EP1776523A1 - Kraftstoffeinspritzsystem - Google Patents
KraftstoffeinspritzsystemInfo
- Publication number
- EP1776523A1 EP1776523A1 EP05754068A EP05754068A EP1776523A1 EP 1776523 A1 EP1776523 A1 EP 1776523A1 EP 05754068 A EP05754068 A EP 05754068A EP 05754068 A EP05754068 A EP 05754068A EP 1776523 A1 EP1776523 A1 EP 1776523A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- fuel
- valve
- injection system
- fuel injection
- 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
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
- 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
- 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
-
- 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
- F02M2200/60—Fuel-injection apparatus having means for facilitating the starting of engines, e.g. with valves or fuel passages for keeping residual pressure in common rails
Definitions
- the invention relates to a Kraftstoffeinspritzsys ⁇ system, in particular a common rail system, with a low-pressure region from which by means of a high-pressure fuel pump fuel pressurized high and is fed into a high-pressure fuel storage, are supplied from the injectors with fuel through the high-pressure fuel is injected into the combustion chamber of an internal combustion engine, the high-pressure pump, the high-pressure fuel accumulator and the injectors being associated with a high-pressure region.
- Conventional fuel injection systems may have leaks caused by construction.
- the injectors may have leaks. Due to the amount of leakage, a temperature-induced shrinkage of the fuel volume in the system can be compensated. When special fuel injection systems occur when starting the engine delays that are undesirable.
- the object of the invention is to provide a fuel injection system, in particular a common rail system, with a low-pressure region, from which fuel with high-pressure fuel is pumped by means of a high-pressure fuel pump.
- pressure is supplied and conveyed into a high-pressure fuel accumulator, from which injectors are supplied with fuel, by means of which the high-pressure fuel is injected into the combustion chamber of an internal combustion engine, the high-pressure pump, the high-pressure fuel accumulator and the injectors being assigned to a high-pressure region, to be created, can be avoided by the unwanted Ver ⁇ delays in starting the internal combustion engine.
- the object is in a fuel injection system, in particular a common rail system, with ei ⁇ nem low pressure range, from which by means of a high-pressure fuel pump fuel is pressurized with high and is fed into a Kraftstoffhoch horrspei ⁇ cher, supplied from the injectors with fuel be injected through which the high-pressure fuel is injected into the combustion chamber of an internal combustion engine, wherein the high-pressure pump, the high-pressure fuel storage and the injectors are associated with a high-pressure region, achieved by a scrubtschventil ⁇ device is connected between the low-pressure region and the high-pressure region that When a negative pressure formation in the high-pressure region, fuel from the low-pressure region reaches the high-pressure region.
- a preferred exemplary embodiment of the fuel injection system is characterized in that the non-return valve device has a high-pressure inlet, a high-pressure outlet and a low-pressure connection. Due to the design with two high-pressure connections and a low-pressure connection, the non-return valve device forms an adapter, which can be integrated into an existing fuel injection system without changing existing components.
- the adapter or the check valve device can be mounted in a housing of the high-pressure pump, in a line between the high-pressure pump and the high-pressure fuel accumulator or at an inlet of the high-pressure fuel accumulator.
- the adapter or the check valve device can also be provided at an outlet of the high-pressure fuel accumulator or in a high-pressure line between the high-pressure fuel accumulator and one of the injectors.
- the non-return valve comprises an adapter housing with a high-pressure through-hole which has an extended section at one end of the adapter housing, in which a valve bushing is arranged.
- the valve bushing preferably has a high-pressure passage hole, which is arranged in extension of the high-pressure passage hole formed in the adapter housing.
- a high-pressure connection is provided, for example for the high-pressure pump or the high-pressure fuel accumulator.
- a further high-pressure connection is provided, for example for the high-pressure fuel accumulator or an injector.
- a further preferred exemplary embodiment of the fuel injection system is characterized in that the valve bush has a blind hole in which a valve spring is arranged, through which a valve ball is pressed against one end of a low-pressure through-hole whose other end has the low-pressure connection.
