EP1552136A1 - Dispositif d'injection de carburant destine a un moteur a combustion interne - Google Patents

Dispositif d'injection de carburant destine a un moteur a combustion interne

Info

Publication number
EP1552136A1
EP1552136A1 EP03740027A EP03740027A EP1552136A1 EP 1552136 A1 EP1552136 A1 EP 1552136A1 EP 03740027 A EP03740027 A EP 03740027A EP 03740027 A EP03740027 A EP 03740027A EP 1552136 A1 EP1552136 A1 EP 1552136A1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel injection
injection device
control chamber
valve element
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.)
Granted
Application number
EP03740027A
Other languages
German (de)
English (en)
Other versions
EP1552136B1 (fr
Inventor
Friedrich Boecking
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.)
Robert Bosch GmbH
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
Publication of EP1552136A1 publication Critical patent/EP1552136A1/fr
Application granted granted Critical
Publication of EP1552136B1 publication Critical patent/EP1552136B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0028—Valves characterised by the valve actuating means hydraulic
    • F02M63/0029—Valves characterised by the valve actuating means hydraulic using a pilot valve controlling a hydraulic chamber
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • 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
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0005—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using valves actuated by fluid 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
    • 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
    • F02M63/0059—Arrangements of valve actuators
    • F02M63/0061—Single actuator acting on two or more valve bodies
    • 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
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the invention relates to a fuel injection device for an internal combustion engine, with a housing, with a recess in the housing, with at least two coaxially arranged in the recess
  • Valve elements which each cooperate with a corresponding valve seat and which are each assigned at least one corresponding fuel outlet opening.
  • Such a fuel injection device is known from DE 40 23 223 AI.
  • a fuel injector for internal combustion engines is shown.
  • Two valve needles are arranged coaxially to one another. Both valve needles each have a pressure surface.
  • the pressure surfaces of the valve needles each delimit a pressure chamber, which is connected to a flow channel through which the fuel pressure chamber can flow.
  • the printing areas are aligned so that with a When pressurized, lift the valve needles from the seat assigned to them, thereby releasing the corresponding openings at the end of the injection nozzle.
  • the valve needles can be controlled independently of each other via the two independent flow channels.
  • the object of the present invention is to develop a fuel injection device for an internal combustion engine of the type mentioned at the outset in such a way that it is as simple and compact as possible.
  • the fuel injection device according to the invention only requires one common valve device for operation, with which all valve elements can be controlled at least indirectly. It is therefore comparatively compact. Furthermore, since a comparatively small number of parts is required, their manufacture is also inexpensive.
  • the fact that the common valve device provided in accordance with the invention has three switch positions enables a high degree of flexibility in the operation of the fuel injection device according to the invention.
  • the common valve device covers all essential switching states of a fuel injection device with two valve elements.
  • the fuel injection device is therefore compact on the one hand and on the other hand enables the internal combustion engine to be operated with optimal emissions and consumption.
  • the common valve device comprises a 3/3-way valve which is connected to a low pressure connection, a control chamber of the first valve element, and a control chamber of a hydraulically switchable valve device, which in turn is connected to a control chamber of a valve element and to a high pressure connection is.
  • a flow restrictor is arranged in the flow path between the control chamber of the hydraulically switchable valve device and the common valve device.
  • the off characteristics of the hydraulically switchable valve device and thus also the opening characteristics of the second valve element are influenced by these. Above all, this enables the combustion noise of the internal combustion engine to be optimized.
  • valve element is pressure-controlled and the other valve element is stroke-controlled.
  • the respective advantages of pressure-controlled or stroke-controlled valve elements can be combined in a single fuel injection device.
