EP1286043A2 - Injecteur de type accumulateur pour système d'injection de carburant - Google Patents

Injecteur de type accumulateur pour système d'injection de carburant Download PDF

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Publication number
EP1286043A2
EP1286043A2 EP02016523A EP02016523A EP1286043A2 EP 1286043 A2 EP1286043 A2 EP 1286043A2 EP 02016523 A EP02016523 A EP 02016523A EP 02016523 A EP02016523 A EP 02016523A EP 1286043 A2 EP1286043 A2 EP 1286043A2
Authority
EP
European Patent Office
Prior art keywords
nozzle needle
control chamber
injector according
control
valve member
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Withdrawn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
EP02016523A
Other languages
German (de)
English (en)
Other versions
EP1286043A3 (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 EP1286043A2 publication Critical patent/EP1286043A2/fr
Publication of EP1286043A3 publication Critical patent/EP1286043A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements

Definitions

  • the invention relates to an injector for a Fuel injection system for internal combustion engines with one Housing, with a nozzle needle, with a control room, with one limited by a pressure shoulder of the nozzle needle Pressure chamber, the control chamber at least indirectly from the nozzle needle is limited, the control room hydraulically via an inlet throttle with a Fuel inlet is connected and where the Control room hydraulically via a control valve an outlet throttle can be connected to a fuel return is.
  • the invention has for its object an injector for a fuel injection system for internal combustion engines to further improve in terms of injection behavior.
  • a Injector for a fuel injection system for Internal combustion engines with a housing, with a Nozzle needle, with a control room, with one of one Pressure shoulder of the nozzle needle limited control room, being the control room at least indirectly from the nozzle needle is limited, with the control room hydraulically via a Inlet throttle in connection with a fuel inlet stands, and being the control chamber of a control valve hydraulically via a flow restrictor with a Fuel return is connectable, solved in that a 3/2-way valve is available with a valve member that the 3/2-way valve in a first switch position the pressure chamber and the fuel return hydraulically with each other connects that the 3/2-way valve in a second Switch position the pressure chamber and the fuel supply hydraulically connects with each other, and that the 3/2-way valve depending on the pressure difference between Fuel inlet and control room the first or second Takes up switching position.
  • the nozzle needle opens pressure controlled and is forcibly closed when the Pressure in the control room due to the closing of the Control valve increases.
  • the Control room is formed in two parts that a first part of the control room is formed in the nozzle needle that a second part of the control chamber formed in the valve member is that the first part of the control room by a first Paragraph in the housing can be limited and that the second part of the Control room limited by a second paragraph in the housing becomes.
  • the control room volume can be very high be kept low, since the first part and the second part of the Control room not at the same time, but in relation to each other can be controlled offset. This results in a further improvement of the opening and in particular the Closing behavior of the injector according to the invention.
  • Another aspect of the invention provides that the second part of the control room with an inlet throttle the fuel supply is hydraulically connected, and / or that the first part and the second part of the Control room via a flow restrictor with the Fuel return can be connected, and / or that the first Part and the second part of the control room hydraulic communicate with each other.
  • the 3/2-way valve has a valve member that the Control space limited by an end face of the valve member is that the fuel supply through a on the housing trained and with a sealing cone of the valve member cooperating sealing seat from the pressure chamber and / or the Leak return is separable, and that the diameter of the Sealing seat smaller than the diameter of the end face of the Valve member is.
  • the 3/2-way valve with at least a sealing seat can be guaranteed that Fuel inlet and pressure chamber leak-free from each other can be separated.
  • the valve member because of the difference in the diameter of the sealing seat and End face of the valve member in a simple manner Dependence of the pressure difference between the fuel supply and control room can be opened.
  • a push rod between the control room and the nozzle needle is provided and that the control room from a first Front of the push rod is limited, and that a second end face of the push rod on one end face of the Nozzle needle rests.
  • the first part of the control room can be in one Push rod can be arranged.
  • a nozzle spring which presses the nozzle needle towards a nozzle needle seat, so the injector is closed when there is no pressure in the There is a fuel supply.
  • a closing spring presses the valve member in the direction of the sealing seat so that the 3/2-way valve also has a defined position, when the injector is depressurized.
  • control valve can be from an electromagnet or a piezo actuator.
  • FIG. 1 a first embodiment of an injector according to the invention is shown schematically.
  • the injector has a housing 1, in which a stepped bore 3 is made.
  • a nozzle needle 5 and a push rod 7 are guided in the stepped bore 3.
  • the stepped bore 3 ends on the combustion chamber side in a nozzle needle seat 9.
  • the nozzle needle seat 9 has a first diameter d 1 .
