EP3502459A1 - Fuel injector - Google Patents

Fuel injector Download PDF

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Publication number
EP3502459A1
EP3502459A1 EP18208348.5A EP18208348A EP3502459A1 EP 3502459 A1 EP3502459 A1 EP 3502459A1 EP 18208348 A EP18208348 A EP 18208348A EP 3502459 A1 EP3502459 A1 EP 3502459A1
Authority
EP
European Patent Office
Prior art keywords
conduit
washer
injector
high pressure
fuel injector
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.)
Withdrawn
Application number
EP18208348.5A
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German (de)
French (fr)
Inventor
Romain Vit
Jean-François Berlemont
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delphi Technologies IP Ltd
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Delphi Technologies IP Ltd
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Filing date
Publication date
Application filed by Delphi Technologies IP Ltd filed Critical Delphi Technologies IP Ltd
Publication of EP3502459A1 publication Critical patent/EP3502459A1/en
Withdrawn legal-status Critical Current

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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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/005—Fuel-injectors combined or associated with other devices the devices being sensors
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F02M2200/245—Position sensors, e.g. Hall sensors
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Definitions

  • the present invention generally relates to the field of fuel injectors and more specifically to an injector equipped with a means for detecting the position of the needle.
  • a fuel injector conventionally comprises a needle controlled opening and closing depending on the pressure in a control chamber, which pressure is a function of the position of a control solenoid valve.
  • Devices are known in which a sensor is arranged on the injector or an injector in which certain surfaces of the body components are provided with resistive coatings so that a measurement of electrical resistance can be made between two elements of the injector. .
  • a closed-loop strategy is implemented in which a control unit receives a signal relating to the position of the needle of the fuel injector. fuel.
  • Several electrical switch devices have been designed using the tip of the needle and the complementary bearing face to make electrical contact.
  • the electrical switch device called “ICL” the acronym of "injector closed loop” which means closed injector loop.
  • the electrical switch device “ICL” is based on the fact that the switching circuit is in series with pulling resistors powered by a DC voltage.
  • the resistance of the injector is related to the position of the needle of the injector and generally changes depending on the position of the needle and the physical contact between the needle and a body of the nozzle or with a set of injector control valve.
  • an injector 1 comprises a control valve assembly 2 and a hydraulic assembly 3.
  • the control valve assembly 2 comprises a valve body 4 and an electrical insulating washer 5.
  • the hydraulic assembly 3 comprises a nozzle body 6
  • the injector 1 comprises a high pressure circuit 7 having a first conduit 8 arranged inside the valve body 4 and a second conduit 9 arranged inside the nozzle body 6 of the hydraulic assembly 3.
  • the first conduit 8 of the high pressure circuit further comprises a restriction 10 arranged near an orifice 11 communicating with the restriction 10.
  • the restriction 10 is commonly called NPO which is the acronym for "Nozzle Path Orifice" which means orifice passage towards the nozzle body.
  • the restriction 10 improves the closure of the injector 1.
  • the restriction 10 has a diameter of about 0.55 mm.
  • the electrical insulating washer 5 is between the valve body 4 and the nozzle body 6.
  • the electrical insulating washer 5 is coated with an electrical insulating layer 12.
  • the electrical insulating washer 5 is provided with several holes including the through hole fuel under high pressure.
  • the passage hole of the electric insulating washer 5 for the high pressure fuel has a diameter greater than the diameter of the restriction 10.
  • the restriction 10 is pierced with a spark erosion process. Due to the configuration of the process, we must remove a portion of an electrical insulating layer previously applied to a lower face of the valve body 4 before drilling. This stripping operation creates an area having a detrimental electrical leak after the assembly of the injector 1 or during the operation of the injector 1. This zone without electrical insulating layer has a larger area than the diameter of the restriction 10
  • the assemblies thus produced have a lack of electrical insulation due to the misalignment between the electrical insulating washer 5 and the orifice 11 of the first conduit.
  • the electrical insulating washer 5 has a lack of electrical insulation at each edge around the holes and in particular around the through hole of the high pressure fuel. The lack of electrical insulation of the electrical insulating washer 5 and the inner face of the valve body 4 around the restriction 10 causes electrical conductivity which is detrimental to the measurement of the electrical resistance of the injector 1.
  • the object of the present invention is to provide a solution that overcomes these disadvantages.
  • a pressurized fuel injector for an internal combustion engine comprises a control valve assembly comprising a valve body having a first conduit, a nozzle body including a second conduit and injection holes, a clamping nut holding together the valve body and the nozzle body, the first conduit and the second conduit fitting together to define a high pressure circuit (114).
  • the fuel injector further comprises a washer clamped between the valve body and the nozzle body, the washer being provided with a hole defining a hydraulic restriction in the high pressure circuit.