  • a pressure-controlled valve element has a particularly favorable injection characteristic, in particular in part-load operation of the internal combustion engine.
  • the control of the pressure-controlled valve element is simplified in that the pressure-controlled valve element is arranged radially outside of the stroke-controlled valve element.
  • control chamber of the pressure-controlled valve element is connected to the hydraulically switchable valve device.
  • Figure 1 is a schematic representation of a
  • Figure 2 is a partial section through one of the
  • FIG. 3 shows an enlarged illustration of a region of the fuel injection device from FIG. 2.
  • a power-fueling system bears the reference number 10 overall. It comprises a fuel tank 12, from which an electric fuel pump 14 requests the fuel m from a low-pressure fuel line 16.
  • Low-pressure fuel supply 16 leads to a high-pressure fuel pump 18.
  • This is a piston pump which is driven by a camshaft (not shown) of the internal combustion engine to which the fuel system 10 belongs.
  • High-pressure fuel pump 18 prompts in a fuel rail 20, in which the fuel is stored under high pressure.
  • a plurality of injectors 22 are connected to the fuel collecting line 20 and inject the fuel directly into the combustion chambers 24 of the internal combustion engine that are assigned to them.
  • the operation of the internal combustion engine and the fuel system 10 is controlled and regulated by a control and regulating device 26.
  • the injectors 22 are also controlled by the control and regulating device 26.
  • a line 28 leads from the injectors 22 back to the fuel tank 12.
  • a region of one of the injectors 22 is shown in detail in FIG. 2:
  • the injector 22 comprises a two-part housing with an upper part 30 and a lower part 32.
  • a recess 34 in which, among other things, a first elongated valve element 36 is present. Its lower end in FIG. 2 is tapered to a point and works with a valve seat 38 (see FIG. 3) in the lower part 32 of the housing.
  • a second valve element 40 Coaxial to the first Valve element 36 and radially outside of this there is a second valve element 40, the likewise conical tip of which cooperates with a valve seat 42 in the lower part 32 of the housing.
  • the first valve element 36 is acted upon by a compression spring 44, one end of which is supported on a shoulder (without reference number) in the upper part 30 of the housing, in the direction of the valve seat 38.
  • the second valve element 40 is acted upon by a compression spring 46 in the direction of the corresponding valve seat 42.
  • the compression spring 46 is not supported directly on a shoulder in the recess 34 in the upper part 30 of the housing, but on an intermediate ring 48.
  • the recess 34 in the lower part 32 of the housing comprises a blind hole 50, from which a plurality of outlet openings 52 lead to the outside. Through these outlet openings 52, the fuel, as will be explained in greater detail below, occurs when the first is open
  • Outlet openings 54 serve analogously to the outlet of the fuel when only the second valve element 40 is lifted off the second valve seat 42. This will also be explained in more detail below.
  • a common valve device 56 is provided, which is arranged in the upper region of the upper part 34 of the housing. This comprises a semi-spherically shaped valve element 58, which is arranged in a switching chamber 60. Via a tappet 62, the valve element 60 can be moved from a piezo actuator 64 shown only symbolically different switch positions can be adjusted.
  • valve element 58 In the rest position, the valve element 58 is pressed against a valve seat 68 by a compression spring 66. If the valve element 58 abuts the valve seat 68, the
  • connection from the switching chamber 60 via a channel 70 to a low-pressure connection 72 is interrupted.
  • the low-pressure connection 72 is in turn connected to the return line 28 / which leads back to the fuel tank 12.
  • a channel 74 leads from the lower end wall of the switching chamber 60 in FIG. 2 to a control chamber 76.
  • the upper end of the first valve element 36 with a pressure surface 78 in FIG. 2 also opens into the control chamber 76.
  • a flow restrictor 80 is present in the channel 74. From the radial boundary wall (without reference number) of the switching chamber 60, a fluid connection (without reference number) leads via a flow restrictor 82 to a control chamber 84 of a hydraulically actuated switching valve 86.
  • the hydraulically actuated switching valve 86 likewise comprises a switching chamber 88 in which a valve element 90 is arranged.
  • the valve element 90 is generally cylindrical with a switching section 92, which has a circular cylindrical diameter, a transition section 94, which is designed like a constriction, and a circular cylindrical guide section 96.
  • One end of a compression spring 98 is supported on a closure part 100.
