EP2622204A1 - Fuel injection system - Google Patents
Fuel injection systemInfo
- Publication number
- EP2622204A1 EP2622204A1 EP11754353.8A EP11754353A EP2622204A1 EP 2622204 A1 EP2622204 A1 EP 2622204A1 EP 11754353 A EP11754353 A EP 11754353A EP 2622204 A1 EP2622204 A1 EP 2622204A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- pressure
- pump
- 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.)
- Withdrawn
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
- 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
- F02M59/447—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 means specially adapted to limit fuel delivery or to supply excess of fuel temporarily, e.g. for starting of the engine
-
- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
- F02M37/0023—Valves in the fuel supply and return system
- F02M37/0029—Pressure regulator in the low pressure fuel system
-
- 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
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0028—Valves characterised by the valve actuating means hydraulic
-
- 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
- F02M63/0056—Throttling valves, e.g. having variable opening positions throttling the flow
-
- 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
Definitions
- Fuel injection system The present invention relates to a fuel injection system for an internal combustion engine, in particular a common rail injection system, according to the preamble of claim 1.
- high-pressure injection systems eg.
- common rail systems which have a high-pressure pump for providing fuel under high pressure to a fuel storage, wherein a mechanical or electric prefeed pump promotes the fuel from a fuel tank to the high-pressure pump.
- different conveying pump concepts are used for conveying fuel to the high-pressure pump, for example, inside or outside conveying gear pumps and vane pumps.
- the different fuel delivery pumps used have by the pump geometry fixed predetermined delivery volumes, which are still limited, for example, by suction side mounted chokes in the maximum amount.
- DE 2005 052 636 A1 discloses a fuel system which comprises a feed pump which delivers fuel from a fuel tank. From the feed pump, the fuel passes via a metering unit to a high-pressure pump which compresses the fuel and supplies it to a high-pressure accumulator. To the high-pressure accumulator several fuel injectors are connected. The pressure in the high-pressure accumulator is set, inter alia, by means of a pressure control valve (shut-off valve). The fuel discharged from the high pressure accumulator is returned to a fuel tank.
- a pressure control valve shut-off valve
- a fuel injection system for an internal combustion engine, in particular a common rail injection system, which has a mechanical fuel pump which supplies a high pressure pump via a low pressure line with fuel, the high pressure pump with high pressure fuel supplied via a high pressure line to a high pressure accumulator, wherein the flow rate of Fuel pump is controlled by a pressure control.
- a mechanical fuel pump which supplies a high pressure pump via a low pressure line with fuel
- the high pressure pump with high pressure fuel supplied via a high pressure line to a high pressure accumulator
- the flow rate of Fuel pump is controlled by a pressure control.
- a winning guesser- direction is provided, which is integrated in the fuel pump.
- a delivery amount limiting device is provided upstream or downstream of the fuel delivery pump.
- the pressure control is carried out via a high pressure relief.
- the pressure control can also be done via a low pressure control.
- a pressure control valve is provided on the high-pressure accumulator, wherein a Abêtmengeabhfitge pressure regulator is dammed at a throttle, wherein a Abêtmengenabhfiti- ger pressure increase acts on an effective surface, which counteracts a return spring, and wherein the effective surface on the winningmengenverstell responded the fuel pump or the flow rate limiting device acts.
- a damping device is arranged parallel to the return spring.
- the damping device can serve to advantageously adapt the dynamics of the structure to the requirements.
- a metering unit is provided for metering an amount of fuel to the high-pressure pump.
- the fuel delivery pump is adjustable, in particular a vane pump, gerotor pump or piston or diaphragm pump, or is a non-adjustable fuel delivery pump.
- a vane pump since there the flow rate by displacement or rotation of the outer ring to reduce the eccentricity and thus to reduce the flow rate is very easy to represent. If, however, for example, a gerotor pump is used, in which the direction of the eccentricity of the outer red is rotated, here also reduces the displaced volume.
