EP1013914B1 - Fuel injection system for an internal combustion engine - Google Patents
Fuel injection system for an internal combustion engine Download PDFInfo
- Publication number
- EP1013914B1 EP1013914B1 EP19990403253 EP99403253A EP1013914B1 EP 1013914 B1 EP1013914 B1 EP 1013914B1 EP 19990403253 EP19990403253 EP 19990403253 EP 99403253 A EP99403253 A EP 99403253A EP 1013914 B1 EP1013914 B1 EP 1013914B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- engine
- pressure
- injectors
- fuel
- supply circuit
- 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
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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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
-
- 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
- F02D2250/31—Control of the fuel pressure
Definitions
- the present invention relates to a circuit fuel supply for a combustion engine internal.
- the invention applies to direct injection engines.
- Power circuits usually encountered in internal combustion engines of motor vehicles include a high pump pressure, an injector manifold which is supplied with fuel through the high pressure pump and means for controlling the operation of the injectors, the control means now closed the injectors during a fraction of the engine start-up phase and allowing the opening of the injectors when the pressure in the injector manifold has reached a threshold value predetermined, the control means comprising means which reconstitute the value of the pressure at from an operating model incorporating engine operating parameters.
- the pressure in fuel inside the fuel system can be low due to prolonged shutdown or because it has been intentionally made weak to avoid leakage to injectors when stopped.
- the injectors send fuel into engine cylinders under the forms a regular spray pattern.
- the injection is all the better as the fuel admitted to the injectors is high pressure.
- the object of the present invention is to remedy the aforementioned disadvantages in providing a circuit power supply which allows to establish, from the start, a optimal fuel pressure in the injectors when operation of these.
- a circuit of the aforementioned type is essentially characterized in that the threshold value is determined and modulated by the control means as a function of parameters engine operation such as temperature.
- the invention further relates to a motor for motor vehicle comprising a supply circuit fuel as defined above and a starter whose features allow the engine to be driven at a sufficient speed to reach the value of fuel threshold pressure in a time interval reduced.
- the time interval is significantly less than or equal to one second
- the power circuit 1 shown in Figure 1 is intended to supply fuel to a combustion engine internal of a motor vehicle.
- This power circuit includes a high pressure injection pump 2 and a ramp 4 downstream of which are injectors 5.
- the pump 2 is supplied with fuel from a tank (not shown) by an inlet duct 3 in the direction of arrow F.
- Ramp 4 is supplied with high fuel pressure by an outlet pipe 6 connecting the pump 2 to the rail 4.
- the injectors 5 spray the fuel at the inside of engine cylinders (not shown) under the jet shape 8.
- injectors 5 are controlled by control means 7. These control means also control the high pressure pump operation 2.
- the high pressure injection pump 2 is by example a pump whose speed of rotation is linked to that of the engine with which it is associated.
- a starter known per se (not shown) drives the engine: the rotation speed of the pump is proportional to the rotation speed of the engine.
- the fuel pressure delivered by the pump is then insufficient for proper functioning of the injectors 5.
- FIG. 2 shows that, during the engine starting phase, an operator actuates the starter at an instant t 1 , which causes the engine to a speed R d .
- the control means 7 keep the injectors 5 closed so that the injection of fuel into these injectors is prohibited.
- the fuel pressure delivered by this pump then increases continuously from time t 1 to time t 2 . This increase is relatively slow due to the phenomena of elasticity of the circuit and compressibility of the fuel.
- the pressure reaches a threshold value P s . This threshold value is considered sufficient to obtain good spraying of the fuel by the injectors 5.
- the control means 7 then authorize the opening of the injectors 5 at this instant t 2 .
- the injectors 5 are kept closed for a fraction of the start-up phase corresponding to the start of this phase.
- the good quality of the spray jet obtained by the present invention allows proper engine operation from the start, which reduces pollutant emissions.
- the fuel pressure delivered by the injection pump 2 continues to increase regularly. Simultaneously, the engine speed increases and the action on the starter is stopped in an instant t 3 . The number of engine revolutions increases until reaching a nominal speed necessary for the proper functioning of the vehicle on which it is installed.
- control means 7 comprise means for measuring, such as a sensor, the fuel pressure delivered into the rail 4 as well as means for comparison allowing the measured value to be compared with the threshold value stored in the control means 7.
- the measurement means reconstitute the pressure value from an operating model stored in the control means, this model incorporating engine operating parameters.
- the measuring means can be associated with the sensor.
