EP1511931B1 - Circuit d injection de fluide a haute pression - Google Patents

Circuit d injection de fluide a haute pression Download PDF

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Publication number
EP1511931B1
EP1511931B1 EP03735460A EP03735460A EP1511931B1 EP 1511931 B1 EP1511931 B1 EP 1511931B1 EP 03735460 A EP03735460 A EP 03735460A EP 03735460 A EP03735460 A EP 03735460A EP 1511931 B1 EP1511931 B1 EP 1511931B1
Authority
EP
European Patent Office
Prior art keywords
perimeter
circuit
cylinder
pump
fluid
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
EP03735460A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1511931A1 (fr
Inventor
Leonardo Cadeddu
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.)
VHIT SpA
Original Assignee
VHIT SpA
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Filing date
Publication date
Application filed by VHIT SpA filed Critical VHIT SpA
Publication of EP1511931A1 publication Critical patent/EP1511931A1/fr
Application granted granted Critical
Publication of EP1511931B1 publication Critical patent/EP1511931B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0041—Means for damping pressure pulsations
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • 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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements

Definitions

  • the present invention relates to a high pressure fluid injection circuit.
  • the object of the invention is to increase the performance of the high-pressure fluid injection circuit.
  • the invention is more particularly intended for the automotive field but can also be applied in other fields. In the automotive field, this circuit makes it possible to inject a fluid at high pressure into at least one cylinder of a motor.
  • the fluid is a fuel.
  • a fluid injection circuit comprises a fluid reservoir, a hydraulic fluid injection pump at low pressure (about 10 bar or about 1,000,000 Pascals) and at least one pump injector.
  • the reservoir, the injection pump and the injector-pump are connected by conduits allowing the fluid to flow from the reservoir via the injection pump to the injector-pump to then circulate again and return, for its surplus, in the tank.
  • the pump draws a fluid from the reservoir and increases the pressure of this fluid to a low pressure. In one example, this low pressure is under a pressure of 10 bar. This low pressure fluid is then expelled from the injection pump through the conduits.
  • a distributor distributes this fluid under low pressure to different injectors-pumps. Then each injector-pump increases the pressure up to 300 bar maximum and injected into its own cylinder at a pressure of 2050 bar maximum after opening a solenoid valve.
  • An injection circuit comprising such injector-pumps that can deliver a fluid at high pressure has the advantage of being more efficient than a circuit comprising an injection pump delivering a lower injection pressure.
  • a high injection pressure can correspond to about 2000 bar.
  • the pump or the ducts of the circuit can deteriorate, and the performance of such a circuit decreases substantially.
  • This pressure wave can also cause the formation of pressure peaks. When these pressure peaks are too high, it may happen that these peaks damage elements contained in the injection circuit, reducing the performance of the high pressure injection circuit. For example, pressure peaks of 60 bar can be obtained for pressures delivered at 2000 bar and damage the elements contained in the injection circuit.
  • the invention consequently provides a pressure wave damper interposed in the ducts of the high-pressure fluid injection circuit.
  • this damper is designed in such a way that it forces the fluid to follow paths of different lengths in several lanes.
  • the direction of the fluid is such that the fluid must pass through narrow passage sections for fluid movement to accelerate. Accelerating this movement of fluid creates turbulence. This turbulence breaks the smooth movement of the fluid, thus attenuating the pressure wave and the resulting pressure peaks.
  • the damper comprises a cylinder, inside which is disposed a rod.
  • This rod is provided with trays, which trays delimit open compartments. The fluid flows through these compartments through narrow passage sections.
  • the subject of the invention is therefore a high pressure fluid injection circuit comprising a low pressure fluid injection pump connected by conduits to a reservoir on the one hand, and at least one pump injector intended to supplying the high pressure fluid on the other hand, characterized in that it comprises a pressure wave damper interposed between an output of the pump in the direction of the pump injector and the pump injector and in that the damper is placed in the body of the pump.
  • FIG. 1 shows a high-pressure fluid injection circuit 1 comprising a low-pressure fluid injection pump 2 connected by conduits 3.1 and 3 to a fluid reservoir 5 and to at least one pump injector. 8 respectively according to the invention.
  • the pump 2 is incorporated in a body 4. A supply of fluid in such a circuit is effected in the following manner.
  • the pump 2 draws the fluid 5 contained in the reservoir 6 through the conduit 3.1. In one example, it may be a fuel tank, such as diesel. Once mounted in pressure inside the pump 2, the fluid 5 is sent through conduits 3. In one example, the low pressure pump 2 increases the fluid pressure by about 10 bar.
  • the ducts 3 here comprise a distributor 7 connected to at least one pump injector 8. In one example, the distributor 7 is connected to four pump injectors 8.
  • the pump injector 8 is connected to a cylinder 9 of an engine (not shown) inside which slides a piston 9.1.
  • the injector-pump is intended to expel a volume of fluid at high pressure through an orifice (not shown) closed at rest by an injector needle (not shown).
  • the pressure of the fluid at the time of its expulsion from the pump injector is 2050 bars.
  • the pump injector 8 is also provided with a solenoid valve 10 whose opening 11 and the closure 12 are controlled by an order Oi, FIG. 2.
