EP1254311B1 - Kraftstoffversorgungssystem für brennkraftmaschinen mit verbesserter befüllung der kraftstoffleitung - Google Patents

Kraftstoffversorgungssystem für brennkraftmaschinen mit verbesserter befüllung der kraftstoffleitung Download PDF

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Publication number
EP1254311B1
EP1254311B1 EP01919120A EP01919120A EP1254311B1 EP 1254311 B1 EP1254311 B1 EP 1254311B1 EP 01919120 A EP01919120 A EP 01919120A EP 01919120 A EP01919120 A EP 01919120A EP 1254311 B1 EP1254311 B1 EP 1254311B1
Authority
EP
European Patent Office
Prior art keywords
fuel
filling
line
supply system
surge pot
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
EP01919120A
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German (de)
English (en)
French (fr)
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EP1254311A1 (de
Inventor
Peter Schueler
Thomas Droege
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
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1254311A1 publication Critical patent/EP1254311A1/de
Application granted granted Critical
Publication of EP1254311B1 publication Critical patent/EP1254311B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F02M37/02—Feeding by means of suction apparatus, e.g. by air flow through carburettors
    • F02M37/025—Feeding by means of a liquid fuel-driven jet pump

Definitions

  • the invention relates to a fuel supply system for internal combustion engines with a fuel tank and a swirl pot and means for filling the swirl pot with fuel from the fuel tank and with a swirl pot with the engine hydraulically connecting fuel line, the means for filling the swirl pot temporarily in the Promote fuel line, and arranged with a means disposed between the means for filling the swirl pot and the fuel line directional control valve.
  • the purpose of the swirl pot is to ensure that the fuel line which projects into the fuel supply system draws in fuel and not air as long as possible. This is of particular importance when the tank is almost empty, and / or when the vehicle is high lateral accelerations is exposed so that the contents of the fuel tank is pushed to the side.
  • This effect is achieved in that the swirl pot has a relatively small footprint and a height corresponding approximately to the overall height of the fuel tank, so that only a relatively small volume of fuel is required to fill the swirl pot.
  • This volume of fuel is delivered into the baffle through one or more fuel pumps that draw at the one or more low points of the fuel tank.
  • the fuel supply is via a fuel line that sucks in a fuel supply system.
  • the fuel is conveyed by a directly coupled to the internal combustion engine fuel pump.
  • the delivery rate of the fuel delivery pump is very low.
  • the fuel delivery pump does not suck or only to a small extent fuel from the fuel supply system, which adversely affects the starting behavior of the internal combustion engine.
  • starter and starter battery are heavily loaded. This operating behavior is particularly problematic when the fuel tank has been emptied when first filling the fuel tank Motor vehicle with fuel in the factory or at low ambient temperatures when the performance of the starter battery is reduced.
  • a fuel supply system in which a 3/2-way valve is provided that produces a hydraulic connection between the means for filling the swirl pot and the fuel line in a first switching position. As soon as a certain flow rate is exceeded, the 3/2-way valve also releases a connection to a suction jet pump.
  • the invention has for its object to provide a fuel supply system for internal combustion engines, which further improves the starting behavior of the internal combustion engine even under unfavorable circumstances and thus contributes to the discharge of the starter battery and the starter.
  • a fuel supply system for internal combustion engines with a fuel tank and a swirl pot arranged therein, with means for filling the swirl pot with fuel from the fuel tank with a, the swirl pot with the internal combustion engine hydraulically connecting, fuel line, wherein the means for filling the swirl pot at least temporarily Promote fuel into the fuel line, and arranged with a disposed between the means for filling the baffle and the fuel line directional valve, solved in that the directional control valve is designed as a 3/3-way valve, that the 3/3-way valve in its first switching position, the means for filling the swirl pot with the fuel line connects that the 3/3-way valve in its second switching position, the means for filling the swirl pot with the fuel line and the one or more jet pumps connects, and that the 3/3-way valve in its third switching position connects the means for filling the swirl pot with the jet or the jet pumps.
  • the rapid filling of the fuel line is ensured by the fuel pump;
  • the jet pumps in the fuel tank are already driven upon reaching the second switching position, so that a drop in the fuel level is prevented in the swirl pot.
