EP2443333B1 - Détermination du retard de levage d'une électrovanne - Google Patents

Détermination du retard de levage d'une électrovanne Download PDF

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Publication number
EP2443333B1
EP2443333B1 EP10720182.4A EP10720182A EP2443333B1 EP 2443333 B1 EP2443333 B1 EP 2443333B1 EP 10720182 A EP10720182 A EP 10720182A EP 2443333 B1 EP2443333 B1 EP 2443333B1
Authority
EP
European Patent Office
Prior art keywords
magnetic valve
actuation
measurement phase
opening
opening time
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.)
Not-in-force
Application number
EP10720182.4A
Other languages
German (de)
English (en)
Other versions
EP2443333A1 (fr
Inventor
Klaus Joos
Ruben Schlueter
Jens Neuberg
Helerson Kemmer
Hans-Peter Lehr
Holger Rapp
Haris Hamedovic
Joerg Koenig
Anh-Tuan Hoang
Bernd Wichert
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 EP2443333A1 publication Critical patent/EP2443333A1/fr
Application granted granted Critical
Publication of EP2443333B1 publication Critical patent/EP2443333B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
    • 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
    • F02D41/20—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
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value

Definitions

  • the invention relates to a method for determining the opening delay time of a solenoid valve.
  • the invention further relates to a control device for controlling at least one solenoid valve in an injection system in an internal combustion engine.
  • the invention also relates to a computer program executable on a computing device, in particular on a control device for controlling a solenoid valve.
  • Solenoid valves are electrically operated switching valves that are used in many areas for the metering of gases or liquids.
  • fuel injectors controlled by solenoid valves are used in internal combustion engines, which allow metering of the fuel required for combustion in the internal combustion engine.
  • the fuel In the gasoline direct injection and the common rail injection, the fuel is injected directly into the combustion chamber of the internal combustion engine.
  • the metered amount of fuel is of crucial importance.
  • the metered amount of fuel in turn depends on the opening duration of the solenoid valve.
  • the opening duration is set via the activation duration of the solenoid valve coil provided in the solenoid valve, which is also referred to as the energization duration.
  • the solenoid valve In common-rail injectors for diesel injection, the solenoid valve is designed as a servo-valve and controls a downstream high-pressure hydraulics, which in turn the opening and Closing movement of the nozzle needle controls.
  • the valve needle of the injection nozzle In gasoline direct injection, the valve needle of the injection nozzle is controlled directly by the solenoid valve.
  • the opening duration corresponds to the activation duration of the solenoid valve minus the so-called lift-off delay plus the so-called closing duration.
  • the lift-off delay describes the delay time from the start of control of the solenoid valve until the time of opening; the closing time describes the delay time from the control end to the time of closing the solenoid valve.
  • suitable control methods can be used in order to optimally set the activation duration of the solenoid valve.
  • the object of the invention is to provide a method and a device for determining an opening delay time or a lift-off delay of a solenoid valve, wherein the opening delay time is as current as possible so that specimen scattering on the one hand and, for example, aging phenomena on the other hand can be taken into account and optimized fuel metering is made possible.
  • a control of the magnetic coil is performed in a measuring phase and it is determined a difference from the beginning of the control and from the opening time of the solenoid valve.
  • a control of the solenoid valve is performed for the determination of the opening time in the measuring phase.
  • the drive current is observed. If a change in the drive current is detected, it is concluded that the opening time has been reached.
  • an at least approximately constant driving voltage is applied to the magnetic coil in the measuring phase. This ensures reliable detection of a change in the drive current, since the change does not come from a changed one Activation results, but from the behavior of the magnetic coil itself.
  • the predetermined change is in particular a flattening of the drive current, which is preferably determined by determining a minimum of the differentiated current signal.
  • the advantage of the invention is a further reduction of the specimen spread of the injection quantity, since the method according to the invention can be applied individually for each solenoid valve. This is achieved by incorporating the tolerance-related opening delay time in the control method. The quantity control in the metering of the amount of fuel is then carried out by regulating the opening duration.
  • the drive voltage of the solenoid valve can be freely selected and is not subject to the restrictions during normal operation of the internal combustion engine. The measuring phase can be initiated automatically at certain times or at certain operating points.
  • the opening delay time is determined from the difference between the opening time of the solenoid valve and the start of control, wherein the start of control is known and the opening delay time according to the invention is determined from the current profile of the drive current of the solenoid valve.
  • a largely constant voltage is applied to the magnetic coil from the start of control and the drive current of the solenoid valve is detected and monitored, for example via a so-called measuring shunt.
  • a measuring shunt is a low-resistance electrical resistance, also known as a shunt resistor. It has been observed that from the moment the solenoid valve is opened, the current flow of the drive current flattens out. This flattening of the current signal is used according to the invention for detecting the opening time.
  • a detection of the flattening of the current signal can be determined, for example, by determining the minimum of the differentiated current signal.
  • the differentiation and determination of the minimum can be done either partially or entirely by analog preprocessing or by digital signal processing by means of a microcontroller.
  • the opening time of the solenoid valve is dependent on the electrical voltage of the drive current, by means of which the solenoid valve is controlled.
  • the opening time is determined in one or more operating points, each with a defined drive voltage. From each opening time determined in this way, the opening behavior or the opening time can be extrapolated for further control voltages.
  • the measuring phase can also be carried out during normal activation of the solenoid valve.
  • an at least approximately constant drive voltage is selected to ensure reliable detection of the opening time.
