EP1392962B1 - Dispositif d'injection de carburant comportant un dispositif multiplicateur de pression et dispositif multiplicateur de pression - Google Patents

Dispositif d'injection de carburant comportant un dispositif multiplicateur de pression et dispositif multiplicateur de pression Download PDF

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Publication number
EP1392962B1
EP1392962B1 EP02742691A EP02742691A EP1392962B1 EP 1392962 B1 EP1392962 B1 EP 1392962B1 EP 02742691 A EP02742691 A EP 02742691A EP 02742691 A EP02742691 A EP 02742691A EP 1392962 B1 EP1392962 B1 EP 1392962B1
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel
space
valve
backspace
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.)
Expired - Lifetime
Application number
EP02742691A
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German (de)
English (en)
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EP1392962A1 (fr
Inventor
Christoph Magel
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1392962A1 publication Critical patent/EP1392962A1/fr
Application granted granted Critical
Publication of EP1392962B1 publication Critical patent/EP1392962B1/fr
Anticipated expiration legal-status Critical
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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
    • 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
    • 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
    • F02M57/026—Construction details of pressure amplifiers, e.g. fuel passages or check valves arranged in the intensifier piston or head, particular diameter relationships, stop members, arrangement of ports or conduits
    • 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
    • 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

Definitions

  • the invention relates to a fuel injection device or a pressure booster device according to the preamble of the independent claims.
  • fuel injection devices or pressure booster devices are already known in which a pressure booster piston by means of a filling or emptying a back space allows an increase in the fuel injection pressure above the value provided by a common rail system addition.
  • the fuel injection device according to the invention or the pressure booster device according to the invention have the advantage that, by means of a valve that connects, for example, depending on the prevailing fuel pressure in the back pressure chamber connected to the high pressure source side of the pressure booster directly to the fuel injector connected to the side, it allows both Filling the backspace with Fuel as well as a closure of the connected to the injector side of the pressure booster from the high-pressure fuel source with this one valve without additional components to ensure.
  • a further advantage is to be considered that the filling of the fuel injector connected to the high-pressure chamber of the pressure booster device does not take place via an example spring-loaded separate check valve, but over a constantly open in the reset phase path. This ensures an improved, in particular faster resetting of the piston of the pressure booster device.
  • an additional control of the combination valve by the pressure build-up in the high pressure chamber is particularly advantageous, so that in addition to the pressure drop in the rear space at the same time the pressure buildup in the high pressure chamber drives the valve body and thus can turn the combination valve very fast.
  • FIG. 1 shows a fuel injection device
  • FIG. 2 shows a pressure booster device in the active state
  • FIG. 3 shows the pressure booster device of a further fuel injection device.
  • the high-pressure fuel source includes a plurality of non-illustrated elements such as a fuel tank, a pump and the high-pressure rail of a conventional rail system known per se, wherein the pump provides up to 1600 bar high fuel pressure in the high-pressure rail by fuel from the tank in the High-pressure rail transported.
  • the injector 10 has a fuel injection valve with a valve member 12, which projects with its injection openings 8 into the combustion chamber 11 of a cylinder of an internal combustion engine.
  • the valve member is surrounded on a pressure shoulder 9 by a pressure chamber 13, which is connected via a high-pressure line 21 to the high-pressure chamber 40 of the pressure booster 30.
  • the control valve 15 is designed as a 2/2-way valve and closed in the first position; in the second position it connects the throttle 19 with a low-pressure line 17.
  • the valve member is resiliently mounted via a return spring 14, wherein the return spring presses the valve member against the injection openings 8.
  • the space of the injection valve of the injector contained in the spring is connected to a further low-pressure line 16.
  • the pressure booster 30 has a spring-mounted piston 36 which separates the high-pressure chamber 40 connected to the high-pressure line 21 from a space 35 which is connected directly to the high-pressure fuel source 60.
  • the spring 39 used for mounting the piston is arranged in a rear space 38 of the pressure booster 30.
  • the piston 36 has a continuation piece 37 which has a smaller diameter than the piston 36 at its end facing the space 35.
  • the rear chamber 38 can be connected via a 2/2-way valve 31 with a low pressure line 32.
  • the low pressure line 32 leads as well as the low pressure lines 16 and 17 back to the fuel tank, not shown.
  • the space 35 of the pressure booster device is connected via a built-in as a bore in the piston throttle 47 with the rear chamber 38.
  • a combination valve 50 is integrated in a bore 58 of the piston 36.
  • the bore communicates with the space 35.
  • a cylindrical valve body 51 is movably mounted.
