EP1387953A1 - Injecteur de carburant comprenant des obturateurs de commande montes en serie - Google Patents

Injecteur de carburant comprenant des obturateurs de commande montes en serie

Info

Publication number
EP1387953A1
EP1387953A1 EP02742697A EP02742697A EP1387953A1 EP 1387953 A1 EP1387953 A1 EP 1387953A1 EP 02742697 A EP02742697 A EP 02742697A EP 02742697 A EP02742697 A EP 02742697A EP 1387953 A1 EP1387953 A1 EP 1387953A1
Authority
EP
European Patent Office
Prior art keywords
valve
control valve
valve body
seat
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Withdrawn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
EP02742697A
Other languages
German (de)
English (en)
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 EP1387953A1 publication Critical patent/EP1387953A1/fr
Withdrawn legal-status Critical Current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
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M63/0045—Three-way valves
    • 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
    • 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
    • F02M63/0007—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 electrically actuated valves

Definitions

  • fuel injection systems are used, the fuel injectors of which are supplied with fuel via the interposition of high-pressure plenum chambers (common rail). Start of injection and injection quantity are set with the electrically controllable injector.
  • the fuel injectors are installed in the cylinder head without having to make any significant modifications to the cylinder head of the internal combustion engine. Depending on the intended use on passenger cars or commercial vehicles, the injectors used can influence the course of the injection.
  • EP 0 987 432 A2 relates to a fuel injector.
  • This includes a nozzle needle, which is pressed into its seat via a spring element. The end face of the nozzle needle is acted upon by the fuel pressure in a control chamber, in which fuel flows in via a supply line in which a throttle element is received.
  • a control chamber in which fuel flows in via a supply line in which a throttle element is received.
  • an outlet valve which controls the outlet of the fuel from the supply line into a low-pressure area, and a control valve which releases or closes the connection between the control chamber and the low-pressure area.
  • the drain valve and the control valve are operated via a common electromagnetic actuator.
  • the actuator is housed in a housing that encloses the drain valve and the control valve.
  • the control valve, the drain valve and the actuator are arranged so that in the deactivated state the drain valve and the control valve are in their respective open positions. If the actuator is moved into a first position, which corresponds to a first current level, the drain valve is closed while the control valve remains in its open position. On the other hand, if the electromagnetic actuator is energized further and reaches a second, higher current level, the control valve is also closed.
  • the injection is ended by deactivating the actuator, the drain valve initially opening. Since the control valve is still open shortly before the drain valve opens, the pressure can be exerted against the spring element of the nozzle needle Closing the nozzle works, be lowered so that faster needle closing can be achieved.
  • EP 0 994 248 A2 relates to a fuel injector with the shape of the injection course by a piezo actuator.
  • An injection opening is formed on the injector body of the fuel injector.
  • a nozzle needle is movably received in the injector body and can be moved back and forth between a release position of the injection opening and a closed position of the injection opening.
  • a piezoelectric actuator is accommodated in the injector body and can be moved between an active and inactive position.
  • the nozzle needle and the piezoelectric actuator are connected to one another by means of a coupling element in order to convert the movement of the piezoelectric actuator into a larger movement of the nozzle needle during its stroke in the injector body.
  • a combination of a pressure-controlled, partially pressure-balanced control valve with a positively controlled, stroke-controlled control valve can be represented.
  • the pressure-controlled, partially pressure-balanced control valve which is preferably designed as a 3/2-way control valve, can be directly controlled. Direct control of the 3/2-way valve allows its stepped adjustment.
  • the coupling between the pressure-controlled 3/2-way control valve and the force-controlled, stroke-controlled control valve arranged downstream of it is carried out by a rod-shaped transmission element. This can be enclosed by a cup-shaped recess in the 3/2 way control valve.
  • An idle stroke can be set between the contact surface of the transmission element and the contact surface of the 3/2-way control valve body. By means of this idle stroke, the opening and closing times of the 2/2-way valve relieving the control chamber pressure can be set such that the nozzle chamber surrounding the nozzle needle is already acted upon by the partially open 3/2-way control valve with fuel under high pressure ,
  • pressure relief of a control chamber acting on the nozzle needle can be achieved in terms of time and after the nozzle chamber surrounding the nozzle needle is acted on.
