EP1218631A2 - Multiplicateur de pression et systeme d'injection de carburant dote dudit multiplicateur - Google Patents

Multiplicateur de pression et systeme d'injection de carburant dote dudit multiplicateur

Info

Publication number
EP1218631A2
EP1218631A2 EP00979424A EP00979424A EP1218631A2 EP 1218631 A2 EP1218631 A2 EP 1218631A2 EP 00979424 A EP00979424 A EP 00979424A EP 00979424 A EP00979424 A EP 00979424A EP 1218631 A2 EP1218631 A2 EP 1218631A2
Authority
EP
European Patent Office
Prior art keywords
pressure
booster
injection
piston
spring
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
EP00979424A
Other languages
German (de)
English (en)
Other versions
EP1218631B1 (fr
Inventor
Martin Kropp
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 EP1218631A2 publication Critical patent/EP1218631A2/fr
Application granted granted Critical
Publication of EP1218631B1 publication Critical patent/EP1218631B1/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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/105—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive hydraulic drive
    • 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 invention relates to a pressure booster for increasing the injection pressure in direct-injection internal combustion engines, in particular diesel engines, with a booster piston, which has a relatively large end face, which is acted upon by a relatively low pressure, and a relatively small end face, on which in
  • the invention also relates to a fuel injection system, in particular a common rail system, with a high-pressure connection, which is connected to an injector, from which fuel is injected into the combustion chamber of an internal combustion engine.
  • Both pressure-controlled (DE 197 06 467 Cl) and stroke-controlled (DE 196 19 523 AI) injection systems are known for introducing fuel into direct-injection diesel engines. It is advantageous if the injection pressure is adapted to the load and speed, as can be the case with a common rail system.
  • a high-pressure pump possibly with the help of a pre-feed pump, conveys the fuel to be injected from a tank into the central high-pressure fuel reservoir, which is referred to as the common rail. Lead off the rail
  • the injectors are individually controlled by the engine electronics in order to inject fuel into the combustion chamber of the internal combustion engine.
  • the maximum injection pressures in common rail systems are currently limited to approx. 1600 to 1800 bar due to the high pressure resistance of pressure accumulators and high pressure pumps.
  • injection systems with pressure intensifiers are used.
  • Such a common rail system is e.g. described in EP 0 562 046 B1. It is a pressure-controlled common rail system with a pressure intensifier
  • Booster piston during injection pressure increased t P> o L ⁇ oo in
  • Booster piston which has a relatively large end face, which is subjected to a relatively low pressure, and a relatively small end face, on which there is an increased injection pressure in the delivery stroke, the difference in size between the two on the side facing away from the relatively large end face
  • the end faces of the booster piston result in a dead volume, solved in that the dead volume is connected to an outsourced spring accumulator that is local to each individual cylinder or central to all cylinders of the
  • Diameter ratios can be achieved.
  • a further advantage can arise in a central storage space / diaphragm space common to all cylinders, since the reset can be realized with a few additional components (if a reset was simply carried out using a pre-pressure on the high-pressure side, this pressure would only have to be generated, which would reduce the efficiency ).
  • a special embodiment of the invention is characterized in that the spring accumulator comprises a piston which is biased by a spring.
  • the maximum injection pressure is reduced accordingly by the spring, but this benefits rapid refilling.
  • a small spring may also be arranged in the dead space, which further supports refilling.
  • a special embodiment of the fuel injection system according to the invention is characterized in that the pressure booster is integrated in the injector. In a common rail system, the pressure booster can also be integrated into the rail.
  • such an arrangement can also be used in other injection systems which have such a pressure booster.
  • a pressure booster for example, in the case of a distributor pump, the 3/2 valve upstream of the pressure booster is omitted and is replaced by a distributor with the corresponding 2/2 valve.
  • a pressure booster 1 according to the invention is shown by way of example in the accompanying drawing.
  • the pressure booster 1 comprises a cylinder 2, in which a booster piston 3 is received.
  • the booster piston 3 can be moved back and forth in the cylinder 2 between a low-pressure side 4 and a high-pressure side 5.
  • Low pressure side 4 is actually high pressure, which is provided by a high pressure pump.
  • the booster piston 3 has two differently sized end faces. The end face of the booster piston 3 on the low-pressure side 4 is larger than the end face on the high-pressure side 5. This means that the pressure on the high-pressure side 5 increases when the piston moves from the low-pressure side 4 to the high-pressure side 5.
  • Two lines 6 and 7 extend from the low-pressure side 4 of the cylinder 2.
  • the line 6 is over a
  • 3/2-way valve 8 can be connected to a high-pressure connection 9 or an unpressurized leak return 10.
  • the line 6 In the position shown of the 3/2 way valve 8, the line 6 is connected to the leakage return 10. In this state, the cylinder 2 is filled with fuel on the high-pressure side 5.
  • the line 6 In the other position of the 3/2-way valve 8, the line 6 is connected to a central high-pressure fuel reservoir (rail) via the high-pressure connection 9. In this state, the delivery stroke takes place, during which the fuel located on the high pressure side 5 is compressed.
  • Line 7 is connected against the biasing force of a spring-loaded check valve 11 with two lines 12 and 13.
  • Line 12 leads to
  • High-pressure side 5 of the cylinder 2 ensures that fuel can reach the high-pressure side 5 when refilling.
  • the line 13 leads to a nozzle chamber 14 of an injector 15.
  • a nozzle needle 16 is received so as to be able to move back and forth against the biasing force of a nozzle spring 17.
  • fuel becomes from the nozzle chamber 14 into the combustion chamber 18 of the engine to be supplied injected.
  • a dead volume 20 is provided in the cylinder 2.
  • the dead volume 20 serves to accommodate the collar resulting from the difference in size of the differently sized end faces of the booster piston 3 in the delivery stroke.
  • the dead volume 20 is connected to a via a line 21
  • Spring 22 connected.
  • a piston 23 is accommodated so that it can move back and forth against the biasing force of a compression spring 24.
  • the fuel injection system shown enables improved refilling of the pressure booster 1.
  • the compression spring 24 is swapped out in the spring accumulator 22.
  • the dead volume 20 is pushed out into the spring accumulator 22 and stored there at a defined pressure.
  • the spring accumulator 22 can also be designed as a diaphragm accumulator.
  • the sketch shown is intended for the use of a pressure-controlled system.
  • a stroke-controlled system it is necessary that the line 7 in front of the valve 8 is permanently connected to the line 9 so that the nozzle chamber 14 is permanently under pressure (when the pressure booster is deactivated, under rail pressure).
  • Such a stroke-controlled system naturally also requires a pressure accumulator.

