EP1218629B1 - Procede de mesure de la pression de carburant dans une rampe a injection d'un moteur a combustion interne - Google Patents
Procede de mesure de la pression de carburant dans une rampe a injection d'un moteur a combustion interne Download PDFInfo
- Publication number
- EP1218629B1 EP1218629B1 EP00967963A EP00967963A EP1218629B1 EP 1218629 B1 EP1218629 B1 EP 1218629B1 EP 00967963 A EP00967963 A EP 00967963A EP 00967963 A EP00967963 A EP 00967963A EP 1218629 B1 EP1218629 B1 EP 1218629B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- fuel
- injector
- opening time
- opening
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 64
- 238000002347 injection Methods 0.000 title claims abstract description 12
- 239000007924 injection Substances 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 20
- 238000002485 combustion reaction Methods 0.000 title claims description 10
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000005070 sampling Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000009530 blood pressure measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000037213 diet Effects 0.000 description 1
- 235000005911 diet Nutrition 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/04—Fuel pressure pulsation in common rails
Definitions
- the present invention relates to a method of measurement of the fuel pressure prevailing in a electromagnetic injector of this fuel in one of the cylinders of an internal combustion injection engine direct, the injectors associated with said cylinders being fueled by a fuel rail ses and their opening time calculated and ordered by a calculator.
- a fuel supply device for an internal combustion engine with direct injection of a known type comprising a fuel tank 1, a pump 2 supplied by the tank 1 and associated to a pressure regulator 3 for delivering fuel to a second pump 5, through a filter 4, the fuel delivered by the pump 2 being brought to a first pressure level higher than atmospheric pressure, but relatively low, whence the name of "low pressure pump” given to pump 2.
- the second pump 5 still raises the fuel pressure to a second level higher than the first, suitable for supplying fuel injectors 6 1 , 6 2 , 6 3 , 6 4 mounted on a ramp 7 for supplying fuel to the cylinders of an internal combustion engine with direct injection (not shown).
- the pressure of the fuel delivered by the pump 5, called “high pressure pump”, is fixed by an electromechanical regulator 8, such as a solenoid valve controlled by a computer 9.
- a sensor 10 delivers to the computer 9 a signal representative of the pressure of the fuel contained in the rail 7, to allow the computer to regulate the fuel pressure in this rail at the required predetermined level.
- the computer 9 is commonly constituted by the engine operating management computer, controlling among other things the injectors 6 i (i from 1 to 4 in the example shown), and in particular the opening time of these.
- the fuel not delivered by the injectors 6 i is returned to the tank via a pipe 11, 12 placed at atmospheric pressure.
- the amount of fuel to be injected by a particular injector in the associated cylinder of the engine is calculated by the computer 9 according to a number of well known parameters.
- the calculator also determines the opening time of the injector which is suitable for ensuring entry into the cylinder of a predetermined amount of fuel. This opening time is a function of this quantity but also of the pressure of fuel prevailing in the ramp 7, pressure which fluctuates over time despite the presence of the regulator 8.
- this one can be constituted by a solenoid valve controlled by the computer 9, to establish a discontinuous leak of fuel, suitable for regulating the pressure of fuel at a predetermined level.
- FIG. 2 there is shown in 6 i the opening timing diagram of the injector 6 i considered, for a time T i , and in P, the graph of the fuel pressure P in the ramp, observed during and around the opening of this injector.
- this process requires that a measurement be made continuous fuel pressure in the rail or, at least, that this measurement is carried out with a very high sampling frequency, compatible with the very short opening time of the injectors (a few ms).
- the opening of an electromagnetic injector requires high current generator of strong electromagnetic disturbances likely to distort the measurement signal emitted by the pressure sensor 10 during this opening.
- the object of the present invention is to provide a process for accurately measuring the fuel pressure prevailing in an injector of this fuel in an internal combustion injection engine direct, this process does not have the disadvantages known methods of the prior art mentioned above.
- the present invention aims to providing such a method which authorizes the use of a measure pressure at current sampling frequency, all being insensitive to electromagnetic disturbances prevailing in the environment of the pressure sensor used.
