EP1418328A2 - Vorrichtung und Verfahren zum Steuern des Aktors eines Ventils - Google Patents
Vorrichtung und Verfahren zum Steuern des Aktors eines Ventils Download PDFInfo
- Publication number
- EP1418328A2 EP1418328A2 EP03104122A EP03104122A EP1418328A2 EP 1418328 A2 EP1418328 A2 EP 1418328A2 EP 03104122 A EP03104122 A EP 03104122A EP 03104122 A EP03104122 A EP 03104122A EP 1418328 A2 EP1418328 A2 EP 1418328A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator
- control signal
- charging
- grp
- valve
- 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- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims description 39
- 239000013256 coordination polymer Substances 0.000 claims abstract description 29
- 238000007599 discharging Methods 0.000 claims abstract description 23
- 238000002485 combustion reaction Methods 0.000 claims abstract description 11
- 238000002347 injection Methods 0.000 claims description 27
- 239000007924 injection Substances 0.000 claims description 27
- 230000008569 process Effects 0.000 claims description 24
- 230000006399 behavior Effects 0.000 claims description 13
- 230000001960 triggered effect Effects 0.000 claims description 3
- 230000002123 temporal effect Effects 0.000 claims 2
- 239000000446 fuel Substances 0.000 abstract description 2
- 238000004804 winding Methods 0.000 description 10
- 239000012530 fluid Substances 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000007306 turnover 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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2031—Control of the current by means of delays or monostable multivibrators
-
- 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
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2037—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit for preventing bouncing of the valve needle
-
- 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
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2051—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using voltage control
Definitions
- the invention relates to an apparatus and a method for Controlling an actuator of a valve, in particular a piezoelectric Actuator of an injection valve for an internal combustion engine, according to the preamble of claim 1.
- the desired stroke is one from DE 199 44 733 A1 Driver circuit with a transformer known, the Primary side of the transformer with a charging switch a supply voltage is connected while the secondary side via a discharge switch with the piezoelectric Actuator is connected.
- a suitable pulse width modulated Activation of the charge switch and the discharge switch then the state of charge of the piezoelectric actuator according to the desired stroke so that the injector either opens at the specified times or closes.
- the invention is therefore based on the object in piezoelectric Injectors noise emissions, vibrations and reduce wear.
- the task is accomplished by a control method for a piezoelectric Actuator according to claim 1 and a device according to Claim 8 solved.
- the invention is based on physical knowledge, that the noise, vibrations and wear in the case of piezoelectric actuators essentially through fluid dynamic Cause phenomena that arise if the injector quickly between the open valve position and the closed valve position changes. Accordingly, the invention sees a predetermined time Opening and / or closing behavior of the injection valve before, to suppress the disturbing fluid dynamic phenomena.
- the actuator is therefore used in the control method according to the invention to determine a predetermined opening time and / or closing behavior of the valve when charging and / or when unloading successively to at least three different ones Charge states loaded, with at least one of the charge states a partially open and partially closed Valve corresponds.
- a partially open and partially closed Valve corresponds.
- the partially open intermediate position of the injector carries advantageous to calm the aforementioned fluid dynamic phenomena, because the injector opens or closes less abruptly.
- the time course of the first control signal and / or the second control signal to determine a specific time Opening and / or closing behavior is in the form of a Sequence saved.
- the saved sequence is defined in this case a certain time course of the valve position of the injection valve when opening or closing.
- the flow-dynamically optimal course can then under laboratory conditions can be determined and saved so that in normal Operation only a recall of the saved sequence is required.
- each a time opening or Define the closing behavior of the injection valve Corresponding the operating conditions of the injection system can then the optimal sequence can be read and processed.
- the Switch between the saved sequences or the selection a saved sequence can be, for example, by a digital selection signal.
- the waiting time being smaller or greater than the previous charging or discharging time can.
- the charging time is the time span in which the actuator charging while the discharge time is the period in which the actuator is discharged.
- This retention of Charge status during the waiting times is advantageous because the injector thus maintains its valve position during the waiting period essentially maintains a reassurance fluid dynamic effects that occur during the sudden The injection valve opens or closes.
