EP1377734B1 - Procede de calcul de la masse d'air admise dans le cylindre d'un moteur a combustion interne equipant un vehicule automobile et calculateur d'injection mettant en oeuvre le procede - Google Patents

Procede de calcul de la masse d'air admise dans le cylindre d'un moteur a combustion interne equipant un vehicule automobile et calculateur d'injection mettant en oeuvre le procede Download PDF

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Publication number
EP1377734B1
EP1377734B1 EP02708417A EP02708417A EP1377734B1 EP 1377734 B1 EP1377734 B1 EP 1377734B1 EP 02708417 A EP02708417 A EP 02708417A EP 02708417 A EP02708417 A EP 02708417A EP 1377734 B1 EP1377734 B1 EP 1377734B1
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EP
European Patent Office
Prior art keywords
function
manifold
air
engine
pressure
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
EP02708417A
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German (de)
English (en)
French (fr)
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EP1377734A1 (fr
Inventor
Christophe Cazali
Edouard Valanciennes
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.)
Renault SAS
Original Assignee
Renault SAS
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Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP1377734A1 publication Critical patent/EP1377734A1/fr
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Publication of EP1377734B1 publication Critical patent/EP1377734B1/fr
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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
    • F02D41/02—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
    • F02D2200/0408—Estimation of intake manifold pressure

Definitions

  • the present invention relates to a method for calculating the air mass admitted into the cylinder of a combustion engine internal equipment of a motor vehicle and a calculator injection system implementing the method.
  • the method of the invention consists of using the function f bsv to define the throttle flow coefficient, represented graphically as a function of the state variable Xi: by a first horizontal section for the low values of Xi by a third substantially vertical section at the highest values of Xi, and a second monotonic section decreasing at the intermediate values of Xi.
  • the method of the invention consists in using the value of the state variable determined in the preceding cycle to generate a rectified function f red defining the throttle flow coefficient in an approximate manner, by determining the slope (slope ) and the intercept (Y0) of a line segment approaching the curve representative of the real function f bsv so that the value of the state variable Xi can be determined using the relationship :
  • the method of the invention consists in finding, for the real function f bsv, the true value of the state variable (Xi true) which corresponds to the value Xi calculated by the rectified function f red according to the relation connecting the point ( X i , f red ( X i )) with the point ( X i , true , f bsv ( X i , true )).
  • the method of the invention comprises also a step of predicting the air mass deduced from the prediction of manifold pressure.
  • the invention also relates to an injection computer, characterized in that it implements the method according to the invention.
  • FIG. 1 a graph explaining the principle on which the invention is based.
  • the pressure Pcoll pred which corresponds to the sum of the value measured at the time t1 P coll of the pressure at the collector with an increment or decrement ⁇ P coll may not correspond with a point of the real curve of the instantaneous evolution of the pressure at the collector.
  • the first four data are provided to a module 7 which is constituted by a calculator in which is programmed the physical manifold model defined according to the present invention and which is adapted to the controlled engine.
  • the collector model used in the invention is based on the principle of a volume representative of the manifold that is filled by an incoming airflow from upstream with a flow to the Dpap butterfly and which is emptied by a outgoing air flow downstream with a flow rate to the cylinders Dmot.
  • the module 7 comprises means for generating a function representative of the air flow rate at the Dpap butterfly defined by: function dependent essentially for the model considered P coll and in which g is a function representing the aeraulic behavior of the butterfly and f bsv is a function defined in the module 7 by a function generator which is defined according to the curve shown in Figure 3 which will be described later.
  • the function g depends on the parameters S pap . which indicates the section of the butterfly, P upstream and T upstream respectively represent the pressure and the temperature upstream of the butterfly.
  • the function f bsv for defining the flow rate coefficient of the intake throttle depends on the state variable X i representative of the ratio Pcol / Pm of the pressure to the collector referred to the upstream pressure.
  • the graphical representation of the rectifying function f bsv includes a first horizontal section for low values of X i , a third substantially vertical section at the highest values of X i , and a second monotonic section decreasing at intermediate values of X i .
  • the function h also depends on the coefficient rf characteristic of the volumetric efficiency of the heat engine on which the injection computer works.
  • the function f bsv is replaced by a function f red approaching the function f bsv by a succession of predefined line segments.
  • a piece linearization of the function f bsv is performed.
  • the module 7 of collector modeling produces a state variable Xi during the prediction moment t2 of FIG. 1 which is transmitted to the module 8 of the means for calculating the pressure predicted at the collector at the date t3.
  • step (E1) the relevant segment of the rectified function f red (and thus the "slope" and Y0 values of the rectified function f red ) is chosen from the value of the variable X i-1 .
  • the module 7 executing the collector model described above produces a value X i from the value X i-1 acquired previously and which corresponds to the point M i on the representative line f red of the rectified function. Then, out of the loop of the collector model (module 7), we obtain the corresponding point Mi 'on the representative curve f bsv of the real function that the preceding line approaches. For this, the correction module 8 (FIG. 2) makes it possible to produce, during a step (E3) (FIG.
  • a module 9 for calculating the air flow rates to the Dmot motor and the Dpap butterfly which comprises respectively a Dmot function generator and a generator.
  • Dpap function performing the pre-recorded functions g and h described above.
  • the two generators receive as input the calculated values X i true and f bsv (X i, true ) true as well as the value Pamont of the pressure upstream of the butterfly, measured by the sensor 5 or estimated, this value being that which is available at the moment t2 of the prediction of the pressure at the collector.
  • the prediction values Dmot and Dpap of air flow at motor and airflow throttle produced by the module calculation 9 are then transmitted to the input of a last module of calculation 10 of the predicted value of the pressure at the collector which will execute a GP function (Dmot, Dpap, PresMes) by a function generator.
  • the PresMes value is the last available measured value of manifold pressure, measurement made at time t2 of the graph of FIG. corresponding to a value at time t1.
  • the output value of the calculation module 10 represents the prediction of the pressure value at the collector on the date t3 ( Figure 1), so this value, passed on to the rest (no shown) of the injection computer allows the improved calculation the injection air mass for each cylinder of the engine.
  • the invention allows for better dynamic on models of the prior art, particularly because there is no compromise to do with the stability of the model that is acquired by the linear nature of the rectified function f red .
  • the invention makes it possible to carry out a development of the injection calculator facilitated thanks to the stability of the model whatever the load (manifold pressure).
  • the invention makes it possible to reduce, on the solutions of the art previous, the phase shift of the collector model to reality measured physics which ensures a better relevance of the prediction of manifold pressure at time t3.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP02708417A 2001-02-28 2002-02-26 Procede de calcul de la masse d'air admise dans le cylindre d'un moteur a combustion interne equipant un vehicule automobile et calculateur d'injection mettant en oeuvre le procede Expired - Lifetime EP1377734B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0102699 2001-02-28
FR0102699A FR2821388B1 (fr) 2001-02-28 2001-02-28 Procede de calcul de la masse d'air admise dans le cylindre d'un moteur a combustion interne equipant un vehicule automobile et calculateur d'injection mettant en oeuvre le procede
PCT/FR2002/000702 WO2002068806A1 (fr) 2001-02-28 2002-02-26 Procede de calcul de la masse d'air admise dans le cylindre d'un moteur a combustion interne equipant un vehicule automobile et calculateur d'injection mettant en oeuvre le procede

