EP1353058A2 - Carburateur pour moteurs a essence avec buse de combustible réglable - Google Patents

Carburateur pour moteurs a essence avec buse de combustible réglable Download PDF

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Publication number
EP1353058A2
EP1353058A2 EP03006885A EP03006885A EP1353058A2 EP 1353058 A2 EP1353058 A2 EP 1353058A2 EP 03006885 A EP03006885 A EP 03006885A EP 03006885 A EP03006885 A EP 03006885A EP 1353058 A2 EP1353058 A2 EP 1353058A2
Authority
EP
European Patent Office
Prior art keywords
actuator
fuel
carburetor
engine according
otto engine
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
EP03006885A
Other languages
German (de)
English (en)
Other versions
EP1353058B1 (fr
EP1353058A3 (fr
Inventor
Norbert Dr.-Ing. Adolph
Martin Dr.-Ing. Düsterhöft
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.)
Vemac & Cokg GmbH
Original Assignee
Vemac & Cokg GmbH
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 Vemac & Cokg GmbH filed Critical Vemac & Cokg GmbH
Publication of EP1353058A2 publication Critical patent/EP1353058A2/fr
Publication of EP1353058A3 publication Critical patent/EP1353058A3/fr
Application granted granted Critical
Publication of EP1353058B1 publication Critical patent/EP1353058B1/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
    • F02M17/00—Carburettors having pertinent characteristics not provided for in, or of interest apart from, the apparatus of preceding main groups F02M1/00 - F02M15/00
    • F02M17/14—Carburettors with fuel-supply parts opened and closed in synchronism with engine stroke ; Valve carburettors
    • F02M17/147—Valve carburettor with simultaneous air and fuel control