  • the hydraulic restriction is arranged in the passage of high pressure fuel between the first conduit and the second conduit.
  • the washer is an electrical insulating washer.
  • the hole is off center on the puck.
  • the figure 1 illustrates an injector 100 extending along a longitudinal axis X.
  • the injector 100 comprises an actuator 102 controlled by a computer (not shown) arranged in the upper part of the injector 100, a control valve assembly 104 and a hydraulic part arranged in the lower part of the injector 100.
  • the control valve assembly 104 comprises a control valve body 106, a control valve and a low pressure chamber.
  • the hydraulic part of the injector 100 comprises a nozzle body 108, a needle 110 and a high pressure chamber 112 in which there is an upper end of the needle 110.
  • the injector further comprises a nut 109. The nut The injector 100 holds together the valve body 106 and the nozzle body 108.
  • the injector 100 is provided with a high pressure circuit 114 which allows the fuel to flow from an inlet to injection holes. 115 arranged in a lower portion of the nozzle body 108 and a low pressure return circuit which allows the uninjected fuel, also identified as a return leak, to flow back to an outlet.
  • the control valve comprises a control armature 116 and a control rod 118 fixed to each other.
  • the control valve body 106 is provided with a first conduit 120.
  • the nozzle body 108 is provided with a second conduit 122.
  • the first conduit 120 and the second conduit 122 adjust together to define the high circuit. pressure 114.
  • the first conduit 120 of the high pressure circuit 114 opens on both sides of the body of 106 control valve.
  • the first conduit 120 comprises an orifice 133 arranged on the side of a lower face of the control valve body 106.
  • the fuel injector 100 further comprises a washer 134 clamped between the valve body 106 and the nozzle body 108.
  • the washer 134 is provided with a hole 136 defining a hydraulic restriction 136 in the high pressure circuit 114.
  • the hole 136 of the washer is eccentric and aligned with the orifice 133 of the first conduit 120.
  • the washer 134 is electrically insulating.
  • the washer 134 is in contact with a lower face of the valve body 106.
  • the diameter of the orifice 133 is larger than the diameter of the hole 136 of the electrical insulating washer 134.
  • the hole 136 generates a pressure drop so that the pressure in the high pressure chamber 112 is greater than the pressure in the low pressure chamber.
  • the washer 134 is electrically insulating.
  • the electric insulating washer 134 comprises an electrical insulating layer having a thickness of at least 0.001 mm.
  • the electrical insulating layer may be an aluminum oxide.
  • the injector 100 comprises the needle 110 sliding in a bore as shown in FIG. figure 1 .
  • the movement of the needle 110 is controlled by two chambers, the high pressure control chamber 112 and a low pressure chamber, which communicates with the low pressure drain tank (not shown).
  • the actuator 102 electrically powered, comes to attract the control armature 116 and the control rod 118 fixed together.
  • the control armature 116 and the control rod 118 located in the low pressure chamber move upward against the action of a coil spring, the control rod 118 being lifted away from its seat arranged in the lower chamber. pressure.
  • the fuel can escape from the high pressure control chamber 112 to the low pressure chamber through a return passage (not shown).
  • the electromagnetic actuator 102 comprises a fixed coil assembly, the movable magnetic control armature 116 moving toward the coil assembly when electrically energized.
  • the coil spring continuously pushes the magnetic control armature 116 to a position remote from the coil assembly.
  • the control armature 116 and the control rod 118 secured together are urged by the coil spring to a position which prevents the fuel from flowing to an evacuation channel which is closed, which retains the high pressure fuel that arrives in the high pressure chamber 112.
  • the pressure in the high pressure chamber 112 rises and the needle 110 is pushed down by a needle spring and a lower end the needle 110 is in contact with the seat of the nozzle body 108 and an upper end of the needle 110 is remote from the underside of the valve body 106.

Abstract

Injecteur de carburant (100) pressurisé pour un moteur à combustion interne, l'injecteur de carburant (100) comprenant:-un ensemble de vanne de contrôle (104) comprenant un corps de vanne (106) ayant un premier conduit (120),-un corps de buse (108) comprenant un deuxième conduit (122) et des trous d'injection (115),-un écrou (109) de serrage maintenant ensemble le corps de vanne (106) et le corps de buse (108),- le premier conduit (120) et le deuxième conduit (122) s'ajustant ensemble de sorte à définir un circuit haute pression (114),caractérisé en ce que l'injecteur de carburant (100) comprend de plus une rondelle (134) serrée entre le corps de vanne (106) et le corps de buse (108), la rondelle (134) étant pourvue d'un trou (136) définissant une restriction hydraulique (136) dans le circuit haut pression (114).Pressurized fuel injector (100) for an internal combustion engine, the fuel injector (100) comprising: - a control valve assembly (104) comprising a valve body (106) having a first conduit (120), -a nozzle body (108) comprising a second conduit (122) and injection holes (115), - a nut (109) for tightening holding the valve body (106) and the nozzle body (108) together , - the first conduit (120) and the second conduit (122) fitting together so as to define a high pressure circuit (114), characterized in that the fuel injector (100) further comprises a washer (134 ) clamped between the valve body (106) and the nozzle body (108), the washer (134) being provided with a hole (136) defining a hydraulic restriction (136) in the high pressure circuit (114).