  • the inventive 3/3-way valve Only when the internal combustion engine itself draws in enough fuel and the inventive 3/3-way valve is in its third switching position, promote the means for filling the swirl pot exclusively to the jet pumps, so that their flow rate can be minimized. This results in cost advantages in the production and a reduction in energy consumption during operation.
  • the third shift position In the third shift position
  • the aforementioned object is inventively also in a fuel supply system for internal combustion engines with a fuel tank and a swirl pot disposed therein, with means for filling the swirl pot with fuel from the fuel tank and with a swirl pot with the engine hydraulically connecting fuel line, the means for filling the Swirl pot at least temporarily promote fuel in the fuel line and between the means for filling the swirl pot and the fuel line, a 3/2-way valve is present, achieved in that the 3/2-way valve in its first switching position, the means for filling the swirl pot with the Fuel line connects, and that the 3/2-way valve connects in its second switching position, the means for filling the swirl pot exclusively with at least one jet pump.
  • a throttle is present between the means for filling the swirl pot and the fuel line, so that a defined distribution of the funded by the fuel pump fuel flow to the jet pumps and the fuel line is made possible.
  • the 2/3-way valve or the 3/3-way valve is spring loaded in its first switching position is brought and that the 2/3-way valve or the 3/3-way valve against a spring force using Fuel is moved from the means for filling the swirl pot in the second and possibly third switching position.
  • the fuel delivered by the fuel pump actuates the directional control valves, they reach the second and possibly the third switching position after a certain time, depending on the pressure level of the fuel pumped by the fuel pump, the spring force and any throttle present. This ensures that the jet pumps are driven by the fuel pump a short time after the start of fuel delivery and thus also the swirl pot is filled.
  • the level of the swirl pot independent of the means for filling the swirl pot at least on the level of the tank, so that the fuel line and the fuel pump never suck air and on the other hand, a continuous operation of the fuel pump is avoidable.
  • the fuel pump can be designed for a shorter service life, which contributes to cost savings and to reducing the need for drive energy for the fuel pump.
  • the means for filling the swirl pot comprise an electric fuel pump, so that the means for filling the swirl pot are inexpensive and can be controlled easily.
  • the fuel pump drives at least one jet pump arranged in the vicinity of or of the low points of the fuel tank and that the jet pump or the jet pumps feed fuel into the surge pot promote so that the entire fuel in the fuel tank is easily promoted in the swirl pot.
  • the fuel line to a check valve, so that idling of the fuel line is avoided during the stoppage of the internal combustion engine.
  • FIG. 1 shows a first embodiment of a fuel supply system according to the invention with a pressure-holding valve in a schematic representation.
  • a fuel tank 1 the upper half of which is not shown in FIG. 1, has two low points 3 in the installed position.
  • a swirl pot 5 is arranged, which is open at the top.
  • the internal combustion engine not shown, or its associated fuel delivery pump promotes through a projecting into the baffle 5 fuel line 7 fuel from the swirl pot 5 to the engine.
  • a first check valve 9 is provided at the end thereof.
  • the swirl pot 5 has the task, even at a low fuel level in the fuel tank 1 to ensure that fuel is sucked through the fuel line 7 as long as possible and not air.
  • the swirl pot 5 has compared to the base of the tank 1 a lot smaller base, and its wall has approximately the height of the fuel tank 1. This makes it possible to achieve a high level in the swirl pot 5 with a small amount of fuel and thus to ensure that the fuel line 7 sucks fuel as long as possible.
  • the filling of the swirl pot 5 is carried out with means for filling the swirl pot.
  • These means essentially consist of a fuel pump 11 and a respective jet pump 13 in each low point 3 of the fuel tank 1.
  • One of the jet pumps 13 feeds fuel into the lower area of the swirl pot 5 and has a second check valve 15 which prevents fuel from the swirl pot 5 can flow back into the tank 1.
  • the swirl pot 5 is filled via the check valve 15, whereby the level in the swirl pot 5 is at least approximated to that in the fuel tank 1.
  • the other jet pump 13 conveys over the upper edge of the swirl pot 5 in this, so that no check valve is required.
  • the fuel tank 1 opens a fuel return 17, which dissipates excess fuel into the fuel tank 1.
  • the fuel pump 11 sucks fuel via a pre-filter 19 from the swirl pot 5 and promotes it via supply lines 21 to the jet pumps 13 and via a connecting line 23 in the fuel line 7.
  • an overflow valve 25 is provided, which is dimensioned such that it only opens when the required working pressure of the jet pumps 13 has been reached.
  • Connecting line 23 is conveyed into the fuel line 7.