  • the invention in the form of a computer program which is executable on a computing device, in particular on a control unit for controlling and / or regulating a fuel injection in an internal combustion engine, wherein the computer program is programmed for carrying out the method according to the invention.
  • the computer program is preferably stored on an electronic or optical storage medium.
  • an internal combustion engine 10 which comprises a fuel tank 12, from which by means of a conveyor system 14 fuel is conveyed in a high-pressure fuel line 16.
  • the high pressure line 16 is formed for example as a common rail.
  • the high-pressure line 16 is connected to solenoid valves 18, which make it possible to inject fuel directly into the respective magnetic valves 18 associated combustion chambers 20.
  • the operation of the internal combustion engine 10 and in particular the fuel injection system, which is formed for example by the conveyor system 14, the high pressure line 16 and the solenoid valves 18 is controlled by a control and regulating device, such as a control unit 22.
  • the control unit 22 enables the acquisition of input values and the provision of output values or the actuation of actuators, in particular the activation of the solenoid valves 18.
  • FIG. 2 is a schematic in FIG. 1 shown solenoid valve 18 is shown enlarged.
  • the solenoid valve 18 has an electromagnetic actuator which has a magnetic coil 26 and a magnetic armature 30 cooperating with the magnetic coil 26.
  • the armature 30 is connected to a valve needle 28, that it is based on a in FIG. 2 vertical direction of movement of Valve needle 28 is movable.
  • a valve spring 36 exerts a spring force on the valve needle 28, so that it is held in a valve seat 38.
  • a control of the solenoid valve 18 by the controller 22 causes energization of the solenoid 26, causing the armature 30 moves upward so that it moves out of its valve seat 38 against the spring force, engaging in a stop the valve needle.
  • This situation is in FIG. 2b shown.
  • fuel 42 can now be injected from the solenoid valve 18 into the combustion chamber 20.
  • FIG. 3 the characteristics of a drive current 60, a drive current 61 and a valve lift 62 of the solenoid valve 18 are shown.
  • the activation of the solenoid valve 18 begins at a time T0.
  • T1 the opening of the solenoid valve 18.
  • the time period between T0 and T1 is referred to as Abhebeverzögerung or ⁇ réellesverzugszeit t 01 .
  • T2 the solenoid valve 18 is opened.
  • the time span t 12 denotes the opening duration of the solenoid valve 18.
  • the control of the solenoid valve 18 ends and at a time T5, the closing operation of the solenoid valve 18 takes place with a time delay t 45th
  • the time delay t 45 corresponds to the difference between the time T5 and the time T4.
  • the solenoid valve 18 is closed.
  • FIG. 3 illustrated situation shows a normal operation of the solenoid valve 18, for example, during operation of an internal combustion engine 10, to meter the fuel 42 required during combustion.
  • a particularly high voltage is initially applied to the solenoid valve 18 in a so-called boost phase t 02 in order to achieve a current increase as quickly as possible.
  • the so-called battery phase t 23 the voltage of the drive current is reduced; This completes the current increase phase.
  • the solenoid valve 18 is driven by individual voltage pulses, which cause a get the drive current.
  • the opening time t 16 from the drive duration t can be determined 04, wherein t of the control period 04, the opening delay time t is subtracted 01 and the closing delay time t is added 46th
  • FIG. 4 shows by way of example two current curves 60a, 60b, discharges 70a, 70b of the current profiles 60a, 60b and Nadelhubverrise 80a, 80b during a measurement phase according to the invention.
  • the respectively significant local minima correspond to the times T1a and T1b at which an opening of the solenoid valve 18 takes place.
  • a constant drive voltage of the valve is selected. This must also be ensured when the measurement phase takes place during operation of the internal combustion engine, since otherwise a reliable detection of the opening time from the current flow is not possible.
  • the opening time T1 is actually reached.
  • the boost phase with normal control of the solenoid valves 18 can not be extended arbitrarily until the opening time T1 of the solenoid valve 18 is reached safely, since the solenoid valve 18 would hit by the necessary high energy coupling at too high speed to the upper valve stop.
  • a measurement of the opening timing T1 is performed only in selected operating areas. Alternatively or additionally, the measurements can be carried out in a separate measurement phase.
  • suitable drive voltages can then be selected which are advantageously below the valve drive voltages which are used during the normal activation, that is to say, for example, during normal injections. Due to the lower drive voltage during the measurement phase, the measured opening delay time t 01 is extended . This is why in the subsequent an operating drive voltage resulting opening delay time converted. Since the actual opening delay time is considerably smaller than the measured opening delay time, measurement inaccuracies only have a greatly attenuated effect on the actual activation.
  • a real-time signal evaluation of the current profile is performed during the separate measurement phase. As soon as the opening time T1 is detected, the measuring phase is aborted immediately. As a result, the injection of an undesirable amount of fuel can be avoided, or at least reduced. If a low drive voltage is selected, the opening accuracy of the valve needle 28 is reduced, as a result of which the possibly unintentionally injected fuel quantity 42 is reduced to a level which is not relevant for the internal combustion engine 10.
  • FIG. 5 is a highly schematic flow diagram of an embodiment of the method according to the invention shown.
  • the method begins in a step 100 in which the measurement phase is started.
  • a control of the solenoid valve 18 takes place here by means of the drive current 60.
  • the drive current 60 is detected and monitored.
  • the derivative 70a, 70b of the detected drive current 60 is formed.
  • a step 102 it is checked whether there is a change of the driving current 60 indicating the reaching of the opening timing T1. For this purpose, for example, the course of the derivative 70a, 70b of the drive current 60 is then examined as to whether a local minimum exists. If this is not the case, then step 101 continues to monitor.
  • the determined opening time is stored in a suitable characteristic field in a step 103, optionally after compensation of effects resulting from a slightly selected drive voltage in the measurement phase.
  • opening times are extrapolated from the determined opening times for further operating points and also stored in the map.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Magnetically Actuated Valves (AREA)

