EP1825124A1 - Procede pour commander un actionneur piezoelectrique, et unite de commande pour commander un actionneur piezoelectrique - Google Patents

Procede pour commander un actionneur piezoelectrique, et unite de commande pour commander un actionneur piezoelectrique

Info

Publication number
EP1825124A1
EP1825124A1 EP05810154A EP05810154A EP1825124A1 EP 1825124 A1 EP1825124 A1 EP 1825124A1 EP 05810154 A EP05810154 A EP 05810154A EP 05810154 A EP05810154 A EP 05810154A EP 1825124 A1 EP1825124 A1 EP 1825124A1
Authority
EP
European Patent Office
Prior art keywords
actuator
voltage
control
teilhubspannung
injection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05810154A
Other languages
German (de)
English (en)
Other versions
EP1825124B1 (fr
Inventor
Hans-Jörg Wiehoff
Harald Schmidt
Richard Pirkl
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 EP1825124A1 publication Critical patent/EP1825124A1/fr
Application granted granted Critical
Publication of EP1825124B1 publication Critical patent/EP1825124B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • F02D2041/2024—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
    • 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
    • F02D2041/2034—Control of the current gradient
    • 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
    • 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
    • F02D2041/2055—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit with means for determining actual opening or closing time
    • 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
    • F02D41/008—Controlling each cylinder individually

