EP1664511B1 - Procede de determination de la tension de commande d'un actionneur piezoelectrique d'une soupape d'injection - Google Patents

Procede de determination de la tension de commande d'un actionneur piezoelectrique d'une soupape d'injection Download PDF

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Publication number
EP1664511B1
EP1664511B1 EP04762364A EP04762364A EP1664511B1 EP 1664511 B1 EP1664511 B1 EP 1664511B1 EP 04762364 A EP04762364 A EP 04762364A EP 04762364 A EP04762364 A EP 04762364A EP 1664511 B1 EP1664511 B1 EP 1664511B1
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EP
European Patent Office
Prior art keywords
voltage
injector
drive voltage
adjustment
pressure
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
EP04762364A
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German (de)
English (en)
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EP1664511A1 (fr
Inventor
Andreas Huber
Kai Sutter
Marco Gangi
Jens Bloemker
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1664511A1 publication Critical patent/EP1664511A1/fr
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Expired - Fee Related legal-status Critical Current
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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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2464—Characteristics of actuators
    • F02D41/2467—Characteristics of actuators for injectors

Definitions

  • the invention relates to a method for determining the drive voltage of a piezoelectric actuator of an injection valve according to the preamble of claim 1.
  • 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 for correcting the drive voltage ua for the actuator. Too low an induced voltage is used to detect an injection misfire.
  • the injection valve is preferably used for fuel injection for a gasoline or diesel engine, in particular for 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, the relationship between tension and lift at a given force that is proportional to the rail pressure.
  • the invention is therefore based on the object to compensate for this drift in the voltage requirement.
  • This object is achieved by a method for determining the drive voltage of a piezoelectric actuator of an injection valve having the features of claim 1.
  • the method according to the invention makes it possible to compensate for the drift in the voltage requirement by adapting the voltage setpoint and thus to ensure that the required, nominal actuator stroke is achieved and the correct and desired operation of the injector over the entire service life is ensured.
  • An adaptation of the voltage requirement also has the advantage that does not have to be controlled in principle with a very high voltage bias, resulting in significant benefits in terms of power consumption / power loss.
  • the adaptation of the voltage requirement can also be used for diagnostic purposes, for example, to output an error message in the event of an inadmissibly high drift in the voltage requirement.
  • the control of the drift of the voltage requirement is advantageously carried out during a driving cycle of a vehicle having the internal combustion engine, wherein the correction values determined during the driving cycle are stored in a non-volatile memory. This in particular opens up the possibility of using the correction values stored in the memory in a later driving cycle as initialization values for a further compensation of the drift in the voltage requirement.
  • a release logic is preferably provided, which is an adaptation of the drift the voltage requirement as a function of the internal combustion engine and / or the injection valve characterizing parameters releases.
  • These parameters are, for example, the temperature of the internal combustion engine and / or the rail pressure and / or the stationary state of the voltage regulation and / or the state of the charging time regulation and / or the stationary state of other subordinate control circuits and / or the number of injections and / or the activation duration and / or the injection sequence per cycle, that is to say in a sense the injection pattern (pilot injection (s), main injection, post-injection (s)).
  • the compensation of the voltage requirement at different operating points with respect to the rail pressure wherein the correction values are stored in Korrekturkennfeldem, which are then stored in non-volatile memory, such as an E 2 PROM.
  • Fig. 1 shows a schematic representation of a known from the prior art injection valve 1 with a central bore.
  • an actuating piston 3 In the upper part of an actuating piston 3 is 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 as a double-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 drive voltage Ua is applied.
  • the high pressure is transmitted through the medium to be injected, for example fuel for an internal combustion engine 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 Ua, 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 measured in the hydraulic coupler 4.
  • a stationary pressure P 1 which is for example 1/10 of the pressure in the high pressure part. 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 railtikin.
  • 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 15 815 A1 shows how out of the voltage difference between maximum actuator voltage and stationary end voltage of the individual, current voltage requirement of an injector can be derived.
  • This drift now drifts over the life of the injector 1.
