EP1934452B1 - Dispositif de detection de charge sur la base d'une pression - Google Patents

Dispositif de detection de charge sur la base d'une pression Download PDF

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Publication number
EP1934452B1
EP1934452B1 EP06792231A EP06792231A EP1934452B1 EP 1934452 B1 EP1934452 B1 EP 1934452B1 EP 06792231 A EP06792231 A EP 06792231A EP 06792231 A EP06792231 A EP 06792231A EP 1934452 B1 EP1934452 B1 EP 1934452B1
Authority
EP
European Patent Office
Prior art keywords
intake manifold
manifold pressure
pressure
determined
air mass
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 - Fee Related
Application number
EP06792231A
Other languages
German (de)
English (en)
Other versions
EP1934452A1 (fr
Inventor
Heiko Konrad
Maximilian Engl
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP1934452A1 publication Critical patent/EP1934452A1/fr
Application granted granted Critical
Publication of EP1934452B1 publication Critical patent/EP1934452B1/fr
Expired - Fee Related 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
    • F02D41/24—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
    • F02D41/2474—Characteristics of sensors
    • 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
    • F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
    • 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
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0402—Engine intake system parameters the parameter being determined by using a model of the engine intake or its components
    • 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
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0406—Intake manifold pressure
    • 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
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0406—Intake manifold pressure
    • F02D2200/0408—Estimation of intake manifold pressure

