EP1251266B1 - Druckbegrenzungseinrichtung sowie Kraftstoffsystem mit einer solchen Druckbegrenzungseinrichtung - Google Patents

Druckbegrenzungseinrichtung sowie Kraftstoffsystem mit einer solchen Druckbegrenzungseinrichtung Download PDF

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Publication number
EP1251266B1
EP1251266B1 EP02005094A EP02005094A EP1251266B1 EP 1251266 B1 EP1251266 B1 EP 1251266B1 EP 02005094 A EP02005094 A EP 02005094A EP 02005094 A EP02005094 A EP 02005094A EP 1251266 B1 EP1251266 B1 EP 1251266B1
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel
limiting device
outlet
inlet
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
EP02005094A
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German (de)
English (en)
French (fr)
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EP1251266A1 (de
Inventor
Helmut Rembold
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 EP1251266A1 publication Critical patent/EP1251266A1/de
Application granted granted Critical
Publication of EP1251266B1 publication Critical patent/EP1251266B1/de
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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/005—Pressure relief valves
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

  • the present invention initially relates to a Pressure limiting device for a fuel system Internal combustion engine according to the preamble of claim 1 and a fuel system according to the preamble of claim 5 with a pressure limiting device.
  • Such a pressure limiting device is from the market known. It is preferably in such fuel systems used in internal combustion engines with gasoline direct injection be used. Such Fuel systems usually have one Low pressure area and a high pressure area. A electric fuel pump promotes the fuel in the Low pressure range from which the fuel over a High-pressure pump in a fuel rail ("rail") called) is promoted. The pressure in the fuel rail is usually by a pressure control or a quantity control valve regulated.
  • a hedge against excessive pressure in the To create fuel manifold is in the High pressure area of the fuel system a Pressure limiting device provided.
  • a Pressure limiting device provided.
  • it is generally a common one Pressure relief valve with one of a spring against a valve seat acted upon valve element. exceeds the pressure in the fuel rail a certain Limit value, lifts the valve element from the valve seat, so that fuel from the inlet of the pressure relief valve to Outlet and from there back to the low pressure area of the Fuel system can flow.
  • the facility In general, the facility must be in the area of Fuel bus, so at a certain distance from the high pressure pump. The reason for this is that the high pressure pump in operation pressure pulsations produced, whose tips the opening pressure of Pressure relief valve can exceed. Would that be Pressure relief valve immediately at the high pressure pump there would be a risk that the Pressure relief valve due to the pressure pulsations opens, although the maximum system pressure has not yet reached is. Only at a certain distance from the High pressure pump, it comes to a smoothing of Pressure pulsations due to the throttle effects in the Fuel line and due to the compressibility of the Fuel.
  • From DE 39 12 106 A1 is also a Fuel injection device according to the pump-nozzle principle known. It shows a pressure limiting device, which comprises a cylindrical valve pin, the partially received in a housing-side bore and at its end projecting into the bore a chamfer having. At an impermissible pressure increase deviates Valve pin out until the chamfer comes out of the hole. As a result, a fluid connection with a Low pressure area created.
  • JP 09242639 A is a pressure relief valve with a Valve piston known which has a pressure stage. hereby ensures that when exceeding one Limit pressure in any case, the valve fully opens. One Evasion volume is not provided in this device.
  • the present invention therefore has the object, a Pressure limiting device of the type mentioned so to further develop that pressure pulsations as little as possible occur.
