EP1272754B1 - Procede de diagnostic de la commande de tension pour actionneur piezo-electrique d'une soupape d'injection - Google Patents

Procede de diagnostic de la commande de tension pour actionneur piezo-electrique d'une soupape d'injection Download PDF

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Publication number
EP1272754B1
EP1272754B1 EP01911413A EP01911413A EP1272754B1 EP 1272754 B1 EP1272754 B1 EP 1272754B1 EP 01911413 A EP01911413 A EP 01911413A EP 01911413 A EP01911413 A EP 01911413A EP 1272754 B1 EP1272754 B1 EP 1272754B1
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EP
European Patent Office
Prior art keywords
voltage
actuator
actuation
injection
reached
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 - Lifetime
Application number
EP01911413A
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German (de)
English (en)
Other versions
EP1272754A1 (fr
Inventor
Johannes-Joerg Rueger
Matthias Mrosik
Volker Pitzal
Udo Schulz
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 date
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Publication of EP1272754A1 publication Critical patent/EP1272754A1/fr
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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
    • F02D41/22—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
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems

Definitions

  • the invention is based on a method for diagnosing the Drive voltage for a piezoelectric actuator of a Injector according to the preamble of the main claim. It is already known, piezoelectrically driven injectors in particular to use for a common rail system. There is to initiate the injection process, the actuator with a corresponding voltage is driven, so that due its change in length a valve needle the injection channel for the injection process opens or closes. Since that Injection medium, in particular fuel for one Internal combustion engine is under high pressure is to highly accurate metering of the injection quantity an exact Opening and closing duration of the injector required.
  • the inventive method with the characterizing Advantages of the main claim has the advantage over that by forming a tolerance band for each control a simple monitoring of the drive process is possible. It is particularly advantageous that the tolerance bands below Consideration of system and injection conditions be set, so that by a plausibility check easily ascertainable, whether to the momentary Injection cycle the desired drive voltage prevailed Has.
  • injection systems with a multiple injection within a drive course cycle is advantageous in that in each phase of the injection the desired level of Control voltage is monitored. This ensures that that each injection pulse is monitored and errors easily be recognized.
  • the last selected drive voltage maintain, if it can be assumed that For example, the scheme does not work as desired.
  • An error that has occurred is advantageously stored so that he is traceable, for example, in the workshop and the corresponding component can be replaced.
  • FIG. 1 shows an injection valve with a double-switching control valve
  • Figure 2 shows a diagram with a drive characteristic
  • Figure 3 shows three Function diagrams
  • FIG. 4 shows a voltage diagram
  • FIG. 5 shows a block diagram for a voltage regulation
  • FIG. 6 shows a block diagram for a Gradient control.
  • FIG. 1 shows a schematic illustration Injector 1 with a central bore.
  • a control piston 3 with a piezoelectric actuator 2 introduced, wherein the actuating piston 3 with the actuator 2 fixed connected is.
  • the actuating piston 3 closes upwards a hydraulic coupler 4 off, while down a Opening with a connecting channel to a first seat.
  • 6 is provided, in which a piston 5 with a Closing member 12 is arranged.
  • the closure member 12 is designed as a double-closing control valve. It closes the first seat 6 when the actuator 2 in the resting phase is. Upon actuation of the actuator 2, d. H.
  • Each activation of the actuator 2 is the Control piston 3 in the direction of the hydraulic coupler. 4 emotional.
  • the piston 5 moves with the Closing member 12 toward the second seat 7 to.
  • About leak gaps is doing a part of the hydraulic Coupler 4 located medium, such as the Fuel, pushed out. Between two injections must Therefore, the hydraulic coupler 4 are refilled to to maintain its functional safety.
  • the Common rail system for example, between 200 and 1600 bar can amount.
  • This pressure acts against the nozzle needle eleventh and holds it against the pressure of a spring, not shown closed, so that no fuel can escape.
  • the pressure builds up in the high pressure area From and the nozzle needle 11 releases the injection channel.
  • a much lower pressure There is, for example, only 10% of the high pressure, is after the withdrawal of the drive voltage Ua of the hydraulic Coupler 4 refilled.
  • the diagram of Figure 2 shows a driving characteristic for the actuator 2.
  • Ua is the hub, d. H. the change in length of the actuator. 2 applied.
  • the actuator 2 has two closed positions. In the end position 1 the closure member 12 is applied to the first seat 6, if no Drive voltage Ua applied to the actuator 2. This position is marked 'bottom closed' or 'bottom'.
