WO2004001794A2 - Procede de commande et de reglage de la longueur d'un actionneur piezo-electrique (pa) et unite electronique destinee a la commande du procede - Google Patents

Procede de commande et de reglage de la longueur d'un actionneur piezo-electrique (pa) et unite electronique destinee a la commande du procede Download PDF

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Publication number
WO2004001794A2
WO2004001794A2 PCT/IB2003/004600 IB0304600W WO2004001794A2 WO 2004001794 A2 WO2004001794 A2 WO 2004001794A2 IB 0304600 W IB0304600 W IB 0304600W WO 2004001794 A2 WO2004001794 A2 WO 2004001794A2
Authority
WO
WIPO (PCT)
Prior art keywords
pma
voltage
length
piezo
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.)
Ceased
Application number
PCT/IB2003/004600
Other languages
German (de)
English (en)
Other versions
WO2004001794A3 (fr
Inventor
Georg Bachmaier
Bernhard Fischer
Bernhard Gottlieb
Andreas Kappel
Hans Meixner
Randolf Mock
Tim Schwebel
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO2004001794A2 publication Critical patent/WO2004001794A2/fr
Publication of WO2004001794A3 publication Critical patent/WO2004001794A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
    • H02N2/06—Drive circuits; Control arrangements or methods
    • H02N2/062—Small signal circuits; Means for controlling position or derived quantities, e.g. for removing hysteresis
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/802—Circuitry or processes for operating piezoelectric or electrostrictive devices not otherwise provided for, e.g. drive circuits