  • the opening 11 and the closure 12 of the solenoid valve 10 of FIG. each of the pump injectors 8 are controlled by a control command 01 to 04, FIGS. 1 and 2.
  • the solenoid valve thus makes it possible to allow an intermittent supply of fluid to each pump injector.
  • the solenoid valve 10 may be in the opening or closing phase 12.
  • the opening may be predetermined during a transient period so as to allow a pre-injection of fluid into the injector. pump.
  • the fluid is then compressed inside the injector-pump up to 300 bar.
  • the needle of the injector is dislodged from the orifice of the injector-pump.
  • the fluid is then expelled into the engine cylinder at a pressure of about 2050 bar since the fuel supply to the pump injector is greater than the amount that can escape through the pump injector orifice. .
  • a return of fluid towards the reservoir is carried out as follows.
  • the fluid flows in the opposite direction of the direction followed by the fluid when feeding the circuit when the solenoid valve opens again.
  • the excess of fluid necessary for an effective pressure rise inside the pump injector then returns to the reservoir by other conduits (not shown) different from the ducts 3.
  • the high-pressure fluid injection circuit 1 comprises a pressure wave damper 14.
  • the damper 14 is interposed between an output of the pump 2 in the direction of the pump injector 8 and the pump injector 8, Figure 1. More precisely, the damper 14 is located inside the body 4 of the pump 2, at the place where the output of the pump is towards the pump injector 8.
  • This damper 14 comprises in one example a cylinder 15, FIG. 4 with a solid outer portion 16 and a hollow central portion 17.
  • a transverse section of the damper makes it possible to visualize a transverse section 18 of the central portion 17 of the cylinder 15, FIG. 4. On this transverse section 18, it is possible to distinguish a perimeter 19, a surface 20, and a center 21.
  • the cylinder 15 is circular, Figure 4, but this cylinder 15 can also be rectangular.
  • This rod 22 comprises at least one plate 23.
  • the cross section of the damper 14 also makes it possible to display a section This transverse section 24 makes it possible to distinguish a perimeter 25 and a surface 26.
  • the rod 22 comprises several plates 23, FIGS. 3, 4 and 5. In FIG. 3, a plate 23 can be viewed. in dotted line located below the plate 23 present in the plane of the drawing.
  • the rod 22 comprises six trays 23 and is 60 millimeters long, FIGS. 3 and 5.
  • the trays 23 are arranged on the rod 22 one after the other at the same distance 27.
  • the plates 23 delimit compartments 28.
  • the plates 23 are in the form of a disc cut along a rope and delimit five compartments 28, FIGS. 5.
  • the trays 23 are identical and the normals on their cords are oriented at an angle 29 different from one tray to another with respect to an axis 30 defined by the rod 22 and passing through the center 21.
  • the trays 23 are oriented, alternately, with respect to each other at an angle of 180 ° with respect to the axis 30 of the rod 22, FIGS. 4 and 5.
  • the plates 23 are arranged perpendicular to the axis 30, FIG. another example, it would be possible to provide an orientation of an angle 180 ° producing a helical progression of these orientations.
  • the surface 26 of the plate 23 corresponds to at least half of the surface 20 of the section 18 of the central portion 17 of the cylinder 15.
  • the perimeter 25 of the plate 23 also partially matches the perimeter 19 of the central portion. 17 of the section 18 of the cylinder 15, FIG.
  • the perimeter 25 of the plate 23 has a portion 31 and a portion 32.
  • the portion 31 matches the perimeter 19 of the cylinder 15 while the portion 32 does not marry, Figure 4.
  • the perimeter 19 of the cylinder 15 also has a portion 33 conforming to the plate 23 and a portion 34 not marrying it.
  • the portion 32 of the plate 23 and the portion 34 of the cylinder 15 delimit a lateral orifice 35 with respect to the axis 30 defined by the rod 22, FIG. 4. Due to the presence of this lateral orifice 35 on each plate 23, the compartments 28 are open inside the cylinder 15, FIG.
  • the plate 23 is made in such a way that, along an axis 38 perpendicular to the axis 30 defined by the rod 22, a point of the portion 31 of the perimeter 25 of the plate 23 is separated from another point of the portion 32 of the perimeter 25 from a distance 36.
  • a point of the portion 32 is separated from a point of the portion 34 along the axis 38 perpendicular to the axis 30 of the rod 22 by a distance 37.
  • the distance 36 is 4.5 millimeters and the distance 37 is 1.5 millimeters, for a diameter of 6 millimeters to plus or minus 20%, thus obtaining a good compromise between size and robustness.
  • This pressure wave 40 moves in space and in time, FIGS. 6 and 7.
  • This pressure wave 40 emits at least one pressure peak 41 following the closure of the solenoid valve 10, FIG. 7.
  • FIG. 7 shows four pressure peaks 41 of a pressure wave 40 resulting from the successive opening 11 and closure 12 of the solenoid valve 10 of each of the four fluid injectors 8. These pressure peaks 41 can reach up to a pressure of 60 bar.
  • the lateral orifices 35 and the arrangement of the trays 23 one above the other create narrowing and widening of sections inside the cylinder 15 of the damper 14. These narrowing and enlargements of sections force the fluid to break. its rectilinear trajectory. The opposite wave must pass through the same places.
  • the fluid 5 exiting the pump 2 enters the interior of the damper 14.
  • the path 42 of the fluid inside the cylinder 15 has a sinusoidal shape, FIG. 3.
  • the pressure wave 40 penetrates inside the cylinder 15 and describes the same trajectory 43 visible in dashed lines in FIG. 3.
  • the fluid 5 under pressure creates turbulence inside the compartments 28 after passing through the orifices laterally substantially attenuating pressure peaks of the pressure wave up to 50% of their maximum value.

