EP1227242B1 - Kraftstoffzufuhrsystem - Google Patents

Kraftstoffzufuhrsystem Download PDF

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Publication number
EP1227242B1
EP1227242B1 EP20010128495 EP01128495A EP1227242B1 EP 1227242 B1 EP1227242 B1 EP 1227242B1 EP 20010128495 EP20010128495 EP 20010128495 EP 01128495 A EP01128495 A EP 01128495A EP 1227242 B1 EP1227242 B1 EP 1227242B1
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
fluid
pump
discharge
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
EP20010128495
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English (en)
French (fr)
Other versions
EP1227242A2 (de
EP1227242A3 (de
Inventor
Norio Takehana
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.)
Mikuni Corp
Original Assignee
Mikuni Corp
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Filing date
Publication date
Application filed by Mikuni Corp filed Critical Mikuni Corp
Publication of EP1227242A2 publication Critical patent/EP1227242A2/de
Publication of EP1227242A3 publication Critical patent/EP1227242A3/de
Application granted granted Critical
Publication of EP1227242B1 publication Critical patent/EP1227242B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/01—Pressure before the pump inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/12—Pressure pulsations before the pump

Definitions

  • the present invention relates to a fuel supply system according to the preamble of claim 1.
  • This fuel supply system comprises a fuel supply path for enabling fuel to pass from a fuel tank 1 filled with light oil to a fuel combustion chamber of an engine 4 via a fuel pump 2 for force-feeding fuel for engine use and an injection pump 3, and a fuel supply path for enabling fuel to pass to a booster heater 6 via a fuel pump 5 constituting a fluid pump for pressure-feeding fuel for the heater from the fuel tank 1.
  • the discharge side of the fuel pump 5 is directly connected to an intake line 7 passing from the fuel tank 1 and the discharge side of the fuel pump 5 is connected to a discharge line 8 communicating with the booster heater 6.
  • the fuel pump 5 can therefore discharge a desired amount of fuel without being subjected to the influence of the fuel pump 2 or the injection pump 3.
  • a fuel supply system is considered where an intake line 7' is connected to the downstream side of the fuel pump 2, with this intake line 7' being connected to the intake side of the fuel pump 5 so as to supply fuel to the booster heater 6.
  • US 4,187,813 relates to a fuel supply system for an internal combustion engine having a fuel injection pump for conveying a controlled amount of fuel to be injected into the engine.
  • a fuel supply system comprising a fuel supply path for enabling fuel to pass from a fuel tank to a combustion chamber of an engine via a fuel pump and an injection pump, and a fuel supply path for enabling fuel to pass to a booster heater via a fluid pump
  • the fluid pump comprises a force-feeding pump for taking in fluid from an intake line, which branches from the downstream side of the fuel pump, and for discharging fluid at a desired pressure towards a discharge line, and an opening and closing valve arranged so as to close a path of the discharge line and to open a path of the discharge line when the pressure of a fluid discharged in the direction of the discharge line exceeds a prescribed pressure, wherein the pressure of a fluid within the intake line acts in a direction opposing the pressure of the discharge fluid at the opening and closing valve.
  • a fluid pump of the present invention comprises a forcefeeding pump for taking in fluid from an intake line and discharging fluid at a desired pressure towards a discharge line; and an opening and closing valve arranged in such a manner as to urge in a direction closing a path of the discharge line, and open a path of the discharge line when pressure of fluid discharged in the direction of the discharge line exceeds a prescribed pressure.
  • Pressure of fluid within the intake line acts in a direction opposing the pressure of the discharge fluid at the opening and closing valve.
  • fluid taken in from the intake line is raised in pressure to a desired pressure by the force-feeding pump and discharged towards the discharge line.
  • the opening and closing valve then opens the path when the pressure of the discharged fluid exceeds a prescribed pressure and the fluid is supplied to the downstream side.
  • the pressure of the fluid within the intake line acts in a direction that closes the path. Therefore, even if the pressure within the intake line fluctuates, such pressure fluctuations act in both the opening and closing direction of the opening and closing valve and therefore cancel each other out.
  • the opening and closing valve therefore opens due to a prescribed discharge pressure without being influenced by pressure fluctuations in the intake line and the amount of fluid discharged is therefore stable.