- the shape and dimensions of the low-pressure passage hole and the valve ball are adjusted so that the valve ball closes the low-pressure passage hole at an end when it abuts against it.
- a further preferred embodiment of the fuel injection system is characterized gekennzeich ⁇ net, that in the valve sleeve, a connecting groove is attached, which closes the blind hole with the high pressure through hole connects.
- a further preferred exemplary embodiment of the fuel injection system is characterized in that the valve bushing has a through-hole extending in the radial direction, which communicates with the high-pressure through-hole and in which a valve sleeve is arranged, the opening to the low-pressure region and an opening having the high-pressure passage hole. Via the two openings of the valve sleeve, a connection is created between the low-pressure region and the high-pressure region.
- a further preferred exemplary embodiment of the fuel injection system is characterized in that a valve ball bears against the opening of the valve sleeve to the high-pressure passage hole.
- the shape and dimensions of the opening and the valve ball are adjusted so that the opening is closed when the valve ball rests against the ⁇ ff ⁇ voltage.
- a further preferred exemplary embodiment of the fuel injection system is characterized in that the valve ball is brought into contact with the opening of the valve sleeve by a valve spring. pressure through hole is held. If negative pressure occurs in the high-pressure through-hole, the pressure in the low-pressure region ensures that the valve ball lifts against the biasing force of the valve spring from the opening, so that fuel can flow from the low-pressure region into the high-pressure region.
- a further preferred embodiment of the fuel injection system is gekennzeich ⁇ net, that the valve spring and the valve ball are arranged in a protruding into the high-pressure passage hole ver ⁇ igmaigma portion of the valve sleeve, which is open to the high-pressure passage hole.
- the valve spring and valve ball can be preassembled in the valve sleeve. The pre-assembled valve sleeve then "only needs to be pressed into the valve sleeve.
- a further preferred exemplary embodiment of the fuel injection system is characterized in that the non-return valve device is integrated into an additional connection to the high-pressure fuel accumulator.
- the additional connection creates a connection to the low pressure area.
- a further preferred exemplary embodiment of the fuel injection system is characterized in that the low-pressure connection of the non-return valve device is connected to a return of the injectors.
- Figure 1 is a schematic representation of a fuel injection system
- Figure 2 is a schematic sectional view through a check valve device according to a first embodiment
- Figure 3 is a schematic sectional view through a check valve device according to a second embodiment
- Figure 4 is a schematic sectional view through a check valve device according to a third embodiment. Description of the embodiments
- a Coitunon rail fuel injection system is shown schematically.
- a low-pressure vessel 1 which is also referred to as a fuel tank
- fuel is conveyed to a high-pressure pump 4 by means of a fuel feed pump 2 via a connecting line 3.
- a connecting line 3 In the connecting line 3, an overflow valve 6 is arranged.
- the low-pressure container 1, the fuel feed pump 2 and the connecting line 3 are subjected to low pressure and are therefore assigned to the low-pressure region.
- a pressure control valve 8 is attached, which is connected via a line 9 to the Nieder ⁇ pressure vessel 1.
- the high-pressure pump 4 starts a high-pressure line 10, which delivers the high-pressure fuel to a high-pressure fuel accumulator 12, which is also referred to as a common rail.
- the high-pressure line 10, the high-pressure accumulator 12, the high-pressure line 14 and the injection valve 15 contain high-pressure fuel and are therefore assigned to the high-pressure region of the fuel injection system.
- the fuel injection valve 15 From the fuel injection valve 15 performs a return line, the two sections 16 and 17 auf ⁇ has, to the low-pressure vessel 1.
- a pressure-holding valve 18 is connected between the two sections 16 and 17 of the return line.
- the pressure-maintaining valve 18 serves to maintain a minimum pressure of approximately 10 bar in the section 16 of the return line, which makes it possible to fill a coupling space between the piezoactuator and a control valve element in the fuel injection valve 15, irrespective of the operating state of the fuel injection system.
- the operation of the fuel injection system is controlled by an electronic control unit 19.
- a pressure limiting valve 20 is provided, which is in communication with the return line.