Definitions

  • the invention relates to a method for controlling a piezoelectric actuator according to claim 1 and a control unit for controlling a piezoelectric actuator according to claim 10.
  • Piezoelectric actuators are used in a wide variety of technical fields to control an actuator.
  • piezoelectric actuators are suitable for driving a switching valve of a pump-nozzle unit of a fuel injection system.
  • Piezoelectric actuators are very fast to switch, so that the injection processes of the pump-nozzle unit can be precisely controlled.
  • Modern pump-injector units with which, for example, diesel is injected into an internal combustion engine of a motor vehicle, use high fuel pressures of up to 2000 bar.
  • the demands on the exhaust quality are increasing more and more, so that a very precise adjustment of the injected fuel quantity and equality in the injection quantity of different cylinders of an internal combustion engine is required.
  • the precise injection operations during the entire life of the pump-nozzle unit are to be maintained even with appropriate aging phenomena.
  • occurring Tolleranzen should be compensated in the pump-nozzle units.
  • the hydraulic delivery end of the pump-nozzle unit which can be derived from the opening behavior of the piezoelectric actuator, to determine as accurately as possible. Knowing the timing of the hydraulic delivery end of the pump-nozzle unit is to ensure the micro-dimensional stability due to higher injection sensitivity during charging of the piezoelectric actuator and its hysteresis required. Also for a cylinder-specific correction, knowing the time of the hydraulic delivery end of the pump-nozzle unit is required.
  • the opening behavior of the injection valve is determined from the voltage of the piezoelectric actuator.
  • various control methods are known.
  • the object of the invention is to provide an improved method for controlling a piezoelectric actuator and an improved control unit for controlling a piezoelectric actuator.
  • An advantage of the method according to the invention is that a parameter dependent on the partial stroke voltage is used as the control variable, and that a desired value for the controlled variable with which the method for controlling the piezoelectric actuator is carried out is determined.
  • the gradient of the voltage during the discharge time is used as the control variable. In this way, an individual adaptation of the tax procedure is made possible.
  • a range of values is used as the desired value for the partial lift voltage.
  • a value range for the Generalhubschreib is a precise control of the actuator, in particular a Control of a switching needle of an injection valve, in particular a pump-nozzle unit or a common-rail injection valve given.
  • a maximum voltage value for the partial lift voltage is used as desired value. Experiments have shown that the use of a maximum voltage value for the Generalhubschreib a relatively precise and efficient control of the control method is given.
  • the partial stroke voltage is used as the controlled variable and the gradient of the partial stroke voltage as the desired value. This provides a further improvement of the tax procedure.
  • the method described is particularly suitable when used in a common rail injection valve or a pump-nozzle unit of a fuel injection system.
  • the voltage values of the actuator are detected during a test activation of the actuator, in which no injection takes place, but only measured values are determined.
  • the injection operation is not affected by the detection of the measured values.
  • the partial lift voltage is used as the parameter, and a frequency of the partial lift voltage is specified as the setpoint.
  • a frequency of the partial lift voltage is specified as the setpoint.
  • FIG. 2 shows a schematic diagram for illustrating an injection sequence with pre-injection and main injection
  • FIG. 3 shows a detailed illustration of a control valve opening phase of a pump-nozzle unit
  • FIG. 4 shows a detailed illustration of the voltage profile during a tripping-holding phase
  • Figure 5 shows the relaxation curve of the piezoelectric actuator during Generalhubschreib
  • Figure 6 is a simply constructed drive circuit for the piezoelectric actuator.
  • the invention is described using the example of a pump-nozzle unit, but can be used with any type of injection valve, in particular in the case of a common-rail injection valve.
  • FIG. 1 shows a schematic representation of an arrangement with a pump-nozzle unit 2, which is connected to a Messan- order 6 and a control unit 5.
  • the pump-nozzle unit 2 represents an injection valve, for example, for an internal combustion engine of a motor vehicle whose injection processes are controlled by means of a piezoelectric actuator 1.
  • the piezoelectric actuator 1 controls in the illustrated embodiment, a control valve 3, which controls a position of a nozzle needle of the pump-nozzle unit 2 via a hydraulic connection. Depending on the position of the control valve 3, the nozzle needle is lifted from a sealing seat and triggered an injection.
  • the basic structure of the pump-nozzle unit 2 is known and is not explained in detail in the present application.
  • the control valve 3 has a sealing surface 13 which is associated with a sealing seat 14.
  • the sealing surface 13 is formed on an end surface of a control valve needle 17 of the control valve 13.
  • the sealing seat 14 is arranged in a ring around an inlet opening of an inlet 15.
  • the inlet 15 is in communication with a fuel reservoir.
  • the pump-nozzle unit points an injection nozzle 10 with a pressure chamber 25, in which a nozzle needle 24 is arranged.
  • the injection nozzle 10 has injection holes 18, is discharged via the fuel from the pressure chamber 25 in the injection process.
  • the inlet 15 opens via the inlet opening into a connecting line 16, which is connected to a pump chamber of a pump and the pressure chamber 25 of the pump-nozzle unit.
