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EP1167729B2 - Actionneur piézo-électrique pour injecteur - Google Patents

Actionneur piézo-électrique pour injecteur Download PDF

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Publication number
EP1167729B2
EP1167729B2 EP00113992A EP00113992A EP1167729B2 EP 1167729 B2 EP1167729 B2 EP 1167729B2 EP 00113992 A EP00113992 A EP 00113992A EP 00113992 A EP00113992 A EP 00113992A EP 1167729 B2 EP1167729 B2 EP 1167729B2
Authority
EP
European Patent Office
Prior art keywords
actuator
terminal voltage
coupler
voltage
injection
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 - Lifetime
Application number
EP00113992A
Other languages
German (de)
English (en)
Other versions
EP1167729B1 (fr
EP1167729A1 (fr
Inventor
Jürgen BOSS
Johannes-Joerg Rueger
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8169130&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1167729(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to EP00113992A priority Critical patent/EP1167729B2/fr
Priority to DE50009866T priority patent/DE50009866D1/de
Publication of EP1167729A1 publication Critical patent/EP1167729A1/fr
Publication of EP1167729B1 publication Critical patent/EP1167729B1/fr
Application granted granted Critical
Publication of EP1167729B2 publication Critical patent/EP1167729B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements

Definitions

  • the invention relates to a method for operating an injection valve for fuel, in which a piezoelectric actuator drives a closing member via a hydraulic coupler. It further relates to a fuel injection system having a number of such injectors.
  • a fuel injection system As an essential component can be used in an internal combustion engine for introducing the fuel into the combustion chambers of the cylinder, a fuel injection system.
  • a fuel injection system usually comprises a number of injection nozzles, which can be supplied individually or in the manner of a so-called common-rail system (CR system) via a central supply system with fuel.
  • CR system common-rail system
  • each injector is usually integrated into a respective associated injection valve, via which the fuel injection is adjustable in a predeterminable manner.
  • the injection valves can be provided for an electrical control with a piezoelectric actuator.
  • Such injection valve for fuel injection into the combustion chamber of an internal combustion engine with a high-pressure system or CR system is known from DE 197 328 02 known.
  • This injection valve is designed in a double-switching manner and has a closure member, which is in one of two alternative valve seats in each case in a closed position and thereby causes a closure of the injection nozzle. In a middle position between the two valve seats, however, the closing member assumes an opening position.
  • the closing member can be driven via a piezoelectric actuator.
  • the piezoelectric actuator is charged to a drive voltage, which is dependent on the pressure in the common rail system. Due to the drive voltage, the actuator expands in the longitudinal direction. This longitudinal extension is transmitted via a hydraulic coupler on the closing member, so that on the one hand the producible by the actuator stroke is amplified and on the other hand, the closure member is decoupled from a possible static temperature expansion of the actuator.
  • a charging of the piezoelectric actuator thus causes via the hydraulic coupler, a transfer of the Verschottegliedes first from the first closed position to the open position and then from the open position to the second closed position.
  • a discharge of the piezoelectric actuator due to the associated contraction in the longitudinal direction via the hydraulic coupler causes a discharge of the piezoelectric actuator due to the associated contraction in the longitudinal direction via the hydraulic coupler, a transfer of the Verschottegliedes first from the second closed position to the open position and then from the open position to the first closed position.
  • a precise positioning of the closure member via the drive voltage is required.
  • the implementation of the drive voltage in a positioning of the closure member, ie in a corresponding valve lift, depends essentially on the filling state of the hydraulic coupler. In particular, the most complete possible (re-) filling of the hydraulic coupler before each injection and thus a compensation of said leakage losses is necessary.
  • the refilling of the hydraulic coupler after an injection takes place at the injection valve according to the DE 197 328 02 as a result of a suitable system pressure of about 15 bar also via the leakage gaps, but only in the period in which the piezoelectric actuator is not driven. Accordingly, the result of refilling after injection may vary depending on the amount of fuel to be replenished and the available time interval.
  • the invention is therefore based on the object, a method for operating a fuel injection system with a number of injectors, in each of which a piezoelectric actuator via a hydraulic coupler drives a closing member to specify, with a particularly reliable fuel injection is ensured.
  • a particularly suitable for carrying out the method fuel injection system should be specified.
