WO1998055760A1 - Purging a direct injection engine injector ramp - Google Patents

Purging a direct injection engine injector ramp Download PDF

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Publication number
WO1998055760A1
WO1998055760A1 PCT/FR1998/001088 FR9801088W WO9855760A1 WO 1998055760 A1 WO1998055760 A1 WO 1998055760A1 FR 9801088 W FR9801088 W FR 9801088W WO 9855760 A1 WO9855760 A1 WO 9855760A1
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WO
WIPO (PCT)
Prior art keywords
high pressure
purge
purging
supply circuit
engine
Prior art date
Application number
PCT/FR1998/001088
Other languages
French (fr)
Inventor
Henri Mazet
Original Assignee
Magneti Marelli France
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Magneti Marelli France filed Critical Magneti Marelli France
Publication of WO1998055760A1 publication Critical patent/WO1998055760A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F02D41/065—Introducing corrections for particular operating conditions for engine starting or warming up for starting at hot start or restart
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/0245—Means for varying pressure in common rails by bleeding fuel pressure between the high pressure pump and the common rail
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/025—Means for varying pressure in common rails by bleeding fuel pressure from the common rail
    • 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
    • F02D2250/02—Fuel evaporation in fuel rails, e.g. in common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/60—Fuel-injection apparatus having means for facilitating the starting of engines, e.g. with valves or fuel passages for keeping residual pressure in common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/007—Venting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • F02M63/0215—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by draining or closing fuel conduits

