EP1336043B1 - Kraftstoffeinspritzanlage für brennkraftmaschinen mit verbessertem startverhalten - Google Patents

Kraftstoffeinspritzanlage für brennkraftmaschinen mit verbessertem startverhalten Download PDF

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Publication number
EP1336043B1
EP1336043B1 EP01996683A EP01996683A EP1336043B1 EP 1336043 B1 EP1336043 B1 EP 1336043B1 EP 01996683 A EP01996683 A EP 01996683A EP 01996683 A EP01996683 A EP 01996683A EP 1336043 B1 EP1336043 B1 EP 1336043B1
Authority
EP
European Patent Office
Prior art keywords
pump
fuel
pressure
throttle
control valve
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
EP01996683A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1336043A2 (de
Inventor
Peter Schueler
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 EP1336043A2 publication Critical patent/EP1336043A2/de
Application granted granted Critical
Publication of EP1336043B1 publication Critical patent/EP1336043B1/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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • 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
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • 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
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/025—Means for varying pressure in common rails by bleeding fuel pressure from the common rail

Definitions

  • the invention relates to a high-pressure fuel pump for a Fuel injection system according to the preamble of claim 1.
  • a metering valve on the suction side of the pump elements of High-pressure fuel pump arranged, which is a more or causes less severe throttling.
  • a so-called "zero-feed" throttle to provide by which small amounts of fuel from the Suction side of the pump elements in a fuel return or can drain to the suction side of the prefeed pump. This will prevents pressure on the suction side of the pump elements is constructed and thus the pump elements, the closing force of Suction valves can overcome. As a result, the suck Pump elements no fuel in push mode and the unwanted buildup of pressure in the common rail during the Sliding operation is prevented.
  • the disadvantage of this solution is that the zero-feed throttle is also open when starting the engine and thus the pressure build-up on the suction side of the pump elements is delayed, or more difficult. As a result, the required Internal combustion engine a high starting speed and starts only after a certain time.
  • High-pressure fuel pumps are known where a controllable Throttle between the pre-feed pump and the suction side of the Pump elements of the high-pressure fuel pump is provided.
  • the Control of the throttle via a control unit of the High-pressure fuel pump and an electrically operated Control valve.
  • a disadvantage of these high-pressure fuel pumps are the permanent load of the controller, the electrical Energy demand of the control valve and the possibility that in the High-pressure fuel pump impermissibly high pressures during the Sliding operation occur.
  • the startup behavior one equipped with such a high-pressure fuel pump Internal combustion engine unsatisfactory.
  • the invention is based on the object High-pressure fuel pump for a fuel injection system to provide the starting behavior of the Internal combustion engine is improved and at the same time Pressure build-up in the high-pressure fuel pump in overrun mode effectively prevented.
  • the throttle is closed during startup, so that the pressure build-up on the suction side of the pump elements is faster and thus the starting behavior of the internal combustion engine is improved.
  • the throttle is controlled by a loaded with the fuel pressure on the pressure side of the feed pump control valve, the control of the throttle is simple and reliable manner.
  • a control unit of the fuel injection system is not needed for this purpose. As a result, the control unit and the electrical system are relieved and simplifies the wiring harness.
  • the throttle closes when the fuel pressure on the pressure side of the feed pump falls below a first reference value, so that in all operating conditions in which the fuel supply to the high-pressure fuel pump is deficient, the throttle is closed and thus the entire of the Pre-feed pump funded fuel is the pump elements available.
  • Control valve also the inflow of fuel into the High-pressure fuel pump for lubrication controls, so both Functions, namely the control of the throttle and the inflow to lubricate fuel into the high-pressure fuel pump with a valve can be done easily and inexpensively.