Description

DOMAINE TECHNIQUETECHNICAL AREA

La présente invention concerne généralement le domaine des injecteurs de carburant et plus précisément un injecteur équipé d'un moyen de détection de la position de l'aiguille.The present invention generally relates to the field of fuel injectors and more specifically to an injector equipped with a means for detecting the position of the needle.

ARRIERE-PLAN TECHNOLOGIQUE DE L'INVENTIONBACKGROUND OF THE INVENTION

Un injecteur de carburant comprend classiquement une aiguille pilotée en ouverture et en fermeture en fonction de la pression régnant dans une chambre de commande, laquelle pression est fonction de la position d'une électrovanne de commande. Ces petits déplacements s'effectuent à grande vitesse et, les performances régulièrement accrues nécessitent maintenant, pour un pilotage optimal, un retour d'information quant à la position réelle de l'aiguille.A fuel injector conventionally comprises a needle controlled opening and closing depending on the pressure in a control chamber, which pressure is a function of the position of a control solenoid valve. These small displacements are carried out at high speed and the regularly increased performances now require, for optimal control, feedback on the actual position of the needle.

On connait des dispositifs dans lesquels un capteur est agencé sur l'injecteur, voire un injecteur dans lequel certaines surfaces des composants du corps sont pourvues de revêtements résistifs de sorte qu'une mesure de résistance électrique puisse être réalisée entre deux éléments de l'injecteur.Devices are known in which a sensor is arranged on the injector or an injector in which certain surfaces of the body components are provided with resistive coatings so that a measurement of electrical resistance can be made between two elements of the injector. .

Pour améliorer l'injection de carburant diesel dans les cylindres d'un moteur à combustion interne, une stratégie de boucle fermée est mise en oeuvre dans laquelle une unité de commande reçoit un signal relatif à la position de l'aiguille de l'injecteur de carburant. Plusieurs dispositifs d'interrupteurs électriques ont été conçus en utilisant l'extrémité de l'aiguille et la face d'appui complémentaire pour établir un contact électrique.In order to improve the injection of diesel fuel into the cylinders of an internal combustion engine, a closed-loop strategy is implemented in which a control unit receives a signal relating to the position of the needle of the fuel injector. fuel. Several electrical switch devices have been designed using the tip of the needle and the complementary bearing face to make electrical contact.

Le dispositif d'interrupteur électrique appelé « ICL » l'acronyme anglais de « injector closed loop » qui veut dire boucle fermée d'injecteur. Le dispositif d'interrupteur électrique « ICL » est basé sur le fait que le circuit électrique de commutation est en série avec des résistances de tirage, alimentées par une tension continue. La résistance de l'injecteur est liée à la position de l'aiguille de l'injecteur et change généralement en fonction de la position de l'aiguille et du contact physique entre l'aiguille et un corps de la buse ou avec un ensemble de vanne de contrôle d'injecteur.The electrical switch device called "ICL" the acronym of "injector closed loop" which means closed injector loop. The electrical switch device "ICL" is based on the fact that the switching circuit is in series with pulling resistors powered by a DC voltage. The resistance of the injector is related to the position of the needle of the injector and generally changes depending on the position of the needle and the physical contact between the needle and a body of the nozzle or with a set of injector control valve.