  • the second closed position in position 2 is reached when the Closing member on the second seat 7 is present. In this case is the highest drive voltage to spend Ua.
  • These Position is called 'top closed' or 'top'. Between these two positions 1, 2 are the Hysteresis curves a and b, respectively, depending on the Be traversed direction of movement.
  • FIG. 3 plots the injection parameters Vent, Ua and TR for a quadruple injection on an injection valve 1 over time t for three functional diagrams.
  • the upper diagram shows the injection duration for the injections E 1 , E 2 , E 3 and E 4 .
  • the designation 1 means that the valve Vent is open. At 0, the valve Vent is closed.
  • the injections may be pre, main and post injections for a single injection cycle on an injection valve. In a further embodiment of the invention, differently designed injection cycles are alternatively providable.
  • the middle diagram shows the drive voltage Ua for the actuator 2 to the individual injections, so that the injections E 1 ... E 4 can take place.
  • the lower diagram shows the triggering TR for the control of the drive voltage Ua at the corresponding times t 1 , t 2 for the first injection, t 3 , t 4 for the second injection, t 5 , t 6 for the third injection and t 7 , t 8 for the fourth injection.
  • the drive voltage Ua is different depending on the switching direction and the position of the closing member 12. For example, the drive voltage Ua between the times t 4 , t 5 is the highest.
  • a tolerance band B 1 , B 2 , B 3 , B 4 is formed.
  • This tolerance band is formed on the basis of operating parameters of the injection system, of the internal combustion engine or of environmental conditions. In a common rail system, it is for example the pressure (rail pressure), the temperature, engine speed, etc.
  • Corresponding control circuits are proposed in Figures 5 and 6 and will be explained later in more detail.
  • the control circuit provides a setpoint control voltage for the drive voltage Ua, which is required taking into account the individual parameters for controlling the actuator 2.
  • Corresponding tolerance bands B 1 to B 4 are preferably placed symmetrically around these setpoint values for the drive voltage Ua.
  • FIG. 4 again shows a multiple injection for an injection cycle, which proceeds as follows. Until the time t 1 , the drive voltage Ua is in the range of 0 V.
  • the tolerance band B 1 is set according to the voltage U bottom . This voltage corresponds to the position 1 according to the figure 2.
  • the Tolenanzband B 4 is provided for the voltage U Top for the second end position in position 2 ( Figure 2).
  • the tolerance band B 2 is still provided according to the voltage U down .
  • the times t 1 to t 6 represent the trigger points at which the voltage rises or falls. Before and after these times, in each case with an existing measuring device, which is preferably connected to the terminals of the actuator 2, the output voltage Ua measured and checked with an error device, whether the setpoint values for the drive voltages Ua were reached.
  • the actuator can be beneficial only via a diagnostic interface as part of a service be reset.
  • the error with each driving cycle to new identify can vary depending on the Application optionally be provided.
  • control operation in to go to the control mode when the regulation of Activation voltage no longer possible appears.
  • the last set Control voltage Ua or the controller outputs such as they are described to Figures 5 and 6, in a sense Freeze and continue to use.
  • FIG. 5 shows a block diagram for a regulation of the Voltage levels Ua in schematic form.
  • a subtractor 51 from the inputs a and b supplied nominal and actual values for the drive voltage Ua a difference value is formed.
  • This one is in one downstream comparator 52 with the voltage in the associated tolerance band B1 ... B4 (eg lower threshold S11, upper threshold S12).
  • the output is with connected to a Wegentpreller 58. Is the measured value in Range 0, then there is no error. If the value is 1, then there is an error and a corresponding one Control signal is given to the switch 56. simultaneously the difference value becomes a downstream controller 53 guided and a limit switch 54 the switch 56th fed.
  • the switch 56 can on the one hand the setpoint on the other hand, it is an adder 55 which supplies the offset value to the setpoint at terminal a added.
  • the output value is fed to a limiter 57, at an output c, the drive voltage Ua for the actuator 2 issues.
  • the switching takes place according to the invention then, if the difference value for a given number of Measured values outside the respective tolerance band.
  • the difference signal passes from the differentiating element 62 to a controller 64 and then via a Limit switch 65 on the switch 66. Similar to in Figure 5, the signal frozen or after link in Position 67 and 68 a limiter 69 for limiting the Current value for the actuator 2 are supplied. In addition will in position 67, the cylinder-specific gradient setpoint added. In position 68 can via an input c a Capacity value for the actuator 2 are entered. Of further inputs are f and g for the minimum / maximum of the Current limit 69 provided. At the output h is the Current value available.
  • the calculations are preferably always done for each Cylinder of the internal combustion engine individually, for optimum To get injection.

