EP1751421B1 - Pumpendüse - Google Patents

Pumpendüse Download PDF

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Publication number
EP1751421B1
EP1751421B1 EP05766704A EP05766704A EP1751421B1 EP 1751421 B1 EP1751421 B1 EP 1751421B1 EP 05766704 A EP05766704 A EP 05766704A EP 05766704 A EP05766704 A EP 05766704A EP 1751421 B1 EP1751421 B1 EP 1751421B1
Authority
EP
European Patent Office
Prior art keywords
fuel
capacity
injector
internal volume
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.)
Not-in-force
Application number
EP05766704A
Other languages
English (en)
French (fr)
Other versions
EP1751421A1 (de
Inventor
Pierre Chaufour
Mourad Hedna
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.)
Renault Trucks SAS
Original Assignee
Renault Trucks SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Renault Trucks SAS filed Critical Renault Trucks SAS
Publication of EP1751421A1 publication Critical patent/EP1751421A1/de
Application granted granted Critical
Publication of EP1751421B1 publication Critical patent/EP1751421B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • 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
    • F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

  • the invention relates to a fuel injection system for an internal combustion engine.
  • the fuel is directly sprayed inside the combustion chamber of the engine of the gasoline or diesel type in particular. It is therefore within this combustion chamber that the mixture between the fuel and the air, which plays the role of oxidizer, is effected.
  • pump injector It is more particularly an injector, commonly called “pump injector”, thus having a piston for compressing the fuel within its internal volume.
  • This piston is moved by means of a camshaft driven via the crankshaft of the engine either directly or indirectly.
  • the pump injectors can inject fuel only during a main phase of injection, corresponding to the injection before the explosion in the combustion chamber. This injection is achieved through a cam profile that moves a piston inside the injector so as to compress the fuel just before the main injection. The compressed fuel is then injected into the combustion chamber.
  • this type of injection system does not allow to inject fuel outside an active zone of the cam.
  • this type of secondary injections it is possible to send unburned fuel to the level of a particulate filter in the exhaust line, which has the effect of cleaning and regenerating it. .
  • each injector it is necessary to connect to a high pressure ramp which thus comprises a large number of connections which are as many potential leak areas.
  • injector systems pumps injected by cams whose active area comprises a succession of hollows and bumps. It is then possible to inject at different times fuel for post-processing needs or new combustion concepts, such as HCCI meaning "Homogeneous Charge Compression Ignition".
  • HCCI Hemogeneous Charge Compression Ignition
  • the requirements related to the mechanical strength and the manufacturing constraints of the cam limit the characteristics of the main active zone of the cam. They also affect the filling of the injector because of an increase in the recoil speed of the injector plunger.
  • the position of the secondary injection is dependent on the design of the cam, which limits the flexibility and allows to vary the injection phases independently.
  • An injector of this type is described in the document WO01 / 14712 .
  • the object of the invention is to provide an adaptive system for current injection systems and which is otherwise reliable and flexible.
  • Such a system must also allow to inject fuel under pressure inside an engine, regardless of the position of the piston without limitation in the amount injected, and with very high fuel pressures.
  • the invention therefore relates to a pump injector according to claim 1.
  • each injector comprises an area where pressurized fuel can be stored and then evacuated to allow a secondary injection phase that can occur early, or late compared to the main injection phase to n ' any moment of the cycle.
  • This capacitance is placed in communication with the internal volume of the injector by means of a second solenoid valve which, when it is simultaneously activated with the first solenoid valve, makes it possible to carry out several injections and in particular a main injection phase and a secondary phase.
  • the pump injector comprises, at a filling pipe intended to allow the filling of the fuel capacity under pressure, a non-return filling means adapted to allow the flow of fuel in one direction, from the internal volume to the capacity.
  • the capacity is connected to the internal volume of the injector by means of a filling pipe in which the fuel under pressure circulates in only one direction.
  • a non-return means such as a valve, is reported inside this pipe to allow the flow of fuel in the direction of the internal volume to the capacity.
  • the circulation of fuel inside this pipe does not occur until the main injection phase is over. This is achieved by disabling the first solenoid valve while keeping the second one active.
  • the non-return filling means may comprise a member for allowing the flow of fuel when the pressure difference between the internal volume and the capacity exceeds a predetermined threshold value.
  • this elastic means can be calibrated at a pressure which is greater than that present in the injector during the main injection phase.