Definitions

  • the invention relates to a device for pressure-based load detection according to the subject-matter of claim 1.
  • In the load detection is the determination of the air mass, which is sucked for the purpose of combustion in the combustion chamber of a cylinder of an internal combustion engine.
  • two methods are to be distinguished here - those based on an immediate measurement of the air mass by means of sensors (eg hot-film air mass sensor, hot-wire air mass sensor or the like), and those which operate without a direct air mass measurement.
  • sensors eg hot-film air mass sensor, hot-wire air mass sensor or the like
  • direct air mass measurement the air mass flowing into the intake manifold is measured and the air mass flowing into the cylinder from the intake manifold is calculated by means of a calculation model which describes the intake manifold dynamics.
  • the measured intake manifold pressure is usually used, from which an air mass model is used to deduce the incoming air mass.
  • These methods are also referred to as pressure-based or suction tube pressure-based methods for load detection.
  • the air mass is determined as a function of the intake manifold pressure and the temperature of the air in the intake manifold.
  • complex calculation models are required, which describe the fresh air mass flow from the collector in the intake to the combustion chamber of the cylinder.
  • Parameters to be taken into account here are, in particular, the engine speed, the camshaft position and / or the lift positions and / or lift positions of exhaust and intake valves, the engine temperature and, with supercharged engines: the position of the bypass (Wastegate).
  • the fresh air mass remaining in the cylinders steadily increases with the intake manifold pressure with otherwise identical input parameters (parameters) ( FIG. 2 ).
  • Known devices for the pressure-based determination of the air mass (load) therefore include suction tube pressure sensors, which can cover or measure the entire intake manifold pressure range.
  • the invention has for its object to provide a device that ensures improved accuracy of the load detection, especially in low load ranges.
  • the invention is based on the finding that measurement errors occur due to the tolerance of the sensors, which have different effects in the different load ranges.
  • a distinction between an absolute measurement error, the proportion (amount) over the entire measuring range is always the same and which corresponds to a percentage of the final value, and a relative measurement error, the proportion of which changes depending on the height of the measured value .
  • the relative measurement error increases disproportionately at small intake pipe pressures (loads) and thus has a particularly disadvantageous effect on the accuracy of the load signal.
  • high accuracy of the load signal is extremely important for drivability of a motor vehicle (e.g., in the transition from high loads to idle).
  • load calculation models of direct-injection supercharged engines are sensitive to existing pressure sensor tolerances.
  • the gradient is twice that of non-supercharged engines due to high valve overlaps (i.e., phases in which both intake and exhaust valves are open) and the intake manifold pressure range to be sensed.
  • the device according to the invention is therefore particularly suitable for directly supercharged supercharged internal combustion engines.
  • a device according to the invention comprises a
  • the absolute measuring error is smaller than with a measuring device that covers the entire physical measuring range (total physical intake manifold pressure range). Further, due to the smaller relative measurement error, the error in determining the load as a function of the measured intake manifold pressure is considerably smaller for smaller loads. Outside the pressure range of the pressure sensor used, the intake manifold pressure is determined by means of a calculation model and the required load is calculated on the basis of the calculated intake manifold pressure. The present error due to the calculation model for calculating the intake manifold pressure in the upper intake manifold pressure range is significantly less noticeable, so that clearly outweigh the benefits of increased accuracy in the lower intake manifold pressure range.
  • the intake manifold pressure (value) measured in the lower part of the intake manifold pressure range is used directly as an input to a load sensing model to determine the load.
  • the intake manifold pressure can be simulated over the entire intake manifold pressure range via a calculation model, wherein the measured intake manifold pressure is supplied to a regulator device in the lower Saugrohrbuchteil Colour (in which the intake manifold pressure is detected by a sensor device) is adjusted over the modeled intake manifold pressure to the measured intake manifold pressure.
  • the sensor device is preferably designed such that it covers the entire Saugrohrbuch Kunststoff Kunststoff #2 without active supercharger (in this lower pressure range so the intake manifold pressure is determined directly via a measurement), while in the pressure range above the maximum mammoth pressure without active Charger device to intake manifold maximum pressure with active charger device, the intake manifold pressure is determined model-based.
  • FIG. 1 is schematically shown a cylinder 2 of an internal combustion engine of a motor vehicle together with its associated intake and its associated exhaust tract.
  • a piston 4 driven by a crankshaft not shown, moves up and down.
  • the valve drive represented in simplified form by an inlet valve EV and an outlet valve AV together with the associated valve control, which is preferably designed as a valve control variable with respect to the valve timing and / or the valve strokes, the various cycles of a combustion process are realized.
  • the intake tract comprises a suction pipe 6 with a collector 6a, wherein in the collector 6a for measuring the intake manifold pressure P SD is designed as a Saugrohrdrucksensor sensor device S SD is arranged and a controllable throttle 8.
  • P SD intake manifold pressure
  • S SD Saugrohrdrucksensor sensor
  • a controllable throttle 8 In the illustrated embodiment with Ladereihraum is seen in the intake further a in the air flow direction In front of the throttle valve 8 arranged boost pressure sensor S LD , a charge air cooler 10 and a compressor unit 12 of a charger provided.
  • an exhaust manifold 14 with an integrated turbine unit 16 of the charger and associated controllable bypass 18 (wastegate) is shown.
  • the air mass flowing into the combustion chamber is not equal to the air mass remaining in the combustion chamber at some operating points, since a so-called over-flushing can occur, especially in supercharger operation due to valve overlaps, in which portions of the air mass supplied to the combustion chamber are still in the intake stroke in the exhaust tract be forwarded and thus not available in the combustion process.
  • FIG. 3 a first preferred embodiment of the device according to the invention is illustrated.
  • the device according to the invention is designed such that via the intake manifold pressure P SD , P SD 'the incoming air mass LM can be determined by means of a calculation model M LE for load detection.
  • a sensor device S SD for direct detection of the intake manifold pressure P SD which is designed (designed) with respect to its measuring range such that the intake manifold pressure P SD can only be measured in a lower intake manifold pressure portion of the internal combustion engine.
  • a calculation model M SD for indirect detection of the intake manifold pressure P SD ' is present, which is designed such that hereby the intake manifold pressure P SD ' can be determined by calculation in an upper intake manifold pressure portion of the internal combustion engine.
  • the device is designed such that within the lower Saurohrbuchteilrios the incoming air mass LM is determined as a function of the measured by means of sensor S SD intake manifold pressure P SD , and that within the upper Saugrohrteilteil Schemes the incoming air mass LM via the determined by means of calculation model M SD intake manifold pressure P SD 'is determined.
  • a monitoring device ÜE is provided, by means of which it is monitored whether the actual intake manifold pressure is within the measuring range of the sensor device S SD or not.
  • the measured intake manifold pressure P SD is forwarded directly to the calculation model M LE for load detection for further processing. If there is an intake manifold pressure that is outside the measuring range (x> P sensor_max ) of the sensor device S SD , an intake manifold pressure P SD 'is calculated and this forwarded instead of the measured intake manifold pressure P SD for further processing to the calculation model M LE for load detection (or for determining the air mass LM).
  • the selection of which intake manifold pressure (measured intake manifold pressure P SD or model-based calculated intake manifold pressure P SD ') is relevant and is forwarded is realized via a diverter element W controlled by the monitoring device UE.
  • the device according to the invention for determining the load can be designed such that it always works with a model-based intake manifold pressure P SD 'as an input signal for the calculation model M LE for load detection.
  • a device according to FIG. 4 Use.
  • the intake manifold pressure P SD ' is always model-based determined, depending on whether the intake manifold pressure is within the measuring range of the sensor device S SD or not, the calculated intake manifold pressure P SD ' is adjusted via a correction value K to the measured intake manifold pressure P SD or calculated intake manifold pressure P SD 'remains unchanged.
  • a correction value K for calculating the intake manifold pressure P SD ' is determined via a balancing regulator R.
  • the correction quantity K is determined by means of a difference between measured intake manifold pressure P SD and calculated intake manifold pressure P SD 'fed to balancing regulator R, and the calculated intake manifold pressure P SD ' is compared to the measured intake manifold pressure P SD . If the intake manifold pressure value is outside the sensor measurement range, the calculation model M SD for calculating the intake manifold pressure P SD 'can not be adjusted to the measured intake manifold pressure P SD .
  • the unbalanced calculated intake manifold pressure value P SD ' is then used directly as input to the post-order calculation model M LE for load detection.
  • the calculation model for load detection instead of the correction value K, a neutral value N is fed to the calculation of the intake manifold pressure is not affected.