- the threshold value at time t 2 is determined and modulated by the control means 7 as a function of other engine parameters such as, for example, the engine temperature.
- the engine has a positive ignition, it may also be advantageous not to order ignition as long as the injectors 5 are kept closed by the control means 7.
- the threshold pressure is generally reached in three or four engine revolutions.
- the starter used has mechanical characteristics making it possible to obtain the instant t 2 after a very short duration, typically of the order of one second. .
- threshold pressure can still be determined either directly at the exit of high pressure pump, either at the injectors.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Fuel-Injection Apparatus (AREA)
Description
La présente invention est relative à un circuit d'alimentation en carburant d'un moteur à combustion interne.The present invention relates to a circuit fuel supply for a combustion engine internal.
Plus particulièrement, l'invention s'applique aux moteurs à injection directe.More particularly, the invention applies to direct injection engines.
Les circuits d'alimentation habituellement rencontrés dans les moteurs à combustion interne de véhicules automobiles comprennent une pompe à haute pression, une rampe d'injecteurs qui est alimentée en carburant par l'intermédiaire de la pompe à haute pression et des moyens de commande du fonctionnement des injecteurs, les moyens de commande maintenant fermés les injecteurs pendant une fraction de la phase de démarrage du moteur et autorisant l'ouverture des injecteurs lorsque la pression dans la rampe d'injecteurs a atteint une valeur de seuil prédéterminée, les moyens de commande comprenant des moyens de mesure qui reconstituent la valeur de la pression à partir d'un modèle de fonctionnement incorporant des paramètres de fonctionnement du moteur.Power circuits usually encountered in internal combustion engines of motor vehicles include a high pump pressure, an injector manifold which is supplied with fuel through the high pressure pump and means for controlling the operation of the injectors, the control means now closed the injectors during a fraction of the engine start-up phase and allowing the opening of the injectors when the pressure in the injector manifold has reached a threshold value predetermined, the control means comprising means which reconstitute the value of the pressure at from an operating model incorporating engine operating parameters.
Lorsque le moteur ne fonctionne pas, la pression en carburant à l'intérieur du circuit d'alimentation peut être faible du fait d'un arrêt prolongé ou parce qu'elle a été rendue intentionnellement faible pour éviter des fuites aux injecteurs lorsqu'ils sont à l'arrêt.When the engine is not running, the pressure in fuel inside the fuel system can be low due to prolonged shutdown or because it has been intentionally made weak to avoid leakage to injectors when stopped.
Pour obtenir un fonctionnement optimal des moteurs à combustion interne, il est nécessaire que les injecteurs envoient le carburant dans des cylindres du moteur sous la forme d'un jet de pulvérisation régulier. L'injection est d'autant meilleure que le carburant admis dans les injecteurs est à haute pression.To obtain optimal operation of motors with internal combustion it is necessary that the injectors send fuel into engine cylinders under the forms a regular spray pattern. The injection is all the better as the fuel admitted to the injectors is high pressure.
Or, lors de la phase de démarrage du moteur, l'établissement de la haute pression par la pompe à haute pression est gêné d'une part, par la compressibilité du carburant et d'autre part, par la dilatation du circuit d'alimentation.However, during the engine start-up phase, the establishment of high pressure by the high pump pressure is hampered on the one hand, by the compressibility of the fuel and on the other hand, by the expansion of the circuit Power.
La présente invention a pour but de remédier aux inconvénients précités en fournissant un circuit d'alimentation qui permette d'établir, dès le démarrage, une pression optimale du carburant dans les injecteurs lors du fonctionnement de ceux-ci.The object of the present invention is to remedy the aforementioned disadvantages in providing a circuit power supply which allows to establish, from the start, a optimal fuel pressure in the injectors when operation of these.
A cet effet, selon l'invention, un circuit d'alimentation du type précité, est essentiellement caractérisé en ce que la valeur de seuil est déterminée et modulée par les moyens de commande en fonction de paramètres de fonctionnement du moteur tels que la température.To this end, according to the invention, a circuit of the aforementioned type, is essentially characterized in that the threshold value is determined and modulated by the control means as a function of parameters engine operation such as temperature.
