DE102005054739B4 - Injector for injecting fuel into combustion chambers of internal combustion engines, in particular piezoactuator-controlled common rail injector - Google Patents
Injector for injecting fuel into combustion chambers of internal combustion engines, in particular piezoactuator-controlled common rail injector Download PDFInfo
- Publication number
- DE102005054739B4 DE102005054739B4 DE102005054739.7A DE102005054739A DE102005054739B4 DE 102005054739 B4 DE102005054739 B4 DE 102005054739B4 DE 102005054739 A DE102005054739 A DE 102005054739A DE 102005054739 B4 DE102005054739 B4 DE 102005054739B4
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- Germany
- Prior art keywords
- nozzle needle
- injector
- nozzle
- laser
- internal combustion
- 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 - Fee Related
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 10
- 239000000446 fuel Substances 0.000 title claims abstract description 9
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 3
- 230000001066 destructive effect Effects 0.000 claims abstract 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000003287 optical effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/063—Lift of the valve needle
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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)
Abstract
Injektor zur Einspritzung von Kraftstoff in Brennräume von Brennkraftmaschinen mit in einem Injektorkörper angeordneten Steuermitteln, mit einem Düsenkörper, an dessen brennraumseitigem freien Ende ein Düsenaustritt ausgebildet ist, und mit einer Düsennadel (11) die in einer Längsausnehmung des Düsenkörpers axial beweglich bzw. betätigbar angeordnet ist, wobei Mittel zum geschlossenen Regeln der Kraftstoff-Einspritzmenge und -rate über eine Erfassung und Regelung des Düsennadelhubes eingerichtet sind, und wobei Mittel zum Nachweis der Düsennadelbewegung zum wechselweisen Erfassen von konstruktiver und destruktiver Interferenz der Lichtwelle einer Laserdiode (10) eingerichtet sind, dadurch gekennzeichnet, dass die Steuermittel einen koaxial zur Düsennadel (11) angeordneten Laserresonator (10, 16, 17) mit beidseitig je einem Endspiegel (16 bzw. 17) umfassen, derart, dass das aus diesem austretende Laserlicht (18) auf die rückseitige Stirnfläche (19) der Düsennadel (11) trifft, dort reflektiert wird und im Zusammenwirken mit dem düsennadelseitigen Endspiegel (17) ein externer Resonator (17, 18, 19) gebildet wird.Injector for injecting fuel into combustion chambers of internal combustion engines with arranged in an injector body control means, with a nozzle body, at whose brennraumseitigem free end a nozzle outlet is formed, and with a nozzle needle (11) which is axially movable or actuated in a longitudinal recess of the nozzle body wherein means are provided for closedly controlling the fuel injection amount and rate via detection and control of the nozzle needle stroke, and wherein means for detecting the nozzle needle movement for alternately detecting constructive and destructive interference of the lightwave of a laser diode (10) are arranged, characterized in that the control means comprise a laser resonator (10, 16, 17) arranged coaxially with the nozzle needle (11), each having an end mirror (16 or 17) on both sides, such that the laser light (18) exiting therefrom acts on the rear end face (19 ) of the nozzle needle (11) t rifft, there is reflected and in cooperation with the nozzle needle side end mirror (17), an external resonator (17, 18, 19) is formed.
Description
Stand der TechnikState of the art
Die Erfindung bezieht sich auf einen Injektor nach dem Oberbegriff des Patentanspruchs 1.The invention relates to an injector according to the preamble of patent claim 1.
Ein CR-Injektor der vorbezeichneten Art ist durch die
Die Mechanik moderner Hochdruck-Einspritzsysteme wird im Betrieb, z. B. im Fahrbetrieb von Kraftfahrzeugen, stark beansprucht. Hierdurch war es bislang faktisch unmöglich, Systeme herzustellen, deren Verhalten während der gesamten Lebensdauer hinreichend konstant bleibt.The mechanics of modern high-pressure injection systems is in operation, z. B. in the driving of motor vehicles, heavily stressed. As a result, it has been practically impossible to produce systems whose behavior remains sufficiently constant throughout their lifetime.