  • the nozzle needle 24 is arranged with pressure surfaces. Depending on the pressure in the pressure chamber 25, the nozzle needle 24 is lifted by an associated needle sealing seat 26 and the injection takes place.
  • the piezoelectric actuator 1 is connected via electrical lines 4 to a charging unit 7.
  • the charging unit 7 is connected via a control line 8 with the control unit 5 in connection Rankg.
  • the control unit 5 is also connected to a data memory 11.
  • the measuring arrangement 6 is connected to the electrical lines 4 via first measuring lines 12.
  • the measuring arrangement 6 is also connected to the control unit 5 via a second measuring line 9.
  • the control unit 5 controls the charging unit 7 in such a way that the piezoelectric actuator 1 controls the control valve 3 in the desired manner, so that the nozzle needle 24 lifts off from the needle sealing seat 26 at predetermined times and delivers fuel from the pressure chamber 25 via the injection holes 18.
  • the control of the delivery end ie the closing of the injection holes is of particular importance for the quality of the injection.
  • fixed control methods are stored in the data memory 11, according to which the control unit 5 controls the loading unit 7 in order to achieve defined partial strokes of the actuator 1, in particular during the control of the delivery end.
  • the voltage applied to the piezoelectric actuator 1 is detected via the measuring arrangement 6 via the electrical lines 4 and reported to the control unit 5 via the second measuring line 9.
  • the control unit 5 the control of the charging unit 7, in order to achieve the desired voltage curve at the actuator 1.
  • the voltage curve at the actuator 1 determines the partial strokes of the piezoelectric actuator, in particular at the delivery end, and thus the injection characteristics of the pump-nozzle unit 2.
  • FIG. 2 shows a diagram for a typical injection curve of an injection valve, in particular a pump-nozzle unit 2 with a pilot injection and a main injection.
  • the piezo voltage i. H. applied to the piezoelectric actuator 1 voltage applied over time or the crankshaft angle.
  • the piezoelectric voltage is detected by the measuring arrangement 6 via the electrical lines 4.
  • T 1 the pilot injection and in a subsequent second period T 2
  • the main injection is shown.
  • the piezoelectric voltage is first increased to a first voltage value U 1 and then after a short drop to a second voltage value U 2, which is greater than the first voltage value U 1.
  • the second voltage value U 2 represents a starting voltage.
  • the voltage is lowered from the second voltage value U 2 to a third voltage value U 3 and, after a brief increase in the voltage, finally lowered to a fourth voltage value U 4 which is less than the third voltage value is U 3.
  • the voltage between the third and fourth voltage value U 3, U 4 represents a partial lift voltage. Due to the different voltage values, partial strokes of the piezoelectric actuator 1 are set.
  • the position of the control valve needle 17 is plotted over the time or the crankshaft angle under the piezo voltage.
  • the position of the control valve needle 17 depends on the piezo voltage.
  • the Operahubschreiben partial strokes of the control valve needle 17 are specified.
  • the Operahubschreib is proportional to a needle stroke or a position of the control valve needle 17 of the control valve. 3
  • the Molhubschreib can be used as a control variable for the regulations of partial strokes of the control needle 17, in particular at the end of the injection.
  • the position of the nozzle needle 24 is plotted over the time or the crankshaft angle.
  • the position of the control valve needle 17 reaches the maximum deflection at a time TS, which corresponds to an application of the control valve needle 17 with the sealing surface 13 on the sealing seat 14. At this time, the inlet 15 is closed.
  • the control valve needle 17 begins to lift off the sealing seat 14 again at the time TE. Due to the inertia of the system, the nozzle needle 24 reaches its maximum opening stroke at a later point in time TN, and then settles again on the needle sealing seat 26 at a point in time TP. Due to the inertia of the system, accurate control of the injection requires that the control valve needle 17 be in
  • Partial strokes is controlled to precisely control the nozzle needle 24. This is especially necessary when finishing the scoring, i. when placing the nozzle needle 24 on the Nadeldichtsitz 26th
  • a drive of the piezoelectric actuator 1 is performed, which corresponds to a main injection.
  • the essential difference between the pilot injection and the main injection is that the time duration in which the second voltage U 2 is applied to the piezoelectric actuator 1, longer than in the pilot injection is.
  • the nozzle needle is lifted longer from the sealing seat and it is injected more fuel.
  • the piezoelectric actuator Due to the inertia of the system, precise actuation of the piezoelectric actuator is required to set a precise amount of fuel delivered by the pump-nozzle unit 2.
  • the hydraulic delivery end of the pump-nozzle unit which can be derived from the opening behavior of the control valve 3, lent possible to determine precisely.
  • the hydraulic delivery end is required due to the higher injection sensitivity during the discharging process of the piezoelectric actuator 1, which in the illustrated embodiment corresponds to an opening of the control valve 3 and thus an ending of the injection process, and due to the hysteresis behavior of the piezoelectric actuator Precise control of the unit injector unit.
  • the delivery end is determined by the discharging operation of the actuator, so that the discharging process can be controlled precisely over partial strokes of the voltage.
