Auxiliary Control Of Carburetor Fuel Metering Patents (Class 123/437)
  • Patent number: 10012197
    Abstract: A throttle body fuel injection system including a throttle body with at least one air intake, a fuel injector coupled to the throttle body at a fuel port and an annular ring coupled to the cylindrical inner wall of the air intake. The annular ring includes a primary fuel discharge orifice adjacent to the fuel port and a plurality of secondary fuel discharge orifices arranged radially around the annular ring for spraying atomized fuel into the air intake.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: July 3, 2018
    Assignee: Holley Performance Products, Inc.
    Inventors: Doug Flynn, James Dralle, Amy Gieske, Charles Jenckes, Corey Spainhoward
  • Patent number: 9714638
    Abstract: The present invention provides an ignition timing control device and an ignition system which are capable of performing ignition timing control that easily suppresses occurrence of knocking for internal combustion engine. An ignition timing control device has a knocking detection device 41 detecting knocking of internal combustion engine; and an ignition timing adjustment device 43 adjusting ignition timing of internal combustion engine according to a knocking signal obtained from knocking detection device 41 and indicating knocking state and an externally-obtained signal concerning the ignition timing of the internal combustion engine. Knocking detection device 41 and ignition timing adjustment device 43 are electrically connected and formed integrally with each other.
    Type: Grant
    Filed: September 23, 2013
    Date of Patent: July 25, 2017
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Isao Suzuki, Katsunori Yazawa, Hiroshi Inagaki
  • Patent number: 9243578
    Abstract: Fuel efficiency of small carbureted engines can be improved through the use of a fuel shut off valve that ceases fuel flow in the carburetor upon determination that the engine throttle has been closed and the engine is not at or near an idle condition.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: January 26, 2016
    Assignee: Pinnacle Engines, Inc.
    Inventors: James M. Cleeves, Michael Hawkes
  • Patent number: 8915231
    Abstract: An engine includes a carburetor, a governor assembly, and a vacuum actuator. The carburetor includes a throttle plate configured to control a fluid flow, a throttle lever coupled to the throttle plate, and an intake port in fluid communication with an engine vacuum pressure. The governor assembly includes a governor, a governor linkage coupled to the governor and the throttle lever, and a governor spring coupled to the throttle lever to bias the throttle plate towards the fully open position. The vacuum actuator includes an actuator housing, a pressure-sensitive member positioned in the actuator housing, an actuator linkage directly coupled to the governor spring and also coupled to the pressure-sensitive member for movement in response to the engine vacuum pressure, and an actuator spring coupled between a fixed attachment point and the actuator linkage to bias the actuator linkage to increase the tension on the governor spring.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: December 23, 2014
    Assignee: Briggs & Stratton Corporation
    Inventor: Jason J. Raasch
  • Publication number: 20140331972
    Abstract: Provided are a tamper cap (30) which synchronously rotates a pilot screw (20) as being fitted to the pilot screw (20), engaging portions (26?1, 26?2, 33) which engage the pilot screw (20) and the tamper cap (30), a plurality of elastically deforming portions (25?1, 25?2) to which the tamper cap (30) is fitted, and a holding member (40) which is press-fitted to a groove (24) formed at a center part of the elastically deforming portions (25?1, 25?2) and which maintains the engaged state by preventing elastic deformation of the elastically deforming portions (25?1, 25?2). Owing to that the tamper cap (30) is made of metal, the pilot screw (20) and the tamper cap (30) are stiffly fixed with a mechanical structure without using glue, while increasing non-destructivity compared to a resin-made tamper cap.
    Type: Application
    Filed: December 6, 2012
    Publication date: November 13, 2014
    Inventors: Hiroo Yamada, Satoshi Murooka, Satoshi Fukaura, Naomi Seto
  • Patent number: 8833347
    Abstract: This invention relates to an automatically regulated gaseous mixer for small universal gas engine comprising a mixer body, a choker, an air inlet port, a main gas passage, a main metering jet, a mixture outlet port, a throttle valve, a gas connecting passage and an auxiliary gas passage, which is characterized in that an auxiliary gas passage is set parallel to the main gas passage and connected through a vertical gas passage. Its top end is linked to the main gas passage and the lower end is connected with the auxiliary gas passage, one end of the auxiliary passage is connected with the mixture outlet port. The shaft of throttle valve is in line with auxiliary gas passage and is extended into the auxiliary gas passage to form an automatically regulated valve. The advantages of this invention are simple and compact; practical and reliable.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: September 16, 2014
    Inventors: Huachang Yang, Hao Wu
  • Publication number: 20140216402
    Abstract: A carburetor for a hand-guided power tool has a carburetor housing and a carburetor rotor supported rotatably in the carburetor housing about an axis of rotation. A needle is disposed on the carburetor rotor and projects into a fuel opening of the carburetor. An adjusting element is operatively connected to the needle so as adjust a position of the needle relative to the carburetor rotor. The adjusting element has an engagement contour that is to be engaged by a tool for adjusting the adjusting element. A securing contour that is fixedly connected to the carburetor rotor is provided. The securing contour, at any point of the securing contour, has a spacing to the axis of rotation of at least approximately 10 mm.