  • the Control valve is a cascade valve, and that the control valve the inflow of fuel into the high pressure fuel pump to Lubrication in several stages controls, so on the one hand it is ensured that the high-pressure fuel pump always is sufficiently lubricated and on the other hand is ensured sufficient for the pump elements at low speeds Fuel is available.
  • Throttle on the drain side with an opening into the tank Return line with the suction side of the pre-feed pump or with the lubrication of the high-pressure fuel pump is connected, so that regardless of the drain-side interconnection of the throttle the advantages of the invention can be used.
  • the pressure control valve a lock or a Control valve is and / or that a control unit to control the Fuel injection system is provided, so depending on the Control concept of fuel injection system the pressure in common rail is controllable by a blocking or a flow control valve.
  • the Pre-feed pump a gear pump by the High-pressure fuel pump or internal combustion engine is driven.
  • the speed and thus the capacity of the Pre-feed pump directly from the speed of the internal combustion engine depends on the pressure build-up on the suction side of the Pump elements when starting the engine relative slow, so the advantages of the invention High-pressure fuel pump or the invention Fuel injection system particularly advantageous for carrying come.
  • FIG. 1 shows a state-of-the-art common-rail injection system the technology shown schematically.
  • a prefeed pump 1 sucks via a supply line 3 fuel not shown a tank 5 at.
  • the fuel in a pre-filter. 7 and a filter with Water separator 9 filtered.
  • the prefeed pump 1 is designed as a gear pump and has a first pressure relief valve 11. Suction side becomes the prefeed pump throttled by a first throttle 13. A pressure side 15 of the prefeed pump 1 supplies a High-pressure fuel pump 17 with fuel.
  • the High-pressure fuel pump 17 is as a radial piston pump with executed three pump elements 19 and drives the Pre-feed pump 1 on.
  • On the suction side of the pump elements 19 is ever a suction valve 21 is provided.
  • the pump elements 19 are each a check valve 23rd provided, which prevents the under high pressure standing fuel, which of the pump elements 19 in a common rail 25 has been conveyed into the pump elements 19 can flow back.
  • the high pressure lines of the Fuel injection system are in Figs. 1 to 5 with drawn thick lines while under low pressure standing areas of the fuel injection system with thin lines are shown.
  • the common rail 25 supplies one or more in FIG. 1 not shown injectors with fuel over a High pressure line 27.
  • a switching valve 33 can in the return line 29th Fuel also in the supply line 3 of the Pre-feed pump 1 are transported, so that at low temperatures reduces the danger of scorching becomes.
  • the high-pressure fuel pump 17 is from the prefeed pump 1 on the one hand with fuel for the pump elements 19 and on the other hand supplied with fuel for lubrication.
  • the Amount of fuel used to lubricate the High-pressure fuel pump 17 is used, via a first Control valve 35 and a second throttle 37 controlled.
  • the pressure on the pressure side 15 of the Pre-feed pump 1 is not sufficient to a piston 39 of the first Control valve 35 against the spring force of a spring 41 to move.
  • the first control valve 35 is in Figure 1 shown closed.
  • the piston 39 moves against the Spring force of the spring 41 to the left and gives the line 43 free.
  • Via the line 43 and the second throttle 37 flows Fuel for lubrication of the high-pressure fuel pump 17 in their crankcase.
  • the high-pressure fuel pump 17 supplies via a Distribution line 45 and the pump elements 19 with Fuel.
  • a Metering valve 47 is provided to control the flow rate of the High-pressure fuel pump 17 is between the pressure side 15th the prefeed pump 1 and the distribution line 45 .
  • the metering valve 47 is a Flow control valve, which by a not shown Controlled control unit of the fuel injection system becomes.
  • the pump elements 19 are thus on the Metering valve 47 throttled on the suction side.
  • a third throttle 49 is provided, which is also referred to below as the zero-feed throttle.
  • the zero flow throttle 49 the fuel from the Distribution line 45 in the crankcase of Drain high-pressure fuel pump 17 and there for lubrication the high-pressure fuel pump 17 can be used.
