EP1439297A2 - Procédé de détermination de l'allongement d'un actionneur piezo-électrique - Google Patents

Procédé de détermination de l'allongement d'un actionneur piezo-électrique Download PDF

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Publication number
EP1439297A2
EP1439297A2 EP03104715A EP03104715A EP1439297A2 EP 1439297 A2 EP1439297 A2 EP 1439297A2 EP 03104715 A EP03104715 A EP 03104715A EP 03104715 A EP03104715 A EP 03104715A EP 1439297 A2 EP1439297 A2 EP 1439297A2
Authority
EP
European Patent Office
Prior art keywords
actuator
force
linear expansion
schwell
acting
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.)
Withdrawn
Application number
EP03104715A
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German (de)
English (en)
Other versions
EP1439297A3 (fr
Inventor
Johannes-Joerg Rueger
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 EP1439297A2 publication Critical patent/EP1439297A2/fr
Publication of EP1439297A3 publication Critical patent/EP1439297A3/fr
Withdrawn legal-status Critical Current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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
    • 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
    • F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
    • F02D2041/2013—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening by using a boost voltage source
    • 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
    • F02D2041/2024—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
    • 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
    • F02D2041/2034—Control of the current gradient
    • 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

Definitions

  • the invention relates to a method for determining the linear expansion of a piezoelectric Actuator of an injection valve of an internal combustion engine of the type of the main claim.
  • 32 802 A1 is an injection valve for the Fuel injection into the combustion chamber of an internal combustion engine with a High-pressure system (common rail system) known.
  • This injector has two Valve seats against which a valve closing element is actuated by a piezo actuator is moved.
  • the valve closing member is initially in a closed position on the first valve seat, it can be moved to an intermediate position using the piezo actuator between the valve seats and then into a second closed position on the second Valve seat.
  • the piezoelectric actuator is set to a control voltage loaded, which depends on the pressure in the common rail system. Because of the created The actuator expands tension in the longitudinal direction and thereby moves the closing element towards the second valve seat. To reverse the movement of the valve closing member the actuator is discharged in the direction of the first valve seat.
  • valve closing member Due to the movement of the valve closing member from one valve seat to the other is a short-term relief of a high pressure valve control room reached, via the pressure level the control of a valve needle in an opening or Closed position.
  • the valve closing member is in an intermediate position A fuel injection takes place between the two valve seats. In this way can also be fueled twice by a single charge and discharge, e.g. a pre-injection and a main injection can be realized.
  • the control the valve member is done in these injectors by means of a hydraulic ratio in a hydraulic coupler.
  • the piezoelectric actuator is charged to a certain voltage.
  • the elongation of the actuator associated with a high force depends approximately linearly from the applied voltage.
  • a proper functioning of a fuel injection system actuated with piezoelectric actuators now depends significantly on the linear expansion of the piezoelectric actuators. The same applies for the force acting on or exerted by the actuator. It is now problematic the linear expansion as well as that acting on the actuator or that of to determine this exerted force.
  • the invention is therefore based on the object of conveying a method which with reasonable effort a determination of the linear expansion of the actuators and to determine the force exerted by it.
  • This task is accomplished by a method for determining the linear expansion of a Piezoelectric actuator of an injection valve with the features of claim 1 solved.
  • the inventive method for determining the linear expansion of a Piezoelectric actuator of an injection valve has the advantage that the linear expansion of the actuator and the force acting on it can be determined without additional sensors are required for this.
  • the detection of the actuator voltage as well the actuator is charged anyway, e.g. for voltage regulation or determination the temperature prevailing at the actuator.
  • the measures listed in the dependent claims are advantageous Developments and improvements to the method specified in the main claim possible.
  • the length extension and the one acting on the actuator are thus advantageous Force compared with predefinable threshold values and then when the determined Force from the threshold for the force and the determined linear expansion of that Threshold for the linear expansion deviate due to a malfunction of the injection valve closed.
  • Such a malfunction can occur, for example, with a hydraulic coupler having injection valve when the hydraulic coupler is insufficient is filled.
