EP0522908B1 - Verfahren und System um die Luftmenge in einem Zylinder einer Brennkraftmaschine zuzurechnen - Google Patents

Verfahren und System um die Luftmenge in einem Zylinder einer Brennkraftmaschine zuzurechnen Download PDF

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Publication number
EP0522908B1
EP0522908B1 EP19920401750 EP92401750A EP0522908B1 EP 0522908 B1 EP0522908 B1 EP 0522908B1 EP 19920401750 EP19920401750 EP 19920401750 EP 92401750 A EP92401750 A EP 92401750A EP 0522908 B1 EP0522908 B1 EP 0522908B1
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Prior art keywords
cylinder
mass
fresh air
theta1
pressure sensor
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EP19920401750
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English (en)
French (fr)
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EP0522908A1 (de
Inventor
Jean Balland
Rémi Lefevre
Vincent Bourbonneux
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Renault SAS
Regie Nationale des Usines Renault
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Renault SAS
Regie Nationale des Usines Renault
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
    • 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

Definitions

  • the invention relates to internal combustion engines and, more particularly in such engines, a method and a system for calculating the mass of fresh air contained in a cylinder.
  • the volume or the weight of the fuel can be known, with relative precision, by the duration of injection of the latter in the case of an injection engine.
  • several methods are used such as the measurement of the air flow in the intake manifold to the different cylinders, the measurement of the pressure in the intake manifold combined with the measurement of the engine speed. , the measurement of the opening angle of the intake throttle valve combined with the measurement of the engine speed.
  • Document US-A-4920 789 describes a system for calculating the mass of fresh air for each cylinder of a combustion engine comprising for each cylinder an injector, a pressure sensor and the injectors being controlled by the signals supplied by a computer, said computer receiving information on the angular position of the motor shaft and the signals supplied by the pressure sensors and means for measuring the voltage output U of each pressure sensor for at least two values THETA1 and THETA2 of the angular position of the motor shaft during the compression of the fresh air (in the casing) to obtain at least two values UTHETA1 and UTHETA2 of said voltage, means for determining the absolute temperature T-THETA1 of the mixture contained in the cylinder concerned for the position THETA1.
  • Document DE-A-4 000 220 describes a system for calculating the mass of fresh air contained in each cylinder of an engine comprising for each cylinder an injector, a pressure sensor, the injectors being controlled by the signals supplied by a computer, said computer receiving information on the angular position of the motor shaft and the signals supplied by the pressure sensors, said system for calculating the mass of fresh air maf in each cylinder comprises means for determining the mass of fuel mc injected into the cylinder concerned and the mass of burnt gas, which remains in the cylinder after exhaust, means for determining the temperature of the mixture means for measuring the output voltage U of each pressure sensor for a THETA1 value of the angular position of the motor shaft during the compression of fresh air means for calculating the mass of fresh air using the values determined previously.
  • An object of the invention is therefore to implement a method of calculating the mass of fresh air contained in each cylinder of an internal combustion engine from pressure measurements inside each cylinder.
  • Another object of the invention is a system for calculating the mass of fresh air contained in each cylinder of an internal combustion engine.
  • Direct measurements on the engine test bench consist of running the engine at a constant speed and measuring (U 90 ° -U 40 ° ) for different measured values of the mass of fresh air injected.
  • N 1200 revolutions / minute m af 0.292 0.386 0.473 0.560 0.662
  • N 2,300 rpm m af 0.331 0.422 0.518 0.616 0.704
  • U 90 ° -U 40 ° 44.5 54 64.5 75.5 87.5 either a line defined by the equation: U 90 ° -U 40 ° 114 m af + 5.96 with a correlation coefficient of 0.9987.
  • N 3,600 rpm m af 0.301 0.392 0.496 0.591 0.696
  • N 4,400 rpm m af 0.351 0.456 0.549 0.660 0.760
  • This mass of fresh air m af resulting from the calculation corresponds to the current cycle, is used for the calculation of the injection time of the following cycle and this for each cylinder, the ignition angle and more generally of all the variables set by the filling of the cylinders.
  • FIG. 2 The system which makes it possible to implement the method according to the invention will be described (FIG. 2) in its application to a four-cylinder engine C1, C2, C3, and C4 which are supplied with air by an intake manifold 20 common to four cylinders.
  • the inlet of this intake manifold is controlled by a butterfly valve 21 linked to the accelerator.
  • this conduit 20 is subdivided into four intake pipes T1, T2, T3 and T4 each leading to an intake valve SA1, SA2, SA3 and SA4.
  • Each manifold is associated with a fuel injector I1, I2, I3, and I4.
  • Each cylinder has a spark plug B1, B2, B3, or B4 for igniting the detonating mixture and a pressure sensor CP1, CP2, CP3, and CP4.
  • the burnt gases are evacuated to an exhaust pipe TE1, TE2, TE3, and TE4 by an exhaust valve SE1, SE2, SE3 and SE4, the four pipes joining together to form a conduit for exhaust 22.
  • the angular position of the motor shaft is identified using a toothed wheel 25 secured to the motor shaft and associated with a detector 26, the output terminal of which is connected to an input of a computer 27.
  • the computer conventionally supplies the control signals of the injectors I1 to I4 and of the spark plugs B1 to B4 as a function of various parameters such as engine speed, the position of the accelerator, that of the throttle valve 21.
  • the signals supplied by the pressure sensors CP1 to CP4 are applied to the computer 27 which performs, for each cylinder, the calculations defined by the method described above.
  • the values of ⁇ 1 and ⁇ 2 are different and the signals from the pressure sensors are only taken into account for the values ⁇ 1 and ⁇ 2 by appropriate sampling.
  • the fuel mass m c of each cylinder for a given cycle is determined by the computer 27 from the value of m af calculated for the previous cycle, this is what fixes the opening time of the injectors I1 to I4.
  • the pressure sensors CP1 to CP4 replace the pressure sensor of the intake manifold or the flow meter, the information of which is usually used to control the engine by means of the computer 27.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Claims (3)