  • the fluid pump can therefore supply a stable amount of discharged fuel to the desired subject (for example, a booster heater) without being subjected to the influence of pressure fluctuations occurring on the downstream side of the fuel pump for force-feeding engine fuel.
  • the opening and closing valve has a freely reciprocating piston formed in such a manner that pressure of the discharge fluid acts at one end thereof, and spring urging force and pressure of the fluid within the intake line acts on the other end thereof.
  • pressure of the discharged fluid acts on one end of the piston, while pressure of the fluid within the intake line and an urging force of a spring act on the other end.
  • pressure fluctuations within the intake line act on both sides of the piston and therefore cancel each other out.
  • the piston can therefore open and close the path using just the relationship between the urging force of the spring set in advance and the discharge force of the fluid.
  • the opening and closing valve has a diaphragm for opening and closing the path of the discharge line, formed in such a manner that pressure of the discharge fluid acts at a surface on one side, and urging force of the spring and pressure of fluid within the intake line act on a surface on the other side.
  • pressure of the discharged fluid acts on a surface at one side of the diaphragm, while pressure of the fluid within the intake line and an urging force of a spring act on the surface on the other side.
  • pressure fluctuations within the intake line act on surfaces on both sides of the diaphragm and therefore cancel each other out.
  • the diaphragm can therefore open and close the path using just the relationship between the urging force of the spring set in advance and the discharge force of the fluid.
  • the discharge line side and the intake line side are completely separated by the diaphragm. This means that leaks (seepage) between the sides can be completely prevented and a more stable discharge amount can be ensured.
  • the opening and closing valve has bellows formed in such a manner as to freely expand and contract, and a seal for opening and closing the path of the discharge line, formed at an end of the bellows in such a manner that pressure of the discharge fluid acts at a surface on one side, and urging force of the spring and pressure of fluid within the intake line act on a surface on the other side.
  • pressure of the discharged fluid acts on a surface at one side of the diaphragm, while pressure of the fluid within the intake line and an urging force of a spring act on the surface on the other side.
  • pressure fluctuations within the intake line act on surfaces on both sides of the seal having the same bearing area and therefore cancel each other out.
  • the bellows therefore compress and expand using just the relationship between the urging force of the spring set in advance and the discharge force of the fluid so as to open and close the path.
  • the intake line side and the discharge line side are completely separated by the bellows and the seal. Leaking (seepage) between the two sides is therefore completely prevented, it is straightforward to make the pressure bearing area for the discharge side and the intake side at the seal the same, and a more stable discharge amount can therefore be ensured.
  • FIG. 1 to FIG. 3 show a first embodiment of the fluid pump of the present invention, with FIG. 1 being a system view, FIG. 2 being a view illustrating operation, and FIG. 3 being a cross-sectional view of a force-feeding pump.
  • the fluid pump used in this embodiment is that used in supplying fuel to a booster heater of a vehicle mounted with a diesel engine.
  • the fuel supply system of the present invention comprises an engine side supply path for supplying fuel from a fuel tank 10 filled with light fuel to a combustion chamber of an engine 40 via a fuel pump 20 and an injection pump 30, and a heater side supply path on the downstream side of the fuel pump 20 and branching from the upstream side of the injection pump 30, for supplying fuel to a booster heater 60 via a fluid pump 50.
  • the fluid pump 50 is comprised of a solenoid pump 90 constituting a pressure-feed pump and an opening and closing valve 100 for opening and closing a path of the discharge line 80.
  • the upstream side (intake side) of the solenoid pump 90 is connected to an intake line 70 branching from the downstream side of the fuel pump 20 and the downstream side (discharge side) of the solenoid pump 90 is connected to a discharge line 80 communicating with the booster heater 60.
  • One end of the opening and closing valve 100 is connected midway long the discharge line 80 (between an upstream discharge line 81 and a downstream discharge line 82), and the other end is connected to the intake line 70.