    Type: Application
    Filed: December 17, 2013
    Publication date: August 7, 2014
    Applicant: Andreas Stihl AG & Co. KG
    Inventors: Kai Oppenländer, Antonio Fattorusso, Jörg Amann, Arne Götzel
  • Publication number: 20140196688
    Abstract: A one-step starting carburetor includes a body, and a pulse generator and an oil pumping unit which are connected with the body. The oil pumping unit can produce an oil pumping function to pump fuel from an oiler to the carburetor when a flywheel of an engine is revolving. When the carburetor is operating, it only needs to pull a starting line and does not need to extrude an oil pumping ball to pump the fuel for the carburetor or to close a choke valve. After hearing a voice like ‘poop-poop’, it does not need to half open the choke valve to warm the engine or to open the choke valve after warming the engine. Thus the operation of the carburetor is simple for users' convenience.
    Type: Application
    Filed: April 15, 2013
    Publication date: July 17, 2014
    Inventor: Qian Chen
  • Patent number: 8726882
    Abstract: An engine includes a throttle assembly, a governor, and an actuator. The throttle assembly is designed to at least partially control a fuel flow rate of the engine. The governor is designed to sense a speed of the engine and at least partially control the throttle assembly as a function of the engine speed. The actuator is designed to sense a manifold vacuum pressure of the engine and at least partially control the throttle assembly as a function of the vacuum pressure.
    Type: Grant
    Filed: March 16, 2010
    Date of Patent: May 20, 2014
    Assignee: Briggs & Stratton Corporation
    Inventor: Jason J. Raasch
  • Publication number: 20140026854
    Abstract: A fuel supply system for small two-stroke internal combustion engines for e.g. chain saws, line trimmers and similar hand-held power-tools including a diaphragm carburetor (20) equipped with a purging system (80a, 81a) or priming system (80b, 81b) for facilitating starting of the engine (1). Downstream of the diaphragm (30), the carburetor has a fuel valve (60) with a fuel cavity (73), which when the valve is not closed being connected via a fuel conduit (37) to a fuel nozzle (35, 36) in a main air passage (21) in the carburetor. The purging system or priming system including a fuel line (80a; 80b), which is provided with a manually operated pump (81a; 81b) and is connected between a fuel tank (26) and either the fuel cavity (73) or the fuel conduit (37).
    Type: Application
    Filed: April 15, 2011
    Publication date: January 30, 2014
    Applicant: HUSQVARNA AB
    Inventors: Fredrik Lindström, Pär Martinsson, Magnus Ottosson, Rikard Rydberg
  • Patent number: 8527185
    Abstract: A vehicle includes an engine and an exhaust system which ignites fuel from fuel injectors to purify exhaust gas. An air compressor delivers compressed intake air to the engine, and a turbine energizes the compressor. A controller calculates an engine thermal efficiency value using temperature and mass flow rate values from various sensors. The controller maintains a temperature of the exhaust gas downstream of the turbine using the thermal efficiency value. A control system includes the sensors and a host machine operable for maintaining the temperature of the exhaust gas above the threshold using the thermal efficiency value. A method for maintaining the temperature of the exhaust gas includes measuring the inlet and outlet temperatures of an air intake system, measuring the mass flow rate of compressed intake air, and using the host machine to maintain the temperature of the gas using the thermal efficiency value.
    Type: Grant
    Filed: November 3, 2010
    Date of Patent: September 3, 2013
    Assignee: GM Global Technology Operations LLC
    Inventor: Patrick Barasa
  • Publication number: 20120318236
    Abstract: A work apparatus has an engine with a carburetor. An actuating element is connected to the choke shaft of the choke element of the carburetor. An operating mode selector has operating, warm start and cold start positions and is connected fixedly in terms of rotation to an adjusting element. The actuating element is pivoted through a pivot angle (?1) from the operating position into the warm start position and through a pivot angle (?2) from the warm start position into the cold start position. The selector is pivoted through a pivot angle (?1) from the operating position into the warm start position and through a pivot angle (?2) from the warm start position into the cold start position. The ratio of the pivot angle (?2) to the pivot angle (?1) is at least approximately 1.5 times the ratio of the pivot angle (?2) to the pivot angle (?1).
