EP1423593B1 - Verfahren zum ansteuern eines piezobetriebenen kraftstoff-einspritzventils - Google Patents

Verfahren zum ansteuern eines piezobetriebenen kraftstoff-einspritzventils Download PDF

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Publication number
EP1423593B1
EP1423593B1 EP02760150A EP02760150A EP1423593B1 EP 1423593 B1 EP1423593 B1 EP 1423593B1 EP 02760150 A EP02760150 A EP 02760150A EP 02760150 A EP02760150 A EP 02760150A EP 1423593 B1 EP1423593 B1 EP 1423593B1
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EP
European Patent Office
Prior art keywords
injection
valve
timepoint
actuator
servo
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
EP02760150A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1423593A1 (de
Inventor
Dirk Baranowski
Hellmut Freudenberg
Christian Hoffmann
Wolfgang Lingl
Lorand Ouvenou
Richard Pirkl
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.)
Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1423593A1 publication Critical patent/EP1423593A1/de
Application granted granted Critical
Publication of EP1423593B1 publication Critical patent/EP1423593B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1413—Controller structures or design
    • F02D2041/143—Controller structures or design the control loop including a non-linear model or compensator
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
    • 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
    • F02D2041/2055—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit with means for determining actual opening or closing time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means

Definitions

  • the invention relates to a method for driving a piezo-operated fuel injection valve according to the features of claim 1.
  • the fuel injection process in diesel engines is usually carried out in several stages, with one or more pre- or post-injections being assigned to achieve a smoother combustion process of each main injection, in which the injected fuel quantity is small compared to the main injection quantity.
  • the piezo actuator actuates a hydraulic servo valve, which then moves the main valve.
  • the electrical control of the piezoelectric actuator is made so that the desired amount of fuel is injected.
  • the electrical control signals are designed in the injection of small amounts of fuel in terms of driving time and amplitude so that a safe injection takes place. Because of security concerns with respect to pressure fluctuations in the fuel supply line, parameter tolerances of the system and the wide operating temperature range is thus, especially in pre and post injections, a fuel quantity overdose connected. For this purpose, it has hitherto been concluded from the charge or energy fed into the piezoelectric actuator to the piezoelectric deflection.
  • the method according to the invention is based on a detection and evaluation of the length changes or forces of the piezoactuator which are determined from the electrical signals (of the current supplied to the piezoactuator and the voltage that builds up on it) on the piezoelectric actuator, with the aid of a nonlinear actuator model and an adaptive Method for evaluating the length changes on the piezoelectric actuator or the forces occurring on it.
  • the actuator model contains the non-linear relationships between charge or voltage and mechanical deflection, as well as operating point-dependent parameters. Furthermore, the actuator model takes into account the dielectric hysteresis of the piezoelectric actuator. Thus, this actuator model allows the conclusion of the electrical to the mechanical parameters and the simulation of the piezoelectric actuator in the range of pulse-shaped deflection.
  • FIG. 1 shows the basic course of the piezo stroke, ie, the change in length s of a piezoelectric actuator over time t during a driving process of a fuel injection valve.
  • This change in length s is calculated by means of the measured data of the current supplied to the piezoelectric actuator and the voltage which subsequently builds up on it with the aid of an actuator model which simulates the properties of a piezoactuator.
