EP0731271A2 - Dispositif pour introduire du combustible dans la chambre de combustion d'un moteur à combustion interne - Google Patents

Dispositif pour introduire du combustible dans la chambre de combustion d'un moteur à combustion interne Download PDF

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Publication number
EP0731271A2
EP0731271A2 EP96890011A EP96890011A EP0731271A2 EP 0731271 A2 EP0731271 A2 EP 0731271A2 EP 96890011 A EP96890011 A EP 96890011A EP 96890011 A EP96890011 A EP 96890011A EP 0731271 A2 EP0731271 A2 EP 0731271A2
Authority
EP
European Patent Office
Prior art keywords
valve
mixing chamber
fuel
gas
chamber
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.)
Granted
Application number
EP96890011A
Other languages
German (de)
English (en)
Other versions
EP0731271A3 (fr
EP0731271B1 (fr
Inventor
Walter Dr. Piock
Martin Dr. Ing. Dipl.-Ing. Wirth
Günther K Dipl.-Ing. Dr. Fraidl
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.)
AVL List GmbH
Original Assignee
AVL List GmbH
AVL Gesellschaft fuer Verbrennungskraftmaschinen und Messtechnik mbH
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 AVL List GmbH, AVL Gesellschaft fuer Verbrennungskraftmaschinen und Messtechnik mbH filed Critical AVL List GmbH
Publication of EP0731271A2 publication Critical patent/EP0731271A2/fr
Publication of EP0731271A3 publication Critical patent/EP0731271A3/fr
Application granted granted Critical
Publication of EP0731271B1 publication Critical patent/EP0731271B1/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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D7/00—Other fuel-injection control
    • F02D7/02—Controlling fuel injection where fuel is injected by compressed air
    • 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
    • F02M47/04—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure using fluid, other than fuel, for injection-valve actuation
    • F02M47/046—Fluid pressure acting on injection-valve in the period of injection to open it
    • 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
    • F02M67/00—Apparatus in which fuel-injection is effected by means of high-pressure gas, the gas carrying the fuel into working cylinders of the engine, e.g. air-injection type
    • F02M67/02—Apparatus in which fuel-injection is effected by means of high-pressure gas, the gas carrying the fuel into working cylinders of the engine, e.g. air-injection type the gas being compressed air, e.g. compressed in pumps
    • F02M67/04—Apparatus in which fuel-injection is effected by means of high-pressure gas, the gas carrying the fuel into working cylinders of the engine, e.g. air-injection type the gas being compressed air, e.g. compressed in pumps the air being extracted from working cylinders of the engine

Definitions

  • the invention relates to a device for introducing fuel into the combustion chamber of an internal combustion engine with a delivery device for the fuel, an injection valve for removing compressed gas from the cylinder and for blowing the gas and the delivered fuel into the cylinder, with a valve-side mixing chamber for storage of the gas, the injection valve having a valve for controlling the gas exchange between the combustion chamber and the mixing chamber on the valve side.
  • a device of the type mentioned is known, with which compressed gas is removed from the cylinder during one working cycle, temporarily stored and blown into the cylinder together with the fuel in the following working cycle, the removal of a small amount being called Gas from the cylinder is timed via a valve opening into the combustion chamber of the cylinder. Fuel is injected into the extracted hot gas stored in the valve chamber of the valve, whereby an essentially homogeneous gas-fuel mixture is achieved. Finally, the stored fuel-gas mixture is blown into the cylinder through the valve opening into the cylinder in the subsequent working cycle. According to an embodiment variant of the known device, it is known to change the injection duration and the injection quantity, in particular independently of one another, as a function of engine operating parameters.
  • the injection valve With the same engine operating parameters, i.e. with the same load, speed, etc., the injection valve always opens and closes at a specific crankshaft position.
  • this has the disadvantage that the closing time of the valve must be selected so that even in the worst case no combustion can take place in the mixing room, since this would lead to coking.
  • it is desirable to close the valve late during the compression phase. Due to the spatial distance between the ignition source and the injection valve, a considerably later closing time than the ignition time is possible due to the flame spread.
  • the object of the present invention is to avoid these disadvantages and to enable constant, reproducible operating conditions in a device of the type mentioned.
  • the mixing chamber is in operative connection with at least one sensor element for measuring the pressure and / or the temperature of the mixing chamber and the valve is closed as a function of at least the physical variable measured by the at least one sensor element. It is preferably provided that the sensor element is connected to an electronic control unit which supplies a closing signal generated as a function of the measured size to a hydraulic, pneumatic or electromagnetic valve actuation device.
  • the closing time of the injection valve is determined directly by the physical conditions in the mixing room, such as temperature and / or pressure. As high a pressure as possible can be realized in the mixing room, which is subject to very small cyclical fluctuations.
  • the closing time is set so that there can be no combustion in the mixing chamber.
  • the reasonably possible closing time can be determined by a characteristic pressure or temperature specification. According to the present invention, this variable is used as a control or manipulated variable in order to realize the latest possible closing time of the valve without the flame entering the mixing chamber, similar to a knock control of the ignition timing, and thus to store the respective highest possible pressure in the mixing chamber.
  • an injection valve 1 of an internal combustion engine is shown schematically. With 2 it is Cylinder head, indicated by the reference numeral 3, a cylinder of the internal combustion engine.
  • a valve 5 is slidably mounted in the valve housing 4 of the injection valve 1.
  • the valve 5 is actuated by a hydraulic actuation device 6, for example.
  • the actuating device 6 can also be pneumatic or electrical.
  • an actuating piston 7 of the valve 5 is pressurized with hydraulic pressure in the pressure chamber 8 against the force of a spring 9, whereby the valve 5 is deflected into the open position. When the pressure is released, the valve 5 is brought into the closed position by the spring 9.
  • a hydraulic line 10 leads into the pressure chamber 8 and can be connected to a pump 12 or the like via a switching valve 11. In a second position of the switching valve 11, the pressure chamber 8 can be relieved via the relief line 13.
  • the switching valve 11 is actuated via an electronic control unit ECU.
  • a mixing chamber 14 Arranged within the valve housing 4 is a mixing chamber 14 which, in the open position of the valve 5, is flow-connected to the combustion chamber 21 of the internal combustion engine.
  • a fuel flow path 15 opens into the mixing chamber 14, via which fuel can be injected into the mixing chamber 14.
  • the fuel supply system is indicated by the fuel tank 16, the fuel delivery device 17, a fuel valve 18 and the line 15.
  • a temperature sensor 19 and / or a pressure sensor 20 is provided, the data of which are supplied to the control unit ECU.
  • the cylinder pressure p 1 indicated by the line A and the pressure p 2 symbolized by the line B in the mixing chamber 14 are plotted over the crank angle KW.
  • the arrow C indicates the ignition point in the area of the top dead center OT.
  • the reference symbol UT stands for bottom dead center.
  • the blowing-in phase of the blowing-in valve 1 is indicated by the reference symbol D, the reference symbol D 0 marking the opening point and E 0 the closing point of the blowing-in valve 1.
  • the valve 5 is opened and discharges the contents of the mixing chamber 14 into the combustion chamber 21 within the cylinder 3.
  • the recharging phase E of the blowing valve 1 follows, during which gas flows into the mixing chamber 14 as the combustion chamber pressure increases.
  • the recharging phase E must have ended before combustion takes place within the mixing space 14.
  • the mixing chamber 14 is discharged again in the following cycle during the blowing phase D.
  • the injection valve thus remains open during the injection phase D and the recharge phase E.
  • the closing time D 0 of the injection valve 4 is as late as possible.
  • the closing time D 0 must not take place too late in order to reliably exclude combustion in the mixing room 14.
  • at least one temperature sensor 19 and / or a pressure sensor 20 is provided for monitoring the temperature and / or the pressure within the mixing space 14, as shown in FIG. 1.

