EP1387936A1 - Procede pour amorcer un actionneur piezoelectrique servant a deplacer un element - Google Patents

Procede pour amorcer un actionneur piezoelectrique servant a deplacer un element

Info

Publication number
EP1387936A1
EP1387936A1 EP02740314A EP02740314A EP1387936A1 EP 1387936 A1 EP1387936 A1 EP 1387936A1 EP 02740314 A EP02740314 A EP 02740314A EP 02740314 A EP02740314 A EP 02740314A EP 1387936 A1 EP1387936 A1 EP 1387936A1
Authority
EP
European Patent Office
Prior art keywords
actuator
voltage
parameter
value
idle stroke
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Withdrawn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
EP02740314A
Other languages
German (de)
English (en)
Inventor
Rainer Hirn
Arno Friedrich
Uwe Jung
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP1387936A1 publication Critical patent/EP1387936A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F02D2200/0602—Fuel pressure
    • 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
    • F02D2200/0606—Fuel temperature
    • 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

Definitions

  • the invention relates to a method for controlling a piezoelectric actuator, which is used to shift an element.
  • a control voltage is applied to the actuator.
  • the element is displaced due to the change in length of the actuator caused by the control.
  • a piezoelectric actuator is used, for example, in a fuel injector.
  • the element is a control valve which is actuated by the actuator.
  • the length of the piezoelectric actuator is temperature-dependent, there should be a safety distance, the so-called idle stroke, between the uncontrolled actuator and the element, which ensures that the uncontrolled actuator does not move the element even when the temperature changes.
  • the aim is to make the size of the empty stroke independent of environmental influences, since otherwise the element is moved to different degrees when the actuator is actuated, or in extreme cases not at all.
  • a change in the idle stroke for example, delays the start of injection and the end of injection, which can lead to high emissions and loud combustion noises.
  • Invar has proven to be a suitable material for a housing of the piezoelectric actuator.
  • this measure does not completely compensate for the temperature-related expansion of the actuator, since not all components surrounding the actuator can be produced from Invar.
  • the measure does not help with changes in the idle stroke due to non-temperature-related environmental influences.
  • the invention is based on the object of specifying a method for controlling an actuator which serves to shift an element, in which the displacement of the element is influenced to a lesser extent by environmental conditions than in the prior art.
  • the object is achieved by a method for controlling a piezoelectric actuator, which is used to shift an element, with the following features: There is an idle stroke between the actuator and the element. A control voltage is applied to the actuator to displace the element. The control voltage is selected so that it compensates for a change in the idle stroke from the
  • This method does not attempt to make the size of the idle stroke independent of environmental influences, but rather a change in the idle stroke is compensated for by a suitable control voltage.
  • the control voltage is chosen to be correspondingly larger so that the actuator can overcome the greater distance from the element and can move the element with the required force. Even the smallest changes in idle stroke can be compensated for by this method, so that the displacement of the element is essentially independent of environmental conditions. Since the change in the idle stroke can in principle be compensated for with this method regardless of its cause, the method is suitable for taking into account the influence of non-temperature-related changes. switch off world conditions on the displacement of the element.
  • the method is preferably carried out in such a way that the control voltage is formed from a sum of at least a first voltage and an equalizing voltage, only the equalizing voltage being dependent on the size of the idle stroke. Because the equalizing voltage is separated as the summand to be added, the method can be carried out with a particularly simple and clear device.
  • the device has, on the one hand, a basic value calculation that is always active and, on the other hand, a correction value calculation that is carried out depending on the environmental conditions.
  • the first voltage can be a fixed basic voltage.
  • the first voltage is preferably dependent on parameters, such as engine load, engine speed or fuel pressure, in order to determine the injection quantity, the start of injection and the end of injection to the current operating condition, such as, for example, B. start or roll out.
  • the value of a parameter is determined, which serves as a measure of the current size of the idle stroke.
  • the capacity of the actuator can be used for the parameter.
  • the parameter can be the capacity of the actuator. If several actuators are arranged in the same device and they perform essentially the same function, the parameter can instead be an average of the capacities of the actuators. This is e.g. B. the case with a multi-cylinder engine having one fuel injector per cylinder. It has been shown that the capacity of the actuator depends on the temperature of the actuator regardless of its activation. The temperature of the actuator can in turn be used to infer the temperature-related change in the idle stroke, so that the capacity of the actuator represents a measure of the size of the idle stroke. The use of such a parameter allows compensation for temperature-related changes in the idle stroke.
  • a valve is used as the element which regulates the injection quantity of fuel.
  • the fuel temperature can be used for the parameter.
  • the cooling water temperature can also be used for the parameter.
  • the runtime of the motor is also taken into account when determining the dependency of the control voltage on the value of the parameter, in that the temperature of the actuator is inferred from the cooling water temperature at the start time of the motor and from the current runtime of the motor.
  • a stored assignment of parameter values to compensation voltages can be used to determine the compensation voltage from the value of the parameter.
  • the assignment can be determined on the basis of a model actuator and then stored in all actuators manufactured in accordance with the model actuator. For this purpose, a number of different environmental conditions of the model actuator are set. The associated value of the parameter is determined for each of the environmental conditions. For each of the environmental conditions, the control voltage is determined at which the actuator actuates the element in the desired manner, for example with a certain force. If the first voltage is known, the compensation voltage can be determined from the control voltage. men. When used in a fuel injector, the compensation voltage can be determined by checking at which control voltage the correct amount of fuel is injected.
  • the value of the parameter for a certain environmental condition can differ from actuator to actuator for manufacturing reasons.
  • it is advantageous to determine the compensation voltage in the method for actuating the actuator in that the difference value from the value of the parameter and a fixed stored value is formed and then the corresponding compensation voltage is determined from a stored assignment of difference values to compensation voltages.
  • This assignment can also be determined using a model actuator. In this case, it is sufficient to adjust the value of the parameter under the same environmental condition under which the fixed stored value was measured for the model actuator and at
  • the above-mentioned environmental condition is preferably the state of the
  • Fuel injector at operating temperature since this environmental condition can be easily set without additional measurements by waiting a sufficient time after start-up until it is highly likely that the operating temperature of the fuel injector has been reached.
  • the control voltage required is calculated, for example, by a control unit.
  • the charging current with which the actuator is charged when actuated depends on the actuation voltage and, depending on the resistances and capacitances in the circuit of the control unit and the actuator. Since the charging current depends on the level of the control voltage, the expansion of the actuator is not proportional to the control voltage. However, the control energy with which the actuator is charged is proportional to the expansion of the actuator. The control energy is obtained by multiplying the control voltage by the charging current and by the charging time. It is therefore advisable to trace the determination of the control voltage to a calculation of the control energy. Since the charging current depends in an unambiguous and unchangeable manner on the control voltage and the charging time is independent of the control voltage, the relationship between control voltage and control energy is unambiguous. The drive voltage is consequently determined indirectly by determining the drive energy.
  • the first voltage and the compensation voltage can thus be determined indirectly by determining a first energy and a compensation energy.
  • the stored assignment of parameter values to compensation voltages can consist of a saved assignment of the parameter values to compensation energies.
  • Figure 1 shows a piezoelectric actuator with actuator housing and element.
  • FIG. 2 shows a flow diagram of a method for controlling the actuator.
  • each of the fuel injectors has a piezoelectric actuator A which serves to displace an element E which is designed as a control valve. Between the actuators A in the uncontrolled State and the elements E, a distance is provided, which is called the idle stroke L (see FIG. 1).
  • An electronic control unit which controls the actuators A.
  • a first assignment ZI between fuel pressure and a first energy and thus a first voltage S1 is stored in a map in the ECU.
  • the first assignment ZI specifies the actuation energies and thus the actuation voltages ANS, which are required in each case at operating temperature and at certain fuel pressures in order to achieve an optimal injection quantity.
  • a second map Z2 of difference values DW to compensation energies and thus compensation voltages AS is stored in a further characteristic diagram (see FIG. 2).
  • the capacitances C1, C2, C3, C4 of the actuators A are determined in a first step.
  • the mean value CM is formed from the capacitances C1, C2, C3, C4.
  • This mean value CM is subtracted from a fixed stored value W1 in order to form a difference value DW.
  • the fixed stored value Wl represents the mean value of the capacities at operating temperature, which is between 70 ° C and 90 ° C.
  • the associated balancing energy and thus balancing voltage AS are determined from the difference value DW.
  • the fuel pressure is measured.
  • the corresponding first energy and thus the first voltage S1 are determined from the fuel pressure.
  • the first energy and the first equalizing energy and thus the first voltage S1 and the equalizing voltage AS are then added in order to determine the actuation energy and thus the actuation voltage ANS of the actuators A.
  • the actuators A are actuated with this determined actuation energy or actuation voltage ANS in order to shift the elements E.

Landscapes

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

Abstract

Selon l'invention, il y a une course à vide entre un actionneur et un élément. Pour déplacer l'élément, l'actionneur (A) est soumis à l'action d'une tension d'amorçage (ANS), laquelle est sélectionnée de manière à dépendre de la grandeur de la course à vide, pour équilibrer une modification de cette course à vide.
EP02740314A 2001-05-14 2002-05-02 Procede pour amorcer un actionneur piezoelectrique servant a deplacer un element Withdrawn EP1387936A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10123372 2001-05-14
DE10123372A DE10123372B4 (de) 2001-05-14 2001-05-14 Verfahren zur Ansteuerung eines piezoelektrischen Aktors, der der Verschiebung eines Elements dient
PCT/DE2002/001596 WO2002092985A1 (fr) 2001-05-14 2002-05-02 Procede pour amorcer un actionneur piezoelectrique servant a deplacer un element

Publications (1)

Publication Number Publication Date
EP1387936A1 true EP1387936A1 (fr) 2004-02-11

Family

ID=7684713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02740314A Withdrawn EP1387936A1 (fr) 2001-05-14 2002-05-02 Procede pour amorcer un actionneur piezoelectrique servant a deplacer un element

Country Status (4)

Country Link
US (1) US6885131B2 (fr)
EP (1) EP1387936A1 (fr)
DE (1) DE10123372B4 (fr)
WO (1) WO2002092985A1 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1429445B1 (fr) * 2002-12-09 2009-08-12 Continental Automotive GmbH Procédé et dispositif de commande d'un actionneur piézoélectrique
DE10312712A1 (de) * 2003-03-21 2004-09-30 Robert Bosch Gmbh Steuergerät und Computerprogramm zum Ansteuern eines Kraftstoffventils einer Brennkraftmaschine
DE10331057B4 (de) * 2003-07-09 2006-12-28 Siemens Ag Verfahren und Vorrichtung zum Einstellen eines Leerhubs eines piezoelektrischen Aktors
DE10338282A1 (de) * 2003-08-20 2005-03-31 Siemens Ag Verfahren und Vorrichtung zum Positionieren eines piezoelektrischen Aktors
DE10349307B3 (de) * 2003-10-23 2005-05-25 Siemens Ag Diagnoseverfahren für einen elektromechanischen Aktor
DE102005001498B4 (de) * 2005-01-12 2007-02-08 Siemens Ag Verfahren und Vorrichtung zum Steuern eines Injektors
DE102006039522B4 (de) * 2006-08-23 2009-01-29 Continental Automotive Gmbh Verfahren zur Leerhubsteuerung einer Kraftstoffeinspritzvorrichtung
DE102008020931A1 (de) * 2008-04-25 2009-11-19 Continental Automotive Gmbh Verfahren zur Ansteuerung eines Piezoaktors in einem Kraftstoffinjektor
DE102008029799A1 (de) * 2008-06-24 2009-12-31 Continental Automotive Gmbh Ansteuerverfahren für Einspritzinjektoren bei direkteinspritzenden Brennkraftmaschinen
DE102008045955A1 (de) 2008-09-04 2010-03-11 Continental Automotive Gmbh Verfahren und Vorrichtung zur Korrektur einer temperaturbedingten Längenänderung einer Aktoreinheit, die im Gehäuse eines Kraftstoffinjektors angeordnet ist
DE102010004299B3 (de) * 2010-01-11 2011-01-27 Continental Automotive Gmbh Verfahren und Vorrichtung zum Betreiben von Injektoren mit Piezo-Antrieb
DE102010021168B4 (de) 2010-05-21 2020-06-25 Continental Automotive Gmbh Verfahren zum Betreiben einer Brennkraftmaschine und Brennkraftmaschine
DE102011089792B4 (de) * 2011-12-23 2021-06-10 Vitesco Technologies GmbH Verfahren zum Betreiben eines Kraftstoffinjektors
DE102012218610A1 (de) 2012-10-12 2014-04-17 Continental Automotive Gmbh Verfahren und Vorrichtung zur Herstellung eines Einspritzventils
FR3013392B1 (fr) * 2013-11-21 2017-12-29 Continental Automotive France Procede de surveillance d'un injecteur de carburant d'un moteur a combustion interne d'un vehicule
DE102023205424A1 (de) 2023-06-12 2024-04-18 Carl Zeiss Smt Gmbh Verfahren zum Betreiben eines Festkörperaktuators in einer mikrolithographischen Projektionsbelichtungsanlage

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Publication number Priority date Publication date Assignee Title
US4499878A (en) * 1982-10-25 1985-02-19 Nippon Soken, Inc. Fuel injection system for an internal combustion engine
JP2767959B2 (ja) * 1990-02-27 1998-06-25 日産自動車株式会社 ディーゼルエンジンの燃料噴射装置
DE19652801C1 (de) * 1996-12-18 1998-04-23 Siemens Ag Verfahren und Vorrichtung zum Ansteuern wenigstens eines kapazitiven Stellgliedes
DE19805184A1 (de) * 1998-02-10 1999-08-12 Bosch Gmbh Robert Verfahren und Vorrichtung zum Ermitteln der Temperatur eines piezoelektrischen Elements
DE19841460B4 (de) * 1998-09-10 2007-01-25 Siemens Ag Verfahren und Vorrichtung zum Ansteuern eines kapazitiven Stellglieds
DE19905340C2 (de) * 1999-02-09 2001-09-13 Siemens Ag Verfahren und Anordnung zur Voreinstellung und dynamischen Nachführung piezoelektrischer Aktoren
DE19931233B4 (de) * 1999-07-07 2007-02-01 Siemens Ag Verfahren zum Ansteuern eines kapazitiven Stellgliedes
DE10012607C2 (de) 2000-03-15 2002-01-10 Siemens Ag Verfahren zur Ansteuerung eines kapazitiven Stellgliedes
DE10016476A1 (de) * 2000-04-01 2001-12-06 Bosch Gmbh Robert Verfahren zur Diagnose der Spannungsansteuerung für einen piezoelektrischen Aktor eines Einspritzventils
DE60043181D1 (de) * 2000-04-01 2009-12-03 Bosch Gmbh Robert Verfahren und Vorrichtung zur Regelung von Spannungen und Spannungsgradienten zum Antrieb eines piezoelektrischen Elements

Non-Patent Citations (1)

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Title
See references of WO02092985A1 *

Also Published As

Publication number Publication date
DE10123372A1 (de) 2002-12-05
US20040145274A1 (en) 2004-07-29
WO2002092985A1 (fr) 2002-11-21
US6885131B2 (en) 2005-04-26
DE10123372B4 (de) 2006-12-28

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