- the pressure limiting valve 20 opens and the overpressure in the high-pressure fuel accumulator 12 is reduced to the low-pressure range.
- injectors can be used which, due to their structural design, have no leakage. As a result, the system is absolutely leak-tight at standstill. Now, if the temperature difference between stopping and restarting the engine is very large, then it comes due to the tightness of the high pressure area and the shrinkage of the therein be ⁇ sensitive fuel volume to an outgassing of the air dissolved in the fuel. The outgassed air leads to an unacceptable start time delay when restarting. In order to avoid the formation of a negative pressure in the high-pressure system, which entails an undesirable start-time delay, a defined connection between the high and low pressure regions is produced according to the present invention, without impairing the system efficiency during operation by leakage.
- a defined connection between the high-pressure and low-pressure regions is produced by means of a non-return valve device.
- FIG. 2 shows an exemplary embodiment of a non-return valve device according to the invention schematically in section.
- an additional An ⁇ connection piece 21 is welded to an Kraftstoff ⁇ high pressure accumulator 12.
- the connection piece 21 has a through-hole 22, which opens into the high-pressure fuel accumulator 12 and, after passing outwards, merges into a cylinder recess 24.
- a valve spring 25 is angeord ⁇ net, which is biased against a valve ball 26.
- the valve ball 26 is held by the valve spring 25 in sealing engagement with a funnel-shaped opening 27 of a connecting piece 28.
- the connecting piece 28 is connected to a low-pressure connecting line (not shown).
- the connecting piece 28 is mounted by means of a Kochsch ⁇ nut 29 to the connecting piece 21.
- valve ball 26 rests against the funnel-shaped opening 27 such that no high-pressure fuel passes from the high-pressure fuel accumulator 12 via the connecting piece 28 into the low-pressure region. If a negative pressure arises in the high-pressure fuel accumulator 12, then the valve ball 26 lifts off from the funnel-shaped opening 27, so that fuel from the low-pressure region passes through the connecting piece 28 and the through-hole 22 into the high-pressure fuel accumulator 12.
- the connecting piece 28 is preferably connected to the return of the injectors.
- FIG. 3 shows a sectional view of a check valve device according to a second exemplary embodiment.
- the non-return valve device is accommodated in an adapter housing 31, which essentially has the shape of a circular cylinder.
- an adapter housing 31 Provided in the adapter housing 31 is a central high-pressure through-hole, through which, as indicated by arrows, high-pressure fuel is conducted from a high-pressure inlet to a high-pressure outlet.
- the high-pressure pump or high-pressure fuel storage is connected to the high-pressure outlet.
- the high-pressure fuel storage or an injector ange ⁇ closed for example, the high-pressure fuel storage or an injector ange ⁇ closed.
- the central high-pressure passage 32 passes into an extended section 33 into which a valve bush 34 is pressed or screwed.
- the valve sleeve 34 has a central high-pressure passage hole 35, which is arranged in extension of the high-pressure passage hole 32.
- a blind hole 36 in which a valve spring 37 and a valve ball 38 are arranged is cut out in the end face of the valve bush 34 arranged in the adapter housing 31.
- the valve spring 37 is biased against the valve ball 38 in such a way that the valve ball 38 is held in abutment against one end of a low-pressure through-hole 39, which extends in the axial direction parallel to the high-pressure through-hole 32 through the adapter housing 31.
- a low-pressure connection 40 is provided at the end of the low-pressure through-hole 39 opposite the valve ball 38.
- the blind hole 36 in the valve sleeve 34 communicates with the high-pressure passage hole 32 via a radially extending valve groove 41 recessed in the valve sleeve 34.
- FIG. 4 shows a further embodiment of the check valve device according to the invention is shown in section.
- the non-return valve device is accommodated in an essentially circular-cylindrical adapter housing 44.
- the adapter housing 44 has a central high-pressure passage hole 45, at the ends of which in each case a high-pressure connection is arranged.
- the adapter housing 44 like the adapter housing 31 shown in FIG. 3, can be mounted on the housing of a high-pressure pump as well as in a line between the high-pressure pump and the high-pressure fuel accumulator at the entrance to the high-pressure fuel accumulator.