  • This object is in a pressure limiting device of by the type mentioned by the characterizing features of claim 1 solved.
  • a fuel system of the type mentioned is the task solved by the characterizing features of claim 5.
  • a comparatively large hydraulic Effective equalization volume immediately after the withdrawal of the Sealing edge connected from the valve seat This allows the effective damping even very hard pressure surges, which is through a steep gradient at low pressure difference distinguished.
  • the maximum possible evasion volumes by the maximum possible distance the control edge determined by the outlet opening are realized.
  • Pressure limiting device In a first embodiment of the invention Pressure limiting device is proposed that the Pressure limiting device a hydraulic resistance, in particular, a flow restrictor, which, in the inlet is arranged to the escape volume.
  • a flow restrictor By such Flow restrictor prevents it in the escape volume too an overshoot comes.
  • the antechamber provided in another development, which is present in the inlet to the evasive volume.
  • the inlet-side section of Piston has a rounded waisted area.
  • the present invention also relates to a fuel system for supplying fuel for an internal combustion engine, with a reservoir, with a first fuel pump, which is connected on the input side to the reservoir, with a second fuel pump, which on the input side over a fuel connection with the first fuel pump is connected, and with a pressure limiting device, which the pressure in a fuel connection on the Output side of the second fuel pump limited.
  • the second fuel pump includes a 1-cylinder piston pump.
  • a Fuel pump are the delivery pulsations especially pronounced, so that here the inventive Pressure limiting device works very effectively.
  • Fuel system according to the invention is the Pressure limiting device to the second fuel pump grown, preferably integrated into this.
  • Such Arrangement of the pressure limiting device within the Fuel system has the advantage of being on a Return line from the pressure limiting device for example, to the low pressure region of the fuel system can be waived. This will be the cost of the Fuel system according to the invention significantly reduced.
  • a fuel system carries the whole Reference numeral 10. It includes a low-pressure region 12 and a high pressure area 14.
  • the low-pressure region 12 comprises a reservoir 16, is stored in the fuel 18.
  • the fuel 18 is from the reservoir 16 of a first Fuel pump 20 promoted. This one is about an electric fuel pump.
  • the electric Fuel pump 20 delivers into a low pressure fuel line 22.
  • a filter 24 is provided.
  • a branch line 26 Seen in the flow direction yet before the filter 24 branches off the low-pressure fuel line 22 a branch line 26 from which, to the Reservoir 16 returns.
  • a pressure relief valve 28 is arranged in the branch line 26 .
  • the low-pressure fuel line 22 leads to a second Fuel pump 30.
  • the second fuel pump 30 is a 1-piston high-pressure pump. Upstream of the high pressure pump 30 are still in the low pressure fuel line 22 a Pressure damper 32 and a check valve 34 is arranged.
  • a branch line 36th from, in which a low pressure regulator 38 is arranged.
  • the Branch line 36 also leads to the reservoir 16 for the fuel 18 back. From the high pressure pump 30 leads a leakage line 40 to the branch line 36th
  • Fuel line 42 On the output side promotes the high-pressure pump 30 in one Fuel line 42, which via a check valve 44th leads to a fuel manifold 46.
  • Fuel manifold 46 To the Fuel manifold 46 are again fuel injectors 48 connected, which the fuel in a combustion chamber, not shown Inject internal combustion engine.
  • the pressure in the Fuel manifold 46 is from a pressure sensor 50 detected.
  • Das Quantity control valve 42 is not from a in Fig. 1 shown control unit, which in turn receives signals from the pressure sensor 50. In this way will be a closed loop for controlling the Pressure in the high pressure region 14 of the fuel system 10th created.