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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP96890011A 1995-02-27 1996-01-23 Dispositif pour introduire du combustible dans la chambre de combustion d'un moteur à combustion interne Expired - Lifetime EP0731271B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT353/95 1995-02-27
AT0035395A AT408137B (de) 1995-02-27 1995-02-27 Einrichtung zum einbringen von kraftstoff in den brennraum einer brennkraftmaschine

Publications (3)

Publication Number Publication Date
EP0731271A2 true EP0731271A2 (fr) 1996-09-11
EP0731271A3 EP0731271A3 (fr) 1996-10-30
EP0731271B1 EP0731271B1 (fr) 1998-03-25

Family

ID=3488370

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96890011A Expired - Lifetime EP0731271B1 (fr) 1995-02-27 1996-01-23 Dispositif pour introduire du combustible dans la chambre de combustion d'un moteur à combustion interne

Country Status (4)

Country Link
US (1) US5647336A (fr)
EP (1) EP0731271B1 (fr)
AT (1) AT408137B (fr)
DE (1) DE59600120D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030012985A1 (en) 1998-08-03 2003-01-16 Mcalister Roy E. Pressure energy conversion systems
AT7202U1 (de) * 2002-12-19 2004-11-25 Avl List Gmbh Verfahren zum betreiben einer mit gas betriebenen brennkraftmaschine
CA2798870C (fr) 2012-12-17 2014-07-22 Westport Power Inc. Injection directe de carburant gazeux enrichi a l'air pour un moteur a combustion interne
WO2014144581A1 (fr) 2013-03-15 2014-09-18 Mcalister Technologies, Llc Moteur à combustion interne et systèmes et procédés associés
US9255560B2 (en) * 2013-03-15 2016-02-09 Mcalister Technologies, Llc Regenerative intensifier and associated systems and methods

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3872217D1 (de) * 1987-08-12 1992-07-23 Avl Verbrennungskraft Messtech Einrichtung zur einbringung des kraftstoffes in den brennraum einer brennkraftmaschine.
US4944277A (en) * 1989-03-03 1990-07-31 Outboard Marine Corporation Cylinder entrapment system with an air spring
AT407428B (de) * 1989-04-12 2001-03-26 Avl Verbrennungskraft Messtech Hydraulisch betätigbares ventil mit steuerbarem hub
AT408256B (de) * 1989-07-31 2001-10-25 Avl Verbrennungskraft Messtech Vorrichtung zum einbringen von kraftstoff in den brennraum einer brennkraftmaschine
CA2159608C (fr) * 1993-04-29 2004-06-22 Nicholas John Ellwood Moteur a combustion interne a injection de carburant
AT408138B (de) * 1995-02-23 2001-09-25 Avl Verbrennungskraft Messtech Einrichtung zum einbringen von kraftstoff in den brennraum einer brennkraftmaschine

Also Published As

Publication number Publication date
US5647336A (en) 1997-07-15
EP0731271A3 (fr) 1996-10-30
EP0731271B1 (fr) 1998-03-25
DE59600120D1 (de) 1998-04-30
ATA35395A (de) 2001-01-15
AT408137B (de) 2001-09-25

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