needle 3.
  • the nozzle body 2 is made in two parts. Thereby, the spool 20 and / or the sleeve 42 can be better positioned within the fuel injector 1. However, this is not absolutely necessary, so that in the following always only one nozzle body 2 is written.
  • the recesses 23a, 22a, 24a are arranged relative to one another in such a way that they lie in alignment.
  • a further recess may be formed in the nozzle body 2, through which the contact pin 21 is also guided.
  • the Contact pin 21 electrically connected to a arranged in the holding body 12 contact pin 25.
  • the contact pin 25 in turn is connected to an electrical line 26 which can be continued outside the holding body 12 and connected to a control unit, not shown.
  • the sealing element 27 is arranged the contact pin 25 and / or the electrical line 26 surrounding.
  • the contact pin 25 and the electrical line 26 are encapsulated with the sealing element 27, so that no fuel can flow through the Garismeschmelzung 24 a in the environment outside of the fuel injector 1.
  • the sealing element 27 may be for example a Glaseinschmelzung or an elastomer.
  • the coil 20 is merely connected to a contact pin 21. That is, the second electrical terminal of the coil 20, namely, a second coil end 20b, is grounded to the fuel injector 1.
  • the coil 20 can also be electrically connected via a further contact pin, which is guided analogously to the contact pin 21 through the nozzle body 2, throttle plate 11, valve plate 4 and holding body 12, but is electrically insulated from the contact pin 21.
  • Fig.2 schematically shows a further embodiment of the fuel injector according to the invention, wherein the coil 20 is contacted via two contact pins 21, 31.
  • the structure of the fuel injector 1 is similar to that of Fig.1 , so that below only to the main differences to the embodiment of the Fig.1 to be received.
  • Fig.2 serves mainly to represent the arrangement of the contact pins 21, 31. Therefore, the representation of actuator, control valve and holes has been omitted. In principle, however, any control for the nozzle needle 3 can be used, which lifts them from the nozzle needle seat 7 and presses against the nozzle needle seat 7.
  • Fig.2 is the holding body 12 braced with the interposition of the throttle plate 11 with the nozzle body 2 by the nozzle retaining nut, not shown. Trained in the nozzle body 2 receiving groove 19 is arranged with such a large distance to the throttle plate 11, that the two contact pins 21, 31 are guided by a respective recess in the nozzle body 2: the contact pin 21 is guided by a Düsen redesignaus principleung 2a and the further contact pin 31 through another nozzle body recess 2b.
  • the two contact pins 21, 31 are guided in the throttle plate 11 and in the holding body 12: the contact pin 21 in the Drosselplattenausappelung 23 a and the HalteConsequentlyausnaturalung 24 a, and the further contact pin 31 in a further Drosselplattenausnaturalung 23 b and a further GarConsequentlyausnaturalung 24 b.
  • the coil 20 is electrically conductively connected to the two contact pins 21, 31: the first coil end 20a with the contact pin 21 and the second coil end 20b with the other contact pin 31.
  • the two contact pins 21, 31 respectively an electrical line 26, 36 connected: the contact pin 21 with the electrical line 26 and the further contact pin 31 with the further electrical line 36.
  • the two electrical lines 26, 36 are led out of the holder body 12 and lead into a control unit, not shown.
  • the two electrical lines 26, 36 are sealed at their exits from the holding body in each case with a sealing element 27, 37 to the environment.
  • the sealing element 27, 37 can be attached so that in addition a contact pressure between the respective contact pin 21, 31 and the associated electrical line is applied.
  • Fig.2 makes it possible to fix the nozzle body 2 via the two contact pins 21, 31 to the throttle plate 11 and / or the holding body 12.
  • the magnetic coil 20 is arranged surrounding the nozzle needle 3 such that the magnetic field induced by the coil 20 is changed by the longitudinal movement of the nozzle needle 3 during the injection process.
  • the voltage induced in the coil 20 which is tapped off via the two contact pins 21, 31 and is supplied to the control unit by means of the two electrical lines 26, 36, also changes.
  • the control unit thus determines directly from the voltage applied to the coil 20 voltage or from the change in the voltage Düsennadelhub.
  • the nozzle needle stroke can therefore be measured directly and does not have to be calculated via an indirect measurement, for example the measurement of a pressure in the fuel injector 1.
  • the corresponding error susceptibility of the indirect measurements thus does not occur in the measurement of the nozzle needle stroke according to the invention.
  • pressure oscillations occur in the fuel injector 1, which falsify the indirect measurement of the nozzle needle stroke via a pressure measurement.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)
EP15170274.3A 2014-08-25 2015-06-02 Injecteur de carburant Active EP2990639B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014216834.1A DE102014216834A1 (de) 2014-08-25 2014-08-25 Kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP2990639A1 true EP2990639A1 (fr) 2016-03-02
EP2990639B1 EP2990639B1 (fr) 2019-08-07

