EP1718854A1 - 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

Info

Publication number
EP1718854A1
EP1718854A1 EP05701432A EP05701432A EP1718854A1 EP 1718854 A1 EP1718854 A1 EP 1718854A1 EP 05701432 A EP05701432 A EP 05701432A EP 05701432 A EP05701432 A EP 05701432A EP 1718854 A1 EP1718854 A1 EP 1718854A1
Authority
EP
European Patent Office
Prior art keywords
voltage
actuator
threshold
charging
difference
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
EP05701432A
Other languages
German (de)
English (en)
Other versions
EP1718854B1 (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
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 EP1718854A1 publication Critical patent/EP1718854A1/fr
Application granted granted Critical
Publication of EP1718854B1 publication Critical patent/EP1718854B1/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
    • F02D2041/2051—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 loading flank of a piezoelectric actuator of at least one injector, with which a quantity of liquid is injected under high pressure into a cavity, in particular a combustion chamber of an internal combustion engine.
  • DE 10032022 A1 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 to correct the drive voltage for the actuator before the next injection process.
  • injectors are used for example in 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 necessary voltage is the so-called voltage requirement, that is, 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 the maximum actuator voltage and the stationary final voltage is known, for example, from DE 103 15 815.4.
  • the so-called switch-off voltage i.e. the voltage when the charging process is reached, is used as the manipulated variable for this.
  • the duration of the charging flank is additionally set to a predefined setpoint of typically 100 microseconds.
  • the invention is based on the object of adjusting the loading flank in each injector in such a way 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 methods known from the prior art.
  • This object is achieved by a method and a device for determining the charging flank of a piezoelectric actuator of the type described in the introduction in that the difference between a switch-off voltage threshold and a stationary final voltage is detected and regulated to a predefinable setpoint.
  • the basic idea of the invention is therefore to keep the difference between the switch-off voltage threshold, that is, the voltage at which the charging process is terminated, and the stationary final voltage, that is, the voltage of the actuator shortly before the discharge process begins, by a control circuit.
  • 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 loading flank and is in turn a measure of the distance that the switching valve must travel after the end of the loading flank until it reaches its stroke stop. If this difference is adjusted to a constant value, the switching valves of all injectors are at a uniform distance from their respective stroke stops at the end of the loading flank.
  • the stroke movement of the switching valve is set independently of parameters such as actuator idling stroke, actuator stiffness, stiffness of the actuator-valve transmission chain, valve seat diameter, etc. for each injector, without these parameters being known have to. This also makes it possible to implicitly perform the injector voltage adjustment and the nominal voltage calibration.
  • the difference between the switch-off voltage threshold and the voltage of the actuator is regulated shortly before the start of the discharge process by varying the switch-off voltage threshold to the predefinable target value.
  • This embodiment is particularly suitable if the specification of the charging current cannot be quantized sufficiently finely or cannot be specified individually for the injector. It is also advantageous here that a variation of an already known variable and therefore not to be recorded additionally takes place.
  • the charging time is preferably additionally 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 setpoint. In this case, only the accuracy of the set charging time depends on how exactly the current threshold can be specified and whether this is possible for the individual injector and thus for the individual cylinder. drawing
  • FIG. 1 shows the schematic structure of an injection valve known from the prior art
  • FIG. 3 schematically shows a block diagram of a control device making use of the method according to the invention
  • FIG. 4 schematically shows a block diagram of a further 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, but it can also be designed as a single-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 applied.
  • High pressure is supplied by 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 quantity of the medium is controlled in the direction of the nozzle needle 11 and the hydraulic coupler 4.
  • 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 denotes the so-called coupler pressure as it is present in the hydraulic coupler 4.
  • a stationary pressure Pi is set in the coupler 4 without control U. 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 hubktorhub to safely reach the seat 7 must be adjusted depending on the rail pressure.
  • 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.
  • a voltage U R ⁇ I of the actuator 2 is measured shortly before the start of the discharge process and adjusted to a setpoint.
  • Abschaltwoodsschwelle U serves from schat t. that is, the voltage at which the charging process is terminated.
  • the duration of the charging edge is set to a target value ⁇ t of typically 100 microseconds. This setting is made either by control or by regulating a switching threshold I s for the charging current, which thus serves as a manipulated variable.
  • the charging current I is therefore varied in order to vary the charging time ⁇ t L.
  • the basic idea of the invention is now, instead of the voltage of the actuator 2 shortly before the start of the discharge process, to keep the difference between the switch-off voltage threshold Uabschatt and the voltage of the actuator 2 shortly before the start of the discharge process UR ege ⁇ constant by a control circuit and secondly the duration to keep the loading flank constant by a control or regulation.