  • this object is achieved according to the invention by monitoring the terminal voltage after a charging process of an actuator and used to form a diagnostic statement for the respective injector, wherein the diagnosis statement is formed on the basis of the time decrease of the terminal voltage after completion of the charging process.
  • the invention is based on the consideration that the fuel injection system can be operated particularly reliably with regard to fuel injection by performing a direct and timely monitoring of the valve lift of the injection valves.
  • a diagnostic statement regarding its valve lift is formed promptly, that is, during or immediately after the current injection cycle, for each injection valve.
  • the terminal voltage at the piezoelectric actuator can thus be used without the need for a further sensor as a measurement parameter for the valve behavior with regard to the implementation of the control voltage in the valve.
  • the monitored terminal voltage is used to form a diagnostic statement about the fill level of the coupler of the respective injection valve.
  • the coupler pressure is dependent on the medium in the coupler, with the other external conditions remaining unchanged; so results in only partial filling of the coupler with fuel (effective medium: fuel-air mixture) in other pressure conditions than a complete filling of the coupler with fuel as a medium.
  • the characteristic of the pressure conditions in the coupler terminal voltage is particularly favorable for the fill level monitoring approached.
  • a particularly reliable diagnostic statement can be achieved by this invention is formed based on the time decrease of the terminal voltage after completion of the charging process.
  • the pressure in the hydraulic coupler degrades due to the outflowing medium again;
  • This pressure drop can be detected by monitoring the terminal voltage at the actuator in the form of a voltage reduction occurring as a function of time.
  • This voltage reduction depends to a particularly great extent on the degree of filling in the coupler: when the coupler is fully filled, a comparatively pronounced voltage dip can be detected. In contrast, this effect is significantly lower with only partially filled coupler, since in this case only air or an air-fuel mixture was compressed during charging.
  • the diagnostic statement is formed on the basis of a comparison of the difference between a first measured value for the terminal voltage immediately after the end of the charging process and a second measured value for the terminal voltage after expiry of a waiting time with a limit value.
  • a waiting time can be given a fixed value of advantageously about 0.25 ms.
  • the waiting time can also be selected as a function of parameters characteristic for the injection cycle, such as, for example, the activation duration or the duration of a break in injection between two injections.
  • the waiting time can be selected such that the second measured value is determined immediately before a following control intervention, for example an increase of the drive voltage.
  • the limit value is suitably selected on the basis of characteristic operating characteristics of the respective coupler, with a voltage value of approximately 25 to 30 V in particular being able to be specified as limit value.
  • the limit value can also be predetermined operating point-dependent by a central control unit, wherein advantageously a map obtained from a previous calibration measurement is used.
  • a fault is detected, it is possible to distinguish between the effects of the fault by comparison with another limit value: if the terminal voltage difference also falls below a second, even lower limit value or minimum value, a "fatal error" is diagnosed which, for example, triggers an immediate shutdown of the internal combustion engine can. On the other hand, if the terminal voltage difference lies below the first limit, but above the second limit value, then a simple fault is diagnosed which, although it permits further operation of the internal combustion engine, is stored in a on-board memory for later diagnostic purposes.
  • the diagnostic statement is used directly for a corrective intervention in the fuel injection system.
  • a target value for the drive voltage of the respective actuator for a subsequent injection cycle is specified in particular when determining a simple error based on the diagnostic statement, wherein the desired value is selected such that despite the detected insufficient filling of the coupler after activation results in the proposed valve.
  • the diagnostic device is expediently connected to a data storage module.
  • the advantages achieved by the invention are in particular that a timely and reliable diagnosis and functional monitoring of each injector is made possible by the evaluation of the terminal voltage in a simple manner and without additional design effort.
  • the fuel injection system can thus be operated particularly reliably, with minor deviations immediately corrective measures, for example, with regard to a tracking of the driving voltage for each actuator, can be made.
  • the injection valve 1 after FIG. 1 has a piezoelectric actuator 2, which comprises a number of series-connected piezo elements 4.
  • the actuator 2 is connected on the one hand with a housing wall 6, are passed through the terminals 7 of the actuator 2, and on the other hand with a servo piston 8 positively connected.