  • a spring 54 is arranged, which presses the valve body in the relaxed state just so far in the direction of space 35 that the valve chamber 53 on the one hand with a space 35 leading, designed as a bore in the piston feed line 52 and on the other hand with a leading to the high pressure chamber 40, as a bore through the continuation piece 37 running high-pressure chamber line 56 is in communication.
  • valve space 53 is beyond regardless of the position of the valve body 51 via a designed as a bore in the piston 36 and remote from the space 35 end of the bore 58 opening into the bore back space line 55 with the rear chamber 38 in conjunction, since the valve body 51 on its spring 54 side facing a extends through the spring center extension 57 which, as shown in Figure 2, limits the movement of the valve body as soon as it has closed the lines 52 and 56.
  • the mode of operation of the stroke-controlled injector 10 is already known per se from the German patent application DE 199 10 970.
  • At the high pressure line 21 is constantly at a high fuel pressure.
  • Fuel passes from the pressure chamber 13 through the injection openings 8 into the combustion chamber 11, as soon as the valve member is relieved at its end facing away from the injection openings by opening the 2/2-way valve 15 is temporarily relieved of fuel pressure and thus acting on the pressure shoulder 9 in the opening direction acting force is greater than the sum of spring force (14) and force due to remaining in the working space 18 fuel pressure.
  • the valve 15 In the idle state, however, the valve 15 is closed, the injection valve is closed and there is no injection.
  • the pressure of the high-pressure fuel source prevails in the rear space 38, and the pressure booster 30 is pressure balanced, so that no pressure boost takes place.
  • the combination valve 50 is then open and the piston 36, 37 in its initial position, characterized by a large volume of the rear chamber 38.
  • the pressure of the high-pressure fuel source can pass through the open combination valve 50, the supply line 52 and the return chamber line 55 into the back space 38.
  • the pressure of the high-pressure fuel source via the supply line 52 and the high-pressure chamber line 56 reaches the high-pressure chamber 40 and from there to the injector 10. Thus can take place at any time an injection with the pressure of the high-pressure fuel source.
  • the control valve 15 of the injector must be actuated, whereby the injection valve opens. If now an injection with increased pressure take place, then the translator control valve 31 is opened, so that the pressure in the rear chamber 38 may drop, whereby the combination valve 50 closes. In the closed state closes the combination valve 50, as shown in Figure 2, the high-pressure chamber line 56 and the supply line 52. Thus, in the high-pressure chamber 40 to be compressed fuel does not flow back (check valve function of the combination valve) and the fuel flows from the room 35 only throttled via the throttle 47 in the back space 38 (filling valve function of the combination valve).
  • the pressure relief of the back space 38 of the piston 36 is not pressure balanced and there is a pressure gain in the high pressure chamber 40 corresponding to the pressure area ratio of space 35 and high pressure chamber 40.
  • the pressure booster 30 is turned off by closing the booster valve 31, then takes place via the throttle 47 a Pressure equalization between the chambers 35, 38 and 40.
  • the combination valve 50 opens when the pressure in the rear chamber 38 has reached the pressure in the space 35 minus an opening pressure difference.
  • the opening pressure difference of the combination valve is determined by the spring constant of the spring 54 and the hydraulic pressure surfaces of the valve body to the spaces 35 and 53. In the illustrated embodiment, the hydraulic pressure surfaces are the same size.
  • FIG. 3 shows a further embodiment of the fuel injection device according to the invention.
  • the pressure booster device arranged between the high-pressure fuel source 60 and the high-pressure line 21 leading to the injector 10 has a piston 36 with an integrated alternative combination valve 70.
  • the valve body 78 of the combination valve 70 is movably mounted in a cylindrical cavity 88 of the piston 36.
  • a run as a bore in the piston 36 supply line 72 leads from the space 35 into an annular groove 90 of the cavity 88.
  • the back space 38 is independent of the position of the valve body in the cavity via the return line 74 connected to the cavity 88, so that constantly prevailing in the rear space Fuel pressure on the valve body can attack.
  • a spring 80 is stretched between the wall of the cavity 88 and a shoulder of the valve body 78, that in the spring force acting on the valve body mainly forces via the annular groove 90, a fluid exchange between the space 35 and the cavity 88 can take place.
  • an elevation 94 of the valve body arranged at the end facing away from the spring 80 is pressed against the cavity boundary.
  • a designed as a bore in the piston high-pressure chamber line 76 connects the high-pressure chamber 40 with the between the elevation 94 limited pressure surface 92 and the piston wall located part of the cavity 88.
  • the combination valve 50 thus has both a pressure surface to the high pressure chamber 40, the pressure surface 92, as well as a pressure surface to the rear chamber 38, it is closed by a falling pressure in the rear space and by an increasing pressure in the high pressure chamber.
  • the opening spring force of the spring 80 sets the opening pressure difference between the rear space and the high-pressure space to which the combination valve is opened.
  • the sealing function is ensured for the high-pressure chamber line 40 by the flat sealing seat surfaces 82 and for the supply line 72 through the slider sealing edges 84.
  • a pressure increase in the high-pressure chamber is carried out as in the previously described embodiment when opening the booster control valve 31 for pressure relief of the back space 38th