  • the high-pressure pump 30 and the pressure limiting valve 56 are housed in a common housing 58.
  • the exhaust valve 44 comprises a spherical valve element 64, which of a spring 66 is acted upon against a valve seat 68. Downstream of the exhaust valve 44 is the high pressure fuel line 42 visible. During a suction stroke will the delivery chamber 60 opposite the high-pressure fuel line 42 sealed by the outlet valve 44.
  • a conical Extension 76 provided in a cylindrical Valve chamber 80 opens.
  • cylindrical Valve chamber 78 is coaxial with valve chamber 78 cylindrical recess 80 is present, which is a something smaller diameter than the valve chamber 78 has.
  • the cylindrical recess 80 forms a guide for a also cylindrical piston 82. This is below described in detail.
  • the elements from the secondary line 70 to the leakage channel 90 are part of the pressure relief valve 56.
  • the piston 82nd the pressure limiting valve 56 is as follows built up:
  • the outlet side section 94 has a circular cylindrical outer contour with constant Diameter.
  • Fig. 2 is from above into the piston 82 a Blind hole 96 introduced.
  • a spring 98 guided which on the one hand on the piston 82 and on the other hand, at the bottom of the upper recess 88 in the housing 58 supported.
  • This spring 98 is a free edge 100th 2 inlet-side portion 92 of the piston 82nd pressed against the conical extension 76.
  • the conical Extension 76 thus forms a valve seat so far.
  • the inlet side portion 92 of the piston 82 Towards the outlet-side section 94, the inlet side portion 92 of the piston 82 a Constriction 102 in the form of a rounded waisted Area on. This way, between the inlet side section 92 and the outlet side Section 94 a control edge 104 is formed, which the two sections 92 and 94 separated from each other.
  • the Control edge 104 is from the free edge 100 of the inlet side Section 92 spaced so that when the free Edge 100 abuts the valve seat 76, the control edge 104 of the annular groove 84 is spaced.
  • the fuel system 10 with the pressure limiting valve 56 works as follows:
  • the fuel 18 from the reservoir 16 in the low-pressure fuel line 22 promoted.
  • the pressure in the Low pressure fuel line 22 is typically about 4 bar.
  • the fuel under this pressure continues in the high pressure pump 30 to a system pressure compressed by about 120 bar.
  • the pressure peak corresponds to one through the Delivery pulse of the high pressure pump 30 triggered flow rate.
  • This flow rate flows into the secondary line 70 through which Flow restrictor 74 through the antechamber 72.
  • There the flow rate causes the free edge 100 of the inlet side portion 92 of the piston 82 from the valve seat 78 lifts off and the entire piston 82 against the Beaufschlagungskraft of the spring 98 is moved. This leads to to an enlargement of the cylindrical valve chamber 78th
  • the enlargement of the valve chamber 78 in turn corresponds an escape volume into which the fuel flows can.
  • the fuel flows out the cylindrical valve chamber 78 back into the high pressure fuel line 42 back.
  • the piston moves 82 due to the spring action again with his free edge 100 against the valve seat 76.
  • the distance between the control edge 104 and the annular groove 84 is thereby so dimensioned that with a usual pressure peak no Fuel via the annular groove 84 and the flow channel 86th flows.
  • the maximum possible evasive volume corresponds thus the diameter of the outlet side portion 94 of Piston 82 multiplied by the maximum distance between the annular groove 84 and the control edge 104th
EP02005094A 2001-04-18 2002-03-07 Druckbegrenzungseinrichtung sowie Kraftstoffsystem mit einer solchen Druckbegrenzungseinrichtung Expired - Lifetime EP1251266B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10118936 2001-04-18
DE10118936A DE10118936A1 (de) 2001-04-18 2001-04-18 Druckbegrenzungseinrichtung sowie Kraftstoffsystem mit einer solchen Druckbegrenzungseinrichtung

