EP1899597A1 - Injecteur equipe d'un multiplicateur de pression raccordable - Google Patents

Injecteur equipe d'un multiplicateur de pression raccordable

Info

Publication number
EP1899597A1
EP1899597A1 EP06752574A EP06752574A EP1899597A1 EP 1899597 A1 EP1899597 A1 EP 1899597A1 EP 06752574 A EP06752574 A EP 06752574A EP 06752574 A EP06752574 A EP 06752574A EP 1899597 A1 EP1899597 A1 EP 1899597A1
Authority
EP
European Patent Office
Prior art keywords
pressure
chamber
booster
injector
injection
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.)
Ceased
Application number
EP06752574A
Other languages
German (de)
English (en)
Inventor
Christoph Buehler
Juergen Frasch
Christoph Butscher
Michael Fleig
Stephan Wehr
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 EP1899597A1 publication Critical patent/EP1899597A1/fr
Ceased 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification

Definitions

  • the rail pressure is generated by the high pressure pump and stored in a rail.
  • This pressure booster serves to increase the fuel pressure provided by a rail or high-pressure fuel pump in order to achieve higher injection pressures without the injection pressure prevailing in the high-pressure fuel pump and the rail.
  • one end of the nozzle needle limits a control chamber, and with a first control valve which hydraulically separates the control chamber from a return in a first switching position and in a second switching position the control chamber is hydraulically connected via an outlet throttle to the return, and with a high-pressure port, which acts on a pressure shoulder of the nozzle needle with pressurized fuel and supplies via an inlet throttle the control chamber with fuel, according to the invention provided that between the high pressure port on the one hand and the control chamber and the pressure shoulder on the other hand, a pressure booster is arranged, and that the pressure booster can be activated or deactivated.
  • Another advantage of the invention is the fact that a leak occurs in the region of the nozzle needle only at the times in which the nozzle needle is open. At this time, however, the leakage is unproblematic.
  • the pressure booster has a translation piston displaceable in a bore whose end faces each delimit a pressure chamber, a first larger end face of the transmission piston defining a first pressure chamber connected to the high-pressure port, a second, opposite small end face of the pressure booster piston having a second, with the Pressure shoulder and the control room connected pressure chamber limited, and wherein between the first pressure chamber and the second pressure chamber, a hydraulic connection with a first check valve is provided.
  • a particularly compact design is characterized in that in addition the first check valve is arranged in the booster piston. This makes it possible to check the first check valve, as soon as it is preassembled in the booster piston, outside the actual injector and, if necessary, to adjust to the desired opening pressure.
  • a further advantageous embodiment of the pressure booster according to the invention provides that a change in cross section of the booster piston and a shoulder in a housing of the pressure booster limit a discharge space, and that the discharge space is selectively connectable to the return or the high pressure port.
  • the relief chamber is hydraulically connected to the return, the transmission piston can move as soon as the first pressure chamber is acted upon by pressure from the rail and so make an increase in pressure.
  • the switching on and off of the pressure booster by means of a second control valve is made, which connects the discharge chamber optionally with the return or the high pressure port.
  • the return spring can be arranged in the first pressure chamber or in the relief chamber.
  • Figure 1 is a schematic representation of a fuel injection system with an injector according to the invention.
  • Figure 2 shows the representation of the time course of the injection pressure.
  • FIG. 1 shows a fuel injection system consisting of a tank 1, a high-pressure fuel pump 3, a rail 5 and an injector 7 is shown greatly simplified. In Figure 1, only one injector 7 is shown.
  • the other injectors are for the sake of
  • a return 13 of the injector 7 returns the control and leakage amounts in the tank 1.
  • the injector 7 according to the invention can be subdivided into three subassemblies.
  • the first assembly comprises an injection module 15, the second assembly comprises a Pressure booster 17, while the third assembly consists of a first control valve 19 and a control valve 21.
  • the injection module 15 is constructed as in conventional injectors.
  • a nozzle needle 23 is guided, which has a sealing cone 25 at one end.
  • the sealing cone 25 is pressed by means of a closing spring 27 against a sealing seat (without reference numeral) of the housing. In this position of the nozzle needle 23, the injector 7 is closed and there is no injection.