Abstract

L'invention concerne un dispositif de détermination, sur la base de la pression régnant dans la tubulure d'admission, de la masse d'air (LM) qui afflue dans la chambre de combustion d'un cylindre d'un moteur à combustion interne d'un véhicule automobile. Ce dispositif comprend une unité logique qui permet de déterminer, à partir de la pression régnant dans la tubulure d'admission, la masse d'air à l'aide d'un modèle de calcul destiné à la détection de charge. Selon l'invention, un dispositif détecteur (SSD) permettant la détection directe de la pression régnant dans la tubulure d'admission (PSD) est réalisé de telle façon que la pression régnant dans la tubulure d'admission est mesurable exclusivement dans une zone partielle inférieure de la pression de la tubulure d'admission du moteur à combustion interne. En outre, un modèle de calcul (MSD) permettant la détection indirecte de la pression régnant dans la tubulure d'admission est conçu de manière à permettre la détermination par calcul de la pression régnant dans la tubulure d'admission dans une zone partielle supérieure du moteur à combustion interne. L'unité logique est selon l'invention réalisée de telle façon que dans les limites de la zone partielle inférieure de pression de la tubulure d'admission, la masse d'air affluente est déterminée en fonction de la pression de la tubulure d'admission mesurée par le dispositif détecteur, et que, dans les limites de la zone partielle supérieure de la pression régnant dans la tubulure d'admission, la masse d'air affluente peut être déterminée par la pression de tubulure d'admission déterminée à l'aide du modèle de calcul.

Claims (3)

  1. Dispositif pour déterminer la masse d'air (LM) arrivant dans la chambre de combustion d'un cylindre de moteur à combustion interne de véhicule automobile selon lequel on détermine la masse d'air entrant (LM) à l'aide d'un modèle de calcul (MLE) pour saisir la charge en fonction de la pression (PSD) de la tubulure d'aspiration, et
    le dispositif comporte :
    - une installation de capteur (SSD) pour la saisie directe de la pression de la tubulure d'aspiration (PSD) avec une plage de mesure de façon qu'à l'aide de l'installation de capteur (SSD), on mesure exclusivement la pression de la tubulure d'aspiration (PSD) dans une plage partielle, inférieure, des pressions de tubulure d'aspiration du moteur à combustion interne, et
    - un modèle de calcul (MSD) pour la saisie indirecte de la pression (PSD') de la tubulure d'aspiration, réalisé pour déterminer ainsi par calcul, la pression de la tubulure d'aspiration (PSD') dans la zone partielle supérieure des pressions de tubulure d'aspiration du moteur à combustion interne, et
    - le dispositif est réalisé pour déterminer à l'intérieur de la plage partielle inférieure des pressions de tubulure d'aspiration, la masse d'air entrant (LM) en fonction de la pression de tubulure d'aspiration (PSD) mesurée à l'aide de l'installation de capteur (SSD), et à l'intérieur de la plage partielle supérieure des pressions de tubulure d'aspiration, on détermine la masse d'air entrant (LM) par la pression de tubulure d'aspiration (PSD') obtenue à l'aide du modèle de calcul (MSD).
  2. Dispositif selon la revendication 1,
    caractérisé en ce qu'
    il est réalisé pour un moteur à combustion interne à suralimentation, l'installation de capteur (SSD) ayant une plage de mesure qui correspond à la plage des pressions allant jusqu'à la pression maximale de la tubulure d'aspiration sans que l'installation de suralimentation ne soit activée, et la pression de tubulure d'aspiration (PSD) se détermine dans cette plage de pressions, directement par l'installation de capteur (SSD), et
    la pression de la tubulure d'aspiration (PSD'), se détermine à l'aide du modèle de calcul (MSD), dans la plage des pressions au-dessus de la pression maximale de la tubulure d'aspiration, sans mise en oeuvre de l'installation de suralimentation jusqu'à la pression maximale avec mise en oeuvre de l'installation de suralimentation.
  3. Dispositif selon les revendications précédentes,
    caractérisé en ce qu'
    on détermine la pression de la tubulure d'aspiration, dans toute la plage des pressions de tubulure d'aspiration, par le modèle de calcul (MSD) servant à déterminer la pression de tubulure d'aspiration (PSD'), et dans la plage partielle inférieure des pressions de la tubulure d'aspiration, on équilibre la pression déterminée de tubulure d'aspiration (PSD') par rapport à la pression mesurée de la tubulure d'aspiration (PSD).
EP06792231A 2005-09-29 2006-09-22 Dispositif de detection de charge sur la base d'une pression Expired - Fee Related EP1934452B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005046504A DE102005046504A1 (de) 2005-09-29 2005-09-29 Vorrichtung zur druckbasierten Lasterfassung
PCT/EP2006/009229 WO2007036330A1 (fr) 2005-09-29 2006-09-22 Dispositif de detection de charge sur la base d'une pression