    Type: Application
    Filed: December 19, 2011
    Publication date: December 20, 2012
    Inventors: Evelyn Kullik, Philipp Neumann
  • Patent number: 8335629
    Abstract: A method for controlling a valve of a crank case scavenged internal combustion engine includes determining a valve control sequence, wherein the valve is controlled in consecutive periods of revolutions each having a period length of at least ten revolutions, and controlling the valve according to the valve control sequence to adjust the ratio of fuel to air in a combustible mixture delivered to an engine combustion chamber. Determining the valve control sequence for each period includes providing a number of valve shut-off positions, wherein the number of valve shut-off positions corresponds to an amount of fuel or air to be supplied to the engine during the corresponding period, and determining which revolutions of the period that the valve is to be closed.
    Type: Grant
    Filed: May 14, 2007
    Date of Patent: December 18, 2012
    Assignee: Husqvarna AB
    Inventors: Bo Carlsson, Mikael Larsson
  • Patent number: 8204672
    Abstract: Methods and apparatus are provided for detecting an anomaly in fuel demand data and fuel supply data generated by a fuel metering system for an engine, The method comprises collecting the fuel demand data and the fuel supply data during operation of the fuel metering system, generating expected fuel supply data based on the collected fuel demand data and a nominal response model describing the expected behavior of the fuel metering system, and detecting the anomaly if a difference between the expected fuel supply data and the collected fuel supply data exceeds a predetermined threshold.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: June 19, 2012
    Assignee: Honeywell International, Inc.
    Inventors: Dinkar Mylaraswamy, Girija Parthasarathy
  • Patent number: 8028679
    Abstract: A control system for an engine having a first cylinder and a second cylinder is disclosed having a first engine valve movable to regulate a fluid flow of the first cylinder and a first actuator associated with the first engine valve. The control system also has a second engine valve movable to regulate a fluid flow of the second cylinder and a sensor configured to generate a signal indicative of a pressure within the first cylinder. The control system also has a controller that is in communication with the first actuator and the sensor. The controller is configured to compare the pressure within the first cylinder with a desired pressure and selectively regulate the first actuator to adjust a timing of the first engine valve independently of the timing of the second engine valve based on the comparison.
    Type: Grant
    Filed: November 26, 2008
    Date of Patent: October 4, 2011
    Assignee: Caterpillar Inc.
    Inventors: Martin L. Willi, Scott B. Fiveland, David T. Montgomery, Weidong Gong
  • Publication number: 20110226218
    Abstract: A secondary fuel premixing controller for introducing a secondary fuel into an air intake manifold of a primary fuel combustion engine. The controller includes a hollow housing having an air inlet, a main controller body, and an air/secondary fuel mixing outlet connected together in central alignment one to another. The air inlet introduces incoming air into the controller while the air/fuel mixing outlet discharges a blended mixture of secondary fuel and air into an air intake manifold of the running engine. The main controller body includes a secondary fuel manifold positioned centrally within an interior of the controller which supports for axial movement an air pressure valve positioned proximate to the air inlet and a secondary fuel/air blender connected thereto. The secondary fuel manifold also has a secondary fuel inlet formed therethrough connectable at an outer end thereof to a source of secondary fuel, an inner end positioned for sealing engagement with the secondary fuel/air blender.
    Type: Application
    Filed: March 16, 2011
    Publication date: September 22, 2011
    Inventors: Supoj Vongsateanchai, Cholathorn Rakdee, Wisoth Vinaisompan, Nitnipa Seanglum
  • Publication number: 20110056463
    Abstract: A carburetor control system includes: a governor device that is coupled to a throttle lever, opens a throttle valve when an operation of an engine is stopped, and opens or closes the throttle valve in accordance with a rotational number of the engine when the engine is in operation; a choke return spring urging a choke lever in a direction to close a choke valve; and an automatic choke device opening the choke valve in accordance with an increase in temperature of the engine. In the carburetor control system, the throttle lever is provided with a drive arm pivoting the choke lever, during a cold operation of the engine, to a position where the choke valve is at an intermediate degree of opening in operative connection with the throttle lever being pivoted by the governor device to a position where the throttle valve is at a degree of opening for idling or a position in a vicinity thereof.