  • the first check valve 9 in the fuel line 7 also prevents the fuel from the connecting line 23 again enters the swirl pot 5. This arrangement ensures that within a very short time the fuel line 7 is filled with fuel and thus a starting of the internal combustion engine is made possible.
  • Fig. 7 the characteristic of this embodiment of the invention is shown in a diagram.
  • the pressure difference is plotted in bar, while the ordinate 29 indicates the flow rate in liters per hour.
  • the characteristic of the first embodiment is provided with the mark 31. It follows that only when reaching a pressure difference of 0.3 bar, the overflow valve 25 opens and the flow, starting at zero, increases linearly with increasing pressure difference.
  • a second embodiment of a fuel supply system according to the invention is shown, which has a throttle 33 in the connecting line 23 instead of a pressure-holding valve.
  • the characteristics 35 and 37 are entered for two different throttle cross-sections. It follows that even with a very small pressure difference already a promotion of fuel takes place in the connecting line 27, so that the filling of the fuel line 7 is faster. Under unfavorable circumstances, the pressure, which occurs on the pressure side of the fuel pump 11, may be too low to ensure the function of the jet pumps 13.
  • a throttle 33 is combined with a third check valve 39.
  • the characteristic 41 of the check valve 39 is shown. From this representation, it can be seen that with reaching a certain pressure difference, here about 0.16 bar, the third check valve 39 opens and increases with increasing pressure difference of the flow very much.
  • the combination of the characteristics of the third check valve 39 and the throttle 33 is shown in FIG. 7 as a characteristic curve 43. From this characteristic it follows that in this embodiment, only a certain pressure difference is built up before a delivery of fuel from the feed pump 11 takes place in the fuel line 7.
  • FIGS. 4, 5 and 6 show a fourth exemplary embodiment in various operating states.
  • the fuel line 7 has a fuel filter 45 and a fuel feed pump 47.
  • the control of the the fuel pump 11 funded from the swirl pot 5 fuel is carried by a 3/3-way valve 49, which is shown in a first switching position.
  • the 3/3-way valve 49 has a first port 51, which connects the fuel pump 11 with the 3/3-way valve 49.
  • a second port of the 3/3-way valve 49 is connected to the connection line 23, while the third connection is connected to the supply line 21.
  • the 3/3-way valve has a piston 53.
  • This piston 53 has a connecting bore with throttle 55, which connects a first space 57 of the 3/3-way valve 49 with a second space 59.
  • a spring 63 is arranged, which always brings the 3/3-way valve in the first switching position shown in Fig. 4, when the fuel pump 11 is out of operation.
  • the fuel pump 11 When the fuel pump 11 is put into operation, it promotes in the first space 57 of the 3/3-way valve. Since the connecting line 23 communicates with the first space 57 in this switching position, the fuel pump 11 conveys into the fuel line 7. A portion of the delivery flow of the fuel pump 11 passes through the connecting bore with throttle 55 in the piston 53 into the second space 59 and leads to it in that the piston 53 moves in the direction of the spring 63 against the force of the spring 63.
  • Fig. 5 the fourth embodiment is shown in a second switching position.
  • the piston 53 is positioned so that the space 57 communicates hydraulically with both the connection line 23 and the supply line 21. In this position, both the fuel line 7 and the jet pumps 13 are supplied by the fuel pump 11 with fuel.
  • Fig. 6 the third switching position of the 3/3-way valve 49 is shown. In this switching position, the fuel pump 11 promotes exclusively in the supply line 21 and not in the connecting line 23. That is: the entire flow of the power flow pump 11 is the jet pump 13 benefit.
  • the fuel line 7 is filled as quickly as possible and at the same time the jet pumps 13 are driven as soon as possible.
  • this leads to a very good starting behavior of the internal combustion engine, not shown, and it is possible to dimension fuel pump 11 small, since it has to provide only the jet pumps 13 in continuous operation.
  • a throttle 65 may be provided, which results in that the fuel flow in the connecting line 23 is reduced and thus a larger part of the funded by the fuel pump 11 fuel flow through the connecting hole 55 into the second space 59 flows. As a result, the speed at which the piston 53 moves from the first to the third shift position is increased.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
EP01919120A 2000-01-28 2001-01-26 Kraftstoffversorgungssystem für brennkraftmaschinen mit verbesserter befüllung der kraftstoffleitung Expired - Lifetime EP1254311B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10003748A DE10003748A1 (de) 2000-01-28 2000-01-28 Kraftstoffversorgungssystem für Brennkraftmaschinen mit verbesserter Befüllung der Kraftstoffleitung
DE10003748 2000-01-28
PCT/DE2001/000312 WO2001055582A1 (de) 2000-01-28 2001-01-26 Kraftstoffversorgungssystem für brennkraftmaschinen mit verbesserter befüllung der kraftstoffleitung