  • the drift causes the operating point-dependent predetermined actuator voltage no longer ensures proper operation of the injector 1 at the specified operating point, resulting in errors in the injection quantity with consequences on exhaust emissions / noise, up to a Failure of the injector leads, namely, when the hub is no longer sufficient to open the nozzle needle 11.
  • the method described below makes it possible to compensate for this drift of the voltage requirement injector-individual.
  • the basic idea of the invention is to compensate for the drift of the voltage requirement by adapting the voltage setpoint and thus to ensure that the required nominal actuator stroke can be achieved and the proper and desired operation of the injector 1 can be ensured over its entire service life.
  • the function of the actuator 2 is ensured, but on the other hand, the above-described errors of the injection quantity are avoided.
  • Such an adaptation of the voltage requirement also avoids, basically to control with a very high voltage reserve, which is particularly advantageous in terms of power consumption / power loss of a control device and further reduces the wear of the actuator 2, since the actuator 2 does not over a lifetime with a large Voltage reserve must be operated, which leads to an excessive force in the valve seat.
  • a diagnosis of the entire injection valve can also take place, for example if an impermissibly high drift in the voltage requirement is detected.
  • the adaptation of the drift of the voltage requirement is based on an injector-specific regulation of the voltage difference between the switch-off voltage threshold U Ab and the measured, stationary final voltage U Rule (cf. Fig. 2 ) to a required for an operating point setpoint .DELTA.U soll , with the required Aktorhub a non drifted, the means nominally behaving injector correlated.
  • This regulation intervenes in a corrective manner by injector-specific adaptation of the nominal actuator voltage, as described below in connection with FIG Fig. 3 will be described in more detail.
  • an actuator target voltage U soll is calculated.
  • the difference ⁇ U is the cut-off voltage U Ab and the control voltage U rule continuously determined.
  • This difference .DELTA.U is compared with a predetermined size .DELTA.U soll , wherein in a node 320, the difference of the size .DELTA.U soll and .DELTA.U is determined.
  • This difference e ⁇ U forms the input variable for an example PI controller, wherein in each case for the individual cylinders different controllers 331, 332, 33n are provided. In these controls each individual cylinder correction signals S1, S2, S n are determined and output, where n is the number of cylinders, respectively.
  • the correction values are either multiplied by the setpoint voltage U soll determined in the arithmetic unit 310 or added to it as an alternative, which is indicated by connection points 341, 342.
  • the corrected values U sollkorr determined in this way are supplied to an actuator voltage control device 350 which determines the switch-off voltage threshold U Ab .
  • This Abschaltwoodsschwelle U From now along with the self-adjusting stationary terminal voltage U usually turn to determine the difference .DELTA.U is used.
  • the correction values S1, S2, .... S n learned during a drive cycle are preferably stored in a nonvolatile memory 360, for example in an E 2 PROM, after the end of the drive cycle and used as initialization values for the further adaptation before the beginning of the following drive cycle as it is in Fig. 3 is schematically represented by an arrow labeled "INIT" arrow 362. It should be noted at this point that for the calculation of the voltage difference .DELTA.U is not for the above-described method, the maximum voltage U max (see. Fig.
  • a release logic circuit implemented in a circuit unit 370 is provided which monitors typical parameters for enabling the adaptation.
  • These parameters of the internal combustion engine and / or the injection valve are for example the temperature of the internal combustion engine and / or the rail pressure and / or the stationary state of the voltage regulation and / or the state of the charging time control and / or the stationary state of other subordinate control circuits and / or the number of Injections and / or the control duration and / or the injection sequence per cycle, that is, in a sense, the injection pattern (pre-injection (s), main injection, post-injection (s)).
  • Whether, for example, a stationary state of the voltage control is present, is checked by comparing the size U sollkorr and U rule . Only when U sollkorr and U generally match, are determined by the switching unit 370 the PI controller 331, activated 332 ... 33n so that the above-described adjustment of the difference .DELTA.U is to .DELTA.U can take place, and thereby can be adapted to the drift of the voltage requirement to ,
  • the test shows that the actuator voltage regulation is not stationary, ie if U sollkorr deviates from U rule , then the PI controllers 331, 332,... 33n are switched off by the enable logic circuit unit 370 and the correction values S1, S2,. .. S n remain unchanged, are frozen in a sense.
  • the correction of the voltage setpoint at the switching points 341/342 continues to take place with the previously learned values S1, S2, ... S n .
  • Such a "freezing" of the correction values is possible because the injector drift is very slow.
  • the above-described method can initially be carried out only at one operating point (rail pressure) and the correction values obtained can be used for all operating points. To increase the accuracy of the method can also be performed at several different operating points (rail printing).