Dans l'art antérieur, comme décrit dans les figures 2, 3, un injecteur 1 comprend un ensemble de vanne de contrôle 2 et un ensemble hydraulique 3. L'ensemble de vanne de contrôle 2 comprend un corps de vanne 4 et une rondelle isolante électrique 5. L'ensemble hydraulique 3 comprend un corps de buse 6. L'injecteur 1 comprend un circuit haute pression 7 ayant un premier conduit 8 agencé à l'intérieur du corps de vanne 4 et un deuxième conduit 9 agencé à l'intérieur du corps de buse 6 de l'ensemble hydraulique 3. Le premier conduit 8 du circuit haute pression comprend de plus une restriction 10 agencé près d'un orifice 11 communiquant avec la restriction 10. La restriction 10 est appelée communément NPO qui est l'acronyme anglais de « Nozzle Path Orifice» qui veut dire orifice du passage vers le corps de buse. La restriction 10 permet d'améliorer la fermeture de l'injecteur 1. La restriction 10 a un diamètre d'environ 0,55 mm. La rondelle isolante électrique 5 est comprise entre le corps de vanne 4 et le corps de buse 6. La rondelle isolante électrique 5 est revêtue d'une couche isolante électrique 12. La rondelle isolante électrique 5 est pourvue de plusieurs trous dont le trou de passage du carburant sous haute pression. Le trou de passage de la rondelle isolante électrique 5 pour le carburant haute pression a un diamètre supérieur au diamètre de la restriction 10.In the prior art, as described in Figures 2, 3 , an injector 1 comprises a control valve assembly 2 and a hydraulic assembly 3. The control valve assembly 2 comprises a valve body 4 and an electrical insulating washer 5. The hydraulic assembly 3 comprises a nozzle body 6 The injector 1 comprises a high pressure circuit 7 having a first conduit 8 arranged inside the valve body 4 and a second conduit 9 arranged inside the nozzle body 6 of the hydraulic assembly 3. The first conduit 8 of the high pressure circuit further comprises a restriction 10 arranged near an orifice 11 communicating with the restriction 10. The restriction 10 is commonly called NPO which is the acronym for "Nozzle Path Orifice" which means orifice passage towards the nozzle body. The restriction 10 improves the closure of the injector 1. The restriction 10 has a diameter of about 0.55 mm. The electrical insulating washer 5 is between the valve body 4 and the nozzle body 6. The electrical insulating washer 5 is coated with an electrical insulating layer 12. The electrical insulating washer 5 is provided with several holes including the through hole fuel under high pressure. The passage hole of the electric insulating washer 5 for the high pressure fuel has a diameter greater than the diameter of the restriction 10.

Actuellement La restriction 10 est percée avec un processus d'électroérosion. En raison de la configuration du processus, nous devons retirer une partie d'une couche isolante électrique préalablement appliqué sur une face inférieure du corps de vanne 4 avant de percer. Cette opération de décapage vient créer une zone présentant une fuite électrique préjudiciable après l'assemblage de l'injecteur 1 ou lors du fonctionnement de l'injecteur 1. Cette zone sans couche isolante électrique présente une superficie plus large que le diamètre de la restriction 10. Les assemblages ainsi réalisées présentent un manque d'isolation électrique en raison du désalignement entre la rondelle isolante électrique 5 et l'orifice 11 du premier conduit. De même la rondelle isolante électrique 5 présente un manque d'isolation électrique à chaque arête autour des trous et en particulier autour du trou de passage du carburant haute pression. Le manque d'isolation électrique de la rondelle isolante électrique 5 et de la face intérieure du corps de vanne 4 autour de la restriction 10 entraine une conductivité électrique qui nuit à la mesure de la résistance électrique de l'injecteur 1.Currently the restriction 10 is pierced with a spark erosion process. Due to the configuration of the process, we must remove a portion of an electrical insulating layer previously applied to a lower face of the valve body 4 before drilling. This stripping operation creates an area having a detrimental electrical leak after the assembly of the injector 1 or during the operation of the injector 1. This zone without electrical insulating layer has a larger area than the diameter of the restriction 10 The assemblies thus produced have a lack of electrical insulation due to the misalignment between the electrical insulating washer 5 and the orifice 11 of the first conduit. Similarly, the electrical insulating washer 5 has a lack of electrical insulation at each edge around the holes and in particular around the through hole of the high pressure fuel. The lack of electrical insulation of the electrical insulating washer 5 and the inner face of the valve body 4 around the restriction 10 causes electrical conductivity which is detrimental to the measurement of the electrical resistance of the injector 1.

L'objet de la présente invention est de fournir une solution qui résout ces inconvénients.The object of the present invention is to provide a solution that overcomes these disadvantages.