Definitions

  • the present invention relates to a fuel supply circuit for an injector rail of an internal combustion engine with direct injection of a motor vehicle.
  • the injector rail as well as the injectors are subjected to a very high fuel pressure which is only partially canceled out when the engine is stopped. Consequently, a residual pressure urges the injectors as well as the ramp even when the engine is stopped. This pressure degrades the tightness of the injectors, causing leaks to the cylinders and to the atmosphere via exhaust systems. This is contrary to the future application of anti-evaporation standards (SHED standards) and degrades the hot start of the engine.
  • SHED standards anti-evaporation standards
  • a first solution known from DE-A-195 39 885 consists in producing a fuel supply circuit for an injector rail of an internal combustion engine comprising on the one hand, a low pressure pump placed in a fuel tank and which communicates, via a supply line, with a direct high-pressure injection pump and a high-pressure regulator regulating the high pressure delivered to the injector manifold and on the other hand, means of purge of the injector rail and the purge control means intended to control the purge means for purging the rail during the first start of the engine and during the hot start of this engine.
  • a solution requires placing the high pressure regulator downstream of the injector manifold in order to be able to purge said manifold. However, it is sometimes necessary to place this regulator upstream of the ramp.
  • the object of the present invention is to remedy the drawbacks mentioned above, by providing a fuel supply circuit which makes it possible to eliminate the air bubbles when the engine is started for the first time as well as the vapor bubbles linked to the voltage. of fuel vapor prevailing in the injector manifold during a warm restart of the engine.
  • Another object of the invention is to provide a fuel circuit which makes it possible to reduce, in particular when the vehicle engine is stopped, the residual pressure in the injector manifold to a sufficiently low value.
  • the subject of the present invention is a fuel supply circuit of the aforementioned type, characterized in that the high pressure regulator is placed upstream of the injector rail and the purge means comprise a purge solenoid valve disposed downstream of the injector manifold.
  • the supply circuit according to the present invention may optionally further include one or more of the following characteristics:
  • control means include the computer and control the opening of the purge solenoid valve during the purge phases;
  • the purge solenoid valve is controlled upon opening by the computer to relieve the injector rail;
  • the low pressure pump injects fuel into the supply line during the purge phases
  • the circuit includes a shunt device of the high pressure pump intended to shunt the high pressure pump during the purge phases;
  • the shunting device comprises a piloted solenoid valve
  • the high pressure pump and the high pressure regulator form a single component controlled by the computer.
  • the supply circuit 1 intended to be installed on board a motor vehicle and represented in the figure comprises a low pressure pump 2 connected by a supply duct 3, to a direct high pressure injection pump 4 intended to bring fuel in a manifold 5 of injectors 14 upstream of which a high pressure regulator 6 is arranged.
  • the low pressure pump 2 is arranged in a fuel tank 7 of the vehicle. In a manner known per se, it sucks the fuel from the tank 7 through a prefilter 8 and discharges the fuel into the fuel line. ment 3 through a filter 9 and a low pressure regulator 10. This low pressure regulator has a return 11 to send the excess fuel to be injected into the duct 3 towards the tank 7.
  • the high pressure regulator 6 has a return 15 to the tank 7 for returning the excess fuel brought by the high pressure pump 4 into the rail 5, towards the fuel tank 7.
  • the supply circuit 1 also includes a device 16 which makes it possible to bypass the high pressure pump 4 and which is controlled by the computer 12 when this device takes the form of a solenoid valve.
  • the device 16 may consist of a valve.
  • a purge solenoid valve 18 is placed downstream of the ramp 5, this solenoid valve 18 having a return pipe 19 for the fuel in the tank 7.
  • the computer 12 controls the operation of the shunt solenoid valve 16, the regulator 6, as well as the purge solenoid valve 18.
  • the low-pressure booster pump 2 is an electric pump which operates as soon as the motor vehicle is switched on, on which the supply circuit 1 is placed, while the high-pressure pump 4 is for example a mechanical pump, the operation of which is linked to that of the engine (not shown) of the motor vehicle, namely, the speed of rotation of this pump is linked to the speed of rotation of the engine.
  • solenoid valve 16 is made necessary insofar as technological difficulties are encountered in producing a high pressure pump 4 which allows the passage of fuel when this pump is stopped or operating at low speed.
  • the low pressure pump 2 When the vehicle engine is started for the first time in a manufacturing plant, after it has been assembled, or after a fuel shortage, switching on causes the low pressure pump 2 to operate, which then sends fuel to the supply line 3.
  • the computer 12 controls the opening of the bypass 16 and drain 18 solenoid valves so that the fuel injected by the low pressure pump 2 circulates in the supply line 3 and in the rail 5 avoiding the high pressure pump 4.
  • the entire quantity of fuel injected is returned to the reservoir 7 through the solenoid valve 18 in order to purge the manifold 5 and the conduit 3.
  • the solenoid valves 16 and 18 are closed by the computer 12, the quantity of fuel brought into the rail 5 by the high pressure pump 4 being regulated by the high pressure regulator 6 to be injected into the rail 5.
  • the computer 12 controls the opening of the solenoid valve 18 which serves as a means of load shedding of the ramp 5.
  • the solenoid valve 18 is commanded to close in order to keep a certain amount of fuel in the ramp in order to facilitate possible restarting of the engine by the user.
  • the solenoid valve 18 then serves as a load shedding means.
  • the computer 12 controls the opening of the shunt 16 and bleed solenoid valves 18 in order to purge the manifold 5 of injectors 14.
  • the high pressure regulator 6 is integrated into the high pressure pump 4 to constitute a single component. This component has the advantage of being economical to produce and allows the elimination of a connection (pipe) between the regulator 6 and the pump 4. The risks of leakage are thus almost zero.
  • a pump is controlled (by the computer 12), which eliminates the need to provide a fuel return connection from the high pressure regulator to the tank.
  • the shunt solenoid valve 16 is then placed in parallel with respect to this single component.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The invention concerns a circuit supplying fuel to an internal combustion engine injector (14) ramp (5) comprising a low pressure pump (2) located in a fuel tank (7) and communicating, through a supply conduit (3), with a high pressure direct injection pump (4) and a high pressure regulator (6) regulating the high pressure delivered to the injector ramp. The circuit further comprises means for purging (18) the injector ramp and purging control means (12) controlling the purging means to purge the ramp at the engine initial start and during hot starting.