- This object of the invention is achieved, as well as other which will appear on reading the description which will follow, with a process for measuring the pressure of fuel prevailing in an electromagnetic injector of this fuel in one of the cylinders of a internal combustion with direct injection, injectors associated with said cylinders being supplied with fuel by a common power rail and their time calculated and controlled by a computer, this process being remarkable in that a) a possible overlap of opening times of at least two of said injectors, b) in the absence of such recovery, the fuel pressure in the ramps outside the injector opening time considered, c) in the presence of such an overlap, reads fuel pressure when opening the injector considered, and d) the measurement taken is corrected based on a predetermined variation in pressure fuel, induced by the opening of the injectors.
- this process allows, from a reliable pressure measurement, because not disturbed, to know precisely the pressure mean prevailing in a fuel injector when it dispenses fuel. We can then adjust with precision the opening time of the injector, specific to make him charge a specific amount of fuel by the calculator.
- step d) above we subtract from the measurement read a decrement depending on the pressure measured and / or an estimate of the opening time of the injector.
- the invention will be described in its application to the control of an internal combustion engine with direct injection having four cylinders supplied respectively by the injectors 6 1 , 6 2 , 6 3 and 6 4 .
- the sensor 10 delivers to the computer (9) an electrical signal containing a measurement of the fuel pressure in the rail 7.
- the strong electromagnetic field which results therefrom is likely to disturb the relatively weak electrical signal emitted by the sensor, and therefore to distort the pressure measurement taken into account by the computer ( 9) to adjust the opening time T i of the injector, as a function of a predetermined quantity of petrol to be injected into the associated cylinder of the engine, this quantity obviously being a function of the fuel pressure and of this time d 'opening.
- this is overcome disadvantage by not taking into account, in fuel pressure assessment, measurements thus distorted and by carrying out this evaluation by correction of a reliable measurement.
- the computer (9) eliminates from its calculations the pressure measurement samples taken during the opening time T i of the injector.
- the samples taken immediately after removal of the injector are likewise eliminated, for an additional time interval ⁇ t suitable for allowing the sensor 10 to again deliver undisturbed and restabilized pressure samples.
- the pressure to be taken into account is then calculated by the computer 9 from a pressure sample acquired, for example, prior to the instant t 0 of opening of the injector, and corrected by decrementing the value thus acquired suitably. to take account of the fact that, during the opening time T 1 of the injector, the average fuel pressure is lowered compared to the pressure measured before the opening of the injector.
- the amplitude of the decrement to be applied to the measurement can be evaluated by bench measurements. It is a function, in particular, of the level of the pressure P measured prior to opening, and / or of an estimate of the opening time of the injector, an estimate obtained for example by calculating a basic opening time at the set pressure applied to regulator 8.
- FIG. 3 represents the opening timing diagrams of these injectors and l 'consecutive evolution of the fuel pressure P in the rail 7.
- the computer 9 easily detects a situation opening in overlap of at least two injectors, by comparing the duration between two top dead centers (P.M.H.) successive, known by the engine speed, at opening time of the corresponding injector. When this opening time is greater than the duration of the interval between 2 PMH, the computer 9 diagnostic overlapping opening times of at least two of injectors.
- P.M.H. top dead centers
- the computer 9 requires for the measurement of the pressure of fuel in an injector, a sample of this synchronous measurement at the opening of said injector, that this opening occurs alone or during the time another injector, and corrects it by decrement the selected sample to account the average fuel pressure drop that results of the opening of the injector considered.
- the computer 9 can suitably adjust the opening time T i of each injector by controlling the instant of its closing.
- the computer 7 can directly calculate this opening time in adding, to an opening time T i calculated on the basis of the pressure recorded, an increment ⁇ T i as a function of the calculated opening time and of the pressure recorded, this increment compensating for the drop in pressure observed in the injector at the following the opening of it.
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
- la figure 1 est un schéma d'un dispositif d'alimentation en carburant d'un moteur à combustion interne à injection directe, décrit en préambule de la présente description et propre à la mise en oeuvre du procédé suivant l'invention, et
- les figures 2 et 3 sont des graphes illustrant ce procédé.