- the adapter housing can be mounted with appropriate adjustment of the cable length, as well as in a high-pressure line.
- the central high-pressure through-hole 45 merges at one end into an enlarged section 46, into which a valve bush 47 is pressed or screwed.
- the valve bushing 47 has a central high-pressure through-hole 48, which is arranged in extension of the high-pressure through-hole 45.
- the diameter 49 of the central high-pressure through-hole 48 is the same as the diameter of the central high-pressure through-hole 45.
- a radial through-hole 51 is provided in the valve bushing 47, which extends from the central high-pressure through-hole 48 and into an alignment with a radial through hole 50 is arranged in the adapter housing 44.
- a valve sleeve 52 is pressed, which essentially has the Ges ⁇ talt a circular cylinder jacket which is closed at its ends.
- One end of the valve sleeve 52 is arranged flush with the outer circumferential surface of the adapter housing 44.
- the other end of the valve sleeve 52 protrudes into the central Hochtik ⁇ through-hole 48.
- the valve sleeve 52 has an inner diameter 53 which is significantly smaller than the inner diameter 49 of the Hochtik gutgangs ⁇ hole 48.
- an extended Ab ⁇ section 55 is attached, which is perforated.
- a valve ball 57 and a valve spring 57 are arranged ange ⁇ .
- the valve ball 57 is held by the prestressed valve spring 56 in contact with an opening 58 in the valve sleeve 52.
- the valve sleeve 52 has an opening 61 which creates a connection between the interior of the valve sleeve 52 and a low-pressure passage hole 63 which extends in the axial direction parallel to the high-pressure passage hole 45 through the valve bushing 47 and the adapter housing 44.
- a low pressure port 65 is provided at the outer end of the low pressure passage hole 63.
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
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004037557A DE102004037557A1 (de) | 2004-08-03 | 2004-08-03 | Kraftstoffeinspritzsystem |
PCT/EP2005/052663 WO2006013128A1 (de) | 2004-08-03 | 2005-06-09 | Kraftstoffeinspritzsystem |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1776523A1 true EP1776523A1 (de) | 2007-04-25 |
EP1776523B1 EP1776523B1 (de) | 2008-11-19 |
Family
ID=34970927
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05754068A Expired - Fee Related EP1776523B1 (de) | 2004-08-03 | 2005-06-09 | Kraftstoffeinspritzsystem |
Country Status (6)
Country | Link |
---|---|
US (1) | US7438057B2 (de) |
EP (1) | EP1776523B1 (de) |
JP (1) | JP2008508470A (de) |
CN (1) | CN100578009C (de) |
DE (2) | DE102004037557A1 (de) |
WO (1) | WO2006013128A1 (de) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004027507A1 (de) * | 2004-06-04 | 2005-12-22 | Robert Bosch Gmbh | Kraftstoffeinspritzsystem |
DE102005033638A1 (de) * | 2005-07-19 | 2007-01-25 | Robert Bosch Gmbh | Kraftstoff-Fördereinrichtung, insbesondere für eine Brennkraftmaschine |
DE102006020692A1 (de) * | 2006-05-04 | 2007-11-08 | Robert Bosch Gmbh | Druckregelventil mit Notfahr- und Belüftungsfunktion |
DE102007056891A1 (de) * | 2007-11-26 | 2009-05-28 | Robert Bosch Gmbh | Kraftstoff-Hochdruckpumpe für ein Kraftstoffsystem einer Brennkraftmaschine |
DE102009027644A1 (de) | 2009-07-13 | 2011-01-20 | Robert Bosch Gmbh | Kraftstoffeinspritzsystem |
DE102009028023A1 (de) * | 2009-07-27 | 2011-02-03 | Robert Bosch Gmbh | Hochdruck-Einspritzsystem mit Kraftstoffkühlung aus Niederdruckbereich |