Landscapes

  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Pens And Brushes (AREA)
  • Gas Separation By Absorption (AREA)
  • Safety Valves (AREA)
EP03735460A 2002-05-29 2003-05-26 Circuit d injection de fluide a haute pression Expired - Lifetime EP1511931B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITTO20020453 2002-05-29
IT2002TO000453A ITTO20020453A1 (it) 2002-05-29 2002-05-29 Circuito di iniezione di fluido ad alta pressione.
PCT/EP2003/005482 WO2003100245A1 (fr) 2002-05-29 2003-05-26 Circuit d'injection de fluide a haute pression

Publications (2)

Publication Number Publication Date
EP1511931A1 EP1511931A1 (fr) 2005-03-09
EP1511931B1 true EP1511931B1 (fr) 2007-02-21

Family

ID=27639121

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03735460A Expired - Lifetime EP1511931B1 (fr) 2002-05-29 2003-05-26 Circuit d injection de fluide a haute pression

Country Status (13)

Country Link
US (1) US20050224052A1 (it)
EP (1) EP1511931B1 (it)
JP (1) JP2005527738A (it)
KR (1) KR100973177B1 (it)
CN (1) CN100366887C (it)
AT (1) ATE354727T1 (it)
AU (1) AU2003237680A1 (it)
BR (1) BR0305021A (it)
DE (1) DE60311987T2 (it)
ES (1) ES2280757T3 (it)
IT (1) ITTO20020453A1 (it)
RU (1) RU2004139023A (it)
WO (1) WO2003100245A1 (it)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1818258A (en) * 1928-06-18 1931-08-11 James D Isaacks Gauge stabilizer
DE2803049A1 (de) * 1978-01-25 1979-08-09 Bosch Gmbh Robert Pumpe-duese fuer brennkraftmaschinen
DE2823734A1 (de) * 1978-05-31 1979-12-06 Bosch Gmbh Robert Kraftstoff-foerderaggregat
JPS57177485A (en) * 1981-04-22 1982-11-01 Sharp Kk Ripple removing device in liquid feeder
DE3146454A1 (de) * 1981-11-24 1983-06-01 Robert Bosch Gmbh, 7000 Stuttgart Element zum daempfen von druckschwingungen in hydraulischen systemen
DE4106015A1 (de) * 1991-02-26 1992-08-27 Ficht Gmbh Druckstoss-kraftstoffeinspritzung fuer verbrennungsmotoren
US5516266A (en) 1993-09-07 1996-05-14 Walbro Corporation Fuel pump tubular pulse damper
DE19516358C1 (de) * 1995-05-04 1996-08-22 Daimler Benz Ag Pulsationsdämpfer für Kraftstoff im Kraftstoffversorgungssystem einer Brennkraftmaschine
US5619969A (en) * 1995-06-12 1997-04-15 Cummins Engine Company, Inc. Fuel injection rate shaping control system
DE19854551A1 (de) * 1998-11-26 2000-05-31 Bosch Gmbh Robert Flachrohrdruckdämpfer zur Dämpfung von Flüssigkeits-Druckschwingungen in Flüssigkeitsleitungen
US6155235A (en) * 1999-05-14 2000-12-05 Siemens Automotive Corporation Pressure pulsation damper with integrated hot soak pressure control valve

Also Published As

Publication number Publication date
DE60311987T2 (de) 2007-10-31
EP1511931A1 (fr) 2005-03-09
BR0305021A (pt) 2004-11-09
WO2003100245A1 (fr) 2003-12-04
CN100366887C (zh) 2008-02-06
ITTO20020453A1 (it) 2003-12-01
DE60311987D1 (de) 2007-04-05
AU2003237680A1 (en) 2003-12-12
RU2004139023A (ru) 2006-02-20
ITTO20020453A0 (it) 2002-05-29
ATE354727T1 (de) 2007-03-15
KR20050020966A (ko) 2005-03-04
CN1666019A (zh) 2005-09-07
US20050224052A1 (en) 2005-10-13
JP2005527738A (ja) 2005-09-15
KR100973177B1 (ko) 2010-07-30
ES2280757T3 (es) 2007-09-16

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