  • the hydraulic coupler is malfunctioning when the force acting on the actuator is smaller than the threshold value for the force and at the same time the linear expansion of the actuator is greater than the threshold value for the linear expansion of the actuator.
  • the voltage and the amount of charge applied to the actuator preferably determined immediately before the actuator is discharged. For this, for example checked whether there is a discharge command in an engine control unit. If this if so, the voltage and charge are measured.
  • the charge is preferably determined by integrating the charge current.
  • FIG. 1 shows a schematic illustration of an injection valve known from the prior art 1 with a central hole.
  • an adjusting piston 3 with a piezoelectric actuator 2 is introduced into the central bore, the actuating piston 3 is firmly connected to the actuator 2.
  • the actuating piston 3 closes a hydraulic one at the top Coupler 4 off while opening an opening with a connecting channel to a first seat 6 is provided, in which a piston 5 with a valve closing member 12 is arranged.
  • the valve closing member 12 is a double closing control valve educated. It closes the first seat 6 when the actuator 2 is at rest.
  • the actuator 2 When actuated of the actuator 2, that is to say when a control voltage Ua is applied to the terminals +, -, the actuator 2 actuates the actuating piston 3 and presses the hydraulic one Coupler 4 the piston 5 with the closing member 12 in the direction of a second seat 7.
  • a nozzle needle 11 Below the second seat is a nozzle needle 11 in a corresponding channel arranged, which closes the outlet in a high-pressure channel (common rail pressure) 13 or opens, depending on which control voltage Ua is present.
  • the high pressure will through the medium to be injected, for example fuel for an internal combustion engine, fed via an inlet 9, via an inlet throttle 8 and an outlet throttle 10 is the inflow amount of the medium in the direction of the nozzle needle 11 and the hydraulic Coupler 4 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 the control valve from the static Decouple thermal expansion of the actuator 2. The refilling of the Coupler 4 is not shown here.
  • P 1 denotes the so-called coupler pressure as measured in the hydraulic coupler 4. Without control Ua, a stationary pressure P 1 is set in the coupler, which is, for example, 1/10 of the pressure in the high-pressure part. After the actuator 2 has been discharged, the coupler pressure P 1 is approximately 0 and is raised again by refilling.
  • the subject of the present invention is now the elongation of the actuator 2 and thus estimate the force F acting on it without additional sensor means use.
  • the invention takes advantage of the fact that the actuator 2 can be characterized by the two parameters of voltage and applied amount of charge.
  • the actuator is first charged to a target voltage U 1 and then electrically isolated (point P1).
  • a certain amount of charge Q is thus applied to the actuator 2, which no longer changes in the second phase, that is to say remains constant.
  • the actuator 2 is exposed to changing forces, for example in that the hydraulic coupler 4 empties to a certain extent due to the leakage gaps and thus the force F on the actuator 2 decreases, so that the voltage Ua at the actuator 2 does not remain constant, but instead usually drops to a value U 2 (point P2) due to the backward forces on actuator 2.
  • U 2 point P2
  • step S 10 An exemplary embodiment of a method according to the invention is described below with Figures 3, 4 and 5 explained in more detail.
  • step S 10 a load command is issued.
  • the charging current is integrated in a step S15. It is then in step S20 checked whether a target voltage has been reached. If this is not the case, the charging current further integrated. When the target voltage is reached, the charging process and the integration ends in step S25.
  • step S30 a wait for an unload command. Whether such an unload command is present is determined in step S35 checked. If it is not present, the system continues to wait (step S30). If it is against a predeterminable time t1 before the new discharge is applied to the actuator 2 The voltage U and the charge Q are measured (step S40). Calculating the on that Control valve acting force and the actuator expansion from the measured values of the Voltage U and the charge Q take place in step S45. Then in step S50 Evaluation of the values for the force F_x and the stroke s_x made the following is described in more detail in connection with FIG. 5.
  • the actuator stroke s_x determined in this way is assigned a threshold value for the actuator stroke s_schwell compared. Furthermore, in a circuit unit 80 the value of the force F_x acting on the valve with a threshold value for the Force F_schwell compared, it is checked whether the force acting on the valve F_x is less than the threshold value for the force F_schwell. If both the on the valve acting force F_x is less than the threshold value for the force F_schwell and the actuator stroke s_x is greater than the threshold value for the actuator stroke s_schwell, which in one Circuit unit 90 is checked, an error message is output, for example the error message that the hydraulic coupler 4 is insufficiently filled.