  • the Outflow of fuel through the Nuil manufacture throttle 49 is the above-mentioned pressure build-up in the distribution line 45 at Sliding operation due to the leakage of the closed Metering valve 47 prevents.
  • a disadvantage of this solution is that the zero-feed throttle 49th always open, and thus especially at low speeds, as they are e.g. during commissioning of the internal combustion engine occur, the desired pressure build-up in the distribution line 45th by the outflow of fuel through the zero-feed throttle 49 is prevented.
  • FIGS. 2 to 5 show various embodiments of a fuel injection system according to the invention, wherein the same reference numerals are used for the same components and reference is made to the description of FIG.
  • the first control valve 35 is parallel to one of the System ventilation serving fourth throttle 53 switched so that with the beginning of the promotion of the feed pump 1 also Fuel for lubrication in the high-pressure fuel pump 17th arrives.
  • the zero-feed throttle 49 connects to this Embodiment, the distribution line 45 with the Return line 29.
  • the second control valve 45 has a piston 57, with the pressure of the pressure side of the feed pump. 1 is charged. If the pressure of the pressure side 15 is low, is a ball 59 by a spring 61 in a sealing seat 63rd pressed and thus closes the second control valve 55th Once the pressure on the pressure side 15 of the prefeed pump.
  • the control of Zero-feed throttle 49 integrated into the first control valve 35 is designed as a cascade valve, i.e. the fuel for lubrication of the high-pressure fuel pump 1 can at low pressure on the pressure side 15 of the Pre-feed pump 1 through the system ventilation serving fourth Throttle 53 in the crankcase of the high-pressure fuel pump 17th stream.
  • the pressure on the pressure side 15 of the Pre-feed pump 1 exceeds a first reference value opens the first control valve and outputs a fifth throttle 65, the is connected parallel to the fourth throttle 53, free.
  • Embodiment according to Figure 4 is the first Control valve 35 also designed as a cascade valve.
  • the Piston 39 of the first control valve 35 has an annular groove 69, which with reaching a first reference value on the Pressure side 15 of the feed pump 1 is such that the Zero-feed throttle 49 is connected to a drain line 71.
  • the drain line 71 opens into the supply line 3 of Pre-feed pump 1.
  • Fuel injection system is a diagram in FIG shown in which a flow 73 over a speed n is applied.
  • a first line 75 shows the flow rate of the Pre-feed pump 1 as a function of the speed n.
  • a second Line 77 shows the fuel demand of a High-pressure fuel pump 1 according to the prior art.
  • the technology essentially consists of the speed-dependent flow rate of the pump elements 19 and the differential pressure dependent volume flow through the Zero feed throttle 49 together.
  • At the intersection 79 between first line 75 and second line 75 is the starting speed of one with a fuel injection system according to the prior art equipped internal combustion engine achieved. In the present Example, the starting speed is 133 revolutions per Minute.
  • a third line 81 shows the fuel demand one with a Equipped according to the invention fuel injection system Internal combustion engine.
  • the speed-dependent fuel requirement 81 the high-pressure fuel pump 17 according to the invention depends only on the delivery of the pump elements 19 and is thus over the entire speed range below the fuel demand one Internal combustion engine according to the prior art (see second Line 77).
  • the intersection 83 is also between third line 81 and first line 75 at a lower Rpm reached.
  • the Start speed one with the inventive Fuel injection system equipped internal combustion engine 116 Revolutions per minute. That the internal combustion engine starts faster, the starter and the electrical system are less loaded and a start is also under less favorable environmental conditions still possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP01996683A 2000-11-18 2001-11-16 Kraftstoffeinspritzanlage für brennkraftmaschinen mit verbessertem startverhalten Expired - Lifetime EP1336043B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10057244 2000-11-18
DE10057244A DE10057244A1 (de) 2000-11-18 2000-11-18 Kraftstoffeinspritzanlage für Brennkraftmaschinen mit verbessertem Startverhalten
PCT/DE2001/004317 WO2002040857A2 (de) 2000-11-18 2001-11-16 Kraftstoffeinspritzanlage für brennkraftmaschinen mit verbessertem startverhalten

