EP1718854B1 - Procede et dispositif pour determiner les flancs de charge d'un actionneur piezo-electrique - Google Patents

Procede et dispositif pour determiner les flancs de charge d'un actionneur piezo-electrique Download PDF

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Publication number
EP1718854B1
EP1718854B1 EP05701432A EP05701432A EP1718854B1 EP 1718854 B1 EP1718854 B1 EP 1718854B1 EP 05701432 A EP05701432 A EP 05701432A EP 05701432 A EP05701432 A EP 05701432A EP 1718854 B1 EP1718854 B1 EP 1718854B1
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EP
European Patent Office
Prior art keywords
voltage
actuator
threshold
charging
switch
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 - Fee Related
Application number
EP05701432A
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German (de)
English (en)
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EP1718854A1 (fr
Inventor
Wolfgang Stoecklein
Holger Rapp
Kai Sutter
Andreas Rau
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1718854A1 publication Critical patent/EP1718854A1/fr
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    • 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
    • F02D2041/2051—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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements

Definitions

  • the invention relates to a method and a device for determining the charging flank of a piezoelectric actuator of at least one injector, with which an amount of liquid is injected under high pressure into a cavity, in particular a combustion chamber of an internal combustion engine.
  • From the DE 100 32 022 A1 shows a method for determining the drive voltage for a piezoelectric actuator of an injection valve, in which before the next injection initially the pressure in a hydraulic coupler is measured indirectly.
  • the pressure is measured by the fact that the piezoelectric actuator is mechanically coupled to the hydraulic coupler, so that the pressure induces a corresponding voltage in the piezo-actuator.
  • This induced voltage is used before the next injection process to correct the drive voltage for the actuator.
  • injectors are used for example in common rail systems.
  • the pressure in the hydraulic coupler also depends on the rail pressure, so that the drive voltage is varied as a function of the rail pressure.
  • the voltage requirement of a piezoelectric actuator depends primarily on the pressure in the valve chamber and on the linear expansion of the piezoelectric actuator.
  • the voltage necessary for the proper operation of the injector at an operating point is the so-called voltage requirement, that is to say the relationship between voltage and stroke at a certain force, which is proportional to the rail pressure.
  • the derivation of the current voltage requirement of an injector from the voltage difference between maximum actuator voltage and stationary end voltage is for example from DE 103 15 815.4 known.
  • the charging edge It is also known to measure the charging edge to measure the voltage of the actuator shortly before the start of the discharge and regulate it to a desired value.
  • the manipulated variable used for this purpose is the so-called switch-off voltage, that is to say the voltage at which the charging process is terminated.
  • the duration of the charging edge is set to a predetermined nominal value of typically 100 microseconds.
  • a method for adjusting the charging voltage in which the voltage of a piezo stack is compared with a voltage stored in a sample-and-hold circuit, is compared by means of a comparison circuit.
  • a control circuit terminates a charge phase of the piezo stack.
  • the energy charged in the piezo stack can be made equal to the energy charged before the discharge. Even if the piezo stack is switched to a store when unloading, the energy of the piezo stack can be kept constant in this way.
  • the invention is based on the object to set the charging edge at each injector so that the influence of parameter tolerances, which influence the valve movement, can be kept as low as possible and in particular can be reduced compared to known from the prior art methods.
  • This object is achieved by a method and a device for determining the charging edge of a piezoelectric actuator of the type described above in that the difference between a cut-off voltage threshold and a stationary end voltage is detected and regulated to a predefinable setpoint.
  • the basic idea of the invention is accordingly to keep constant the difference between the switch-off voltage threshold, that is to say the voltage at which the charging process is terminated, and the stationary end voltage, that is to say the voltage of the actuator shortly before the discharge process starts.
