EP1476655A1 - Systeme d'injection de carburant pour un moteur a combustion interne - Google Patents

Systeme d'injection de carburant pour un moteur a combustion interne

Info

Publication number
EP1476655A1
EP1476655A1 EP02792635A EP02792635A EP1476655A1 EP 1476655 A1 EP1476655 A1 EP 1476655A1 EP 02792635 A EP02792635 A EP 02792635A EP 02792635 A EP02792635 A EP 02792635A EP 1476655 A1 EP1476655 A1 EP 1476655A1
Authority
EP
European Patent Office
Prior art keywords
control
pressure chamber
chamber
pressure
pump
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
EP02792635A
Other languages
German (de)
English (en)
Other versions
EP1476655B1 (fr
Inventor
Peter Boehland
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 EP1476655A1 publication Critical patent/EP1476655A1/fr
Application granted granted Critical
Publication of EP1476655B1 publication Critical patent/EP1476655B1/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
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps

Definitions

  • the invention is based on one
  • Control pressure chamber prevailing pressure acts in a closing direction on the injection valve member and is movable together with the injection valve member.
  • the Control pressure chamber has a connection to the pump work chamber.
  • the first control valve is closed and the second control valve is opened, so that no high pressure can build up in the control pressure chamber and the fuel injection valve can open.
  • the second control valve is open, however, fuel flows out of the pump work chamber via the control pressure chamber, so that the quantity of fuel available for injection is reduced from the quantity of fuel delivered by the pump piston, and the pressure available for injection is also reduced. It follows from this that the efficiency of the fuel injection device is not optimal.
  • the embodiment according to claim 3 enables the arrangement of the further printing surface in a simple manner.
  • the embodiment according to claims 4 and 5 enables a simple construction of the fuel injection device.
  • FIG. 3 shows detail II of the fuel injection device according to a further modified embodiment
  • FIG. 4 shows a course of a pressure at injection openings of a fuel injection valve of the fuel injection device.
  • a channel 60 leads from the pump work chamber 22 through the pump body 14 and the valve body 26 to the pressure chamber 40 of the fuel injection valve 12.
  • a channel 62 leads from the pump work chamber 22 or from the channel 60 to the control pressure chamber 52.
  • a channel 64 also opens into the control pressure chamber 52, which connects to form a relief space than that at least indirectly can serve the fuel reservoir 24 or another area in which a low pressure prevails.
  • a connection 66 leads from the pump work chamber 22 or from the channel 60 to a relief chamber 24, which is controlled by a first electrically operated control valve 68.
  • the control valve 68 can be as shown in Figure 1 be designed as a 2/2-way valve.
  • the connection 64 of the control pressure chamber 52 to the relief chamber 24 is controlled by a second electrically operated control valve 70, which can be designed as a 2/2-way valve.
  • a throttle point 63 is provided and a throttle point 65 is provided in the connection of the control pressure chamber 52 with the relief chamber 24.
  • the inflow of fuel from the pump work chamber 22 into the control pressure chamber 52 and the outflow of fuel from the control pressure chamber 52 can be adjusted to a required extent by suitable dimensioning of the throttle points 63, 65.
  • a sufficient inflow of fuel into the control pressure chamber 52 is required for a quick closing of the fuel injection valve 12 and a sufficient outflow of fuel from the control pressure chamber 52 is required for a quick opening of the fuel injection valve 12.
  • the control valves 68, 70 can have an electromagnetic actuator or a piezo actuator and are controlled by an electronic control device 72.
  • the total closing force acting on the injection valve member 28 is therefore dependent on the force of the closing spring 44, on the pressure prevailing in the control pressure chamber 52, which is controlled by the second control valve 70, and on the pressure prevailing in the further pressure chamber 54, which is the same like the pressure prevailing in the pump working chamber 22, which in turn is dependent on the delivery stroke of the pump piston 18.
  • a connection 162 for example in the form of a bore, is formed in the control piston region 250, through which the control pressure chamber 52 is connected to the further pressure chamber 54.
  • a throttle point 163 is provided in the connection 162, which can be formed by the connection 162 itself if it is designed with a correspondingly small cross section.
  • the connection 64 leads from the control pressure chamber 52 to the relief chamber 24, which is controlled by the second control valve 70 and in which the throttle point 65 is provided.
  • the bore section 148 has the same diameter as the spring chamber 46.
  • an intermediate disk 58 is provided, on which the closing spring 44 is supported in the spring chamber 46.
  • a shim 59 can be arranged, with which the distance between the control piston 50 and the injection valve member 28 can be adjusted.
  • Control valve 70 flows a small amount of fuel via the throttling points 63, 65 to the relief chamber 24, however, the throttling points 63, 65 can be designed with a small flow cross-section, so that the outflowing fuel amount and the reduction in pressure in the pump work chamber 22 are small.
  • the first control valve 68 is brought into its open switching position by the control device 72, so that the pump working chamber 22 is connected to the relief chamber 24 and only a small compressive force acts on the injection valve member 28 in the opening direction 29 and the fuel injection valve 12 is caused by the force of the closing spring 44, which closes on the control piston 50 due to the residual pressure prevailing in the control pressure chamber 52 and the force generated on the pressure surface 53 in the further pressure chamber 54.
  • the second control valve 70 may be in its open or closed position to complete the main injection.