    Type: Application
    Filed: September 9, 2009
    Publication date: March 10, 2011
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Tetsuya Arai, Takanori Sato
  • Patent number: 7886716
    Abstract: A carburetor control system includes: a governor device that is coupled to a throttle lever, opens a throttle valve when an operation of an engine is stopped, and opens or closes the throttle valve in accordance with a rotational number of the engine when the engine is in operation; a choke return spring urging a choke lever in a direction to close a choke valve; and an automatic choke device opening the choke valve in accordance with an increase in temperature of the engine. In the carburetor control system, the throttle lever is provided with a drive arm pivoting the choke lever, during a cold operation of the engine, to a position where the choke valve is at an intermediate degree of opening in operative connection with the throttle lever being pivoted by the governor device to a position where the throttle valve is at a degree of opening for idling or a position in a vicinity thereof.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: February 15, 2011
    Assignee: Honda Motor Co., Ltd.
    Inventors: Tetsuya Arai, Takanori Sato
  • Patent number: 7882822
    Abstract: Method for driving an electromagnetic actuator in a diaphragm carburettor for control of air/fuel ratio foresees at least the following steps: associating an electromagnetic actuator in a diaphragm carburettor for control of air/fuel ratio with the current generation device in an internal combustion engine; driving the aforementioned electromagnetic actuator with pulses suitable for generating the force necessary to actuate the actuator; generating said drive pulses of the actuator in the moments when the current pulses of the aforementioned current generator are such that the maximum current is available during the cycle of the motor.
    Type: Grant
    Filed: October 17, 2007
    Date of Patent: February 8, 2011
    Assignee: Selettra S.R.L.
    Inventors: William T. Cobb, Jr., Massimo Casoni
  • Publication number: 20100089365
    Abstract: A variable rate throttle for controlling a vehicle carburetor having control cables. The variable rate throttle includes a housing surrounding a cavity, a plurality of interchangeable throttle reels, each throttle reel having a different track radius, where a particular one of the throttle reels is positioned at a time in the cavity of the housing and which engages the control cables. A throttle handle engages the interchangeable throttle reel so that rotation of the handle causes rotation of the throttle reel and thus moves the control cables of the vehicle carburetor.
    Type: Application
    Filed: September 30, 2009
    Publication date: April 15, 2010
    Inventors: Steven Richard Scott, Chris Van Andel
  • Patent number: 7584745
    Abstract: A injection conversion body with internal injector compartment for converting a normally carbureted internal combustion engine to a fuel injected engine while concealing the fuel delivery system. The original engine carburetor is removed. The plenum assembly is mated to the original engine intake manifold and a suitable throttle body is mated to the intake apertures which are oriented to permit installation without modification to the vehicle body work or relocation of other engine components. Air drawn through the throttle body is mixed with fuel from fuel injectors inside the plenum as it is directed to and exits the fuel air exhaust opening and enters the engine intake manifold. Interchangeable restriction plates are provided for insertion into the plenum fuel air exhaust opening to tune the fuel/air mixing characteristics to match the needs of the engine with which it is mated. Fuel is delivered to the fuel injectors through an internal, concealed fuel rail and fuel lines.
    Type: Grant
    Filed: October 27, 2008
    Date of Patent: September 8, 2009
    Inventor: Thomas Ross, Jr.
  • Publication number: 20090211555
    Abstract: In order to allow fuel to be delivered in a controlled manner into a mixing chamber of a carburetor, a needle is displaced towards a needle seat between an open and a closed position in a clocked manner relative to an intake stroke of the engine such that the amount of fuel that flows into the mixing chamber via a fuel duct is controlled in accordance with the rotational speed and the engine load.
    Type: Application
    Filed: December 8, 2006
    Publication date: August 27, 2009
    Applicants: BING POWER SYSTEMS GMBH, R.E. PHELON COMPANY, INC.
    Inventors: Martin Fischer, Lars Ottosson
  • Patent number: 7568472
    Abstract: Methods and fuel systems to reduce evaporative emissions of a volatile fuel. A fuel tank contains fuel, a carburetor mixes air with the fuel from the fuel tank, and a plurality of fluid paths route fuel amongst and/or between the fuel tank and the carburetor. A valve actuation device stops flow of fuel in one or more of the plurality of fluid paths and the carburetor is adapted to be drained of fuel during engine shutdown to reduce or prevent evaporative emissions from the fuel system. The carburetor is preferably designed so as to minimize a volume of fuel contained therein.
    Type: Grant
    Filed: July 15, 2008
    Date of Patent: August 4, 2009
    Assignee: Walbro Engine Management, L.L.C.
