EP0297670A2 - Gesteuerte Zündungs- und Zuspeisungsvorrichtung bei einer Brennkraftmaschine - Google Patents

Gesteuerte Zündungs- und Zuspeisungsvorrichtung bei einer Brennkraftmaschine Download PDF

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Publication number
EP0297670A2
EP0297670A2 EP88201325A EP88201325A EP0297670A2 EP 0297670 A2 EP0297670 A2 EP 0297670A2 EP 88201325 A EP88201325 A EP 88201325A EP 88201325 A EP88201325 A EP 88201325A EP 0297670 A2 EP0297670 A2 EP 0297670A2
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EP
European Patent Office
Prior art keywords
engine
duct
section
ignition
feed duct
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.)
Withdrawn
Application number
EP88201325A
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English (en)
French (fr)
Other versions
EP0297670A3 (de
Inventor
Aroldo Trivelli
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.)
Morini Franco Motori SpA
Original Assignee
Morini Franco Motori SpA
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 Morini Franco Motori SpA filed Critical Morini Franco Motori SpA
Publication of EP0297670A2 publication Critical patent/EP0297670A2/de
Publication of EP0297670A3 publication Critical patent/EP0297670A3/de
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F02P5/045—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions combined with electronic control of other engine functions, e.g. fuel injection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • 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
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/12—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves
    • F02M7/18—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel-metering orifice
    • F02M7/20—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel-metering orifice operated automatically, e.g. dependent on altitude
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D2011/101—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles
    • F02D2011/102—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles at least one throttle being moved only by an electric actuator