Definitions

  • the invention relates to all directly driven high: pressure injection valves or valves with no hydraulic power transmission member such as bearings or translator for direct fuel injection, in which a working chamber is filled with the necessary for operating the high-pressure and a piezoelectric multilayer actuator (PMA) in the electrical control by elongation directly opens a servo valve or a nozzle needle or any other directly driven metering valve.
  • PMA piezoelectric multilayer actuator
  • This working principle is currently used in many high-pressure injection valves for diesel direct injection.
  • the injector itself may even leak. In this case, fuel is injected into the combustion chamber in an uncontrolled manner.
  • thermo gap means that there is a gap of approx. 5 ⁇ m between the end of the PMA and the servo valve as a buffer for tuning errors. In cases where this measure is insufficient, the problem has not yet been solved.
  • FIG. 1 schematically shows the function of the piezo actuator in the piezo diesel high-pressure injection valve when the servo valve is opened.
  • the servo valve is closed in the idle state.
  • the piezo actuator lengthens when an external electrical field is applied, which acts in the direction of the preferred polarization of the piezo ceramic. This orientation of the external electric field is simply referred to as positive and the opposite orientation as negative voltage.
  • the piezo actuator first overcomes the thermal gap, i. H. the safety distance for different thermal dilations, and then presses on the servo valve.
  • the thermal gap i. H. the safety distance for different thermal dilations
  • the high-pressure injector opens because the pressure in the working chamber (no longer shown) of the high-pressure injector drops.
  • the length of the piezo actuator and the housing for the piezo actuator can change by a few ⁇ m relative to one another. That is why the so-called "thermal gap" between the servo valve and the piezo actuator is left blank during production.
  • the length of the piezo actuator depends not only on the temperature but also on the state of polarization, and from its history (hysteresis). These processes can also change the coefficient of thermal expansion of the piezo actuator. It is therefore possible that the tolerance band for the thermal gap of 3-5 ⁇ m is left over time.
  • Figure 2 shows the worst case of pressure leakage on the servo valve. It can mean that the high pressure pump (not shown) can no longer build up the necessary pressure in the working chamber and the piezo diesel high pressure injector fails.
  • the piezo actuator reacts to the application of an external electric field, which acts against the direction of preferential polarization of the piezoceramic, just as it reacts to a positive voltage with an extension. It is therefore possible to restore the ideal state of FIG. 1 by applying a negative electrical voltage.
  • the aim of the invention is to eliminate the disadvantages of the prior art.
  • the operating area of the PMA which has to perform an elongation for shutdown, is additionally affected by negative voltages extended so that its length can be varied in both directions (lengthening and shortening).
  • This scope in the characteristics of a piezoceramic is large enough to shorten the PMA to such an extent that the high-pressure injection valve can be put into operation again, or the servo valve with the control chamber can be securely closed without the polarities in the ceramic being reversed.
  • This scope is large enough to shorten the PMA to such an extent that the high-pressure injector can be put into operation again.
  • the negative voltage only needs to be applied if necessary, such as a restart after excessive heating or the like.
  • the electrical control of the high-pressure injection valve can take place in a conventional manner.
  • the process can be regulated.
  • the negative voltage can be increased slowly until the high pressure injector starts. This avoids unnecessarily large field strengths.
  • the invention presents a simple solution that can be used without great effort and without the functionality of the current hasten control electronics to enable an individually adjustable offset voltage for each actuator.
  • the solution described here provides for the circuit to be expanded by a capacitance, a resistor and a more controllable voltage source, as shown in FIG. 3.
  • the capacitive voltage divider reduces the voltage that drops at the injector according to the following relationship:
  • the resistance R x determines the time constant with which the potential at the node Ci, Cinjetor and Ri is balanced.
  • FIG. 4 shows how the voltage profile of a current-controlled output stage can look for the procedure according to the invention.
  • the circuitry is low.
  • the offset voltage is independent of the operating state of the injector, it can be applied and changed during the start phase and during operation.
  • the capacitance Ci only requires a rather low dielectric strength.
  • the terminal behavior remains almost the same, so no further changes to the control electronics are necessary.
  • 19 shows the measurement sequence for the fourth cycle, in which the PMA is operated for the first time with at least -20 V,
  • FIG. 20 shows the measurement sequence for step 4, corresponding to FIG. 19, in the hysteresis figure shown.
  • Cycles 2-4 were repeated to further investigate the creep behavior and hysteresis of the PMA. Since the existing electronics are not designed for negative voltages, a tool was used to represent this voltage range. The measurement in the positive branch was started, e.g. B. at 0 V to +160 V and again to 0 V.
  • the shortening is about 2 ⁇ m. Due to the hysteresis, the PMA is still shortened by 1 ⁇ m at 0 V.
  • the shortening is already -7 ⁇ m.
  • the oval of the hysteresis curve is not closed on the first cycle down to -20 V.
  • the hysteresis now shows itself in the usual form of a closed oval curve.
  • Fig. 16 The first cycle down to -30 V is shown. The shortening reaches -10 ⁇ m.
  • Fig. 17 The second cycle to -0 V is shown.
  • the hysteresis is again shown in the usual form of a closed oval curve.
  • Fig. 18 Double polarization of a diesel piezo stack:
  • the polarity reversal begins between -70 V and -80 V and, for reasons of symmetry, the polarity is reversed again at +70 V to +80 V, the piezo stack is not shortened further.
  • the outer field and preferred polarization direction point in the same direction again, which again leads to an elongation of the piezo stack.
  • the available area up to the polarity reversal can be used precisely to shorten the PMA.
  • Figure 18 shows that a shortening of about 40 microns is possible. This is sufficient to solve the problem of pressure leakage in the diesel injector, which is known to be due to an adaptation error of just a few micrometers.
  • the measurement sequence of FIG. 19 is shown in the hysteresis curve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

L'invention concerne un procédé de commande d'actionneurs piézo-électriques (PA), notamment d'actionneurs multicouches piézo-électriques (PMA), une tension positive étant régulièrement appliquée auxdits actionneurs en utilisation afin que ceux-ci s'allongent. Dans certains états d'utilisation définis des actionneurs multicouches piézo-électriques, ceux-ci reçoivent également une tension négative limitée ou une tension de décalage, ne modifiant pas la polarité des actionneurs, de manière à ramener ces derniers dans une position initiale pouvant être définie.
PCT/IB2003/004600 2002-06-24 2003-06-20 Procede de commande et de reglage de la longueur d'un actionneur piezo-electrique (pa) et unite electronique destinee a la commande du procede Ceased WO2004001794A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10228146A DE10228146A1 (de) 2002-06-24 2002-06-24 Verfahren zur Ansteuerung und Längeneinstellung eines piezoelektrischen Aktors (PA) und elektronische Einheit zur Steuerung des Verfahrens
DE10228146.7 2002-06-24