  • the nozzle needle 23 delimits a control chamber 29.
  • the control chamber 29 is delimited by a sleeve 31, against which the closing spring 25 is supported.
  • the sleeve 31 is pressed sealingly against a shoulder in the housing of the injector 7. Since the diameter of the nozzle needle 23 in the region of the control chamber 29 is greater than the diameter of the sealing seat between the sealing cone 25 and the housing, forms a pressure shoulder on the nozzle needle 23, which exerts a hydraulic force on the nozzle needle 23, which of the Closing spring 27 applied force is directed opposite.
  • both a pressure chamber 30, which surrounds the nozzle needle 23, and the control chamber 29 are supplied with pressurized fuel.
  • an inlet throttle not shown, is provided in the section 33 a of the high-pressure passage.
  • the control chamber 29 is via an outlet throttle (not shown) and the first control valve 19 with the return 13 connected when the first control valve is open. This switching position of the first control valve 19 is shown in FIG.
  • the pressure booster 17 has a booster piston 35.
  • a first pressure chamber 37 of the pressure booster 17 is connected directly to the high pressure port 11, while a second pressure chamber 39 is hydraulically connected to the high pressure passage 33.
  • the end faces of the booster piston 35 are not formed in the embodiment shown in Figure 1 as flat surfaces. However, this does not change the fact that, when the first pressure chamber 37 is acted upon by the pressure from the rail 5, the booster piston 35 is pressed down and because of the smaller diameter of the second pressure chamber 37 there is a correspondingly greater pressure is produced. However, this only applies if a relief space 43 arranged between a shoulder in the housing of the injector and a cross-sectional change 41 of the booster piston 35 is depressurized.
  • the pressure booster 17 can be deactivated by the second control valve 21 is brought into the second switching position, not shown in Figure 2.
  • the relief space 43 is acted upon by the pressure prevailing in the rail 5, so that acting on the shoulder 41 of the booster piston 35, a force that pushes the booster piston 35 in Figure 1 upwards.
  • This return movement of the booster piston 35 is additionally supported by a return spring 45, which is arranged in the embodiment of the pressure booster 17 shown in Figure 1 within the first pressure chamber 37.
  • a stroke stop 47 and a projection 49 are provided on the booster piston 35. In between, the return spring 45 is clamped.
  • Second switching position is brought by a longitudinal bore 51 and a check valve 53, which are both arranged in the booster piston 35, the fuel from the rail 5 via the high-pressure port 11, the longitudinal bore 51, the check valve 53 and the high-pressure passage 33 in the control chamber 29 and the Pressure chamber 30 arrive.
  • the injection module 15 operates in the same way as a conventional injector without pressure booster.
  • leakage occurs only along with the sleeve 31 prestressed by a closing spring 27 when the first control valve 19 is open. In contrast, no or only a small leakage occurs when the injection valve is closed. For example, such leakage occurs at the guide diameter of the valve needle of a solenoid valve.
  • FIG. 2 the time course of the injection pressure is shown in diagram form.
  • a pre-injection VE is carried out with a low injection pressure.
  • a main injection HE which can take place, for example, according to line 55a, 55b or 55c.
  • These three exemplary injection curves of the main injection HE show very clearly that an injection curve shaping is possible within wide limits.
  • a first post-injection NEi takes place, in which the pressure is smaller than in the main injection, but greater than in the pre-injection VE.
  • post-injection NE 2 which may, for example, have a time course according to line 57a or line 57b. Also in this second post-injection NE 2 , which takes place with a similar injection pressure as the pre-injection VE, the injection duration can be varied within wide limits by a suitable control of the first control valve 19.
  • injector according to the invention can be controlled independently of each other by the two control valves 19 and 21, the pressure ratio and the duration or the beginning and end of an injection.
  • Injection course can be variably formed in very wide limits.
  • a ramp-shaped injection course for example, a rectangular injection course or a boat-shaped injection course is possible.
  • control valves 19 and 21 all known from the prior art types of valves, whether it be slide and / or slit-controlled valves conceivable.
  • the actuation of the valves can also be effected by electromagnets or piezoactuators or other actuators.