RESUME DE L'INVENTIONSUMMARY OF THE INVENTION

Un des buts de l'invention est de fournir une amélioration de l'isolation électrique de la rondelle, à l'endroit du passage du conduit haute pression, en intégrant la restriction sur la rondelle. Un injecteur de carburant pressurisé pour un moteur à combustion interne comprend un ensemble de vanne de contrôle comprenant un corps de vanne ayant un premier conduit, un corps de buse comprenant un deuxième conduit et des trous d'injection, un écrou de serrage maintenant ensemble le corps de vanne et le corps de buse, le premier conduit et le deuxième conduit s'ajustant ensemble de sorte à définir un circuit haute pression (114). L'injecteur de carburant comprend de plus une rondelle serrée entre le corps de vanne et le corps de buse, la rondelle étant pourvue d'un trou définissant une restriction hydraulique dans le circuit haut pression. La restriction hydraulique est agencée dans le passage du carburant haute pression entre le premier conduit et le deuxième conduit. La rondelle est une rondelle isolante électrique. Le trou est excentré sur la rondelle. La chute de pression dans le trou de la rondelle est régie par la formule suivante : R = D136 /D120 qui est compris entre 0,20 et 0,80, et où D120 est le diamètre du premier conduit et D136 est le diamètre du trou de la rondelle. De plus dans un mode de réalisation préféré le ratio R = D136 /D120 est égale à 0,34.One of the aims of the invention is to provide an improvement in the electrical insulation of the washer, at the location of the passage of the high pressure conduit, by integrating the restriction on the washer. A pressurized fuel injector for an internal combustion engine comprises a control valve assembly comprising a valve body having a first conduit, a nozzle body including a second conduit and injection holes, a clamping nut holding together the valve body and the nozzle body, the first conduit and the second conduit fitting together to define a high pressure circuit (114). The fuel injector further comprises a washer clamped between the valve body and the nozzle body, the washer being provided with a hole defining a hydraulic restriction in the high pressure circuit. The hydraulic restriction is arranged in the passage of high pressure fuel between the first conduit and the second conduit. The washer is an electrical insulating washer. The hole is off center on the puck. The pressure drop in the hole of the washer is governed by the following formula: R = D136 / D120 which is between 0.20 and 0.80, and where D120 is the diameter of the first duct and D136 is the diameter of the hole of the puck. In addition, in a preferred embodiment, the ratio R = D136 / D120 is equal to 0.34.

BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

D'autres caractéristiques, buts et avantages de l'invention apparaîtront à la lecture de la description détaillée qui va suivre, et en regard des dessins annexés, donnés à titre d'exemple non limitatif et sur lesquels:

  • la figure 1 est une vue en coupe d'une injecteur,
  • la figure 2 représente un vue en coupe du canal haute pression de l'injecteur selon l'art antérieur,
  • la figure 3 est une vue agrandie en coupe de la restriction du canal haute pression de l'injecteur selon l'art antérieur,
  • la figure 4 est une vue en coupe de la restriction du canal haute pression de l'injecteur selon un mode de réalisation de l'invention,
  • la figure 5 est une vue agrandie de la restriction de la rondelle de la figure 4 selon un mode de réalisation de l'invention,
Other features, objects and advantages of the invention will appear on reading the detailed description which follows, and with reference to the accompanying drawings, given by way of non-limiting example and in which:
  • the figure 1 is a sectional view of an injector,
  • the figure 2 represents a sectional view of the high pressure channel of the injector according to the prior art,
  • the figure 3 is an enlarged sectional view of the restriction of the high pressure channel of the injector according to the prior art,
  • the figure 4 is a sectional view of the restriction of the high pressure channel of the injector according to one embodiment of the invention,
  • the figure 5 is an enlarged view of the restriction of the puck of the figure 4 according to one embodiment of the invention,

DESCRIPTION DES MODES DE REALISATION PREFERESDESCRIPTION OF THE PREFERRED EMBODIMENTS

L'invention est maintenant décrite en référence aux figures et dans un but de clarté et de concision de la description une orientation de haut en bas selon le sens de la figure 1 sera utilisé sans aucune intention limitative quant à l'étendue de la protection, notamment au regard des différentes installations d'un injecteur dans un véhicule. Des mots tels que « haut, bas, en dessous, en dessus, vertical, monter, descendre ... » seront utilisés sans intention limitative.The invention is now described with reference to the figures and for the sake of clarity and brevity of the description a top-down orientation according to the direction of the figure 1 will be used without any limiting intention as to the extent of the protection, in particular with regard to the various installations of an injector in a vehicle. Words such as "up, down, below, above, vertical, up, down ..." will be used without limiting intent.

La figure 1 illustre un injecteur 100 s'étendant le long d'un axe longitudinal X. L'injecteur 100 comprend un actionneur 102 piloté par un calculateur (non représenté) agencé dans la partie supérieure de l'injecteur 100, un ensemble de vanne de contrôle 104 et une partie hydraulique agencée dans la partie inférieure de l'injecteur 100. L'ensemble vanne de contrôle 104 comprend un corps de vanne 106 de contrôle, une soupape de commande et une chambre basse pression. La partie hydraulique de l'injecteur 100 comprend un corps de buse 108, une aiguille 110 et une chambre haute pression 112 dans laquelle se trouve une extrémité supérieure de l'aiguille 110. L'injecteur comprend de plus un écrou 109. L'écrou 109 de serrage maintient ensemble le corps de vanne 106 et le corps de buse 108. L'injecteur 100 est pourvu d'un circuit haute pression 114 qui permet au carburant de s'écouler d'une entrée jusqu'à des trous d'injection 115 agencés dans une partie inférieure du corps de buse 108 et un circuit de retour basse pression qui permet au carburant non injecté, également identifié comme une fuite de retour, de refluer vers une sortie.The figure 1 illustrates an injector 100 extending along a longitudinal axis X. The injector 100 comprises an actuator 102 controlled by a computer (not shown) arranged in the upper part of the injector 100, a control valve assembly 104 and a hydraulic part arranged in the lower part of the injector 100. The control valve assembly 104 comprises a control valve body 106, a control valve and a low pressure chamber. The hydraulic part of the injector 100 comprises a nozzle body 108, a needle 110 and a high pressure chamber 112 in which there is an upper end of the needle 110. The injector further comprises a nut 109. The nut The injector 100 holds together the valve body 106 and the nozzle body 108. The injector 100 is provided with a high pressure circuit 114 which allows the fuel to flow from an inlet to injection holes. 115 arranged in a lower portion of the nozzle body 108 and a low pressure return circuit which allows the uninjected fuel, also identified as a return leak, to flow back to an outlet.