FR2949512A1 (fr) * | 2009-09-02 | 2011-03-04 | Renault Sa | Systeme et procede d'injection de carburant a rampe commune pour demarrage a froid |
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 |
DE102010027789A1 (de) * | 2010-04-15 | 2011-10-20 | Ford Global Technologies, Llc | Kraftstoffeinspritzsystem zum schnellen Druckaufbau bei erneutem Start des Verbrennungsmotors mit Stopp-Start-System |
FR2969216B1 (fr) * | 2010-12-20 | 2013-01-18 | Bosch Gmbh Robert | Soupape de limitation de pression et correction de depression d'accumulateur haute pression de carburant |
DE102010064115A1 (de) * | 2010-12-23 | 2012-06-28 | Robert Bosch Gmbh | Injektoranordnung, die vorzugsweise für Erdgas dient |
DE102011002697A1 (de) * | 2011-01-14 | 2012-07-19 | Robert Bosch Gmbh | Pumpe, insbesondere für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine |
DE102011089478B3 (de) | 2011-12-21 | 2013-06-27 | Continental Automotive Gmbh | Einspritzsystem |
DE102013208707A1 (de) * | 2013-05-13 | 2014-11-13 | Robert Bosch Gmbh | Überstromventil für eine Hochdruckpumpe in einem Kraftstoffeinspritzsystem |
DE102015210756A1 (de) * | 2015-06-12 | 2016-12-15 | Robert Bosch Gmbh | Gasinjektoranordnung, Betriebsverfahren für eine Gasinjektoranordnung und Brennkraftmaschine |
CN106401774A (zh) * | 2015-07-31 | 2017-02-15 | 罗伯特·博世有限公司 | 燃料喷射系统及操作该燃料喷射系统的方法 |
CN111433450B (zh) * | 2017-12-08 | 2022-01-28 | 沃尔沃卡车集团 | 用于共轨燃料喷射系统的装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2284024B (en) * | 1993-05-06 | 1997-04-02 | Cummins Engine Co Inc | Variable displacement high pressure pump for common rail fuel injection systems |
JP2001304067A (ja) | 2000-04-20 | 2001-10-31 | Bosch Automotive Systems Corp | 高圧燃料供給ポンプ |
JP2002004975A (ja) * | 2000-06-21 | 2002-01-09 | Toyota Motor Corp | 高圧燃料供給装置 |
US20040250795A1 (en) * | 2003-06-10 | 2004-12-16 | Visteon Global Technologies, Inc. | Managing fuel volume change in fuel rail |
DE10332484A1 (de) | 2003-07-17 | 2005-02-10 | Robert Bosch Gmbh | Kraftstoffeinspritzsystem für Verbrennungskraftmaschinen |
US6792918B1 (en) * | 2003-09-29 | 2004-09-21 | General Motors Corporation | Vacuum relief modular reservoir assembly |
US7066152B2 (en) * | 2004-09-03 | 2006-06-27 | Ford Motor Company | Low evaporative emission fuel system depressurization via solenoid valve |
-
2004
- 2004-08-03 DE DE102004037557A patent/DE102004037557A1/de not_active Withdrawn
-
2005
- 2005-06-09 US US11/659,356 patent/US7438057B2/en not_active Expired - Fee Related
- 2005-06-09 DE DE502005006014T patent/DE502005006014D1/de active Active
- 2005-06-09 WO PCT/EP2005/052663 patent/WO2006013128A1/de active Application Filing
- 2005-06-09 EP EP05754068A patent/EP1776523B1/de not_active Expired - Fee Related
- 2005-06-09 CN CN200580026263A patent/CN100578009C/zh not_active Expired - Fee Related
- 2005-06-09 JP JP2007524306A patent/JP2008508470A/ja active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO2006013128A1 * |
Also Published As
Publication number | Publication date |
---|---|
US7438057B2 (en) | 2008-10-21 |
EP1776523B1 (de) | 2008-11-19 |
CN100578009C (zh) | 2010-01-06 |
CN1993546A (zh) | 2007-07-04 |
US20080029065A1 (en) | 2008-02-07 |
JP2008508470A (ja) | 2008-03-21 |
WO2006013128A1 (de) | 2006-02-09 |
DE102004037557A1 (de) | 2006-03-16 |
DE502005006014D1 (de) | 2009-01-02 |
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