EP1392965B1 - Amplificateur de pression pour systeme d'injection de carburant - Google Patents

Amplificateur de pression pour systeme d'injection de carburant Download PDF

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Publication number
EP1392965B1
EP1392965B1 EP02735066A EP02735066A EP1392965B1 EP 1392965 B1 EP1392965 B1 EP 1392965B1 EP 02735066 A EP02735066 A EP 02735066A EP 02735066 A EP02735066 A EP 02735066A EP 1392965 B1 EP1392965 B1 EP 1392965B1
Authority
EP
European Patent Office
Prior art keywords
pressure
piston
pressure intensifier
fuel
space
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
EP02735066A
Other languages
German (de)
English (en)
Other versions
EP1392965A1 (fr
Inventor
Wolfgang Braun
Bernd Mahr
Martin Kropp
Hans-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
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 EP1392965A1 publication Critical patent/EP1392965A1/fr
Application granted granted Critical
Publication of EP1392965B1 publication Critical patent/EP1392965B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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 pressure amplifier of a fuel injection device according to the preamble of claim 1.
  • the fuel injection device according to the invention may be formed both stroke-controlled and pressure-controlled.
  • a stroke-controlled fuel injection device is understood to mean that the opening and closing of the injection opening takes place by means of a displaceable nozzle needle due to the hydraulic interaction of the fuel pressures in a nozzle chamber and in a control chamber. A pressure reduction within the control chamber causes a stroke of the nozzle needle. Alternatively, the deflection of the nozzle needle by an actuator (actuator, actuator) take place.
  • a pressure-controlled fuel injection device In a pressure-controlled fuel injection device according to the invention, the nozzle needle is moved by the pressure prevailing in the nozzle chamber of an injector fuel pressure against the action of a closing force (spring), so that the injection port for injection of the fuel from the nozzle chamber is released into the cylinder.
  • injection pressure The pressure with which fuel exits the nozzle chamber into a cylinder of an internal combustion engine
  • system pressure is understood to mean the pressure below which fuel is available or stored in the fuel injector.
  • control channel is replaced by a Relative movement of two pistons released during reset. At the Compression stroke, the additional control channel is closed, so that the Leakage losses can be reduced.
  • the restoring force is through the control channel after a large piston stroke (> h) has occurred through the released control channel facilitated.
  • the pressure booster 9a of a first embodiment in a further development of the prior art according to FIG. 5 has a first piston 30a and a second piston 31a (two-part piston formation). There is a continuous power transmission from the first piston 30a to the second piston 31a instead, when a piston surface 32 is pressurized in the connection of the pressure booster 9a (open valve 15). During the connection of the pressure booster 9a, a control amount of fuel flows via a first control passage 33 with a first throttle 34 and a differential space 10a in the leakage line 16.
  • an additional second control channel 35 is formed, which includes a second throttle 36 .
  • the pressure booster 9a open valve 15
  • the plate spring 37a is compressed by the force transmission from the first piston 30a to the second piston 31a and a gap 38a is closed between the pistons 30a and 31a, whereby the second control channel 35 is closed.
  • Fig. 2 relates to a similar to FIG. 1 arrangement.
  • Identical or similar components are designated by the same or similar reference numerals (9a ⁇ 9b, 10a ⁇ 10b, 13a ⁇ 13b, 30a ⁇ 30b, 31a ⁇ 31b, 37a ⁇ 37b, 38a ⁇ 38b). Differences in the arrangement come about through the plate spring 37b, the sealing gap 38b and the contact surfaces of the pistons 30b, 31b.
  • a fuel injection device comprises a pressure booster or pressure intensifier 51 with a first piston 52 and a second piston 53.
  • the first piston 51 has a first control channel 55 and a second Control channel 54 with a throttle.
  • the two pistons 52 and 53 are such movably arranged relative to each other, that in the provision of a gap occurs, an additional connection between Schoduck Schom Booster chamber 56 and differential space 57 releases through the channel 54.
  • the Relative movement of the pistons 52 and 53 is by a stop (Connecting means 58) and a spring 59 limited.
  • the pistons 52 and 53 abut each other as shown in Fig. 3 and thus close the additional control channel 54.
  • the opening and the Closing of the gap are by the piston stroke of the pistons 52 and 53 - in similar to that shown in Fig. 1 and described - controlled.
  • Fig. 4 is a pressure amplifier 61 of an embodiment in development of a prior art shown in FIG. 5.