  • the actuating piston 8 terminates with its side facing away from the actuator 2 end face 9 from a hydraulic coupler 10.
  • the hydraulic coupler 10 in turn acts on a guided in a connecting channel 12 actuating piston 14, at the end remote from the coupler 10, a closing member 16 is arranged.
  • This is designed as a double-closing control valve. In a first closed position, which corresponds to a rest position of the actuator 2, it closes a first valve seat 18 of a valve chamber 20. In a second closed position, which corresponds to a maximum actuation of the actuator 2, the closing member 16 closes a second valve seat 22 of the valve chamber 20.
  • a passage in the second valve seat 22 of the valve chamber 20 is connected to a guide channel 24 which is connected on the input side via a connecting piece 26 to a pressure channel, not shown, of a common rail fuel supply system of a motor vehicle.
  • a nozzle needle 28 is arranged, which releases or closes a fuel outlet 30 of a branched off from the connecting piece 26 fuel passage 32 depending on an applied via the terminals 7 to the actuator 2 drive voltage Ua.
  • the connecting piece 26 with an inlet throttle 34 and the guide channel 24 are provided with an outlet throttle 36.
  • the injection valve 1 is, together with further injectors 1, part of a fuel injection system 40, as shown schematically in FIG FIG. 2 is shown.
  • the number of injectors provided for the fuel injection system 40 is dependent on the further requirements of the engine to be supplied, in particular, an injection valve 1 may be provided for each cylinder to be fed.
  • the fuel supply system 40 comprises a central control unit 44.
  • This in turn has a control module 46 which is connected via lines 48 to the terminals 7 of the injectors 1 switched off.
  • the control unit 44 includes a diagnostic unit 50, the to a number of the injectors 1 respectively associated and connected to the terminals 7 voltage measuring 52 is connected.
  • the control unit 44 has a data storage module 54.
  • the control unit 44 applies a drive voltage Ua to the terminals 7 of each injection valve 1 in an injection cycle via the drive module 46.
  • the actuator 2 of the controlled injection valve 1 expands in its longitudinal direction, so that the actuating piston 8 moves in the direction of the hydraulic coupler 10.
  • the actuating piston 14 with the closing member 16 arranged thereon also moves in the direction of the second valve seat 22.
  • a high pressure which may be in a common rail system, for example, between 200 and 1800 bar. This pressure acts against the nozzle needle 28 and keeps it closed, so that no fuel can escape through the fuel outlet 30.
  • the closing member 16 is moved from the first valve seat 18 to the second valve seat 22 or vice versa, then the pressure in the high pressure region of the guide channel 24 breaks down, so that the nozzle needle 28 in the direction of the valve chamber 20 back and releases the fuel outlet 30. In this case, fuel injection occurs in the associated cylinder.
  • the fuel injection system 40 is designed such that a direct and timely monitoring of all couplers 10 of the injectors 1 is made. For this purpose, a diagnostic statement regarding the respective hydraulic coupler 10 is formed promptly, that is, during or immediately after the current injection cycle, for each injection valve 1.
  • the control module 46 is disconnected from the terminals 7 of the actuator 2. Instead of the control module 46, the associated voltage measuring device 52 is connected to the terminals 7 of the actuator 2, the measured data are output to the connected diagnostic unit 50.
  • a monitoring of the terminal voltage Uk of the actuator 2 as a function of elapsing time is formed in the diagnostic unit 50.
  • a diagnostic statement is thus formed in the diagnostic unit 50 for the respective injection valve 1 in the following manner: after the charging phase of the actuator 2, the terminal voltage Uk is measured. After a waiting time of, for example, about 0.25 ms, the terminal voltage Uk is measured again. Then, the difference between the two measured values is formed and compared with a limit value. In the embodiment, a fixed limit value of about 30 V is given for this purpose; Alternatively, however, an operating point-dependent limit value from a map obtained by prior calibration and stored in the data storage module 54 can also be used.
  • the waiting time is chosen such that the measurement of the terminal voltage Uk immediately before a subsequent control intervention, namely before a further increase in the clamping voltage Uk occurs.
  • the diagnosis is based on a faulty refilling of the coupler 10.
  • a further comparison of the difference of the terminal voltages Uk is made with a second threshold or minimum value.
  • a "fatal error” is diagnosed which triggers, for example, an immediate shutdown of the internal combustion engine.
  • a simple fault is diagnosed which, although it permits further operation of the internal combustion engine, is stored in the data storage module 54 for later diagnostic purposes.
  • a desired value for the drive voltage Ua of the respective actuator 2 is also specified for a subsequent injection cycle, wherein the desired value is selected such that despite the detected insufficient filling of the coupler 10 after a control of the intended Valve lift results.