  • a cylinder-individual control of the delivery end of the pump-nozzle unit is provided when in an internal combustion engine a plurality of pump-nozzle units are provided for each cylinder.
  • the charging of the actuator can be controlled in partial strokes, if it is a control valve 3, which is closed in the de-energized state of the actuator 1 and the injection of the actuator 1, the injection is terminated.
  • the delivery end of the pump-nozzle unit 1 is characterized in that increases after the lifting of the control valve needle 17 of the associated sealing seat of the opening cross-section of the control valve 3, so that a pressure reduction phase in the fuel system of the pump-nozzle unit 3 can be set.
  • the opening phase of the control valve 3 largely determines the minimum quantity stability.
  • the opening phase of the control valve relates to the time range in which the voltage at the piezoelectric actuator 1 is lowered from the second voltage U 2 via the third voltage U 3 to the fourth voltage U 4.
  • the movement of the control valve needle 17 is essentially determined by the discharge gradient, i. H. the voltage change on the piezoelectric actuator 1, determined by the applied valve sealing force, by the 'effect of the return spring of the control valve needle 17, not shown, and by the resulting pressure pulse.
  • the course of motion of the control valve needle 17 can be described by a higher-order parabola function.
  • Figure 3 shows an enlarged view of the piezoelectric voltage U, the valve needle path V of the control valve needle 17 and the pressure curve P of the fuel in the pressure chamber 25 at the opening phase of the control valve 3, ie at the initiation of the injection end, ie the delivery end of the pump-nozzle unit. 2
  • the characteristic curves are over time or the crank applied wave angle. From a third time T 3, a discharge of the piezoelectric actuator 1 is carried out by the charging unit 7 in accordance with the control by the control unit 5, so that the voltage U drops from the second voltage value U 2 to the third voltage value U 3 via a discharge gradient.
  • the control valve needle 17 follows offset in time and lifts only at a fourth time T 4 from the sealing seat 14 ' : Due to the inertia of the system reaches the fuel pressure P in the pressure chamber 25 at a fifth time T 5, the maximum pressure value, after the fourth Time T 4 is.
  • the third voltage value U 3 is reached at a sixth time T 6.
  • a holding phase follows, which lasts up to a seventh time T 7, in which the charging unit 7 does not further influence the voltage at the piezoelectric actuator 1. Due to the piezoelectric effect increases in the holding phase between the sixth time and the seventh time T 6, T 7, the partial voltage slightly.
  • the voltage at the piezoelectric actuator 1 is referred to as Diagramhubschreib during the holding phase.
  • the Railhubschreib, in particular the gradient of Operahubschreib is proportional to the stroke of the control valve needle 17. Therefore, the Ambihubschreib can be used as a control parameter to control a partial stroke of the control valve needle 17. From the seventh point in time T 7, the charging unit 7 lowers the electrical voltage at the piezoelectric actuator 1 by a discharging process up to the fourth voltage value U 4, which in the illustrated embodiment corresponds to the value 0 volts.
  • FIG. 4 shows a section of the piezo voltage between the third time T 3 and the seventh time T 7.
  • the control method preferably uses the gradient course of the partial lift voltage between the sixth time point T 6 and the seventh time point T 7 during the holding phase individually as a controlled variable for each unit injector 2 of an internal combustion engine having a plurality of unit injectors.
  • the corresponding control programs with which the individual gradient curve of the partial stroke voltage of the piezoelectric actuator of the pump-nozzle unit 2 is achieved are stored in the data memory 11.
  • the control unit 5 accesses the corresponding control programs and controls in a corresponding manner the charging unit 7, which performs a corresponding discharge of the piezoelectric actuator 1.
  • the voltage applied to the piezoelectric actuator 1 and the gradient of the partial lift voltage are detected by the measuring arrangement 6 and forwarded to the control unit 5.
  • the control unit 5 compares the measured gradient of the partial lift voltage during the holding phase with a reference value stored for the pump-nozzle unit 2. In an internal combustion engine having a plurality of pump-nozzle units 2, an individual reference value is stored for each pump-nozzle unit. If the detected voltage gradient does not correspond to the stored voltage gradient, then a change in the control of the piezoelectric actuator is carried out in such a way that the actual voltage gradient of the partial stroke voltage at the actuator 1 is applied to the data memory 11 Approximates voltage gradients. In a simple embodiment, a maximum voltage value at the end of the holding phase is used as the control value for controlling the partial lift voltage.
  • the discharge time i. the time between the third and the sixth time T 3
  • T 6 held constant and the Entladegradient to reach the desired voltage at the sixth time T 6 changed.
  • FIG. 5 shows the partial stroke voltage U at the actuator 1 during the holding phase, the partial stroke voltage U having a vibration spectrum.
  • the frequency or the amplitude of the Molhubschreib is determined by the spring-mass characteristic of the control valve path in the pump-nozzle unit 2.
  • both the gradient of the Operahubschreib and the amplitude characteristic of Operahubschreib can be used as a controlled variable for the control of the pump-nozzle unit 2.
  • corresponding comparison amplitude profiles for the partial lift voltage are stored in the data memory 11 during the hold phase.