Definitions

  • the subject of the present invention is a controlled feed and ignition device for internal combusion engines.
  • Internal combusion engines are usually equipped with a device for feeding fuel and combustion supporter, usually air, mixed in the required propor­tions for achieving optimum combustion in the cylinder or cylinders of said engine.
  • Said device is often composed of a carburettor, in which there is present, basically, a duct equipped with a zone of restricted cross-section, where the passage of the air, drawn in by the vacuum generated in the cylinder or cylinders, determines a suction of fuel through an associated duct, which fuel thus becomes mixed and finely dispersed in the combustion air.
  • the air flow rate passing through the carburettor is determined by a valve for regulating the section of the air duct, and the variation in this air flow rate determines, for reasons of fluid dynamics well known in the art, a corresponding variation in the quantity of fuel drawn in; the actuation of said regulating valve, normally termed a "butterfly" valve although frequently of varying constructional types, therefore determines the total quantity of air-fuel mixture supplied to the engine, and the associated operating regime.
  • the running of the engine is influenced also by its ignition, and in par­ticular by the spark advance value of same, which can give rise, if it is inadequate, to operating irregularities and emission of high quantities of pollutant, in particular nitrogen oxides and unburnt hydrocarbons.
  • a regulation of the feed and ignition conditions may be achieved with electronic ignition and injection apparatuses, but such devices prove to be especially complex and delicate and also expensive, and therefore do not lend themselves to use in engines of small sizes, and in particular for the engines used for motor cycles. Engines intended for motor cycles, moreover, are frequently two-stroke and often run at high rotational speeds, and the known electronic injection devices are not capable of operating in optimum manner under such conditions.
  • the present invention provides a device for controlled feed and ignition for internal combustion engines, which comprises a carburettor having an air feed duct, equipped with a controll­able regulator valve and having a reduced cross-section, into which there leads a flooded fuel feed duct from a constant level chamber, in which there is present a member for varying the flow cross-section of the fuel feed duct, an electronically controllable ignition member and an electronic control unit, adapted for governing the device for varying the flow cross-­section of the fuel feed duct as a function of instantaneous operating data of the engine, the data being supplied to it from relative sensors, the electronic control unit being, moreover, adapted for acting upon the ignition member for regulating the spark advance value for the engine as a function of said instantaneous data supplied by the sensors, for the purpose of setting optimum operating conditions for said engine.
  • the member for varying the flow cross-section of the fuel feed duct is consti­tuted of a stem having a tapered end, capable of being inserted to a vari­able depth into the fuel feed duct coaxially with same, thereby determining, in cooperation with said duct, an annular flow aperture having a variable section according to the depth of insertion of said end into the duct, the stem being equipped with a controllable actuator adapted for determining its depth of insertion into the duct.
  • the controllable regulator valve for the air feed duct of the carburettor is equipped with a position transducer, generating a signal corresponding at each instant to the position of the valve, the signal being adapted to be despatched to the electronic control unit for regulating, on the basis of it and possibly also other values, the value of the flow cross-section of the fuel feed duct of the carburettor and the ignition advance value.
  • the device there is present at least one sensor for the rotational speed of the engine, generating a signal corresponding at each instant to said speed, the signal being adapted to the despatched to the electronic control unit for regulating, on the basis of it and possibly other values, the value of the flow cross-section of the fuel feed duct of the carburettor and the ignition advance value; further thoughmore, there is advantageously present a sensor for the temperature of the engine or of an important part of the engine, generating a signal corres­ponding at each instant to said temperature, this signal being adapted to be despatched to the electronic control unit for regulating, on the basis of it and possibly other values, the value of the flow cross-section of the fuel feed duct of the carburettor and the ignition advance value.
  • the electronic control unit comprises a memory unit, having recorded, in a plurality of important operating conditions of the engine, the values of the quantities detected by the sensors and of the regulated quantities, that is to say the ignition advance and flow cross-section for the fuel, in the optimum operating conditions, and a microprocessor adapted for governing, in the varying operating conditions, the setting of the values for the optimum regulated quantities memorized in correspondence with the instant-by-instant values detected by the sensors.
  • an engine for motor cycles comprises a cylinder 1, in which a piston 2 is slidable, the cylinder having a head 3 equipped with cooling and ignition devices 4, 5 respectively, mounted on an engine block 6, in which there is a flywheel 7, locked in rotation on the engine shaft.
  • the cylinder 1 is supplied from a tank 8 via a carburettor 9, is equipped with an associated intake duct 10, and possesses an exhaust duct 11.
  • the carburettor 9 is equipped with an air flow duct 12, in which there is present a regulating valve 13 for the flow rate of air sucked in, commonly known as "butterfly" valve, although it may be of a different type; said valve, as is known, is oper­ated manually for varying the speed of the engine during its use.
