WO2010023041A1 - Procédé de fonctionnement d'un dispositif d'injection de carburant pour un moteur à combustion interne - Google Patents

Procédé de fonctionnement d'un dispositif d'injection de carburant pour un moteur à combustion interne Download PDF

Info

Publication number
WO2010023041A1
WO2010023041A1 PCT/EP2009/059433 EP2009059433W WO2010023041A1 WO 2010023041 A1 WO2010023041 A1 WO 2010023041A1 EP 2009059433 W EP2009059433 W EP 2009059433W WO 2010023041 A1 WO2010023041 A1 WO 2010023041A1
Authority
WO
WIPO (PCT)
Prior art keywords
time
valve
piezoelectric element
voltage
injection device
Prior art date
Application number
PCT/EP2009/059433
Other languages
German (de)
English (en)
Inventor
Hans-Peter Lehr
Erik Tonner
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 WO2010023041A1 publication Critical patent/WO2010023041A1/fr

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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • 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 is based on a method for operating a
  • Fuel injection device of an internal combustion engine in particular an internal combustion engine of a motor vehicle, according to the features of the preamble in claim 1.
  • the invention also relates to a corresponding computer program, an electrical memory and a control device.
  • the invention is based, even for injectors in which the nozzle needle is controlled by a valve, to provide a method which allows the monitoring of the state of the control valve, the task.
  • This object is achieved by a method for operating a fuel injection device, in particular a motor vehicle with an injection valve, wherein the injection valve comprises a piezoelectric element and a control valve with a valve member and a valve seat, achieved in that the piezoelectric element is charged, and that of the the second time derivative is formed on the piezoelectric element during the charging process and that the time at which the second time derivative of the voltage has a maximum is considered as corresponding to the time of impact of the valve member on the valve seat size.
  • the invention is based on the finding that a measure of the state of the injection device or of the control valve can be obtained from the evaluation of the voltage profile.
  • the state of the injector and with it also the switching time of the control valve is subject to aging and wear-related changes over the life of an internal combustion engine.
  • the inventive method determines the time at which a valve member of the control valve impinges on the valve seat. From this, the switching time of the control valve can be determined. Since this switching time for the optimal control or fuel metering in the combustion chamber of the internal combustion engine is of considerable importance, this switching time can be detected periodically using the inventive method over the entire life of the internal combustion engine and in the calculation of the driving time and the driving times of the piezoelectric element of the fuel injection device be considered accordingly.
  • a delay time constant which is between the impact of the valve member on the valve seat and the occurrence of the maximum of the second time derivative of the voltage applied to the piezoelectric element taken into account.
  • This delay time ⁇ T is essentially determined by the mechanical properties, in particular mass inertia and dimensions of the coupler, and therefore almost constant over the entire life of the fuel injector. Therefore, it is possible without significant effort to take into account this size in the calculation of the switching time of the control valve and thereby determine the switching even more accurate even more accurate.
  • the opening time of the nozzle needle changes. As a result, there may also be changes in the amount of fuel injected. These changes can be made by changing the injection durations during the performance of the invention
  • the method according to the invention is above all suitable for detecting the drift of the piezoelectric element, aging and wear phenomena of the fuel injection in general, but in particular of the control valve, and it is only these changes that take effect over many operating hours sufficient to perform the inventive method periodically, that is, for example, after a predetermined number of several hours of operation and by the obtained values for the switching time of the control valve or the time of impact of the valve member on the valve seat to use accordingly in the control of the internal combustion engine.
  • the aforementioned object is also achieved by a computer program, an electrical memory on which a computer program is stored, and a control device for an internal combustion engine, which is prepared for carrying out a method according to one of claims 1 to 8.
  • Figure 1 is a suitable for carrying out the method according to the invention fuel injection device
  • FIG. 2 shows the control of an injector in normal operation
  • Figures 3 and 4 are diagrams, based on which the inventive evaluation of the voltage of the piezoelectric element is shown and explained.
  • the injection valve 1 according to FIG. 1 has a piezoelectric element 2 which comprises a multiplicity of piezoelectrically active layers 4 connected in series.
  • the piezoelectric element 2 is driven via terminals 7 by a control unit, not shown.
  • the piezoelectric element 2 is connected on the one hand with a housing wall 6 and on the other hand with a control piston 8 frictionally.
  • the actuating piston 8 terminates with its element 2 facing away from the end face 9 from a hydraulic coupler 10.
  • the hydraulic coupler 10 in turn acts on a guided in a connecting channel 12 actuator piston 14, at its end facing away from the coupler 10 a control valve 15 shown a valve member 16 is arranged.
  • the exemplary control valve 15 shown in Figure 1 is designed as a double-closing control valve. However, the invention is not limited to injection valves with double-closing control valves 15.
  • valve member 16 In the illustrated position, which corresponds to a rest position of the element 2, the valve member 16 closes a first valve seat 18 of a valve chamber 20. In a second closed position, which corresponds to a maximum actuation of the actuator 2, the valve member 16 closes a second valve seat 22 of the valve chamber 20th
  • valve chamber 20 Via an opening in the second valve seat 22, the valve chamber 20 is connected to a guide channel 24, which is connected on the input side via a connecting piece 26 to a pressure channel, not shown, of a common rail fuel supply system of a motor vehicle.