Description

PURGE D'UNE RAMPE D'INJECTEURS D'UN MOTEUR A INJECTION DIRECTE BLEEDING A RAMP OF INJECTORS OF A DIRECT INJECTION ENGINE
La présente invention est relative à un circuit d'alimentation en carburant d'une rampe d'injecteurs d'un moteur à combustion interne à injection directe de véhicule automobile.The present invention relates to a fuel supply circuit for an injector rail of an internal combustion engine with direct injection of a motor vehicle.
Malgré les nombreuses précautions prises lors de la fabrication de ces moteurs, la présence de bulles d'air contenues dans les éléments constitutifs du circuit allonge excessivement la première mise en route du moteur tout en risquant de provoquer un fonctionnement à sec desdits éléments, notamment des injecteurs.Despite the numerous precautions taken during the manufacture of these motors, the presence of air bubbles contained in the components of the circuit excessively lengthens the first start-up of the motor while risking causing dry running of said elements, in particular injectors.
De plus, lors de l'utilisation habituelle du véhicule automobile, un utilisateur peut être amené à redémarrer le moteur du véhicule automobile à bord duquel il a pris place alors que ce moteur est encore chaud en raison de son utilisation précédente. Aussi, la probabilité de présence de bulles de vapeur est forte. Ces bulles gênent le fonctionnement des injecteurs et entraînent donc une mauvaise combustion.In addition, during the normal use of the motor vehicle, a user may have to restart the engine of the motor vehicle on board which he has taken place while this engine is still hot due to his previous use. Also, the probability of the presence of vapor bubbles is high. These bubbles interfere with the operation of the injectors and therefore cause poor combustion.
Or, une mauvaise combustion favorise une augmentation de la consommation en carburant du véhicule et des émissions de gaz dans l'atmosphère, et dégrade la mise en route du moteur en allongeant le temps de mise en route.However, poor combustion promotes an increase in the vehicle's fuel consumption and gas emissions in the atmosphere, and degrades the starting of the engine by lengthening the starting time.
Par ailleurs, lors du fonctionnement du moteur du véhicule, la rampe d'injecteurs ainsi que les injecteurs sont soumis à une pression de carburant très élevée qui ne s'annule qu'en partie lors de l'arrêt du moteur. Par conséquent, une pression résiduelle sollicite les injecteurs ainsi que la rampe même à l'arrêt du moteur. Cette pression dégrade l'étanchéité des injecteurs en provoquant des fuites vers les cylindres et vers 1 ' atmosphère par l'intermédiaire de systèmes d'échappement. Ceci est contraire à l'application future des normes anti- évaporation (normes SHED) et dégrade le démarrage à chaud du moteur.Furthermore, during the operation of the vehicle engine, the injector rail as well as the injectors are subjected to a very high fuel pressure which is only partially canceled out when the engine is stopped. Consequently, a residual pressure urges the injectors as well as the ramp even when the engine is stopped. This pressure degrades the tightness of the injectors, causing leaks to the cylinders and to the atmosphere via exhaust systems. This is contrary to the future application of anti-evaporation standards (SHED standards) and degrades the hot start of the engine.
Une première solution connue d'après le DE-A-195 39 885 consiste à réaliser un circuit d'alimentation en carburant d'une rampe d'injecteurs d'un moteur à combustion interne comprenant d'une part, une pompe basse pression placée dans un réservoir de carburant et qui communique, par un conduit d'alimentation, avec une pompe à injection directe à haute pression et un régulateur haute pression régulant la haute pression délivrée à la rampe d'injecteurs et d'autre part, des moyens de purge de la rampe d'injecteurs et des moyens de commande de purge destinés à commander les moyens de purge pour purger la rampe lors du premier démarrage du moteur et lors du démarrage à chaud de ce moteur . Toutefois, une telle solution nécessite de placer le régulateur haute pression en aval de la rampe d'injecteurs pour pouvoir purger ladite rampe. Or, il est parfois nécessaire de placer ce régulateur en amont de la rampe. La purge n'est alors plus possible. La présente invention a pour but de remédier aux inconvénients mentionnés ci-dessus, en fournissant un circuit d'alimentation en carburant qui permette d'éliminer les bulles d'air lors du premier démarrage du moteur ainsi que les bulles de vapeur liées à la tension de vapeur de carburant régnant dans la rampe d'injecteurs lors d'un redémarrage à chaud du moteur.A first solution known