Ainsi, il est possible d'obtenir une bonne pulvérisation du carburant tout en utilisant une pompe à haute pression de dimensions raisonnables, qui est optimisée pour le fonctionnement nominal du moteur, permettant une faible consommation de puissance pour son entraínement et un faible échauffement du carburant ainsi qu'une bonne précision de contrôle du dosage de petites quantités de carburant nécessaires au moteur dans des conditions de faible charge.So it is possible to get good spraying fuel while using a pump high pressure of reasonable dimensions, which is optimized for nominal engine operation, allowing low power consumption for training and low fuel heating and good precision control of dosing of small amounts of fuel required by the engine in conditions of low load.
Le circuit d'alimentation suivant l'invention peut éventuellement comporter en outre une ou plusieurs des caractéristiques suivantes :
- les moyens de commande comprennent des moyens de mesure de la pression de carburant dans la rampe et des moyens de comparaison de la valeur mesurée à la valeur de seuil ;
- lors du démarrage du moteur, le nombre de tours de la pompe à haute pression est proportionnel au nombre de tours du moteur ;
- la pompe à haute pression est une pompe à injection directe ; et
- la pompe à injection directe à haute pression possède des caractéristiques correspondant au régime de fonctionnement nominal du moteur.
- the control means include means for measuring the fuel pressure in the rail and means for comparing the measured value with the threshold value;
- when starting the engine, the number of revolutions of the high pressure pump is proportional to the number of revolutions of the engine;
- the high pressure pump is a direct injection pump; and
- the high pressure direct injection pump has characteristics corresponding to the nominal engine operating speed.
L'invention a en outre pour objet un moteur de véhicule automobile comprenant un circuit d'alimentation en carburant tel que défini ci-dessus et un démarreur dont les caractéristiques permettent d'entraíner le moteur à une vitesse suffisante pour permettre d'atteindre la valeur de pression de seuil de carburant dans un intervalle de temps réduit.The invention further relates to a motor for motor vehicle comprising a supply circuit fuel as defined above and a starter whose features allow the engine to be driven at a sufficient speed to reach the value of fuel threshold pressure in a time interval reduced.
De manière préférée, l'intervalle de temps est sensiblement inférieur ou égal à une secondePreferably, the time interval is significantly less than or equal to one second
Un exemple de l'invention va maintenant être décrit en regard des dessins annexés, sur lesquels :
- la figure 1 est une vue schématique du circuit d'alimentation selon la présente invention ; et
- la figure 2 représente des diagrammes illustrant le fonctionnement du circuit d'alimentation de la figure 1.
- Figure 1 is a schematic view of the supply circuit according to the present invention; and
- FIG. 2 represents diagrams illustrating the operation of the supply circuit of FIG. 1.
Le circuit d'alimentation 1 représenté à la figure 1
est destiné à alimenter en carburant un moteur à combustion
interne d'un véhicule automobile. Ce circuit d'alimentation
comprend une pompe à injection à haute pression 2 et une
rampe 4 en aval de laquelle sont situés des injecteurs 5. La
pompe 2 est alimentée en carburant à partir d'un réservoir
(non représenté) par un conduit d'arrivée 3 selon le sens de
la flèche F. La rampe 4 est alimentée en carburant à haute
pression par un conduit de sortie 6 reliant la pompe 2 à la
rampe 4. Les injecteurs 5 pulvérisent le carburant à
l'intérieur de cylindres du moteur (non représentés) sous la
forme de jets 8.The power circuit 1 shown in Figure 1
is intended to supply fuel to a combustion engine
internal of a motor vehicle. This power circuit
includes a high
Lors des différentes étapes du cycle de
fonctionnement du moteur à combustion interne, les
injecteurs 5 sont contrôlés par des moyens de commande 7.
Ces moyens de commande contrôlent également le
fonctionnement de la pompe à haute pression 2.During the different stages of the
operation of the internal combustion engine,
La pompe à injection à haute pression 2 est par
exemple une pompe dont la vitesse de rotation est liée à
celle du moteur auquel elle est associée. Lors de la phase
de démarrage du moteur, un démarreur connu en soi(non
représenté) entraíne le moteur : la vitesse de rotation de
la pompe est proportionnelle la vitesse de rotation du
moteur. La pression de carburant délivrée par la pompe est
alors insuffisante pour un bon fonctionnement des injecteurs
5.The high
Lorsque le moteur ne tourne pas, les injecteurs 5
sont fermés.When the engine is not running, the
La figure 2 montre que, lors de la phase de
démarrage du moteur, un opérateur actionne le démarreur en
un instant t1, ce qui entraíne le moteur à un régime Rd.