  • the other end of the compression spring 98 acts on the valve element 90 in the direction of the control chamber 84.
  • An annular groove 102 is provided in the peripheral wall of the switching chamber 88. On the one hand, this is connected via a channel 104 to a high-pressure connection 106 (cf. also FIG. 1). This in turn leads to the fuel collecting line 20.
  • a channel 108 leads via a flow restrictor 110 from the annular groove 102 to the control chamber 76, with which the movement of the first valve element 36 is controlled. From that section of the peripheral wall of the switching chamber 88, which lies approximately in the region of the constricted transition section 94 of the valve element 90, a channel 112 leads to an annular space 114 in the lower region of the second valve element 40.
  • the peripheral wall of the switching chamber 88 forms a valve seat 116 for a switching edge 118 of the valve element 90.
  • the switching edge 118 is formed between the switching section 92 and the transition section 94.
  • a further channel 120 extends obliquely to the longitudinal axis of the valve element 90. This comprises a flow restrictor 122 and connects the annular groove 102 to the control chamber 84.
  • a leakage channel 124 should also be mentioned, which extends from the recess 34 in Upper part 30 of the housing leads to a leakage connection 126.
  • the injector 22 shown in FIGS. 1 to 3 works as follows:
  • valve element 38 of the common valve device 56 rests on the upper valve seat 68 in FIG.
  • the switching chamber 60 of the common valve device 56 in the control chamber 76 of the first valve element 36, and in the control chamber 84 of the hydraulically actuated switching valve 86 is therefore on High pressure connection 106 present high pressure.
  • the valve element 92 of the hydraulically actuated switching valve 86 is printed with the switching edge 118 against the valve seat 116. That area of the switching chamber 88 which is at the level of the transition section 94 is therefore separated from the high-pressure connection 106. Therefore, it has a comparatively low pressure.
  • the second valve element 40 can therefore be pressed against the valve seat 42 by the spring 46.
  • valve element 36 is also pressed against the valve seat 38.
  • the injector 22 is thus closed and no fuel escapes from the openings 52 and 54.
  • the valve element 58 of the common valve device 56 can be brought by the actuator 64 via the tappet 62 into a second switching position, in which it rests on the lower boundary wall of the switching chamber 60 in FIG. 2.
  • the switching chamber 60 is now connected to the low pressure connection 72 via the channel 70.
  • the high pressure can thus escape from the control chamber 84 of the hydraulically advisable switching valve 86 via the flow restrictor 82.
  • the compression spring 98 is now
  • Valve element 90 of the hydraulically actuated switching valve 86 is moved in the direction of the control chamber 84, so that the switching edge 118 lifts off the valve seat 116.
  • the fuel present in the annular groove 102 under high pressure can now flow into the annular space 114 via the channel 112.
  • the high one is now located on a region radially outside the valve seat 42 of the lower conical end face of the valve element 40 in FIG
  • Fuel pressure that is also present at the high pressure connection 106 This moves the second valve element 40 upward against the action of the compression spring 46, so that it comes free from the valve seat 42.
  • the fuel present under high pressure in the annular space 114 can thus flow outward through the outlet openings 54.
  • control chamber 76 there is still a high fuel pressure in it, which presses the first valve element 36 downward over the pressure surface 78 in FIG.
  • a high fuel pressure is now applied to the region of the conical lower end surface of the valve element 36 located radially outside of the valve seat 38, the first valve element 36 is pressed further against the valve seat 38 due to the resultant downward force of the pressure surface 78 in FIG. No fuel can therefore continue to escape through the outlet openings 52.
  • the flow throttle 80 causes the fuel to flow out of the control chamber 76 delayed.
  • valve element 58 of the common valve device 56 can also be brought into a third, middle switching position by the actuator 64. In this it is neither on the valve seat 68 nor on the lower end wall of the switching chamber 60 in FIG. 2. Thus, as in the second switching position, the switching chamber 60 with the
  • Ventilele ent 36 is lifted from the valve seat 38 by the high pressure applied to the conical end face on the radially outside of the valve seat 38. If the valve element 58 of the common valve device 56 is thus in the middle third switching position, the
  • Injector 22 dispenses fuel both through the outlet openings 54 and through the outlet openings 52.

