US3596642A - Control system for limiting overload and overrunning of an internal-combustion engine - Google Patents

Control system for limiting overload and overrunning of an internal-combustion engine Download PDF

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Publication number
US3596642A
US3596642A US840186A US3596642DA US3596642A US 3596642 A US3596642 A US 3596642A US 840186 A US840186 A US 840186A US 3596642D A US3596642D A US 3596642DA US 3596642 A US3596642 A US 3596642A
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United States
Prior art keywords
opening
vacuum chamber
engine
vacuum
valve
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Expired - Lifetime
Application number
US840186A
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English (en)
Inventor
Shigefumi Nakata
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Mazda Motor Corp
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Toyo Kogyo Co Ltd
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Filing date
Publication date
Application filed by Toyo Kogyo Co Ltd filed Critical Toyo Kogyo Co Ltd
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Publication of US3596642A publication Critical patent/US3596642A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2710/00—Control of valve gear, speed or power
    • F01L2710/006—Safety devices therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2700/00—Mechanical control of speed or power of a single cylinder piston engine
    • F02D2700/02—Controlling by changing the air or fuel supply
    • F02D2700/0217—Controlling by changing the air or fuel supply for mixture compressing engines using liquid fuel
    • F02D2700/0225—Control of air or mixture supply
    • F02D2700/0228—Engines without compressor
    • F02D2700/0243—Engines without compressor by means of a plurality of throttle devices