Definitions

  • the invention relates to a carburetor for an Otto engine with a Air funnel for sucking fuel from a mouth opening into the air funnel Fuel line.
  • the fuel line is connected to a fuel chamber and has between the fuel chamber and its mouth in the air funnel Fuel nozzle for adjusting a due to negative pressure in the air funnel from the Amount of fuel that can be drawn into the fuel chamber.
  • Carburettors in which the fuel-air mixture required for the operation of Otto engines generated by drawing in fuel and mixing with air for setting an operationally necessary variable fuel-air mixture only imperfectly suited. Especially with regard to performance adjustment and Fuel consumption, but also with regard to increasing demands on low values Harmful exhaust gas emissions are classified as non-optimizable
  • carburetors instead of carburetors, they are usually used for internal combustion engines elaborate injection systems used for mixture preparation.
  • injection systems used for mixture preparation.
  • small engines especially for driving small motorcycles, chainsaws or garden tools such as For example, lawn mowers, however, become simple and easy to handle Drive devices sought. It is essential to set them to the specified ones Exhaust emission limits.
  • the object of the invention is to provide a flexible engine power required customizable carburettor to create low harmful requirements Exhaust emissions fulfilled and moreover without significant energy loss can be operated for the entire system.
  • the fuel nozzle has one flow cross-section that can be changed by means of a piezoelectric actuator.
  • the flow cross section can be very sensitive to adjust.
  • the actuator reacts immediately to changing control values Energy consumption is low. Compared to all mechanical installations, this is both Weight and space requirements are negligible.
  • the in is particularly advantageous Relation with small engines given operational safety as well as for the Easy installation and removal for users.
  • the piezoelectric actuator can be used as a bending transducer or as a piezoelectric Be formed membrane, can be used to adjust the flow cross-section advantageously also an actuator effective in the axial direction, a longitudinal or also a transverse actuator can be used, claims 2, 3 and 4.
  • Such Actuators can be used directly as calibratable throttle elements for the Use fuel nozzles.
  • the piezoelectric actuator with an actuator for setting the Flow cross section connected, claim 5. This makes it possible, if necessary too little movement of the piezoelectric actuator due to an intermediate Enlarging translation element, claim 6.
  • FIG. 1 schematically shows a carburetor with an air funnel 1 and a pivotable throttle valve 2 arranged in the air funnel, via which the intake pressure for the fuel introduced from the fuel line 3 into the air funnel is controlled.
  • the fuel emerging from the fuel line 3 at its mouth 4 into the air funnel 1 is atomized.
  • a fuel nozzle 7 is inserted in the fuel line between the mouth 4 and a fuel chamber 5, which in the exemplary embodiment is filled with fuel from a fuel tank (not shown in FIG. 1) via a needle valve 6.
  • the fuel mass flow in the carburetor is influenced by the fuel nozzle.
  • the flow cross section of the fuel nozzle 7 can be calibrated.
  • the actuator is operatively connected to an actuator 10 which changes the flow cross section of the fuel nozzle 7.
  • the voltage generator 9 is controlled by a predetermined exhaust gas lambda value.
  • the exhaust gas composition is measured by a correspondingly suitable lambda sensor 11, which converts its measured value into an electrical signal and connects it to an electronic controller, in the exemplary embodiment a PID controller 12.
  • the starting point is the load requirement for the engine, which is specified as a reference variable for adjusting the fuel nozzle.
  • the exhaust gas mixture generated in this setting is analyzed by sensor 11 and leads via PID controller 12 to a setting correction for the amount of fuel to be supplied to the carburetor.
  • the fuel mass flow is thus regulated as a function of a predetermined exhaust gas composition to be observed.
  • FIG. 2 An embodiment of a piezoelectric actuator for setting a Actuator of a fuel nozzle is shown schematically in Figure 2.
  • a bending transducer 13 As an actuator a bending transducer 13 is used. The bending transducer is on one side in a fixed bearing 14 clamped and bimorph: two voltage sensors 15 are connected to each other adhering piezo elements 16a, 16b connected, which with a corresponding electrical activation of their ceramic layers at their free end around that Bend the fixed bearing 14 in the same way as a leaf spring in the direction 17.
  • the bending transducer controls an actuator in a throttle 18 to change it Flow cross-section 19 a conical nozzle needle 20 movable in the throttle having.
  • the nozzle needle is attached to the free end of the piezo element 16a.
  • the bending transducer 13 bends in such a way that the nozzle needle 20 is pressed into the throttle 18 and the Flow cross section 19 reduced.
  • an electrical potential that is positive with respect to the piezo element 16b so the nozzle needle 20 is lifted out of the throttle 18 and thus increases the Flow cross-section 19.
  • the bending transducer can be very much from the voltage generator adjust sensitively so that with appropriate training of the nozzle needle Fuel mass flow can be precisely adjusted to the required conditions.
  • a nozzle needle 24 is attached to one of the two piezo elements 25a, 25b of the Bending transducer 21 attached centrally, in the exemplary embodiment on the piezo element 25a, and can be applied by applying variable voltages to the piezo elements a tension transmitter 26 and the bulge of the bending transducer 21 caused thereby move in a throttle 27 to adjust its flow cross section 28.
  • the in The area of the flow cross section of the conical nozzle needle 24 is in the throttle guided radially in a slide bearing 29 and by means of a spring-damper system 30 secured against axial vibrations.
  • a spring-damper system 30 secured against axial vibrations.
  • a piezoelectric membrane 33 is used as the bending transducer, which acts on its circular membrane edge is clamped in a ring bearing 34 and their Bulge in the same way as in the embodiment of Figure 3 of one Voltage generator 35 is controlled.
  • the nozzle needle 36 is in the Throttle 37 guided radially in a slide bearing 39.
  • the clamped in the ring bearing piezoelectric membrane and the radial nozzle needle stabilize the mechanical structure for a fuel nozzle according to the invention piezoelectric actuator and calibratable actuator.
  • FIG. 5 shows an embodiment with a monomorph actuator: on Piezo element 40 is rigid on a spring plate 41 (spiral spring or plate spring) attached, in the embodiment, the piezo element to relieve it on the Spring plate glued on.
  • the spring plate 41 rests in the housing 42 in its edge region Bearings 43.
  • the bulge Piezo element 40 and with it the spring plate 41 so that a nozzle needle 44 moves becomes.
  • the nozzle needle is a mechanical one Membrane 45 performed in the housing 42 at its circular membrane edge a fixed bearing 46 is clamped.