Claims (6)
- Procédé de calcul de la pression de carburant régnant dans un injecteur électromagnétique (6i) de ce carburant dans un des cylindres d'un moteur à combustion interne à injection directe, les injecteurs (6i) associés auxdits cylindres étant alimentés en carburant par une rampe d'alimentation (7) commune et leur temps d'ouverture (Ti) calculé et commandé par un calculateur (9),
caractérisé en ce que :a) on détecte un recouvrement éventuel des temps d'ouverture d'au moins deux desdits injecteurs (6i),b) en l'absence d'un tel recouvrement, en relève la pression du carburant dans la rampe (7) en dehors du temps d'ouverture de l'injecteur considéré,c) en présence d'un tel recouvrement, on relève la pression du carburant à l'ouverture de l'injecteur considéré, etd) on corrige la mesure relevée en fonction d'une variation prédéterminée de la pression de carburant, induite par l'ouverture du ou des injecteurs (6i), pour obtenir la valeur de la pression de carburant régnant dans l'injecteur (6i). - Procédé conforme à la revendication 1, caractérisé en ce que, à l'étape d), on retranche de la mesure relevée un décrément fonction de la pression mesurée et/ou d'une estimation du temps d'ouverture (Ti).
- Procédé conforme à la revendication 1, appliqué au calcul du temps d'ouverture (Ti) des injecteurs du moteur, caractérisé en ce qu'on ajoute au temps d'ouverture calculé sur la base de la pression relevée, un incrément (ΔTi) fonction du temps d'ouverture calculé et de la pression de carburant relevée.
- Procédé conforme à la revendication 1, caractérisé en ce que, à l'étape b), on relève la pression de carburant par sélection d'un échantillon de mesure de cette pression, choisi parmi une suite de tels échantillons, en éliminant les échantillons prélevés pendant le temps d'ouverture des injecteurs.
- Procédé conforme à la revendication 4, caractérisé en ce que la période d'échantillonnage est de 4 à 10 ms environ.
- Procédé conforme à la revendication 1, caractérisé en ce que, à l'étape c), on impose un échantillonnage synchrone à la commande d'ouverture de l'injecteur.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9912573A FR2799544B1 (fr) | 1999-10-08 | 1999-10-08 | Procede de mesure de la pression de carburant regnant dans un injecteur electromagnetique de ce carburant dans un des cylindres d'un moteur a combustion interne a injection directe |
FR9912573 | 1999-10-08 | ||
PCT/FR2000/002778 WO2001027454A1 (fr) | 1999-10-08 | 2000-10-06 | Procede de mesure de la pression de carburant dans une rampe d'injection d'un moteur a combustion interne |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1218629A1 EP1218629A1 (fr) | 2002-07-03 |
EP1218629B1 true EP1218629B1 (fr) | 2004-12-08 |
Family
ID=9550716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00967963A Expired - Lifetime EP1218629B1 (fr) | 1999-10-08 | 2000-10-06 | Procede de mesure de la pression de carburant dans une rampe a injection d'un moteur a combustion interne |
Country Status (8)
Country | Link |
---|---|
US (1) | US6705295B1 (fr) |
EP (1) | EP1218629B1 (fr) |
JP (1) | JP4471550B2 (fr) |
KR (1) | KR100733800B1 (fr) |
DE (1) | DE60016612T2 (fr) |
ES (1) | ES2228615T3 (fr) |
FR (1) | FR2799544B1 (fr) |
WO (1) | WO2001027454A1 (fr) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6964261B2 (en) * | 2003-12-11 | 2005-11-15 | Perkins Engines Company Limited | Adaptive fuel injector trimming during a zero fuel condition |
US7370521B1 (en) * | 2006-10-25 | 2008-05-13 | Gm Global Technology Operations, Inc. | Method to detect a contaminated fuel injector |
US8307790B2 (en) * | 2010-04-08 | 2012-11-13 | Ford Global Technologies, Llc | Method for operating a vehicle with a fuel reformer |
