EP0263495A2 - Dispositif d'admission de carburant pour carburateurs - Google Patents

Dispositif d'admission de carburant pour carburateurs Download PDF

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Publication number
EP0263495A2
EP0263495A2 EP87114594A EP87114594A EP0263495A2 EP 0263495 A2 EP0263495 A2 EP 0263495A2 EP 87114594 A EP87114594 A EP 87114594A EP 87114594 A EP87114594 A EP 87114594A EP 0263495 A2 EP0263495 A2 EP 0263495A2
Authority
EP
European Patent Office
Prior art keywords
fuel
passageway
negative pressure
flow rate
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.)
Withdrawn
Application number
EP87114594A
Other languages
German (de)
English (en)
Other versions
EP0263495A3 (fr
Inventor
Mitsuru Sekiya
Tetsuo Muraji
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.)
Mikuni Corp
Original Assignee
Mikuni Corp
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 Mikuni Corp filed Critical Mikuni Corp
Publication of EP0263495A2 publication Critical patent/EP0263495A2/fr
Publication of EP0263495A3 publication Critical patent/EP0263495A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • F02M7/133—Auxiliary jets, i.e. operating only under certain conditions, e.g. full power

Definitions

  • the present invention relates to a fuel supply device for supplying a mixture to an engine and, more particularly, to a fuel supply device for carburetors in which an air-fuel ratio of a mixture to be supplied to an engine is properly maintained by controlling a fuel flow rate so that a fuel liquid level in a vacuum passageway for a suction air flow rate detection communicating with a fuel passageway is constant strictlyly maintained.
  • Such a carburetor as shown in Fig.1, comprises a solenoid valve 7 arranged in the middle of a fuel passageway 6 having a main nozzle 3 opening into a fixed venturi 2 of a suction bore 1 at the one end and communicating with a float chamber 5 through a jet 4 at the other end; a fuel liquid level sensor 11 comprising, for example, a light emitting element 11a and a light receiving element 11b (Fig.2) which is arranged in the middle of a vacuum passageway 9 opening into a fixed venturi 8 generating a vacuum or negative pressure weaker than that of the fixed venturi 2 on the upstream side of the fixed venturi 2 at the one end and communicating with a portion between the jet 4 and the solenoid valve 7 in the fuel passageway 6 at the other end; and a control circuit (as shown in Fig.2) receiving a signal issued from the fuel liquid
  • reference numeral 13 denotes a level sensor output circuit connected to a light receiving element 11b; 14 denotes a reference value generat­ing circuit producing a reference value necessary for setting a reference level (that is, the predetermined level mention­ed above) of the fuel liquid level in the float chamber 5; 15 denotes a comparator; and 16 denotes a driving circuit for the solenoid valve 7.
  • the above fuel supply device is designed in such a way that the solenoid valve 7 is actuated by only the signal delivered from the level sensor as mentioned above and therefore, if it is desired to change temporarily the air-fuel ratio of the mixture by a signal based on other factor, for example, a detecting signal for the starting or warming-up of the engine or a signal issued from an O2 sensor, it is required to shift the position of the present level of the fuel liquid surface. Since such is impossible with the structure of the above device, the device has been unable to positively cope with a transient state of engine operation.
  • the object of the present invention in view of the above problems, is to provide a fuel supply device for carbu­retors of the type capable of positively coping with the transient state of the engine operation.
  • this object is accomplished by providing a branch passageway opening into a fuel passageway between a connection of a fuel passage­way with a vacuum passageway and a fuel jet at the one end and communicating with a fuel supply source at the other end, placing a valve device, in the middle of the branch passage­way, controlled by an electrical signal obtained by detecting an operating condition of the engine, and increasing the flow rate of fuel to be fed from the fuel supply source into the fuel passageway in accordance with the operating condition of the engine to thereby further increase the opening degree of the solenoid valve for fuel flow rate control.
  • the valve device is constructed as a solenoid valve whose opening degree is controlled by a signal indicative of the starting or warming-up operation of the engine or a signal from an O2 sensor or as a diaphragm type enriched valve whose opening degree is controlled in accordance with the extent of a vacuum generated on the downstream side of a throttle valve.
  • reference numeral 17 denotes a branch passageway communicating with a fuel passage­way between a portion where the fuel passageway 6 is connected with the vacuum passageway 9 and the jet 4 at the one end and communicating with the float chamber 5 at the other end; 18 a solenoid valve used as an auxiliary fuel flow rate control device arranged in the middle of the branch passage­way 17; 19 a throttle sensor for detecting the opening degree of the throttle valve 12; 20 an intake manifold connected to the suction bore 1 on the downstream side of the throttle valve 12; 21 an engine body; 22 a water temperature sensor for detecting the temperatures of cooling water for the engine; 23 a distributor ; 24 an exhaust manifold; 25 an O2 sensor attached to the exhaust manifold 24; 26 a revolution number detector; 27 a low-temperature increment calculator; 28 a calculator of amount to be enriched; 29 a PI-controller; 30 a driving range discriminator; and 31 an adder.
  • a signal indicative of the number of revolutions of the engine obtained from the distributor 23 and the revolution number detector 26 a signal indicative of the opening degree of the throttle valve 12 obtained from the throttle sensor 19, and a signal indicative of the cooling water temperature of the engine obtained from the water temperature sensor 22 are inputted to the driving range discriminator 30 to discriminate that the operation of the engine is in a starting and warming-up condition and then a driving pulse duty-controlling the solenoid valve 18 is outputted from the driving range dis­criminator 30 so that a standard amount of auxiliary fuel suitable for the operating condition described above flows into the fuel passageway 6 through the branch passageway 17.
  • the cooling water temperature of the engine is above the temperature of the change-over point shown in Fig. 6, that is, when the warming-up operation is completed, an output signal of the PI-controller 29 produced by the signal issued from the O2 sensor 25 is added to the above driving pulse through a terminal (c) and the switch S and as a result, the duty ratio of the solenoid valve 18 is properly adjusted.
  • the above change-over temperature (the chage-over point shown in Fig. 6) and the standard value are determined on the basis of experimental data and the above change-over operation of the switch S to the terminals (a), (b) and (c) can be performed automatically or manually.
  • the opening degree of the solenoid valve 7 is further increased to return the level of the fuel column to a predetermined level, based on the same operating principle as in the above-­mentioned conventional device, and consequently the amount of fuel discharged from the main nozzle 3 becomes large. Therefore, the air-fuel ratio of the mixture becomes smaller than a preset value (for example, a value suitable for normal operation), that is, a rich mixture is brought about, which is a condition appropriate to the starting and warming­up operation of the engine.
  • a preset value for example, a value suitable for normal operation
  • the duty ratio of the driving pulse of the solenoid valve 18 becomes small, as will be evident from the above description, and the fuel flow rate in the fuel passageway 6 decreases, so that the level of the fuel column is positioned below the predetermined level, the opening degree of the solenoid valve 7 is decreased, and the air-fuel ratio of the mixture is returned to the preset value, that is, the above standard value.
  • the fuel supply device can positively cope with the transient state of the engine operation.
  • Fig. 7 shows a principal part of another embodiment, which is provided with a diaphragm type enriched valve 32 in the middle of the branch passageway 17. That is to say, the valve 32 comprises a fuel chamber 32a provided in the middle of the branch passageway 17 and a vacuum chamber 32b communicating with, for example, the downstream side of the throttle valve 12, through a vacuum passageway 33 so that the valve 32 opens to bring about the rich mixture when the negative pressure of the manifold is low.
  • the fuel supply device according to the present invention is applicable to a low-speed fuel system in addition to a main fuel system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
EP87114594A 1986-10-06 1987-10-06 Dispositif d'admission de carburant pour carburateurs Withdrawn EP0263495A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1986153598U JPS63174556U (fr) 1986-10-06 1986-10-06
JP153598/86 1986-10-06