  1. Verfahren zur Berechnung der Menge der in jedem Zylinder eines Verbrennungsmotors enthaltenen Frischluft, wobei jeder Zylinder (C1 bis C4) einen Einspritzer (I1 bis I4) und einen Druckfühler (CP1 bis CP4) aufweist und wobei die Einspritzer (I1 bis I4) durch Signale gesteuert werden, die von einem Rechner (27) stammen, der eine Winkelpositionsinformation THETA von der Motorwelle enthält, und durch Signale von den Druckfühlern (CP1 bis CP4), und wobei das Verfahren zur Berechnung der Menge der Frischluft maf in jedem Zylinder dadurch gekennzeichnet ist, daß es die folgenden Verfahrensschritte aufweist:
    a) Bestimmung der Menge des in den entsprechenden Zylinder eingespritzten Kraftstoffs mc und der Menge der verbrannten Gase mgbr, die nach dem Ausstoßen im Zylinder verbleiben, wobei mc, mgbr die gemessenen oder berechneten Mengen sind,
    b) Bestimmung der Konstanten k als Proportionalitätskonstante des Druckfühlers,
    c) Messung der Ausgangsspannung U eines jeden Druckfuhlers für wenigstens zwei Werte THETA1 und THETA2 der Winkelposition der Motorwelle während der Verdichtung des Gemisches aus Frischluft und Kraftstoffmenge, dergestalt, daß wenigstens zwei Werte UTHETA1 und UTHETA2 für die Spannung erhalten werden,
    d) Bestimmung der absoluten Temperatur TTHETA1 des im entsprechenden Zylinder enthaltenen Gemisches für die Position THETA1 und
    e) Berechnung der Menge der Frischluft maf unter Verwendung der Werte:
    UTHETA1; UTHETA2, T-THETA1, k, mc, mgbr.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Berechnung der Menge an Frischluft maf durch Anwendung der folgenden Gleichungen erhalten wird: m af = a' (U Θ2 - U Θ1 ) - b
    Figure imgb0031
     mit
    Figure imgb0032
     und b = m c + m gbr
    Figure imgb0033
     in den Gleichungen bedeuten:
    Vϑ1 das Volumen des entsprechenden Zylinders für die Position ϑ₁ = THETA1,
    Vϑ2 das Volumen des entsprechenden Zylinders für die Position ϑ₂ = THETA2,
    Tϑ1 die absolute Temperatur des im entsprechenden Zylinder enthaltenen Gemisches für die Position ϑ₁,
    R die Konstante der idealen Gase,
    k die Proportionalitätskonstante des entsprechenden Druckfühlers und
    x ein Exponent, welcher für die Formel des idealen Gases bei der polytropischen Kompression wie folgt definiert ist:
    Figure imgb0034
  3. Vorrichtung zur Berechnung der Menge der in jedem Zylinder eines Verbrennungsmotors enthaltenen Frischluft gemäß dem Verfahren nach Anspruch 1 oder 2, wobei der Motor für jeden Zylinder einen Einspritzer (I1 bis I4) sowie einen Druckfühler (CP1 bis CP4) aufweist und wobei die Einspritzer (I1 bis I4) durch die von einem Rechner (27) stammenden Signale gesteuert werden, der eine Winkelpositionsinformation THETA der Motorwelle erhält sowie von den Druckfühlern (CP1 bis CP4) stammende Signale, wobei die Vorrichtung zur Berechnung der Menge der in jedem Zylinder enthaltenen Frischluft maf dadurch gekennzeichnet ist, daß sie aufweist
    a) eine Anordnung zur Bestimmung der Menge des in den entsprechenden Zylinder eingespritzten Kraftstoffs mc und der Menge der verbrannten Gase mgbr, welche nach dem Ausstoßen im Zylinder verbleiben, wobei mc, mgbr die gemessenen oder berechneten Mengen sind,
    b) eine Anordnung zur Bestimmung von k als Proportionalitätskonstante des Druckfühlers,
    c) eine Anordnung zur Messung der Ausgangsspannung U eines jeden Druckfühlers für wenigstens zwei Werte THETA1 und THETA2 der Winkelposition der Motorwelle während der Kompression des Gemisches aus Frischluft und Menge an Kraftstoff, um wenigstens zwei Werte UTHETA1 und UTHETA2 für die Spannung zu erhalten,
    d) eine Anordnung zur Bestimmung der absoluten Temperatur T-THETA1 des im entsprechenden Zylinder enthaltenen Gemisches für die Position THETA1 und
    e) eine Rechenanordnung für die Menge der Frischluft maf unter Verwendung der Werte UTHETA1, UTHETA2, T-THETA1, k, mc, mgbr.
EP19920401750 1991-07-02 1992-06-23 Verfahren und System um die Luftmenge in einem Zylinder einer Brennkraftmaschine zuzurechnen Expired - Lifetime EP0522908B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9108246A FR2678684B1 (fr) 1991-07-02 1991-07-02 Procede et systeme de calcul de la masse d'air frais dans un cylindre de moteur a combustion interne.
FR9108246 1991-07-02