- a non-adjustable fuel delivery pump this may be, for example, an externally conveying gear pump, a non-adjustable gerotor and vane pump, etc., whose flow rate is limited by an adjustable upstream throttle device.
- the implementation of this embodiment is very simple and inexpensive.
- a downstream valve to return the excess fuel with the lowest possible pressure level to the suction side of the pump. The actual adjustment of the delivery rate of the fuel delivery pump or the downstream feedback is made in each case by the pressure control according to the invention.
- Fig. 1 is a fuel injection system according to the prior art
- FIG. 2 shows a fuel injection system according to an embodiment
- FIGS. 4A-4D each schematically illustrate a portion of a low-pressure pump circuit according to an embodiment.
- Fig. 1 shows a fuel injection system 1 according to the prior art, which for supplying an internal combustion engine 2, which is indicated in Fig. 1, however, only schematically indicated by a dashed line.
- the fuel injection system 1 comprises a fuel tank 3, from which an electrically driven fuel delivery pump 4 conveys the fuel into a low-pressure line 5, which leads to a metering unit 6. Downstream of the metering unit 6, the low-pressure line 5 leads to a high-pressure pump 7 which is mechanically driven by the engine 2. This compresses the fuel to a very high pressure and conveys it via a high-pressure line 8 into a high-pressure accumulator 9, which is also referred to as a "rail".
- a shut-off valve 1 1 is connected, of which a
- a throttle 13 is arranged in the diversion line 12.
- a portion of the spill line 12 located upstream of the throttle 13 is denoted by 12a, and a portion located downstream of the throttle 13 by 12b.
- the upstream of the throttle 13 located portion 12a of the diversion line 12 is connected by means of a dashed hydraulic control line 14 with the metering unit 6.
- a control line 15 also connects the region 12b of the diversion line 12 located downstream of the throttle 13 with the metering unit 6.
- FIG. 2 shows a fuel injection system 1 according to an embodiment implementing a high pressure dump.
- fuel is supplied from the fuel tank 3 of the high-pressure pump 7 of the fuel pump 4, which is designed here as a mechanically driven vane pump, which then supplies the high-pressure fuel to the high-pressure accumulator 9 through which the injectors 10 supplies fuel become.
- a pressure regulating valve 18 and a throttle 13 are arranged downstream of the high-pressure accumulator 9, a pressure regulating valve 18 and a throttle 13 are arranged. If a target pressure is reached in the high-pressure accumulator 9, the pressure regulating valve 18 opens, so that a certain amount of fuel is shut off.
- the Abticianmenge of the pressure control valve 18 is dammed up at the throttle 13, which acts to a Abêtmengenparen pressure increase on an active surface, which counteracts a return spring 19.
- This active surface acts on an adjusting device of the fuel delivery pump 4, which adjusts or reduces the fuel delivery amount accordingly.
- the fuel delivery of the fuel delivery pump 4 In the rest position, ie when no or only a minimal back pressure in the Ab Kunststofftechnisch 12 from the high-pressure accumulator 9 acts, the fuel delivery of the fuel delivery pump 4, however, is maximum.
- the fuel delivery pump 4 has a damping device 23 in order to adapt the dynamics of the structure to the requirements.
- the throttle 13 can either be arranged parallel to the fuel feed pump 4, as shown here in the figure, or it can alternatively be integrated directly into the fuel feed pump 4.
- the advantage of the parallel arrangement shown here is a lower temperature load on the fuel feed pump 4.
- FIG. 3 shows a fuel injection system 1 according to another embodiment, which implements a low pressure relief.
- a modified version of a metering unit 6 ZME / MPROP is used instead of the Abêtmenge of the pressure control valve 18 used there at the high-pressure accumulator 9.
- the fuel to be compressed is divided by a proportional valve in the metering unit 6 between the output to the high-pressure pump 7 and a return line 20.
