EP1062416B1 - Procede de calcul de la pression moyenne indiquee d'un moteur a combustion interne - Google Patents
Procede de calcul de la pression moyenne indiquee d'un moteur a combustion interne Download PDFInfo
- Publication number
- EP1062416B1 EP1062416B1 EP99907695A EP99907695A EP1062416B1 EP 1062416 B1 EP1062416 B1 EP 1062416B1 EP 99907695 A EP99907695 A EP 99907695A EP 99907695 A EP99907695 A EP 99907695A EP 1062416 B1 EP1062416 B1 EP 1062416B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pmi
- advance
- richness
- engine
- equal
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000002485 combustion reaction Methods 0.000 title description 7
- 238000005259 measurement Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 3
- 238000013507 mapping Methods 0.000 description 5
- 101100537665 Trypanosoma cruzi TOR gene Proteins 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
- F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
-
- 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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
-
- 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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1497—With detection of the mechanical response of the engine
-
- 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
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
- F02D2200/1004—Estimation of the output torque
Definitions
- the present invention relates to the field of motors with internal combustion in which the increase in quality requirements of operation associated with the development of control means and regulation requires increasingly precise control of operation overall of these motors (see for example FR-A-2 688 546 and EP-A-742359).
- the engine control and regulation means can include richness sensors, a motorized intake throttle, a full electronic ignition, etc.
- knowledge of gross engine torque as a function of operating parameters applied such as richness, speed, air charge and ignition advance, can be used to anticipate the command (s) to use in order to correctly regulate engine operation taking into account accessories with which the vehicle is fitted and which must be supplied with energy, directly or indirectly, from the engine such as air conditioning, power steering, automatic transmission, anti-skid system and trajectory control, etc.
- the effective engine torque at optimal advance is defined as a mapping depending on the speed and pressure of the manifold. This torque is then increased by the friction couple thanks to a speed-dependent table to obtain the indicated gas torque and which will then be corrected by a single advance yield. This couple gas is again reduced by friction losses for finally obtain the effective torque corresponding to the advance setting adopted.
- the object of the present invention is to remedy the drawbacks of the methods proposed above using an advance yield particularly precisely defined.
- the method for estimating the torque of a spark-ignition engine according to the invention is carried out by calculating the average pressure indicated by the positive loop of the pressure cycle in the cylinder as a function of the volume of said cylinder, the positive loop being the part of the curve representative of the operation of the engine when the valves of said engine are closed. This estimate is made as a function of the air flow entering the engine, the pressure in the engine manifold, the operating speed N, the ignition advance AV, and the apparent richness of combustion Ri.
- the richness coefficient ⁇ Ri is equal to 1 if the richness Ri is equal to 1, the richness coefficient ⁇ Ri being a variable dependent on the richness Ri.
- the evolution of PMI + as a function of the advance is modeled by a second degree curve approaching the points actually measured.
- the points actually measured are weighted, a greater weight A being accorded to the measurement points closest to the value of the optimal advance, according to the following equation:
- a (i) A min + ( PMI + (i) - PMI + min ) x (A max - A min ) / (PMI + max - PMI + min ),
- a min being the minimum weight associated with the minimum measured value of the indicated average pressure PMI +
- a max being the maximum weight associated with the maximum measured value of the average pressure indicated PMI +, using a minimization criterion: Min [ ⁇ i A (i) 2 x (PMI + (i) mes - PMI + (i) calc) 2 ];
- i being the number of measurements for a curve
- PMI + (i) mes being the average pressure indicated PMI + measured at point i
- PMI + (i) calc being the average pressure indicated PMI + calculated at point i according to the modeling curve.
- the work that can be recovered in the form of energy mechanical is therefore equal to the indicated average pressure of the loop positive PMI + from which the indicated average pressure of the negative loop PMI- and the average pressure of PMF friction.
- the richness coefficient ⁇ Ri 1 when the richness Ri is equal to 1.
- the coefficient K is a representative map of the combustion efficiency of the engine at unit richness.
- the advance yield ⁇ AV characterizes the change in the indicated average pressure of the positive PMI + loop as a function of the ignition advance.
- the formulation used to estimate the indicated average pressure of the loop positive PMI + involves the optimal AVopt advances of the various engine operating points. It should be possible to characterize precisely all of these optimal advances. Their determination takes place mainly in the flattest part of the curve called hat in advance due to its shape.
- the overall minimization criterion adopted involves sub-criteria applying to deviations in curvature, optimal advance and value of the indicated average pressure of the positive PMI + loop.