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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)

Claims (8)

  1. Procédé de gestion d'un système (40) d'injection de carburant qui présente plusieurs soupapes d'injection (1) dans lesquelles au moins un actionneur piézoélectrique (2) entraîne un élément de fermeture (16) par l'intermédiaire d'un accoupleur hydraulique (10),
    dans lequel, après une opération de charge de chaque actionneur (2), sa tension aux bornes (Uk) est surveillée et est utilisée pour former une conclusion de diagnostic sur l'état de remplissage de l'accoupleur (10) de chaque soupape d'injection (1) et
    dans lequel la conclusion de diagnostic est formée à l'aide de la diminution de la tension aux bornes (Uk) au cours du temps après que l'opération de charge s'est terminée.
  2. Procédé selon la revendication 1, dans lequel la différence entre la tension aux bornes (Uk) mesurée immédiatement après la fin de l'opération de charge et la tension aux bornes (Uk) mesurée après qu'une durée prédéterminée d'attente s'est écoulée est comparée à une valeur limite.
  3. Procédé selon la revendication 2, dans lequel, en fonction de la différence entre la tension aux bornes (Uk) mesurée immédiatement après la fin de l'opération de charge et la tension aux bornes (Uk) mesurée après qu'une durée d'attente prédéterminée s'est écoulée, une valeur de consigne de la tension de commande (Ua) de chaque actionneur (2) pour un cycle d'injection suivant est prédéterminée.
  4. Procédé selon les revendications 2 ou 3, dans lequel la durée d'attente sélectionnée est une durée d'environ 0,25 ms calculée à partir de la fin de l'opération de charge.
  5. Procédé selon l'une des revendications 2 à 4, dans lequel la valeur limite prédéterminée est une valeur fixe de tension d'environ 25 à 30 V.
  6. Procédé selon l'une des revendications 2 à 4, dans lequel la valeur limite prédéterminée est une valeur de tension qui dépend du point de fonctionnement et qui est déduite d'un champ de caractéristiques déterminé à l'aide d'un étalonnage préalable.
  7. Système (40) d'injection de carburant qui présente plusieurs soupapes d'injection (1) dans chacune desquelles un actionneur piézoélectrique (2) entraîne par l'intermédiaire d'un accoupleur hydraulique (10) un organe de fermeture (16), l'actionneur (2) de chaque soupape d'injection (1) étant relié à un système associé (52) de mesure de tension dont la sortie est raccordée à une unité de diagnostic (50), l'unité de diagnostic formant une conclusion de diagnostic sur l'état de remplissage de l'accoupleur (10) de chaque soupape d'injection (1) à l'aide de la diminution de la tension aux bornes (Uk) de l'actionneur (2) au cours du temps après que l'opération de charge s'est terminée.
  8. Système (40) d'injection de carburant selon la revendication 7, dont l'unité de diagnostic (50) est reliée à un module (54) de mémoire de données.
EP00113992A 2000-07-01 2000-07-01 Actionneur piézo-électrique pour injecteur Expired - Lifetime EP1167729B2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP00113992A EP1167729B2 (fr) 2000-07-01 2000-07-01 Actionneur piézo-électrique pour injecteur
DE50009866T DE50009866D1 (de) 2000-07-01 2000-07-01 Piezoelektrischer Aktor eines Einspritzventils

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00113992A EP1167729B2 (fr) 2000-07-01 2000-07-01 Actionneur piézo-électrique pour injecteur

Publications (3)

Publication Number Publication Date
EP1167729A1 EP1167729A1 (fr) 2002-01-02
EP1167729B1 EP1167729B1 (fr) 2005-03-23
EP1167729B2 true EP1167729B2 (fr) 2009-09-09