    Inventor: John C. Woody
  • Publication number: 20090145399
    Abstract: A method for controlling a valve of a crank case scavenged internal combustion engine includes determining a valve control sequence, wherein the valve is controlled in consecutive periods of revolutions each having a period length of at least ten revolutions, and controlling the valve according to the valve control sequence to adjust the ratio of fuel to air in a combustible mixture delivered to an engine combustion chamber. Determining the valve control sequence for each period includes providing a number of valve shut-off positions, wherein the number of valve shut-off positions corresponds to an amount of fuel or air to be supplied to the engine during the corresponding period, and determining which revolutions of the period that the valve is to be closed.
    Type: Application
    Filed: May 14, 2007
    Publication date: June 11, 2009
    Applicant: Husqvarna AB
    Inventors: Bo Carlsson, Mikael Larsson
  • Publication number: 20090107459
    Abstract: A injection conversion body with internal injector compartment for converting a normally carbureted internal combustion engine to a fuel injected engine while concealing the fuel delivery system. The original engine carburetor is removed. The plenum assembly is mated to the original engine intake manifold and a suitable throttle body is mated to the intake apertures which are oriented to permit installation without modification to the vehicle body work or relocation of other engine components. Air drawn through the throttle body is mixed with fuel from fuel injectors inside the plenum as it is directed to and exits the fuel air exhaust opening and enters the engine intake manifold. Interchangeable restriction plates are provided for insertion into the plenum fuel air exhaust opening to tune the fuel/air mixing characteristics to match the needs of the engine with which it is mated. Fuel is delivered to the fuel injectors through an internal, concealed fuel rail and fuel lines.
    Type: Application
    Filed: October 27, 2008
    Publication date: April 30, 2009
    Inventor: Thomas Ross, JR.
  • Patent number: 7489998
    Abstract: According to the invention, prior to or during an intermediate compression around the upper dead center of a piston of an internal combustion engine during a change in charge a predetermined first fuel mixture is metered into the combustion chamber of the respective cylinder. During the intermediate compression, measured values of pressure in the combustion chamber are measured in a predetermined first crankshaft angle window using cylinder pressure sensor. A measurement for a conversion rate of the first fuel mixture is determined based on the detected measured values of the pressure and reference values of the pressure, which characterize the corresponding pressure curve in the combustion chamber when no fuel is metered. A control signal for at least one actuator of the internal combustion engine is determined based on the conversion rate.
    Type: Grant
    Filed: January 30, 2006
    Date of Patent: February 10, 2009
    Assignee: Siemens Aktiengesellschaft
    Inventors: Erwin Bauer, Dietmar Ellmer, Thorsten Lauer
  • Publication number: 20080135018
    Abstract: A fuel enrichment device includes a body forming a first fuel chamber and a second fuel chamber. The second fuel chamber is adapted to contain a predetermined amount of enriching fuel to be provided to an engine. A normally open valve connects the first fuel chamber to the second fuel chamber. A normally closed valve for controls the provision of enriching fuel to the engine. The normally closed valve is open whenever the normally open valve is closed.
    Type: Application
    Filed: December 6, 2006
    Publication date: June 12, 2008
    Applicant: HUSQVARNA OUTDOOR PRODUCTS INC.
    Inventors: William B. Keeton, Rodney W. Tynes
  • Patent number: 7353804
    Abstract: A method and associated arrangement for achieving an adjusted engine setting utilizing engine output and/or fuel consumption. An engine that consumes fuel is run. Fuel consumption and/or engine operation output is determined. A value is determined utilizing the determined fuel consumption and/or the determined engine operation output. The engine setting is adjusted to cause the determined value to change toward a desired value.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: April 8, 2008
    Assignee: Husqvarna Outdoor Products Inc.
    Inventors: Edward Bucktron, Derek J. Egerstaffer, Jason D. Duke
  • Patent number: 7251557
    Abstract: An internal combustion engine that can be operated in compression ignition mode, comprising a fuel injector (2) for each cylinder; a fuel injection control unit (4) for controlling fuel injection quantity and a piston (5) in each cylinder whose compression action causes a mixture of air and fuel to be ignited. The engine is further provided with inlet and outlet valves (6, 7) and sensors (12–16) for measuring various engine operating parameters, is disclosed. During compression ignition mode, the control unit controls the fuel injector to perform a first fuel injection before, and a second fuel injection after top dead center of the piston stroke during or after a negative valve overlap period. A method for operating the engine and a computer readable storage device (4) having stored therein data representing instructions executable by a computer to implement a compression ignition for an internal combustion engine is also described.