Selon les figures 1, 4 et 5, la soupape de commande comprend une armature de commande 116 et une tige de commande 118 fixés entre eux. Le corps de vanne 106 de contrôle est pourvu d'un premier conduit 120. Le corps de buse 108 est pourvu d'un deuxième conduit 122. Le premier conduit 120 et le deuxième conduit 122 s'ajustent ensemble de sorte à définir le circuit haute pression 114. Le premier conduit 120 du circuit haute pression 114 débouche des deux côtés du corps de vanne 106 de contrôle. Le premier conduit 120 comprend un orifice 133 agencé du côté d'une face inférieure du corps de vanne 106 de contrôle. L'injecteur de carburant 100 comprend de plus une rondelle 134 serrée entre le corps de vanne 106 et le corps de buse 108. La rondelle 134 est pourvue d'un trou 136 définissant une restriction hydraulique 136 dans le circuit haut pression 114. Le trou 136 de la rondelle est excentré et aligné sur l'orifice 133 du premier conduit 120. La rondelle 134 est isolante électriquement. La rondelle 134 est en contact avec une face inférieure du corps de vanne 106. Le diamètre de l'orifice 133 est plus grand que le diamètre du trou 136 de la rondelle 134 isolante électrique. Le trou 136 génère une chute de pression de sorte que la pression dans la chambre haute pression 112 est supérieure à la pression dans la chambre basse pression. La chute de pression dans le trou 136 de la rondelle est régie par un ratio R dont la formule est la suivante:
R = D136 /D120 est compris entre 0,20 et 0,80, et où D120 est le diamètre du premier conduit 120 et D136 est le diamètre du trou 136 de la rondelle. Dans l'exemple représenté dans les figures 4 et 5, le ratio R = D136/D120 est égale à 0,34 où le diamètre D120 du premier conduit est égale à 1,60 mm et le diamètre D136 du trou 136 est égale à 0,55 mm.According to figures 1 , 4 and 5 , the control valve comprises a control armature 116 and a control rod 118 fixed to each other. The control valve body 106 is provided with a first conduit 120. The nozzle body 108 is provided with a second conduit 122. The first conduit 120 and the second conduit 122 adjust together to define the high circuit. pressure 114. The first conduit 120 of the high pressure circuit 114 opens on both sides of the body of 106 control valve. The first conduit 120 comprises an orifice 133 arranged on the side of a lower face of the control valve body 106. The fuel injector 100 further comprises a washer 134 clamped between the valve body 106 and the nozzle body 108. The washer 134 is provided with a hole 136 defining a hydraulic restriction 136 in the high pressure circuit 114. The hole 136 of the washer is eccentric and aligned with the orifice 133 of the first conduit 120. The washer 134 is electrically insulating. The washer 134 is in contact with a lower face of the valve body 106. The diameter of the orifice 133 is larger than the diameter of the hole 136 of the electrical insulating washer 134. The hole 136 generates a pressure drop so that the pressure in the high pressure chamber 112 is greater than the pressure in the low pressure chamber. The pressure drop in the hole 136 of the washer is governed by a ratio R whose formula is as follows:
R = D136 / D120 is between 0.20 and 0.80, and where D120 is the diameter of the first conduit 120 and D136 is the diameter of the hole 136 of the washer. In the example shown in Figures 4 and 5 , the ratio R = D136 / D120 is equal to 0.34 where the diameter D120 of the first duct is equal to 1.60 mm and the diameter D136 of the hole 136 is equal to 0.55 mm.

La rondelle 134 est isolante électriquement. Dans l'exemple décrit dans les figures 4 et 5, la rondelle 134 isolante électrique comprend une couche isolante électrique d'une épaisseur d'au moins 0,001 mm. La couche isolante électrique peut être un oxyde d'aluminium.The washer 134 is electrically insulating. In the example described in Figures 4 and 5 , the electric insulating washer 134 comprises an electrical insulating layer having a thickness of at least 0.001 mm. The electrical insulating layer may be an aluminum oxide.