- CRIT (curve) min [b x ⁇ abs (1 - curvature (k) calc / curvature (k) mes)]; k being the number of bending caps.
- CRIT (curve) min [b x ⁇ abs (1 - curvature (k) calc / curvature (k) mes)]; k being the number of bending caps.
- the torque value is developed from the average pressure exerted PME in the engine; the value of the average pressure exerted being obtained from the exhaust pressure and the outputs of a gearbox whose operation is illustrated in Figure 5, and of the engine speed N.
- the exhaust pressure is calculated from the amount of air entering the engine Q r expressed in kilograms / second.
- the torque box provides the values of the manifold pressure P col , the indicated average pressure of the positive loop PMI +, the advance efficiency ⁇ AV , the richness coefficient ⁇ Ri and the mean PMF operating pressure of the engine.
- the value of the PMI + is obtained as explained above by a weighting taking into account the values of the quantity of air entering the engine Q r in grams per revolution, of a mapping of the coefficient K as a function of the manifold pressure P col and of the operating regime N with unit richness, of the advance efficiency ⁇ AV and of the richness coefficient ⁇ Ri
- the obtaining of the value of the advance efficiency ⁇ AV is illustrated in FIG. 6.
- the representative curve of richness coefficient ⁇ Ri is obtained from the value of the wealth Ri.
- the average operating pressure PMF is calculated from the operating speed N.
- the quantity of air Q r in grams per revolution is calculated from the quantity of air in kg / s and the operating speed N.
- the yield of advance ⁇ AV is worked out starting from the influence of the richness on the curvatures of the caps modeled h (Ri), of the advance AV, of the table of curvatures hats modeled f (AVopt) and optimal advances AVopt (Ri).
- the function h (Ri) is developed from the value of the richness Ri.
- the calculation of the table of curvatures of the caps modeled f (AVopt) and of the optimal advances AVopt (Ri) is carried out from the maps established for a unit richness and for a richness less than 1, for example equal to 0.68, in function of the operating regime N and of the manifold pressure P col , and of the variable P depending on the richness Ri.
Landscapes
- 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)
Abstract
Description
- g (Ri) : table des rendements de richesse ;
- f (AVopt) : table des courbures des chapeaux modélisés et fonction de l'avance optimale ;
- h (Ri) : influence de la richesse sur les courbures des chapeaux modélisés.
Claims (5)
- Procédé d'estimation du couple d'un moteur à allumage commandé par calcul de la pression moyenne indiquée par la boucle positive du cycle de pression dans le cylindre en fonction du volume du dit cylindre, la boucle positive étant la partie de la courbe représentative du fonctionnement du moteur lorsque les soupapes sont fermées, en fonction du débit d'air entrant dans le moteur, de la pression dans le collecteur du moteur, du régime de fonctionnement N, de l'avance à l'allumage, et de la richesse de fonctionnement, la pression moyenne indiquée de la boucle positive PMI+ étant égale au produit de la pression moyenne indiquée de la boucle positive pour une richesse égale à 1 et à l'avance optimale PMI+opt,Ri=1, par le coefficient de richesse πRi et par le rendement d'avance πav, la pression moyenne indiquée de la boucle positive pour une richesse égale à 1 et à l'avance optimale étant égale au produit de la quantité d'air entrant dans le moteur par un coefficient K dépendant de la pression collecteur et du régime de fonctionnement N.
- Procédé selon la revendication 1, caractérisé par le fait que le coefficient de richesse πRi est égal à 1 si la richesse Ri est égale à 1, le coefficient de richesse πRi étant une variable dépendant de la richesse Ri.
- Procédé selon la revendication 1 ou 2, caractérisé par le fait que le rendement d'avance πav dépend d'une variable P qui obéit à une régression polynomiale du second degré fonction de l'écart entre l'avance optimale du point de fonctionnement et l'avance appliquée et dont la courbure est fonction de la valeur de l'avance optimale et de la richesse Ri, avec πav = 1-P*(AV-AVopt)2.
- Procédé selon la revendication 3, caractérisé par le fait que l'évolution de l'avance optimale de la boucle positive en fonction de l'avance est modélisée par une courbe du second degré approchant les points réellement mesurés.