  • the opening and closing valve 100 is formed from a piston 100 constituting a valve body located so as to move in a freely reciprocating manner within a cylinder bore 101, a spring 120 for urging the piston 110 in a direction closing (blocking between the upstream discharge line 81 and the downstream discharge line 82) the path of the discharge line 80, and a communicating path 130 formed at a side surface of the cylinder bore 101 and communicating with the downstream discharge line 82.
  • One end of the cylinder bore 101 communicates with the upstream discharge line 81 and the other end of the cylinder bore 101 communicates with the intake line 70.
  • the pressure of fuel (discharged fluid) discharged from the solenoid pump (force-feeding pump) 90 through the upstream discharge line 81 acts on an end surface 111 at one end of the piston 110 and pressure of the fuel (fluid) within the intake line 70 and the urging force of the spring 120 act on another end surface 112 of the piston 110 (pressure of the fuel within the intake line 70 acts in a direction opposed to the pressure of the discharge fuel).
  • the piston 110 therefore stays at a position where the forces acting from both sides are balanced.
  • the pressure Ps of the fuel within the intake fire 70 acts from both sides of the piston 110 and is therefore canceled out. This means that only the pressure P and the urging force of the spring 120 act on the piston 110.
  • the piston 110 therefore moves to a position set in advance due to the balance of the pressure P and the urging force, and a prescribed amount of fuel is discharged towards the downstream discharge line 82.
  • the solenoid pump (force-feeding pump) 90 therefore provides a stably discharged amount of fuel without being influenced by pressure fluctuations of fuel within the intake line 70.
  • the fluid pump 50 can therefore be made small and have a simple structure as a result of constructing the opening and closing valve 100 from a piston 110 sliding within the cylinder bore 101 and a spring 120.
  • the solenoid pump 90 constituting the forco-feeding pump is a pump of a know configuration.
  • the solenoid pump 90 comprises an intake side pipe 90a, an outer yoke 90b, and end yoke 90c, an electromagnetic coil 90d, a discharge-side pipe 90e, a sleeve 90f, a plunger 91 inserted in a freely slidable manner within the sleeve 90f, a coil spring 92 urging the plunger 91 towards the upstream side, an intake valve 93 for opening an closing a path 91a within the plunger 91, a coil spring 94 for urging the intake valve 93 in a closing direction, a discharge valve 95, and a coil spring 96 for urging the discharge valve 95 in a closing direction, etc.
  • the plunger 91 moves to the downstream side, and fuel compressed by this movement acts against the urging force of the coil spring 96 so as to open the discharge valve 95, so that the fuel is supplied to the discharge line 80 via the discharge side pipe 90e.
  • the discharge valve 95 closes the path due to the urging force of the coil spring 96 and the plunger 91 moves towards the upstream side due to the urging force of the coil spring 92.
  • the downstream side pressure is lower than the upstream pressure.
  • the intake valve 93 therefore opens in opposition to the urging force of the coil spring 94 and fuel is taken in in a downstream direction. This sequence of operations therefore enables a prescribed amount of fuel to be discharged.
  • FIG. 4 is a graph showing discharge characteristics when the pressure of fuel within the intake line 70 changes.
  • FIG. 4 shows a related characteristic for the discharge characteristics when only the related solenoid pump (forcefeeding pump) 90 is connected by the intake line 7' shown by the two-dotted and dashed line in FIG. 7 and characteristics for the present invention for discharge characteristics for the fluid pump 50 of the present invention with the opening and closing valve 100 added to the solenoid pump 90.
  • discharge characteristics for when the clearance (spacing) between the piston 110 of the opening and closing valve 100 and the cylinder bore 101 differs i.e. graphs are shown for a large clearance (for example, approximately 15 ⁇ m) and for a small clearance (for example, approximately 5 ⁇ m).
  • the amount of discharge is substantially fixed even if pressure within the intake line 70 fluctuates.
  • FIG. 5 is a view showing a further embodiment of a fluid pump of the present invention.
  • a fluid pump 50' of this embodiment comprises the solenoid pump 90 constituting the force-feeding pump and a diaphragm-type opening and closing valve 200.
  • the opening and closing valve 200 comprises a diaphragm 210 dividing up a discharge side space and an intake side space, and a spring 220 urging the diaphragm 210 towards the discharge side space.
  • An upstream discharge line 81 and a downstream discharge line 82 are connected to the discharge side space and a seal 211 formed above the diaphragm 210 opens and closes an opening 81a of the upstream discharge line 81.
  • the spring 220 is located at the intake side space and the intake line 70 is also connected to the intake side space.