Abstract

L'invention concerne un procédé de détermination de la tension de commande d'un actionneur piézoélectrique d'au moins un injecteur (1). Ce procédé consiste à injecter une quantité de liquide sous pression dans une cavité, notamment dans une chambre de chauffe d'un moteur à combustion interne, la tension de commande variant en fonction de la pression à laquelle la quantité de liquide est alimentée. L'invention est caractérisée en ce que la dérive de la tension de commande (besoin de tension) nécessaire à la course donnée d'une soupape de commande de l'injecteur est réglée individuellement pour chaque injecteur à une valeur théorique donnée pour un point de travail par réglage de la différence entre le seuil de tension d'arrêt (Uab) et la tension finale fixe (U regel)

Claims (6)

  1. Procédé pour déterminer la tension d'amorçage d'un actionneur piézoélectrique d'au moins un injecteur avec lequel une quantité de liquide est injectée sous haute pression dans un espace creux, la tension d'amorçage variant en fonction de la pression à laquelle est soumise la quantité de liquide, caractérisé en ce qu'une dérive de la tension d'amorçage (Usoll) nécessaire pour une course prédéfinie d'une vanne de commande de l'injecteur est compensée individuellement par injecteur à une valeur de consigne (ΔUsoll) prévue pour un point de fonctionnement, en régulant la différence (ΔUist) entre un seuil de tension d'arrêt (Uab) et une tension finale (URegel) fixe qui s'établit.
  2. Procédé selon la revendication 1, caractérisé en ce que la régulation s'effectue pendant un cycle de déplacement d'un véhicule équipé du moteur à combustion interne et les valeurs de correction de la tension d'amorçage déterminées pendant le cycle de déplacement sont enregistrées dans une mémoire non volatile (360).
  3. Procédé selon la revendication 1, caractérisé en ce que les valeurs de correction enregistrées dans la mémoire non volatile (360) sont utilisées dans un cycle de déplacement ultérieur comme valeurs d'initialisation pour une régulation au cours de ce cycle de déplacement.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'une validation de la régulation a lieu en fonction des paramètres qui caractérisent le moteur à combustion interne et/ou la vanne d'injection.
  5. Procédé selon la revendication 4, caractérisé en ce que la validation a lieu en fonction d'un ou plusieurs des paramètres suivants : température du moteur à combustion interne, pression dans la rampe de distribution, état stationnaire de la régulation du temps de charge, état stationnaire de la régulation de tension, durée de l'amorçage, nombre d'injections, séquence d'injection, écart de régulation des dispositifs de régulation subordonnés.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la régulation est déterminée à différents points de fonctionnement et les valeurs de correction sont stockées dans des diagrammes caractéristiques de correction.
EP04762364A 2003-09-01 2004-07-10 Procede de determination de la tension de commande d'un actionneur piezoelectrique d'une soupape d'injection Expired - Fee Related EP1664511B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10340137A DE10340137A1 (de) 2003-09-01 2003-09-01 Verfahren zur Bestimmung der Ansteuerspannung eines piezoelektrischen Aktors eines Einspritzventils
PCT/DE2004/001504 WO2005026516A1 (fr) 2003-09-01 2004-07-10 Procede de determination de la tension de commande d'un actionneur piezoelectrique d'une soupape d'injection

Publications (2)

Publication Number Publication Date
EP1664511A1 EP1664511A1 (fr) 2006-06-07
EP1664511B1 true EP1664511B1 (fr) 2009-03-25

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EP04762364A Expired - Fee Related EP1664511B1 (fr) 2003-09-01 2004-07-10 Procede de determination de la tension de commande d'un actionneur piezoelectrique d'une soupape d'injection

Country Status (6)

Country Link
US (1) US7456545B2 (fr)
EP (1) EP1664511B1 (fr)
JP (1) JP4532490B2 (fr)
CN (1) CN100434682C (fr)
DE (2) DE10340137A1 (fr)
WO (1) WO2005026516A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011003709A1 (de) 2011-02-07 2012-08-09 Robert Bosch Gmbh Verfahren zum Bestimmen der Ansteuerspannung eines piezoelektrischen Aktors