  • the 3/2-way control valve which is preferably designed as a seat / slide valve, partial closing allows the downstream 3/2-way control valve to be closed; As long as the 3/2-way control valve is moved out of its seat in the injector housing and the slide part formed on it is still closed, the fuel injector acts as a stroke-controlled injector.
  • the 3/2-way control valve is fully closed in its seat, there is a pressure relief of the nozzle inlet and thus the nozzle area of the nozzle needle in the drain oil drain.
  • the nozzle needle closes by building up pressure in the control room via the inlet bore with inlet throttle, which branches off from the nozzle inlet.
  • Figure 1 A series connection of a 3/2-way control valve and one
  • FIG. 2 shows a booster piston arrangement accommodated above the 3/2 control valve.
  • FIG. 1 shows the connection in series of a 3/2-way control valve and a 2/2-way control valve above a control chamber acting on the nozzle needle.
  • a housing bore 8 is formed in the injector body 2 of an injector 1 for injecting fuel into the combustion chamber of an internal combustion engine.
  • the upper end face of the valve body 7 projects into a transmission chamber 5.
  • the end face of a booster piston 3 opposite the end face of the valve body 7 projects into this translator chamber 5 and can be actuated via an actuator 40 (not shown in FIG. 1).
  • the actuator 40 can also act directly on the end face of the valve body 7 of the first 3/2-way control valve 6 facing it.
  • a constriction 10 is formed on the valve body 7, in the area of which in the injector body 2 an inlet 9 opens at a high-pressure collecting space (common rail), not shown here.
  • the constriction 10 on the valve body 7 tapers in the direction of the valve chamber 13.
  • a seat diameter ser 11 executed, which forms the seat of the valve body 7 with a first seat surface 12 of the injector body 2.
  • valve body 7 of the first 3/2-way control valve 6 is enclosed by a valve chamber 13 in the injector body 2, which is connected to a nozzle inlet 15 via a branch 14.
  • the nozzle inlet 15 in turn opens into a nozzle space, not shown in FIG. 1, which encloses a nozzle needle, also not shown, in the lower region of the injector body 2.
  • An inlet 16 branches off from the nozzle inlet 15 to a control chamber 37.
  • An inlet throttle 17 is accommodated in the inlet 16 to the control chamber 37.
  • the overlap of the slide edge of the slide part 18 of the valve body 7 is designated by reference number 19 (h 2 ).
  • a pot-shaped cavity 23 is formed in the lower region of the valve body 7 and has a contact surface 24 on its side facing a bolt-shaped transmission element 26.
  • the valve body 7 comprises at its lower end an annularly configured end face 20, against which a restoring element designed as a spiral spring 21 rests.
  • the restoring element 21 is accommodated in a cavity in the injector body 2, from which a leak oil drain 22 branches off as well as bores 31.
  • the further control valve 29 is preferably designed as a 2/2-way control valve.
  • the valve member 30 of the further control valve 29 is in its closed position on a seat 32 of the injector body 2.
  • a further seat can optionally be provided in the injector body 2 for the, for example, spherical valve member 30 of the further control valve 29.
  • the control chamber 37 above a push rod 38 which acts on the nozzle needle (not shown here), is relieved of pressure, so that when the control chamber 37 is relieved of pressure, the control volume received in the latter via the outlet throttle 36 and the bores 31 flows out into the leak oil drain 22 above the seat surface 32 in the injector body 2.
  • the valve body 7 of the first control valve 6 is in the closed position, ie the seat diameter 11 of the valve body 7 lies against the seat 12 of the injector body 2.
  • a gap dimension 25 (hj) is established between the contact surface 24 and the upper end face 27 of the bolt-shaped transmission element 26.
  • the valve member 30 of the further control valve 29 also bears against its seat 32 in the injector body 2.
  • the nozzle inlet 14 is connected to the leakage oil outlet 22 via the valve chamber 13 through the opened slide part 18 of the valve body 7, so that the fuel from the nozzle chamber the nozzle inlet, the branch 14 and the valve chamber 13 can run off.
  • this operating position of the first control valve 6 there is a gap 25 between the contact surface 24 and the end face 27 of the transmission element 26 configured in the form of a bolt.
  • the injector 1 acts as a pressure-controlled injector for injecting fuel into the combustion chamber of a combustion engine.
  • valve body 7 of the first control valve 6 moves downward, so that fuel under high pressure is fed from the inlet 9 from the high-pressure accumulation chamber (common rail), not shown here shoots into the valve chamber 13 in the injector body 2 of the injector 1.
  • the fuel flows via the branch 14 into the nozzle inlet 15 and acts on the nozzle chamber, which is not shown here, and which surrounds the nozzle needle with fuel which is under high pressure.
  • the slide part 18 closes the connection of the valve chamber 13 to the leakage oil drain 22.
  • valve member 30 of the further control element 29 After overcoming the idle stroke 25 between the valve body 7 and the upper end face 27 of the bolt-shaped transmission element 26, the valve member 30 of the further control element 29 forcibly opens.