Selon la présente invention, pendant cette phase, les moyens
de commande 7 maintiennent la fermeture des injecteurs 5 de
sorte que l'injection de carburant dans ces injecteurs est
interdite. La pression de carburant délivrée par cette pompe
augmente alors de façon continue à partir de l'instant t1
jusqu'en un instant t2. Cette augmentation est relativement
lente du fait des phénomènes d'élasticité du circuit et de
compressibilité du carburant. En l'instant t2, la pression
atteint une valeur de seuil Ps. Cette valeur de seuil est
jugée suffisante pour obtenir une bonne pulvérisation du
carburant par les injecteurs 5. Les moyens de commande 7
autorisent alors l'ouverture des injecteurs 5 en cet instant
t2. En pratique, les injecteurs 5 sont maintenus fermés
pendant une fraction de la phase de démarrage correspondant
au début de cette phase.Figure 2 shows that, during the engine starting phase, an operator actuates the starter at an instant t 1 , which causes the engine to a speed R d . According to the present invention, during this phase, the control means 7 keep the
La bonne qualité du jet de pulvérisation obtenu par la présente invention permet un bon fonctionnement du moteur dès le démarrage, ce qui réduit les émissions de polluants.The good quality of the spray jet obtained by the present invention allows proper engine operation from the start, which reduces pollutant emissions.
Après l'instant t2, la pression de carburant
délivrée par la pompe à injection 2 continue à augmenter
régulièrement. Simultanément, le régime moteur augmente et
l'action sur le démarreur est arrêtée en un instant t3. Le
nombre de tours moteur augmente jusqu'à atteindre un régime
nominal nécessaire au bon fonctionnement du véhicule à bord
duquel il est installé.After the instant t 2 , the fuel pressure delivered by the
Pour déterminer l'instant où la pression en carburant atteint la pression de seuil Ps, les moyens de commande 7 comprennent des moyens de mesure, tel qu'un capteur, de la pression de carburant délivrée dans la rampe 4 ainsi que des moyens de comparaison permettant de comparer la valeur mesurée à la valeur de seuil en mémoire dans les moyens de commande 7.To determine the instant when the fuel pressure reaches the threshold pressure P s , the control means 7 comprise means for measuring, such as a sensor, the fuel pressure delivered into the rail 4 as well as means for comparison allowing the measured value to be compared with the threshold value stored in the control means 7.
En variante, les moyens de mesure reconstituent la valeur de la pression à partir d'un modèle de fonctionnement en mémoire dans les moyens de commande, ce modèle incorporant des paramètres de fonctionnement du moteur. Les moyens de mesure peuvent être associés au capteur.As a variant, the measurement means reconstitute the pressure value from an operating model stored in the control means, this model incorporating engine operating parameters. The measuring means can be associated with the sensor.
Dans encore une autre variante, la valeur de seuil en l'instant t2 est déterminée et modulée par les moyens de commande 7 en fonction d'autres paramètres moteur tels que par exemple, la température du moteur.In yet another variant, the threshold value at time t 2 is determined and modulated by the control means 7 as a function of other engine parameters such as, for example, the engine temperature.
Dans le cas où le moteur est à allumage commandé, il
pourra être également avantageux de ne pas commander
l'allumage tant que les injecteurs 5 sont maintenus fermés
par les moyens de commande 7.If the engine has a positive ignition, it
may also be advantageous not to order
ignition as long as the
La pression de seuil est généralement atteinte en trois ou quatre tours moteur. Afin de conserver le confort d'utilisation du véhicule lors du démarrage du moteur, le démarreur utilisé possède des caractéristiques mécaniques permettant d'obtenir l'instant t2 au bout d'une durée très courte, typiquement de l'ordre d'une seconde.The threshold pressure is generally reached in three or four engine revolutions. In order to maintain the comfort of using the vehicle when starting the engine, the starter used has mechanical characteristics making it possible to obtain the instant t 2 after a very short duration, typically of the order of one second. .
On comprend par ailleurs que la pression de seuil peut encore être déterminée soit directement à la sortie de pompe à haute pression, soit au niveau des injecteurs.We also understand that the threshold pressure can still be determined either directly at the exit of high pressure pump, either at the injectors.