from DE-A-195 39 885 consists in producing a fuel supply circuit for an injector rail of an internal combustion engine comprising on the one hand, a low pressure pump placed in a fuel tank and which communicates, via a supply line, with a direct high-pressure injection pump and a high-pressure regulator regulating the high pressure delivered to the injector manifold and on the other hand, means of purge of the injector rail and the purge control means intended to control the purge means for purging the rail during the first start of the engine and during the hot start of this engine. However, such a solution requires placing the high pressure regulator downstream of the injector manifold in order to be able to purge said manifold. However, it is sometimes necessary to place this regulator upstream of the ramp. Purging is no longer possible. The object of the present invention is to remedy the drawbacks mentioned above, by providing a fuel supply circuit which makes it possible to eliminate the air bubbles when the engine is started for the first time as well as the vapor bubbles linked to the voltage. of fuel vapor prevailing in the injector manifold during a warm restart of the engine.
Un autre but de 1 ' invention est de fournir un circuit de carburant qui permette de ramener, notamment lors de l'arrêt du moteur du véhicule, la pression résiduelle dans la rampe d'injecteurs à une valeur suffisamment basse.Another object of the invention is to provide a fuel circuit which makes it possible to reduce, in particular when the vehicle engine is stopped, the residual pressure in the injector manifold to a sufficiently low value.
A cet effet, la présente invention a pour objet un circuit d'alimentation en carburant du type précité, caractérisé en ce que le régulateur haute pression est placé en amont de la rampe d'injecteurs et les moyens de purge comprennent une électrovanne de purge disposée en aval de la rampe d ' injecteurs . Le circuit d'alimentation selon la présente invention peut éventuellement comporter en outre une ou plusieurs des caractéristiques suivantes :To this end, the subject of the present invention is a fuel supply circuit of the aforementioned type, characterized in that the high pressure regulator is placed upstream of the injector rail and the purge means comprise a purge solenoid valve disposed downstream of the injector manifold. The supply circuit according to the present invention may optionally further include one or more of the following characteristics:
- le régulateur haute pression étant commandé par un calculateur, les moyens de commande comprennent le calculateur et commandent 1 ' ouverture de 1 ' électrovanne de purge lors des phases de purge ;the high pressure regulator being controlled by a computer, the control means include the computer and control the opening of the purge solenoid valve during the purge phases;
- lors de phases d'arrêt du moteur, 1 ' électrovanne de purge est commandée à 1 ' ouverture par le calculateur pour délester la rampe d'injecteurs ;- during engine stop phases, the purge solenoid valve is controlled upon opening by the computer to relieve the injector rail;
- la pompe basse pression injecte du carburant dans le conduit d ' alimentation pendant les phases de purge ;- the low pressure pump injects fuel into the supply line during the purge phases;
- le circuit comprend un dispositif de shuntage de la pompe haute pression destiné à shunter la pompe haute pression pendant les phases de purge ;- The circuit includes a shunt device of the high pressure pump intended to shunt the high pressure pump during the purge phases;
- le dispositif de shuntage comprend une électrovanne pilotée ; et- the shunting device comprises a piloted solenoid valve; and
- la pompe haute pression et le régulateur haute pression forment un composant unique piloté par le calcula- teur.- the high pressure pump and the high pressure regulator form a single component controlled by the computer.
Un exemple de réalisation de 1 ' invention va maintenant être décrit en regard de la figure unique qui représente, sous forme schématique, un mode de réalisation du circuit d'alimentation en carburant d'une rampe d'injecteurs selon la présente invention.An exemplary embodiment of the invention will now be described with reference to the single figure which shows, in schematic form, an embodiment of the fuel supply circuit of an injector rail according to the present invention.