Publications (2)

Publication Number Publication Date
EP1251266A1 EP1251266A1 (de) 2002-10-23
EP1251266B1 true EP1251266B1 (de) 2005-02-23

Family

ID=7681809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02005094A Expired - Lifetime EP1251266B1 (de) 2001-04-18 2002-03-07 Druckbegrenzungseinrichtung sowie Kraftstoffsystem mit einer solchen Druckbegrenzungseinrichtung

Country Status (3)

Country Link
EP (1) EP1251266B1 (ja)
JP (1) JP2002332931A (ja)
DE (2) DE10118936A1 (ja)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3944413B2 (ja) * 2002-05-24 2007-07-11 株式会社日立製作所 高圧燃料供給ポンプ
DE10245084A1 (de) * 2002-09-27 2004-04-01 Robert Bosch Gmbh Druckbegrenzungseinrichtung sowie Kraftstoffsystem mit einer solchen Druckbegrenzungseinrichtung
DE10327411B4 (de) * 2002-10-15 2015-12-17 Robert Bosch Gmbh Druckbegrenzungsventil sowie Kraftstoffsystem mit einem solchen Druckbegrenzungsventil
FR2863316B1 (fr) * 2003-12-04 2007-12-28 Renault Sas Dispositif d'amortissement d'ondes de pression dans une conduite et installation d'injection de carburant equipee d'un tel dispositif
FR2887319B1 (fr) * 2005-06-15 2007-09-28 Eaton Sa Monegasque Limiteur de pression
DE102007016625A1 (de) * 2007-04-05 2008-10-09 Continental Automotive Gmbh Ventil und Einspritzanlage für eine Brennkraftmaschine mit Ventil
DE102010064194A1 (de) * 2010-12-27 2012-06-28 Robert Bosch Gmbh Druckregelanordnung für ein Kraftstoffspritzsystem
DE102010064221A1 (de) * 2010-12-27 2012-06-28 Robert Bosch Gmbh Einspritzpumpe für ein Kraftstoffeinspritzsystem
DE102010064192A1 (de) * 2010-12-27 2012-06-28 Robert Bosch Gmbh Druck-Schaltventil für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine
DE102010064216A1 (de) * 2010-12-27 2012-06-28 Robert Bosch Gmbh Pumpe, insbesondere eines Kraftstoffeinspritzsystems
CN102996433A (zh) * 2012-10-31 2013-03-27 镇江宝城注浆设备有限公司 一种注浆泵安全阀
DE102013224387B4 (de) * 2013-11-28 2019-11-28 Robert Bosch Gmbh Kraftstoffeinspritzsystem sowie Verfahren zum Betreiben eines Kraftstoffeinspritzsystems
DE102014220742B4 (de) 2014-10-14 2021-03-18 Vitesco Technologies GmbH Verfahren zum Betreiben eines Kraftstoffversorgungssystems für eine Brennkraftmaschine
DE102015215186B3 (de) * 2015-08-10 2016-12-15 Continental Automotive Gmbh Kraftstoffhochdruckpumpe

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
DE1203991B (de) * 1963-06-27 1965-10-28 Bosch Gmbh Robert Druckregelventil
DE3912106C2 (de) * 1988-05-02 1996-05-02 Volkswagen Ag Kraftstoffeinspritzvorrichtung
JPH0688557A (ja) * 1992-07-24 1994-03-29 Nippondenso Co Ltd 電磁制御式燃料噴射装置
US5353766A (en) * 1993-09-08 1994-10-11 Cummins Engine Company, Inc. Distributor for a high pressure fuel system
DE19546839C2 (de) * 1995-12-15 2000-04-20 Deutz Ag Druckhaltevorrichtung
JPH09242639A (ja) * 1996-03-08 1997-09-16 Denso Corp 蓄圧式燃料噴射装置
DE19612412B4 (de) * 1996-03-28 2006-07-06 Siemens Ag Regelung für ein Druckfluid-Versorgungssystem, insbesondere für den Hochdruck in einem Kraftstoff-Einspritzsystem
DE19727413A1 (de) * 1997-06-27 1999-01-07 Bosch Gmbh Robert Kraftstoffeinspritzsystem für Brennkraftmaschinen
DE19822671A1 (de) * 1998-05-20 1999-11-25 Bosch Gmbh Robert Druckbegrenzungsventil
DE19852409A1 (de) * 1998-11-13 2000-05-18 Hydraulik Ring Gmbh Druckbegrenzungsventil, insbesondere für Fahrzeuge
DE19933198A1 (de) * 1999-07-15 2001-01-18 Fev Motorentech Gmbh Verfahren zur Druckregelung an einer Einspritzvorrichtung für flüssige Kraftstoffe

Also Published As

Publication number Publication date
EP1251266A1 (de) 2002-10-23
DE50202302D1 (de) 2005-03-31
DE10118936A1 (de) 2002-11-07
JP2002332931A (ja) 2002-11-22

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