En fonctionnement, l'injecteur 100 comprend l'aiguille 110 coulissante dans un alésage comme représenté sur la figure 1. Le mouvement de l'aiguille 110 est contrôlé à l'aide de deux chambres, la chambre à haute pression 112 de commande et une chambre à basse pression, qui communique avec le réservoir de vidange à basse pression (non représenté). Lorsque débute l'injection, l'actionneur 102, alimenté électriquement, vient attirer l'armature de commande 116 et la tige de commande 118 fixés ensemble. L'armature de commande 116 et la tige de commande 118 situés dans la chambre basse pression se déplacent vers le haut contre l'action d'un ressort de bobine, la tige de commande 118 se soulevant loin de son siège agencé dans la chambre basse pression. En conséquence, le carburant peut s'échapper de la chambre à haute pression 112 de commande vers la chambre à basse pression par un passage de retour (non représenté). Comme représenté dans la figure 1, l'actionneur 102 électromagnétique comprend un ensemble de bobine fixe, l'armature de commande 116 magnétique mobile se déplaçant vers l'ensemble de bobine lorsque celle-ci est électriquement alimentée. De plus le ressort de bobine repousse en permanence l'armature de commande 116 magnétique vers une position éloignée de l'ensemble de bobine. Lorsque l'actionneur 102 n'est pas alimenté, l'armature de commande 116 et la tige de commande 118 fixés ensemble sont repoussées par le ressort de bobine vers une position qui empêche au carburant de s'écouler vers un canal d'évacuation qui est fermé, ce qui retient le carburant à haute pression qui arrive dans la chambre haute pression 112. Alors la pression dans la chambre haute pression 112 remonte et l'aiguille 110 est repoussée vers le bas par un ressort d'aiguille et une extrémité inférieure de l'aiguille 110 est en contact avec le siège du corps de buse 108 et une extrémité supérieure de l'aiguille 110 est éloignée de la face inférieure du corps de vanne 106.In operation, the injector 100 comprises the needle 110 sliding in a bore as shown in FIG. figure 1 . The movement of the needle 110 is controlled by two chambers, the high pressure control chamber 112 and a low pressure chamber, which communicates with the low pressure drain tank (not shown). When the injection begins, the actuator 102, electrically powered, comes to attract the control armature 116 and the control rod 118 fixed together. The control armature 116 and the control rod 118 located in the low pressure chamber move upward against the action of a coil spring, the control rod 118 being lifted away from its seat arranged in the lower chamber. pressure. As a result, the fuel can escape from the high pressure control chamber 112 to the low pressure chamber through a return passage (not shown). As shown in the figure 1 the electromagnetic actuator 102 comprises a fixed coil assembly, the movable magnetic control armature 116 moving toward the coil assembly when electrically energized. In addition, the coil spring continuously pushes the magnetic control armature 116 to a position remote from the coil assembly. When the actuator 102 is not energized, the control armature 116 and the control rod 118 secured together are urged by the coil spring to a position which prevents the fuel from flowing to an evacuation channel which is closed, which retains the high pressure fuel that arrives in the high pressure chamber 112. Then the pressure in the high pressure chamber 112 rises and the needle 110 is pushed down by a needle spring and a lower end the needle 110 is in contact with the seat of the nozzle body 108 and an upper end of the needle 110 is remote from the underside of the valve body 106.

LISTE DES REFERENCES UTILISEESLIST OF REFERENCES USED

11
injecteurinjector
22
ensemble de vanne de contrôlecontrol valve assembly
33
corps de vannevalve body
44
ensemble hydrauliquehydraulic assembly
55
rondelle isolante electriqueelectrical insulating washer
66
corps de busenozzle body
77
circuit haute pressionhigh pressure circuit
88
premier conduitfirst conduit
99
deuxième conduitsecond conduit
1010
restrictionrestriction
1111
orificeorifice
1212
couche isolante électriqueelectrical insulating layer
100100
InjecteurInjector
102102
actionneuractuator
104104
ensemble de vanne de contrôlecontrol valve assembly
106106
corps de vannevalve body
108108
corps de busenozzle body
109109
écrounut
110110
aiguilleneedle
112112
chambre haute pressionhigh pressure chamber
114114
circuit haute pressionhigh pressure circuit
115115
trous d'injectioninjection holes
116116
armature de commandecontrol frame
118118
tige de commandecontrol rod
120120
premier conduitfirst conduit
122122
deuxième conduitsecond conduit
133133
orificeorifice
134134
rondellewasher
136136
trou de la rondellewasher hole

Claims (3)

