WO2012062508A2 - Fuel injection system of an internal combustion engine - Google Patents
Fuel injection system of an internal combustion engine Download PDFInfo
- Publication number
- WO2012062508A2 WO2012062508A2 PCT/EP2011/066410 EP2011066410W WO2012062508A2 WO 2012062508 A2 WO2012062508 A2 WO 2012062508A2 EP 2011066410 W EP2011066410 W EP 2011066410W WO 2012062508 A2 WO2012062508 A2 WO 2012062508A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- fuel
- line
- injection system
- fuel injection
- Prior art date
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 76
- 238000002347 injection Methods 0.000 title claims abstract description 25
- 239000007924 injection Substances 0.000 title claims abstract description 25
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 13
- 238000011144 upstream manufacturing Methods 0.000 abstract description 5
- 239000002245 particle Substances 0.000 description 7
- 239000000314 lubricant Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000009760 functional impairment Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
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
- 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
-
- 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
-
- 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
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
-
- 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
-
- 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
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
- F02M69/54—Arrangement of fuel pressure regulators
-
- 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
- F02M2200/27—Fuel-injection apparatus with filters
-
- 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
- F02M2200/28—Details of throttles in fuel-injection apparatus
-
- 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
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
-
- 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
- F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
Definitions
- the invention relates to a fuel injection system of an internal combustion engine, comprising a high-pressure fuel pump whose high-pressure region is preceded by a metering unit which delivers a fuel quantity delivered from a reservoir to the high-pressure region via a supply line, wherein a zero-feed line branches off from the supply line, which branches off in the area of a constriction of a Venturi throttle initiates a return.
- Fuel injection systems of modern diesel engines are predominantly designed today as common-rail injection systems.
- high pressure fuel is withdrawn through the individual fuel injectors from the cylinder from a pressure accumulator, which in turn is supplied via a high pressure area of a high pressure fuel pump with a corresponding amount of high pressure fuel.
- a high-pressure area of the high-pressure fuel pump is preceded by a metering unit which meters the fuel quantity required in the respective operating point of the diesel engine so that only the fuel quantity required is also compressed to high pressure and conveyed into the high-pressure accumulator. In certain operating states, however, the amount of fuel delivered into the high-pressure accumulator should be zero.
- such a fuel injection system of an internal combustion engine in which a metering unit is connected upstream of a high-pressure region of a high-pressure fuel pump. About this metering unit, the respective high-pressure area to be compressed and metered into a high-pressure accumulator fuel amount is metered.
- the metering unit is supplied via an upstream feed pump from a reservoir with low-pressure fuel, which is guided in advance to the metering unit via a filter unit.
- an overflow line with an overflow valve and a lubricant line with a lubricant throttle branch off from an inlet of the metering unit.
- a low-pressure region of the high-pressure fuel pump for lubrication and cooling is supplied with the low-pressure fuel.
- fuel can be delivered from a certain pressure level into a return of the fuel injection system to keep the pressure in front of the metering unit constant even at low delivery rates via the metering unit or in the case of zero delivery.
- a zero delivery line branching off from the supply line is furthermore provided, via which, in the case of zero delivery, the leakage quantity still flowing via the metering unit can be conveyed into the return line.
- larger pumpable in a working space of the pump fuel quantity is a junction of the zero feed line in the Return designed in the manner of a Venturi choke.
- the zero delivery line opens into the return line in the area of a narrow point of this venturi throttle.
- the present invention seeks to provide a fuel injection system of an internal combustion engine available, the susceptibility to failure in the region of the zero-delivery line is reduced.
- venturi restrictor in each case has a filter in an inlet and / or in an outlet section into the constriction.
- a filter in the inlet in front of the constriction of the Venturi throttle in an opening section into the constriction of the Venturi throttle or even in both areas, the risk of particle entry into the Venturi throttle can be significantly reduced.
- flow diameters of venturi throttles in this range are usually 0.1 mm to 2 mm, so that there settle particles and can lead to clogging of the return. This results in a functional impairment due to clogging of the return line.
- the provision of at least one fine mesh filter according to the invention significantly reduces the susceptibility due to a particle entry.
- each filter is a mesh screen.
- each filter is a laser-finished screen. In both cases, a fine-meshed filter can be designed with low production costs.
- a feed pump which promotes fuel from the reservoir into a low pressure region of the high pressure fuel pump and into an inlet of the metering unit.
- both the metering unit and the low-pressure region of the high-pressure fuel pump are supplied with sufficient fuel.
- an overflow line of an overflow valve branches off from the inlet of the metering unit.