Publications (2)

Publication Number Publication Date
EP0263495A2 true EP0263495A2 (fr) 1988-04-13
EP0263495A3 EP0263495A3 (fr) 1989-06-28

Family

ID=15565988

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87114594A Withdrawn EP0263495A3 (fr) 1986-10-06 1987-10-06 Dispositif d'admission de carburant pour carburateurs

Country Status (3)

Country Link
EP (1) EP0263495A3 (fr)
JP (1) JPS63174556U (fr)
KR (1) KR880005352A (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3235237A (en) * 1965-02-15 1966-02-15 Holley Carburetor Co De-popper valve
US3587651A (en) * 1968-12-23 1971-06-28 Holley Carburetor Co Multistage power valve assembly
US4084562A (en) * 1972-08-08 1978-04-18 Robert Bosch Gmbh Fuel metering device
DE3028091A1 (de) * 1979-08-02 1981-03-26 Fuji Jukogyo K.K., Tokio/Tokyo Elektronisches regelsystem fuer einen vergaser
EP0207796A2 (fr) * 1985-07-05 1987-01-07 Mikuni Kogyo Kabushiki Kaisha Système réglé de carburant pour dispositifs d'alimentation de mélange d'air-carburant

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3235237A (en) * 1965-02-15 1966-02-15 Holley Carburetor Co De-popper valve
US3587651A (en) * 1968-12-23 1971-06-28 Holley Carburetor Co Multistage power valve assembly
US4084562A (en) * 1972-08-08 1978-04-18 Robert Bosch Gmbh Fuel metering device
DE3028091A1 (de) * 1979-08-02 1981-03-26 Fuji Jukogyo K.K., Tokio/Tokyo Elektronisches regelsystem fuer einen vergaser
EP0207796A2 (fr) * 1985-07-05 1987-01-07 Mikuni Kogyo Kabushiki Kaisha Système réglé de carburant pour dispositifs d'alimentation de mélange d'air-carburant

Also Published As

Publication number Publication date
JPS63174556U (fr) 1988-11-11
EP0263495A3 (fr) 1989-06-28
KR880005352A (ko) 1988-06-28

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