EP1777397B1 - Method and system for estimating pressure in the intake manifold of an internal combustion engine - Google Patents
Method and system for estimating pressure in the intake manifold of an internal combustion engine Download PDFInfo
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- rfa
- cyl
- engine
- value
- 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.)
- Not-in-force
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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
- 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)
- Measuring Fluid Pressure (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
La présente invention est relative à l'estimation de la pression régnant dans le collecteur d'admission d'un moteur à combustion interne.The present invention relates to the estimation of the pressure prevailing in the intake manifold of an internal combustion engine.
L'un des paramètres importants permettant de faire fonctionner les dispositifs antipollution de tels moteurs dans les véhicules automobiles est la pression d'admission, car il permet de déterminer la masse d'air aspirée par le moteur. Ce paramètre est également important dans le cadre des stratégies sur les performances du moteur. Il peut encore servir pour le diagnostic de bon fonctionnement d'un turbo-compresseur, si le moteur à combustion interne en est équipé.One of the important parameters for operating the anti-pollution devices of such engines in motor vehicles is the intake pressure, because it allows to determine the mass of air sucked by the engine. This setting is also 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.
La pression d'admission peut naturellement être mesurée par un capteur de pression installé dans la tubulure d'admission du moteur. C'est une solution coûteuse.The intake pressure can of course be measured by a pressure sensor installed in the engine intake manifold. It is an expensive solution.
On a donc déjà pensé à obtenir le paramètre d'une autre façon. C'est ainsi par exemple qu'il est connu par
Cependant, bien que cette méthode de détermination de la pression d'admission donne de bons résultats, elle s'avère être relativement compliquée en particulier en ce qui concerne l'établissement de la valeur du débit de gaz dans le moteur. Elle implique également des moyens de calcul assez importants.However, although this method of determining the inlet pressure gives good results, it turns out to be relatively complicated especially with regard to the establishment of the value of the gas flow in the engine. It also involves fairly important calculation means.
L'invention a ainsi pour but de fournir un procédé et un dispositif pour estimer la pression d'admission d'un moteur à combustion interne ne mettant en jeu qu'un minimum de matériel et nécessitant un calcul très simple de la valeur recherchée.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.
L'invention a donc principalement pour objet un procédé pour déterminer la pression régnant dans le collecteur d'admission d'un moteur à combustion interne remarquable en ce qu'il consiste:
- à relever périodiquement la valeur de la pression dans la chambre de combustion d'au moins un cylindre dudit moteur à un instant du cycle moteur proche de l'instant de fermeture de la soupape d'admission dudit cylindre,
- à modéliser par l'expérimentation le rapport entre la valeur de pression à obtenir et les valeurs de pression relevées, et
- à calculer la pression régnant dans ledit collecteur en fonction du modèle ainsi obtenu pour chaque valeur de pression relevée dans ladite chambre de combustion.
- periodically reading the value of the pressure in the combustion chamber of at least one cylinder of said engine at a time of the engine cycle close to the closing time of the intake valve of said cylinder,
- to model by experimentation the ratio between the pressure value to be obtained and the pressure values recorded, and
- calculating the pressure prevailing in said manifold according to the model thus obtained for each pressure value recorded in said combustion chamber.
Grâce à ces caractéristiques, il devient possible d'estimer avec une très bonne approximation la pression dans le collecteur d'admission du moteur sans qu'il soit nécessaire de prévoir un capteur coûteux dans ce collecteur. En effet, pour déterminer ainsi la pression dans le collecteur, on peut faire appel à d'autres capteurs déjà habituellement prévus pour assurer la gestion du moteur, tandis que les moyens de calcul nécessaires sont des plus simples.Thanks to these characteristics, it becomes possible to estimate with a very good approximation the pressure in the intake manifold of the engine without the need to provide an expensive sensor in this manifold. Indeed, to thus determine the pressure in the manifold, one can use other sensors already usually provided for the management of the engine, while the necessary calculation means are very simple.
Selon d'autres caractéristiques avantageuses de ce procédé:
- l'opération de modélisation est réalisée sur la base d'une équation de la forme
- pcol =
- pression à obtenir
- pcyl
rfa = - pression relevée dans la chambre de combustion
- A et B =
- constantes déterminées expérimentalement
- l'instant auquel est relevée ladite pression dans la chambre de combustion au cours du cycle de combustion dudit moteur, correspond de préférence à la position angulaire de 15° du vilebrequin après le point mort bas en fin d'admission.