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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)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
EP03104715A 2003-01-20 2003-12-16 Procédé de détermination de l'allongement d'un actionneur piezo-électrique Withdrawn EP1439297A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003101822 DE10301822B4 (de) 2003-01-20 2003-01-20 Verfahren zur Bestimmung der Längenausdehnung eines piezoelektrischen Aktors
DE10301822 2003-01-20

Publications (2)

Publication Number Publication Date
EP1439297A2 true EP1439297A2 (fr) 2004-07-21
EP1439297A3 EP1439297A3 (fr) 2005-12-07

Family

ID=32520029

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EP03104715A Withdrawn EP1439297A3 (fr) 2003-01-20 2003-12-16 Procédé de détermination de l'allongement d'un actionneur piezo-électrique

Country Status (2)

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EP (1) EP1439297A3 (fr)
DE (1) DE10301822B4 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012210735B4 (de) * 2012-06-25 2020-02-06 Robert Bosch Gmbh Verfahren und Vorrichtung zur Ansteuerung eines Kraftstoffeinspritzventils
DE102013223750B3 (de) 2013-11-21 2015-02-19 Continental Automotive Gmbh Verfahren zur Bestimmung des Ventilöffnungszeitpunktes bei piezoservobetriebenen Injektoren

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0464443A1 (fr) * 1990-06-18 1992-01-08 Toyota Jidosha Kabushiki Kaisha Dispositif de commande pour un élément piézoélectrique
JPH06177449A (ja) * 1992-12-04 1994-06-24 Toyota Motor Corp 圧電素子駆動回路
EP0611881A1 (fr) * 1993-01-19 1994-08-24 Aisin Seiki Kabushiki Kaisha Dispositif pour régler l'injection de carburant pour moteur à combustion interne
JPH07107753A (ja) * 1993-09-29 1995-04-21 Toyota Motor Corp 圧電素子駆動装置
DE19732802A1 (de) * 1997-07-30 1999-02-04 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE19827052A1 (de) * 1998-06-18 1999-12-23 Bosch Gmbh Robert Verfahren und Vorrichtung zum Steuern eines piezoelektrischen Elements auf eine wunschgemäße Ausdehnung
DE10032022A1 (de) * 2000-07-01 2002-01-10 Bosch Gmbh Robert Verfahren und Bestimmung der Ansteuerspannung für ein Einspritzentil mit einem piezoelektrischen Aktor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10143501C1 (de) * 2001-09-05 2003-05-28 Siemens Ag Verfahren zum Ansteuern eines piezobetriebenen Kraftstoff-Einspritzventils

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0464443A1 (fr) * 1990-06-18 1992-01-08 Toyota Jidosha Kabushiki Kaisha Dispositif de commande pour un élément piézoélectrique
JPH06177449A (ja) * 1992-12-04 1994-06-24 Toyota Motor Corp 圧電素子駆動回路
EP0611881A1 (fr) * 1993-01-19 1994-08-24 Aisin Seiki Kabushiki Kaisha Dispositif pour régler l'injection de carburant pour moteur à combustion interne
JPH07107753A (ja) * 1993-09-29 1995-04-21 Toyota Motor Corp 圧電素子駆動装置
DE19732802A1 (de) * 1997-07-30 1999-02-04 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE19827052A1 (de) * 1998-06-18 1999-12-23 Bosch Gmbh Robert Verfahren und Vorrichtung zum Steuern eines piezoelektrischen Elements auf eine wunschgemäße Ausdehnung
DE10032022A1 (de) * 2000-07-01 2002-01-10 Bosch Gmbh Robert Verfahren und Bestimmung der Ansteuerspannung für ein Einspritzentil mit einem piezoelektrischen Aktor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN Bd. 018, Nr. 507 (E-1609), 22. September 1994 (1994-09-22) & JP 06 177449 A (TOYOTA MOTOR CORP), 24. Juni 1994 (1994-06-24) *
PATENT ABSTRACTS OF JAPAN Bd. 1995, Nr. 07, 31. August 1995 (1995-08-31) & JP 07 107753 A (TOYOTA MOTOR CORP), 21. April 1995 (1995-04-21) *

Also Published As

Publication number Publication date
EP1439297A3 (fr) 2005-12-07
DE10301822A1 (de) 2004-07-29
DE10301822B4 (de) 2011-04-07

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