  • the first control channel 62 connects the low-pressure side control chamber 67 permanently with a differential space 68.
  • the second control channel 64 provides a piston stroke-dependent connection between the rooms 67 and 68 ago. After one Piston stroke h, the connection is released. On provision after a successful large piston stroke (> h) is the restoring force through the control channels 62 and 64th facilitated. At a small piston stroke ( ⁇ h), the control channel 64 is sufficient, so that Leakage losses can be kept within limits.
  • FIG. 5 In the stroke-controlled fuel injection device 1 shown in FIG. 5 promotes a volume-controlled fuel pump 2 fuel 3 from a Storage tank 4 via a feed line 5 in a central pressure storage chamber. 6 (Common rail), of which several, corresponding to the number of individual cylinders Pressure lines 7 to the individual, in the combustion chamber to be supplied Remove internal combustion engine protruding injectors 8 (injector).
  • FIG. 3 shows only one of the injectors 8.
  • Fuel pump 2 With the help of Fuel pump 2, a first system pressure is generated and in the pressure storage space 6 stored. This first system pressure is used for pre-injection and when needed and Post-injection (HC enrichment for exhaust aftertreatment or soot reduction) and to represent a course of injection with plateau (boat injection) used.
  • Post-injection HC enrichment for exhaust aftertreatment or soot reduction
  • To inject fuel with a second higher system pressure is everyone Injector 8 each associated with a local pressure booster 9, which is within a Injector 8 is located.
  • the differential space 10 For refilling and deactivation of the booster 9 is the differential space 10 with a supply pressure (rail pressure) acted upon. Then prevail at all pressure surfaces of a piston 11, the same pressure conditions (Rail pressure).
  • the piston 11 is pressure balanced. By an additional spring the piston 11 is pressed into its initial position.
  • the differential space 10 is depressurized and the Pressure booster generates a pressure boost according to the area ratio.
  • a throttle 14 and a 2/2-way valve 15 used for controlling the pressure booster 9, a throttle 14 and a 2/2-way valve 15 used.
  • the throttle 14 connects the differential space 10 with below Supply pressure of stationary fuel from an accumulator 6.
  • the 2/2-way valve 15 connects the differential space 10 to a leakage line 16 at. are the 2/2-way valves 15 and 17 closed, the injector 8 is below the Pressure of the pressure storage chamber 6.
  • the pressure booster 9 is located in the Starting position. Now can through the valve 17 an injection with rail pressure to be controlled. If an injection with higher pressure is desired, then the 2/2-way valve 15 is activated (opened) and thus a pressure boost reached.
  • the piston 11 can be moved in the compression direction, so that the Compressed in the pressure booster chamber 12 located fuel and a control room 18 and a nozzle chamber 19 is supplied.
  • a check valve 20 prevents the return flow of compressed fuel into the pressure storage space 6.
  • the injection takes place via a fuel metering with the help of one in one Guide bore axially displaceable nozzle needle 21 with a conical Valve sealing surface at one end, with which it has a valve seat on Injector housing of the injector 8 cooperates.
  • injection openings are provided at the valve seat surface of the Injector housing.
  • Inside the nozzle chamber 19 is a in the opening direction of the nozzle needle 21 facing pressure surface there subjected to prevailing pressure, via a pressure line 22 to the nozzle chamber 19th is supplied.
  • Coaxial with a valve spring also engages the nozzle needle 21 Pressure piece 23 on, with its side facing away from the valve sealing face 24th limited the control room 18.
  • the control chamber 18 has the fuel pressure connection fro an inlet with a first throttle 25 and a drain to a Pressure relief line 26 with a second throttle 27, through the 2/2-way valve 17 is controlled.
  • the nozzle chamber 19 is placed over an annular gap between the nozzle needle 21st and the guide bore continues to the valve seat surface of the injector housing. about the pressure in the control chamber 18, the pressure member 22 in the closing direction pressurized.
  • the end of the injection is achieved by pressing (closing) the 2/2-way valve again 17 introduced, the control chamber 18 again from the leakage line 26 decouples, so that in the control chamber 18 again builds up a pressure that the Pressure piece 23 can move in the closing direction.
  • bypass line 28th intended.
  • the bypass line 28 is connected directly to the pressure line 22.
  • the bypass line 28 is usable for injection with rail pressure and is arranged parallel to the pressure booster chamber 12, so that the bypass line 28th regardless of the movement and position of the piston 11 is continuous.