  • the difference between the Abschalt didacticsschwelle U a b s ch a t t and the voltage of the actuator 2 just before the start of the Endladevorgangs UR e g e i represents a measure is that change in length of the actuator 2 is still executing after the end of the loading edge and is in turn a measure of which way the switching valve 12 travels after the end of the switch-off edge until it reaches its stroke stop. If this difference is adjusted to a constant value, the switching valves of all injectors are at a uniform distance from their stroke stop at the end of the loading flank. If the duration of the charging process is also kept constant, it is ensured that this uniform distance is reached at a defined point in time after the start of activation.
  • the difference between the cut-off voltage and the voltage of the actuator 2 is regulated shortly before the start of the discharge process by changing the manipulated variable I s , the duration of the charging flank being fixed by ending the charging process after the end a predeterminable time period ⁇ t.
  • a circuit unit 310 is provided for a pilot control for the manipulated variable Is, which is the rail pressure
  • a circuit unit 320 is also provided, which forms a controller for the difference between the switch-off voltage U absch h a t and the voltage of the actuator 2 shortly before the start of the discharge process URegei, which is supplied with a predefinable setpoint as an input variable.
  • the outputs of the circuit units 310 and 320 are added and fed to a control module 330, which in turn controls 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 also supplies the switch-off voltage U a bschait and the voltage of the actuator 2 shortly before the start of the discharge process UReg e i, the difference of which is formed in a switching point 340. This difference is fed to the circuit unit 320.
  • the regulation is now carried out by varying the manipulated variable Is.If this manipulated variable of the current increases, the voltage to which the actuator 2 is charged increases, the remaining travel of the valve after the end of the charging process decreases and thus also the voltage difference to be regulated.
  • the voltage difference to be regulated between the shutdown voltage threshold U absc h a t t and the voltage of the actuator 2 is carried out shortly before the start of the discharge process UR egc ⁇ by varying the already known shutdown voltage threshold Uabschatt itself.
  • the variation of the switch-off voltage threshold Uabschatt requires a variation of the charging process.
  • the circuit unit shown in FIG. 4 has a controller for the charging time 410, to which a predefinable setpoint value can be supplied.
  • a circuit unit 420 is also provided for precontrolling the current threshold I s , which is supplied as an input variable to the rail pressure P RJJI , and a circuit unit 430, which switches off a regulator for the difference between the switch-off voltage threshold U and the voltage of the actuator 2 start of the discharge comprises U Rege ⁇ , further comprising a circuit unit 440 for pilot control of the Abschaltwoodsschwelle U OCCL ai t - In a formwork tung point 450 is added to the 430 output value and the output from the feedforward control for the turn-off voltage 440 value Uabschatt of the regulator and this Abschaltsciencesschwelle value of the U a clam i t a drive module 460 is supplied which drives the actuator 2 via a piezo output stage 465, that is, the actuator voltage U and the actuator current I provides.
  • the piezo output stage 465 also outputs a signal for the duration of the charging process, which is fed to the circuit unit 410, which forms the controller for the charging time.
  • the Abschaltwoodsschwelle U Abolition i t and the voltage of the actuator 2 just before start of the discharge U Rege ⁇ in a circuit point 470 are subtracted and this difference of the circuit unit 430, which the controller for - is furthermore - as already described in connection with FIG. 3 the difference between the cut-off voltage threshold and the voltage just before the start of the discharge process includes fed.
  • the duration of the charging process .DELTA.t L is now regulated to a predefinable target value by the circuit unit 410 by varying the current threshold Is. In this case, only the accuracy of the set charging time depends on how exactly the current threshold I s can be specified and whether this is possible for the individual injector and thus for the individual cylinder. This does not affect the accuracy of the control loop for the voltage difference.
  • control circuit for the difference U is OCCL t t - U Rege i only activated when a rule condition is satisfied, for example, are that it is checked whether the activation duration exceeds a threshold value or whether the injection quantity setpoint exceeds an injection quantity threshold value. If the controller is inactive, the manipulated variables are "frozen" as a function of the prevailing rail pressure. This will prevent the regulation of a few hundred microseconds after the end of the charging process. reacts to the persistent oscillations of the actuator 2, which are reflected in the voltage profile of the actuator.
  • This information can be read out via a diagnostic interface, for example when servicing the internal combustion engine, and this greatly simplifies troubleshooting.

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 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).
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 true EP1718854A1 (fr) 2006-11-08
EP1718854B1 EP1718854B1 (fr) 2009-03-11

Family

ID=34832753

Family Applications (1)

Application Number Title Priority Date Filing Date
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
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
EP1138909B1 (fr) * 2000-04-01 2005-09-21 Robert Bosch GmbH Procédé et dispositif de commande du procédé d'injection de combustible
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
DE10032022B4 (de) 2000-07-01 2009-12-24 Robert Bosch Gmbh Verfahren zur Bestimmung der Ansteuerspannung für ein Einspritzentil mit einem piezoelektrischen Aktor
EP1167729B2 (fr) * 2000-07-01 2009-09-09 Robert Bosch Gmbh Actionneur piézo-électrique pour injecteur
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005080776A1 *

Also Published As

Publication number Publication date
EP1718854B1 (fr) 2009-03-11
JP2006525455A (ja) 2006-11-09
CN1922397A (zh) 2007-02-28
WO2005080776A1 (fr) 2005-09-01
JP4130840B2 (ja) 2008-08-06
DE102004007798A1 (de) 2005-09-08
CN1922397B (zh) 2010-09-08
DE502005006809D1 (de) 2009-04-23

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