Claims (11)

  1. Procédé pour définir le temps de retard d'ouverture (t01) d'une électrovanne (18), selon lequel une commande de l'électrovanne (18) a lieu dans une phase de mesure et une différence est déterminée à partir du début d'une commande et à partir de l'instant d'ouverture (T1) de l'électrovanne (18), l'instant d'ouverture (T1) étant défini en effectuant une commande de l'électrovanne (18) dans la phase de mesure, en observant le courant de commande (60) pendant la commande et en déduisant que l'instant d'ouverture (T1) a été atteint lorsqu'une variation pouvant être prédéfinie est détectée dans le courant de commande (60), caractérisé en ce que l'instant d'ouverture est déterminé dans une phase de mesure séparée, de sorte que le courant de commande (60, 60a, 60b) de l'électrovanne (18) dans la phase de mesure est indépendant de la commande de l'électrovanne (18) à des fins d'injection.
  2. Procédé selon la revendication 1, caractérisé en ce que dans la phase de mesure, une tension de commande (60a, 60b) au moins approximativement constante est appliquée à l'électrovanne (18).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'observation du courant de commande (60 ; 60a, 60b) est réalisée à l'aide d'un shunt de mesure.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que la variation pouvant être prédéfinie décrit un aplatissement du courant de commande (60 ; 60a, 60b).
  5. Procédé selon la revendication 4, caractérisé en ce que l'aplatissement est déterminé par une détermination d'un minimum du courant de commande différencié.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'instant d'ouverture est défini dans au moins un point de fonctionnement avec une tension de commande définie et le comportement d'ouverture pour au moins une tension de commande supplémentaire à un autre point de fonctionnement est extrapolé à partir de l'instant d'ouverture (T1).
  7. Procédé selon la revendication 6, caractérisé en ce que dans la phase de mesure séparée, la tension de commande est choisie de telle sorte que celle-ci est inférieure à la tension de commande qui est appliquée pendant le fonctionnement normal de l'électrovanne, et en ce que le calcul du temps de retard d'ouverture (t01) qui survient pendant le fonctionnement normal est calculé en se basant sur le temps de retard d'ouverture déterminé dans la phase de mesure séparée.
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce que pendant la phase de mesure, l'instant d'ouverture (T1) est déterminé au moyen d'une interprétation du signal en temps réel et la phase de mesure est interrompue dès que l'instant d'ouverture (T1) est détecté.
  9. Contrôleur (22) pour commander au moins une électrovanne (10) dans un système d'injection dans un moteur à combustion interne (10), caractérisé en ce que le contrôleur (22) comprend des moyens pour mettre en oeuvre un procédé selon l'une des revendications 1 à 9.
  10. Contrôleur (22) selon la revendication 9, caractérisé en ce que le contrôleur (22) est configuré pour commander les électrovannes (18) dans la phase de mesure avec une tension de commande faible au point que la quantité de carburant (42) injectée pendant la phase de mesure est réduite à une valeur non pertinente pour le fonctionnement du moteur à combustion interne (10).
  11. Programme informatique qui peut être exécuté sur un calculateur, notamment sur un contrôleur (22) destiné à commander une électrovanne (18), caractérisé en ce que le programme informatique est programmé pour mettre en oeuvre un procédé selon l'une des revendications 1 à 8 lorsque le programme informatique est exécuté sur le calculateur.
EP10720182.4A 2009-06-15 2010-06-01 Détermination du retard de levage d'une électrovanne Not-in-force EP2443333B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910026930 DE102009026930A1 (de) 2009-06-15 2009-06-15 Bestimmung der Abhebeverzögerung eines Magnetventils
PCT/EP2010/057638 WO2010145936A1 (fr) 2009-06-15 2010-06-01 Détermination du retard de levage d'une électrovanne