  • the injection valve 1 can also be part of a fuel supply system with individual pressure generation and supply of the injection nozzles.
  • a nozzle needle 28 is arranged, which releases or closes a fuel outlet 30 of a branched off from the connecting piece 26 fuel passage 32 depending on a voltage applied to the element 2 via the terminals 7 drive voltage.
  • the connecting piece 26 with an inlet throttle 34 and the guide channel 24 are provided with an outlet throttle 36.
  • the element 2 of the injection valve 1 expands in its longitudinal direction, so that the actuating piston 8 moves in the direction of the hydraulic coupler 10.
  • the actuating piston 14 with the valve member 16 arranged thereon also moves in the direction of the second valve seat 22.
  • a high pressure which may be for example between 200 and 1800 bar in a common rail system.
  • This pressure acts against the nozzle needle 28 and keeps it closed, so that no fuel can escape through the fuel outlet 30.
  • the valve member 16 is now moved from the first valve seat 18 to the second valve seat 22 or vice versa due to the voltage applied to the element 2, then the pressure in the high pressure region of the guide channel 24 decreases, so that the nozzle needle 28 in the direction of the valve chamber 20th recedes and releases the fuel outlet 30. In this case, fuel injection takes place in an associated cylinder.
  • the method described below for detecting the impingement of the valve member 16 on the second valve seat 22 is otherwise limited in any way to the injector 1 described above, but rather can also be used in alternatively designed injection valves.
  • the drive voltage U is plotted in volts over time t.
  • a first line 40 shows the time profile of the current I, which is used for loading and unloading the piezoelectric element 2 (see FIG. 1).
  • This charging time is indicated in FIG. 2 by LZ.
  • a second line 42 shows the course of the voltage applied to the piezoelectric element 2 electrical voltage U. It can be seen that during the loading process in the period ti to t ⁇ the voltage U increases sharply.
  • the voltage curve is also characterized during the loading process in that the slope of the voltage is continuously decreasing from a very high level. Kinks or other discontinuities can not be detected in the course of the tension during the loading process.
  • a third line 44 shows the stroke of the piezoelectric element 2 in FIG.
  • the stroke of the valve member 16 of the control valve 15 is represented by a fourth line 46.
  • a fifth line 48 indicates the pressure in the coupler compartment 10. With another line 50, the stroke of the nozzle needle 28 is plotted over time.
  • FIG. 4 shows a detail of FIG. 3 enlarged in order to better recognize the highly dynamic processes during the charging process.
  • the numbering of the different lines in Figures 2, 3 and 4 are the same.
  • the piezoelectric element 2 When the piezoelectric element 2 is charged, it performs a lifting movement (see the line 44). As a result, the valve member 16 of the double-closing control valve 15 also performs a stroke (see the line 46). It moves from its rest position and moves to the valve seat 22. The stroke of the valve member 16 is slightly delayed relative to the stroke of the piezoelectric element 2.
  • the pressure increase can be, for example, 150 bar.
  • This increased pressure in the coupler space 10 leads to a corresponding hydraulic force which acts on the piezoelectric element 2.
  • This force leads to a change in length of the piezoelectric element 2.
  • a first local maximum 52 in the line 44 is shown by way of example for such a pressure-induced change in length of the piezoelectric element 2. Due to the piezoelectric effect, the compression of the piezoelectric leads Element 2 also to a kink in the voltage curve at the piezoelectric element 2 (see reference numeral 54 in Figure 4).
  • Derivation of the voltage curve can also be easily determined internally by the control unit, can easily and accurately determine the time ⁇ in the manner just described invention.
  • Delay time ⁇ T ⁇ t 3 - X 2 . Since this delay time .DELTA.T is a constant quantity, it is sufficient to detect this once in a pattern in series manufactured injector and deposit as a constant value in the control unit. Then it is possible, after the determination of the time t 3, also to calculate the time t 2 with the following equation:
  • the switching time of the control valve 15 is determined by the time difference t 2 - ti.
  • the knowledge of this switching time SZ is essential for the precise control of a fuel injection device, since only then the fuel metering can be done with the required precision.
  • the switching time SZ can change in the course of one of many thousands of operating hours due to wear, drift of the piezoelectric element 2 or other external influences, it is possible with the aid of the inventive method, the switching time SZ or the time t 2 periodically during the entire To record life of the internal combustion engine and store any changes occurring in the switching time or the time T2 in the control unit. These changed values can then be used as the basis for the subsequent calculations of the control or injection of the control of the fuel injection device, so that the quality of the control is independent of the drift and the wear within the fuel injection device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne un procédé de fonctionnement d'un dispositif d'injection de carburant pour moteur à combustion interne, comprenant une soupape d'injection (1) qui présente un élément piézoélectrique (2) et une soupape de commande (15) dotée d'un organe de soupape (16) et d'au moins un siège de soupape (22). Pendant le chargement de l'élément piézoélectrique (2), la tension électrique appliquée à l'élément piézoélectrique (2) est mesurée et analysée. De ce fait, il est possible de détecter périodiquement, pendant toute la durée de vie du moteur à combustion interne, une dérive de l'élément piézoélectrique (2) se produisant éventuellement et/ou des phénomènes d'usure de la soupape de commande (15), et d'en tenir compte dans le calcul des temps de commande du dispositif d'injection de carburant (1).
PCT/EP2009/059433 2008-08-25 2009-07-22 Procédé de fonctionnement d'un dispositif d'injection de carburant pour un moteur à combustion interne WO2010023041A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810041527 DE102008041527A1 (de) 2008-08-25 2008-08-25 Verfahren zum Betreiben einer Kraftstoffeinspritzvorrichtung einer Brennkraftmaschine
DE102008041527.8 2008-08-25