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

Multiplicateur de pression destiné à augmenter la pression d'injection dans des moteurs à combustion interne à injection directe dotés de plusieurs cylindres, en particulier des moteurs diesel. Ledit multiplicateur de pression comporte un piston multiplicateur (3) comprenant une face relativement grande soumise à une pression relativement faible et une face relativement petite sur laquelle s'applique une pression d'injection accrue lors de la course de refoulement, un volume mort (20) étant produit du côté opposé à la face relativement grande par la différence de taille entre les deux faces du piston (3). Selon la présente invention, le volume mort (20) se trouve en communication avec un accumulateur à ressort (22) délocalisé qui est placé localement par rapport à chaque cylindre séparé ou centralement par rapport à tous les cylindres, ce qui garantit un remplissage suffisant et rapide du multiplicateur de pression, même en cas de rapports faibles de multiplication de pression. La présente invention concerne également un système d'injection de carburant doté dudit multiplicateur.
EP00979424A 1999-10-30 2000-10-12 Multiplicateur de pression et systeme d'injection de carburant dote dudit multiplicateur Expired - Lifetime EP1218631B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19952512 1999-10-30
DE19952512A DE19952512A1 (de) 1999-10-30 1999-10-30 Druckverstärker und Kraftstoffeinspritzsystem mit einem Druckverstärker
PCT/DE2000/003596 WO2001033067A2 (fr) 1999-10-30 2000-10-12 Multiplicateur de pression et systeme d'injection de carburant dote dudit multiplicateur

Publications (2)