  • the nozzle needle is such on the membrane attached that they due to the fuel pressure in the fuel chamber 47 of the Fuel nozzle rests non-positively on the surface of the bearing plate 41 and at bulging of the bearing plate due to activation of the piezo element both to close a throttle opening 48 and to open it is moving.
  • the mechanical one that guides the nozzle needle is used Membrane 45 at the same time to seal the fuel leading area of the Fuel nozzle with fuel inlet 49 and fuel outlet 50 from the Housing area in which the piezoelectric actuator is used.
  • the Piezoelectric actuator does not come into contact with fuel.
  • Figure 6 shows schematically an embodiment for the use of an axial Actuator 51.
  • an axial actuator is both a longitudinal and a Transversal actuator can be used.
  • the axial actuator is as Multilayer actuator with piezo layers 52 executed, but it can of course also an actuator stack with piezo elements glued together use.
  • the axial actuator expands in the direction when voltage is applied its axis 53.
  • a nozzle needle 54 is in the axial direction arranged, which is guided radially in a plain bearing 55 and by a spring element 56 is pressed non-positively against the actuator 51.
  • the axial actuator is closed its mechanical preload is surrounded by a tubular spring 57, which is the actuator axially clamped.
  • FIG. 7 shows a variant for a fuel nozzle according to the invention with a piezoelectric actuator for setting a nozzle needle, in which components of the exemplary embodiments according to FIGS. 5 and 6 are adopted.
  • An axial actuator 58 is again used as the actuator and a nozzle needle 60 guided by a mechanical membrane 59 is used.
  • an articulated lever 61 which is arranged between actuator 58 and nozzle needle 60, serves to move the nozzle needle in such a way that the axial extension of the actuator package can be enlarged.
  • the articulated lever 61 is pivotally fastened in the housing 62, in the exemplary embodiment in a solid body joint formed by a leaf spring 63, and non-positively connected to the axial actuator 58 and the nozzle needle 60, the point of engagement for the actuator 58 on the articulated lever 61 to the fixed point of the leaf spring 62 has a shorter distance 64 than the point of application of the nozzle needle 60 on the articulated lever with a distance 65.
  • the axial extension of the actuator 58 is thus translated according to the length ratio of distance 64 to distance 65.
  • the frictional connection between the nozzle needle 60 and the articulated lever 61 is supported in the exemplary embodiment by a spring element 66.
  • FIG. 8 shows an embodiment with a hydraulic displacement amplifier.
  • the fuel nozzle has an axial movable nozzle needle 67, the one in their axial movement Flow cross section 68 between fuel inlet 69 and fuel outlet 70 changed.
  • the nozzle needle 67 is on the nozzle shaft 71 in a slide bearing 72 in Housing 73 of the fuel nozzle guided radially and in the "position" shown in FIG. the fuel nozzle is held by a mechanical spring 74 which the Nozzle needle against a stop ring 75 attached to the nozzle shaft 71 Housing 73 presses.
  • the free end of the nozzle shaft 71 in the slide bearing 72 stands with a fuel-filled pressure chamber 76 in connection, the pressure of which piezoelectric actuator, again an axial actuator 77 in the exemplary embodiment certainly.
  • the actuator used for its axial movement on a voltage sensor 78 is connected, is protected by a corrugated tube-like protective cover 79 Surround actuator before touching fuel.
  • With the actuator 77 is a Piston 80 connected to be moved against a spring element 81 which in Housing 73 is clamped in a fixed bearing 82 and is non-positively on Piston base 83 of the piston 80 is supported.
  • the spring element 81 is used for Biasing of the actuator 77.
  • the spring element 81 is designed such that the Fuel that from the fuel inlet 69 in the Dryck space 76 penetrates, the pressure space completely fills, in the embodiment the spring element for the flow of fuel has openings 85.
  • the exemplary embodiment according to FIG. 9 shows an axial actuator 86 which is between is inserted two leaf spring-like clamps 87 so that in an axial Elongation or shortening of the actuator changes the deflection of the bracket 87.
  • the axial movement of the actuator 86 is thus directed perpendicular to it Radial movement of the bracket 87 is transformed, the expansion of the Actuator can also influence quantitatively, in the embodiment, the axial Expansion in the radial direction increased.
  • One of the brackets is a non-positive one Nozzle needle 88 in contact, which in the case of an increase or decrease in the Bow deflection in their slide bearing 89 is shifted and - in the same As in all previous embodiments - one Flow cross section 90 of a throttle 91 changed.
  • a nozzle needle on the resilient bracket 87 facing it serves at the foot 92 of the Nozzle needle 88 engaging spring element 93.
  • FIG. 10 shows an axial actuator 94, which has a cross-section when moving axially a fuel line 95 changed.
  • the line consists of an elastic Pipe material that allows the flow cross section of the line in Dependent on the adjustable or shortening of the actuator to change reproducibly.
  • Pipe materials suitable for fuels such resilient movement have as little or no hysteresis for example plastics such as Viton or Peek, or metals such as stainless steel or Spring bronze.
  • FIG. 11 shows a further variant of the invention a piezoelectric bending transducer 96 is again used as the piezoelectric actuator, that within a fuel line 97 with a rectangular line cross-section 98 for Formation of a fuel nozzle is arranged. Via a voltage generator 99 can the bending transducer deform so that the flow cross section of the Fuel line 97 changed and the desired amount of fuel is reached.
  • a calibratable is used to form Fuel nozzle in a fuel line 100 with a rectangular line cross section 101 and a throttle point 102, which is formed by wall reinforcements 103, which Narrowing the flow cross section of the fuel line 100, an axial actuator 104 used.
  • the actuator is inserted in the wall reinforcements 103 and with a Voltage transmitter 105 connected.
  • the actuator 104 itself serves as a throttling device, with axial expansion of the actuator, the flow cross-section becomes the throttle point 102 is reduced.
  • the maximum change in length of the actuator is in Figure 12 schematically indicated by dashed lines.
  • a fuel nozzle with piezoelectric, which also requires little effort Actuator for regulating the throttle point is shown in FIG. 13.
  • a bending transducer 106 which is located in a space 107 between the fuel inlet 108 and fuel outlet 109 on both sides in bearings 110 in the exemplary embodiment is braced that the bending transducer in the rest position the access cross section 111 to Fuel drain 109 is closed. If the bending transducer 106 from Activated voltage generator 112, it opens the access cross-section for the passage of required amount of fuel.
  • the bending transducer can also be used in such a way that the access cross-section is open in the rest position of the bending transducer. to The bending transducer is then influenced by the fuel mass flow Activation in the closing direction - towards the access cross-section of the fuel outlet - emotional.