  • the carburettor possesses also, along the duct 12, a reduced portion of "venturi tube” type 41, into which, in the zone of maximum vacuum, there leads a fuel intake duct 15, through which said fuel is sucked for mixing with the air, the fuel being supplied from a constant level chamber 16, equipped with a float valve 17, adapted for occluding, at the predetermined level, the outlet aperture,leading into the chamber,of the fuel feed duct 18, coming from the tank 8.
  • the duct 15 is equipped with a conical needle 19, which, with its greater or lesser penetration into the duct 15, regulates the cross-section of the duct.
  • the needle 19 is associated with an actuator 20, adapted for controlling the greater or lesser insertion of the needle into the duct 15, thereby varying the pressure drop in the fuel which passes through it and therefore regulating its outflow rate under the effect of the vacuum produced in the venturi tube.
  • the position of the needle 19 is regulated on the basis of the operating conditions of the engine; in particular, the actuator 20 is controlled by an electronic control unit 21, shown in figure 1, which determines the movement of the actuator to bring the needle, in every operating condition of the engine, into the position which corresponds to the optimum flow cross-section out of the duct 15.
  • valve 13 there is associated with the valve 13 a position trans­ducer 22, which at every instant detects the position of the valve, which corresponds to the load applied to the engine.
  • the control unit 21 receives, from the position transducer 22, a signal relating to the position occupied from one instant to the next by the valve 13, and also other signals, corresponding to important operating parameters of the engine, advantageously constituted of the engine temperature, detected by a sensor 23, and the rotational speed of the engine itself, detected by a sensor 24.
  • the microprocessor 26 also controls the electronic ignition device 30, actuating the ignition member 5, and regulating its advance as a function of the operating conditions of the engine detected by the sensors.
  • the microprocessor 26 determines the position conditions of the needle 19, and therefore the air-fuel ratio, and the ignition advance on the basis of values stored in the memory 28, advantageously of the EPROM type, obtained in bench tests at various operating speeds of the engine, reproducing in every real condition those adjustments that, on the test bench, have led to reduced fuel consumption, reduced pollution emission at the exhaust and so on.
  • the variation in the air-fuel ratio requires an adjustment of the ignition advance values, in order that the thermal loadings on the compon­ents of the engine shall not be excessive; in particular, if the mixture is made leaner, that is to say the air-fuel ratio is increased, this requires a reduction in the ignition advance value, in order to avoid dangerous knocking or pinking.
  • a suitable value of the air-fuel ratio as a function of the engine load, in conjunction with an appropriate ignition advance value enables a net improvement in the specific fuel consumption and in the overall efficiency of the engine to be achieved, and also an improve­ment for the purposes of atmospheric pollution.
  • the carburettor comprises a body 31, in which there is present the principal duct 12, with a portion 14 of "venturi tube” type, traversed in the direc­tion of the arrow F by the air sucked in by the cylinder, and equipped with a valve 13 in the narrow zone of the venturi tube 14.
  • the position of the valve 13 is determined by the action of a cable 32, operated manually by the driver, in opposition to the action of a spring 33.
  • the fuel present in the chamber 16 is sucked through a calibrated nozzle 34 and arrives, through the duct 15, at the reduced section of the duct 12.
  • the conical needle 19 equipped with a conically tapered end portion 35, adapted for varying, by its greater or lesser insertion into the duct 15, the flow aperture of the duct.
  • the conical needle 19 is associated, at its upper end, with the actuator 20, which causes its axial displacement between a raised position, with the lower tapered end 35 entirely extracted from the duct 15, and a lowered position, in which the tapered end 35 entirely occludes the aperture of the duct 15.
  • the actuator 20 may be composed, as shown in the example in the figure, of a motor of the type known as "stepping”, having on its own shaft 36 a pinion 37, engaging into a rack 38 integral with the needle 19, or con­nected to the needle 19 by an analogous device for converting the rota­tional movement into a linear movement.
  • a motor of the type known as "stepping” having on its own shaft 36 a pinion 37, engaging into a rack 38 integral with the needle 19, or con­nected to the needle 19 by an analogous device for converting the rota­tional movement into a linear movement.
  • the stepping motor may be replaced by an actuator of a different class, for example a linear actuator, adapted for producing the axial movement required by the needle 19 with the desired stopping precision.
  • valve 13 With the valve 13 there is also associated a stem 39, connected to the rotatable arm 40 of the position transducer,22 supported, like the motor 20, on the body 31 of the carburettor.
  • the chamber 16 of the carburettor is equipped with a float valve 17, having the relevant float 41 comprising two elements, and the obturator 42 situated at the opening into the chamber 16 of the duct 18.
  • the microprocessor 26 can operate, not only on the basis of the data stored in the EPROM unit 28 as a result of bench tests, but also on the basis of a suitable algorithm, in the case where it is possible to determine, for a specific engine, a correlation between the operating quantities that can be detected and the regulating operations to be carried out on the carbur­ettor and the ignition.
EP88201325A 1987-07-02 1988-06-27 Gesteuerte Zündungs- und Zuspeisungsvorrichtung bei einer Brennkraftmaschine Withdrawn EP0297670A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2115587 1987-07-02
IT21155/87A IT1221935B (it) 1987-07-02 1987-07-02 Apparecchiatura di alimentazione ed accensione controllata per motori a combustione interna

