EP1664511A1 - 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

Info

Publication number
EP1664511A1
EP1664511A1 EP04762364A EP04762364A EP1664511A1 EP 1664511 A1 EP1664511 A1 EP 1664511A1 EP 04762364 A EP04762364 A EP 04762364A EP 04762364 A EP04762364 A EP 04762364A EP 1664511 A1 EP1664511 A1 EP 1664511A1
Authority
EP
European Patent Office
Prior art keywords
voltage
control
injector
internal combustion
combustion engine
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
EP04762364A
Other languages
German (de)
English (en)
Other versions
EP1664511B1 (fr
Inventor
Andreas Huber
Kai Sutter
Marco Gangi
Jens Bloemker
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
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1664511A1 publication Critical patent/EP1664511A1/fr
Application granted granted Critical
Publication of EP1664511B1 publication Critical patent/EP1664511B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • F02D41/24—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 control voltage of a piezoelectric actuator of an injection valve according to the preamble of claim 1.
  • DE 100 32 022 AI discloses a method for determining the control voltage for a piezoelectric actuator of an injection valve, in which the pressure in a hydraulic coupler is initially measured indirectly before the next injection process.
  • the pressure is measured in 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 control voltage for the actuator, among other things.
  • An induced voltage that is too low serves to detect a 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, among other things, so that the control 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 required for the correct operation of the injector at one operating point is the so-called voltage requirement, that means the relationship between tension and stroke at a certain force, which is proportional to the rail pressure.
  • the invention is therefore based on the object of compensating for this drift in the voltage requirement.
  • This object is achieved by a method for determining the control voltage of a piezoelectric actuator of an injection valve with 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 that the injector is operated correctly and properly over its entire service life.
  • An adaptation of the voltage requirement also has the advantage that it is not always necessary to control with a very high voltage supply, which results in considerable advantages with regard to the power consumption / power loss.
  • the adaptation of the voltage requirement can also be used for diagnostic purposes, for example in order to output an error message if the voltage requirement drifts excessively.
  • the regulation of the drift of the voltage requirement is advantageously carried out during a driving cycle of a vehicle having the internal combustion engine, the correction values determined during the driving cycle being stored in a non-volatile memory. This opens up the possibility, in particular, of using the correction values stored in the memory in a later driving cycle as initialization values for further compensation for the drift in the voltage requirement.
  • a release logic is preferably provided which adapts the drift releases the voltage requirement as a function of parameters characterizing the internal combustion engine and / or the injection valve.
  • these parameters are, for example, the temperature of the internal combustion engine and / or the rail pressure and / or the steady state of the voltage regulation and / or the state of the charging time regulation and / or the steady state of other subordinate control loops and / or the number of injections and / or the actuators and / or the injection sequence per work cycle, that is to say the injection pattern (pre-injection (s), main injection, post-injection (s)).
  • the voltage requirement is particularly advantageously compensated for at various operating points with respect to the rail pressure, the correction values being stored in correction maps, which are then also stored in the non-volatile memory, for example an E 2 -PROM.
  • FIG. 1 shows the schematic structure of an injection valve known from the prior art
  • Fig. 2 schematically shows a diagram of the actuator voltage over time during a control
  • FIG. 3 schematically shows a block diagram of a control device making use of the method according to the invention.
  • FIG. 1 shows a schematic illustration of an injection valve 1 known from the prior art with a central bore.
  • an actuating piston 3 with a piezoelectric actuator 2 is introduced into the central bore, the actuating piston 3 being firmly connected to the actuator 2.
  • the actuating piston 3 closes off a hydraulic coupler 4 at the top, while at the bottom there is an opening with a connecting channel to a first seat 6, in which a piston 5 with a valve closing member 12 is arranged.
  • the valve closing member 12 is designed 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 control voltage Ua is present.
  • the high pressure is generated by the medium to be injected, for example fuel for a combustion motor, fed 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.
  • Pi is the so-called coupler pressure as it is measured in the hydraulic coupler 4. In the coupler 4, without control Ua, a stationary pressure Pi is set which is, for example, 1/10 of the pressure in the high-pressure part. After the actuator 2 has been discharged, the coupler pressure Pi 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 actuator stroke must be adjusted depending on the rail pressure in order to safely reach the seat 7.
  • the voltage required for the correct 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.
  • DE 103 158 15.4 shows how the voltage difference between maximum actuator voltage and stationary final voltage, the individual, current voltage requirement of an injector can be derived.
  • the drift means that the operating point-dependent predetermined actuator voltage no longer ensures proper operation of the injector 1 at the specified operating point, which leads to errors in the injection quantity with consequences on exhaust gas values / noise, up to one Failure of the injector, when the stroke is no longer sufficient to open the nozzle needle 11.
  • the method described below makes it possible to compensate for this drift in the voltage requirement individually for the injector.
  • the basic idea of the invention is 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 that the injector 1 can be operated correctly and as desired over its entire service life. On the one hand, this ensures the function of the actuator 2, but also avoids the above-described errors in the injection quantity.
  • Such an adaptation of the voltage requirement also avoids triggering with a very high voltage supply, which is particularly advantageous in relation to the power consumption / power loss of a control device and also reduces the wear on the actuator 2, since the actuator 2 does not work with a large voltage supply must be operated, which leads to excessive force in the valve seat.
  • the entire injection valve can be diagnosed by monitoring the corrective action of the adaptation, for example if an inadmissibly high drift in the voltage requirement is determined.
  • the adaptation of the drift of the voltage requirement is based on an injector individual control of the voltage difference between Abschaltwoodsschwelle U Ab and the measured, steady state final voltage U Re g e i to a required for an operating setpoint .DELTA.U so n, which with the required Actuator stroke of a non-drifted one means nominally behaving injector correlated.
  • This regulation intervenes in a corrective manner by adapting the actuator target voltage individually to the injector, as will be described in more detail below in connection with FIG. 3.
  • An actuator target voltage U s0 n is calculated in a computing unit 310.
  • the difference ⁇ Ui St between the cut-off voltage U Ab and the control voltage U Rege i is continuously determined.
  • This difference ⁇ Uj St is compared with a predetermined size .DELTA.U S0H, wherein in a junction point 320 so ⁇ , the difference of size and .DELTA.U ⁇ Uj St is determined.
  • This difference e A ⁇ j forms the input variable for a PI controller, for example, in which different controllers 331, 332, 33n are provided for the individual cylinders. In these controls ils cylinder-specific correction signals Sl, S2, S n jew are determined and output, where n is the number of cylinders, respectively.
  • the correction values are either multiplied by the target voltage U so n determined in the computing unit 310 or alternatively added to this, which is indicated by connection points 341, 342.
  • the corrected values U s ⁇ o ⁇ - determined in this way are fed to an actuator voltage control device 350, which determines the switch-off voltage threshold U Ab .
  • This switch-off voltage threshold U Ab is now used, together with the stationary final voltage U Rege ⁇ , to determine the difference ⁇ Ui st .
  • the correction values S1, S2,... S n learned during a driving cycle are preferably stored in a non-volatile memory 360, for example in an E 2 -PROM, after the driving cycle has ended and are used as initialization values for the further adaptation before the beginning of the following driving cycle , as is shown schematically in FIG. 3 by an arrow 362 labeled "INIT".
  • U max cf. FIG. 2
  • the switch-off voltage threshold cannot be used to calculate the voltage difference .DELTA.Uj st ur the above-described method U From U max is not available as a usable variable in an engine control unit known per se, in which this regulation is also carried out.
  • the compensation of the voltage demand drift is also given when using the cutoff voltage U Ab .
  • a release logic circuit implemented in a circuit unit 370 is provided, which monitors typical parameters for the release of 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 steady state of the voltage control and / or the state of the charging time control and / or the steady state of other subordinate control loops and / or the Aji number of injections and / or the activation duration and / or the injection sequence per work cycle, that is to say to a certain extent the injection pattern (pre-injection (s), main injection, post-injection (s)). Whether, for example, the voltage regulation is in a steady state is checked by comparing the quantity U so ⁇ ikorr and d U Rege ⁇ .
  • the test reveals that the actuator voltage regulation is not stationary, that is if U so ⁇ i k0rr V ⁇ n U Rege ⁇ deviates, the PI controller 331, 332,... 33n are switched off by the enabling logic circuit unit 370 and the correction values Sl, S2, ... S n remain unchanged, are frozen to a certain extent.
  • the corrector of the voltage command value at the switching points 341/342 is carried out further with the previously learned values Sl, S2, ... S n. Such a "freezing" of the correction values is possible because the injector drift takes place very slowly.
  • the method described above can initially only be carried out at one working point (rail pressure) and the correction values obtained can be used for all working points. To increase the accuracy, the method can also be carried out at several different working points (rail printing).
  • the comparison of an injector-specific correction value Si, S 2 ,... S ", which represents a measure of the deviation of the voltage requirement from the standard, with a predefinable threshold value can also be used for diagnostic purposes. In this way, diagnosis of the system actuator 2, coupler 4 and switching valve, formed by the valve closing member 12, is possible.