Publications (2)

Publication Number Publication Date
EP1336043A2 EP1336043A2 (de) 2003-08-20
EP1336043B1 true EP1336043B1 (de) 2005-02-09

Family

ID=7663786

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01996683A Expired - Lifetime EP1336043B1 (de) 2000-11-18 2001-11-16 Kraftstoffeinspritzanlage für brennkraftmaschinen mit verbessertem startverhalten

Country Status (6)

Country Link
US (1) US6772734B2 (ja)
EP (1) EP1336043B1 (ja)
JP (1) JP3999657B2 (ja)
KR (1) KR100793621B1 (ja)
DE (2) DE10057244A1 (ja)
WO (1) WO2002040857A2 (ja)

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EP1321663A3 (de) * 2001-12-19 2003-07-02 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10205187A1 (de) * 2002-02-08 2003-08-21 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
KR100539209B1 (ko) * 2002-08-29 2005-12-27 주식회사 두원정공 고압 서플라이 펌프
US6755625B2 (en) * 2002-10-07 2004-06-29 Robert H. Breeden Inlet throttle valve
DE10247564A1 (de) * 2002-10-11 2004-04-22 Robert Bosch Gmbh Verfahren zum Betreiben eines Common-Rail-Kraftstoffeinspritzsystems für Brennkraftmaschinen
US7273036B2 (en) 2002-10-31 2007-09-25 Robert Bosch Gmbh High-pressure fuel pump with a ball valve in the low-pressure inlet
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EP1712775A4 (en) * 2004-02-06 2010-01-20 Bosch Corp KRAFSTOFFZUFUHRVORRICHTUNG
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JP4672637B2 (ja) * 2006-11-02 2011-04-20 三菱重工業株式会社 エンジンの燃料噴射装置
DE102007000855B4 (de) * 2006-12-27 2020-06-10 Denso Corporation Kraftstofffördergerät und Speicherkraftstoffeinspritzsystem, das dieses aufweist
DE102007006945A1 (de) 2007-02-13 2008-08-14 Robert Bosch Gmbh Kraftstoffüberströmventil für eine Kraftstoffeinspritzeinrichtung und Kraftstoffeinspritzeinrichtung mit Kraftstoffüberströmventil
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DE102007052665A1 (de) 2007-11-05 2009-05-07 Robert Bosch Gmbh Kraftstoffüberströmventil für eine Kraftstoffeinspritzeinrichtung und Kraftstoffeinspritzeinrichtung mit Kraftstoffüberströmventil
DE102009028023A1 (de) * 2009-07-27 2011-02-03 Robert Bosch Gmbh Hochdruck-Einspritzsystem mit Kraftstoffkühlung aus Niederdruckbereich
DE102010001834A1 (de) 2010-02-11 2011-08-11 Robert Bosch GmbH, 70469 Verfahren zur Versorgung einer Hochdruckpumpe in einem Kraftstoffeinspritzsystem einer Brennkraftmaschine mit Kraftstoff sowie Kraftstoffeinspritzsystem
WO2012008892A1 (en) * 2010-07-14 2012-01-19 Volvo Lastvagnar Ab Fuel injection system with pressure-controlled bleed function
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KR20140057025A (ko) * 2012-11-02 2014-05-12 현대자동차주식회사 Lpg 직접 분사 시스템
GB2510846B (en) * 2013-02-14 2018-12-26 Ford Global Tech Llc A method of recuperating energy from a motor vehicle
GB201600768D0 (en) * 2016-01-15 2016-03-02 Delphi Internat Operations Luxembourg S À R L High pressure fuel pumps
DE102016212233B4 (de) * 2016-07-05 2021-09-23 Ford Global Technologies, Llc Direkteinspritzende aufgeladene Brennkraftmaschine mit Kraftstoffhochdruckpumpe

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Also Published As

Publication number Publication date
JP3999657B2 (ja) 2007-10-31
WO2002040857A2 (de) 2002-05-23
KR20020063005A (ko) 2002-07-31
DE50105329D1 (de) 2005-03-17
WO2002040857A3 (de) 2002-09-06
US20030089341A1 (en) 2003-05-15
US6772734B2 (en) 2004-08-10
EP1336043A2 (de) 2003-08-20
JP2004514087A (ja) 2004-05-13
DE10057244A1 (de) 2002-06-06
KR100793621B1 (ko) 2008-01-11

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