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

L'invention concerne un dispositif d'injection de carburant (22) destiné à un moteur à combustion interne, comportant un boîtier (30, 32). Ledit boîtier comporte une cavité (34) contenant deux éléments de soupape (36, 40) logés de façon coaxiale l'un par rapport à l'autre, interagissant respectivement avec un siège de soupape correspondant (38, 42). Des orifices de sortie de carburant (52, 54) sont affectés respectivement aux éléments de soupape (36, 40). L'invention vise à mettre en oeuvre un tel dispositif d'injection de carburant (22) de construction compacte. A cet effet, ledit dispositif comporte un système de soupape commun (56) présentant au moins trois positions de commutation et influençant la position des éléments de soupape (36, 40).
EP03740027A 2002-10-09 2003-05-23 Dispositif d'injection de carburant destine a un moteur a combustion interne Expired - Lifetime EP1552136B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10246973A DE10246973A1 (de) 2002-10-09 2002-10-09 Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
DE10246973 2002-10-09
PCT/DE2003/001677 WO2004033891A1 (fr) 2002-10-09 2003-05-23 Dispositif d'injection de carburant destine a un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1552136A1 true EP1552136A1 (fr) 2005-07-13
EP1552136B1 EP1552136B1 (fr) 2006-08-23

Family

ID=32038354

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03740027A Expired - Lifetime EP1552136B1 (fr) 2002-10-09 2003-05-23 Dispositif d'injection de carburant destine a un moteur a combustion interne

Country Status (5)

Country Link
US (1) US7267096B2 (fr)
EP (1) EP1552136B1 (fr)
CN (1) CN1688805A (fr)
DE (2) DE10246973A1 (fr)
WO (1) WO2004033891A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10335211A1 (de) * 2003-08-01 2005-02-17 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
DE102004002090A1 (de) * 2004-01-15 2005-08-04 Robert Bosch Gmbh Einspritzdüse und zugehöriges Betriebsverfahren
DE602006008377D1 (de) 2005-04-28 2009-09-24 Delphi Tech Inc Einspritzdüse
EP1717435B1 (fr) * 2005-04-28 2009-08-12 Delphi Technologies, Inc. Buse d'injection
DE602005009334D1 (de) * 2005-05-03 2008-10-09 Delphi Tech Inc Vorrichtung für ein Kraftstoffeinspritzventil mit schaltbaren Betriebsarten
DE102006020634B4 (de) * 2006-05-04 2008-12-04 Man Diesel Se Einspritzinjektor für Brennkraftmaschinen
JP4245639B2 (ja) * 2007-04-13 2009-03-25 トヨタ自動車株式会社 内燃機関の燃料噴射弁
US8905059B2 (en) 2012-07-20 2014-12-09 Caterpillar Inc. Diesel fuel leakage control system for a dual fuel injector
DE102013210036A1 (de) * 2013-05-29 2014-12-04 Robert Bosch Gmbh Hochdruckpumpe für ein Kraftstoffeinspritzsystem
WO2023166139A1 (fr) * 2022-03-03 2023-09-07 Ganser-Hydromag Ag Soupape d'injection de carburant pour moteurs à combustion interne
US11970977B2 (en) 2022-08-26 2024-04-30 Hamilton Sundstrand Corporation Variable restriction of a secondary circuit of a fuel injector
US20240068408A1 (en) * 2022-08-26 2024-02-29 Collins Engine Nozzles, Inc. Proportional force modification of passive spool for control of secondary nozzle circuits
US11970976B2 (en) 2022-08-26 2024-04-30 Hamilton Sundstrand Corporation Variable restriction of fuel nozzle with an auxiliary circuit
US11913382B1 (en) 2022-08-26 2024-02-27 Hamilton Sundstrand Corporation Variable restriction of a fuel circuit of a fuel nozzle
US11913381B1 (en) * 2022-08-26 2024-02-27 Hamilton Sundstrand Corporation Force modification of passive spool for control of secondary nozzle circuits

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60015218T2 (de) * 1999-04-01 2006-02-16 Delphi Technologies, Inc., Troy Brennstoffeinspritzventil
GB9916464D0 (en) * 1999-07-14 1999-09-15 Lucas Ind Plc Fuel injector
DE10058130A1 (de) 2000-11-22 2002-05-23 Bosch Gmbh Robert Kraftstoffeinspritzsystem für Brennkraftmaschinen
US20060060673A1 (en) * 2000-11-22 2006-03-23 Gerhard Mack Injector with separately controllable injector needles
DE10058153A1 (de) * 2000-11-22 2002-06-06 Bosch Gmbh Robert Einspritzdüse mit separat steuerbaren Düsennadeln
US6557776B2 (en) * 2001-07-19 2003-05-06 Cummins Inc. Fuel injector with injection rate control
US6705543B2 (en) * 2001-08-22 2004-03-16 Cummins Inc. Variable pressure fuel injection system with dual flow rate injector
US6725838B2 (en) * 2001-10-09 2004-04-27 Caterpillar Inc Fuel injector having dual mode capabilities and engine using same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004033891A1 *

Also Published As

Publication number Publication date
US7267096B2 (en) 2007-09-11
DE10246973A1 (de) 2004-04-22
US20060144964A1 (en) 2006-07-06
CN1688805A (zh) 2005-10-26
EP1552136B1 (fr) 2006-08-23
WO2004033891A1 (fr) 2004-04-22
DE50304778D1 (de) 2006-10-05

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