Publications (2)

Publication Number Publication Date
EP2443333A1 EP2443333A1 (fr) 2012-04-25
EP2443333B1 true EP2443333B1 (fr) 2014-10-29

Family

ID=42286675

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10720182.4A Not-in-force EP2443333B1 (fr) 2009-06-15 2010-06-01 Détermination du retard de levage d'une électrovanne

Country Status (4)

Country Link
EP (1) EP2443333B1 (fr)
CN (1) CN102803689B (fr)
DE (1) DE102009026930A1 (fr)
WO (1) WO2010145936A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201207289D0 (en) 2011-06-14 2012-06-06 Sentec Ltd Flux switch actuator
DE102011086151A1 (de) 2011-11-11 2013-05-16 Robert Bosch Gmbh Verfahren zum Betreiben mindestens eines Magnetventils
JP6398930B2 (ja) 2015-09-24 2018-10-03 株式会社デンソー 噴射制御装置
DE102015219145A1 (de) * 2015-10-02 2017-04-06 BSH Hausgeräte GmbH Haushaltsgerät
JP6289579B1 (ja) * 2016-10-20 2018-03-07 三菱電機株式会社 インジェクタ制御装置及びインジェクタ制御方法
DE102020213705A1 (de) 2020-10-30 2022-05-05 Volkswagen Aktiengesellschaft Verfahren zum Ermitteln eines Öffnungszeitpunkts eines Injektors mit einem Magnetventil, Computerprogramm, Steuergerät, Verbrennungskraftmaschine und Kraftfahrzeug

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3426799A1 (de) * 1984-07-20 1986-01-23 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur regelung der einer brennkraftmaschine einzuspritzenden kraftstoffmenge
DE3942836A1 (de) * 1989-12-23 1991-06-27 Daimler Benz Ag Verfahren zur bewegungs- und lagezustandserkennung eines durch magnetische wechselwirkung zwischen zwei endpositionen beweglichen bauteiles eines induktiven elektrischen verbrauchers
DE4011217A1 (de) * 1990-04-06 1991-10-10 Lucas Ind Plc Verfahren zum ansteuern eines magnetventils einer schlupf-regelanlage
DE4308811B9 (de) * 1992-07-21 2004-08-19 Robert Bosch Gmbh Verfahren und Einrichtung zur Steuerung einer magnetventilgesteuerten Kraftstoffzumeßeinrichtung
GB9225622D0 (en) * 1992-12-08 1993-01-27 Pi Research Ltd Electromagnetic valves
US7430899B2 (en) * 2006-10-27 2008-10-07 Ford Motor Company Methods and systems for testing electromagnetically actuated fuel injectors

Also Published As

Publication number Publication date
CN102803689A (zh) 2012-11-28
CN102803689B (zh) 2016-06-01
EP2443333A1 (fr) 2012-04-25
WO2010145936A1 (fr) 2010-12-23
DE102009026930A1 (de) 2010-12-16

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