Publications (1)

Publication Number Publication Date
WO2010023041A1 true WO2010023041A1 (fr) 2010-03-04

Family

ID=41226826

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/059433 WO2010023041A1 (fr) 2008-08-25 2009-07-22 Procédé de fonctionnement d'un dispositif d'injection de carburant pour un moteur à combustion interne

Country Status (2)

Country Link
DE (1) DE102008041527A1 (fr)
WO (1) WO2010023041A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170074197A1 (en) * 2014-05-23 2017-03-16 Continental Automotive Gmbh Method for determining the closing characteristic of the control valve of a piezo servo injector
WO2017178140A1 (fr) * 2016-04-15 2017-10-19 Continental Automotive Gmbh Procédé de détermination du moment de fermeture d'une servosoupape dans le cas d'injecteurs à propulsion piézo-électrique et système d'injection de carburant

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010014208A1 (de) * 2010-04-08 2011-10-13 Continental Automotive Gmbh Verfahren und Vorrichtung zum Betreiben eines Einspritzventils
DE102012216454A1 (de) 2012-09-14 2014-03-20 Robert Bosch Gmbh Verfahren und Vorrichtung zum Laden eines piezoelektrischen Aktuators
DE102012222851B4 (de) 2012-12-12 2021-12-02 Robert Bosch Gmbh Verfahren zur Kontrolle eines Piezo-Injektors

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19930309A1 (de) * 1999-07-01 2001-01-11 Siemens Ag Verfahren und Vorrichtung zur Regelung der Einspritzmenge bei einem Kraftstoffeinspritzventil mit Piezoelement-Aktor
EP1172541A1 (fr) * 2000-07-01 2002-01-16 Robert Bosch GmbH Actionneur piézo-électrique pour système d'injection
EP1519026A2 (fr) * 2003-09-29 2005-03-30 VW Mechatronic GmbH & Co. KG Méthode et dispositif de commande d'une soupape et méthode et dispositif de commande d'une pompe-injecteur avec soupape
EP1561937A1 (fr) * 2004-02-09 2005-08-10 Siemens Aktiengesellschaft Procédé de command d'un injecteur de moteur à combustion interne
DE102006058742A1 (de) * 2006-12-12 2008-06-19 Robert Bosch Gmbh Verfahren zum Betreiben eines Kraftstoffeinspritzventils

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19930309A1 (de) * 1999-07-01 2001-01-11 Siemens Ag Verfahren und Vorrichtung zur Regelung der Einspritzmenge bei einem Kraftstoffeinspritzventil mit Piezoelement-Aktor
EP1172541A1 (fr) * 2000-07-01 2002-01-16 Robert Bosch GmbH Actionneur piézo-électrique pour système d'injection
EP1519026A2 (fr) * 2003-09-29 2005-03-30 VW Mechatronic GmbH & Co. KG Méthode et dispositif de commande d'une soupape et méthode et dispositif de commande d'une pompe-injecteur avec soupape
EP1561937A1 (fr) * 2004-02-09 2005-08-10 Siemens Aktiengesellschaft Procédé de command d'un injecteur de moteur à combustion interne
DE102006058742A1 (de) * 2006-12-12 2008-06-19 Robert Bosch Gmbh Verfahren zum Betreiben eines Kraftstoffeinspritzventils