Injecteur de carburant (100) pressurisé pour un moteur à combustion interne, l'injecteur de carburant (100) comprenant: - un ensemble de vanne (104) de contrôle comprenant un corps de vanne (106) ayant un premier conduit (120) avec D120 le diamètre du premier conduit (120) ; - un corps de buse (108) comprenant un deuxième conduit (122) et des trous d'injection 115, - un écrou (109) de serrage maintenant ensemble le corps de vanne (106) et le corps de buse (108), - le premier conduit (120) ayant un diamètre (D120) et le deuxième conduit (122) s'ajustant ensemble de sorte à définir un circuit haute pression (114), caractérisé en ce que l'injecteur de carburant (100) comprend de plus une rondelle (134) serrée entre le corps de vanne (106) et le corps de buse (108), la rondelle (134) étant pourvue d'un trou (136) définissant une restriction hydraulique (136) dans le circuit haut pression (114) et le trou (136) ayant un diamètre (D136), la chute de pression dans le trou (136) de la rondelle (134) étant régie par la formule suivante :
R = D136 /D120 compris entre 0,20 et 0,80, de préférence R = D136 /D120 égale à 0,34.A fuel injector (100) pressurized for an internal combustion engine, the fuel injector (100) comprising: a control valve assembly (104) comprising a valve body (106) having a first conduit (120) with D120 the diameter of the first conduit (120); a nozzle body (108) comprising a second conduit (122) and injection holes 115, a tightening nut (109) holding together the valve body (106) and the nozzle body (108), the first conduit (120) having a diameter (D120) and the second conduit (122) fitting together to define a high pressure circuit (114), characterized in that the fuel injector (100) further comprises a washer (134) clamped between the valve body (106) and the nozzle body (108), the washer (134) being provided with a hole ( 136) defining a hydraulic restriction (136) in the high pressure circuit (114) and the hole (136) having a diameter (D136), the pressure drop in the hole (136) of the washer (134) being governed by the following formula:
R = D136 / D120 between 0.20 and 0.80, preferably R = D136 / D120 equal to 0.34. Injecteur de carburant (100) selon la revendication précédente, dans lequel la rondelle (134) est une rondelle isolante électrique.Fuel injector (100) according to the preceding claim, wherein the washer (134) is an electric insulating washer. Injecteur de carburant (100) selon l'une quelconque des revendications 1 à 2, dans lequel le trou (136) est excentré sur la rondelle (134).The fuel injector (100) according to any one of claims 1 to 2, wherein the hole (136) is eccentric on the washer (134).
EP18208348.5A 2017-12-21 2018-11-26 Fuel injector Withdrawn EP3502459A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1762859A FR3075887A1 (en) 2017-12-21 2017-12-21 FUEL INJECTOR

Publications (1)

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EP3502459A1 true EP3502459A1 (en) 2019-06-26

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ID=61258490

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EP18208348.5A Withdrawn EP3502459A1 (en) 2017-12-21 2018-11-26 Fuel injector

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FR (1) FR3075887A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0957262A2 (en) * 1998-05-13 1999-11-17 LUCAS INDUSTRIES public limited company Fuel injector
DE102005024871A1 (en) * 2005-05-31 2006-12-07 Siemens Ag Injector for diesel fuel has a control chamber, which is subjected to fluid pressure whereby nozzle needle or tappet of nozzle needle of injector is coupled fluid mechanically with servo valve
US20090184185A1 (en) * 2008-01-23 2009-07-23 Caterpillar Inc. Fuel injector and method of assembly therefor
DE102009028262A1 (en) * 2009-08-05 2011-02-10 Robert Bosch Gmbh High pressure loaded component i.e. fuel injector, pressure resistance increasing method for self-ignition internal combustion engine, involves producing autofrettage pressure of seven kilo bars inside assembly group
WO2017186956A1 (en) * 2016-04-29 2017-11-02 Delphi International Operations Luxembourg S.À R.L. Fuel injector
WO2017186819A1 (en) * 2016-04-29 2017-11-02 Delphi International Operations Luxembourg S.À R.L. Fuel injector

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0957262A2 (en) * 1998-05-13 1999-11-17 LUCAS INDUSTRIES public limited company Fuel injector
DE102005024871A1 (en) * 2005-05-31 2006-12-07 Siemens Ag Injector for diesel fuel has a control chamber, which is subjected to fluid pressure whereby nozzle needle or tappet of nozzle needle of injector is coupled fluid mechanically with servo valve
US20090184185A1 (en) * 2008-01-23 2009-07-23 Caterpillar Inc. Fuel injector and method of assembly therefor
DE102009028262A1 (en) * 2009-08-05 2011-02-10 Robert Bosch Gmbh High pressure loaded component i.e. fuel injector, pressure resistance increasing method for self-ignition internal combustion engine, involves producing autofrettage pressure of seven kilo bars inside assembly group
WO2017186956A1 (en) * 2016-04-29 2017-11-02 Delphi International Operations Luxembourg S.À R.L. Fuel injector
WO2017186819A1 (en) * 2016-04-29 2017-11-02 Delphi International Operations Luxembourg S.À R.L. Fuel injector

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