Publications (2)

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EP0522908A1 EP0522908A1 (de) 1993-01-13
EP0522908B1 true EP0522908B1 (de) 1995-10-11

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Publication number Priority date Publication date Assignee Title
US7200486B2 (en) * 2001-10-15 2007-04-03 Toyota Jidosha Kabushiki Kaisha Apparatus for estimating quantity of intake air for internal combustion engine
FR2835281B1 (fr) * 2002-01-25 2005-02-11 Peugeot Citroen Automobiles Sa Procede d'estimation de la masse d'air admise dans une chambre de combustion d'un moteur, et vehicule de mise en oeuvre
DE10316291B3 (de) * 2003-04-09 2004-11-11 Siemens Ag Verfahren zur Steuerung einer Brennkraftmaschine
FR2876739B1 (fr) 2004-10-18 2009-11-13 Peugeot Citroen Automobiles Sa Procede de regulation d'un systeme d'admission d'un moteur a combustion interne et vehicule automobile mettant en oeuvre ce procede
FR2878575B1 (fr) 2004-11-30 2007-04-06 Peugeot Citroen Automobiles Sa Procede de regulation d'un systeme d'admission d'un moteur a combustion interne et vehicule automobile pour la mise en oeuvre du procede
EP2275946A1 (de) 2005-03-04 2011-01-19 STMicroelectronics S.r.l. Probabilistische Neurale Netzwerk und entsprechendes Lernverfahren
FR2893675B1 (fr) * 2005-11-23 2007-12-28 Renault Sas Procede d'estimation de la masse des gaz enfermee pendant chaque cycle de fonctionnement dans la chambre de combustion d'un cylindre d'un moteur a combustion interne
GB0601727D0 (en) * 2006-01-27 2006-03-08 Ricardo Uk Ltd A Method Of Identifying Engine Gas Composition
FR2897653B1 (fr) * 2006-02-20 2011-07-15 Renault Sas Procede de commande d'un moteur de vehicule visant a determiner la masse de gaz enfermee dans une chambre de combustion
ES2446191B2 (es) * 2013-12-05 2014-06-27 Universitat Polit�Cnica De Val�Ncia Método de detección de la masa atrapada en un cilindro de combustión

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JPH01253543A (ja) * 1988-04-01 1989-10-09 Fuji Heavy Ind Ltd エンジンの空燃比制御装置
JPH02277939A (ja) * 1989-01-07 1990-11-14 Mitsubishi Electric Corp エンジンの燃料制御装置
DE3917908A1 (de) * 1989-06-01 1990-12-06 Siemens Ag Verfahren zum bestimmen der luftfuellung des arbeitsvolumen einer fremdgezuendeten kolbenbrennkraftmaschine und zum bestimmen der kraftstoffeinleitmasse
US4920789A (en) * 1989-09-19 1990-05-01 General Motors Corporation Method and means for determining air mass in a crankcase scavenged two-stroke engine

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EP0522908A1 (de) 1993-01-13
DE69205352D1 (de) 1995-11-16
FR2678684B1 (fr) 1995-01-06
FR2678684A1 (fr) 1993-01-08
DE69205352T2 (de) 1996-06-05

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