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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)

Claims (10)

  1. Installation d'injection de carburant pour moteurs à combustion interne, comprenant un injecteur de carburant (10) alimenté par une source haute pression de carburant (60), avec
    entre l'injecteur de carburant (10) et la source haute de pression de carburant (60), un dispositif amplificateur de pression (30) muni d'un piston mobile (36) qui sépare une chambre (35) raccordée à la source haute pression de carburant (60) d'une chambre haute pression (40) reliée à l'injecteur,
    la pression du carburant dans la chambre haute pression (40) pouvant varier grâce au remplissage avec du carburant d'une chambre de retour (38) du dispositif amplificateur de pression (30) ou à l'évacuation de carburant de la chambre de retour (38),
    caractérisée en ce qu'
    une soupape (50 ; 70) a un corps de soupape (51 ; 78) mobile prévu de sorte que dans une position du corps de soupape (51 ; 78), aussi bien la chambre haute pression (40) est reliée (56, 53, 52 ; 76, 86, 88, 72) par la soupape (50 ; 70) à la chambre (35), que la chambre de retour (38) est reliée (55, 53, 52 ; 74, 88, 72) par la soupape à la chambre (35).
  2. Installation d'injection de carburant selon la revendication 1,
    caractérisée en ce que
    le corps de soupape (51 ; 78) est mobile en fonction de la pression de carburant régnant dans la chambre de retour (38).
  3. Installation d'injection de carburant selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la soupape (50 ; 70) est intégrée dans le piston (36, 37).
  4. Installation d'injection de carburant selon la revendication 3,
    caractérisée en ce que
    la soupape (50 ; 70) est reliée à la chambre (35), la chambre de retour (38) et la chambre haute pression (40) par des conduites (52, 55, 56 ; 72, 74, 76) réalisées en forme d'alésages intégrés dans le piston.
  5. Installation d'injection de carburant selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le corps de soupape peut être sollicité (55) d'un côté par la pression de carburant régnant dans la chambre de retour (38) et de l'autre côté par la pression de carburant régnant dans la chambre (35).
  6. Installation d'injection de carburant selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce que
    le corps de soupape peut être sollicité (74) d'un côté par la pression de carburant régnant dans la chambre de retour (38) et sollicité (76) de l'autre côté par la pression de carburant régnant dans la chambre haute pression (40), par l'intermédiaire d'une surface de pression (92).
  7. Installation d'injection de carburant selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la chambre (35) est reliée à la chambre de retour (38) par un étranglement (47).
  8. Installation d'injection de carburant selon la revendication 7,
    caractérisée en ce que
    l'étranglement (47) est réalisé sous la forme d'un alésage intégré dans le piston (36, 37).
  9. Installation d'injection de carburant selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la chambre de retour (38) peut être reliée à une conduite basse pression (32) par une soupape de commande (31).
  10. Dispositif amplificateur de pression (30) comprenant un piston mobile (36) qui sépare une chambre (35) pouvant être raccordée à la source haute pression de carburant (60) d'une chambre haute pression (40) pouvant être reliée à l'injecteur de carburant (10), la pression du carburant dans la chambre haute pression (40) pouvant varier grâce au remplissage en carburant d'une chambre de retour (38) du dispositif amplificateur de pression (30) ou à l'évacuation de carburant de la chambre de retour (38),
    caractérisé en ce qu'
    une soupape (50 ; 70) a un corps de soupape (51 ; 78) mobile prévu de sorte que dans une position du corps de soupape (51 ; 78), aussi bien la chambre haute pression (40) est reliée (56, 53, 52 ; 76, 86, 88, 72) par la soupape (50 ; 70) à la chambre (35), que la chambre de retour (38) est reliée (55, 53, 52 ; 74, 88, 72) par la soupape à la chambre (35).
EP02742691A 2001-05-17 2002-04-26 Dispositif d'injection de carburant comportant un dispositif multiplicateur de pression et dispositif multiplicateur de pression Expired - Lifetime EP1392962B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10123914 2001-05-17
DE10123914A DE10123914B4 (de) 2001-05-17 2001-05-17 Kraftstoffeinspritzeinrichtung mit Druckübersetzungseinrichtung und Druckübersetzungseinrichtung
PCT/DE2002/001535 WO2002092992A1 (fr) 2001-05-17 2002-04-26 Dispositif d'injection de carburant comportant un dispositif multiplicateur de pression et dispositif multiplicateur de pression