  • the difference between the switch-off voltage threshold and the voltage of the actuator shortly before the start of the discharge process is a measure of the change in length of the actuator after the end of the charging edge and is thus again a measure of the way the switching valve after the end of the charging edge until it reaches its Must cover the stroke stop. If this difference is adjusted to a constant value, the switching valves of all injectors at the end of the loading flank have a uniform distance from their respective stroke stop.
  • the difference between the switch-off voltage threshold and the voltage of the actuator shortly before the start of the discharge by varying the switch-off threshold voltage to regulate the specifiable setpoint.
  • This embodiment is particularly suitable when the specification of the charging current can not be sufficiently finely quantized or given injector-individual. It is also advantageous that a variation of an already known and therefore not additionally detected size takes place.
  • the charging time is preferably adjusted to its desired value by varying the charging current.
  • the duration of the charging process is therefore regulated by varying the current threshold to a desired value. In this case, only the accuracy of the set charging time depends on how exactly the current threshold can be specified, and whether this injector-individual and thus cylinder-individually possible.
  • Fig. 1 shows a schematic representation of a known from the prior art injection valve 1 with a central bore.
  • a control piston 3 introduced with a piezoelectric actuator 2 in the central bore, wherein the actuating piston 3 is fixedly connected to the actuator 2.
  • the actuating piston 3 closes upwards a hydraulic coupler 4, while at the bottom an opening with a connecting channel to a first seat 6 is provided, in which a piston 5 is arranged with a valve closing member 12.
  • the valve closing member 12 is formed in this embodiment as a double-closing control valve, but it can also be designed as a simple closing control valve. It closes the first seat 6 when the actuator 2 is at rest.
  • a nozzle needle 11 is arranged in a corresponding channel, which closes or opens the outlet in a high pressure channel (common rail pressure) 13, depending on which control voltage U is present.
  • the high pressure is supplied through the medium to be injected, for example fuel for an internal combustion engine, via an inlet 9, via an inlet throttle 8 and an outlet throttle 10, the inflow amount of the medium in the direction of the nozzle needle 11 and the hydraulic coupler 4 is controlled.
  • the hydraulic coupler 4 has the task on the one hand to increase the stroke of the piston 5 and on the other hand to decouple the control valve from the static temperature expansion of the actuator 2. The refilling of the coupler 4 is not shown here.
  • a high pressure which may be in the common rail system, for example, between 200 and 2000 bar. This pressure acts against the nozzle needle 11 and keeps it closed, so that no fuel can escape. If, as a result of the control voltage U, the actuator 2 is actuated, and thus the closure member 12 is moved in the direction of the second seat, the pressure in the high-pressure region is reduced and the nozzle needle 11 releases the injection channel.
  • P 1 is the so-called coupler pressure, as it is present in the hydraulic coupler 4. In the coupler 4 is set without control U, a stationary pressure P 1 . After discharging the actuator 2, the coupler pressure P 1 is approximately 0 and is raised again by refilling.
  • the stroke and the force of the actuator 2 now correlate with the voltage with which the actuator 2 is charged. Since the force is proportional to the rail pressure, the voltage for a required Aktorhub for safe reaching the seat 7 must be adjusted depending on the rail pressure.
  • the voltage necessary for the proper operation of the injection valve or injector 1 at an operating point is the so-called voltage requirement, that is to say the relationship between voltage and stroke at a certain force, which is proportional to the rail pressure. From the DE 103 158 15.4 shows how can be derived from the voltage difference between maximum actuator voltage and steady-state voltage of the individual, current voltage requirement of an injector.
  • a voltage U rule of the actuator 2 is measured shortly before the start of the discharge process and adjusted to a desired value.
  • the manipulated variable used for this purpose is the so-called switch-off voltage threshold U switch-off, that is to say the voltage at which the charging process is terminated.