- the modeling operation is performed on the basis of an equation of the form
- p col =
- pressure to get
- p cyl
rfa = - pressure in the combustion chamber
- A and B =
- Experimentally determined constants
- the moment at which said pressure is noted in the combustion chamber during the combustion cycle of said engine, preferably corresponds to the angular position of 15 ° of the crankshaft after the bottom dead center at the end of admission.
L'invention a également pour objet un dispositif pour estimer la pression régnant dans le collecteur d'admission d'un moteur à combustion interne, remarquable en ce qu'il comprend:
- des moyens pour relever la pression dans la chambre de combustion d'au moins un cylindre dudit moteur à un instant du cycle moteur proche de l'instant de fermeture de la soupape d'admission dudit cylindre, et
- des moyens de calcul qui, d'après un modèle déterminé expérimentalement établissent un rapport entre la pression ainsi relevée et la pression à obtenir, calculent celle-ci en fonction de chaque valeur de la pression relevée dans la chambre de combustion.
- means for measuring the pressure in the combustion chamber of at least one cylinder of said engine at a time of the engine cycle close to the closing time of the intake valve of said cylinder, and
- calculation means which, according to an experimentally determined model, establish a ratio between the pressure thus measured and the pressure to be obtained, calculate this pressure as a function of each value of the pressure recorded in the combustion chamber.
Selon d'autres caractéristiques avantageuses de ce dispositif:
- le modèle mis en oeuvre dans lesdits moyens de calcul est basé sur une équation de la forme:
- pcol =
- pression à obtenir
- pcyl
rfa = - pression relevée dans la chambre de combustion
- A et B =
- constantes déterminées expérimentalement
- lesdits moyens de mesure sont agencés pour relever ladite pression à un instant au cours du cycle de combustion dudit moteur, qui correspond de préférence à la position angulaire de 15° du vilebrequin après le point mort bas en fin d'admission.
- the model implemented in said calculation means is based on an equation of the form:
- p col =
- pressure to get
- p cyl
rfa = - pressure in the combustion chamber
- A and B =
- Experimentally determined constants
- said measuring means are arranged to raise said pressure at a time during the combustion cycle of said engine, which preferably corresponds to the angular position of 15 ° of the crankshaft after the bottom dead center at the end of admission.
D'autres caractéristiques et avantages de l'invention apparaîtront au cours de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant au dessin annexé sur lequel:
- la
figure 1 est une illustration symbolique de la mise en oeuvre du procédé et du dispositif selon l'invention. - la
figure 2 est un relevé de points donnant les angles vilebrequin pour lesquels la valeur absolue de la différence entre la pression dans le cylindre et la pression dans le collecteur d'admission est inférieure à une seuil prédéterminé. - la
figure 3 est un relevé de points donnant la pression dans le collecteur d'admission, déterminée grâce au procédé selon l'invention en fonction de la pression dans le cylindre. - la
figure 4 est un relevé de points donnant pour chaque point l'erreur relative entre une pression collecteur mesurée par un capteur de pression et une pression estimée par le procédé selon l'invention.
- the
figure 1 is a symbolic illustration of the implementation of the method and the device according to the invention. - the
figure 2 is a survey of points giving the crank angles for which the absolute value of the difference between the pressure in the cylinder and the pressure in the intake manifold is below a predetermined threshold. - the
figure 3 is a record of points giving the pressure in the intake manifold determined by the method according to the invention as a function of the pressure in the cylinder. - the
figure 4 is a record of points giving for each point the relative error between a manifold pressure measured by a pressure sensor and a pressure estimated by the method according to the invention.