- the overflow valve returns this excess amount from a first pressure level in the overflow line into a feed line of the feed pump and delivers from a second pressure level into the return line.
- a throttle point is provided between an opening of the return line and an inlet of the feed pump.
- the feed pump is a gear pump.
- Figure 1 is a schematic representation of the fuel injection system according to the invention according to a preferred embodiment of the invention.
- FIG. 2 shows a sectional view in the region of a venturi throttle of the fuel injection system according to FIG. 1.
- FIG. 1 shows a schematic view of the fuel injection system according to the invention of an internal combustion engine according to a preferred embodiment of the invention.
- a feed pump 1 which is preferably designed as a gear pump
- sucked fluid in the form of fuel from a reservoir 2 and conveyed to a high pressure fuel pump 3, which is composed of a low pressure region 4 and a high pressure region 5.
- the fuel passes through the - described here only as a black box - low pressure area 4 and is used for lubrication, as well as for cooling moving parts.
- the fuel passes to an inlet 6 of a metering unit 7, which meters the amount of fuel according to the demand demanded for operation of the internal combustion engine and via a feed line 8, and disposed therein suction valves 9 the - also not shown in detail - high-pressure region 5 supplies.
- the supplied fuel is then compressed in a manner known to those skilled in the art to high pressure and then one - only partially shown - accumulator 10 is supplied, from which the high-pressure fuel for operation of the internal combustion engine can be removed.
- an overflow line 1 1 branches off from the inlet 6 of the metering unit 7 with an overflow valve 12 arranged therein.
- This overflow valve 12 has a - here indicated by the drawing - piston, which from reaching a first pressure level in the overflow 1 1 a flow of fuel from the overflow line 1 1 in a return line 13 and from Reaching a second pressure level in the overflow 1 1 additionally allows flowing in a return line 14 to the reservoir 2.
- the piston of the overflow valve 12 is charged at the rear by a spring and the pressure prevailing in the return line 13, alternatively a rear loading by the spring and the pressure prevailing in the return 14 by a corresponding connection with the return 14 is conceivable ,
- the return line 13 opens into a feed line 15 of the feed pump 1, so that from reaching the first pressure level in the overflow 1 1 first, a return to the supply line 15 and further increasing pressure in the overflow 1 1 in addition to the return 14 to the reservoir. 2 he follows. To an increase of the pressure in the
- Overflow line 1 1 occurs here in that is conveyed by the feed pump 1, a nearly constant amount of fuel to the metering unit 7, but this only for the operation of the internal combustion engine necessary share for high-pressure area 5 passes.
- a throttle point 16 is provided between an opening of the return line 13 and an inlet of the feed pump 1.
- In the return 14 also opens a drain line 17 from the low pressure region 4 of the high-pressure fuel pump third
- a zero delivery line 18 branches off.
- Zero delivery line 18 is discharged in the case of operating conditions in which no high-pressure fuel production and, accordingly, no supply of fuel to the high-pressure region 5, a still occurring on the metering unit 7 and unavoidable leakage amount. Otherwise, this leakage would accumulate in the supply 8 and from a certain
- This zero feed line 18 opens into the return line 14, wherein the return line 14 in the region of this junction has a Venturi throttle 19, which is shown in detail in Figure 2. As can be seen from FIG. 2, the zero delivery line 18 opens in the region of a constriction 20 of the venturi throttle 19.
- the fuel injection system according to the invention now in each case a fine mesh filter 22 and 23 in an inlet 21 of the Venturi throttle 19 and in an opening portion in the constriction 20.