  • the curve s 1 shows the basic course of the beginning of the change in length s (expansion) of a piezoelectric actuator in a correct injection process.
  • the curve rises from the beginning 0 of the Control on, has a kink at a time t A and then increases faster, until it reaches a maximum and then drops again.
  • the kink is explained by the fact that the piezoactuator travels a free path before it penetrates against the force of the rail pressure in the servo valve and opens the servo valve.
  • the dashed curve s 0 shows the difference from the curve s 1, the basic course of the beginning of the change in length (expansion) of a piezoelectric actuator in an incorrect injection process.
  • the curve rises flat without having a kink, reaches a maximum and then falls off again, ie, the free travel is not completely measured.
  • the maximum of the curve of the linear expansion of a piezoelectric actuator depends inter alia on the energy that is supplied to the piezoelectric actuator: the greater the energy amount, the greater the longitudinal expansion s.
  • the beginning of the opening of the servo valve is thus approximately at the time t A of the curve s. 1
  • This opening of the servo valve is a mandatory requirement for a subsequent injection.
  • the actual injection is significantly delayed, since with the opening of the servo valve, the pressure in the valve chamber is slowly reduced and only then opens the actual injection valve.
  • the presence of the "bend" in the path is an indication that there is enough energy in the piezo for the servo valve to open.
  • the inventive method for determining this opening timing t A of the servo valve will be explained below.
  • the time t A for example, varies with the energy supplied to the piezoelectric actuator E and counteracting him Fuel rail pressure p and the actuator temperature T etc. He is so empirically known.
  • the times t1 to t4 which are stored in the maps and which determine the time windows W1 and W2 are also stored, that is, adapted, as a function of the time t A determined in the preceding previous injection process.
  • a determination of the injection duration is only made if a correct injection with a defined start of injection has previously been determined.
  • the fuel injection duration D is determined by means of the force F acting on the piezoactuator.
  • This force F is - as the change in length s - determined from the electrical signals (from the current supplied to the piezoelectric actuator and the voltage built up on it) with the aid of the aforementioned non-linear actuator model.
  • FIG. 2 a shows the basic profile of the force F 1 acting on a piezoelectric actuator during a fuel injection process or during a faulty injection (F 0 , dashed).
  • the force F increases from the beginning of the driving process and reaches its maximum at about time t A , then goes into an approximately horizontal course (in a faulty injection, it decreases slowly) and makes when switching off first a dip in the negative and then a jump into Positive, before it becomes zero again.
  • the first time derivative dF 1 / dt of the force F is used according to the invention.
  • the course of the first derivative dF 1 / dt of the force F (FIG. 2 a ) is shown schematically in FIG. 2 b.
  • this derivative dF 1 / dt reaches its maximum where the force F 1 rises steepest, then becomes negative when the force drops and reaches a plateau around the value zero where the force F 1 is horizontal. before it turns off at first negative and then positive and finally to zero.
  • a tolerance band for the value of the first derivative is applied in the area of the abovementioned plateau, with an upper value g1 (for dF / dt positive) and a lower value g2 (for dF / dt negative). Both values are shown in dashed lines in FIG. 2b.
  • These values like the windows W1 and W2 in FIG. 1, can also be determined via characteristic maps as a function of supplied energy, rail pressure and so on. be varied.