  • the duration of the charging edge is set to a setpoint ⁇ t L of typically 100 microseconds. This setting is done either by control or by controlling a switching threshold I s for the charging current, which thus serves as a manipulated variable. To vary the charging time .DELTA.t L so the charging current I is varied.
  • the switching valves of all injectors at the end of the loading flank have a uniform distance from their stroke stop. Moreover, if the duration of the charging process is kept constant, it is ensured that this uniform distance is achieved in each case at a defined time after the start of control.
  • the lifting movement of the switching valve 12 is practically independent of parameters such as actuator idle stroke, actuator stiffness, stiffness of the transmission chain actuator valve, seat diameter of the valve, etc. Or, in other words, the switching valve movements of different injectors can be set to a same course, namely without these parameters need to be known.
  • a first embodiment shown in FIG Fig. 3 the difference between the cut-off voltage and the voltage of the actuator 2 is controlled shortly before the start of the discharge by changing the manipulated variable I s , the duration of the charging edge is fixed by stopping the charging after a predetermined period of time .DELTA.t L.
  • a circuit unit 310 is provided for a feedforward control for the manipulated variable I s , to which the rail pressure P rail is supplied as an input variable.
  • a circuit unit 320 is provided, which shut a controller for the difference of the cut-off voltage U and the Voltage of the actuator 2 shortly before the start of the discharge process U rule forms, which is fed to a predefinable setpoint input.
  • the outputs of the circuit units 310 and 320 are added and fed to a drive module 330, which in turn drives a piezo output stage 335, which supplies the actuator voltage U and the actuator current I of the actuator 2.
  • the piezo output stage 335 supplies the switch- off voltage U switch-off and the voltage of the actuator 2 shortly before the start of the discharge process U rule , the difference of which is formed in a switching point 340. This difference is supplied to the circuit unit 320.
  • the regulation is now carried out by varying the manipulated variable I s . If this manipulated variable of the current increases, then the voltage to which the actuator 2 is charged increases, the remaining path of the valve after the end of the charging process drops and thus also the voltage difference to be adjusted.
  • the in Fig. 4 shown in FIG Fig. 4 , the schematic unit to a controller for the charging time 410, to which a predetermined setpoint can be fed.
  • a circuit unit 420 is s provided for the pilot control of the threshold current I which is supplied as an input variable to the rail pressure p rail and a circuit unit 430, which shut a controller for the difference of the Abschaltschreibsschwelle U and the voltage of the actuator 2 just before the start the discharging U rule comprises further a circuit unit 440 for pilot control of the U Abschaltschreibsschwelle shutdown.
  • the controller 430 becomes outputted value and the output from the feedforward control for the switch-off voltage 440 value U abschalt added and this value of the switch- off threshold U disconnected a control module 460 which controls the actuator 2 via a piezo amplifier 465, that is, the actuator voltage U and the actuator current I is available ,
  • the piezo output stage 465 also outputs a signal for the duration of the charging process, which is supplied to the circuit unit 410, which forms the regulator for the charging time.
  • the control circuit for the difference U shutoff - U rule is only activated when a control condition is met, for example, that it is checked whether the activation duration exceeds a threshold value or whether the injection quantity setpoint exceeds an injection amount threshold. If the controller is inactive, the manipulated variables are "frozen" as a function of the prevailing rail pressure. This avoids that the control reacts to after the end of the charging several hundred microseconds lasting ringing of the actuator 2, which are reflected in the voltage curve of the actuator.
  • the respective manipulated variable can set the difference U Abtician - U rule to introduce a rail horrine diagnostic threshold, when they reach the associated injector is detected as defective.
  • This information can be read out via a diagnostic interface, for example during maintenance of the internal combustion engine, and this greatly simplifies troubleshooting.