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DE102004007798A1 (de) 2004-02-18 2005-09-08 Robert Bosch Gmbh Verfahren und Vorrichtung zum Bestimmen der Ladeflanken eines piezoelektrischen Aktors
DE102006011725B4 (de) * 2006-03-14 2015-05-28 Continental Automotive Gmbh Verfahren und Vorrichtung zum Kalibrieren eines Piezo-Aktuators
US7675425B2 (en) * 2006-04-10 2010-03-09 Canon Kabushiki Kaisha Liquid discharge device capable of self-diagnosis of discharge functions
EP1860312B1 (fr) * 2006-05-23 2009-03-18 Delphi Technologies, Inc. Procédé de fonctionnement d'un injecteur à carburant
DE102006058744A1 (de) 2006-12-12 2008-06-19 Robert Bosch Gmbh Verfahren zum Betreiben eines Einspritzventils
DE102007020061B3 (de) 2007-04-27 2008-10-16 Siemens Ag Verfahren und Datenträger zum Auslesen und/oder Speichern von injektorspezifischen Daten zur Steuerung eines Einspritzsystems einer Brennkraftmaschine
DE102007022591A1 (de) 2007-05-14 2008-11-27 Robert Bosch Gmbh Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine
FR2917461B1 (fr) * 2007-06-12 2009-07-31 Renault Sas Procede de correction des derives des injecteurs d'un moteur
DE102007034188A1 (de) * 2007-07-23 2009-01-29 Robert Bosch Gmbh Verfahren zum Betreiben eines Einspritzventils
DE102008001971A1 (de) * 2008-05-26 2009-12-03 Robert Bosch Gmbh Verfahren zur Diagnose eines Lastabfalls
DE102008027516B3 (de) * 2008-06-10 2010-04-01 Continental Automotive Gmbh Verfahren zur Einspritzmengenabweichungsdetektion und zur Korrektur einer Einspritzmenge sowie Einspritzsystem
DE102009002483A1 (de) * 2009-04-20 2010-10-21 Robert Bosch Gmbh Verfahren zum Betreiben eines Einspritzventils
DE102009003176A1 (de) * 2009-05-18 2010-11-25 Robert Bosch Gmbh Verfahren und Steuergerät zum Betreiben eines piezoelektrischen Aktors
WO2011146907A2 (fr) 2010-05-20 2011-11-24 Cummins Intellectual Properties, Inc. Système d'injecteur de carburant piézoélectrique, procédé d'estimation de caractéristiques de calage d'événement d'injecteur de carburant
DE112012000505B4 (de) 2011-01-19 2018-04-05 Cummins Intellectual Property, Inc. Kraftstoffeinspritzdüse mit einem piezoelektrischen Aktuator und einer Sensoranordnung
FR2972711B1 (fr) * 2011-03-17 2013-04-19 Hispano Suiza Sa Alimentation en energie electrique d'un aeronef
FR2990998B1 (fr) * 2012-05-23 2016-02-26 Continental Automotive France Procede de pilotage d'au moins un actionneur piezoelectrique d'injecteur de carburant d'un moteur a combustion interne
DE102014225147A1 (de) * 2014-12-08 2016-06-09 Robert Bosch Gmbh Verfahren zur Identifikation einer Kennlinie

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EP1138909B1 (fr) * 2000-04-01 2005-09-21 Robert Bosch GmbH Procédé et dispositif de commande du procédé d'injection de combustible
EP1172541B1 (fr) * 2000-07-01 2005-03-23 Robert Bosch GmbH Actionneur piézo-électrique pour système d'injection
DE10032022B4 (de) 2000-07-01 2009-12-24 Robert Bosch Gmbh Verfahren zur Bestimmung der Ansteuerspannung für ein Einspritzentil mit einem piezoelektrischen Aktor
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Publication number Priority date Publication date Assignee Title
DE102011003709A1 (de) 2011-02-07 2012-08-09 Robert Bosch Gmbh Verfahren zum Bestimmen der Ansteuerspannung eines piezoelektrischen Aktors
DE102011003709B4 (de) 2011-02-07 2018-06-07 Robert Bosch Gmbh Verfahren zum Bestimmen der Ansteuerspannung eines piezoelektrischen Aktors

Also Published As

Publication number Publication date
US7456545B2 (en) 2008-11-25
US20070182280A1 (en) 2007-08-09
EP1664511A1 (fr) 2006-06-07
CN1816690A (zh) 2006-08-09
CN100434682C (zh) 2008-11-19
JP2007504386A (ja) 2007-03-01
JP4532490B2 (ja) 2010-08-25
WO2005026516A1 (fr) 2005-03-24
DE10340137A1 (de) 2005-04-07
DE502004009228D1 (de) 2009-05-07

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