  • the control volume in the pressure-releasable control chamber 27 flows via the outlet throttle 36 into the cavity in which the valve member 30 of the further control valve 29, preferably configured as a 2/2-way control valve, is included.
  • the control volume flows through the bores 31 into the cavity of the injector body 2, in which the spring element 21 is received. From there, the control volume flows out via the leak oil drain 22.
  • the pressure relief of the control chamber 37 causes the push rod 38 projecting into the control chamber 37 to be extended, so that the nozzle needle connected to the push rod 38 projects into the combustion chamber of the internal combustion engine. releases and the fuel volume present in the nozzle chamber via the nozzle inlet 15 can be injected into the combustion chamber of the internal combustion engine.
  • the valve body 7 of the first control valve 6 can be adjusted in stages by means of the actuator (not shown in FIG. 1).
  • the valve member 30 of the further control valve 29 will also move into its seat 32 when the valve body 7 is partially closed in the direction of its seat 12 in the injector body 2.
  • the pressure relief of the control chamber 37 is terminated by the outlet throttle 36 and the pressure in the control chamber 37 is built up by the fuel volume entering the inlet 16 with the inlet throttle 17 via the nozzle inlet 15.
  • the push rod 38 moves downwards in the vertical direction and thus causes the injection openings to close by inserting a cone of the nozzle needle into its seat.
  • the injector 1 acts as a stroke-controlled injector.
  • valve body 7 Only when the actuator 40 is actuated further (see illustration according to FIG. 2) does the valve body 7 move vertically upward in the housing bore 8 into its seat 12. This overlaps the slide part 18 with the associated control edge on the injector body 2. so that a pressure relief of the nozzle inlet 14 can take place via the branch 14, the valve chamber 13 in the leak oil drain 22.
  • the gap dimension 25 is established between the contact surface 24 on the injector body 7 and the upper end face 27 of the transmission element 26 configured as a bolt.
  • the further control valve 29 is also closed, i. H. the, for example, spherically configured valve member 30 is placed on its seat 32 in the injector body. Due to the pressure build-up generated in the control chamber 37 in the injector body 2, the nozzle needle, which is connected to the push rod 38, is positively closed.
  • the point in time at which the further control valve connected downstream of the valve body 7 in the housing bore 8 can be determined.
  • til 29 opens, ie when the control room 37 is pressurized. This can be achieved that in the valve body 13 partially open Ventilkö ⁇ er 7 at its seat 12 in the injector housing 2 from the high-pressure collection chamber via the inlet 9, the branch 14 and the nozzle inlet 15 fuel flowing in the nozzle chamber, so that immediately after overcoming the gap dimension 25 one Ascending movement of the push rod 38 can take place in the control chamber 37.
  • An opening movement of the nozzle needle therefore takes place immediately after the gap 25 has been overcome, so that the fuel volume already present in the nozzle chamber can be injected into the combustion chamber of an internal combustion engine without delay.
  • the injector acts as a stroke-controlled injector. If, however, the first control valve 6 on the seat 12 is closed, i. H. the inlet 9 is blocked by the high-pressure collection chamber, the injector is relieved of pressure via the nozzle inlet 15
  • Branch 14 and the valve chamber 13 in the leak oil drain 22 are connected to the first control valve 6, i. H. whose Ventilkö ⁇ er 7 in a fully open state; the one about the
  • Inlet 9 pending fuel flows through the nozzle inlet 15 to the nozzle, with the overlap on the slide part 18 with the associated housing control edge acting simultaneously and the 2/2-way valve, i.e. H. the further control valve 29 opens via the positive control by the transmission element 26 configured in the form of a bolt.
  • the injector 1 acts as a pressure-controlled injector.
  • a stroke- and pressure-controlled injector can be achieved by means of a first control valve 6 designed as a 3/2-way control valve and a 2/2-way valve positively controlled by it. H. combine another control valve 29.
  • FIG. 2 shows a transmission piston arrangement which is accommodated above a 3/2-way control valve.
  • a piezo actuator 40 is accommodated, which acts on a plate-shaped element 43 accommodated in the valve body 2.
  • the plate-shaped element 43 is in turn supported on a Fede ⁇ aket 42 and is received on a further translation piston 4.
  • the end face of the further booster piston opposite the plate element 43 projects into a further booster chamber 41 in the injector body 2.
  • An upper end face of the first booster piston 3 also projects into this, which in turn has the upper end face of the valve body 7 of the first, preferably as, via a booster chamber 5 3/2-way control valve configured to control first control valve 6.
  • a pressure translation designed as a translation piston 3 or 4
  • there is also a mechanical translation of the actuator movement to bring about a sufficient upward and downward movement of the valve body 7, which positively controls the valve member 30 of the further control valve 29 via the bolt-shaped transmission element 26.
  • Transmission element upper end surface lower end surface further control valve (2/2)