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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 permettant de déterminer les flancs de charge d'un actionneur piézo-électrique (2) d'au moins un injecteur, à l'aide duquel une quantité de liquide sous haute pression est injectée dans une cavité, notamment une chambre de combustion de moteur à combustion interne. Ledit procédé se caractérise en ce que la différence entre un seuil de tension de coupure (Ucoupure) et une tension de l'actionneur (2) est ajustée à une valeur théorique prédéterminable, peu de temps avant le début du processus de décharge (Uréglage).

Claims (11)

  1. Procédé de détermination du flanc de charge de l'actionneur piézo-électrique (2) d'au moins un injecteur qui injecte une quantité de liquide sous haute pression dans une cavité, en particulier dans une chambre de combustion d'un moteur à combustion interne, caractérisé en ce que
    la différence entre un seuil de tension de débranchement (Uabschalt), c'est-à-dire la tension qui, lorsqu'elle est atteinte, interrompt l'opération de charge, et la tension (URegel) de l'actionneur (2) peu avant le début de l'opération de décharge est régulée à une valeur de consigne prédéterminée.
  2. Procédé selon la revendication 1, caractérisé en ce que la régulation de la différence entre le seuil de tension de débranchement (Uabschalt) et la tension (URegel) de l'actionneur (2) peu avant l'opération de décharge à la valeur de consigne prédéterminée s'effectue par variation d'un seuil (Is) de courant de charge dans un intervalle prédéterminé de durée de charge (ΔtL).
  3. Procédé selon la revendication 1, caractérisé en ce que la régulation de la différence entre le seuil de tension de débranchement (Uabschalt) et la tension (URegel) de l'actionneur (2) peu avant l'opération de décharge à la valeur de consigne prédéterminée s'effectue par variation du seuil de tension de débranchement (Uabschalt).
  4. Procédé selon revendication 2, caractérisé en ce que la durée de chargement (ΔtL) est modifiée ou régulée à une valeur de consigne par modification du seuil (Is) de courant de charge.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que le seuil (Is) de courant de charge, la durée de chargement (ΔtL) et/ou le seuil (Uabschalt) de tension de débranchement sont comparés à des valeurs prédéterminées de seuil de diagnostic qui, lorsqu'elles sont atteintes, indiquent que l'injecteur est défectueux.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que la régulation de la différence entre la tension de débranchement et la tension peu avant le début de l'opération de décharge ne s'effectue que si une condition de régulation est remplie et en ce que lorsque la condition de régulation n'est pas remplie, on utilise comme grandeurs de réglage de la boucle de régulation la valeur de la grandeur de réglage qui était valide lorsque le moteur à combustion interne fonctionnait pour la dernière fois en respectant la condition de régulation dans la plage de pression effective de rampe.
  7. Procédé selon la revendication 6, caractérisé en ce que la condition de régulation est que le résultat de la comparaison de la durée d'activation dépasse une valeur de seuil de durée d'activation.
  8. Procédé selon la revendication 7, caractérisé en ce que la condition de régulation est satisfaite lorsque la durée d'activation est supérieure à la valeur de seuil de durée d'activation.
  9. Procédé selon la revendication 6, caractérisé en ce que l'on utilise comme condition de régulation le résultat de la comparaison de la valeur de consigne de la quantité injectée et d'une valeur de seuil de la quantité injectée.
  10. Procédé selon la revendication 9, caractérisé en ce que la condition de régulation est remplie lorsque la valeur de consigne de quantité injectée est supérieure à la valeur de seuil de quantité injectée.
  11. Dispositif de détermination du flanc de charge de l'actionneur piézo-électrique (2) d'au moins un injecteur qui injecte une quantité du liquide sous haute pression dans une cavité, en particulier dans une chambre de combustion d'un moteur à combustion interne, caractérisé par une unité de commutation qui régule à une valeur prédéterminée la différence entre le seuil de tension de débranchement (Uabschalt), c'est-à-dire la tension qui interrompt l'opération de charge lorsqu'elle est atteinte, et la tension de l'actionneur (2) peu avant l'opération de décharge.
EP05701432A 2004-02-18 2005-01-04 Procede et dispositif pour determiner les flancs de charge d'un actionneur piezo-electrique Expired - Fee Related EP1718854B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410007798 DE102004007798A1 (de) 2004-02-18 2004-02-18 Verfahren und Vorrichtung zum Bestimmen der Ladeflanken eines piezoelektrischen Aktors
PCT/EP2005/050017 WO2005080776A1 (fr) 2004-02-18 2005-01-04 Procede et dispositif pour determiner les flancs de charge d'un actionneur piezo-electrique