- the Length of waiting time can be optimized to the disturbing to suppress flow dynamic phenomena and an opti Male opening and closing behavior of the injection valve to reach.
- the Actuator in the closed state of the injection valve one after the other partially unloaded several times and then again partially charged so that the valve position of the injector oscillates around the closed position, whereby the Injector opened several times briefly and slightly becomes.
- the Actuator for specifying a predetermined opening and / or time Closing behavior of the valve for specified Charging times charged and / or for predetermined discharge times unloaded and for predetermined waiting times on an in kept essentially constant state of charge.
- the definition the predetermined charge states are therefore carried out here indirectly by specifying the loading times, the unloading times and the waiting times in between. According to the respective The loading and unloading times are then the desired ones Charge states.
- the change between the loading times is preferred Discharge times and waiting times by a first control signal triggered.
- the first control signal is preferably by a pulse train, preferably in each case a pulse edge starts a charging or discharging time.
- a pulse edge starts a charging or discharging time.
- a falling edge of the first control signal triggers a charging process
- an increasing one Edge of the first control signal triggers a discharge process.
- an increasing Edge of the first control signal triggers a charging process
- a falling edge triggers an unloading process.
- a second control signal is preferably provided, this is the duration of the loading and unloading processes specifies, this second control signal preferably level active is.
- this second control signal preferably level active is.
- a high level of the second Control signal end a charging or discharging process. It is however, conversely, it is also possible that a low level of the second Control signal ended a charging or discharging process.
- the second control signal can be used as an enable signal serve by triggering a charging or discharging process releases depending on its level or locks.
- the second control signal at a High level triggers a charging or discharging process block even on an edge of the first control signal. It it is also possible, conversely, that a low level of the second control signal the triggering of a charging or discharging process locks on an edge of the first control signal. This blocking of a loading or unloading process enables an inactive level change of the first control signal in order Trigger two charging processes or two unloading processes one after the other to be able to.
- ASIC digital application specific integrated circuit
- control method according to the invention is particularly advantageously suitable for pump-nozzle injection systems, but the invention can also be implemented with common rail injection systems. Moreover, the invention is also applicable to a gasoline direct injection - applicable (HPDI H igh P ressure D irect I njection).
- the driver circuit shown in Figure 1 is used for electrical Control of piezoelectric actuators of injection valves an internal combustion engine. To simplify it here only a single actuator CP is shown, although with one multi-cylinder internal combustion engine according to the number There are several actuators in combustion chambers.
- the Actuators, not shown, are constructed identically and connected in parallel to the actuator CP, as shown by the dashed line Lines is indicated.
- the actuator CP is - like the other actuators not shown for the other combustion chambers of the internal combustion engine - in Series connected with a selector switch 1 and a resistor R1, the selector switch 1 from a parallel connection consists of a switching element S1 and a diode D1.
- the selector switch 1 enables one of the actuators for a loading or unloading process by the switches S1 switches while the corresponding ones Disconnect switches for the other actuators.
- the actuator CP is charged or discharged via a charging and discharging circuit 6.
- V CC 12 V by the motor vehicle electrical system.
- the invention can also be used in a motor vehicle electrical system with a mains voltage of 42 V.
- the primary winding W1 of the transformer 3 is in series with a resistor R2 and a parallel connection of a diode D2 and a charging switch S2 switched.
- the charging switch S2 To charge the Actuator is the charging switch S2 with a predetermined frequency and predetermined pulse duty factor with a given number of pulse width modulated signals the specified charging voltage.
- the current rises the primary coil W1 on and at a predetermined time by opening (non-conducting control) the charging switch S2 canceled.
- the secondary winding W2 of the transformer 3 is in contrast Series with a resistor R3 and a parallel connection a diode D3 and a switch S3 switched.
- the actuator CP is also discharged with pulse width modulated Signals that the discharge switch S3 is pulsed conductive and non-conductive controlled, whereby the actuator voltage drops.
- the current flows from the actuator CP via the secondary winding W2, the discharge switch S3 and the selector switch 1 back to the actuator CP.
- control unit 4 which is shown here only schematically.
- control unit 4 takes into account the charging current Discharge current, the actuator current, the actuator voltage and the primary voltage.