  • the dead volume internal to the injector is not increased compared to a standard injector and the yield is identical.
  • the elastic means acts as a pressure limiter. This situation occurs mainly when the duration is long, the engine speed is high and that a post injection is performed at a very close time to the end of the main injection, without having to operate the second solenoid valve.
  • the injector comprises, at the level of an injection pipe intended to make the capacity communicate with the internal volume, a non-return injection means capable of allowing the flow of the fuel in one direction only, the capacity towards the internal volume.
  • the fuel under pressure is evacuated from the capacity when an injection must be made, at a specific injection line, which allows the fuel to circulate in one direction only, and more specifically in the sense of capacity towards the internal volume of the injector.
  • This circulation is performed once the capacity filled and the second solenoid valve activated since it then allows the capacity to communicate with the internal volume of the injector.
  • the invention relates to a pump injector for compressing and then injecting fuel into the combustion chamber of an engine.
  • the pump injector (1) compresses fuel that is initially at a low pressure in a supply circuit (16). This compression is obtained by means of a cam (4) driven in rotation by the movement of the crankshaft motor directly or indirectly. This cam (4) then moves a piston (5) capable of compressing the fuel.
  • a solenoid valve (2) then makes it possible to close or open the internal volume (3) of the injector (1), so as to allow the increase of the pressure inside its internal volume (3), or the admission of fuel to be compressed.
  • a second solenoid valve (6) makes it possible to lock the displacement of a needle (7) whose displacement makes it possible to release an orifice (9) allowing injection.
  • the locking of the position of the needle (7) is obtained by realizing or not a pressure difference between the two ends of the needle (7).
  • a return means (8) then makes it possible to return the needle (7) to its closed position.
  • a capacitor (11) makes it possible to store fuel under pressure so as to allow injection into one or more secondary phases. In this way, it is then possible to inject at times very far from the main injection either by anticipation or with delay.
  • the two solenoid valves (2, 6) are of the mono-stable type because they comprise an elastic return means to allow them to return to the deactivated state once the supply has been cut off.
  • These solenoid valves (2, 6) may in particular comprise two states and three channels.
  • the solenoid valve (2) the internal volume (3) of the injector (1) either at the pressure of the supply circuit (16) or at the pressure P compressed fuel contained in the capacity (11).
  • the solenoid valve (6) either the two ends of the needle (7) are at the pressure contained in the internal volume (3) of the injector (1), or an end at the pressure contained in the internal volume (3) and the other at the pressure contained in the supply circuit (16).
  • a filling pipe (15) comprises a non-return means (10), so as to allow circulation in this filling pipe (15) only in one direction, namely in the direction of the internal volume (3) up to capacity (11).
  • a second non-return means (12) is attached to an injection pipe (14) so as to allow the circulation of the pressurized fuel only in one direction, namely the direction of the capacity (11) to the internal volume (3) of the injector (1).
  • the non-return means (10) comprises a member (13) which is in the form of a resilient member of the spring type. In this way, the circulation of the fuel inside this filling pipe (15) is only possible when the pressure difference between the two orifices of the non-return valve (10) exceeds a predetermined threshold value.
  • this pipe (15) has a non-return means (10) to circulate the fuel in one direction.
  • this non-return means (10) may comprise an elastic member (13) to allow the flow of fuel in this pipe (15) when the fuel pressure P exceeds a predetermined threshold value.
  • the pressurized fuel contained in the capacity (11) then fills the internal volume (3) of the injector (1) through an injection pipe (14) which has a non-return means (12). Therefore, within this pipe (14), the fuel can flow in one direction, that of the capacity (11) to the internal volume (3).
  • This technique therefore makes it possible to inject fuel at times very far from the main injection phase, corresponding substantially to the top dead center of the piston inside the cylinder in question.
  • the pump injector can be assembled from a number of sections (20, 21, 22, 23, 24, 25), in order to facilitate its design and the realization of the various pipes present inside its volume internal (3).
  • the capacity (11) can for example be straddling between several sections (24, 25) and be made by a recess opening in several sections.
  • the anti-return means (10, 12) are obtained by means of balls, able to move inside a housing. The displacement of these balls makes it possible to obstruct or not an orifice and then prohibits the flow of fuel inside this pipe.
  • the fuel injection is represented by the curve D9, corresponding to the flow of fuel flowing through the orifices (9).
  • the curves P3 and P11 respectively correspond to the fuel pressure inside the internal volume (3) of the injector (1) and inside the capacity (11).