Publications (2)

Publication Number Publication Date
WO2004001794A2 true WO2004001794A2 (fr) 2003-12-31
WO2004001794A3 WO2004001794A3 (fr) 2004-07-22

Family

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PCT/IB2003/004600 Ceased WO2004001794A2 (fr) 2002-06-24 2003-06-20 Procede de commande et de reglage de la longueur d'un actionneur piezo-electrique (pa) et unite electronique destinee a la commande du procede

Country Status (2)

Country Link
DE (1) DE10228146A1 (fr)
WO (1) WO2004001794A2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7301256B2 (en) 2004-08-18 2007-11-27 Siemens Aktiengesellschaft Method and circuit configuration for operating a piezoelectric actuator
WO2009130096A1 (fr) * 2008-04-25 2009-10-29 Continental Automotive Gmbh Procédé d'amorçage d'actionneur piézoélectrique dans un injecteur de carburant
US9502633B2 (en) 2012-05-23 2016-11-22 Continental Automotive France Method for current-controlling at least one piezoelectric actuator of a fuel injector of an internal combustion engine
US9745930B2 (en) 2013-07-29 2017-08-29 Continental Automotive France Method and device for repolarizing a piezoelectric actuator of an injector of an internal combustion engine of a used vehicle
US9828956B2 (en) 2013-02-26 2017-11-28 Continental Automotive France Method for controlling a piezoelectric fuel injector of an internal combustion engine of a vehicle comprising a step for polarizing the piezoelectric actuator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008013590A1 (de) * 2008-03-11 2009-09-24 Epcos Ag Verfahren zum Betrieb eines Piezoelements
DE102010021448A1 (de) * 2010-05-25 2011-12-01 Continental Automotive Gmbh Verfahren und Vorrichtung zur Regelung der elektrischen Polarisation eines piezoelektrischen Aktuators

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3274047B2 (ja) * 1995-10-05 2002-04-15 株式会社豊田中央研究所 圧電アクチュエータの駆動装置および駆動方法
JP3758325B2 (ja) * 1997-08-07 2006-03-22 日産自動車株式会社 燃料噴射弁の調整装置及び製造方法
US6201336B1 (en) * 1998-06-12 2001-03-13 Ocean Power Technologies, Inc. DC bias scheme for field induced piezoelectric power generators
DE19905340C2 (de) * 1999-02-09 2001-09-13 Siemens Ag Verfahren und Anordnung zur Voreinstellung und dynamischen Nachführung piezoelektrischer Aktoren
US6400066B1 (en) * 2000-06-30 2002-06-04 Siemens Automotive Corporation Electronic compensator for a piezoelectric actuator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7301256B2 (en) 2004-08-18 2007-11-27 Siemens Aktiengesellschaft Method and circuit configuration for operating a piezoelectric actuator
WO2009130096A1 (fr) * 2008-04-25 2009-10-29 Continental Automotive Gmbh Procédé d'amorçage d'actionneur piézoélectrique dans un injecteur de carburant
US9502633B2 (en) 2012-05-23 2016-11-22 Continental Automotive France Method for current-controlling at least one piezoelectric actuator of a fuel injector of an internal combustion engine
US10177299B2 (en) 2012-05-23 2019-01-08 Continental Automotive France Method for controlling at least one piezoelectric actuator of a fuel injector of an internal combustion engine
US9828956B2 (en) 2013-02-26 2017-11-28 Continental Automotive France Method for controlling a piezoelectric fuel injector of an internal combustion engine of a vehicle comprising a step for polarizing the piezoelectric actuator
US9745930B2 (en) 2013-07-29 2017-08-29 Continental Automotive France Method and device for repolarizing a piezoelectric actuator of an injector of an internal combustion engine of a used vehicle

Also Published As

Publication number Publication date
DE10228146A1 (de) 2004-05-27
WO2004001794A3 (fr) 2004-07-22

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