EP1777397B1 - Verfahren und System zum Schätzen des Druckes im Ansaugkrümmer einer Verbrennungskraftmaschine - Google Patents

Verfahren und System zum Schätzen des Druckes im Ansaugkrümmer einer Verbrennungskraftmaschine Download PDF

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Publication number
EP1777397B1
EP1777397B1 EP06301084A EP06301084A EP1777397B1 EP 1777397 B1 EP1777397 B1 EP 1777397B1 EP 06301084 A EP06301084 A EP 06301084A EP 06301084 A EP06301084 A EP 06301084A EP 1777397 B1 EP1777397 B1 EP 1777397B1
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Prior art keywords
pressure
rfa
cyl
engine
value
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Not-in-force
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EP06301084A
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English (en)
French (fr)
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EP1777397A1 (de
Inventor
Pascal Emery
Stéphane PRADO
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Renault SAS
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Renault SAS
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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
    • 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 the estimation of the pressure prevailing in the intake manifold of an internal combustion engine.
  • the intake pressure is important for engine performance policies. It can still be used for the diagnosis of a good operation of a turbo-compressor, if the internal combustion engine is equipped with it.
  • the intake pressure can of course be measured by a pressure sensor installed in the engine intake manifold. It is an expensive solution.
  • the invention thus aims to provide a method and a device for estimating the intake pressure of an internal combustion engine involving only a minimum of equipment and requiring a very simple calculation of the desired value.
  • a cylinder 1 of an internal combustion engine which may be of the gasoline or diesel type and comprise one or more cylinders.
  • a piston 2 delimiting the combustion chamber 3, a connecting rod 4, a crankshaft 5, a gas intake manifold 6 and a device 7 for exhausting gases.
  • At least one of the cylinders of the engine is also equipped with a sensor 8 continuously measuring the angular position of the crankshaft 5 and a sensor 9 making it possible to measure the In the place of these sensors, it is also possible to provide equivalent means capable of respectively supplying the one and the other parameters.
  • the value ⁇ recorded by the sensor 8 represents the instantaneous angle of the crankshaft 5 and that p ⁇ measured by the sensor 9, the instantaneous pressure in the combustion chamber 3. They are applied to a computing device 10 which can be set up. for example, in the program of the on-board computer of the motor vehicle or in the form of an autonomous computing device.
  • the computing device 10 comprises a functional block 11 which detects a predefined value ⁇ rfa of the angular position of the crankshaft.
  • the instant corresponding to this angular position is chosen close to the closing time rfa of the intake valve (referenced 6a in the figure) during each cycle of the engine.
  • crankshaft angle which is most frequently located in the middle of the point cloud has a value of 195 degrees crankshaft (21) after the top dead center of the cylinder considered (ie 15 ° crankshaft after the bottom dead center as specified upper). It is therefore possible to choose this crank angle value for measuring the pressure in the cylinder in the context of the process according to the invention.
  • the successive predefined values ⁇ rfa determined in the functional block 11 are correlated with the pressure values p ⁇ recorded at the corresponding instants by the sensor 9, which operation is performed by the functional block 12.
  • the pressure value called p cyl rfa is very close to that of the pressure prevailing in the intake manifold 6.
  • the figure 3 is a reading of points giving the value of the collector pressure p col as a function of the value of the pressure in the cylinder P cyl eng for a crankshaft angle of 195 ° after the top dead center of the cylinder considered. It is observed that the relation between the pressure in the cylinder P cyl eng and the collector pressure p col is almost linear.
  • the method according to the invention finally consists, during the operation of each engine concerned in operating the calculation of the pressure in the intake manifold 6, during each combustion cycle, as a function of the pressure value recorded in the combustion chamber. 3. This calculation operation is illustrated in the figure by the function block 13.
  • the method according to the invention thus makes it possible to estimate the value p col of the pressure in the intake manifold 6 of an internal combustion engine by using only very few calculation means and by means of sensors which obviously are usually provided to manage the operation of the engine. It turned out that the thus estimated neck pressure p approaches very close to the values that would be measured in situ in the intake manifold with the aid of a sensor which would be placed specially for this purpose.
  • FIG. 4 is a record of 2500 points 24 representing the relative error between the collector pressure p col estimated by the method according to the invention and a collector pressure measured P mes using a pressure sensor.
  • relative error here refers to the absolute value of the difference between a measured collector pressure P mes by a pressure sensor and the estimated collector pressure p col from the cylinder pressure by means of the process of the invention, all divided by the measured collector pressure value P mes .
  • the figure 4 shows that with the method according to the invention the error made with respect to a collector pressure measured with a pressure sensor is very small.