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)
EP02760150A 2001-09-05 2002-09-02 Verfahren zum ansteuern eines piezobetriebenen kraftstoff-einspritzventils Expired - Lifetime EP1423593B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10143501 2001-09-05
DE10143501A DE10143501C1 (de) 2001-09-05 2001-09-05 Verfahren zum Ansteuern eines piezobetriebenen Kraftstoff-Einspritzventils
PCT/DE2002/003226 WO2003023212A1 (de) 2001-09-05 2002-09-02 Verfahren zum ansteuern eines piezobetriebenen kraftstoff-einspritzventils

Publications (2)

Publication Number Publication Date
EP1423593A1 EP1423593A1 (de) 2004-06-02
EP1423593B1 true EP1423593B1 (de) 2006-11-02

Family

ID=7697798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02760150A Expired - Lifetime EP1423593B1 (de) 2001-09-05 2002-09-02 Verfahren zum ansteuern eines piezobetriebenen kraftstoff-einspritzventils

Country Status (5)

Country Link
US (1) US7040297B2 (ja)
EP (1) EP1423593B1 (ja)
JP (1) JP4047809B2 (ja)
DE (2) DE10143501C1 (ja)
WO (1) WO2003023212A1 (ja)

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DE10301822B4 (de) * 2003-01-20 2011-04-07 Robert Bosch Gmbh Verfahren zur Bestimmung der Längenausdehnung eines piezoelektrischen Aktors
DE10345226B4 (de) * 2003-09-29 2006-04-06 Volkswagen Mechatronic Gmbh & Co. Kg Verfahren und Vorrichtung zum Steuern eines Ventils und Verfahren und Vorrichtung zum Steuern einer Pumpe-Düse-Vorrichtung mit einem Ventil
DE10349307B3 (de) * 2003-10-23 2005-05-25 Siemens Ag Diagnoseverfahren für einen elektromechanischen Aktor
DE10357481A1 (de) * 2003-12-09 2005-07-14 Siemens Ag Betriebsverfahren für einen Aktor eines Einspritzventils
DE102004020937B4 (de) * 2004-04-28 2010-07-15 Continental Automotive Gmbh Verfahren zum Bestimmen einer Schließzeit eines Schließgliedes und Schaltungsanordnung
DE102004023545A1 (de) * 2004-05-13 2005-12-08 Daimlerchrysler Ag Verfahren zur Ermittlung der Position eines beweglichen Verschlusselementes eines Einspritzventils
DE102004029907A1 (de) * 2004-06-21 2006-02-02 Siemens Ag Verfahren und Datenverarbeitungsvorrichtung zum Simulieren eines Piezo-Aktuators und Computerprogramm
DE102004063294B4 (de) * 2004-12-29 2006-11-16 Siemens Ag Verfahren und Vorrichtung zum Steuern eines Einspritzventils
DE102005037361B4 (de) * 2005-08-08 2007-05-24 Siemens Ag Verfahren zur Ermittlung eines Ventilöffnungszeitpunkts
DE102005046743B3 (de) * 2005-09-29 2007-05-16 Siemens Ag Verfahren zur Ermittlung des Zeitpunktes des Anschlags eines Ventilkörpers in einem von einem elektromechanischen Aktor betätigten Ablaufventil
JP4475331B2 (ja) 2008-01-10 2010-06-09 株式会社デンソー 燃料噴射装置
DE102008023373B4 (de) * 2008-05-13 2010-04-08 Continental Automotive Gmbh Verfahren zum Steuern eines Einspritzventils, Kraftstoff-Einspritzanlage und Verbrennungsmotor
JP5284005B2 (ja) * 2008-08-25 2013-09-11 本田技研工業株式会社 圧電アクチュエータの制御方法
WO2011146907A2 (en) * 2010-05-20 2011-11-24 Cummins Intellectual Properties, Inc. Piezoelectric fuel injector system, method for estimating timing characteristics of a fuel injector event
DE102010039841B4 (de) * 2010-08-26 2014-01-09 Continental Automotive Gmbh Verfahren zum Anpassen der Einspritzcharakteristik eines Einspritzventils
DE102010041320B4 (de) * 2010-09-24 2021-06-24 Vitesco Technologies GmbH Bestimmung des Schließzeitpunkts eines Steuerventils eines indirekt angetriebenen Kraftstoffinjektors
DE102012204278A1 (de) * 2012-03-19 2013-09-19 Continental Automotive Gmbh Verfahren zum Betreiben eines Kraftstoffeinspritzsystems und Kraftstoffeinspritzsystem mit Einspritzventil mit Regelung der Bewegung des Verschlusselementes
DE102012204272B4 (de) * 2012-03-19 2021-10-28 Vitesco Technologies GmbH Verfahren zum Betreiben eines Kraftstoffeinspritzsystems mit Regelung des Einspritzventils zur Erhöhung der Mengengenauigkeit und Kraftstoffeinspritzsystem
DE102013223750B3 (de) 2013-11-21 2015-02-19 Continental Automotive Gmbh Verfahren zur Bestimmung des Ventilöffnungszeitpunktes bei piezoservobetriebenen Injektoren
DE102013226849B3 (de) 2013-12-20 2015-04-30 Continental Automotive Gmbh Verfahren zum Betreiben eines Einspritzventils
DE102014212377B4 (de) * 2014-06-27 2016-07-21 Continental Automotive Gmbh Verfahren zur Bestimmung eines Zustandes eines Einspritzventils
DE102015206286B4 (de) * 2015-04-09 2019-05-29 Continental Automotive Gmbh Verfahren und Vorrichtung zum Betreiben eines Injektors

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Also Published As

Publication number Publication date
JP4047809B2 (ja) 2008-02-13
EP1423593A1 (de) 2004-06-02
DE50208611D1 (de) 2006-12-14
DE10143501C1 (de) 2003-05-28
US20050072854A1 (en) 2005-04-07
WO2003023212A1 (de) 2003-03-20
US7040297B2 (en) 2006-05-09
JP2005501999A (ja) 2005-01-20

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