- Procédé selon la revendication 4, caractérisé par le fait qu'on effectue une pondération des points réellement mesurés, un poids A plus important étant accordé aux points de mesure les plus proches de l'avance optimale expérimentale, selon l'équation suivante : A(i) = Amin + (PMI+(i) - PMI+min) * (Amax - Amin) / (PMI+max - PMI+min), Amin étant le poids minimum associé à la valeur minimum mesurée de la PMI+, Amax étant le poids maximum associé à la valeur maximum mesurée de la PMI+, en utilisant un critère de minimisation : Min [ΣiA(i)2 * (PMI+(i)mes - PMI+(i)calc)2] ; i étant le nombre de mesures pour une courbe, PMI+(i)mes étant la PMI+ mesurée au point i, et PMI+(i)calc étant la PMI+ calculée au point i selon la courbe de modélisation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9803068A FR2776066B1 (fr) | 1998-03-12 | 1998-03-12 | Procede de calcul de la pression moyenne indiquee d'un moteur a combustion interne |
| FR9803068 | 1998-03-12 | ||
| PCT/FR1999/000554 WO1999046497A1 (fr) | 1998-03-12 | 1999-03-12 | Procede de calcul de la pression moyenne indiquee d'un moteur a combustion interne |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1062416A1 EP1062416A1 (fr) | 2000-12-27 |
| EP1062416B1 true EP1062416B1 (fr) | 2002-05-22 |
Family
ID=9523987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99907695A Expired - Lifetime EP1062416B1 (fr) | 1998-03-12 | 1999-03-12 | Procede de calcul de la pression moyenne indiquee d'un moteur a combustion interne |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1062416B1 (fr) |
| JP (1) | JP4299460B2 (fr) |
| DE (1) | DE69901547T2 (fr) |
| FR (1) | FR2776066B1 (fr) |
| WO (1) | WO1999046497A1 (fr) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2837528B1 (fr) * | 2002-03-21 | 2004-06-04 | Renault | Procede d'estimation du couple de pompage d'un moteur thermique pour vehicule automobile |
| US7127346B1 (en) * | 2005-06-23 | 2006-10-24 | Gm Global Technology Operations, Inc. | Dynamic engine pumping work estimation algorithm |
| DE102013005655B9 (de) * | 2013-04-04 | 2014-07-31 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Verfahren zur Bestimmung des indizierten Mitteldruckes in der Hochdruckphase beim Betrieb einer Brennkraftmaschine |
| FR3053118B1 (fr) * | 2016-06-23 | 2018-06-22 | Renault S.A.S | Procede de determination de l'avance a l'allumage d'un moteur a combustion interne et procede de controle d'un moteur utilisant un tel procede |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR930000007B1 (ko) * | 1988-06-08 | 1993-01-06 | 미쯔비시 덴끼 가부시끼가이샤 | 내연기관의 제어 장치 |
| FR2681908A1 (fr) * | 1991-09-27 | 1993-04-02 | Peugeot | Procede de correction des parametres de controle d'un moteur a combustion interne et dispositif de mise en óoeuvre du procede. |
| FR2688546B1 (fr) * | 1992-03-10 | 1996-03-01 | Siemens Automotive Sa | Procede et dispositif de commande d'un moteur a combustion interne. |
| FR2711185B1 (fr) * | 1993-10-12 | 1996-01-05 | Inst Francais Du Petrole | Système d'acquisition et de traitement instantané de données pour le contrôle d'un moteur à combustion interne. |
| US5715794A (en) * | 1995-05-12 | 1998-02-10 | Yamaha Hatsudoki Kabushiki Kaisha | Engine control system and method |
| DE19517673A1 (de) * | 1995-05-13 | 1996-11-14 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Steuerung des Drehmoments einer Brennkraftmaschine |
-
1998
- 1998-03-12 FR FR9803068A patent/FR2776066B1/fr not_active Expired - Fee Related
-
1999
- 1999-03-12 EP EP99907695A patent/EP1062416B1/fr not_active Expired - Lifetime
- 1999-03-12 DE DE69901547T patent/DE69901547T2/de not_active Expired - Lifetime
- 1999-03-12 JP JP2000535839A patent/JP4299460B2/ja not_active Expired - Fee Related
- 1999-03-12 WO PCT/FR1999/000554 patent/WO1999046497A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002506169A (ja) | 2002-02-26 |
| DE69901547T2 (de) | 2002-11-28 |
| EP1062416A1 (fr) | 2000-12-27 |
| WO1999046497A1 (fr) | 1999-09-16 |
| JP4299460B2 (ja) | 2009-07-22 |
| FR2776066A1 (fr) | 1999-09-17 |
| FR2776066B1 (fr) | 2000-06-30 |
| DE69901547D1 (de) | 2002-06-27 |
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