- the control unit 4 therefore points several measurement inputs with the voltage-side connections of the resistors R1, R2 or R3 as well as with the voltage side Connections of the primary winding W1 or the secondary winding W2 are connected.
- the control unit 4 can be, for example, a microprocessor 9 can be controlled, for simplification only the interface 5, via which the control data of the microprocessor 9 are transmitted, shown as block arrow 5 is.
- the control data supplied by the microprocessor 9 can, for example, the selection of the respective actuator determine.
- the control unit 4 can also measured values of the discharge current, the actuator current, the actuator voltage and the primary-side voltage to the microprocessor 9 report back.
- the time course of the opening and closing behavior of the is controlled by the actuator CP by specifies two control signals GRP and GRP_ENA, one being typical timing of the control signals GRP and GRP_ENA is shown in Figure 2.
- Figure 2 also shows a curve 6, which corresponds to the valve position of the actuator CP the control signals GRP and GRP_ENA controlled injection valve reproduces.
- the fully open valve position (“OPEN”) and the fully closed valve position (“CLOSED”) of the injection valve are in each case by horizontal dashed lines are shown.
- the second control signal GRP_ENA is a sequence in one Memory 7 stored and is from the control unit 4 read this.
- the memory 7 can both within the Control unit 4 as well as in whole or in part within one application-specific module 8 a so-called ASIC (Application Specific Integrated Circuit).
- the microprocessor Depending on the input variables - such as information about the operating state of an internal combustion engine such as Speed, temperature, fuel pressure etc. - is done by the microprocessor a specification for the amplitude of the charging and / or discharging current calculated. This requirement is in turn over the Interface 5 transmitted to the control unit 4, the corresponding this specification and by the control signals GRP and GRP_ENA specified sequence charges or discharges the actuator CP.
- control unit 4 the interface 5 and the memory 7 are here in an application-specific module 8 So-called ASIC (Application Specific Integrated Circuit) summarized.
- ASIC Application Specific Integrated Circuit
- the control signal GRP triggers a charging time with its edges or a discharge time, with a falling edge of the control signal GRP starts a charging time, whereas a rising edge of the control signal GRP_ENA a discharge time triggers.
- the control signal GRP_ENA is level active, whereby a High level of the control signal GRP_ENA a charging or discharging time ended and thereby initiates a waiting period until the next edge of the control signal GRP another charge or Discharges.
- the control signal GRP_ENA also enables one inactive edge of the control signal GRP by triggering a charge or discharge time when the control signal is high GRP_ENA is blocked. This way you can consecutively multiple loading times are started, each are separated from each other by a waiting period.
- control of the charging and discharging of the actuator CP by the both control signals GRP and GRP_ENA is also by the Flow chart illustrated in Figure 3, to the following reference taken.
- a falling edge of the control signal GRP leads to a charging of the actuator CP, whereas an increasing Edge of the control signal GRP discharges the actuator CP initiates.
- an edge of the control signal GRP only has then an impact if this is at or just before a low level of the control signal GRP ENA occurs. This is important, otherwise an unloading process will follow each charging process would.
- GRP_ENA enables several successive ones Charging processes caused by a waiting time with a constant state of charge of the actuator CP are separated.
- control signals GRP and GRP_ENA can be a desired opening time Closing behavior of the injection valve controlled by the actuator CP to reach.
- curve 6 shows the valve position in Figure 2 next to a fully closed valve position CLOSED and a fully open valve position ON several intermediate positions 7-9, in which the injector partially open and partially closed is.
- this allows a reduction in opening or closing the injector associated noise emissions and vibrations, for example because it prevents cavitation becomes.
- the injection process itself can be taken into account optimized for reducing consumption and reducing pollutants become.
- Figure 4 shows an alternative embodiment of a Driver circuit partially with that described above and the embodiment shown in FIG. 1 corresponds. To avoid repetition is therefore largely referred to the above description, wherein for matching components used the same reference numerals to be differentiated only by an apostrophe Marked are.
- a special feature of this driver circuit is that the transformer 3 in Figure 1 by a single inductor L is replaced.