Publications (2)

Publication Number Publication Date
EP1254311A1 EP1254311A1 (de) 2002-11-06
EP1254311B1 true EP1254311B1 (de) 2006-09-13

Family

ID=7629063

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01919120A Expired - Lifetime EP1254311B1 (de) 2000-01-28 2001-01-26 Kraftstoffversorgungssystem für brennkraftmaschinen mit verbesserter befüllung der kraftstoffleitung

Country Status (6)

Country Link
US (1) US6997168B2 (ja)
EP (1) EP1254311B1 (ja)
JP (1) JP4488156B2 (ja)
DE (2) DE10003748A1 (ja)
ES (1) ES2272454T3 (ja)
WO (1) WO2001055582A1 (ja)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10143819B4 (de) 2001-09-06 2005-12-01 Siemens Ag Kraftstoffmodul
US6981490B2 (en) * 2003-03-13 2006-01-03 Denso Corporation Fuel feed apparatus having sub tank and jet pump
DE10335698A1 (de) * 2003-08-05 2005-02-24 Bayerische Motoren Werke Ag Kraftstoffversorgungsanlage einer Brennkraftmaschine sowie Betriebsverfahren hierfür
DE10342081B4 (de) * 2003-09-10 2006-08-10 Siemens Ag Kraftstoffbehälter für ein Kraftfahrzeug
US6792918B1 (en) * 2003-09-29 2004-09-21 General Motors Corporation Vacuum relief modular reservoir assembly
DE102004007878A1 (de) * 2004-02-18 2005-09-15 Ti Automotive (Neuss) Gmbh Kraftstoffversorgungssystem und Verfahren zur Regelung der Kraftstoffversorgung
DE102004021919A1 (de) * 2004-05-04 2005-12-01 Robert Bosch Gmbh Vorrichtung zum Fördern von Kraftstoff aus einem Vorratsbehälter zu einer Brennkraftmaschine
DE102005008380A1 (de) * 2005-02-23 2006-08-31 Siemens Ag Kraftstoffversorgungseinrichtung für ein Kraftfahrzeug
FR2890341B1 (fr) * 2005-09-02 2008-10-24 Inergy Automotive Systems Res Systeme a carburant comprenant une reserve a carburant et un bac de retention
US7216633B2 (en) * 2005-09-21 2007-05-15 Denso International America, Inc. Transfer jet pump prime reservoir with integrated anti-siphon valve feature
FR2927321B1 (fr) * 2008-02-08 2010-03-19 Gaztransp Et Technigaz Dispositif pour l'alimentation en combustible d'une installation de production d'energie d'un navire.
JP5261238B2 (ja) 2009-03-19 2013-08-14 富士重工業株式会社 エンジンの燃料供給装置
DE102009002299A1 (de) 2009-04-09 2010-10-14 Robert Bosch Gmbh Vorrichtung zum Fördern von Kraftstoff
DE102016200232A1 (de) * 2016-01-12 2017-07-13 Continental Automotive Gmbh Kraftstoffeinspritzsystem
FR3056258A1 (fr) * 2016-09-22 2018-03-23 Peugeot Citroen Automobiles Sa Systeme d’alimentation en carburant
DE102017207106B4 (de) * 2017-04-27 2022-06-15 Vitesco Technologies GmbH Kraftstofffördersystem zur Verwendung in einem Fahrzeug

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4860714A (en) * 1986-08-20 1989-08-29 Whitehead Engineered Products, Inc. In-tank fuel pump assembly for fuel-injected engines
SE9001541L (sv) * 1990-04-27 1991-10-28 Saab Automobile Braenslesystem till en foerbraenningsmotor
DE4426946B4 (de) * 1994-07-29 2004-04-08 Robert Bosch Gmbh Vorrichtung zum Fördern von Kraftstoff aus einem Vorratsbehälter zur Brennkraftmaschine eines Kraftfahrzeugs
DE19540892A1 (de) * 1995-11-02 1997-05-07 Bayerische Motoren Werke Ag Kraftstoffanlage
DE19628580A1 (de) * 1996-07-16 1998-01-22 Mannesmann Vdo Ag Strömungsventil
SE509815C2 (sv) 1997-07-01 1999-03-08 Akerlund & Rausing Ab Förpackningsmaskin
DE19929986C2 (de) * 1999-06-30 2002-11-21 Alfmeier Praez Ag Kraftstoffentnahmevorrichtung für Kraftfahrzeuge

Also Published As

Publication number Publication date
WO2001055582A1 (de) 2001-08-02
US20030159681A1 (en) 2003-08-28
DE10003748A1 (de) 2001-08-30
JP4488156B2 (ja) 2010-06-23
US6997168B2 (en) 2006-02-14
EP1254311A1 (de) 2002-11-06
DE50111004D1 (de) 2006-10-26
JP2003521617A (ja) 2003-07-15
ES2272454T3 (es) 2007-05-01

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