Family

ID=53284090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15170274.3A Active EP2990639B1 (fr) 2014-08-25 2015-06-02 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP2990639B1 (fr)
DE (1) DE102014216834A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017153064A1 (fr) * 2016-03-09 2017-09-14 Robert Bosch Gmbh Soupape d'injection de carburant

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192427A (en) * 1986-07-12 1988-01-13 Pierburg Gmbh & Co Kg Stroke and spring force adjustment in an electromagnetic fuel-injection valve
DE3726712A1 (de) 1987-08-11 1989-04-27 Voest Alpine Automotive Kraftstoff-einspritzduese mit nadelhubsensor
US4834295A (en) * 1987-06-09 1989-05-30 Weber S.R.L. Fuel atomisation and metering valve for a fuel injection device of an internal combustion engine
US20040041038A1 (en) * 2002-09-04 2004-03-04 Delaney John H. Dual-coil outwardly-opening fuel injector
DE102004056667A1 (de) * 2004-11-24 2006-06-01 Robert Bosch Gmbh Elektrische Überbrückung in Kraftstoffinjektoren
DE102006051206A1 (de) 2006-10-30 2008-05-08 Robert Bosch Gmbh Kraftstoffinjektor mit einer Messeinrichtung
WO2013036318A1 (fr) * 2011-09-08 2013-03-14 International Engine Intellectual Property Company, Llc Ensemble électrovalve et borne pour injecteur de carburant

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5244180A (en) * 1992-09-03 1993-09-14 Siemens Automotive L.P. Solenoid pre-loader
US7407120B1 (en) * 2002-11-21 2008-08-05 Jack French Adjustable racing injector
DE102012211230A1 (de) * 2012-06-29 2014-01-02 Robert Bosch Gmbh Brennstoffeinspritzventil

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192427A (en) * 1986-07-12 1988-01-13 Pierburg Gmbh & Co Kg Stroke and spring force adjustment in an electromagnetic fuel-injection valve
US4834295A (en) * 1987-06-09 1989-05-30 Weber S.R.L. Fuel atomisation and metering valve for a fuel injection device of an internal combustion engine
DE3726712A1 (de) 1987-08-11 1989-04-27 Voest Alpine Automotive Kraftstoff-einspritzduese mit nadelhubsensor
US20040041038A1 (en) * 2002-09-04 2004-03-04 Delaney John H. Dual-coil outwardly-opening fuel injector
DE102004056667A1 (de) * 2004-11-24 2006-06-01 Robert Bosch Gmbh Elektrische Überbrückung in Kraftstoffinjektoren
DE102006051206A1 (de) 2006-10-30 2008-05-08 Robert Bosch Gmbh Kraftstoffinjektor mit einer Messeinrichtung
WO2013036318A1 (fr) * 2011-09-08 2013-03-14 International Engine Intellectual Property Company, Llc Ensemble électrovalve et borne pour injecteur de carburant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017153064A1 (fr) * 2016-03-09 2017-09-14 Robert Bosch Gmbh Soupape d'injection de carburant

Also Published As

Publication number Publication date
EP2990639B1 (fr) 2019-08-07
DE102014216834A1 (de) 2016-02-25

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