Le circuit d'alimentation 1 destiné à être installé à bord d'un véhicule automobile et représenté à la figure comporte une pompe basse pression 2 reliée par un conduit d'alimentation 3, à une pompe à injection directe à haute pression 4 destinée à amener du carburant dans une rampe 5 d'injecteurs 14 en amont de laquelle est disposé un régulateur haute pression 6.The supply circuit 1 intended to be installed on board a motor vehicle and represented in the figure comprises a low pressure pump 2 connected by a supply duct 3, to a direct high pressure injection pump 4 intended to bring fuel in a manifold 5 of injectors 14 upstream of which a high pressure regulator 6 is arranged.
La pompe basse pression 2 est disposée dans un réservoir de carburant 7 du véhicule. De manière connue en soi, elle aspire le carburant du réservoir 7 au travers d'un préfiltre 8 et refoule le carburant dans le conduit d'au- mentation 3 au travers d'un filtre 9 et d'un régulateur basse pression 10. Ce régulateur basse pression possède un retour 11 pour envoyer le surplus de carburant à injecter dans le conduit 3 vers le réservoir 7. Un calculateur 12, placé à bord du véhicule, contrôle le fonctionnement du régulateur haute pression 6 en fonction d ' informations qui lui sont fournies par un capteur de pression 13 mesurant la pression de carburant dans la rampe 5 d'injecteurs 14. Le régulateur haute pression 6 possède un retour 15 vers le réservoir 7 pour renvoyer le surplus de carburant amené par la pompe haute pression 4 dans la rampe 5, vers le réservoir de carburant 7.The low pressure pump 2 is arranged in a fuel tank 7 of the vehicle. In a manner known per se, it sucks the fuel from the tank 7 through a prefilter 8 and discharges the fuel into the fuel line. ment 3 through a filter 9 and a low pressure regulator 10. This low pressure regulator has a return 11 to send the excess fuel to be injected into the duct 3 towards the tank 7. A computer 12, placed on board of the vehicle, controls the operation of the high pressure regulator 6 according to information supplied to it by a pressure sensor 13 measuring the fuel pressure in the injector manifold 5. The high pressure regulator 6 has a return 15 to the tank 7 for returning the excess fuel brought by the high pressure pump 4 into the rail 5, towards the fuel tank 7.
Le • circuit d ' alimentation 1 comprend également un dispositif 16 qui permet de shunter la pompe haute pression 4 et qui est commandé par le calculateur 12 lorsque ce dispositif prend la forme d'une électrovanne. En variante, le dispositif 16 peut être constitué d'une valve.The supply circuit 1 also includes a device 16 which makes it possible to bypass the high pressure pump 4 and which is controlled by the computer 12 when this device takes the form of a solenoid valve. Alternatively, the device 16 may consist of a valve.
Par ailleurs, une électrovanne de purge 18 est placée en aval de la rampe 5, cette électrovanne 18 possédant un conduit de retour 19 du carburant dans le réservoir 7.Furthermore, a purge solenoid valve 18 is placed downstream of the ramp 5, this solenoid valve 18 having a return pipe 19 for the fuel in the tank 7.
Le calculateur 12 commande le fonctionnement de 1 ' électrovanne de shuntage 16, du régulateur 6, ainsi que de 1 ' électrovanne de purge 18.The computer 12 controls the operation of the shunt solenoid valve 16, the regulator 6, as well as the purge solenoid valve 18.
La pompe de gavage basse pression 2 est une pompe électrique qui fonctionne dès la mise sous tension du véhicule automobile à bord duquel est placé le circuit d'alimentation 1, tandis que la pompe haute pression 4 est par exemple une pompe mécanique dont le fonctionnement est lié à celui du moteur (non représenté) du véhicule automobile à savoir, la vitesse de rotation de cette pompe est liée à la vitesse de rotation du moteur.The low-pressure booster pump 2 is an electric pump which operates as soon as the motor vehicle is switched on, on which the supply circuit 1 is placed, while the high-pressure pump 4 is for example a mechanical pump, the operation of which is linked to that of the engine (not shown) of the motor vehicle, namely, the speed of rotation of this pump is linked to the speed of rotation of the engine.
La présence de 1 ' électrovanne 16 est rendue nécessaire dans la mesure où l'on rencontre des difficultés technologiques à réaliser une pompe haute pression 4 qui permette le passage du carburant lorsque cette pompe est arrêtée ou fonctionne à bas régime.The presence of the solenoid valve 16 is made necessary insofar as technological difficulties are encountered in producing a high pressure pump 4 which allows the passage of fuel when this pump is stopped or operating at low speed.