Publication Number Publication Date
EP1218631A2 true EP1218631A2 (fr) 2002-07-03
EP1218631B1 EP1218631B1 (fr) 2005-03-30

Family

ID=7927541

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00979424A Expired - Lifetime EP1218631B1 (fr) 1999-10-30 2000-10-12 Multiplicateur de pression et systeme d'injection de carburant dote dudit multiplicateur

Country Status (6)

Country Link
US (1) US6634336B1 (fr)
EP (1) EP1218631B1 (fr)
JP (1) JP2003514169A (fr)
KR (1) KR100708224B1 (fr)
DE (2) DE19952512A1 (fr)
WO (1) WO2001033067A2 (fr)

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DE10103089A1 (de) * 2001-01-24 2002-08-08 Bosch Gmbh Robert 3/2-Wegeventil
DE10123914B4 (de) * 2001-05-17 2005-10-20 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung mit Druckübersetzungseinrichtung und Druckübersetzungseinrichtung
DE10218904A1 (de) * 2001-05-17 2002-12-05 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
JP4125963B2 (ja) * 2001-05-17 2008-07-30 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 燃料噴射装置
DE10155406A1 (de) * 2001-11-10 2003-05-22 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10155973A1 (de) * 2001-11-14 2003-05-22 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10158951A1 (de) * 2001-12-03 2003-06-12 Daimler Chrysler Ag Mit Druckübersetzung arbeitendes Einspritzsystem
GB2394001B (en) * 2001-12-03 2004-06-16 Daimler Chrysler Ag Injection system operating with pressure intensification
DE10229412A1 (de) * 2002-06-29 2004-01-29 Robert Bosch Gmbh Kraftstoffinjektor mit Druckübersetzer für Mehrfacheinspritzung
DE10229418A1 (de) * 2002-06-29 2004-01-29 Robert Bosch Gmbh Einrichtung zur Dämpfung des Nadelhubes an Kraftstoffinjektoren
DE10229419A1 (de) * 2002-06-29 2004-01-29 Robert Bosch Gmbh Druckübersetzter Kraftstoffinjektor mit schnellem Druckabbau bei Einspritzende
DE10249840A1 (de) 2002-10-25 2004-05-13 Robert Bosch Gmbh Kraftstoff-Einspritzeinrichtung für Brennkraftmaschine
EP1613856B1 (fr) * 2003-04-02 2008-07-09 Robert Bosch Gmbh Injecteur de carburant comportant un transmetteur de pression commande par une soupape asservie
JP4196868B2 (ja) * 2004-03-31 2008-12-17 三菱ふそうトラック・バス株式会社 燃料噴射装置
DE102004018678B4 (de) * 2004-04-17 2017-06-08 Robert Bosch Gmbh Druckregelvorrichtung
DE102005060552B4 (de) * 2005-12-17 2009-06-10 Man Diesel Se Einspritzvorrichtung für Brennstoffmotoren
JP4600405B2 (ja) * 2007-03-08 2010-12-15 株式会社デンソー インジェクタ
CN101874100A (zh) * 2007-09-27 2010-10-27 因诺斯佩克有限公司 燃料组合物
JP4662292B2 (ja) * 2008-07-14 2011-03-30 株式会社日本自動車部品総合研究所 燃料噴射装置
DE102010008467A1 (de) * 2010-02-18 2011-08-18 Continental Automotive GmbH, 30165 Hochdruck-Kraftstoff-Einspritzventil für einen Verbrennungsmotor
CN102678409B (zh) * 2012-05-21 2014-03-26 哈尔滨工程大学 相继增压式电控共轨喷油系统
US10337638B2 (en) * 2014-12-01 2019-07-02 National Oilwell Varco, L.P. Slow-shift SPM valve

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Also Published As

Publication number Publication date
WO2001033067A2 (fr) 2001-05-10
DE50009933D1 (de) 2005-05-04
KR100708224B1 (ko) 2007-04-17
EP1218631B1 (fr) 2005-03-30
JP2003514169A (ja) 2003-04-15
US6634336B1 (en) 2003-10-21
WO2001033067A3 (fr) 2002-04-25
DE19952512A1 (de) 2001-05-10
KR20010093232A (ko) 2001-10-27

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