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Jet Pumps And Other Pumps (AREA)

Claims (2)

  1. Injektor-Pumpe-System (1), das dazu bestimmt ist, Kraftstoff zu komprimieren, ihn dann während einer Haupteinspritzphase in das Innere der Brennkammer (18) eines Zylinders eines Verbrennungsmotors einzuspritzen, wobei das Injektor-Pumpe-System (1) Folgendes aufweist:
    • eine Nadel (7), deren Verlagerung durch ein erstes Elektroventil (6) so gesteuert wird, dass die Einspritzung des im Eigenvolumen (3) des Injektor-Pumpe-Systems (1) enthaltenen Kraftstoffs zugelassen wird;
    • einen Fassungsraum (11), der dazu bestimmt ist, eine unter Druck stehende Kraftstoffmenge vorzuhalten;
    dadurch gekennzeichnet, dass es auch aufweist:
    • ein zweites Elektroventil (2), das dazu ausgelegt ist, den Fassungsraum (11) mit dem Eigenvolumen (3) des Injektors (1) in Verbindung zu setzen, um eine sekundäre Einspritzphase zuzulassen, wobei das zweite Elektroventil (2) mit dem ersten Elektroventil (6) während der Haupteinspritzphase und der sekundären Einspritzphase gleichzeitig betätigt wird;
    • eine Füllungsrücklaufsperreinrichtung (10), die im Bereich einer Füllungsrohrleitung (15) eingerichtet ist, die dazu bestimmt ist, die Füllung des Fassungsraums (11) mit unter Druck stehendem Kraftstoff zuzulassen, wobei die Rücklaufsperreinrichtung (10) dazu ausgelegt ist, das Fließen des Kraftstoffs in einer einzigen Richtung vom Eigenvolumen (3) zum Fassungsraum (11) zuzulassen, und ein Glied (13) umfasst, um das Fließen des Kraftstoffs zuzulassen, wenn der Druckunterschied zwischen dem Eigenvolumen (3) und dem Fassungsraum (11) bei der Haupteinspritzphase einen vorbestimmten Schwellenwert übersteigt, der höher ist als der Druck im Inneren des Injektors.
  2. Injektor-Pumpe-System nach Anspruch 1, dadurch gekennzeichnet, dass es im Bereich einer Einspritzrohrleitung (14), die dazu bestimmt ist, den Fassungsraum (11) mit dem Eigenvolumen (3) in Verbindung stehen zu lassen, eine Einspritzrücklaufsperreinrichtung (12) aufweist, die dazu ausgelegt ist, das Fließen des Kraftstoffs in einer einzigen Richtung vom Fassungsraum (11) zum Eigenvolumen (3) zuzulassen.
EP05766704A 2004-06-04 2005-05-27 Pumpendüse Not-in-force EP1751421B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0451112A FR2871197B1 (fr) 2004-06-04 2004-06-04 Injecteur pompe
PCT/FR2005/050382 WO2005124144A1 (fr) 2004-06-04 2005-05-27 Injecteur pompe

Publications (2)

Publication Number Publication Date
EP1751421A1 EP1751421A1 (de) 2007-02-14
EP1751421B1 true EP1751421B1 (de) 2009-05-13

Family

ID=34947290

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05766704A Not-in-force EP1751421B1 (de) 2004-06-04 2005-05-27 Pumpendüse

Country Status (5)

Country Link
EP (1) EP1751421B1 (de)
AT (1) ATE431499T1 (de)
DE (1) DE602005014469D1 (de)
FR (1) FR2871197B1 (de)
WO (1) WO2005124144A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0614537D0 (en) * 2006-07-21 2006-08-30 Delphi Tech Inc Fuel Injection System
CN108488016A (zh) * 2018-05-07 2018-09-04 长沙燕通生物科技有限公司 可缓解柴油机启动冒黑烟的装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0641931A1 (de) * 1993-09-06 1995-03-08 Servojet Electronic Systems, Ltd. Speicher-Kraffstoffeinspritzsystem
GB9821929D0 (en) * 1998-10-09 1998-12-02 Lucas Ind Plc Fuel system
DE19939419A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
DE19939429A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
DE10132732A1 (de) * 2001-07-05 2003-01-23 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
US6439202B1 (en) * 2001-11-08 2002-08-27 Cummins Inc. Hybrid electronically controlled unit injector fuel system
DE10158659A1 (de) * 2001-11-30 2003-06-12 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
GB2394001B (en) * 2001-12-03 2004-06-16 Daimler Chrysler Ag Injection system operating with pressure intensification

Also Published As

Publication number Publication date
FR2871197A1 (fr) 2005-12-09
EP1751421A1 (de) 2007-02-14
DE602005014469D1 (de) 2009-06-25
WO2005124144A1 (fr) 2005-12-29
FR2871197B1 (fr) 2006-07-28
ATE431499T1 (de) 2009-05-15

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