Lors du premier démarrage, en usine de fabrication, du moteur du véhicule, après que celui-ci ait été assemblé, ou après une panne de carburant, la mise sous tension entraîne le fonctionnement de la pompe basse pression 2 qui envoie alors du carburant dans le conduit d'alimentation 3. Le calculateur 12 commande 1 ' ouverture des électrovannes de shuntage 16 et de purge 18 de sorte que le carburant injecté par la pompe basse pression 2 circule dans le conduit d'alimentation 3 et dans la rampe 5 en évitant la pompe haute pression 4. La totalité de la quantité de carburant injecté est retournée au réservoir 7 au travers de 1 ' électrovanne 18 afin de purger la rampe 5 et le conduit 3. Pendant le fonctionnement normal du moteur, les électrovannes 16 et 18 sont fermées par le calculateur 12, la quantité de carburant amené dans la rampe 5 par la pompe haute pression 4 étant régulée par le régulateur haute pression 6 pour être injectée dans la rampe 5. Au cours d'une phase d'arrêt du moteur, ou d'un dysfonctionnement de l'un des organes du circuit de carburant ou bien encore d'un accident du véhicule, le calculateur 12 commande l'ouverture de 1 ' électrovanne 18 qui sert de moyen de délestage de la rampe 5. Quelques instants après avoir été ouverte, 1 ' électrovanne 18 est commandée à la fermeture pour garder une certaine quantité de carburant dans la rampe afin de faciliter un éventuel redémarrage du moteur par l'utilisateur. L ' électrovanne 18 sert alors de moyen de délestage. Lorsque 1 ' utilisateur effectue un nouveau démarrage du moteur, après avoir utilisé le véhicule quelques instants auparavant, le moteur est encore chaud. La température du moteur combinée à des conditions atmosphériques extérieures particulières provoquent la formation de bulles de vapeur de carburant dans la rampe 5 d'injecteurs 14 néfastes à une bonne combustion du carburant. Aussi, lors d'un redémarrage à chaud du moteur, le calculateur 12 commande l'ouverture des électrovannes de shuntage 16 et de purge 18 afin de purger la rampe 5 d ' injecteurs 14. En variante, le régulateur haute pression 6 est intégré à la pompe haute pression 4 pour constituer un composant unique. Ce composant a pour avantage d'être économique à réaliser et permet la suppression d'une liaison (tuyau) entre le régulateur 6 et la pompe 4. Les risques de fuite sont ainsi quasiment nuls. En outre, on obtient une pompe pilotée (par le calculateur 12), ce qui élimine la nécessité de prévoir une liaison de retour du carburant du régulateur haute pression vers le réservoir. L ' électrovanne de shuntage 16 est alors placée en parallèle par rapport à ce composant unique. When the vehicle engine is started for the first time in a manufacturing plant, after it has been assembled, or after a fuel shortage, switching on causes the low pressure pump 2 to operate, which then sends fuel to the supply line 3. The computer 12 controls the opening of the bypass 16 and drain 18 solenoid valves so that the fuel injected by the low pressure pump 2 circulates in the supply line 3 and in the rail 5 avoiding the high pressure pump 4. The entire quantity of fuel injected is returned to the reservoir 7 through the solenoid valve 18 in order to purge the manifold 5 and the conduit 3. During the normal operation of the engine, the solenoid valves 16 and 18 are closed by the computer 12, the quantity of fuel brought into the rail 5 by the high pressure pump 4 being regulated by the high pressure regulator 6 to be injected into the rail 5. During a e engine shutdown phase, or a malfunction of one of the organs of the fuel circuit or even a vehicle accident, the computer 12 controls the opening of the solenoid valve 18 which serves as a means of load shedding of the ramp 5. A few moments after being opened, the solenoid valve 18 is commanded to close in order to keep a certain amount of fuel in the ramp in order to facilitate possible restarting of the engine by the user. The solenoid valve 18 then serves as a load shedding means. When the user starts the engine again, after having used the vehicle a few moments before, the engine is still warm. The engine temperature combined with particular external atmospheric conditions cause the formation of fuel vapor bubbles in the manifold 5 of injectors 14 harmful to good combustion of the fuel. Also, during a warm restart of the engine, the computer 12 controls the opening of the shunt 16 and bleed solenoid valves 18 in order to purge the manifold 5 of injectors 14. As a variant, the high pressure regulator 6 is integrated into the high pressure pump 4 to constitute a single component. This component has the advantage of being economical to produce and allows the elimination of a connection (pipe) between the regulator 6 and the pump 4. The risks of leakage are thus almost zero. In addition, a pump is controlled (by the computer 12), which eliminates the need to provide a fuel return connection from the high pressure regulator to the tank. The shunt solenoid valve 16 is then placed in parallel with respect to this single component.

