EP0970304B1 - Procede et dispositif de regulation de la pression dans des systemes d'injection a accumulation avec un element d'ajustement de la pression - Google Patents

Procede et dispositif de regulation de la pression dans des systemes d'injection a accumulation avec un element d'ajustement de la pression Download PDF

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Publication number
EP0970304B1
EP0970304B1 EP99907265A EP99907265A EP0970304B1 EP 0970304 B1 EP0970304 B1 EP 0970304B1 EP 99907265 A EP99907265 A EP 99907265A EP 99907265 A EP99907265 A EP 99907265A EP 0970304 B1 EP0970304 B1 EP 0970304B1
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EP
European Patent Office
Prior art keywords
pressure
current value
pressure control
control element
electromagnetic actuation
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
EP99907265A
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German (de)
English (en)
Other versions
EP0970304A1 (fr
Inventor
Dirk Heinitz
Benno Larisch
Martin Hecker
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
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
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Publication of EP0970304A1 publication Critical patent/EP0970304A1/fr
Application granted granted Critical
Publication of EP0970304B1 publication Critical patent/EP0970304B1/fr
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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
    • 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
    • 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
    • F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
    • 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
    • F02D2041/1418—Several control loops, either as alternatives or simultaneous
    • F02D2041/1419—Several control loops, either as alternatives or simultaneous the control loops being cascaded, i.e. being placed in series or nested
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/31—Control of the fuel pressure