Publications (2)

Publication Number Publication Date
EP1718854A1 EP1718854A1 (fr) 2006-11-08
EP1718854B1 true EP1718854B1 (fr) 2009-03-11

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EP05701432A Expired - Fee Related EP1718854B1 (fr) 2004-02-18 2005-01-04 Procede et dispositif pour determiner les flancs de charge d'un actionneur piezo-electrique

Country Status (5)

Country Link
EP (1) EP1718854B1 (fr)
JP (1) JP4130840B2 (fr)
CN (1) CN1922397B (fr)
DE (2) DE102004007798A1 (fr)
WO (1) WO2005080776A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006059070A1 (de) * 2006-12-14 2008-06-19 Robert Bosch Gmbh Kraftstoffeinspritzsystem und Verfahren zum Ermitteln eines Nadelhubanschlags in einem Kraftstoffeinspritzventil
DE102007008201B3 (de) 2007-02-19 2008-08-14 Siemens Ag Verfahren zur Regelung einer Einspritzmenge eines Injektors einer Brennkraftmaschine
DE102007022591A1 (de) 2007-05-14 2008-11-27 Robert Bosch Gmbh Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine
JP4911197B2 (ja) * 2009-06-01 2012-04-04 株式会社デンソー 直動式燃料噴射弁の制御装置
DE102012207747A1 (de) 2012-05-09 2013-11-14 Robert Bosch Gmbh Verfahren zum Betreiben eines Piezoaktors

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2536114B2 (ja) * 1989-01-18 1996-09-18 トヨタ自動車株式会社 圧電素子の駆動装置
DE60039676D1 (de) * 2000-04-01 2008-09-11 Bosch Gmbh Robert Vorrichtung und Verfahren zur Erkennung eines Kurzschlusses zur Batteriespannung während der Ansteuerung piezoelektrischer Elemente
EP1138909B1 (fr) * 2000-04-01 2005-09-21 Robert Bosch GmbH Procédé et dispositif de commande du procédé d'injection de combustible
DE60011993T2 (de) * 2000-04-01 2004-12-09 Robert Bosch Gmbh Apparat und Methode für das Ermitteln einer Verringerung der Kapazität während des Antriebes von piezoelektrischen Elementen
DE50009866D1 (de) * 2000-07-01 2005-04-28 Bosch Gmbh Robert Piezoelektrischer Aktor eines Einspritzventils
DE10032022B4 (de) 2000-07-01 2009-12-24 Robert Bosch Gmbh Verfahren zur Bestimmung der Ansteuerspannung für ein Einspritzentil mit einem piezoelektrischen Aktor
JP4023665B2 (ja) * 2002-02-01 2007-12-19 株式会社日本自動車部品総合研究所 ピエゾアクチュエータ制御装置、ピエゾアクチュエータ制御方法および燃料噴射制御システム
DE10315815A1 (de) 2003-04-07 2004-10-21 Robert Bosch Gmbh Verfahren zur Ermittlung der individuellen Ansteuerspannung eines piezoelektrischen Elements
DE10340137A1 (de) 2003-09-01 2005-04-07 Robert Bosch Gmbh Verfahren zur Bestimmung der Ansteuerspannung eines piezoelektrischen Aktors eines Einspritzventils

Also Published As

Publication number Publication date
JP4130840B2 (ja) 2008-08-06
JP2006525455A (ja) 2006-11-09
CN1922397B (zh) 2010-09-08
WO2005080776A1 (fr) 2005-09-01
CN1922397A (zh) 2007-02-28
DE502005006809D1 (de) 2009-04-23
EP1718854A1 (fr) 2006-11-08
DE102004007798A1 (de) 2005-09-08

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