En se reportant à la
Sont également représentés un piston 2 délimitant la chambre de combustion 3, une bielle 4, un vilebrequin 5, un collecteur d'admission des gaz 6 et un dispositif 7 d'échappement des gaz.Also shown are a
Selon l'exemple de réalisation représenté, au moins l'un des cylindres du moteur est également équipé d'un capteur 8 mesurant en permanence la position angulaire du vilebrequin 5 et d'un capteur 9 permettant de mesurer la pression dans la chambre de combustion 3. A la place de ces capteurs, on peut également prévoir des moyens équivalents capables de fournir respectivement l'un et l'autre paramètres.According to the exemplary embodiment shown, at least one of the cylinders of the engine is also equipped with a
La valeur θ relevée par le capteur 8 représente l'angle instantané du vilebrequin 5 et celle pθ relevée par le capteur 9, la pression instantanée dans la chambre de combustion 3. Elles sont appliquées à un dispositif de calcul 10 qui peut être mis en oeuvre par exemple au sein du programme du calculateur de bord du véhicule automobile ou être réalisé sous la forme d'un dispositif de calcul autonome.The value θ recorded by the
Le dispositif de calcul 10 comprend un bloc fonctionnel 11 qui détecte une valeur prédéfinie θrfa de la position angulaire du vilebrequin. L'instant correspondant à cette position angulaire est choisi proche de l'instant de fermeture rfa de la soupape d'admission (référencée 6a sur la figure) au cours de chaque cycle du moteur. A titre d'exemple, on peut choisir la position angulaire de 15° du vilebrequin après le point mort bas en fin d'admission.The
On se reporte à la
Les valeurs prédéfinies successives θrfa déterminées dans le bloc fonctionnel 11 sont corrélées avec les valeurs de pression pθ relevées aux instants correspondants par le capteur 9, opération qui est effectuée par le bloc fonctionnel 12. La valeur de pression appelée pcyl
Pour calculer la valeur de la pression recherchée, on établit au préalable un modèle du rapport entre la pression pcyl
La
La modélisation est donc faite de préférence sur la base d'une équation de la forme:
dans laquelle A et B sont des constantes déterminées à calibrer expérimentalement lors de la modélisation et la courbe de cette équation est la droite 23 de la
A=0,98 et
B=2526The modeling is therefore preferably done on the basis of an equation of the form:
in which A and B are determined constants to be calibrated experimentally during the modeling and the curve of this equation is the
A = 0.98 and
B = 2526
Le procédé selon l'invention consiste enfin lors du fonctionnement de chaque moteur concerné à opérer le calcul de la pression dans le collecteur d'admission 6, au cours de chaque cycle de combustion, en fonction de la valeur de pression relevée dans la chambre de combustion 3. Cette opération de calcul est illustrée sur la figure par le bloc fonctionnel 13.The method according to the invention finally consists, during the operation of each engine concerned in operating the calculation of the pressure in the
Le procédé selon l'invention permet ainsi d'estimer la valeur pcol de la pression dans le collecteur d'admission 6 d'un moteur à combustion interne en ne mettant en oeuvre que très peu de moyens de calcul et moyennant des capteurs qui de toute manière sont prévus habituellement pour gérer le fonctionnement du moteur. Il s'est avéré que la pression pcol ainsi estimée se rapproche de très près des valeurs qui seraient mesurées in situ dans le collecteur d'admission à l'aide d'un capteur qui y serait spécialement placé à cet effet.The method according to the invention thus makes it possible to estimate the value p col of the pressure in the
En effet, la
On entend ici par erreur relative ε la valeur absolue de la différence entre une pression collecteur mesurée Pmes par un capteur de pression et la pression collecteur estimée pcol à partir de la pression cylindre grâce au procédé de l'invention, le tout divisé par la valeur de pression collecteur mesurée Pmes. La
De plus, grâce à l'invention, on peut faire l'économie d'un capteur de pression.In addition, thanks to the invention, it can save a pressure sensor.
Claims (5)
- Method for estimating the pressure prevailing in the intake manifold (6) of an internal combustion engine, which involves:- periodically recording the value of the pressure in the combustion chamber (3) of at least one cylinder (1) of the said engine as a function of the angular position of its crankshaft,- modelling by experimentation the ratio between the pressure value to be obtained (pcol) and the recorded pressure values (pcyl
rfa ), and- calculating the pressure (pcol) prevailing in the said manifold (6) as a function of the model thus obtained for each pressure value (pcylcharacterized in that:rfa ) recorded in the said combustion chamber (3),- the value of the pressure (pcylin which:rfa ) in the said combustion chamber is recorded at an instant of the engine cycle close to the instant of closure of the intake valve (6a) of the said cylinder (1), andpcol = pressure to be obtained,pcylrfa = pressure recorded in the combustion chamber, andA and B = experimentally determined constants. - Method according to Claim 1, characterized in that the instant at which the said pressure in the combustion chamber is recorded corresponds, during the combustion cycle of the said engine, to the angular position (θ) of 15° of the crankshaft (5) after bottom dead centre at the end of intake.