Definitions

  • the invention relates to a device and a Method for regulating a pressure in a high pressure accumulator for fuel injection systems with a pressure actuator that a shut-off body operated by an electromagnetic drive having.
  • the high pressure accumulator is still with a pressure actuator provided, about the excess fuel that is not used Maintaining the desired pressure in the high pressure accumulator is returned to the fuel tank becomes.
  • the holding pressure in the pressure actuator is determined by the electronic Control unit of the internal combustion engine according to one measured by a pressure sensor in the high pressure accumulator Actual value and that in the respective operating state of the internal combustion engine desired setpoint.
  • the solenoids used in the pressure actuators are made of a conductive material, the more specific Resistance is temperature-dependent, the through the current flowing in the magnet coil and thus also the current on the Shut-off element acting anchor force through the coil temperature affected.
  • the temperature increase in turn leads to the through the temperature-dependent resistance in the coil winding to change the flowing through the solenoid Current and thus the resulting holding force in Pressure actuator.
  • the holding force generally drops because the coil materials used are mostly conductors where the resistance increases when the temperature rises, which leads to a reduction in electricity.
  • the pressure actuator control unit the electronic control unit of the Adjust the internal combustion engine to the desired level To be able to set pressure in the pressure accumulator.
  • readjustment leads to a deterioration in the control dynamics of the pressure actuator, so that for the operating condition optimal pressure in the high pressure accumulator only delayed is achieved.
  • the pressure actuator generally has wide control limits used so that there are sufficient positioning speeds result in the pressure control.
  • Such high positioning speeds however, increase the risk of overshoot the pressure control and thus impair the stability of the control loop.
  • high positioning speeds result often very high current peaks in the magnetic coil of the Pressure actuator that can cause damage.
  • DE-A-195 48 278 describes a method and a device to regulate one connected to a high pressure accumulator High pressure control valve known in which an im electromagnetic drive of the high pressure control valve detected Current value with a desired setpoint value derived reference current value compared and in the event of a deviation by the electromagnetic drive of the high pressure control valve flowing current value is adjusted.
  • the object of the present invention is a method and a device for regulating a pressure actuator for a To provide high-pressure accumulators that have optimal control dynamics show and at the same time reliable damage to the Avoid pressure actuator.
  • a pressure actuator via a cascade control set, with a first control device a pressure value recorded in a high-pressure accumulator with a The setpoint compares and depending on this comparison a control signal with a nominal current value for a solenoid of the electromagnetically actuated pressure actuator and a second downstream control device one in the Magnetic coil flowing current value detected and with the current setpoint compares and depending on this comparison one Adapts the current value in the solenoid.
  • FIG. 1 schematically shows the structure of a fuel injection system, like it is called the common rail system is mainly used in diesel engines.
  • this Injection system is fuel from a fuel tank 10 via a fuel line 11 by means of a Pre-feed pump 12 is sucked in and by this via a fuel filter 13 promoted to a high pressure pump 15.
  • the high pressure pump 15 then injects the fuel under high pressure a high pressure accumulator 17.
  • the high pressure accumulator 17 communicates with injectors 18 through which the Fuel into the cylinders of the internal combustion engine (not shown) is injected.
  • the injection process is carried out by a electronic control unit 19 triggered via signal lines 20 is connected to the injection valves 18.
  • the leakage current occurring in the injection valves 18 fed back into the fuel tank 10 via fuel lines 21.
  • the pressure control valve 16 controls excess fuel via a fuel line 25, which is not used to maintain the high pressure accumulator 17 desired pressure is required in the fuel tank 10 from.
  • the pressure control valve 16 is the electronic control unit 19 by means of an integrated Control unit via a control line 24 corresponding to a Pressure from a pressure sensor attached to the pressure accumulator 17 23 is measured, set.
  • FIG. 2 shows schematically the structure of the pressure control valve 16.
  • This pressure control valve 16 has a valve housing 161 with an inlet opening 162 which is connected to a fuel line 111 is connected to the high pressure accumulator 17.
  • An outlet opening 168 is also provided in the valve housing 161, to those in the fuel tank 10 returning fuel line 25 is connected.
  • the inlet opening 162 has a conically opening inwards Sealing seat in which is also a conical Blocking body 163 engages.
  • This shut-off body 163 sits on one end with its base Locking rod 164, with its other end through a bore protrudes from the valve housing 161.
  • valve spring 166 continues around the locking rod 164 arranged that the shut-off body with a spring preload busy.
  • the locking rod 164 is a magnet armature 165, wherein between this armature 165 and the valve housing 161 a live solenoid around the locking bar 164 167 is provided.
  • the pressure control valve 16 shown schematically in FIG. 2 works as follows: acts on the shut-off element in the closing direction 163 a holding force resulting from the spring 166 applied spring force and that of the current carrying Solenoid coil 167 composed armature force.
  • the shut-off body 163 engages in High pressure accumulator 17 prevailing fuel pressure over the Fuel line 111 on.
  • By changing the energization of the solenoid coil 167 can the armature force and thus the holding force counteracting the fuel pressure the shut-off body 163 can be adjusted.
  • the solenoid coil 167 of the pressure control valve 16 is in the generally with a pulse-width-modulated control signal acted upon by the control unit of the electronic control unit 19.
  • the electronic control unit fits Control unit 19, the anchor force and thus the Holding force of the pressure control valve 16 to the desired pressure in the high pressure accumulator 17.
  • the control unit of the electronic control unit 19 consists of as the block diagram in Figure 3 shows, from a Cascade connection of a controller 191 and a downstream one Current regulator 192, the following control process being carried out is:
  • the pressure prevailing in the high-pressure accumulator 17 is determined by the amount of fuel in the high-pressure accumulator certainly. This amount of fuel is made up of the High pressure pump 15 fed fuel flow during the injection quantity delivered via the Injection valves flowing leakage current and the Pressure control valve 16 fuel together, wherein both the leakage flow of the injectors and the Fuel quantity controlled by the pressure control valve 16 depend fuel pressure prevailing in the high pressure accumulator 17.
  • the gain factor and the reset time are included according to the desired control behavior of the pressure control valve 16 specified.
  • the calculated control value TV represents a pulse duty factor of the pulse-width modulated control signal for the current-carrying solenoid coil 167 of the pressure control valve 16, where the duty cycle is the ratio of pulse duration, i.e. the time at which the solenoid 167 is powered is supplied at the period, i.e. the distance between two current pulses.
  • the to the current-carrying solenoid 167 issued control value still has one fixed current value.
  • the current flowing through the magnetic coil 167 leads to heat in the magnet coil 16 due to the resistance heating occurring in the current-carrying coil elements.
  • This heat development in turn affects the temperature-dependent specific resistance of the current carrying Elements in the solenoid 16, being conventional in the used current-carrying elements of resistance increases with temperature.
  • This due to the development of heat caused increase in resistance in the current carrying Coil elements in turn lead to a lowering of the current value flowing through the solenoid coil 167.
  • this reduction in the current value reduces the anchor force acting on the shut-off body 163, resulting in a Low pressure in the high pressure accumulator 17 leads.
  • the magnetic current value and their readjustment in a sub-control loop are the through the temperature dependence of the through the solenoid flowing current caused interference the regulation of the pressure control valve 16 compensated so that a very fast control loop with high control dynamics results.
  • the PI controller 191, the ammeter 193 and the Current regulators 192 can also be used instead of the electronic ones Control unit 19, integrated directly into the pressure control valve 16 become.
  • the invention Pressure control for all types of pressure regulators with electromagnetic Carry out drive in internal combustion engines.

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)

Abstract

Dans un système d'injection à accumulation comportant un élément d'ajustement de la pression (16), qui présente un mécanisme d'entraînement électromagnétique (165, 167), la régulation de la pression s'effectue à l'aide d'un montage en cascade de deux dispositifs de régulation. Le premier dispositif de régulation (191) détermine un signal d'attaque avec une valeur de courant théorique pour le mécanisme d'entraînement électromagnétique et un second dispositif de régulation (192) adapte la valeur de courant détectée dans le mécanisme d'entraînement électromagnétique, à la valeur de courant théorique prédéterminée.