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 système d'injection de carburant qui comprend, pour chaque cylindre du moteur à combustion interne, une pompe haute pression d'alimentation en carburant (10) et une soupape d'injection de carburant (12) reliée à cette pompe. Un piston de pompe (18) de la pompe haute pression d'alimentation en carburant (10) délimite un espace de travail de pompe (22) qui est raccordé à une chambre de pression (40) de la soupape d'injection de carburant (12). La soupape d'injection de carburant comprend un élément de soupape d'injection (28) servant à commander des ouvertures d'injection (32) et pouvant être déplacé, par la pression régnant dans la chambre de pression (40), contre une force de fermeture dans un sens d'ouverture (29). Une première soupape de commande (68) commande une liaison (66) entre l'espace de travail de pompe (22) et une chambre de décharge (24) et une deuxième soupape de commande (70) commande une liaison (64) entre une chambre de pression de commande (52) reliée à l'espace de travail de pompe (22) et une chambre de décharge (24). Un point d'étranglement (63, 65) est placé respectivement dans des liaisons (62, 64) de la chambre de pression de commande (52) à l'espace de travail de pompe (22) et à la chambre de décharge (24). Une autre chambre de pression (54) est reliée à l'espace de travail de pompe (22) et est limitée par une surface de pression (53) par l'intermédiaire de laquelle est générée une autre force sur l'élément de soupape d'injection (28) dans le sens de fermeture.
EP02792635A 2002-02-12 2002-12-06 Systeme d'injection de carburant pour un moteur a combustion interne Expired - Lifetime EP1476655B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10205750A DE10205750A1 (de) 2002-02-12 2002-02-12 Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10205750 2002-02-12
PCT/DE2002/004480 WO2003069154A1 (fr) 2002-02-12 2002-12-06 Systeme d'injection de carburant pour un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1476655A1 true EP1476655A1 (fr) 2004-11-17
EP1476655B1 EP1476655B1 (fr) 2005-06-15

Family

ID=27618562

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02792635A Expired - Lifetime EP1476655B1 (fr) 2002-02-12 2002-12-06 Systeme d'injection de carburant pour un moteur a combustion interne

Country Status (5)

Country Link
US (1) US7025284B2 (fr)
EP (1) EP1476655B1 (fr)
JP (1) JP2005517859A (fr)
DE (2) DE10205750A1 (fr)
WO (1) WO2003069154A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1780406B1 (fr) * 2005-10-25 2011-01-05 CRT Common Rail Technologies AG Injecteur pour un système d'injection de carburant et système d'injection de carburant avec tel injecteur
FI123513B (fi) * 2010-12-02 2013-06-14 Waertsilae Finland Oy Polttoaineen syöttöyksikkö, menetelmä sen käyttämiseksi ja polttomoottori

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9616521D0 (en) 1996-08-06 1996-09-25 Lucas Ind Plc Injector
GB9820237D0 (en) 1998-09-18 1998-11-11 Lucas Ind Plc Fuel injector
DE10031576C2 (de) * 2000-06-29 2002-07-11 Bosch Gmbh Robert Druckgesteuerter Injektor zum Einspritzen von Kraftstoff
JP2002039031A (ja) * 2000-07-10 2002-02-06 Robert Bosch Gmbh 後置された圧力制御エレメントを備えた、燃料を噴射するためのインジェクタ
DE10109610A1 (de) * 2001-02-28 2002-09-05 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
SE523482C2 (sv) * 2001-03-02 2004-04-20 Volvo Lastvagnar Ab Dieselmotor med katalysator
DE10123993A1 (de) * 2001-05-17 2002-11-21 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10123995A1 (de) * 2001-05-17 2002-11-21 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10158659A1 (de) * 2001-11-30 2003-06-12 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10205218A1 (de) * 2002-02-08 2003-10-30 Bosch Gmbh Robert Ventil zur Steuerung einer Verbindung in einem Hochdruckflüssigkeitssystem, insbesondere einer Kraftstoffeinspitzeinrichtung für eine Brennkraftmaschine
DE10205749A1 (de) * 2002-02-12 2003-08-21 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03069154A1 *

Also Published As

Publication number Publication date
US7025284B2 (en) 2006-04-11
DE50203434D1 (de) 2005-07-21
WO2003069154A1 (fr) 2003-08-21
JP2005517859A (ja) 2005-06-16
EP1476655B1 (fr) 2005-06-15
DE10205750A1 (de) 2003-08-21
US20040144365A1 (en) 2004-07-29

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