US8402928B2 (en) * | 2010-04-08 | 2013-03-26 | Ford Global Technologies, Llc | Method for operating an engine with variable charge density |
US8015952B2 (en) | 2010-04-08 | 2011-09-13 | Ford Global Technologies, Llc | Engine fuel reformer monitoring |
US8539914B2 (en) * | 2010-04-08 | 2013-09-24 | Ford Global Technologies, Llc | Method for operating an engine with a fuel reformer |
US8037850B2 (en) * | 2010-04-08 | 2011-10-18 | Ford Global Technologies, Llc | Method for operating an engine |
US8146541B2 (en) * | 2010-04-08 | 2012-04-03 | Ford Global Technologies, Llc | Method for improving transient engine operation |
US8001934B2 (en) * | 2010-04-08 | 2011-08-23 | Ford Global Technologies, Llc | Pump control for reformate fuel storage tank |
US8041500B2 (en) | 2010-04-08 | 2011-10-18 | Ford Global Technologies, Llc | Reformate control via accelerometer |
US8191514B2 (en) | 2010-04-08 | 2012-06-05 | Ford Global Technologies, Llc | Ignition control for reformate engine |
US8613263B2 (en) * | 2010-04-08 | 2013-12-24 | Ford Global Technologies, Llc | Method for operating a charge diluted engine |
US8245671B2 (en) | 2010-04-08 | 2012-08-21 | Ford Global Technologies, Llc | Operating an engine with reformate |
US8230826B2 (en) * | 2010-04-08 | 2012-07-31 | Ford Global Technologies, Llc | Selectively storing reformate |
US8118006B2 (en) | 2010-04-08 | 2012-02-21 | Ford Global Technologies, Llc | Fuel injector diagnostic for dual fuel engine |
JP5519410B2 (ja) * | 2010-06-01 | 2014-06-11 | 本田技研工業株式会社 | 内燃機関の燃料供給装置 |
US10094320B2 (en) * | 2015-06-23 | 2018-10-09 | Ford Global Technologies, Llc | Methods and systems for dual fuel injection |
DE102015217645A1 (de) * | 2015-09-15 | 2017-03-16 | Robert Bosch Gmbh | Verfahren zum Betreiben einer Einspritzanlage |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2715440B1 (fr) * | 1994-01-24 | 1996-02-23 | Siemens Automotive Sa | Procédé de commande de la quantité de carburant injecté dans un moteur à combustion interne. |
DE19718171C2 (de) * | 1997-04-29 | 2001-11-15 | Siemens Ag | Verfahren zum Bestimmen der Einspritzzeit für eine direkteinspritzende Brennkraftmaschine |
DE19726756C2 (de) * | 1997-06-24 | 2002-03-07 | Bosch Gmbh Robert | System zum Betreiben einer Brennkraftmaschine insbesondere eines Kraftfahrzeugs |
DE19735561B4 (de) | 1997-08-16 | 2007-12-20 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine |
WO1999047802A1 (fr) * | 1998-03-16 | 1999-09-23 | Siemens Aktiengesellschaft | Procede pour determiner le temps d'injection dans un moteur a combustion interne a injection directe |
JP4627603B2 (ja) * | 2001-03-15 | 2011-02-09 | 日立オートモティブシステムズ株式会社 | 燃料供給装置 |
-
1999
- 1999-10-08 FR FR9912573A patent/FR2799544B1/fr not_active Expired - Fee Related
-
2000
- 2000-10-06 US US10/110,110 patent/US6705295B1/en not_active Expired - Fee Related
- 2000-10-06 JP JP2001529568A patent/JP4471550B2/ja not_active Expired - Fee Related
- 2000-10-06 DE DE60016612T patent/DE60016612T2/de not_active Expired - Lifetime
- 2000-10-06 EP EP00967963A patent/EP1218629B1/fr not_active Expired - Lifetime
- 2000-10-06 WO PCT/FR2000/002778 patent/WO2001027454A1/fr active IP Right Grant
- 2000-10-06 KR KR1020027004509A patent/KR100733800B1/ko not_active IP Right Cessation
- 2000-10-06 ES ES00967963T patent/ES2228615T3/es not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
KR100733800B1 (ko) | 2007-07-02 |
JP2003511620A (ja) | 2003-03-25 |
JP4471550B2 (ja) | 2010-06-02 |
WO2001027454A1 (fr) | 2001-04-19 |
FR2799544A1 (fr) | 2001-04-13 |
ES2228615T3 (es) | 2005-04-16 |
KR20020081204A (ko) | 2002-10-26 |
DE60016612D1 (de) | 2005-01-13 |
DE60016612T2 (de) | 2005-05-25 |
FR2799544B1 (fr) | 2002-01-04 |
US6705295B1 (en) | 2004-03-16 |
EP1218629A1 (fr) | 2002-07-03 |
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