    Type: Grant
    Filed: July 11, 2006
    Date of Patent: July 31, 2007
    Assignee: Ford Global Technologies, LLC
    Inventors: Hans Strom, Lucien Koopmans
  • Patent number: 7216856
    Abstract: The accelerator apparatus prevents air from remaining within a pump chamber and discharged fuel vapor from causing a pumping effect so as to a destabilize engine operation and increase of an exhaust gas content of harmful material, in an accelerator apparatus in which an accelerated fuel passage draws and discharges fuel to the pump chamber of an accelerator pump, which is connected to a main fuel passage. The pump chamber of the accelerator pump is mechanically coupled with a throttle valve and is connected to a fixed fuel chamber storing a fuel delivered to an intake passage at a fixed pressure by the accelerated fuel passage. Air remaining within the pump chamber and a fuel vapor generated within the pump chamber are discharged to the fixed fuel chamber, and fuel extruded from the pump chamber due to a pumping effect of the remaining air and the fuel vapor enters into the fixed fuel chamber, thereby preventing the alteration of a rate of the fuel flowing through a main fuel passage.
    Type: Grant
    Filed: September 20, 2005
    Date of Patent: May 15, 2007
    Assignee: ZAMA Japan Co., Ltd.
    Inventors: Yoshiharu Iwasa, Mamoru Toda
  • Patent number: 7210672
    Abstract: An accelerated fuel passage of an accelerator pump operatively connected with a throttle shaft having a throttle valve. The accelerated fuel passage is connected to an upstream side of a needle orifice, which orifice is coupled to a main nozzle. Consequently, the fuel is discharged by the accelerator pump into an area before the needle orifice. By the addition of a one-way check valve system in a fuel pick up at a metering chamber for a fuel circuit, the fuel driven by the accelerator pump piston is discharged to a venturi tube of an intake passage through the main nozzle. A self pumping effect caused by an engine pulsation is dampened or eliminated by the needle orifice. Further, a check valve is provided within a fuel pick up at a metering chamber for a fuel circuit, whereby the fuel driven by the accelerator pump piston is discharged to a venturi tube through a main nozzle without returning to the fixed fuel chamber.
    Type: Grant
    Filed: September 6, 2005
    Date of Patent: May 1, 2007
    Assignee: ZAMA Japan Co., Ltd.
    Inventor: Takashi Ishii
  • Patent number: 7144000
    Abstract: An internal combustion engine including a carburetor. The internal combustion engine includes a choke valve disposed within the carburetor, and a choke lever interconnected with the choke valve for movement with the choke valve. The engine also includes a throttle valve disposed within the carburetor and a throttle lever interconnected with the throttle valve for movement therewith. An intermediate lever is disposed between the throttle lever and the choke lever for movement with the choke and throttle levers. In one embodiment, the engine includes a connecting link coupled between the choke and intermediate levers, the connecting link movable with movement of the choke lever such that movement of the choke lever is translated into movement of the intermediate lever.
    Type: Grant
    Filed: May 31, 2005
    Date of Patent: December 5, 2006
    Assignee: Briggs & Stratton Corporation
    Inventors: David Roth, James J. Dehn, Thomas G. Guntly
  • Patent number: 7021289
    Abstract: A system and method to control engine valve timing to improve the start of an internal combustion engine. Electromechanical valves are controlled in a manner to reduce hydrocarbon emissions during the start of an internal combustion engine.
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: April 4, 2006
    Assignee: Ford Global Technology, LLC
    Inventors: Donald J. Lewis, John D. Russell, Vince Winstead
  • Patent number: 7011075
    Abstract: A method for discontinuing combustion in a cylinder of an internal combustion engine having an intake manifold and an emission control device coupled downstream of thereof, where the cylinder has at least one valve, the method comprising during a shut-down, holding the at least one valve closed for at least a cycle of the cylinder to reduce a flow of gasses from the engine to the emission control device.
    Type: Grant
    Filed: March 14, 2005
    Date of Patent: March 14, 2006
    Assignee: Ford Global Technologies, LLC
    Inventor: Donald J. Lewis
  • Patent number: 6990969
    Abstract: An automatic choke apparatus for use in an internal combustion engine. The choke apparatus includes a choke valve automatically operable in response to the speed of the engine, a thermally conductive assembly that conducts heat from exhaust gases produced by the engine, a thermally responsive member in thermal communication with the thermally conductive assembly, and a mechanism that moves in response to the thermally responsive member to cause the choke valve to remain in at least a partially open position during engine starting when the thermally responsive member senses a temperature above a predetermined temperature. The thermally conductive assembly at least partially surrounds the path of the exhaust gases.