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ID=8169130

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EP00113992A Expired - Lifetime EP1167729B2 (fr) 2000-07-01 2000-07-01 Actionneur piézo-électrique pour injecteur

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EP (1) EP1167729B2 (fr)
DE (1) DE50009866D1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10239614A1 (de) 2002-08-29 2004-03-11 Robert Bosch Gmbh Verfahren zum Betreiben eines Kraftstoffeinspritzsystems, Computerprogramm sowie Steuer- und/oder Regelgerät zum Betreiben eines Kraftstoffeinspritzsystems und Brennkraftmaschine
DE10336639A1 (de) * 2003-08-08 2005-03-03 Robert Bosch Gmbh Verfahren und Vorrichtung zur Funktionsdiagnose eines Piezoaktors eines Kraftstoffzumesssystems einer Brennkraftmaschine
DE10349824A1 (de) * 2003-10-24 2005-06-02 Robert Bosch Gmbh Verfahren zur Diagnose einer Kraftstoff-Einspritzvorrichtung, welche einen Piezoaktor aufweist
DE102004007798A1 (de) * 2004-02-18 2005-09-08 Robert Bosch Gmbh Verfahren und Vorrichtung zum Bestimmen der Ladeflanken eines piezoelektrischen Aktors
EP1746318B1 (fr) * 2005-07-22 2007-11-14 Delphi Technologies, Inc. Méthode et dispositif pour surveiller et évaluer la fonction d'un déclencheur piézoélectrique
ES2294608T3 (es) * 2005-08-04 2008-04-01 Delphi Technologies, Inc. Procedimiento y dispositivo para vigilar y evaluar el funcionammiento de un actuador piezoelectrico.
EP1860312B1 (fr) * 2006-05-23 2009-03-18 Delphi Technologies, Inc. Procédé de fonctionnement d'un injecteur à carburant
DE102008027516B3 (de) * 2008-06-10 2010-04-01 Continental Automotive Gmbh Verfahren zur Einspritzmengenabweichungsdetektion und zur Korrektur einer Einspritzmenge sowie Einspritzsystem
DE102015208436B4 (de) * 2015-05-06 2019-09-05 Continental Automotive Gmbh Überwachungsverfahren und Überwachungsvorrichtung zur Überwachung eines Füllvorgangs einer Injektoranordnung mit einem Kraftstoff und Befüllungsverfahren zum Befüllen einer Injektoranordnung
GB2574229A (en) 2018-05-31 2019-12-04 Fas Medic Sa Method and apparatus for energising a solenoid of a valve assembly

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0464443A1 (fr) † 1990-06-18 1992-01-08 Toyota Jidosha Kabushiki Kaisha Dispositif de commande pour un élément piézoélectrique
WO2001063121A1 (fr) † 2000-02-11 2001-08-30 Delphi Technologies, Inc. Procede permettant de detecter des periodes d'injection dans un injecteur de carburant piezoelectrique

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19711903C2 (de) * 1997-03-21 1999-03-18 Siemens Ag Vorrichtung und Verfahren zum Ansteuern eines piezogesteuerten Kraftstoffeinspritzventils
DE19732802A1 (de) 1997-07-30 1999-02-04 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE19733560B4 (de) * 1997-08-02 2007-04-05 Robert Bosch Gmbh Verfahren und Vorrichtung zum Laden und Entladen eines piezoelektrischen Elements
DE19804196A1 (de) * 1998-02-03 1999-08-12 Siemens Ag Verfahren zur Auswertung von Kennwerten piezo-mechanischer Systeme
KR100638939B1 (ko) * 1998-06-25 2006-10-25 지멘스 악티엔게젤샤프트 용량성 액추에이터를 제어하기 위한 방법 및 상기 제어 방법 실행 장치

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0464443A1 (fr) † 1990-06-18 1992-01-08 Toyota Jidosha Kabushiki Kaisha Dispositif de commande pour un élément piézoélectrique
WO2001063121A1 (fr) † 2000-02-11 2001-08-30 Delphi Technologies, Inc. Procede permettant de detecter des periodes d'injection dans un injecteur de carburant piezoelectrique

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Publication number Publication date
DE50009866D1 (de) 2005-04-28
EP1167729B1 (fr) 2005-03-23
EP1167729A1 (fr) 2002-01-02

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