Claims

REVENDICATIONS
1. Circuit d'alimentation en carburant d'une rampe (5) d'injecteurs (14) d'un moteur à combustion interne comprenant d'une part, une pompe basse pression (2) placée dans un réservoir de carburant (7) et qui communique, par un conduit d'alimentation (3), avec une pompe à injection directe à haute pression (4) et un régulateur haute pression ( 6 ) régulant la haute pression délivrée à la rampe ( 5 ) d'injecteurs (14) et d'autre part, des moyens de purge de la rampe (5) d'injecteurs (14) et des moyens de commande de purge ( 12 ) destinés à commander les moyens de purge pour purger la rampe ( 5 ) lors du premier démarrage du moteur et lors du démarrage à chaud de ce moteur, caractérisé en ce que le régulateur haute pression (6) est placé en amont de la rampe (5) d'injecteurs et les moyens de purge comprennent une électrovanne de purge (18) disposée en aval de la rampe (5) d'injecteurs (14).1. Fuel supply circuit for a ramp (5) of injectors (14) of an internal combustion engine comprising on the one hand, a low pressure pump (2) placed in a fuel tank (7) and which communicates, via a supply duct (3), with a direct high pressure injection pump (4) and a high pressure regulator (6) regulating the high pressure delivered to the injector manifold (5) (14 ) and on the other hand, means for purging the manifold (5) of injectors (14) and purge control means (12) intended to control the purging means for purging the manifold (5) during the first engine start and during hot start of this engine, characterized in that the high pressure regulator (6) is placed upstream of the injector rail (5) and the purge means comprise a purge solenoid valve (18) disposed downstream of the injector rail (5) (14).
2. Circuit d'alimentation selon la revendication 1, le régulateur haute pression ( 6 ) étant commandé par un calculateur ( 12 ) , caractérisé en ce que les moyens de commande comprennent le calculateur (12) et commandent l'ouverture de 1 ' électrovanne de purge (18) lors des phases de purge. 2. Supply circuit according to claim 1, the high pressure regulator (6) being controlled by a computer (12), characterized in that the control means comprise the computer (12) and control the opening of one solenoid valve purge (18) during the purge phases.
3. Circuit d'alimentation selon la revendication 2, caractérisé en ce que, lors de phases d'arrêt du moteur, 1 ' électrovanne de purge (18) est commandée à l'ouverture par le calculateur (12) pour délester la rampe (5) d'injecteurs (14). 3. Supply circuit according to claim 2, characterized in that, during engine stop phases, the purge solenoid valve (18) is controlled on opening by the computer (12) to relieve the ramp ( 5) injectors (14).
4. Circuit d'alimentation selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la pompe basse pression (2) injecte du carburant dans le conduit d'alimentation (3) pendant les phases de purge.4. Supply circuit according to any one of claims 1 to 3, characterized in that the low pressure pump (2) injects fuel into the supply duct (3) during the purging phases.
5. Circuit d'alimentation selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il comprend un dispositif de shuntage (16) de la pompe haute pression (4) destiné à shunter la pompe haute pression pendant les phases de purge.5. Supply circuit according to any one of claims 1 to 4, characterized in that it comprises a shunting device (16) of the high pressure pump (4) intended to bypass the high pressure pump during the purge phases.
6. Circuit d'alimentation selon la revendication 5, caractérisé en ce que le dispositif (16) comprend une électrovanne pilotée.6. Supply circuit according to claim 5, characterized in that the device (16) comprises a controlled solenoid valve.
7. Circuit d ' alimentation selon 1 ' une quelconque des revendications 2 à 6, caractérisé en ce que la pompe haute pression (4) et le régulateur haute pression (6) forment un composant unique piloté par le calculateur ( 12 ) . 7. Supply circuit according to any of claims 2 to 6, characterized in that the high pressure pump (4) and the high pressure regulator (6) form a single component controlled by the computer (12).
PCT/FR1998/001088 1997-06-02 1998-05-29 Purging a direct injection engine injector ramp WO1998055760A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR97/06744 1997-06-02
FR9706744A FR2764003B1 (en) 1997-06-02 1997-06-02 BLEEDING AN INJECTOR RAMP OF A DIRECT INJECTION ENGINE