- These filters 22 and 23 can be designed in each case as a mesh screen or laser-sieve.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Filtering Materials (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201180053426.8A CN103201496B (en) | 2010-11-08 | 2011-09-21 | The fuel injection system of internal combustion engine |
RU2013126194/06A RU2013126194A (en) | 2010-11-08 | 2011-09-21 | FUEL INJECTION SYSTEM IN THE INTERNAL COMBUSTION ENGINE |
EP11760478.5A EP2638276B1 (en) | 2010-11-08 | 2011-09-21 | Fuel injection system of an internal combustion engine |
JP2013534230A JP5719444B2 (en) | 2010-11-08 | 2011-09-21 | Fuel injection system for internal combustion engine |
KR1020137011844A KR20130139985A (en) | 2010-11-08 | 2011-09-21 | Fuel injection system of an internal combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010043531.7 | 2010-11-08 | ||
DE102010043531A DE102010043531A1 (en) | 2010-11-08 | 2010-11-08 | Fuel injection system of an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2012062508A2 true WO2012062508A2 (en) | 2012-05-18 |
WO2012062508A3 WO2012062508A3 (en) | 2012-07-12 |
Family
ID=44674797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2011/066410 WO2012062508A2 (en) | 2010-11-08 | 2011-09-21 | Fuel injection system of an internal combustion engine |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP2638276B1 (en) |
JP (1) | JP5719444B2 (en) |
KR (1) | KR20130139985A (en) |
CN (1) | CN103201496B (en) |
DE (1) | DE102010043531A1 (en) |
RU (1) | RU2013126194A (en) |
WO (1) | WO2012062508A2 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013208707A1 (en) * | 2013-05-13 | 2014-11-13 | Robert Bosch Gmbh | Overflow valve for a high pressure pump in a fuel injection system |
DE102013226649A1 (en) * | 2013-12-19 | 2015-06-25 | Robert Bosch Gmbh | Fuel supply device of a fuel injection system of an internal combustion engine and overflow valve to it |
DE102015212121A1 (en) * | 2015-06-30 | 2017-01-05 | Robert Bosch Gmbh | Method for determining operating parameters of a fuel pump |
DE112017004546B4 (en) | 2016-09-09 | 2024-03-14 | Walbro Llc | THROTTLE BODY WITH FLUID FLOW CONTROL |
CN106640449B (en) * | 2016-12-27 | 2018-05-29 | 清华大学 | For the self-priming electronic control low-pressure fuel gauge of internal combustion engine |
CN108150324B (en) * | 2017-12-27 | 2020-01-03 | 潍柴动力股份有限公司 | High-pressure oil pump for engine fuel system and engine fuel system |
CN111878272B (en) * | 2020-06-30 | 2021-10-29 | 潍柴动力股份有限公司 | Exhaust device and exhaust method for high-pressure oil pump |
CN114017223B (en) * | 2021-11-03 | 2023-03-24 | 南岳电控(衡阳)工业技术股份有限公司 | Oil discharge structure and oil supply system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10154133C1 (en) | 2001-11-03 | 2003-02-13 | Bosch Gmbh Robert | Common-rail fuel system for IC engine has fuel fed from between fuel metering device and high pressure fuel pump fed to low pressure region with pressure reduction device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11257188A (en) * | 1998-03-10 | 1999-09-21 | Hitachi Ltd | Fuel return valve |
IT1310754B1 (en) * | 1999-11-30 | 2002-02-22 | Elasis Sistema Ricerca Fiat | VALVE SYSTEM FOR INLET PRESSURE CONTROL OF A LIQUID IN A HIGH PRESSURE PUMP, AND RELATED VALVE |
JP2007239684A (en) * | 2006-03-10 | 2007-09-20 | Bosch Corp | Fuel supply pump |
DE102009027335A1 (en) * | 2009-06-30 | 2011-01-05 | Robert Bosch Gmbh | Fuel system for an internal combustion engine |
-
2010
- 2010-11-08 DE DE102010043531A patent/DE102010043531A1/en not_active Withdrawn
-
2011
- 2011-09-21 RU RU2013126194/06A patent/RU2013126194A/en not_active Application Discontinuation
- 2011-09-21 EP EP11760478.5A patent/EP2638276B1/en active Active
- 2011-09-21 CN CN201180053426.8A patent/CN103201496B/en active Active
- 2011-09-21 JP JP2013534230A patent/JP5719444B2/en not_active Expired - Fee Related
- 2011-09-21 KR KR1020137011844A patent/KR20130139985A/en not_active Application Discontinuation
- 2011-09-21 WO PCT/EP2011/066410 patent/WO2012062508A2/en active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10154133C1 (en) | 2001-11-03 | 2003-02-13 | Bosch Gmbh Robert | Common-rail fuel system for IC engine has fuel fed from between fuel metering device and high pressure fuel pump fed to low pressure region with pressure reduction device |
Also Published As
Publication number | Publication date |
---|---|
JP2013545914A (en) | 2013-12-26 |
WO2012062508A3 (en) | 2012-07-12 |
KR20130139985A (en) | 2013-12-23 |
CN103201496B (en) | 2016-07-13 |
JP5719444B2 (en) | 2015-05-20 |
RU2013126194A (en) | 2014-12-20 |
EP2638276A2 (en) | 2013-09-18 |
EP2638276B1 (en) | 2016-08-17 |
DE102010043531A1 (en) | 2012-05-10 |
CN103201496A (en) | 2013-07-10 |
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