Claims (6)

  1. Dispositif de régulation de la pression dans un accumulateur (17) à haute pression pour un système d'injection de carburant, comportant
       un élément (16) de réglage de pression, qui est raccordé à l'accumulateur à haute pression et possède un corps (163) d'obturation actionné par un entraínement (165, 167) électromagnétique,
       un premier régulateur (191), qui compare une valeur de pression détectée dans l'accumulateur (17) à haute pression à une valeur de pression de consigne prescrite et, en fonction du résultat de cette comparaison, détermine un signal d'asservissement avec une valeur de courant de consigne pour l'entraínement électromagnétique de l'élément de réglage de pression,
    caractérisé en ce qu'un deuxième régulateur (192), qui est relié à la suite du premier régulateur (191), compare une valeur de courant détectée dans l'entraínement (165, 167) électromagnétique de l'élément (16) de réglage de pression à la valeur de courant de consigne prescrite et, en cas d'écart par rapport à la valeur de courant de consigne de la valeur de courant passant dans l'entraínement électromagnétique de l'élément de réglage de pression, réajuste cette valeur de courant.
  2. Dispositif suivant la revendication 1, le premier régulateur (191) étant un régulateur de pression conçu comme régulateur proportionnel et par intégration (régulateur PI).
  3. Dispositif suivant la revendication 1 ou 2, le premier régulateur (191) établissant un taux d'impulsions pour un signal d'asservissement à modulation d'impulsions en durée pour l'entraínement électromagnétique de l'élément (16) de réglage de pression.
  4. Procédé de régulation de la pression dans un accumulateur (17) à haute pression pour un système d'injection de carburant comportant un élément (16) de réglage de pression qui est raccordé à l'accumulateur à haute pression et possède un corps (163) d'obturation actionné par un entraínement (165, 167) électromagnétique,
    comprenant les étapes suivantes :
    comparaison de la valeur de pression détectée dans l'accumulateur (17) à haute pression à une valeur de pression de consigne prescrite ;
    détermination, en fonction du résultat de la comparaison, d'un signal d'asservissement avec une valeur de courant de consigne pour l'entraínement électromagnétique de l'élément de réglage de pression ;
    détection de la valeur de courant passant dans l'entraínement (165, 167) électromagnétique de l'élément (16) de réglage de pression ; et
    adaptation à la valeur de courant de consigne prescrite de la valeur de courant passant dans l'entraínement électromagnétique de l'élément de réglage de pression.
  5. Procédé suivant la revendication 4, le signal d'asservissement avec la valeur de courant de consigne pour l'entraínement (165, 167) électromagnétique de l'élément (16) de réglage de pression étant déterminé au moyen d'une régulation proportionnelle et par intégration (régulation PI).
  6. Procédé suivant la revendication 4 ou 5, le signal d'asservissement pour l'entraínement (165, 167) électromagnétique de l'élément (16) de réglage de pression étant un signal à modulation d'impulsions en durée, et la régulation s'effectuant en modifiant le taux d'impulsions de ce signal à modulation d'impulsions en durée.
EP99907265A 1998-01-23 1999-01-21 Procede et dispositif de regulation de la pression dans des systemes d'injection a accumulation avec un element d'ajustement de la pression Expired - Lifetime EP0970304B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19802583A DE19802583C2 (de) 1998-01-23 1998-01-23 Vorrichtung und Verfahren zum Druckregeln in Speichereinspritzsystemen mit einem elektromagnetisch betätigten Druckstellglied
DE19802583 1998-01-23
PCT/DE1999/000147 WO1999037903A1 (fr) 1998-01-23 1999-01-21 Procede et dispositif de regulation de la pression dans des systemes d'injection a accumulation avec un element d'ajustement de la pression

Publications (2)

Publication Number Publication Date
EP0970304A1 EP0970304A1 (fr) 2000-01-12
EP0970304B1 true EP0970304B1 (fr) 2002-12-11

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EP99907265A Expired - Lifetime EP0970304B1 (fr) 1998-01-23 1999-01-21 Procede et dispositif de regulation de la pression dans des systemes d'injection a accumulation avec un element d'ajustement de la pression

Country Status (4)

Country Link
US (1) US6119655A (fr)
EP (1) EP0970304B1 (fr)
DE (2) DE19802583C2 (fr)
WO (1) WO1999037903A1 (fr)

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Also Published As

Publication number Publication date
DE19802583A1 (de) 1999-08-05
DE19802583C2 (de) 2002-01-31
EP0970304A1 (fr) 2000-01-12
US6119655A (en) 2000-09-19
WO1999037903A1 (fr) 1999-07-29
DE59903717D1 (de) 2003-01-23

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