  • the pressure of fuel (discharged fluid) discharged from the solenoid pump 90 acts upon one side surface of the diaphragm 210 and the urging force of the spring 220 and the pressure of fuel within the intake line 70 act on the other side surface of the diaphragm 210 (the pressure of fuel within the intake line 70 acts in a direction resisting the pressure of the discharged fuel).
  • the seal 211 then opens and closes the path of the discharge line 80 accordingto the relationship of the force acting from both sides.
  • the solenoid pump (force-feeding pump) 90 therefore provides a stably discharged amount of fuel without being influenced by pressure fluctuations of fuel within the intake line 70.
  • the discharge side space and the intake side space are completely separated by the diaphragm 210. There is therefore no leakage (seeping) between the sides and a more stable discharge characteristic can be obtained.
  • FIG. 6 is a view showing a still further embodiment of a fluidpump of the present invention.
  • a fluid pump 50" of this embodiment comprises the solenoid pump 90 constituting the force-feeding pump and a bellows-type opening and closing valve 300.
  • the opening and closing valve 300 comprises bellow 310 dividing up a discharge side space and an intake side space and freely expanding and contracting in one direction, and a spring 320 urging the bellows 310 towards the discharge side space.
  • An upstream discharge line 81 and a downstream discharge line 82 are connected to the discharge side space and a seal 311 formed at an upper end of the bellows 310 opens and closes an opening region of the upstream discharge line 81.
  • the spring 320 is located at the intake side space and the intake line 70 is connected to the intake side space.
  • the pressure of fuel (discharged fluid) discharged from the solenoid pump 90 acts upon the upper surface of the seal 311 positioned at the upper end of the bellows 310 and the urging force of the spring 320 and the pressure of fuel within the intake line 70 acts on the lower side surface of the bellows 310 (the pressure of fuel within the intake line 70 acts in a direction resisting the pressure of the discharged fuel).
  • the seal 311 then opens and closes the path of the discharge line 80 according to the relationship of the force acting from both sides.
  • the solenoid pump (forco-feeding pump) 90 therefore provides a stably discharged amount of fuel without being influenced by pressure fluctuations of fuel within the intake line 70.
  • the discharge side space and the intake side space are completely separated by the bellows 310 and the seal 311. There is therefore no leakage (seeping) between the sides and a more stable discharge characteristic can be obtained.
  • a plunger-type solenoid pump 90 taken as a force-feeding pump making up part of the fluid pumps 50, 50' and 50" is shown but the present invention is by no means limited in this respect and other related mechanical or electrical fluid pumps (force-feeding pumps) are also applicable.
  • a fuel supply system for supplying fuel to a booster heater 60 is shown as a fluid supplying system to which the fluid pumps 50, 50' and 50" are applied but the present invention is by no meanslimited in this respect, and providing the fuel system does not incur the influence of pressure fluctuations etc. in the intake line etc., the fluid is not limited to light oil and application to supply systems for supplying fluid constituted by gasoline aken as a fuel, oil taken as a working medium, or water, steam or gas (vapor) etc. is also possible.
  • items formed separately from the solenoid pump (force-feeding pump) 90 are formed as the intake line 70 and the discharge line 80 connecting to the fluid pumps 50, 50' and 50", but the present invention is by no means limited in this respect.
  • paths corresponding to the intake line and the discharge line may be formed integrally with the solenoid pump (force-feeding pump) 90 so that the present invention may also include fluid pumps where the opening and closing valves 100, 200 and 300 are provided integrally with the solenoid pump (force-feeding pump) 90.
  • a force-feeding pump for taking in fluid from an intake line and discharging fluid at a desired pressure towards a discharge line, and an opening and closing valve arranged in such a manner as to urge in a direction closing a path of the discharge line, and open a path of the discharge line when pressure of fluid discharged in the direction of the discharge line exceeds a prescribed pressure.
  • fuel can be supplied to a hoser in a stable manner without the influence of pressure fluctuations due to vibrations etc. in the fuel supply system being incurred.
  • an opening and closing valve constituting the fluid pump from a piston and spring, etc.
  • a device can be made smaller and can be simplified, and by forming the opening and closing valve from a diaphragm or bellows etc., leakage between the discharge side and the intake side is prevented, and a more stable discharge characteristic can be obtained.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)