Claims (7)
- Fuel supply circuit for an internal combustion engine comprising a high-pressure pump (2), a rail (4) for injectors (5) which is supplied with fuel by said high-pressure pump (2) and means (7) for controlling the operation of the injectors (5), the control means (7) keeping the injectors (5) closed during a fraction of the starting phase of the engine and allowing the opening of the injectors (5) when the pressure in the rail (4) for the injectors (5) has reached a predetermined threshold value (Ps), the control means (7) comprising measuring means which reconstitute the pressure value from an operating model incorporating operating parameters of the engine, characterised in that the threshold value is determined and modulated by the control means (7) as a function of operating parameters of the engine such as the temperature.
- Fuel supply circuit according to claim 1, characterised in that the control means (7) comprise means for measuring the pressure of the fuel in the rail (4) and means for comparing the measured value with the threshold value (Ps).
- Fuel supply circuit according to claim 1 or 2, characterised in that during the starting of the engine the rotational speed of the high-pressure pump (2) is proportional to the speed of the engine.
- Fuel supply circuit according to claim 3, characterised in that the high-pressure pump (2) is a direct injection pump.
- Fuel supply circuit according to claim 4, characterised in that the high-pressure direct injection pump (2) has characteristics corresponding to the nominal operating speed of the engine.
- Motor vehicle engine comprising a fuel supply circuit according to any one of claims 1 to 5 and a starter motor the characteristics of which allow the engine to be driven at a sufficient speed to be able to reach the threshold fuel pressure within a short interval of time.
- Motor vehicle engine according to claim 6, characterised in that the interval of time is substantially less than or equal to a second.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9816446 | 1998-12-24 | ||
| FR9816446A FR2787832B1 (en) | 1998-12-24 | 1998-12-24 | FUEL SUPPLY CIRCUIT OF AN INTERNAL COMBUSTION ENGINE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1013914A1 EP1013914A1 (en) | 2000-06-28 |
| EP1013914B1 true EP1013914B1 (en) | 2003-07-09 |
Family
ID=9534510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19990403253 Expired - Lifetime EP1013914B1 (en) | 1998-12-24 | 1999-12-22 | Fuel injection system for an internal combustion engine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1013914B1 (en) |
| DE (1) | DE69909418T2 (en) |
| ES (1) | ES2203035T3 (en) |
| FR (1) | FR2787832B1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3780933B2 (en) * | 2001-12-18 | 2006-05-31 | トヨタ自動車株式会社 | High pressure fuel supply device for internal combustion engine |
| US8195376B2 (en) * | 2007-03-05 | 2012-06-05 | Yanmar Co., Ltd. | Fuel injection control device for diesel engine |
| FR2991389A1 (en) * | 2012-06-05 | 2013-12-06 | Peugeot Citroen Automobiles Sa | Method for controlling internal combustion engine of car, involves opening injectors fitting to cylinders, and forecasting number of pump strokes needed to reach threshold pressure from bearing pressure |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5891367A (en) * | 1981-11-25 | 1983-05-31 | Nissan Motor Co Ltd | Fuel injection device for internal-combustion engine |
| AT380540B (en) * | 1982-02-12 | 1986-06-10 | Steyr Daimler Puch Ag | FUEL INJECTION SYSTEM FOR AN ELECTRICAL ENGINE, INCLUDING A STARTER LOCK, WITH DIESEL ENGINES |
| JPS61207833A (en) * | 1985-03-12 | 1986-09-16 | Yanmar Diesel Engine Co Ltd | Start control apparatus for internal-combustion engine |
| JP3418996B2 (en) * | 1992-04-24 | 2003-06-23 | 株式会社デンソー | Common rail fuel injector |
| JP3361422B2 (en) * | 1995-12-15 | 2003-01-07 | 日本特殊陶業株式会社 | Engine start control method and apparatus |
| JP3814858B2 (en) * | 1996-02-19 | 2006-08-30 | 日産自動車株式会社 | In-cylinder direct injection internal combustion engine control device |
-
1998
- 1998-12-24 FR FR9816446A patent/FR2787832B1/en not_active Expired - Lifetime
-
1999
- 1999-12-22 ES ES99403253T patent/ES2203035T3/en not_active Expired - Lifetime
- 1999-12-22 EP EP19990403253 patent/EP1013914B1/en not_active Expired - Lifetime
- 1999-12-22 DE DE1999609418 patent/DE69909418T2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE69909418T2 (en) | 2004-04-22 |
| ES2203035T3 (en) | 2004-04-01 |
| EP1013914A1 (en) | 2000-06-28 |
| DE69909418D1 (en) | 2003-08-14 |
| FR2787832B1 (en) | 2001-02-23 |
| FR2787832A1 (en) | 2000-06-30 |
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