WO2009086997A1 - Injecteur de combustible - Google Patents

Injecteur de combustible Download PDF

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Publication number
WO2009086997A1
WO2009086997A1 PCT/EP2008/066708 EP2008066708W WO2009086997A1 WO 2009086997 A1 WO2009086997 A1 WO 2009086997A1 EP 2008066708 W EP2008066708 W EP 2008066708W WO 2009086997 A1 WO2009086997 A1 WO 2009086997A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
fuel injection
spring element
actuator
spring
Prior art date
Application number
PCT/EP2008/066708
Other languages
German (de)
English (en)
Inventor
Cetin Irmak
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to CN200880124435XA priority Critical patent/CN101910607A/zh
Priority to EP08870377A priority patent/EP2232045B1/fr
Publication of WO2009086997A1 publication Critical patent/WO2009086997A1/fr

Links

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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating 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
    • 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
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing

Definitions

  • the invention relates to a fuel injection valve with a piezoelectric actuator. Specifically, the invention relates to the field of injectors for fuel injection systems of air compressing, self-igniting internal combustion engines.
  • an injector for fuel injection systems of internal combustion engines in particular direct injection diesel engines is known.
  • a arranged in an injector piezoelectric actuator is provided, which is held on first spring means on the one hand with the injector body and on the other hand with a sleeve-like booster piston in abutment.
  • a nozzle body connected to the injector body and having a nozzle discharge opening is provided, in which a graduated nozzle needle is guided in an axially displaceable manner.
  • second spring means are arranged within the booster piston, which hold the nozzle needle in the closed position together with the injection pressure acting on the back of the nozzle needle.
  • a control chamber formed at a nozzle needle-side end of the booster piston communicates with a fuel supply under injection pressure one
  • Leak gap in connection wherein the nozzle needle is acted upon by the fuel located in the control chamber in the opening direction.
  • a control of the nozzle needle can be achieved by the piezoelectric actuator.
  • the known from DE 103 26 259 Al injector has the disadvantage that gaseous components, in particular air, which may be provided in the field of the booster piston, for example, when starting the engine affect the performance, at least for a certain start time. This can lead to problems when starting the internal combustion engine, especially after longer periods.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that a reliable operation is possible even in a start-up phase or after longer periods. Specifically, the reliability of the fuel injection valve and thus an internal combustion engine having such a fuel injection valve can be improved.
  • valve sleeve has a support cap and that the actuator within the valve sleeve is arranged and supported from the inside to the support cap.
  • valve piece is provided, which rests against the second side of the throttle plate, and that the valve piece is partially surrounded circumferentially of the valve sleeve. It is also advantageous that between the valve piece and the valve sleeve, an annular second control chamber is formed, in which the extended through the valve piece outlet throttle opens.
  • the second spring element is arranged together with the piezoelectric actuator within the valve sleeve, wherein the second spring element is supported on the one hand on the valve piece and on the other hand rests at least indirectly on the actuator. Temperature and thus length changes of components of the fuel injection valve can be compensated by the first spring element and the second spring element. Further, it is advantageous that the second spring element is configured relatively hard, while the first spring element is configured relatively soft, that is, that a Spring constant of the first spring element smaller, in particular significantly smaller, is as a spring constant of the second spring element.
  • the spring elements are preferably designed as a tube springs, whereby in particular an axially symmetric deflection and an axially symmetrical application of force of the spring elements is achieved.
  • the valve sleeve is preferably provided with one or more holes which form openings to connect the interior of the valve sleeve with the actuator chamber, so that the exchange of a medium, in particular an escape of gaseous components, especially air, is possible.
  • Fig. 1 is a fuel injection valve with a piezoelectric actuator in a schematic
  • Fig. 1 shows a fuel injection valve 1 with a piezoelectric actuator 2 according to an embodiment of the invention.
  • Fuel injection valve 1 can serve in particular as an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • a preferred use of the fuel injection valve 1 is for a fuel injection system with a common rail, the diesel fuel under high pressure leads to a plurality of fuel injection valves 1.
  • the fuel injection valve 1 according to the invention is also suitable for other applications.
  • the fuel injection valve 1 has a valve housing 3.
  • a high-pressure bore 4 is designed, can be guided through the high-pressure fuel in a fuel chamber 5 in the interior of the valve housing 3.
  • a section 6 of the high-pressure bore 4 leads through a throttle plate 7, which is connected in a suitable manner to the valve housing 3.
  • From the high-pressure bore 4 branches off an inlet throttle 8, which is configured in the throttle plate 7.
  • the inlet throttle 8 carries fuel into a control chamber 9 which is delimited by a first side 10 of the throttle plate 7, a control chamber sleeve 12 and an end face 13 of a valve needle 14. In the initial state is thus in the control chamber 9 under high pressure fuel, so that the valve needle 14 is pressed in the direction of a valve seat body 15.
  • a valve seat surface 16 is formed, which cooperates with the valve needle 14 to form a sealing seat.