Definitions

  • PATENTEDYAUE s an v I 35961642 SHEETIUFZ PATENTED Aus 3197i ENG PWR FIG. 4
  • This invention relates to a control system for limiting overload and overrunning of an internal-combustion engine, and more particularly to a system which operates by closing an intake sectional area control such as a secondary throttle valve or variable-area venturi of a carburetor at a predetermined limit above engine capacity.
  • This invention therefore, eliminates this and other drawbacks thus far inherent in the conventional intemal-combustion engine. It provides a control system for limiting overload and overrunning of an internal-combustion engine having a carburetor including intake sectional area control means adapted to open at load condition of the engine by vacuum in the air intake system of the engine. A throttle valve mechanically opens or closes by an accelerator pedal in conventional fashion. When the engine operates to exceed its limit, the engine vacuum is released by introducing atmosphere into the vacuum chamber to which the vacuum in the intake system of the engine is led, and the intake sectional area control means is automatically closed.
  • a secondary throttle valve acts as the intake sectional area control means in the secondary barrel which is operated by means of vacuum in the air intake system of the engine.
  • an engine has a carburetor with a variable-area venturi as the intake sectional area control means operated by the vacuum in the air intake system of the engine with the throttle valve operated mechanically through the accelerator pedal.
  • FIG. 1 is a sectional view of a control system embodying the present invention for limiting overload and overrunning of an internal-combustion engine.
  • FIG. 2 is similar to FIG. 1 but showing a second embodiment of the present invention.
  • FIG. 3 is a sectional view of a control system for limiting overload and overrunning of an internal-combustion engine having a carburetor of variable-area venturi type, as a third embodiment of the present invention.
  • FIGS. 4 and 5 are graphical representations of characteristics of the first and second embodiments of the present invention, shown in FIGS. 1 and 2, respectively.
  • FIG. 1 A first example of a control device for limiting overload and overrunning of an internal-combustion engine is shown in FIG. 1.
  • a carburetor 12 of the constant-area venturi type includes a primary throttle valve 13, operated by an accelerator pedal 11 though a mechanical linkage 14 in a first barrel 15 for a primary venturi 16.
  • a secondary throttle valve 17 lies in a secondary barrel 13 carrying a secondary venturi 19.
  • a vacuum inlet port 20 opens into the primary venturi l6 and another vacuum port 21 opens into the secondary venturi 19 and communicates with the vacuum inlet port 20.
  • Vacuum diaphragm means 22 includes a diaphragm 23, which divides it into two chambers including a vacuum chamber 24 communicating with the vacuum inlet ports 20 and 21 through passage 25.
  • An air chamber 26 communicates with the atmosphere.
  • the diaphragm 23 is mechanically linked to the secondary throttle valve 17 by linkage 27 for opening and closing the throttle valve 17 by the displacement of the diaphragm 23.
  • Solenoid valve means 28 includes a solenoid valve 29 having an opening 30 which communicates with the vacuum chamber 24 of the diaphragm means 22.
  • a valve body 29a selectively closes or opens opening 30.
  • a spring 31 is so disposed as to normally close the opening 30 by urging the valve body 29a closed, for controlling the communication of the vacuum chamber 24 of the diaphragm means 22 with the atmosphere through a port 32.
  • a solenoid coil 33 operates to open the opening 30 when energized, so as to connect the vacuum chamber 24 of the diaphragm means 22 with the atmosphere through port 32.
  • An engine speed detector 34 is coupled to an engine shaft (not shown).
  • a control switch 35 closes to energize the solenoid coil 33 when the engine speed detected by the detector 34 exceeds a predetermined limit.
  • An electric storage source 36 is connected by the switch 35 to the solenoid coil 33.
  • the switch 35 closes under control of the detector 34 to cause the energization of the solenoid coil 33 through electric storage source 36.
  • the valve body 29a opens opening 30.
  • the atmosphere is introduced through port 32 and opening 30 into the vacuum chamber 24 of diaphragm means 22.
  • the vacuum introduced from the venturis 16 and 19 through the ports 20 and 21 and passage 25 into the vacuum chamber 24 of the diaphragm means 22 is cancelled so that the diaphragm 23 closes the secondary throttle valve 17 disposed in the secondary barrel 18 of the carburetor 12.
  • the broken curve A designates a characteristic where only the primary throttle valve 13 opens while the secondary valve 17 is closed.
  • the curve B shows a characteristic where both the primary and secondary throttle valves 13 and 17 operate normally.
  • a carburetor 12 of the constant-area venturi type includes a primary throttle valve 13, acting in cooperation with the accelerator pedal 11 by mechanical linkage 14, in a primary barrel 15 for a primary venturi 16.
  • a secondary throttle valve 17 is carried in a secondary barrel 18 as is secondary venturi 19.
  • a vacuum inlet port 20 opens into the primary venturi l6 and another vacuum inlet port 21 opens into the secondary venturi l9 and communicates with the vacuum inlet port 20.
  • Vacuum diaphragm means 22 includes a diaphragm 23 dividing it into two chambers; a vacuum chamber 24 which communicates with the vacuum inlet ports 20 and 21 through a passage 25 andan air chamber 26 which communicates with the atmosphere.
  • the diaphragm 23 is mechanically linked to the secondary throttle valve 17 by linkage 27 for opening and closing the throttle valve 17 disposed in the second barrel 18 through displacement of diaphragm 23.
  • Solenoid valve means 28 includes a solenoid valve 29 having an opening 30 which communicates with the vacuum chamber 24 of the diaphragm means 22, a valve body 29a for closing or opening opening 30 and a spring 31 so disposed as to normally close the opening 30 by urging the valve body 29a thereagainst.
  • a solenoid coil 33 is adapted to open the opening 30, when energized, so as to connect the vacuum chamber 24 of the diaphragm means 22 with the atmosphere through port 32.
  • a control switch 37 closes electrical contacts 38 when vacuum at the secondary venturi 19, directed through a port 39 and passage 40, exceeds a predetermined value to energize solenoid coil 33.
  • the vacuum at the venturi 19 is generally proportional to the engine power so that if the engine power exceeds a predetermined limit P, the secondary throttle valve 17 is closed by the switch 37, solenoid valve means 28, and diaphragm means 22 to cause a decrease in engine power.
  • a carburetor 41 of the variable-area venturi type includes a throttle valve 13 acting in cooperation with an accelerator pedal (not shown) by mechanical linkage (not shown).
  • a carburetor body 42 carries a flow control assembly or an intake sectional area control means 43 having a suction piston 44 of known construction, a venturi 45 defined by the bottom wall of the suction piston 44 and bridge portion 42a.
  • a tapered needle 46 is secured-to the bottom wall of the suction piston 44 and is movably inserted into the fuel jet 47.
  • a spring 48 is so disposed as to close the variable venturi by urging the suction piston 44 downwards.
  • a port 49 is formed at the top of the flow control assembly 43.
  • Solenoid valve means 28 includes a solenoid valve 29 having an opening which communicates with port 49 of the flow control assembly 43, a valve body 29a which closes or opens the opening 30.
  • a spring 31 is so disposed as to normally close the opening 30 by urging the valve body 29a closed to control communication between port 49 of the flow control assembly 43 and the atmosphere through port 32.
  • a solenoid coil 33 opens opening 30 of the solenoid valve 29 to the atmosphere through the port 32, using any of the control means for energization of the solenoid coil 33 as shown in FIGS. 1 and 2.
  • solenoid valve means including a solenoid valve and a solenoid coil, a vacuum chamber carrying said diaphragm means, said solenoid valve having an opening which communicates with the vacuum chamber and having a valve body closing'and opening said opening, and means for energizing said solenoid coil to open said opening for communicating said vacuum chamber to the atmosphere when the speed or power exceeds a predetermined limit, means incorporating said solenoid coil within a circuit including a switch which closes and opens said circuit, said switch being operatively coupled to the air intake system of the engine.
  • solenoid valve means including a solenoid valve and a solenoid coil
  • a circuit including an electrical source, said solenoid coil and a switch which closes and opens said circuit, said solenoid valve having an opening communicating with said vacuum chambervof said diaphragm means, a port communicating with the atmosphere, a valve body closing and opening said opening and a spring urging said valve body to normally closed position, and means responsive to a predetermined engine-operating state for closing said switch to energize said solenoid coil and draw said valve body against said spring, whereby; said vacuum chamber of said diaphragm means is con- -nected to the atmosphere through said opening and said port to close said secondary throttle valve at said predetermined engine operation state.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
US840186A 1968-07-11 1969-07-09 Control system for limiting overload and overrunning of an internal-combustion engine Expired - Lifetime US3596642A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4892068 1968-07-11