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170074197A1 (en) * 2014-05-23 2017-03-16 Continental Automotive Gmbh Method for determining the closing characteristic of the control valve of a piezo servo injector
WO2017178140A1 (fr) * 2016-04-15 2017-10-19 Continental Automotive Gmbh Procédé de détermination du moment de fermeture d'une servosoupape dans le cas d'injecteurs à propulsion piézo-électrique et système d'injection de carburant
KR20180120758A (ko) * 2016-04-15 2018-11-06 콘티넨탈 오토모티브 게엠베하 압전-구동식 분사기의 서보 밸브의 폐쇄 시간을 확인하기 위한 방법 및 연료 분사 시스템
CN108884771A (zh) * 2016-04-15 2018-11-23 大陆汽车有限公司 用于确定压电驱动的喷射器中的伺服阀关闭时间的方法以及燃料喷射***
US10557432B2 (en) 2016-04-15 2020-02-11 Continental Automotive Gmbh Fuel injection systems
KR102117185B1 (ko) 2016-04-15 2020-06-02 콘티넨탈 오토모티브 게엠베하 압전-구동식 분사기의 서보 밸브의 폐쇄 시간을 확인하기 위한 방법 및 연료 분사 시스템

Also Published As

Publication number Publication date
DE102008041527A1 (de) 2010-03-04

Similar Documents

Publication Publication Date Title
DE102011005285B4 (de) Verfahren zur Bestimmung des Leerhubes eines Piezoinjektors mit direkt betätigter Düsennadel
DE102006059070A1 (de) Kraftstoffeinspritzsystem und Verfahren zum Ermitteln eines Nadelhubanschlags in einem Kraftstoffeinspritzventil
DE102010021168B4 (de) Verfahren zum Betreiben einer Brennkraftmaschine und Brennkraftmaschine
DE102009018289B3 (de) Verfahren und Vorrichtung zum Betreiben eines Einspritzventils
EP1828582B1 (fr) Procede et dispositif de compensation des effets de rebond dans un systeme d'injection a commande piezo-electrique d'un moteur a combustion interne
DE102006003861A1 (de) Verfahren zum Betreiben einer Kraftstoffeinspritzvorrichtung, insbesondere eines Kraftfahrzeugs
DE102005002242A1 (de) Verfahren zum Betreiben einer Kraftstoff-Einspritzvorrichtung einer Brennkraftmaschine
WO2012126736A1 (fr) Procédé de détermination des rapports de forces sur l'aiguille de la buse d'un injecteur piézoélectrique à actionnement direct
DE102011003751A1 (de) Einspritzvorrichtung
WO2010023041A1 (fr) Procédé de fonctionnement d'un dispositif d'injection de carburant pour un moteur à combustion interne
WO2011154124A1 (fr) Procédé et dispositif servant à faire fonctionner une soupape d'injection
EP1551065B1 (fr) Procédé et appareil de détermination de la tension de commande d'un actionneur piézoélectrique d'une soupape d'injection
DE102006011725A1 (de) Verfahren und Vorrichtung zum Kalibrieren eines Piezo-Aktuators
AT503441B1 (de) Vorrichtung zum ansteuern wenigstens eines piezoelektrischen stelltriebes einer einspritzdüse für eine brennkraftmaschine
DE10228063A1 (de) Verfahren zum Betreiben einer Brennkraftmaschine insbesondere eines Kraftfahrzeugs
DE102006055259A1 (de) Kraftstoffeinspritzsystem und Verfahren zum Ermitteln einer über ein Kraftstoffeinspritzventil eingespritzten Kraftstoffmenge
DE102007059115B4 (de) Verfahren zum Betreiben eines piezoelektrischen Aktors
DE102007058540B4 (de) Verfahren und Vorrichtung zum Laden und Entladen eines piezoelektrischen Elements
DE102012204253B4 (de) Verfahren zum Betreiben eines Kraftstoffeinspritzsystems mit Einspritzventil mit Piezo-Servobetrieb mit Raildruckermittlung und Kraftstoffeinspritzsystem
DE102007061946A1 (de) Verfahren zum Betreiben einer Kraftstoff-Einspritzvorrichtung
DE102007048609B4 (de) Verfahren zur Erfassung des Betriebsdrucks eines Piezoinjektors einer Brennkraftmaschine
WO2004003365A1 (fr) Procede, programme informatique, dispositif de commande et/ou de regulation pour faire fonctionner un moteur a combustion interne
DE102009045867A1 (de) Verfahren zum Bestimmen einer Einspritzdauer
WO2024088704A1 (fr) Procédé de détermination d'un ou de plusieurs temps caractéristiques d'une injection de carburant
DE102004053349A1 (de) Verfahren und Vorrichtung zur Ansteuerung eines Kraftstoffinjektors einer Brennkraftmaschine

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09780932

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 09780932

Country of ref document: EP

Kind code of ref document: A1