Abhilfe würde eine geschlossene Regelung der Kraftstoff-Einspritzmenge schaffen. Das Problem besteht jedoch in der Bereitstellung einer geeigneten Sensorik.Remedy would provide a closed control of the fuel injection quantity. The problem, however, is the provision of suitable sensors.
Eine besondere Bedeutung erlangt die Notwendigkeit einer Anpassung der Kraftstoff-Einspritzmenge bei direkt angesteuerten Piezo-Injektoren, weil die Einspritzrate hier direkt durch den Aktorhub bestimmt wird. Aktoralterung führt dazu, dass der Zusammenhang zwischen Spannung und Aktorhub im Verlauf der Lebensdauer nicht konstant bleibt, so dass die Ansteuerung des Injektors an den Zustand des Aktors angepasst werden sollte.Of particular importance is the need to adapt the fuel injection quantity for directly controlled piezo injectors, because the injection rate is determined directly by the actuator stroke here. Actuator aging means that the relationship between voltage and actuator stroke does not remain constant over the service life, so that the activation of the injector should be adapted to the state of the actuator.
Aufgabe der Erfindung ist es, eine Möglichkeit für eine Regelung der vom Injektor zur Verfügung gestellten Kraftstoff-Einspritzmenge zu finden.The object of the invention is to find a way to control the fuel injection quantity provided by the injector.
Aus der
Vorteile der ErfindungAdvantages of the invention
Ausgehend von der Erkenntnis, dass die Einspritzrate eines Injektors der in Rede stehenden Art sich durch die Position der Düsennadel bestimmt, wird die Aufgabe gemäß der Erfindung bei einem Injektor der eingangs bezeichneten Gattung durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.Based on the finding that the injection rate of an injector of the type in question determined by the position of the nozzle needle, the object is achieved according to the invention in an injector of the type described by the characterizing features of claim 1.
Da die Düsennadel, zumindest bei Einspritzventilen für Brennkraftmaschinen im Kraftfahrzeugbereich, optisch zugänglich ist, wird vorgeschlagen, die Düsennadelbewegung durch ein optisches Messverfahren zu erfassen. Sie beruht auf der interferometrischen Erfassung des Düsennadelhubs. Zur Messung der Düsennadelbewegung braucht lediglich die Anzahl der überstrichenen Interferenzen bestimmt zu werden. Ein großer Vorteil dieses Messverfahrens besteht darin, dass keine zusätzlichen bewegten Teile in den Injektor integriert werden müssen. Da die Signalhöhe der Interferenzen nicht benutzt wird, werden keine analogen Signale verarbeitet. Das sich hierdurch darstellende Messverfahren ist sehr robust. Die aus der Messung erhaltene Düsennadelposition ist absolut, weil sich die Messung auf die Position der Düsennadel im geschlossenen Zustand des Ventils bezieht.Since the nozzle needle, at least in injection valves for internal combustion engines in the automotive sector, is optically accessible, it is proposed to detect the nozzle needle movement by an optical measuring method. It is based on the interferometric detection of the nozzle needle lift. To measure the nozzle needle movement, only the number of swept interferences needs to be determined. A big advantage of this measurement method is that no additional moving parts have to be integrated into the injector. Since the signal level of the interference is not used, no analog signals are processed. The resulting measuring method is very robust. The nozzle needle position obtained from the measurement is absolute, because the measurement relates to the position of the nozzle needle in the closed state of the valve.