Publications (1)

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US3596642A true US3596642A (en) 1971-08-03

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US840186A Expired - Lifetime US3596642A (en) 1968-07-11 1969-07-09 Control system for limiting overload and overrunning of an internal-combustion engine

Country Status (3)

Country Link
US (1) US3596642A (de)
DE (1) DE1934699A1 (de)
GB (1) GB1280886A (de)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3739760A (en) * 1972-03-29 1973-06-19 Ford Motor Co Enrichment fuel-air supply system
US3754540A (en) * 1971-09-30 1973-08-28 Gen Motors Corp Speed limiting means for an air valve carburetor
US3756209A (en) * 1971-02-20 1973-09-04 Aisin Seiki Vehicle speed-limiting apparatus
US3811418A (en) * 1971-05-03 1974-05-21 Aisin Seiki Vehicle speed limiting device
US3861490A (en) * 1972-03-30 1975-01-21 Aisin Seiki Constant speed control system of vehicle travel
US3957022A (en) * 1975-09-02 1976-05-18 Ford Motor Company Carburetor deceleration emission control
US3996904A (en) * 1975-03-20 1976-12-14 Toyota Jidosha Kogyo Kabushiki Kaisha Throttle positioner
US4060063A (en) * 1975-06-02 1977-11-29 Toyota Jidosha Kogyo Kabushiki Kaisha Throttle positioner
US4112886A (en) * 1976-12-01 1978-09-12 General Motors Corporation Engine speed governor
US4176633A (en) * 1978-02-14 1979-12-04 Colt Industries Operation Corp. Governor apparatus and system
US4178890A (en) * 1975-07-08 1979-12-18 Honda Giken Kogyo Kabushiki Kaisha Deceleration control apparatus for vehicle engine
US4274376A (en) * 1976-09-20 1981-06-23 Colt Industries Operating Corp. Governor apparatus and system
US4407385A (en) * 1980-11-04 1983-10-04 Return On Investment Corporation Cruise control modulator
US4454718A (en) * 1981-04-06 1984-06-19 Aisin Seiki Kabushiki Kaisha Safety control system for a turbocharged engine
US4487185A (en) * 1981-01-31 1984-12-11 Suzuki Jidosha Kogyo Kabushiki Kaisha Air-fuel mixture intake apparatus for internal combustion engines
US4561517A (en) * 1980-11-04 1985-12-31 Return On Investment Corporation Cruise control modulator
US4898137A (en) * 1986-03-31 1990-02-06 Yamaha Hatsudoki Kabushiki Kaisha Control device for vehicle
US5190007A (en) * 1991-01-31 1993-03-02 Jaguar Cars Limited Air induction system for an internal combustion engine
US20060130809A1 (en) * 2004-12-16 2006-06-22 Wetor Clyde R Engine speed control with high speed override mechanism
US20060130808A1 (en) * 2004-12-16 2006-06-22 Steffes Kevin D Engine speed control with high speed override mechanism
US20120111303A1 (en) * 2010-06-08 2012-05-10 Hitachi Koki Co., Ltd. Small Engine and Engine Work Machine Including the Same