  • an actuator chamber 20 is also formed.
  • the actuator chamber 20 is located on one of the first side 10 facing away from the second side 11 of the Throttle plate 7.
  • a valve sleeve 21 and a valve member 22 are arranged, wherein the valve member 22 is located directly on the second side 11 of the throttle plate 7.
  • a bore portion 23 is formed, which extends an outlet throttle 24 formed in the throttle plate 7.
  • the outlet throttle 24 thereby connects the control chamber 9 with an annular second control chamber 25, which is formed between the valve member 22 and the valve sleeve 21.
  • an annular groove is formed on a cylinder jacket-shaped outer side 26 of the valve piece 22 for the design of the second control chamber 25.
  • the valve piece 22 has a shoulder 27, which forms a valve seat with respect to the valve sleeve 21, so that in the initial position shown in FIG. 1, the second control chamber 25 is separated from the rest of the actuator chamber 20.
  • the actuator chamber 20 is connected via a return bore 28 to a tank of the fuel injection system, so that there is a relatively low pressure at the return bore 28.
  • the fuel provided in the actuator chamber 20 is under low pressure.
  • the second control chamber 25 is in the starting position under high pressure.
  • the valve sleeve 21 has an inner space 30, which is bounded on the one hand by the valve piece 22 and on the other hand by a support cap 31 of the valve sleeve 21 and circumferentially by a wall 32 of the valve sleeve 21.
  • bores 33, 34 are provided, so that a connection between the interior 30 of the valve sleeve 21 and the actuator chamber 20 is made.
  • the bore 34 forms an opening 35 in the valve piece 22, via which a balance between the inner space 30 of the valve sleeve 21 and the Actuator 20 exists.
  • a first spring element 40 is also arranged, which is designed as a tube spring.
  • the first spring element 40 is supported on the one hand on the valve housing 3 and on the other hand on the support cap 31 of the valve sleeve 21.
  • the first spring element 40 has a certain prestress, so that the valve sleeve 21 is pressed against the shoulder 27 of the valve piece 22, so that the valve seat formed between the valve piece 22 and the valve sleeve 21 is closed.
  • the piezoelectric actuator 2 and a second spring element 41 are arranged in the inner space 30 of the valve sleeve 21, the piezoelectric actuator 2 and a second spring element 41 are arranged.
  • the piezoelectric actuator 2 is supported on the support cap 31 of the valve sleeve 21, while the second spring element 41 is supported on the one hand on the valve member 22 and on the other hand rests against the piezoelectric actuator 2.
  • the second spring element 41 has a certain bias, so that the piezoelectric actuator 2 is biased.
  • the spring elements 40, 41 are preferably configured differently.
  • the first spring element 40 is soft, while the second spring element 41 is designed hard. That is, the first spring element 40 preferably has a smaller spring constant than the second spring element 41. Specifically, there is a relatively large difference in the spring constant of the spring elements 40, 41. This has the advantage that upon actuation of the piezoelectric actuator 2 of the Actuator 2 generated stroke at least substantially for shortening, that is, deflection, the first spring element 40 leads, while the second spring element 41 is not shortened as possible.
  • the stroke of the piezoelectric actuator 2 is at least substantially used for opening the valve seat formed between the valve sleeve 21 and the shoulder 27 of the valve piece 22 in order to partially or completely release the second control chamber 25.
  • the first spring element 40 in the de-energized and thus unactuated state of the piezoelectric actuator 2 a higher spring force than the second spring element 41st
  • the second spring element 41 Upon actuation of the piezoelectric actuator 2, first, the second spring element 41 is shortened until the biasing force of the first spring element 40 is reached. Then, the first spring element 40 is compressed and thus shortened, so that the valve sleeve 21 is lifted from the valve seat formed on the shoulder 27. If then the spring force of the first spring element 40 is again greater than the spring force of the second spring element 41, the second spring element 41 is again compressed until it again exceeds the spring force of the first spring element 40. So the first spring element 40 is gradually compressed. Thus, therefore, the valve sleeve 21 is gradually raised. Thus, the second storage space 25 is opened to the actuator chamber 20, so that the outlet throttle 24 is released and the pressure of the fuel in the control chamber 9 decreases. The force effectively acting on the valve needle 14 is then executed to the control chamber 9, so that the valve needle 14 is lifted from its valve seat on the valve seat surface 16 and fuel from the fuel chamber 5 via the open sealing seat and the nozzle opening 42 is hosed.
  • the fuel injection valve 1 has an axis 45.
  • the piezoelectric actuator 2 with respect to the axis 45 of the fuel injection valve 1 can be centered.
  • the spring elements 40, 41 can be aligned with respect to the axis 45, wherein a symmetrical force development of the spring elements 40, 41 is achieved by the design of the spring elements 40, 41 as a tube springs. This results in a compact design and high reliability of the fuel injection valve 1.
  • gaseous components, in particular air which are present in particular in a start phase of the fuel injection valve in the valve housing 3, can be removed in an advantageous manner.
  • the fuel injection valve 1 when the fuel injection valve 1 is put into operation via the inlet throttle 8, first the control chamber 9 and thus also via the outlet throttle 24 the second control chamber 25 is filled with fuel under high pressure. Gaseous components are displaced from the control chambers 9, 25. As a result, the functionality of the fuel injection valve 1 is guaranteed from the beginning. Problems when starting the internal combustion engine are prevented.
  • the invention is not limited to the described embodiments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