Publications (2)

Publication Number Publication Date
EP1377734A1 EP1377734A1 (fr) 2004-01-07
EP1377734B1 true EP1377734B1 (fr) 2005-08-24

Family

ID=8860533

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02708417A Expired - Lifetime EP1377734B1 (fr) 2001-02-28 2002-02-26 Procede de calcul de la masse d'air admise dans le cylindre d'un moteur a combustion interne equipant un vehicule automobile et calculateur d'injection mettant en oeuvre le procede

Country Status (6)

Country Link
EP (1) EP1377734B1 (es)
JP (1) JP2004528504A (es)
DE (1) DE60205732T2 (es)
ES (1) ES2243696T3 (es)
FR (1) FR2821388B1 (es)
WO (1) WO2002068806A1 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101892914A (zh) * 2010-07-14 2010-11-24 中国第一汽车集团公司 基于模型的发动机瞬态进气量预估方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3900064B2 (ja) * 2002-10-30 2007-04-04 トヨタ自動車株式会社 内燃機関の吸入空気量推定装置
FR2855216B1 (fr) * 2003-05-22 2005-07-01 Renault Sa Procede d'estimation de la pression des gaz dans un collecteur d'admission de moteur a combustion interne et dispositif de commande d'un tel moteur
EP2055918B1 (en) * 2007-10-31 2016-06-01 Fiat Group Automobiles S.p.A. Method and device for estimating the intake air flow rate in an internal combustion engine
FR3027062B1 (fr) 2014-10-09 2016-10-21 Renault Sa Procede de commande d'un moteur a combustion interne muni d'un dispositif de traitement de gaz

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2901613B2 (ja) * 1988-03-25 1999-06-07 富士重工業株式会社 自動車用エンジンの燃料噴射制御装置
US4974563A (en) * 1988-05-23 1990-12-04 Toyota Jidosha Kabushiki Kaisha Apparatus for estimating intake air amount
DE3842075A1 (de) * 1988-12-14 1990-06-21 Bosch Gmbh Robert Verfahren zur kraftstoffmengenbestimmung
US5107815A (en) * 1990-06-22 1992-04-28 Massachusetts Institute Of Technology Variable air/fuel engine control system with closed-loop control around maximum efficiency and combination of otto-diesel throttling
FR2709151B1 (fr) 1993-08-20 1995-09-15 Renault Procédé de calcul de la masse d'air admise dans un moteur à combustion interne.
DE19853410A1 (de) * 1998-11-19 2000-05-25 Bayerische Motoren Werke Ag Verfahren zur Bestimmung des Drosselklappenwinkels

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101892914A (zh) * 2010-07-14 2010-11-24 中国第一汽车集团公司 基于模型的发动机瞬态进气量预估方法
CN101892914B (zh) * 2010-07-14 2015-08-19 中国第一汽车集团公司 基于模型的发动机瞬态进气量预估方法

Also Published As

Publication number Publication date
FR2821388B1 (fr) 2003-04-25
FR2821388A1 (fr) 2002-08-30
DE60205732T2 (de) 2006-06-01
JP2004528504A (ja) 2004-09-16
DE60205732D1 (de) 2005-09-29
WO2002068806A1 (fr) 2002-09-06
EP1377734A1 (fr) 2004-01-07
ES2243696T3 (es) 2005-12-01

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