- control of the charge switch S2 'and the discharge switch S3 ' takes place in the manner described above, the control signals GRP and GRP_ENA the duration of the charging and define unloading processes and thus the time Determine the opening and closing behavior of the injection valve.
- the control method according to the invention is also at the driver circuit according to FIG. 4 can be used.
- the voltage-side connection of the diode D4 can also be used the connection point between the resistor R2 'and the charging switch S2 'to be connected, being the direct connection the diode D4 is separated by the voltage converter 2 '.
- ground connection of the diode D3 'with the connection point between the discharge switch S3 'and the Resistor R3 ' may be connected, being the direct ground connection the diode D3 'is separated.
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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)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
- Figur 1
- ein Schaltbild einer Treiberschaltung zur elektrischen Ansteuerung eines Piezoaktors,
- Figur 2
- den zeitlichen Verlauf von Steuersignalen für die in Figur 1 gezeigte Treiberschaltung sowie die zugehörige Stellung eines Einspritzventils,
- Figur 3
- das erfindungsgemäße Steuerverfahren als Flussdiagramm sowie
- Figur 4
- ein alternatives Ausführungsbeispiel einer Treiberschaltung zur elektrischen Ansteuerung eines Piezoaktors
Claims (10)
- Verfahren zum Steuern eines Aktors (CP) eines Ventils, insbesondere eines piezoelektrischen Aktors eines Einspritzventils für eine Brennkraftmaschine, wobei der Aktor (CP) nacheinander auf zwei Ladungszustände (AUF, ZU) geladen wird, die jeweils einer Stellung des Ventils entsprechen,wobei der Aktor (CP) zur Festlegung eines vorgegebenen zeitlichen Öffnungs- und/oder Schließverhaltens des Ventils beim Aufladen und/oder beim Entladen nacheinander auf mindestens drei unterschiedliche Ladungszustände (AUF, 7-9, ZU) geladen wird, wobei mindestens einer der Ladungszustände (7-9) einem teilweise geöffneten und teilweise geschlossen Ventil entspricht,wobei der Aktor (CP) zur Festlegung eines vorgegebenen zeitlichen Öffnungs- und/oder Schließverhaltens des Ventils jeweils für vorgegebene Ladezeiten aufgeladen und/oder für vorgegebene Entladezeiten entladen sowie für vorgegebene Wartezeiten auf einem im Wesentlichen konstanten Ladungszustand gehalten wird,wobei die Ladezeiten und/oder die Entladezeiten durch ein erstes Steuersignal (GRP) ausgelöst werden,wobei die Ladezeiten und/oder die Entladezeiten durch ein zweites Steuersignal (GRP_ENA) beendet werden, undwobei der zeitliche Verlauf des ersten Steuersignals (GRP) und/oder des zweiten Steuersignals (GRP_ENA) zur Festlegung eines bestimmten zeitlichen Öffnungs- und/oder Schließverhaltens des Ventils in Form einer Sequenz aus einem Speicher (7) ausgelesen werden.
- Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass die verschiedenen Ladungszustände (AUF, 7-9, ZU) jeweils für eine vorgegebene Wartezeit beibehalten werden. - Verfahren nach Anspruch 1 oder Anspruch 2,
dadurch gekennzeichnet, dass die Wartezeit kleiner oder größer als die Entladezeit und/oder die Ladezeit ist. - Steuerverfahren nach einem der Ansprüche 1 - 3,
dadurch gekennzeichnet, dass die Ladezeiten und/oder die Entladezeiten jeweils durch eine Flanke des ersten Steuersignals (GRP) ausgelöst werden. - Verfahren nach einem der Ansprüche 1 - 4,
dadurch gekennzeichnet, dass bei einer Flanke des ersten Steuersignals (GRP) eine Ladezeit gestartet wird, während bei einer entgegengesetzten Flanke des ersten Steuersignals (GRP) eine Entladezeit gestartet wird. - Verfahren nach einem der Ansprüche 1 - 5,
dadurch gekennzeichnet, dass mehrere Sequenzen gespeichert sind, die jeweils ein anderes zeitliches Öffnungs- und/oder Schließverhaltens des Ventils definieren, wobei die Auswahl einer gespeicherten Sequenzen durch ein drittes Steuersignal erfolgt. - Verfahren nach mindestens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass zur Erzeugung und/oder Speicherung des ersten Steuersignals und/oder des zweiten Steuersignals und/oder des Steuersignals ein Mikroprozessor (9) vorgesehen ist. - Vorrichtung zum Steuern eines Aktors (CP) eines Ventils, insbesondere eines piezoelektrischen Aktors eines Einspritzventils für eine Brennkraftmaschine, die aufweist:einen Auswahlschalter (1) zur Auswahl eines Aktors (CP) für einen Lade- oder Entladevorgang,einen Spannungswandler (2), der eingangsseitig mit einem Bordnetz und ausgangsseitig über eine Lade- und Entladeein heit (6) mit dem Aktor (CP) verbunden ist,einen Speicher (7) und eine Steuereinheit (4), die eine Schnittstelle (5) zu einer Mikroprozessor (9) und eine Schnittstelle zu dem Speicher (7) aufweist, undin diesem Speicher (7) Daten (GRP_ENA) gespeichert sind, die den zeitlichen Öffnungs- und/oder Schließverlauf des Aktors (CP) vorgeben.
- Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass der Speicher (7) der Speicher eines Mikroprozessors (9) ist.
- Anwendungsspezifischer integrierter Schaltkreis (8), der die Steuereinheit (4), die Schnittstelle (5) und den Speicher (7) nach Anspruch 8 aufweist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10252092 | 2002-11-08 | ||
DE10252092 | 2002-11-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1418328A2 true EP1418328A2 (de) | 2004-05-12 |
EP1418328A3 EP1418328A3 (de) | 2008-12-24 |
Family
ID=32103412
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03104122A Withdrawn EP1418328A3 (de) | 2002-11-08 | 2003-11-07 | Vorrichtung und Verfahren zum Steuern des Aktors eines Ventils |
Country Status (1)
Country | Link |
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EP (1) | EP1418328A3 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005121534A1 (de) * | 2004-06-11 | 2005-12-22 | Siemens Aktiengesellschaft | Steuergerät für piezo-aktoren von kraftstoff-einspritzventilen |
EP1628010A2 (de) * | 2004-08-18 | 2006-02-22 | Siemens Aktiengesellschaft | Verfahren und Schaltungsanordnung zum Betrieb eines Piezoaktors |
WO2006061113A1 (de) * | 2004-12-08 | 2006-06-15 | Siemens Ag | Verfahren zum steuern eines piezoelektrischen aktors und steuereinheit zum steuern eines piezoelektrischen aktors |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19921456A1 (de) * | 1999-05-08 | 2000-11-16 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Ansteuerung eines piezoelektrischen Aktors |
-
2003
- 2003-11-07 EP EP03104122A patent/EP1418328A3/de not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19921456A1 (de) * | 1999-05-08 | 2000-11-16 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Ansteuerung eines piezoelektrischen Aktors |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005121534A1 (de) * | 2004-06-11 | 2005-12-22 | Siemens Aktiengesellschaft | Steuergerät für piezo-aktoren von kraftstoff-einspritzventilen |
US7455051B2 (en) | 2004-06-11 | 2008-11-25 | Siemens Aktiengesellschaft | Control device for piezo actuators of fuel injection valves |
EP1628010A2 (de) * | 2004-08-18 | 2006-02-22 | Siemens Aktiengesellschaft | Verfahren und Schaltungsanordnung zum Betrieb eines Piezoaktors |
EP1628010A3 (de) * | 2004-08-18 | 2006-09-06 | Siemens Aktiengesellschaft | Verfahren und Schaltungsanordnung zum Betrieb eines Piezoaktors |
WO2006061113A1 (de) * | 2004-12-08 | 2006-06-15 | Siemens Ag | Verfahren zum steuern eines piezoelektrischen aktors und steuereinheit zum steuern eines piezoelektrischen aktors |
US7617813B2 (en) | 2004-12-08 | 2009-11-17 | Siemens Aktiengesellschaft | Method for controlling a piezoelectric actuator and control unit for controlling a piezoelectric actuator |
Also Published As
Publication number | Publication date |
---|---|
EP1418328A3 (de) | 2008-12-24 |
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