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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)
  • Measuring Fluid Pressure (AREA)

Claims (5)

  1. Verfahren zum Schätzen des im Ansaugkrümmer (6) eines Verbrennungsmotors herrschenden Drucks, das darin besteht:
    - periodisch den Wert des Drucks in der Brennkammer (3) mindestens eines Zylinders (1) des Motors in Abhängigkeit von der Winkelstellung seiner Kurbelwelle zu erfassen,
    - durch Versuch das Verhältnis zwischen dem zu erhaltenden Druckwert (pcol) und den erfassten Druckwerten (pcylrfa ) zu modellisieren, und
    - den im Krümmer (6) herrschenden Druck (pcol) in Abhängigkeit von dem so erhaltenen Modell für jeden Druckwert (pcylrfa ) zu berechnen, der in der Brennkammer (3) erfasst wird,
    dadurch gekennzeichnet, dass:
    - der Wert des Drucks (pcylrfa ) in der Brennkammer in einem Augenblick des Zyklus des Motors nahe dem Augenblick des Schließens des Ansaugventils (6a) des Zylinders (1) erfasst wird, und
    - der Vorgang der Modellisierung auf der Basis einer Gleichung der Form: p col = A ⋅ p cyl rfa + B
    Figure imgb0009
    durchgeführt wird, in der bedeuten:
    pcol = zu erhaltender Druck,
    pcylrfa = in der Brennkammer erfasster Druck, und
    A und B= experimentell bestimmte Konstanten.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Augenblick, in dem der Druck in der Brennkammer erfasst wird, während des Brennzyklus des Motors der Winkelstellung (θ) von 15° der Kurbelwelle (5) nach dem unteren Totpunkt am Ende des Ansaugens entspricht.
  3. Vorrichtung zur Schätzung des im Ansaugkrümmer (6) eines Verbrennungsmotors herrschenden Drucks, die aufweist:
    Messmittel (8, 9, 11, 12), um periodisch den Druck (pcylrfa ) in der Brennkammer (3) mindestens eines
    Zylinders (1) des Motors in Abhängigkeit von der Winkelstellung seiner Kurbelwelle zu erfassen, und
    Rechenmittel (13), die gemäß einem experimentell bestimmten Modell ein Verhältnis zwischen dem so erfassten Druck (pcylrfa ) und dem zu erhaltenden Druck (pcol) herstellen, diesen in Abhängigkeit von jedem Wert des in der Brennkammer (3) erfassten Drucks berechnen,
    dadurch gekennzeichnet, dass die Messmittel (8, 9, 10, 11) eingerichtet sind, um den Druck (pcylrfa ) in einem Augenblick des Motorzyklus nahe dem Schließzeitpunkt des Ansaugventils (6a) des Zylinders zu erfassen, und dass das in den Rechenmitteln (13) angewendete Modell auf einer Gleichung der Form: p col = A ⋅ p cyl rfa + B
    Figure imgb0010
    beruht, in der bedeuten:
    pcol = zu erhaltender Druck,
    pcylrfa = in der Brennkammer erfasster Druck, und
    A und B = experimentell bestimmte Konstanten.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Messmittel (8, 9, 11, 12) eingerichtet sind, um den Druck in einem Augenblick zu erfassen, der während des Brennzyklus des Motors der Winkelstellung von 15° der Kurbelwelle (5) nach dem unteren Totpunkt am Ende des Ansaugens entspricht.
  5. Verbrennungsmotor, der mit einer Vorrichtung nach einem der Ansprüche 3 und 4 ausgestattet ist.
EP06301084A 2005-10-24 2006-10-24 Verfahren und System zum Schätzen des Druckes im Ansaugkrümmer einer Verbrennungskraftmaschine Not-in-force EP1777397B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0510824A FR2892453B1 (fr) 2005-10-24 2005-10-24 Procede et dispositif pour estimer la pression regnant dans le collecteur d'admission d'un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1777397A1 EP1777397A1 (de) 2007-04-25
EP1777397B1 true EP1777397B1 (de) 2008-12-03

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Application Number Title Priority Date Filing Date
EP06301084A Not-in-force EP1777397B1 (de) 2005-10-24 2006-10-24 Verfahren und System zum Schätzen des Druckes im Ansaugkrümmer einer Verbrennungskraftmaschine

Country Status (4)

Country Link
EP (1) EP1777397B1 (de)
AT (1) ATE416304T1 (de)
DE (1) DE602006003982D1 (de)
FR (1) FR2892453B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2469826B (en) 2009-04-29 2012-11-21 Gm Global Tech Operations Inc Method for estimating the pressure prevailing in an intake manifold of an internal combustion engine and method of controlling an internal combustion engine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6167755B1 (en) * 1993-12-14 2001-01-02 Robert Bosch Gmbh Device for determining load in an internal combustion engine
DE10028886A1 (de) * 2000-06-10 2001-12-13 Volkswagen Ag Verfahren und Vorrichtung zum Überwachen des Betriebs eines Verbrennungsmotors
JP3963171B2 (ja) * 2001-10-15 2007-08-22 トヨタ自動車株式会社 内燃機関の吸入空気量推定装置
GB0227668D0 (en) * 2002-11-27 2003-01-08 Ricardo Consulting Eng Improved engine management
JP4321294B2 (ja) * 2004-02-18 2009-08-26 日産自動車株式会社 内燃機関のシリンダ吸入空気量算出装置
FR2871521B1 (fr) * 2004-06-11 2008-08-01 Peugeot Citroen Automobiles Sa Systeme d'estimation de la pression dans le collecteur d'echappement d'un moteur diesel et procede de calibrage de ce systeme

Also Published As

Publication number Publication date
DE602006003982D1 (de) 2009-01-15
FR2892453A1 (fr) 2007-04-27
EP1777397A1 (de) 2007-04-25
FR2892453B1 (fr) 2010-12-17
ATE416304T1 (de) 2008-12-15

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