  • the measuring arrangement 6 detects the amplitude curve of the piezoelectric voltage during the holding phase and forwards it to the control unit 5.
  • the control unit 5 compares the detected amplitude curve of the
  • the charging unit 7 is driven accordingly in order to obtain an alignment of the actual amplitude curve of the piezoelectric voltage during the holding phase to the comparison amplitude curve.
  • the measured frequency is compared with a comparison frequency and the control of the charging unit unit 7 adapted in the manner in the next holding phase, that an approximation of the measured frequency takes place at the comparison frequency.
  • the correction of the opening time of the control valve or the delivery end of the pump-nozzle unit is preferably achieved by a corresponding adjustment of the discharge energy cylinder-specific and the resulting behavior of the track.
  • the resulting track behavior is characterized in that the movement of the control valve needle 17 is influenced by a fixed, electrical holding phase in such a way that it is reflected significantly in the voltage or also in the piezoelectric charge.
  • the discharge energy is now adjusted until a desired reference curve of the amplitude of the voltage or a reference gradient of
  • Adjusting voltage during the holding phase and thus reproducible and cylinder-specific opening behavior or the delivery end of the pump-nozzle unit can be controlled.
  • the measuring arrangement 6 detects the voltage applied to the piezoelectric actuator 1 during a standardization pulse in which the piezoelectric actuator 1 is driven in accordance with a conventional injection, but the camshaft does not actuate the pump of the pump-nozzle unit.- The detection of the voltage
  • the piezoelectric actuator 1 can also be performed during a normal delivery pulse.
  • the charging process of the piezoelectric actuator 1 can be controlled and / or regulated in an analogous manner in order to control partial strokes of the control valve needle 17 for an injection end.
  • Figure 6 shows a simple structure of the control of the piezoelectric actuator 1.
  • a reference gradient is provided as the setpoint value, which is connected to a first adding unit 20 is forwarded.
  • the first adding unit 20 is supplied with a gradient of the measured voltage of the piezoelectric actuator 1 via a second input.
  • the first adding unit 20 forms the difference between the nominal gradient of the data memory 11 and the measured gradient of the partial lifting voltage and forwards the difference to a first control block 21.
  • the first control block 21 determines from the difference value a control signal for the charging unit 7.
  • the control signal is forwarded from the first control block 21 to a second adding unit 22.
  • a desired control signal is supplied to a second control block 23.
  • the second control block 23 carries out a compensation with respect to the hysteresis behavior of the piezoelectric actuator 1 and outputs a corrected desired control signal to a second input of the second adder unit 22.
  • the second adder unit 22 adds the corrected target control signal to the control signal and forwards an end control signal to the charging unit 7 ,
  • the charging unit 7 determines from the Endêtsignal a piezoelectric voltage with which the piezoelectric actuator 1 is driven to starting from the second voltage U 2, a discharge of the actuator to the third voltage U 3 in the specified time from the third time T 3 to sixth time T 6 is discharged in order to obtain a Supplementhubschreib on the actuator 1 during the holding phase, which has a gradient according to the target gradient.
  • the voltage delivered by the charging unit 7 is detected and a voltage gradient is determined, which is forwarded to the first adding unit 20.
  • control valve needle of the pump-nozzle unit is analogously applicable to the control of a servo valve of a common-rail injection valve and analogously to the direct control of the nozzle needle of an injection valve the piezoelectric actuator controls the servo valve or the nozzle needle directly.
  • a servo valve is actuated with the piezoelectric actuator, which produces a
  • Control room connects to a drainage room.
  • the control chamber is connected to an inlet to the pressure accumulator of the common rail.
  • the nozzle needle is biased by the pressure in the control chamber to the associated sealing seat.
  • the nozzle needle adjoins the control chamber directly or via a pressure piston.
  • the pressure and area ratios are chosen so that when the servo valve is closed, the nozzle needle is pressed sealingly against the sealing seat by the pressure in the control chamber.
  • the pressure in the control chamber decreases because less fuel flows into the control chamber via the inlet than it drains into the drainage chamber via the outlet.
  • the pressure chamber is connected to the pressure accumulator of the common rail. Since the pressure in the pressure chamber does not drop, the nozzle needle is lifted from the fuel pressure in the pressure chamber by acting on the pressure surfaces of the sealing seat. This releases a connection between the pressure chamber and injection holes. Thus, fuel is discharged from the pressure space via the injection holes.
  • the injection begins. To end the injection, the servovalve is closed again by activating the piezoelectric actuator. This stops the outflow via the drain and the pressure in the control room increases again. From a specified pressure in the control chamber, the nozzle needle is pressed against the pressure in the pressure chamber back to the sealing seat and the injection is stopped.
  • a nozzle needle may also be actuated directly by a piezoelectric actuator become. This principle is particularly applicable to gasoline injectors.
  • the servo valve in a common-rail injection system is activated as the control valve, thereby improving the injection behavior of the injection valve.