Publications (2)

Publication Number Publication Date
EP0297670A2 true EP0297670A2 (de) 1989-01-04
EP0297670A3 EP0297670A3 (de) 1989-06-07

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EP88201325A Withdrawn EP0297670A3 (de) 1987-07-02 1988-06-27 Gesteuerte Zündungs- und Zuspeisungsvorrichtung bei einer Brennkraftmaschine

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EP (1) EP0297670A3 (de)
IT (1) IT1221935B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5284113A (en) * 1991-09-11 1994-02-08 Aktiebolaget Electrolux Arrangement in an i. c. engine
EP1835154A1 (de) * 2006-03-16 2007-09-19 Dell'orto S.P.A. Elektronische Steuerung, System für vergasergetriebene Verbrennungsmotoren mit Kontrolle des Zündzeitpunktes
WO2008053509A1 (en) * 2006-11-03 2008-05-08 Mas Di Emiliano Malerba Device for fuel input control in internal combustion carburettors
ES2582682A1 (es) * 2015-03-13 2016-09-14 Tecnigas Parts, S.L Dispositivo de motorización de carburador de ciclomotor de bajas prestaciones para el control de la velocidad y las emisiones
EP3415741B1 (de) * 2016-01-15 2022-03-23 Suzhou Cleva Precision Machinery & Technology Co., Ltd. Elektrische beschleunigervorrichtung und steuerungssystem dafür

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1119593B (de) * 1959-01-27 1961-12-14 Bosch Gmbh Robert Regeleinrichtung fuer mit Fremdzuendung und Kraftstoffeinspritzung arbeitende Brennkraftmaschinen
FR2296761A1 (fr) * 1974-12-31 1976-07-30 Zenith Carburetter Co Ltd Perfectionnements apportes aux moteurs a combustion interne a allumage par etincelles
FR2449792A1 (fr) * 1979-02-21 1980-09-19 Teledyne Ind Systeme de commande electronique d'un melange de carburant et d'air pour moteur a combustion interne
GB2162897A (en) * 1984-07-27 1986-02-12 Fuji Heavy Ind Ltd Fuel-air ratio and ignition timing control system for engines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1119593B (de) * 1959-01-27 1961-12-14 Bosch Gmbh Robert Regeleinrichtung fuer mit Fremdzuendung und Kraftstoffeinspritzung arbeitende Brennkraftmaschinen
FR2296761A1 (fr) * 1974-12-31 1976-07-30 Zenith Carburetter Co Ltd Perfectionnements apportes aux moteurs a combustion interne a allumage par etincelles
FR2449792A1 (fr) * 1979-02-21 1980-09-19 Teledyne Ind Systeme de commande electronique d'un melange de carburant et d'air pour moteur a combustion interne
GB2162897A (en) * 1984-07-27 1986-02-12 Fuji Heavy Ind Ltd Fuel-air ratio and ignition timing control system for engines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5284113A (en) * 1991-09-11 1994-02-08 Aktiebolaget Electrolux Arrangement in an i. c. engine
EP1835154A1 (de) * 2006-03-16 2007-09-19 Dell'orto S.P.A. Elektronische Steuerung, System für vergasergetriebene Verbrennungsmotoren mit Kontrolle des Zündzeitpunktes
CN101037971B (zh) * 2006-03-16 2011-07-06 德洛尔托有限公司 用于提供汽化器的受控点火内燃机的电控系统
WO2008053509A1 (en) * 2006-11-03 2008-05-08 Mas Di Emiliano Malerba Device for fuel input control in internal combustion carburettors
ES2582682A1 (es) * 2015-03-13 2016-09-14 Tecnigas Parts, S.L Dispositivo de motorización de carburador de ciclomotor de bajas prestaciones para el control de la velocidad y las emisiones
EP3415741B1 (de) * 2016-01-15 2022-03-23 Suzhou Cleva Precision Machinery & Technology Co., Ltd. Elektrische beschleunigervorrichtung und steuerungssystem dafür

Also Published As

Publication number Publication date
EP0297670A3 (de) 1989-06-07
IT1221935B (it) 1990-08-31
IT8721155A0 (it) 1987-07-02

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