  • the nozzle needle 5 is guided in a section of the stepped bore 3 with a second diameter d 2 .
  • the push rod 7 is guided in a section of the stepped bore 3 with a third diameter d 3 .
  • a nozzle spring chamber 11 is recessed, in which a nozzle spring 13 is provided, which is supported at one end against the housing 1 and at the other end against a shoulder of the push rod 7.
  • the nozzle spring 13 ensures that the nozzle needle 5 is pressed into the nozzle needle seat 9 when the injector is depressurized.
  • the control room 17 is a Fuel inlet 19, which with a not shown Common rail is connected, and an inlet throttle 21st pressurized with high pressure fuel. Via a control valve 23, the control chamber 17 can with a Fuel return 25 are connected.
  • the control valve 23 is in the first embodiment with a ball valve an actuator 27 formed by one not shown actuator, in particular a solenoid valve or a piezo actuator. Alternatively, you can other control valves are used.
  • the control chamber 17 is also delimited by a valve member 29 of a 3/2-way valve 31.
  • the 3/2-way valve 31 is designed as a seat / slide valve.
  • the fuel inlet 19 is hydraulically separated from a pressure chamber 37 and the leakage oil return 25 by a sealing seat 33 of the housing 1, which cooperates with a corresponding sealing cone 35 of the valve member 29.
  • the diameter of the sealing seat 33 is designated in Fig. 1 as the fourth diameter d 4 . It is important that the fourth diameter d 4 is smaller than the diameter of the valve member 29 with which it delimits the control chamber 17.
  • the 3/2-way valve 31 is connected via a connecting bore 39 to the pressure chamber 37 at the end of the nozzle needle 5 on the combustion chamber side.
  • Flow restrictor 26 is provided between control room 17 and control valve 23 .
  • a control edge 41 in the Housing 1 formed together with that in this Area designed as a control piston valve member 29 a hydraulic separation between pressure chamber and Fuel inlet 19 on the one hand and fuel inlet 25 on the other hand.
  • This switch position is in Connection with the invention as a second switching position designated.
  • flats 45 in the valve member 29 attached that evenly over the circumference of the Valve member 29 are distributed.
  • valve member 21 leaves the first switching position shown in FIG. 1 and moves in the direction of the control chamber 17. This movement is triggered by a hydraulic force which acts on the annular surface which delimits is triggered by the fourth diameter d 4 and the diameter of the valve member 29 in the control chamber 17, or the high pressure of the fuel from the fuel inlet 19 acting on this surface.
  • valve piston of the valve member 29 begins Cover control edge 41. That is the connection between pressure chamber 37 and fuel return 25 interrupted.
  • the injector according to the invention closes when that Control valve 23 is closed and thus the pressure in Control room 17 rises again. Once the on the End face 15 of the push rod 7 acting hydraulic Force is greater than that on the pressure shoulder 47 Hydraulic force acting on the nozzle needle closes the Nozzle needle 5 again and the injection is ended. The Nozzle needle 5 thus closes under positive control. This will a quick closing of the nozzle needle in all Operating points ensured. Also the possibility of one Post-injection is due to the forced closing described the nozzle needle 5 possible.
  • the control space is divided into a first part 17a and a second part 17b.
  • the first part 17a is formed in the nozzle needle 5 and is delimited by a first shoulder 49 of the housing 1.
  • the first paragraph has a third diameter d 3 , which corresponds in function to the third diameter d 3 of the push rod 7 from the embodiment of FIG. 1.
  • the first part 17a of the control chamber can be connected to the fuel return 25 via a first outlet throttle 26a via the control valve 23 and a feed line 51.
  • a second part 17b of the control chamber is in the valve member 29 formed by a second shoulder 53 of the housing 1st is limited. Via a second outlet throttle 26b second part 17b of the control room also with the supply line 51 connected.
  • the fuel inlet 19 supplies over an inlet throttle 21 the second part 17b of the control room with high pressure fuel. About the second Drain throttle 26b and the first drain throttle 26a will also the first part 17a of the control chamber is supplied with fuel.
  • a closing spring chamber 55 is located in the housing 1 of the injector formed in which a closing spring 57 is present.
  • the Closing spring 57 ensures that the valve member 29 in the 2 is brought into the first switching position, when the injector is depressurized.
  • In the first Switch position are the pressure chamber 37 via flats 59 on the nozzle needle 5, the nozzle spring chamber 11 and the Connection bore 39 with the fuel return 25 in Connection.
  • the connection between pressure chamber 37 and Fuel return 25 on the one hand and the fuel supply 19 is in the first switching position through the sealing seat 33 interrupted.
  • FIG. 3 shows the timing of an injection process shown in diagram form.
  • the Pressure P plotted against time t.
  • a first line 63 represents the time course of the pressure in the control room 17th
  • a second line 65 represents the pressure in the pressure space 37 represents. This pressure also acts on the pressure shoulder 47 of the Nozzle needle 5.
  • the stroke 67 of the Control valve 23 plotted against time.
  • the stroke 69 of the Nozzle needle 5 applied over time. From this Presentation and synopsis of the three with each other Diagrams arranged horizontally can be clearly seen that the nozzle needle opens under pressure control and the Adjustment movement of the valve member 29 and the opening of the Nozzle needle 5 does not take place simultaneously.