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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

L'invention concerne un procédé pour commander un actionneur piézoélectrique qui déplace un organe de commande d'une soupape d'injection. Ce procédé consiste : à charger l'actionneur de sorte qu'il présente une tension de démarrage, puis ; à le décharger de sorte qu'il atteigne une tension de levée partielle, cette tension de levée partielle étant maintenue pendant un temps de maintien, et finalement ; à décharger l'actionneur de sorte qu'il présente une tension de repos, un paramètre qui dépend de la tension de levée partielle étant utilisé en tant que grandeur de commande. Une valeur théorique est déterminée pour la grandeur de commande, et l'actionneur est commandé de manière que la valeur théorique de la grandeur de commande soit respectée.
EP05810154A 2004-12-08 2005-11-25 Procede pour commander un actionneur piezoelectrique, et unite de commande pour commander un actionneur piezoelectrique Expired - Fee Related EP1825124B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004058971A DE102004058971B4 (de) 2004-12-08 2004-12-08 Verfahren zum Steuern eines piezoelektrischen Aktors und Steuereinheit zum Steuern eines piezoelektrischen Aktors
PCT/EP2005/012642 WO2006061113A1 (fr) 2004-12-08 2005-11-25 Procede pour commander un actionneur piezoelectrique, et unite de commande pour commander un actionneur piezoelectrique

Publications (2)

Publication Number Publication Date
EP1825124A1 true EP1825124A1 (fr) 2007-08-29
EP1825124B1 EP1825124B1 (fr) 2009-04-15

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Family Applications (1)

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EP05810154A Expired - Fee Related EP1825124B1 (fr) 2004-12-08 2005-11-25 Procede pour commander un actionneur piezoelectrique, et unite de commande pour commander un actionneur piezoelectrique

Country Status (4)

Country Link
US (1) US7617813B2 (fr)
EP (1) EP1825124B1 (fr)
DE (2) DE102004058971B4 (fr)
WO (1) WO2006061113A1 (fr)

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US20090223490A1 (en) 2009-09-10
EP1825124B1 (fr) 2009-04-15
DE502005007109D1 (de) 2009-05-28
DE102004058971B4 (de) 2006-12-28
WO2006061113A1 (fr) 2006-06-15
US7617813B2 (en) 2009-11-17
DE102004058971A1 (de) 2006-06-14

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