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EP1934452A1 EP1934452A1 (fr) 2008-06-25
EP1934452B1 true EP1934452B1 (fr) 2009-03-11

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EP06792231A Expired - Fee Related EP1934452B1 (fr) 2005-09-29 2006-09-22 Dispositif de detection de charge sur la base d'une pression

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US (1) US7546760B2 (fr)
EP (1) EP1934452B1 (fr)
DE (2) DE102005046504A1 (fr)
WO (1) WO2007036330A1 (fr)

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
DE102009003285B4 (de) * 2009-05-20 2021-01-07 Robert Bosch Gmbh Verfahren zur Diagnose von Drucksensoren einer Luftzuführung einer Brennkraftmaschine
JP5204162B2 (ja) * 2009-08-05 2013-06-05 本田技研工業株式会社 車両用変速制御装置
DE102014003276A1 (de) * 2014-03-12 2015-09-17 Man Truck & Bus Ag Brennkraftmaschine,insbesondere Gasmotor,für ein Kraftfahrzeug

Family Cites Families (13)

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US5003950A (en) * 1988-06-15 1991-04-02 Toyota Jidosha Kabushiki Kaisha Apparatus for control and intake air amount prediction in an internal combustion engine
KR100413402B1 (ko) 1995-04-10 2004-04-28 지멘스 악티엔게젤샤프트 모델을이용하여내연기관실린더내측으로의공기질량을측정하는방법
KR100462458B1 (ko) * 1996-03-15 2005-05-24 지멘스 악티엔게젤샤프트 외부배기가스를재순환하는내연기관의실린더로유입되는맑은공기의질량을모델을이용하여결정하는방법
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DE10049907B4 (de) * 2000-10-10 2014-09-11 Robert Bosch Gmbh Verfahren, Computerprogramm und Steuer- und/oder Regeleinrichtung zum Betreiben einer Brennkraftmaschine
DE10102914C1 (de) * 2001-01-23 2002-08-08 Siemens Ag Verfahren zum Ermitteln eines Schätzwertes eines Massenstroms in den Ansaugtrakt einer Brennkraftmaschine
EP1715163A1 (fr) * 2001-11-28 2006-10-25 Volkswagen Aktiengesellschaft Procédé pour déterminer la composition d'un mélange gazeux dans une chambre de combustion d'un moteur à combustion interne comprenant une conduite de recyclage des gaz d'échappemment
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EP1645743B1 (fr) * 2003-07-10 2019-05-08 Toyota Jidosha Kabushiki Kaisha Procédé d'estimation de la quantité d'air aspiré d'un cylindre de moteur à combustion interne
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JP4143862B2 (ja) * 2004-11-29 2008-09-03 トヨタ自動車株式会社 内燃機関の空気量推定装置

Also Published As

Publication number Publication date
DE502006003125D1 (de) 2009-04-23
EP1934452A1 (fr) 2008-06-25
US20080229816A1 (en) 2008-09-25
US7546760B2 (en) 2009-06-16
WO2007036330A1 (fr) 2007-04-05
DE102005046504A1 (de) 2007-04-05

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