- Device for estimating the pressure prevailing in the intake manifold (6) of an internal combustion engine, comprising:measuring means (8, 9, 11, 12) for periodically recording the pressure (pcyl
rfa ) in the combustion chamber (3) of at least one cylinder (1) of the said engine as a function of the angular position of its crankshaft, andcalculating means (13) which, using an experimentally determined model, establish a ratio between the pressure thus recorded (pcylrfa ) and the pressure to beobtained (pcol) and calculate the latter pressure as a function of each value of the pressure recorded in the combustion chamber (3),characterized in that the said measuring means (8, 9, 10, 11) are designed to record the said pressure (pcylrfa ) at an instant of the engine cycle close to the instant of closure of the intake valve (6a) of the said cylinder, and in that the model employed in the said calculating means (13) is based on an equation of the form:
in which:pcol = pressure to be obtained,pcylrfa = pressure recorded in the combustion chamber, andA and B = experimentally determined constants. - Device according to Claim 3, characterized in that the said measuring means (8, 9, 11, 12) are designed to record the said pressure at an instant which corresponds, during the combustion cycle of the said engine, to the angular position of 15° of the crankshaft (5) after bottom dead centre at the end of intake.
- Internal combustion engine equipped with a device according to either one of Claims 3 and 4.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0510824A FR2892453B1 (en) | 2005-10-24 | 2005-10-24 | METHOD AND DEVICE FOR ESTIMATING REGULATING PRESSURE IN THE INTAKE MANIFOLD OF AN INTERNAL COMBUSTION ENGINE |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1777397A1 EP1777397A1 (en) | 2007-04-25 |
EP1777397B1 true EP1777397B1 (en) | 2008-12-03 |
Family
ID=36593721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06301084A Not-in-force EP1777397B1 (en) | 2005-10-24 | 2006-10-24 | Method and system for estimating pressure in the intake manifold of an internal combustion engine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1777397B1 (en) |
AT (1) | ATE416304T1 (en) |
DE (1) | DE602006003982D1 (en) |
FR (1) | FR2892453B1 (en) |
Families Citing this family (1)
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)
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 (en) * | 2000-06-10 | 2001-12-13 | Volkswagen Ag | Method and device for monitoring the operation of an internal combustion engine |
US7200486B2 (en) * | 2001-10-15 | 2007-04-03 | Toyota Jidosha Kabushiki Kaisha | Apparatus for estimating quantity of intake air for internal combustion engine |
GB0227668D0 (en) * | 2002-11-27 | 2003-01-08 | Ricardo Consulting Eng | Improved engine management |
JP4321294B2 (en) * | 2004-02-18 | 2009-08-26 | 日産自動車株式会社 | Cylinder intake air amount calculation device for internal combustion engine |
FR2871521B1 (en) * | 2004-06-11 | 2008-08-01 | Peugeot Citroen Automobiles Sa | SYSTEM FOR ESTIMATING PRESSURE IN THE EXHAUST MANIFOLD OF A DIESEL ENGINE AND METHOD OF CALIBRATING IT |
-
2005
- 2005-10-24 FR FR0510824A patent/FR2892453B1/en not_active Expired - Fee Related
-
2006
- 2006-10-24 AT AT06301084T patent/ATE416304T1/en not_active IP Right Cessation
- 2006-10-24 DE DE602006003982T patent/DE602006003982D1/en active Active
- 2006-10-24 EP EP06301084A patent/EP1777397B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
FR2892453B1 (en) | 2010-12-17 |
FR2892453A1 (en) | 2007-04-27 |
EP1777397A1 (en) | 2007-04-25 |
ATE416304T1 (en) | 2008-12-15 |
DE602006003982D1 (en) | 2009-01-15 |
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