Publications (2)

Publication Number Publication Date
EP1392962A1 EP1392962A1 (fr) 2004-03-03
EP1392962B1 true EP1392962B1 (fr) 2006-09-13

Family

ID=7685052

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02742691A Expired - Lifetime EP1392962B1 (fr) 2001-05-17 2002-04-26 Dispositif d'injection de carburant comportant un dispositif multiplicateur de pression et dispositif multiplicateur de pression

Country Status (6)

Country Link
US (1) US7066147B2 (fr)
EP (1) EP1392962B1 (fr)
JP (1) JP2004519610A (fr)
KR (1) KR20030017633A (fr)
DE (2) DE10123914B4 (fr)
WO (1) WO2002092992A1 (fr)

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DE10229412A1 (de) * 2002-06-29 2004-01-29 Robert Bosch Gmbh Kraftstoffinjektor mit Druckübersetzer für Mehrfacheinspritzung
DE10247903A1 (de) 2002-10-14 2004-04-22 Robert Bosch Gmbh Druckverstärkte Kraftstoffeinspritzeinrichtung mit innenliegender Steuerleitung
GB0305557D0 (en) * 2003-03-11 2003-04-16 Delphi Tech Inc Fuel injector
US7320310B2 (en) 2003-04-02 2008-01-22 Robert Bosch Gmbh Fuel injector provided with provided with a pressure transmitter controlled by a servo valve
DE10315016A1 (de) 2003-04-02 2004-10-28 Robert Bosch Gmbh Kraftstoffinjektor mit leckagefreiem Servoventil
DE10333787A1 (de) * 2003-07-24 2005-02-24 Volkswagen Mechatronic Gmbh & Co. Kg Pumpe-Düse-Vorrichtung
DE102004017304A1 (de) * 2004-04-08 2005-10-27 Robert Bosch Gmbh Servoventilangesteuerter Kraftstoffinjektor
JP3994990B2 (ja) * 2004-07-21 2007-10-24 株式会社豊田中央研究所 燃料噴射装置
SE529810C2 (sv) * 2006-04-10 2007-11-27 Scania Cv Ab Insprutningsorgan för en förbränningsmotor
DE102006038840A1 (de) * 2006-08-18 2008-02-21 Robert Bosch Gmbh Kraftstoffinjektor mit Kolbenrückholung eines Druckübersetzerkolbens
US20080047527A1 (en) * 2006-08-25 2008-02-28 Jinhui Sun Intensified common rail fuel injection system and method of operating an engine using same
US20090126689A1 (en) * 2007-11-16 2009-05-21 Caterpillar Inc. Fuel injector having valve with opposing sealing surfaces
US8291889B2 (en) 2009-05-07 2012-10-23 Caterpillar Inc. Pressure control in low static leak fuel system
DE102010000828A1 (de) * 2010-01-12 2011-07-14 Robert Bosch GmbH, 70469 Druckverstärkungseinrichtung für ein Kraftstoffeinspritzsystem und Kraftstoffeinspritzsystem
DE102010008467A1 (de) * 2010-02-18 2011-08-18 Continental Automotive GmbH, 30165 Hochdruck-Kraftstoff-Einspritzventil für einen Verbrennungsmotor
US8443780B2 (en) * 2010-06-01 2013-05-21 Caterpillar Inc. Low leakage cam assisted common rail fuel system, fuel injector, and operating method therefor
RU2545020C1 (ru) * 2014-04-28 2015-03-27 Федеральное государственное унитарное предприятие "Центральный ордена Трудового Красного Знамени научно-исследовательский автомобильный и автомоторный институт "НАМИ" Устройство для подачи топлива к форсунке теплового двигателя

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DE3245142A1 (de) * 1982-12-07 1984-06-07 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und vorrichtung zum einspritzen von kraftstoff
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Also Published As

Publication number Publication date
EP1392962A1 (fr) 2004-03-03
KR20030017633A (ko) 2003-03-03
DE10123914A1 (de) 2002-11-28
US20040025845A1 (en) 2004-02-12
WO2002092992A1 (fr) 2002-11-21
DE10123914B4 (de) 2005-10-20
DE50208146D1 (de) 2006-10-26
US7066147B2 (en) 2006-06-27
JP2004519610A (ja) 2004-07-02

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