    Type: Grant
    Filed: February 23, 2004
    Date of Patent: January 31, 2006
    Assignee: Briggs and Stratton Corporation
    Inventors: David Roth, James J. Dehn, Thomas G. Guntly, Curtis Schultz, Hisaya Iwata, Steven R. Schlosser, Travis Nickels, Gregory D. Irwin, Kenneth R. Breitenstein, Steven A. Dethloff
  • Publication number: 20040244775
    Abstract: The invention relates to a fuel dosage device comprising a fuel chamber (5), a fuel inlet (6) which can be opened and closed and leads to the fuel chamber (5), and at least one fuel outlet (14) leading from the fuel chamber to a suction channel (16) of an internal combustion engine. Part of a wall of the fuel chamber (5) consists of a first element (12) which can be moved according to a pressure difference between a pressure in the fuel chamber (5) and an ambient air pressure, said element being coupled to a closing element (7, 8) for opening and closing the fuel inlet (6). Said fuel dosage device enables a quantity of fuel, which is supplied to the suction channel (16) for a pre-defined operating position of the internal combustion engine, to be automatically regulated according to the ambient air pressure.
    Type: Application
    Filed: March 9, 2004
    Publication date: December 9, 2004
    Inventor: Michael Steffen
  • Patent number: 6786208
    Abstract: The boost fuel enricher is used with internal combustion engines, either carbureted or fuel-injected, that are equipped with compressors, i.e., turbocharged or supercharged, in order to enrich the air/fuel ratio when the engine is under boost. The boost fuel enricher is a diaphragm pressure valve with an adjustable throat. The diaphragm is subject to atmospheric pressure on one side, and senses inlet air pressure in the air intake passage on the other side. When inlet air pressure exceeds atmospheric pressure, the valve opens to admit additional air-fuel mixture into the air intake passage through a venturi in the air intake passage. The throat is made adjustable by sliding block valves in the fuel passage.
    Type: Grant
    Filed: June 10, 2003
    Date of Patent: September 7, 2004
    Inventor: Hector H. Velez-Velez
  • Publication number: 20030029418
    Abstract: A choke and throttle control arrangement for a small engine includes a base plate to which a pair of levers are pivotally joined. One includes a governor spring arm connected to the engine's speed governor, and the other is provided with an arm which serves as a choke actuator. A spring interconnects the two levers to permit them to rotate in unison at low engine speed in response to operator actuation of a throttle control handle. An adjustable stop member is positioned to interrupt the rotation of the governor spring arm when a selected less-than-maximum engine speed is reached. Further throttle control handle advancement permits the choke actuating arm to move to the closed choke position. As the throttle control handle is moved towards a low speed setting, the lever containing the choke actuating arm returns to the position at which the selected less-than-maximum speed was reached.
    Type: Application
    Filed: July 13, 2002
    Publication date: February 13, 2003
    Inventors: Joseph P. Deschamps, Doyle S. Maxwell
  • Patent number: 6516779
    Abstract: A throttle adjusting apparatus for use with a machinery for soil management includes a throttle cable. The throttle cable has one end portion to which a throttle valve, a choke valve, and a fuel cock are connected. The apparatus further includes a throttle lever. The throttle lever is disposed to pivot in a plane perpendicular to a longitudinal direction of a central axis of a grip mounted to a handle of the machinery. The throttle lever is connected to another end portion of the throttle cable. The throttle valve, the choke valve, and the fuel cock are operated simultaneously by means of the throttle lever.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: February 11, 2003
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventor: Takashi Ikeda
  • Patent number: 6267102
    Abstract: A single needle diaphragm type carburetor has a throttle valve in a mixing passage with a venturi, an idle fuel nozzle downstream of the throttle valve when in its idle position, a high speed fuel nozzle preferably disposed within the venturi upstream of the throttle valve and a supplemental air bleed passage opening into the mixing passage upstream of both the idle and high speed fuel nozzles. Both the idle and high speed fuel nozzles communicate with each other through a transfer passage and are fed from the same fuel circuit controlled by a single needle valve which limits the fuel flow to them. At idle or low speed and low load engine operation air supplied by the supplemental air bleed passage is mixed with fuel supplied to the idle fuel nozzle. At wide open throttle, air from the air bleed passage is routed near the idle fuel nozzle, and mixed with the fuel supplied to the high speed nozzle.