Publications (1)

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WO1998055760A1 true WO1998055760A1 (en) 1998-12-10

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GB2387621A (en) * 2002-04-01 2003-10-22 Visteon Global Tech Inc Fuel delivery module for petrol direct injection with supply line pressure regulator and return line shut-off valve to provide different fuel line pressures

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DE10343482A1 (en) * 2003-09-19 2005-04-14 Robert Bosch Gmbh Fuel injection device for a combustion engine has high pressure pump store feedback line and filter between conveyer pump and measuring unit
JP4415987B2 (en) * 2006-12-20 2010-02-17 トヨタ自動車株式会社 Internal combustion engine fuel supply device
US9089799B2 (en) 2011-08-08 2015-07-28 Ti Group Automotive Systems, L.L.C. Fluid distribution system with filtration
EP2708710A3 (en) * 2012-09-13 2015-02-18 TI Group Automotive Systems, L.L.C. Fluid distribution system and components thereof

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US5558068A (en) * 1994-05-31 1996-09-24 Zexel Corporation Solenoid valve unit for fuel injection apparatus
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EP0643219A1 (en) * 1993-09-10 1995-03-15 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Fuel feeding system for internal combustion engine
US5558068A (en) * 1994-05-31 1996-09-24 Zexel Corporation Solenoid valve unit for fuel injection apparatus
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DE19858095A1 (en) * 1998-12-16 2000-07-06 Siemens Ag System for improving the starting of a diesel engine, has high pressure accumulator for compressing the fuel
DE19858095C2 (en) * 1998-12-16 2000-10-19 Siemens Ag Device for improving the starting behavior of internal combustion engines with memory injection systems
GB2387621A (en) * 2002-04-01 2003-10-22 Visteon Global Tech Inc Fuel delivery module for petrol direct injection with supply line pressure regulator and return line shut-off valve to provide different fuel line pressures
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GB2387621B (en) * 2002-04-01 2004-09-01 Visteon Global Tech Inc Fuel delivery module for petrol direct injection applications including supply line pressure regulator and return line shut-off valve

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FR2764003A1 (en) 1998-12-04
FR2764003B1 (en) 1999-08-06

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