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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 (6)

  1. Amplificateur de pression (9, 9a, 9b, 51, 61) d'une installation d'injection de carburant (1) comprenant une unité de piston coulissant (11, 30a, 30b, 31a, 31b, 52, 53, 66), sollicité en pression à une extrémité par une chambre d'amplification de pression (13, 13a, 13b, 56, 67) du côté basse pression et à l'autre extrémité par une chambre d'amplification de pression (12) du côté haute pression pour comprimer le carburant, dans lequel
    l'unité de piston (11, 30a, 30b, 31a, 31b, 52, 53, 66) une seconde section de piston réduite par rapport à la première section de piston pour l'application de la pression, pour former une chambre différentielle (10, 10a, 10b, 57, 68) susceptible d'être raccordée à une conduite de fuite (16) par une vanne commandée (15),
    au moins un canal de commande (33, 35, 54, 55, 62, 64) relie la chambre d'amplification de pression (13, 13a, 13b, 56, 67) du côté basse pression à la chambre différentielle (10, 10a, 10b, 57, 68), et
    la chambre d'amplification de pression (13, 13a, 13b, 56, 67) du côté basse pression, la chambre d'amplification de pression du côté haute pression et la chambre différentielle (10, 10a, 10b, 57, 68) sont remplies de carburant à la pression du système lorsque la soupape (15) est fermée,
    caractérisé en ce que
    l'ouverture du canal de commande (33, 35 ; 54, 55, 62, 64) est fermée ou libérée en fonction du mouvement au moins de parties de l'unité de piston (30a, 31a, 30b, 31b, 52, 53, 66).
  2. Amplificateur de pression selon la revendication 1,
    caractérisé en ce qu'
    au moins un canal de commande (33, 35, 54, 55, 62, 64) est intégré à l'unité de piston (30a, 31a, 31a, 31b, 52, 53, 66).
  3. Amplificateur de pression selon l'une des revendications précédentes,
    caractérisé en ce qu'
    au moins un canal de commande (33, 35, 54, 55, 62, 64) comporte un organe d'étranglement (34, 36, 63, 65).
  4. Amplification de pression selon l'une des revendications précédentes,
    caractérisé en ce que
    l'unité de piston comporte au moins deux parties et le moyen de liaison (37a, 37b, 59) est réalisé pour que les pistons (30a, 31a, 30b, 31b, 52, 53) effectuent un mouvement relatif entre la course de transfert de l'amplificateur de pression (9a, 9b, 51) et le mouvement de rappel de l'amplificateur de pression (9a, 9b, 51), et ce mouvement relatif ouvre ou ferme au moins un canal de commande (35, 54).
  5. Amplificateur de pression selon la revendication 4,
    dans lequel
    l'ouverture d'au moins un canal de commande (35, 55) se trouve dans un intervalle (38a, 38b) entre un premier piston (30a, 30b, 52) et un second piston (31a, 31b, 53) et est commandée par un ressort (37a, 37b), de façon qu'en branchant l'amplificateur de pression (9a, 9b, 51), l'ouverture soit fermée et que le mouvement relatif des pistons (30a, 31a, 30b, 31b, 52, 53) les uns par rapport aux autres soit libéré lorsque l'amplificateur de pression (9a, 9b, 51) est coupé.
  6. Amplificateur de pression selon l'une des revendications 1 à 3,
    caractérisé en ce que
    l'ouverture est libérée pour une course de transfert > h exécutée par une unité de piston (66) de préférence en une seule pièce.
EP02735066A 2001-05-11 2002-05-10 Amplificateur de pression pour systeme d'injection de carburant Expired - Lifetime EP1392965B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10124207 2001-05-11
DE10124207A DE10124207A1 (de) 2001-05-11 2001-05-11 Druckverstärker einer Kraftstoffeinspritzeinrichtung
PCT/DE2002/001701 WO2002092999A1 (fr) 2001-05-11 2002-05-10 Amplificateur de pression pour systeme d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1392965A1 EP1392965A1 (fr) 2004-03-03
EP1392965B1 true EP1392965B1 (fr) 2005-07-27

Family

ID=7685241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02735066A Expired - Lifetime EP1392965B1 (fr) 2001-05-11 2002-05-10 Amplificateur de pression pour systeme d'injection de carburant

Country Status (5)

Country Link
US (1) US6883498B2 (fr)
EP (1) EP1392965B1 (fr)
JP (1) JP2004527685A (fr)
DE (2) DE10124207A1 (fr)
WO (1) WO2002092999A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JP4075894B2 (ja) * 2004-09-24 2008-04-16 トヨタ自動車株式会社 燃料噴射装置
US7588012B2 (en) 2005-11-09 2009-09-15 Caterpillar Inc. Fuel system having variable injection pressure
SE529810C2 (sv) * 2006-04-10 2007-11-27 Scania Cv Ab Insprutningsorgan för en förbränningsmotor
US7832374B2 (en) * 2008-10-21 2010-11-16 Gm Global Technology Operations, Inc. Fuel pressure amplifier
US8775054B2 (en) 2012-05-04 2014-07-08 GM Global Technology Operations LLC Cold start engine control systems and methods

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51101628A (fr) * 1975-01-24 1976-09-08 Diesel Kiki Co
DE3102697A1 (de) * 1980-12-20 1982-10-21 Volkswagenwerk Ag, 3180 Wolfsburg Kraftstoffeinspritzeinrichtung
US4372272A (en) * 1981-07-31 1983-02-08 The Bendix Corporation Fuel delivery system with feed and drain line damping
US4485789A (en) * 1981-07-31 1984-12-04 The Bendix Corporation Fuel injector with inner chamber vacuum
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
DE19531870C2 (de) * 1995-08-30 2002-07-18 Bosch Gmbh Robert Kraftstoffeinspritzsystem
DE19910970A1 (de) 1999-03-12 2000-09-28 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
DE19939422A1 (de) 1999-08-20 2001-03-01 Bosch Gmbh Robert Kraftstoffeinspritzsystem für eine Brennkraftmaschine

Also Published As

Publication number Publication date
EP1392965A1 (fr) 2004-03-03
US6883498B2 (en) 2005-04-26
DE10124207A1 (de) 2002-11-21
WO2002092999A1 (fr) 2002-11-21
US20040206335A1 (en) 2004-10-21
DE50203765D1 (de) 2005-09-01
JP2004527685A (ja) 2004-09-09

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