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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)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
EP03006885A 2002-04-11 2003-03-31 Carburateur pour moteurs a essence avec buse de combustible réglable Expired - Lifetime EP1353058B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10216084A DE10216084A1 (de) 2002-04-11 2002-04-11 Vergaser für Otto-Motor mit einstellbarer Brennstoffdüse
DE10216084 2002-04-11

Publications (3)

Publication Number Publication Date
EP1353058A2 true EP1353058A2 (fr) 2003-10-15
EP1353058A3 EP1353058A3 (fr) 2004-01-21
EP1353058B1 EP1353058B1 (fr) 2005-11-09

Family

ID=28051261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03006885A Expired - Lifetime EP1353058B1 (fr) 2002-04-11 2003-03-31 Carburateur pour moteurs a essence avec buse de combustible réglable

Country Status (3)

Country Link
EP (1) EP1353058B1 (fr)
AT (1) ATE309459T1 (fr)
DE (2) DE10216084A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7509941B2 (en) 2006-03-08 2009-03-31 Phelon Euro Ab Apparatus and method for adjusting air-to-fuel ratio for small gasoline engine
WO2010136199A1 (fr) * 2009-05-27 2010-12-02 Makita Corporation Carburateur commandé électriquement
US8622031B2 (en) 2010-01-12 2014-01-07 Walbro Engine Management, L.L.C. System for supplementary fuel supply

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019217720A1 (de) * 2019-11-18 2021-05-20 Elringklinger Ag Treibdüse und Strahlpumpe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1905634A1 (de) * 1969-02-05 1970-08-20 Messerschmitt Boelkow Blohm Duese mit veraenderbarem Querschnitt
US3919989A (en) * 1973-05-12 1975-11-18 Cav Ltd Fuel injection pumping apparatus
GB2041500A (en) * 1979-01-31 1980-09-10 Aisan Ind Fuel control valve for use with an internal combustion engine
DE19913073A1 (de) * 1999-03-23 2000-10-05 Wacker Werke Kg Kraftstoff-Dosiervorrichtung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3028091C2 (de) * 1979-08-02 1985-09-12 Fuji Jukogyo K.K., Tokio/Tokyo Luftbrennstoffverhältnisregelsystem für einen Verbrennungsmotor
JPS6210463A (ja) * 1985-07-05 1987-01-19 Mikuni Kogyo Co Ltd 混合気供給装置の燃料系
DE3813837A1 (de) * 1988-04-23 1989-11-02 Licentia Gmbh Multifunktionale dreidimensionale schaltung
DE19607165A1 (de) * 1996-02-26 1997-08-28 Christian Fallert Nachrüstsatz zur geregelten Katalyse von Motorabgasen
IT1310126B1 (it) * 1999-07-20 2002-02-11 Fiat Ricerche Attuatore piezoelettrico per l'iniezione di carburante

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1905634A1 (de) * 1969-02-05 1970-08-20 Messerschmitt Boelkow Blohm Duese mit veraenderbarem Querschnitt
US3919989A (en) * 1973-05-12 1975-11-18 Cav Ltd Fuel injection pumping apparatus
GB2041500A (en) * 1979-01-31 1980-09-10 Aisan Ind Fuel control valve for use with an internal combustion engine
DE19913073A1 (de) * 1999-03-23 2000-10-05 Wacker Werke Kg Kraftstoff-Dosiervorrichtung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7509941B2 (en) 2006-03-08 2009-03-31 Phelon Euro Ab Apparatus and method for adjusting air-to-fuel ratio for small gasoline engine
WO2010136199A1 (fr) * 2009-05-27 2010-12-02 Makita Corporation Carburateur commandé électriquement
CN102449289A (zh) * 2009-05-27 2012-05-09 株式会社牧田 电动化油器
US8894043B2 (en) 2009-05-27 2014-11-25 Makita Corporation Electrically activated carburettor
US8622031B2 (en) 2010-01-12 2014-01-07 Walbro Engine Management, L.L.C. System for supplementary fuel supply

Also Published As

Publication number Publication date
ATE309459T1 (de) 2005-11-15
EP1353058B1 (fr) 2005-11-09
DE10216084A1 (de) 2003-10-30
DE50301584D1 (de) 2005-12-15
EP1353058A3 (fr) 2004-01-21

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