Landscapes

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

Abstract

L'invention concerne un injecteur de carburant servant à injecter du carburant dans la chambre de combustion d'un moteur à combustion. Cet injecteur comprend un corps (2) comportant une cavité (8) dans laquelle est logée une première soupape de commande 3/2 (6), le corps (7) de cette soupape comportant une section coulissante (18) et présentant un diamètre de siège (11). Le corps (7) de la soupape de commande 3/2 (6) est actionné par un actionneur (40) directement ou indirectement par l'intermédiaire d'éléments de translation (3, 4). Un obturateur (30) d'une autre soupape de commande (29) est commandé de manière forcée au moyen du corps (7) de la soupape de commande 3/2 (6) par l'intermédiaire d'un élément de transmission (26). Lorsque le corps (7) de soupape se trouve dans une première position à l'intérieur de la cavité (8), l'élément de transmission (26) est situé à une distance h1 (25) dudit corps (7).
EP02742697A 2001-05-08 2002-04-26 Injecteur de carburant comprenant des obturateurs de commande montes en serie Withdrawn EP1387953A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10122246 2001-05-08
DE10122246A DE10122246A1 (de) 2001-05-08 2001-05-08 Injektor zum Einspritzen von Kraftstoff mit in Reihe geschalteten Steuerventilgliedern
PCT/DE2002/001542 WO2002090765A1 (fr) 2001-05-08 2002-04-26 Injecteur de carburant comprenant des obturateurs de commande montes en serie

Publications (1)

Publication Number Publication Date
EP1387953A1 true EP1387953A1 (fr) 2004-02-11

Family

ID=7683971

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02742697A Withdrawn EP1387953A1 (fr) 2001-05-08 2002-04-26 Injecteur de carburant comprenant des obturateurs de commande montes en serie

Country Status (5)

Country Link
US (1) US20040026537A1 (fr)
EP (1) EP1387953A1 (fr)
JP (1) JP2004519607A (fr)
DE (1) DE10122246A1 (fr)
WO (1) WO2002090765A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004046899A1 (de) * 2004-09-28 2006-03-30 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
US20160235709A1 (en) 2012-08-31 2016-08-18 Molecular product management LLC Limited release lingual thioctic acid delivery systems
DE102012204252B3 (de) * 2012-03-19 2013-08-29 Continental Automotive Gmbh Verfahren zum Betreiben eines Kraftstoffeinspritzsystems mit Druckabbau und Kraftstoffeinspritzsystem mit Einspritzventil mit Servoventil

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
AT1626U1 (de) * 1995-04-05 1997-08-25 Avl Verbrennungskraft Messtech Speichereinspritzsystem für brennkraftmaschinen
GB9616521D0 (en) * 1996-08-06 1996-09-25 Lucas Ind Plc Injector
DE19701879A1 (de) * 1997-01-21 1998-07-23 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
DE29717649U1 (de) * 1997-10-02 1997-11-20 FEV Motorentechnik GmbH & Co. KG, 52078 Aachen Direktgesteuertes Einspritzventil, insbesondere Kraftstoffeinspritzventil
US6199533B1 (en) * 1999-02-01 2001-03-13 Cummins Engine Company, Inc. Pilot valve controlled three-way fuel injection control valve assembly
US6336598B1 (en) * 1998-09-16 2002-01-08 Westport Research Inc. Gaseous and liquid fuel injector with a two way hydraulic fluid control valve
GB9820239D0 (en) * 1998-09-18 1998-11-11 Lucas Ind Plc Fuel injector
US6079641A (en) * 1998-10-13 2000-06-27 Caterpillar Inc. Fuel injector with rate shaping control through piezoelectric nozzle lift
DE19860397A1 (de) * 1998-12-28 2000-06-29 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
GB9905896D0 (en) * 1999-03-16 1999-05-05 Lucas Ind Plc Fuel injector arrangement
DE19939448A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Injektor
DE19939418A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Kraftstoffeinspritzsystem für eine Brennkraftmaschine
GB9919785D0 (en) * 1999-08-21 1999-10-27 Lucas Industries Ltd Fuel injector arrangement

Non-Patent Citations (1)

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Title
See references of WO02090765A1 *

Also Published As

Publication number Publication date
US20040026537A1 (en) 2004-02-12
WO2002090765A1 (fr) 2002-11-14
DE10122246A1 (de) 2002-11-21
JP2004519607A (ja) 2004-07-02

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