Zeichnungdrawing
Zur näheren Veranschaulichung der Erfindung dienen Ausführungsbeispiele, die in der Zeichnung dargestellt und im Folgenden detailliert beschrieben sind. Es zeigt (jeweils in schematischer Blockschaltbild-Darstellung):To illustrate the invention in more detail serve exemplary embodiments, which are illustrated in the drawings and described in detail below. It shows (each in schematic block diagram representation):
Beschreibung der AusführungsbeispieleDescription of the embodiments
Es bezeichnet
Bei der Ausführungsform nach
Bewegt sich die Düsennadel
Der gemessene Intensitätsverlauf rührt her aus der Einkopplung des Laserlichts in den externen Resonator
Aus den gemäß vorstehender Schilderung gemessenen Daten lässt sich unschwer der Düsennadelhub und die dadurch bestimmte Einspritzmenge und -rate ermitteln. Die ermittelten Werte dienen als Regelgröße zur Ansteuerung der Steuermittel (z. B eines Magnetsteuerventils) des Injektors.From the data measured according to the above description, it is easy to determine the nozzle needle stroke and the injection quantity and rate determined thereby. The determined values serve as control variable for controlling the control means (eg a magnetic control valve) of the injector.
Die nicht erfindungsgemäße Variante nach
Wie bei der oben beschriebenen Ausführungsform nach
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005054739.7A DE102005054739B4 (en) | 2005-11-17 | 2005-11-17 | Injector for injecting fuel into combustion chambers of internal combustion engines, in particular piezoactuator-controlled common rail injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005054739.7A DE102005054739B4 (en) | 2005-11-17 | 2005-11-17 | Injector for injecting fuel into combustion chambers of internal combustion engines, in particular piezoactuator-controlled common rail injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE102005054739A1 DE102005054739A1 (en) | 2007-05-24 |
| DE102005054739B4 true DE102005054739B4 (en) | 2017-06-08 |
Family
ID=37989354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE102005054739.7A Expired - Fee Related DE102005054739B4 (en) | 2005-11-17 | 2005-11-17 | Injector for injecting fuel into combustion chambers of internal combustion engines, in particular piezoactuator-controlled common rail injector |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE102005054739B4 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014211334B3 (en) * | 2014-06-13 | 2015-08-27 | Continental Automotive Gmbh | Method for characterizing a hydraulic coupling element of a piezo injector |
| DE102015206286B4 (en) * | 2015-04-09 | 2019-05-29 | Continental Automotive Gmbh | Method and device for operating an injector |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3826194A1 (en) * | 1988-08-02 | 1990-02-15 | Hommelwerke Gmbh | Device for length measurement |
| DE19519191C2 (en) * | 1995-05-24 | 1997-04-10 | Siemens Ag | Injector |
| DE19712374A1 (en) * | 1997-03-25 | 1998-10-01 | Bosch Gmbh Robert | Position and displacement sensor |
| DE19743156A1 (en) * | 1997-09-30 | 1999-04-22 | Bosch Gmbh Robert | Position or displacement sensor for needle valve in fuel injection valve for motor vehicle |
| DE19936668A1 (en) * | 1999-08-04 | 2001-02-22 | Bosch Gmbh Robert | Common rail injector |
| AT501574B1 (en) * | 2006-06-13 | 2008-01-15 | Avl List Gmbh | OPTICAL WAY SENSOR |
-
2005
- 2005-11-17 DE DE102005054739.7A patent/DE102005054739B4/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3826194A1 (en) * | 1988-08-02 | 1990-02-15 | Hommelwerke Gmbh | Device for length measurement |
| DE19519191C2 (en) * | 1995-05-24 | 1997-04-10 | Siemens Ag | Injector |
| DE19712374A1 (en) * | 1997-03-25 | 1998-10-01 | Bosch Gmbh Robert | Position and displacement sensor |
| DE19743156A1 (en) * | 1997-09-30 | 1999-04-22 | Bosch Gmbh Robert | Position or displacement sensor for needle valve in fuel injection valve for motor vehicle |
| DE19936668A1 (en) * | 1999-08-04 | 2001-02-22 | Bosch Gmbh Robert | Common rail injector |
| AT501574B1 (en) * | 2006-06-13 | 2008-01-15 | Avl List Gmbh | OPTICAL WAY SENSOR |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102005054739A1 (en) | 2007-05-24 |
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| R020 | Patent grant now final | ||
| R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |