EP1488089B1 - Procede et dispositif de commande de l'actionneur piezoelectrique de la soupape de distribution piezoelectrique d'une unite de pompe d'injection - Google Patents

Procede et dispositif de commande de l'actionneur piezoelectrique de la soupape de distribution piezoelectrique d'une unite de pompe d'injection Download PDF

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Publication number
EP1488089B1
EP1488089B1 EP03727149A EP03727149A EP1488089B1 EP 1488089 B1 EP1488089 B1 EP 1488089B1 EP 03727149 A EP03727149 A EP 03727149A EP 03727149 A EP03727149 A EP 03727149A EP 1488089 B1 EP1488089 B1 EP 1488089B1
Authority
EP
European Patent Office
Prior art keywords
piezo
control valve
pressure
current pulse
current
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
EP03727149A
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German (de)
English (en)
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EP1488089A1 (fr
Inventor
Ralf Marohn
Richard Pirkl
Walter Schrod
Peter Voigt
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 Mechatronic Germany GmbH and Co KG
Original Assignee
Volkswagen Mechatronic GmbH and Co KG
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 Volkswagen Mechatronic GmbH and Co KG filed Critical Volkswagen Mechatronic GmbH and Co KG
Publication of EP1488089A1 publication Critical patent/EP1488089A1/fr
Application granted granted Critical
Publication of EP1488089B1 publication Critical patent/EP1488089B1/fr
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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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • 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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped

Definitions

  • the invention relates to a method and a device for Actuation of the piezo actuator during the closing process of a Piezo control valve of a unit injector.
  • Pump-nozzle units serve to supply fuel in a combustion chamber of an internal combustion engine. It can For example, it is a pump-nozzle unit with a Controllable and / or controllable fuel pump, a fuel injector, one between a closed position and an open position reciprocating nozzle needle comprising a first pressure space provided by the fuel pump can be filled with fuel under a first pressure is, a second pressure chamber, wherein in the second pressure chamber under a second pressure fuel a closing force on the nozzle needle, and a third pressure chamber, which communicates with the first pressure chamber, wherein in the third Pressure chamber under a third pressure standing fuel exerts an opening force on the nozzle needle act.
  • a Controllable and / or controllable fuel pump a fuel injector, one between a closed position and an open position reciprocating nozzle needle comprising a first pressure space provided by the fuel pump can be filled with fuel under a first pressure is, a second pressure chamber, wherein in the second pressure chamber under a second pressure fuel a closing force on the nozzle needle,
  • unit injector units are associated with used pressure-controlled injection systems.
  • An essential Feature of a pressure-controlled injection system consists in that the fuel injector opens as soon as a at least from the currently prevailing pressure influenced opening force is exerted on the nozzle needle.
  • pressure controlled Injection systems are used for fuel metering, the fuel preparation, the shaping of the course of injection and a seal of the fuel supply against the Combustion chamber of the internal combustion engine.
  • pressure controlled Injection systems can be the time course of the flow rate during the injection in an advantageous manner Taxes. This can have a positive impact on performance, the fuel consumption and the pollutant emission of the engine be taken.
  • the fuel pump and the Fuel injector usually as an integrated component educated.
  • At least one pump-nozzle unit is provided, which in usually installed in the cylinder head.
  • the fuel pump typically includes one in a fuel pump cylinder reciprocating fuel pump piston, either directly via a pestle or indirectly via Rocker arm driven by a camshaft of the internal combustion engine becomes.
  • the usually forming the first pressure chamber Section of the fuel pump cylinder is via a control valve connectable to a low pressure fuel area, with the control valve open, fuel from the low-pressure fuel area sucked into the first pressure chamber and with the control valve still open from the first Pressure chamber pushed back into the low-pressure fuel area becomes.
  • control valve in the form of a solenoid valve provided.
  • solenoid valves usually have a relatively long response time, which in particular is caused by the fact that the armature of a solenoid valve due to the mass inertia forces dependent on its mass can not be accelerated arbitrarily fast. Farther also requires the construction of the magnetic field to generate the Tightening time.
  • One equipped with a solenoid valve Pump-nozzle unit is for example from EP 0 277 939 B1 known.
  • an additional pilot injection and / or an additional Is to introduce post-injection quantity into the combustion chamber is It continues to be known during several injection cycles at short intervals successive injection pulses trigger.
  • From US 5,057,734 A is a method for driving a Piezo actuator during the closing process of a piezo control valve a unit injector known, wherein the control of the Piezo actuator by a first current pulse by discharging a first capacitor and a time with this subsequent second current pulse by discharging a second capacitor comprises.
  • the piezoelectric Actuators in two stages become two thyristors each uses a capacitor via an LC resonant circuit connect with the piezoelectric actuator.
  • the Voltage curve at the piezoelectric actuator has due the abrupt control of the current through the thyristors a discontinuous course.
  • Au ground the unsteady energization also has the force from the piezoelectric actuator is exerted on the closing member, also a discontinuous Course on. Due to the discontinuous force curve becomes the piezoelectric actuator and the control valve of a exposed to relatively high stress.
  • DE 199 21 456 A1 discloses a method and a device for driving a piezoelectric actuator known, the also abrupt changes in the curve of the current pulses used in the control of the piezoelectric actuator.
  • the charging of the piezoelectric actuator is with it abruptly changing currents, so no steady current curve is achieved.
  • a steady current curve is also due to the digital control of the piezoelectric Actors not possible.
  • the invention is based on the object, the generic To develop methods and devices such that unwanted Preller avoided when closing a piezo control valve or at least reduced.
  • the inventive method is based on the generic State of the art in that the control at least a first current pulse and this one with a time interval subsequent second current pulse comprises. It will the valve needle of the piezo control valve with the first current pulse set in motion.
  • the curve of the current pulses is with a performed analog control and has a steady Course on.
  • By the inventive control is a bouncing of the valve needle after reaching the valve seat avoided or at least reduced, resulting in lower Pressure oscillations in the element space as well as a smaller one Cavitation in the Ab Kunststoff- and actuator space result.
  • Control is in the present context in particular understand the charging of the piezo actuator. Such Charging is inventively in at least two charge packets divided, with different charge contents possible are.
  • the method according to the invention can be further provided that between the first Current pulse and the second current pulse a partial flow level is maintained.
  • the height of the partial flow level can be vary for different operating conditions. Farther It can, as well as the course of the first current pulse and / or the second current pulse, to adapt the control used to different piezo control valve types become.
  • control current-controlled and / or controlled in particular transformer-based.
  • CC control Current Control / current control
  • the device of the invention is based on the generic State of the art in that they are for driving at least a first current pulse and a temporal Distance subsequent second current pulse generated.
  • to Control is an analog amplifier used, the one steady curve of the current pulses realized.
  • the device according to the invention can be provided that they are between the first Current pulse and the second current pulse a partial flow level maintains.
  • the device according to the invention has at least one analog amplifier.
  • control is current regulated and / or controlled, in particular transformer-supported.
  • the invention is based on the finding that via the electrical Actuation of the piezo actuator the movement of the coupled valve mechanism can be modeled. For example can be electrically acted upon the valve needle course be, in particular for deflection and seat strength.
  • FIG. 1 shows schematically a pump-nozzle unit.
  • the illustrated pump-nozzle unit for supplying fuel 10 into a combustion chamber 12 of an internal combustion engine has a fuel pump 14-22.
  • a fuel pump piston 14 in a fuel pump cylinder 16 is movable back and forth.
  • the fuel pump piston 14 is driven directly or indirectly via a camshaft, not shown, of the internal combustion engine.
  • the compression space of the fuel pump cylinder 16 forms a first pressure chamber 28.
  • the first pressure chamber 28 is connected via a fuel line 20 to a piezo control valve 22.
  • the piezo control valve 22 serves to either close the fuel line 20 or to connect it to a fuel low-pressure region 18, from which fuel 10 can be sucked.
  • the illustrated unit injector further includes a fuel injector, generally designated 24, which has a nozzle needle 46 reciprocable between a closed position and an open position.
  • a pressure pin 26 can, in relation to the representation of FIG. 1, in particular exert a downward force on the nozzle needle 46.
  • a shim 40 is provided, which is guided in a second pressure chamber 30, wherein in the second pressure chamber 30 at a second pressure p 30 standing fuel 10 via the pressure pin 26 with respect to the illustration of Figure 1 down directed closing force on the nozzle needle 46 exerts.
  • the shim 40 is preferably only so strongly sealed relative to the second pressure chamber 30 that the second pressure p 30 is already degraded before the start of a new injection cycle.
  • a further downwardly directed further closing force is exerted by a first spring 36 on the pressure pin 26 and thus the nozzle needle 46, wherein the first spring 36 is disposed in the second pressure chamber 30 and is supported with its rear end on the dial 40.
  • a shoulder 44 having a portion of the nozzle needle 46 is surrounded by a third pressure chamber 32 which communicates with the first pressure chamber 28 via a connecting line 42.
  • a third pressure p 32 is built up in the third pressure chamber 32 as a function of the first pressure p 28 prevailing in the first pressure chamber 28.
  • the standing in the third pressure chamber 32 under the third pressure p 32 fuel 10 exerts a reference to the illustration of Figure 1 upward opening force on the nozzle needle 46.
  • the nozzle needle 46 assumes its open position as long as a difference between the opening force caused by the third pressure p 32 and the sum of the closing force generated by the second pressure p 30 and the closing force generated by the first spring 36 exceeds a predetermined value.
  • the nozzle opening pressure can be influenced via the second pressure p 30 in the second pressure chamber 30.
  • a pressure limiting and holding valve 34 may be provided between the first pressure chamber 28 and the second pressure chamber 30.
  • the coupling of an embodiment of the device 80 according to the invention to the piezo control valve 22 explained in more detail with reference to FIGS. 2a and 2b is also shown in FIG.
  • FIG. 2a shows a schematic partial sectional view of a Piezo control valve 22, the flow direction of the high pressure area closes to the low pressure area and with the unit injector unit can be used according to FIG.
  • the illustrated Piezo control valve 22 has a valve needle 48th on, for closing the piezo control valve 22 in the illustrated first end position and to fully open the Piezo control valve 22 are moved to a second end position can, which moved relative to the presentation to the right is.
  • the valve needle 48 in its illustrated first end position acts on the valve needle 48 provided valve plate 64 with a housing-side Valve seat 62 together. This will be the fuel low pressure area 18 closed against a high-pressure chamber 38, those with the fuel line shown in Figure 1 20 communicates.
  • the piezo control valve 22 has a piezo actuator or a piezoelectric element 76 on. With suitable control of the piezoelectric element 76 exercises this on an end face 78 a force on a pressure piece 54 off.
  • the pressure piece 54 transmits those of the piezoelectric element 76 generated force in turn on a first lever 56 and a second lever 58, wherein the first lever 56 and the second levers 58 are provided for a power transmission to effect.
  • the first lever 56 and the second lever 58 are located at a second axial end surface 72 of the valve needle 48 to the translated force generated by the piezo element 76 to transfer to the valve needle 48.
  • the suitable of the actuated piezoelectric element 76 generated, translated force, the acting on the valve needle 48 is greater than an opposite one Force generated by a second spring 66 and over a spring pressure piece 68 on a first axial end surface 70 of valve needle 48 is exercised.
  • the low-pressure fuel area 18 communicates with a spill space 50 the via a balancing bore 52 continues with a Actuator 74 located in front of the piezoelectric element 76 in connection stands.
  • This actuator chamber 74 is connected to a return line 60 in connection, via the fuel from the actuator chamber 74th can flow back.
  • FIG 2b shows a schematic partial sectional view of a Piezo control valve 22, opposite to the flow direction from high pressure to low pressure and also used with the pump-nozzle unit of Figure 1 can be. Due to the fact that in Figure 2b shown piezo control valve 22 opposite to the flow direction from the high pressure area to the low pressure area closes, this piezo control valve 22 ensures a higher Security against possible jamming. Also in 2b illustrated piezo control valve 22 has a valve needle 48 on which the closing of the piezo control valve 22 in the illustrated first end position and the full Opening the piezo control valve 22 in a second end position can be moved, based on the representation of FIG 2b is shifted to the right.
  • valve needle 48 When the valve needle 48 is in its illustrated first end position, acts again a provided on the valve needle 48 valve plate 64th with a housing-side valve seat 62 together. Thereby is the fuel-low pressure region 18 and the Abêtraum 50 against a high pressure chamber 38 closed, those with the fuel line shown in Figure 1 20 communicates.
  • the piezo control valve 22 points again a piezo actuator or a piezo element 76 on, via an end face 78 and a pressure piece 54 a Force on a second axial end surface 72 of the valve needle 48th exercises.
  • the suitably controlled by the piezoelectric element 76th generated, translated force acting on the valve needle 48 is greater than an opposite force, which is also at this Embodiment produced by a second spring 66 and on a first axial end surface 70 of the valve needle 48 exerted becomes. Since the piezo control valve shown in Figure 2b 22 in contrast to the piezo control valve shown in Figure 2a 22 in the flow direction from the high-pressure region 38 to the low-pressure region 18 or to the diversion chamber 50 opens, exerts in the high pressure chamber 38 existing higher Pressure an opening force on the valve needle 48, so that an undesirable jamming of this valve needle 48 especially can be safely avoided.
  • FIG. 3 shows an example of the course of the piezo drive current i (t) for closing the piezo control valve 22 according to the prior art, with analog control
  • FIG. 4 shows a second example of the course of the piezo drive current i (t) for closing the piezo control valve 22 according to the prior art, with CC control. If that Piezo element or the piezo actuator 76 of the Figures 2a and 2b for closing the piezo control valve 22nd with one of the piezo drive current profiles shown in FIGS. 3 or 4 it can be controlled when striking the valve needle 48 on the valve seat 62 to the beginning explained Preller and the associated problems come.
  • FIG. 5 shows a first embodiment of the activation of the piezoactuator 76 according to the invention for closing the piezo control valve 22.
  • the current profile i (t) shown in FIG. 5 has a first current pulse I 1 and a subsequent second current pulse I 2 spaced therefrom , Between the first current pulse I 1 and the second current pulse I 2 , a partial current level I T is maintained.
  • the continuous curve shown in Figure 5 can be realized in particular by an analog control.
  • FIG. 6 shows a second embodiment of the actuation of the piezoactuator 76 according to the invention for closing the piezo control valve 22.
  • the current waveform i (t) shown in FIG. 6 also has a first current pulse I 1 and a second current pulse I 2 following this time interval , In the embodiment shown in Figure 6, no partial flow level is maintained between the first current pulse I 1 and the second current pulse I 2 .
  • the first current pulse I 1 and the second current pulse I 2 are each composed by a plurality of directly successive short current pulses, as is the case in particular with a CC drive.
  • FIG. 7 shows a graph showing the course of the piezo drive current i (t), the piezo voltage u (t), the valve needle stroke h (t), the high-pressure space pressure t 38 (t) and the pressure in the outlet region of the pump nozzle Illustrated unit for a control according to the prior art and two drive variants according to the invention, wherein Figure 8 shows a temporal section of the waveforms of Figure 7.
  • the curves which result in a drive corresponding to the prior art are each designated by a, the piezo drive current i (t) being shown inverted in this case.
  • the curves which result for a first embodiment of the drive according to the invention are denoted by b, while the curves which result for a second embodiment of the drive according to the invention are denoted by c.
  • the curve b of the piezo drive current i (t) has a somewhat higher partial current level I T than the curve c.
  • the first current pulse I 1 the system is greatly accelerated at the beginning. In the middle region, to which the partial flow level I T is maintained, no further energy is required. In order to generate a high closing force, the energy is increased towards the end by the second current pulse I 2 again (see area A of FIG. 7).
  • valve needle stroke h (t) shown in FIG. 8 is particularly clear that a plunger is significantly reduced by a gentle closing of the valve needle 48, whereby the pressure drop of the high-pressure chamber pressure p 38 (t) is reduced (see region D of FIG 8th).
  • a plunger is significantly reduced by a gentle closing of the valve needle 48, whereby the pressure drop of the high-pressure chamber pressure p 38 (t) is reduced (see region D of FIG 8th).
  • current i (t) and voltage u (t) there is still an excess of current i (t) and voltage u (t), so that a greater force is available to seal the valve needle 48 (see region E of Figure 8).
  • FIG. 9 shows a graph which illustrates the course of the piezo voltage u (t), the valve needle stroke h (t) and the purge chamber pressure p 50 (t) when the piezo control valve 22 or the valve needle 48 is opened inadvertently.
  • the invention can be summarized as follows: To close the piezo-control valve 22 of a pump-nozzle unit, the piezo-actuator 76 is driven instead of a Einpulsstromwees with at least a first current pulse I 1 and a second current pulse I 2 following this with a time interval. As a result, a bouncer can be avoided or at least reduced when the valve needle 48 strikes the valve seat 62. Optionally, a partial flow level I T is maintained between the first current pulse I 1 and the second current pulse I 2 .

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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 (6)

  1. Procédé d'activation d'un actionneur piézoélectrique (76) lors du processus de fermeture d'une soupape de commande piézoélectrique (22) d'un ensemble unitaire à pompe et à buse,
    l'activation englobant au moins une première impulsion de courant (I1) et une seconde impulsion de courant (I2) succédant à cette dernière avec temporisation,
    caractérisé par le fait que l'allure des courbes des impulsions de courant présente une allure constante sous l'effet d'une activation analogique.
  2. Procédé selon la revendication 1,
    caractérisé par le fait qu'un niveau de courant partiel (IT) est entretenu entre la première impulsion de courant (I1) et la seconde impulsion de courant (I2).
  3. Procédé selon la revendication 1 ou 2,
    caractérisé par le fait que l'activation a lieu par l'intermédiaire de dispositifs de branchement renfermant au moins un amplificateur analogique.
  4. Procédé selon l'une des revendications précédentes,
    caractérisé par le fait que l'activation a lieu avec régulation et/ou commande de courant, notamment avec l'assistance d'un transformateur.
  5. Dispositif d'activation d'un actionneur piézoélectrique (76) lors du processus de fermeture d'une soupape de commande piézoélectrique (22) d'un ensemble unitaire à pompe et à buse, ledit dispositif générant, en vue de l'activation, au moins une première impulsion de courant (I1) et une seconde impulsion de courant (I2) succédant à cette dernière avec temporisation,
    caractérisé par le fait qu'il est prévu un amplificateur analogique provoquant une allure de courbes constante des impulsions de courant (I1, I2).
  6. Dispositif selon la revendication 5,
    caractérisé par le fait qu'il entretient un niveau de courant partiel (IT) entre la première impulsion de courant et la seconde impulsion de courant.
EP03727149A 2002-03-28 2003-03-21 Procede et dispositif de commande de l'actionneur piezoelectrique de la soupape de distribution piezoelectrique d'une unite de pompe d'injection Expired - Lifetime EP1488089B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10214206 2002-03-28
DE10214206 2002-03-28
PCT/DE2003/000956 WO2003083278A1 (fr) 2002-03-28 2003-03-21 Procede et dispositif de commande de l'actionneur piezoelectrique de la soupape de distribution piezoelectrique d'une unite de pompe d'injection

Publications (2)

Publication Number Publication Date
EP1488089A1 EP1488089A1 (fr) 2004-12-22
EP1488089B1 true EP1488089B1 (fr) 2005-12-21

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EP03727149A Expired - Lifetime EP1488089B1 (fr) 2002-03-28 2003-03-21 Procede et dispositif de commande de l'actionneur piezoelectrique de la soupape de distribution piezoelectrique d'une unite de pompe d'injection

Country Status (3)

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EP (1) EP1488089B1 (fr)
DE (1) DE50301997D1 (fr)
WO (1) WO2003083278A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004062073B4 (de) * 2004-12-23 2015-08-13 Continental Automotive Gmbh Verfahren und Vorrichtung zur Kompensation von Prelleffekten in einem piezogesteuerten Einspritzsystem einer Verbrennungskraftmaschine
DE102005040530B3 (de) * 2005-08-26 2006-12-21 Siemens Ag Verfahren und Vorrichtung zum Ansteuern eines Ventils
DE102005046933B4 (de) * 2005-09-30 2015-10-15 Continental Automotive Gmbh Verfahren zum Ansteuern eines piezobetätigten Einspritzventils
DE102010040306B4 (de) 2010-09-07 2020-06-25 Continental Automotive Gmbh Verfahren zur Ansteuerung eines Piezoinjektors eines Kraftstoffeinspritzsystems
DE102013224385B3 (de) 2013-11-28 2015-03-12 Continental Automotive Gmbh Verfahren zum Betreiben eines Injektors eines Einspritzsystems einer Brennkraftmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE68921047T2 (de) * 1988-11-30 1995-06-14 Toyota Motor Co Ltd Apparat zum Antreiben eines piezoelektrischen Elements zum Öffnen oder zum Schliessen eines Ventilteils.
DE19921456A1 (de) * 1999-05-08 2000-11-16 Bosch Gmbh Robert Verfahren und Vorrichtung zur Ansteuerung eines piezoelektrischen Aktors

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DE50301997D1 (de) 2006-01-26
WO2003083278A1 (fr) 2003-10-09
EP1488089A1 (fr) 2004-12-22

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