- FIGS. 4A to 4D respectively schematically show a section of a pump low-pressure circuit according to an embodiment, wherein in FIG.
- a throttle 13 is arranged upstream of the engine 21 of a high-pressure pump 7 in front of a branch 23 to a suction valve 22 of the high-pressure pump 7.
- the embodiment shown in FIG. 4B differs from that shown in FIG. 4A in that the throttle 13 is arranged here downstream of the engine. 4C, a pressure regulating valve 18 is disposed between the engine 21 and the suction valve 22, whereas in the embodiment shown in FIG. 4D, the engine 21 and the suction valve 22 are arranged parallel to each other and the pressure regulating valve 18 is disposed downstream of the engine 21 , All four embodiments operate according to the principle described above in connection with FIGS. 2 and 3. Furthermore, all four Embodiments not equipped with a metering unit 6.
- a fuel injection system 1 is provided by the configuration according to the invention, in which the fuel delivery amount of a mechanical fuel delivery pump 4 in a simple and effective manner is adjustable according to the respective needs.
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 |
---|---|---|---|
DE201010041487 DE102010041487A1 (en) | 2010-09-27 | 2010-09-27 | Fuel injection system |
PCT/EP2011/065075 WO2012041628A1 (en) | 2010-09-27 | 2011-09-01 | Fuel injection system |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2622204A1 true EP2622204A1 (en) | 2013-08-07 |
Family
ID=44583006
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11754353.8A Withdrawn EP2622204A1 (en) | 2010-09-27 | 2011-09-01 | Fuel injection system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2622204A1 (en) |
CN (1) | CN103228904B (en) |
DE (1) | DE102010041487A1 (en) |
WO (1) | WO2012041628A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103835813A (en) * | 2014-03-10 | 2014-06-04 | 大连理工大学 | Control method for composite fuel injection system |
CN112469898A (en) | 2018-05-07 | 2021-03-09 | 玫海伟尔特股份有限公司 | Pulsation damping system |
CN116412051A (en) * | 2023-04-17 | 2023-07-11 | 中国舰船研究设计中心 | Pressure fluctuation elimination system for outlet of engine belt fuel pump of diesel engine |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10318941A1 (en) * | 2003-04-26 | 2004-11-11 | Robert Bosch Gmbh | Fuel system for internal combustion engine has choke device whose choke effect can be varied arranged between first fuel pump with variable delivery rate and second fuel pump feeding storage device |
JPWO2005075813A1 (en) * | 2004-02-06 | 2007-08-02 | ボッシュ株式会社 | Fuel supply device |
DE102005052636A1 (en) | 2005-11-04 | 2007-05-10 | Robert Bosch Gmbh | Fuel system of an internal combustion engine |
EP2037117B1 (en) * | 2007-09-11 | 2010-02-10 | C.R.F. Società Consortile per Azioni | Fuel injection system comprising a variable flow rate high-pressure pump |
US7640919B1 (en) * | 2008-01-31 | 2010-01-05 | Perkins Engines Company Limited | Fuel system for protecting a fuel filter |
-
2010
- 2010-09-27 DE DE201010041487 patent/DE102010041487A1/en not_active Withdrawn
-
2011
- 2011-09-01 CN CN201180056584.9A patent/CN103228904B/en not_active Expired - Fee Related
- 2011-09-01 EP EP11754353.8A patent/EP2622204A1/en not_active Withdrawn
- 2011-09-01 WO PCT/EP2011/065075 patent/WO2012041628A1/en active Application Filing
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2012041628A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102010041487A1 (en) | 2012-03-29 |
CN103228904B (en) | 2016-01-27 |
WO2012041628A1 (en) | 2012-04-05 |
CN103228904A (en) | 2013-07-31 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 20130429 |
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DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20171107 |
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GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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INTG | Intention to grant announced |
Effective date: 20200224 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: ROBERT BOSCH GMBH |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20200707 |