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 injecteur (1) dont le multiplicateur de pression (17) peut être connecté ou déconnecté, de sorte qu'il soit possible de commander, dans une large mesure, non seulement la durée d'injection, mais aussi l'évolution de la pression d'injection pendant le processus d'injection.
EP06752574A 2005-06-29 2006-05-09 Injecteur equipe d'un multiplicateur de pression raccordable Ceased EP1899597A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005030220A DE102005030220A1 (de) 2005-06-29 2005-06-29 Injektor mit zuschaltbarem Druckübersetzer
PCT/EP2006/062160 WO2007000371A1 (fr) 2005-06-29 2006-05-09 Injecteur equipe d'un multiplicateur de pression raccordable

Publications (1)

Publication Number Publication Date
EP1899597A1 true EP1899597A1 (fr) 2008-03-19

Family

ID=36648778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06752574A Ceased EP1899597A1 (fr) 2005-06-29 2006-05-09 Injecteur equipe d'un multiplicateur de pression raccordable

Country Status (5)

Country Link
US (1) US20080265054A1 (fr)
EP (1) EP1899597A1 (fr)
CN (1) CN101213363A (fr)
DE (1) DE102005030220A1 (fr)
WO (1) WO2007000371A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7832374B2 (en) * 2008-10-21 2010-11-16 Gm Global Technology Operations, Inc. Fuel pressure amplifier
DE102010029257A1 (de) 2010-05-25 2011-12-01 Robert Bosch Gmbh Injektor mit einem Druckübersetzer
CN101984247B (zh) * 2010-11-04 2013-07-31 中国第一汽车集团公司 增压共轨喷油系统
US8775054B2 (en) 2012-05-04 2014-07-08 GM Global Technology Operations LLC Cold start engine control systems and methods
US10982635B2 (en) * 2012-05-29 2021-04-20 Delphi Technologies Ip Limited Fuel injector and method for controlling the same
JP6562028B2 (ja) * 2017-04-11 2019-08-21 トヨタ自動車株式会社 内燃機関の制御装置
CN104879258A (zh) * 2015-03-27 2015-09-02 中国北方发动机研究所(天津) 一种液压放大式超高压燃油供给装置
DE102020212697B4 (de) 2020-10-08 2022-08-25 Ford Global Technologies, Llc Injektor, Dieselmotor und Kraftfahrzeug

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2885076B2 (ja) * 1994-07-08 1999-04-19 三菱自動車工業株式会社 蓄圧式燃料噴射装置
DE19910970A1 (de) 1999-03-12 2000-09-28 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
DE19939429A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
DE10063545C1 (de) * 2000-12-20 2002-08-01 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
GB2394001B (en) * 2001-12-03 2004-06-16 Daimler Chrysler Ag Injection system operating with pressure intensification
DE10229419A1 (de) * 2002-06-29 2004-01-29 Robert Bosch Gmbh Druckübersetzter Kraftstoffinjektor mit schnellem Druckabbau bei Einspritzende
DE10246208A1 (de) * 2002-10-04 2004-04-15 Robert Bosch Gmbh Einrichtung zur Unterdrückung von Druckwellen an Speichereinspritzsystemen
DE10325620A1 (de) * 2003-04-02 2004-10-14 Robert Bosch Gmbh Servoventilangesteuerter Kraftstoffinjektor mit Druckübersetzer
DE102004024527A1 (de) * 2004-05-18 2005-12-15 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007000371A1 *

Also Published As

Publication number Publication date
WO2007000371A1 (fr) 2007-01-04
DE102005030220A1 (de) 2007-01-04
CN101213363A (zh) 2008-07-02
US20080265054A1 (en) 2008-10-30

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