Landscapes

  • 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 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)
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 true EP1664511A1 (fr) 2006-06-07
EP1664511B1 EP1664511B1 (fr) 2009-03-25

Family

ID=34258302

Family Applications (1)

Application Number Title Priority Date Filing Date
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)

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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
CN102933836B (zh) 2010-05-20 2015-06-03 康明斯知识产权公司 压电燃料喷射器***、估计燃料喷射事件的定时特性的方法
US9086041B2 (en) 2011-01-19 2015-07-21 Cummins Intellectual Property, Inc. Fuel injector having a piezoelectric actuator and a sensor assembly
DE102011003709B4 (de) 2011-02-07 2018-06-07 Robert Bosch Gmbh Verfahren zum Bestimmen der Ansteuerspannung eines piezoelektrischen Aktors
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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Also Published As

Publication number Publication date
CN100434682C (zh) 2008-11-19
US20070182280A1 (en) 2007-08-09
CN1816690A (zh) 2006-08-09
JP2007504386A (ja) 2007-03-01
EP1664511B1 (fr) 2009-03-25
US7456545B2 (en) 2008-11-25
JP4532490B2 (ja) 2010-08-25
DE502004009228D1 (de) 2009-05-07
DE10340137A1 (de) 2005-04-07
WO2005026516A1 (fr) 2005-03-24

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