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  • 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)
EP02016523A 2001-08-23 2002-07-24 Injecteur de type accumulateur pour système d'injection de carburant Withdrawn EP1286043A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10141221A DE10141221B4 (de) 2001-08-23 2001-08-23 Druck-Hub-gesteuerter Injektor für Kraftstoffeinspritzsysteme
DE10141221 2001-08-23

Publications (2)

Publication Number Publication Date
EP1286043A2 true EP1286043A2 (fr) 2003-02-26
EP1286043A3 EP1286043A3 (fr) 2004-05-12

Family

ID=7696294

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02016523A Withdrawn EP1286043A3 (fr) 2001-08-23 2002-07-24 Injecteur de type accumulateur pour système d'injection de carburant

Country Status (4)

Country Link
US (1) US6837450B2 (fr)
EP (1) EP1286043A3 (fr)
JP (1) JP2003120458A (fr)
DE (1) DE10141221B4 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007027331A1 (fr) * 2005-08-29 2007-03-08 Caterpillar Inc. Injecteur de liquide unique avec capacité de mise en forme de débit
CN103670851A (zh) * 2013-11-28 2014-03-26 上海交通大学 适用于二甲醚燃料的双高压油管喷油器

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7278593B2 (en) * 2002-09-25 2007-10-09 Caterpillar Inc. Common rail fuel injector
DE10254749A1 (de) * 2002-11-23 2004-06-17 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung mit einem 3/3-Wege-Steuerventil zur Einspritzverlaufsformung
JP4019934B2 (ja) * 2002-12-26 2007-12-12 株式会社デンソー 制御弁および燃料噴射弁
JP4428357B2 (ja) * 2006-04-03 2010-03-10 株式会社デンソー 燃料噴射弁
US9856841B2 (en) * 2014-05-30 2018-01-02 Avl Powertrain Engineering, Inc. Fuel injector

Family Cites Families (17)

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Publication number Priority date Publication date Assignee Title
DD102772A1 (fr) * 1973-01-08 1973-12-20
US4080942A (en) * 1976-06-23 1978-03-28 The United States Of America As Represented By The Secretary Of The Army Metering fuel by compressibility
US4129254A (en) * 1977-09-12 1978-12-12 General Motors Corporation Electromagnetic unit fuel injector
US4503825A (en) * 1982-04-02 1985-03-12 Bendix Corporation Diesel fuel system
DE19706469A1 (de) * 1997-02-19 1998-08-27 Daimler Benz Ag Speichereinspritzsystem für eine mehrzylindrige Brennkraftmaschine mit magnetventilgesteuerten Kraftstoffeinspritzventilen
DE29717649U1 (de) * 1997-10-02 1997-11-20 FEV Motorentechnik GmbH & Co. KG, 52078 Aachen Direktgesteuertes Einspritzventil, insbesondere Kraftstoffeinspritzventil
US5884611A (en) * 1997-10-14 1999-03-23 Cummins Engine Company, Inc. Effervescent injector for diesel engines
JPH11280588A (ja) * 1998-03-31 1999-10-12 Denso Corp 燃料噴射ノズル
US6109542A (en) * 1998-09-21 2000-08-29 Cummins Engine Company, Inc. Servo-controlled fuel injector with leakage limiting device
JP2001140726A (ja) * 1998-12-09 2001-05-22 Denso Corp 弁装置およびそれを用いた燃料噴射装置
GB9905896D0 (en) * 1999-03-16 1999-05-05 Lucas Ind Plc Fuel injector arrangement
DE19923421C2 (de) * 1999-05-21 2003-03-27 Bosch Gmbh Robert Injektor
DE19963367B4 (de) * 1999-12-28 2008-07-31 Robert Bosch Gmbh Common-Rail-Injektor
DE10031582A1 (de) * 2000-06-29 2002-01-17 Bosch Gmbh Robert Druckgesteuerter Injektor mit gesteuerter Düsennadel
DE10053903A1 (de) * 2000-10-31 2002-05-29 Bosch Gmbh Robert Hub-/ und Druckgesteuerter Injektor mit Doppelschieber
DE10056165C2 (de) * 2000-11-13 2003-06-12 Bosch Gmbh Robert Sammelraumbeaufschlagter Injektor mit kaskadenförmiger Steuerungsanordnung
GB0105193D0 (en) * 2001-03-02 2001-04-18 Delphi Tech Inc Fuel system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007027331A1 (fr) * 2005-08-29 2007-03-08 Caterpillar Inc. Injecteur de liquide unique avec capacité de mise en forme de débit
CN103670851A (zh) * 2013-11-28 2014-03-26 上海交通大学 适用于二甲醚燃料的双高压油管喷油器
CN103670851B (zh) * 2013-11-28 2015-10-28 上海交通大学 适用于二甲醚燃料的双高压油管喷油器

Also Published As

Publication number Publication date
US20030052187A1 (en) 2003-03-20
EP1286043A3 (fr) 2004-05-12
US6837450B2 (en) 2005-01-04
JP2003120458A (ja) 2003-04-23
DE10141221B4 (de) 2009-07-30
DE10141221A1 (de) 2003-03-20

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