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5343122U (de) * 1977-09-13 1978-04-13
DE2812498C2 (de) * 1978-03-22 1985-12-05 Audi AG, 8070 Ingolstadt Vorrichtung zur Begrenzung der Drehzahl einer Brennkraftmaschine
JPS5623554A (en) * 1979-08-01 1981-03-05 Toyota Motor Corp Throttle valve position controller
DE3013056C2 (de) * 1980-04-03 1983-01-13 Daimler-Benz Ag, 7000 Stuttgart Drehzahlregler zum Abregeln der Enddrehzahl einer gemischverdichtenden Brennkraftmaschine
JPS58101238A (ja) * 1981-12-11 1983-06-16 Mazda Motor Corp 過給機付エンジンの吸気装置
JPS58122321A (ja) * 1982-01-13 1983-07-21 Mazda Motor Corp 過給機付エンジンの吸気装置
DE19614464A1 (de) * 1996-04-12 1997-10-16 Dolmar Gmbh Handarbeitsgerät mit gesteuerter Gemischzuführung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2962015A (en) * 1957-03-08 1960-11-29 Serruys Max Yves Antonin Marie Fuel feed to engines through a carburetor
US3021827A (en) * 1957-10-23 1962-02-20 Gen Motors Corp Carburetor governor
US3249099A (en) * 1962-10-01 1966-05-03 Holley Carburetor Co Multi-stage carburetor
US3342463A (en) * 1965-02-20 1967-09-19 Honda Gijutsu Kenkyusho Kk Carburetor
US3444848A (en) * 1965-12-15 1969-05-20 Zenith Carburetter Co Ltd Fuel-air mixture intake systems for internal combustion engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2962015A (en) * 1957-03-08 1960-11-29 Serruys Max Yves Antonin Marie Fuel feed to engines through a carburetor
US3021827A (en) * 1957-10-23 1962-02-20 Gen Motors Corp Carburetor governor
US3249099A (en) * 1962-10-01 1966-05-03 Holley Carburetor Co Multi-stage carburetor
US3342463A (en) * 1965-02-20 1967-09-19 Honda Gijutsu Kenkyusho Kk Carburetor
US3444848A (en) * 1965-12-15 1969-05-20 Zenith Carburetter Co Ltd Fuel-air mixture intake systems for internal combustion engines

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756209A (en) * 1971-02-20 1973-09-04 Aisin Seiki Vehicle speed-limiting apparatus
US3811418A (en) * 1971-05-03 1974-05-21 Aisin Seiki Vehicle speed limiting device
US3754540A (en) * 1971-09-30 1973-08-28 Gen Motors Corp Speed limiting means for an air valve carburetor
US3739760A (en) * 1972-03-29 1973-06-19 Ford Motor Co Enrichment fuel-air supply system
US3861490A (en) * 1972-03-30 1975-01-21 Aisin Seiki Constant speed control system of vehicle travel
US3996904A (en) * 1975-03-20 1976-12-14 Toyota Jidosha Kogyo Kabushiki Kaisha Throttle positioner
US4060063A (en) * 1975-06-02 1977-11-29 Toyota Jidosha Kogyo Kabushiki Kaisha Throttle positioner
US4178890A (en) * 1975-07-08 1979-12-18 Honda Giken Kogyo Kabushiki Kaisha Deceleration control apparatus for vehicle engine
US3957022A (en) * 1975-09-02 1976-05-18 Ford Motor Company Carburetor deceleration emission control
US4274376A (en) * 1976-09-20 1981-06-23 Colt Industries Operating Corp. Governor apparatus and system
US4112886A (en) * 1976-12-01 1978-09-12 General Motors Corporation Engine speed governor
US4176633A (en) * 1978-02-14 1979-12-04 Colt Industries Operation Corp. Governor apparatus and system
US4407385A (en) * 1980-11-04 1983-10-04 Return On Investment Corporation Cruise control modulator
US4561517A (en) * 1980-11-04 1985-12-31 Return On Investment Corporation Cruise control modulator
US4487185A (en) * 1981-01-31 1984-12-11 Suzuki Jidosha Kogyo Kabushiki Kaisha Air-fuel mixture intake apparatus for internal combustion engines
US4454718A (en) * 1981-04-06 1984-06-19 Aisin Seiki Kabushiki Kaisha Safety control system for a turbocharged engine
US4898137A (en) * 1986-03-31 1990-02-06 Yamaha Hatsudoki Kabushiki Kaisha Control device for vehicle
US5190007A (en) * 1991-01-31 1993-03-02 Jaguar Cars Limited Air induction system for an internal combustion engine
US20060130809A1 (en) * 2004-12-16 2006-06-22 Wetor Clyde R Engine speed control with high speed override mechanism
US20060130808A1 (en) * 2004-12-16 2006-06-22 Steffes Kevin D Engine speed control with high speed override mechanism
US7152580B2 (en) * 2004-12-16 2006-12-26 Tecumseh Products Company Engine speed control with high speed override mechanism
US7165532B2 (en) * 2004-12-16 2007-01-23 Tecumseh Products Company Engine speed control with high speed override mechanism
US20120111303A1 (en) * 2010-06-08 2012-05-10 Hitachi Koki Co., Ltd. Small Engine and Engine Work Machine Including the Same
US8869774B2 (en) * 2010-06-08 2014-10-28 Hitachi Koki Co., Ltd. Small engine and engine work machine including the same

Also Published As

Publication number Publication date
GB1280886A (en) 1972-07-05
DE1934699A1 (de) 1970-01-15

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