La présente invention concerne un injecteur de combustible (1) qui est de préférence réalisé sous la forme d'injecteur pour les systèmes d'injection de combustible de moteurs à combustion interne à compression d'air et allumage spontané. L'injecteur de combustible (1) présente un actionneur piézoélectrique (2) et une aiguille (14) pouvant être indirectement actionnée par l'actionneur (2). En outre, on a prévu une plaquette d'étranglement (7) avec un papillon d'amenée (8) et un papillon d'évacuation (24) qui débouchent dans une chambre de commande (9). La chambre de commande (9) est délimitée par une surface frontale (13) de l'aiguille (14) et un premier côté (10) de la plaquette d'étranglement (7). Par ailleurs, pour la commande du papillon d'évacuation (24), on a prévu un manchon de soupape (21) sur un second côté (11) de la plaquette d'étranglement (7) opposé au premier côté (10) de la plaquette d'étranglement (7), manchon qui peut être actionné par l'actionneur (2) pour débloquer le papillon d'évacuation (24) contre la force élastique d'un premier élément de ressort (40), l'actionneur (2) pouvant être actionné contre la force élastique d'un second élément à ressort (41). Lors du déblocage du papillon d'évacuation (24), la pression régnant dans la chambre de commande (9) diminue, si bien que l'aiguille (14) est actionnée.
PCT/EP2008/066708 2008-01-10 2008-12-03 Injecteur de combustible WO2009086997A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200880124435XA CN101910607A (zh) 2008-01-10 2008-12-03 燃料喷射阀
EP08870377A EP2232045B1 (fr) 2008-01-10 2008-12-03 Injecteur de combustible

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810003851 DE102008003851A1 (de) 2008-01-10 2008-01-10 Brennstoffeinspritzventil
DE102008003851.2 2008-01-10

Publications (1)

Publication Number Publication Date
WO2009086997A1 true WO2009086997A1 (fr) 2009-07-16

Family

ID=40379811

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/066708 WO2009086997A1 (fr) 2008-01-10 2008-12-03 Injecteur de combustible

Country Status (4)

Country Link
EP (1) EP2232045B1 (fr)
CN (1) CN101910607A (fr)
DE (1) DE102008003851A1 (fr)
WO (1) WO2009086997A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012083459A1 (fr) * 2010-12-21 2012-06-28 Tpp Energy Solutions Inc. Dispositif pour augmenter le rendement d'un moteur à combustion interne

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104653374B (zh) * 2015-02-11 2017-04-12 江苏大学 一种分体式喷油器体
DE102016221547A1 (de) * 2016-11-03 2018-05-03 Robert Bosch Gmbh Brennstoffeinspritzventil zum Einspritzen eines gasförmigen und/oder flüssigen Brennstoffs

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10326259A1 (de) * 2003-06-11 2005-01-05 Robert Bosch Gmbh Injektor für Kraftstoff-Einspritzsysteme von Brennkraftmaschinen, insbesondere von direkteinspritzenden Dieselmotoren
EP1612403A1 (fr) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Soupape servo pour controller l'injecteur d'un moteur à combustion interne
EP1693564A2 (fr) * 2005-02-18 2006-08-23 Robert Bosch Gmbh Injecteur de carburant à commande de pointeau directe pour un moteur à combustion interne
DE102005059437A1 (de) * 2005-12-13 2007-06-14 Robert Bosch Gmbh Kraftstoffinjektor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10326259A1 (de) * 2003-06-11 2005-01-05 Robert Bosch Gmbh Injektor für Kraftstoff-Einspritzsysteme von Brennkraftmaschinen, insbesondere von direkteinspritzenden Dieselmotoren
EP1612403A1 (fr) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Soupape servo pour controller l'injecteur d'un moteur à combustion interne
EP1693564A2 (fr) * 2005-02-18 2006-08-23 Robert Bosch Gmbh Injecteur de carburant à commande de pointeau directe pour un moteur à combustion interne
DE102005059437A1 (de) * 2005-12-13 2007-06-14 Robert Bosch Gmbh Kraftstoffinjektor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012083459A1 (fr) * 2010-12-21 2012-06-28 Tpp Energy Solutions Inc. Dispositif pour augmenter le rendement d'un moteur à combustion interne

Also Published As

Publication number Publication date
EP2232045A1 (fr) 2010-09-29
EP2232045B1 (fr) 2013-02-20
CN101910607A (zh) 2010-12-08
DE102008003851A1 (de) 2009-07-16

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