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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)

Claims (14)

  1. Procédé de diagnostic de la commande pour un actionneur piézoélectrique d'un injecteur, dans lequel une aiguille d'injecteur peut être amenée au moyen de l'actionneur dans une position « ouverte » ou une position « fermée », la tension de commande (Ua) de l'actionneur (2) étant mesurée au moyen d'un dispositif de mesure dans les différentes phases de commande,
    caractérisé en ce que
    pour chaque phase de commande une bande de tolérances (B1 ... B4) est fixée pour la tension de commande (Ua) et/ou le gradient de tension, la bande de tolérances (B1 ... B4) étant fixée en tenant compte de conditions de système et d'injection, et
    un diagnostic est effectué de telle sorte qu'un message d'erreur soit émis et/ou mémorisé lorsque la tension de commande et/ou le gradient de tension n'atteint pas la bande de tolérance (B1 ... B4) prédéterminée.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la tension de commande (Ua) est mesurée dans la zone des bornes d'actionneur (+, -).
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    pour une injection multiple avec un cycle d'évolution de commande, la tension de commande (Ua) est mesurée dans chaque phase du cycle d'évolution de commande.
  4. Procédé selon la revendication 3,
    caractérisé en ce que
    la valeur de consigne pour la tension de commande (Ua) est déterminée en fonction de la pression de conduite dans le système haute pression, et les bandes de tolérances (B1 ... B4) sont placées de préférence symétriquement autour des valeurs de consigne.
  5. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'injecteur (1) est conçu avec une soupape de commande (5) à double commutation, et les bandes de tolérances (B1 ... B4) sont formées pour les niveaux de tension « bas », « montant », « haut » et/ou « descendant ».
  6. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    si l'une des bandes de tolérances (B1 ... B4) prédéterminées n'est pas atteinte, l'actionneur (2) est déchargé pour passer dans un état sûr.
  7. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    lorsque l'on détecte que la bande de tolérances (B1 ... B4) prédéterminée n'est pas atteinte, les valeurs de mesure ne sont pas utilisées pour d'autres calculs.
  8. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    pour un nombre prédéterminé de cycles de mesure, on vérifie combien de fois la tension de commande (Ua) n'a pas atteint la bande de tolérances (B1 ... B4) prévue.
  9. Procédé selon la revendication 8,
    caractérisé en ce que
    lorsque le nombre prédéterminé de cycles de mesures est atteint, on commute de « réguler la tension de commande » sur « commander la tension de commande ».
  10. Procédé selon la revendication 8 ou 9,
    caractérisé en ce que
    lorsque le nombre prédéterminé de cycles de mesure est atteint, on coupe au moins l'actionneur (2) concerné.
  11. Procédé selon la revendication 8 ou 9,
    caractérisé en ce que
    lorsque le nombre prédéterminé de cycles de mesure est atteint, on conserve la dernière grandeur de sortie déterminée des régulateurs pour le niveau de tension et/ou le gradient.
  12. Procédé selon la revendication 8,
    caractérisé en ce que
    lorsque le nombre d'erreurs mesurées est inférieur à une valeur seuil prédéterminée, l'actionneur (2) est reconnu comme étant opérationnel.
  13. Procédé selon la revendication 12,
    caractérisé en ce que
    la mémoire d'erreurs est remise à zéro.
  14. Mise en oeuvre du procédé selon l'une quelconque des revendications précédentes pour un injecteur (1) dans un système à rampe commune d'un moteur de véhicule automobile.
EP01911413A 2000-04-01 2001-02-02 Procede de diagnostic de la commande de tension pour actionneur piezo-electrique d'une soupape d'injection Expired - Lifetime EP1272754B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10016476 2000-04-01
DE10016476A DE10016476A1 (de) 2000-04-01 2000-04-01 Verfahren zur Diagnose der Spannungsansteuerung für einen piezoelektrischen Aktor eines Einspritzventils
PCT/DE2001/000393 WO2001075289A1 (fr) 2000-04-01 2001-02-02 Procede de diagnostic de la commande de tension pour actionneur piezo-electrique d'une soupape d'injection

Publications (2)

Publication Number Publication Date
EP1272754A1 EP1272754A1 (fr) 2003-01-08
EP1272754B1 true EP1272754B1 (fr) 2005-11-02

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EP01911413A Expired - Lifetime EP1272754B1 (fr) 2000-04-01 2001-02-02 Procede de diagnostic de la commande de tension pour actionneur piezo-electrique d'une soupape d'injection

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Country Link
US (1) US6820474B2 (fr)
EP (1) EP1272754B1 (fr)
JP (1) JP2003529714A (fr)
DE (2) DE10016476A1 (fr)
ES (1) ES2248289T3 (fr)
WO (1) WO2001075289A1 (fr)

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Also Published As

Publication number Publication date
DE50107910D1 (de) 2005-12-08
US6820474B2 (en) 2004-11-23
JP2003529714A (ja) 2003-10-07
ES2248289T3 (es) 2006-03-16
EP1272754A1 (fr) 2003-01-08
WO2001075289A1 (fr) 2001-10-11
DE10016476A1 (de) 2001-12-06
US20040008032A1 (en) 2004-01-15

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