Claims (5)

  1. Kraftstoffversorgungssystem, umfassend einen Kraftstoffversorgungsweg, welcher Kraftstoff ermöglicht, aus einem Kraftstofftank (1; 10) zu einer Verbrennungskammer eines Motors (4; 40) über eine Kraftstoffpumpe (2; 20) und eine Einspritzpumpe (3; 30) zu gelangen, und einen Kraftstoffversorgungsweg, welcher Kraftstoff ermöglicht, zu einem Verstärker- bzw. Zusatzheizer (6; 60) über eine Fluidpumpe (5; 50; 50'; 50") zu gelangen, dadurch gekennzeichnet, dass die Fluidpumpe (50; 50'; 50") eine Zwangsförderpumpe (90) besitzt, welche Fluid aus einer Einlassleitung (70) einlässt, die von der stromab gelegenen Seite der Kraftstoffpumpe (2; 20) abzweigt, und welche Fluid mit einem gewünschten Druck in Richtung einer Ablassleitung (80) ablässt, und ein Öffnungs- und Verschlussventil (100; 200; 300), das angeordnet ist, um einen Weg der Ablassleitung (80) zu schließen und um einen Weg der Ablassleitung (80) zu öffnen, wenn der Druck eines Fluids, das in Richtung der Ablassleitung (80) abgelassen wird, einen vorgegebenen Druck überschreitet, wobei der Druck eines Fluids innerhalb der Einlassleitung (70) in eine Richtung wirkt, die dem Druck des Ablassfluids am Öffnungs- und Verschlussventil (100; 200; 300) entgegengesetzt ist.
  2. Kraftstoffversorgungssystem nach Anspruch 1, wobei die Einlassleitung (70) mit einer stromab gelegenen Seite einer Kraftstoffpumpe (20) zum Einspeisen von Kraftstoff in den Motor (40) in Verbindung steht.
  3. Kraftstoffversorgungssystem nach Anspruch 1 oder Anspruch 2, wobei das Öffnungs- und Verschlussventil (100; 200; 300) einen sich frei hin- und herbewegenden Kolben (110) aufweist, der in solch einer Weise geformt ist, dass der Druck des Ablassfluids auf die eine Endoberfläche (111) desselben wirkt, und die drängende Kraft einer Feder (120) und der Druck des Fluids innerhalb der Einlassleitung (70) auf die andere Endoberfläche (112) desselben wirken.
  4. Kraftstoffversorgungssystem nach Anspruch 1 oder Anspruch 2, wobei das Öffnungs- und Verschlussventil (100; 200; 300) ein Diaphragma (210) zum Öffnen und Schließen des Wegs der Ablassleitung (80) aufweist, das in solch einer Weise geformt ist, dass der Druck des Ablassfluids auf eine Oberfläche auf der einen Seite wirkt, und die drängende Kraft der Feder (220) und der Druck des Fluids innerhalb der Einlassleitung (70) auf eine Oberfläche auf der anderen Seite wirken.
  5. Kraftstoffversorgungssystem nach Anspruch 1 oder Anspruch 2, wobei das Öffnungs- und Verschlussventil (100; 200; 300) Bälge (310) aufweist, die geformt sind, um sich ungehindert auszudehnen und zusammenzuziehen, und eine Dichtung (311) zum Öffnen und Schließen des Wegs der Ablassleitung (80), welche Dichtung an einem Ende der Bälge (310) in solch einer Weise geformt ist, dass der Druck des Ablassfluids auf eine Oberfläche auf der einen Seite wirkt, und die drängende Kraft der Feder (320) und der Druck des Fluids innerhalb der Einlassleitung (70) auf eine Oberfläche auf der anderen Seite wirken.
EP20010128495 2001-01-24 2001-12-07 Kraftstoffzufuhrsystem Expired - Lifetime EP1227242B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001015664 2001-01-24
JP2001015664 2001-01-24

Publications (3)

Publication Number Publication Date
EP1227242A2 EP1227242A2 (de) 2002-07-31
EP1227242A3 EP1227242A3 (de) 2003-06-11
EP1227242B1 true EP1227242B1 (de) 2007-01-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010128495 Expired - Lifetime EP1227242B1 (de) 2001-01-24 2001-12-07 Kraftstoffzufuhrsystem

Country Status (2)

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EP (1) EP1227242B1 (de)
DE (1) DE60126056T2 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2715587C2 (de) * 1977-04-07 1986-07-03 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffversorgungseinrichtung für Brennkraftmaschinen
US4314797A (en) * 1978-02-09 1982-02-09 J. Eberspacher Metering piston pump
DE19618707C2 (de) * 1996-05-09 1998-12-17 Siemens Ag Verfahren und Vorrichtung zur Regelung eines Kraftstoffvolumenstromes
DE19738502A1 (de) * 1997-09-03 1999-03-04 Bosch Gmbh Robert System zur Hochdruckerzeugung
IT1299987B1 (it) * 1998-04-27 2000-04-04 Magneti Marelli Spa Pompa volumetrica.
JP4203160B2 (ja) * 1998-11-13 2008-12-24 株式会社ミクニ 電磁ポンプ

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Publication number Publication date
DE60126056T2 (de) 2007-07-12
DE60126056D1 (de) 2007-03-08
EP1227242A2 (de) 2002-07-31
EP1227242A3 (de) 2003-06-11

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