    Type: Grant
    Filed: February 23, 2000
    Date of Patent: July 31, 2001
    Assignee: Walbro Corporation
    Inventors: George M Parrullo, Michael P. Burns
  • Patent number: 6186117
    Abstract: The air/fuel mixture ratio supplied to an internal combustion engine of a vehicle is modified to achieve a constant mass flow rate in spite of changes in atmospheric temperature and pressure conditions by employing an electronic compensation system. The system has sensors which detect air temperature and barometric pressure, from which signals are developed controlling the float bowl pressure in the engine carburettors, thus modifying the air/fuel mixture ratio as desired. The system also includes provision for enriching the fuel content of the mixture supplied to the engine to provide an oversupply of fuel in cold start situations.
    Type: Grant
    Filed: October 9, 1997
    Date of Patent: February 13, 2001
    Assignee: Bombardier Inc.
    Inventor: Sylvain Matte
  • Patent number: 5740781
    Abstract: A starting system for an internal combustion engine is provided for enhancing engine startability and performance by simultaneously controlling the volume of air flowing through a carburetor and the ratio of an air/fuel mixture through a single manual operation. The starting system is constructed to utilize atmospheric air control feed back to a carburetor and includes a piston disposed with a chamber which accesses two atmospheric ports. When the piston is positioned to fully close a first of the ports, a second of the ports is fully open. Similarly, when the piston fully opens the second port, the first port is fully closed. The two atmospheric ports access the carburetor idle system and intake manifold of the engine respectively. For starting of the engine in cold temperatures, the starting system also includes a fuel prime arrangement for enriching the ratio of air/fuel delivered to the engine.
    Type: Grant
    Filed: May 9, 1996
    Date of Patent: April 21, 1998
    Assignee: Tillotson, Ltd.
    Inventors: William A. Scott, Gary L. Baumbarger, John G. Easter
  • Patent number: 5724945
    Abstract: An apparatus for controlling air/fuel ratio in a carburetted single cylinder internal combustion engine, including an apparatus for preventing fuel from being drawn into a carburetor, and, in turn, toward the cylinder inlet, as a result of air flow oscillations occurring during the portion of an engine cycle in which the at least one inlet valve is closed.
    Type: Grant
    Filed: September 18, 1996
    Date of Patent: March 10, 1998
    Assignee: Gas Research Institute
    Inventor: James C. Swain
  • Patent number: 5462024
    Abstract: An auxiliary carburetion device in direct fuel injection engines, to be positioned in correspondence with a main duct (12) feeding air to the engine crankcase (10), a throttling member (38) being located in the main duct (12). The device includes a block (13) containing at least one selective regulating element (15, 25) positioned in a connection duct (19, 20; 30) which is connected at one end to a vessel (14; 45, 51) containing a constant predeterminable amount of fuel and to a mixing air duct (23, 32), and at the other end to the main duct (12) feeding the crankcase (10).
    Type: Grant
    Filed: December 20, 1993
    Date of Patent: October 31, 1995
    Assignee: Piaggio Veicoli Europei S.p.A.
    Inventor: Marco Nuti
  • Patent number: 5263454
    Abstract: An engine for a portable working machine includes a carburetor having a fuel supply device which is to be operated by an intake pipe of a cylinder head provided with an intake valve and an exhaust valve, and a pulse pickup passage which is in fluid communication with the carburetor and which is connected to an inner wall of the intake pipe. The passage is provided at a connection portion between the intake pipe and the carburetor.
    Type: Grant
    Filed: August 18, 1992
    Date of Patent: November 23, 1993
    Assignee: Ryobi Limited
    Inventor: Yoichi Imagawa
  • Patent number: 4971004
    Abstract: In an internal combustion engine having a fuel/air delivery system such as a carburetor (12) supplying a fuel/air mixture for combustion by the engine, a deceleration enrichener system includes a valve (10) operated by engine manifold vacuum (14) and enrichening the fuel/air ratio of the mixture upon deceleration of the engine by decreasing the amount of air in the mixture. The valve (10) closes the idle air inlet port (16) of the carburetor (12) upon deceleration.
    Type: Grant
    Filed: August 24, 1989
    Date of Patent: November 20, 1990
    Assignee: Brunswick Corporation
    Inventor: Ronald E. Keller
  • Patent number: 4957072
    Abstract: A low cost multi cylinder radial aircraft engine is composed of an even number of individually functional, single cylinder slider crank model engines. They are mounted to a plate to form equally spaced radially oriented cylinders. In the preferred embodiment, use of standard, low cost, & mass produced two cycles engines are used. This in conjunction with a novel exhaust muffler and throttle mechanism results in a low cost radial engine. The individual engine shafts surround and are parallel to a central output shaft. Pinion gears on each shaft transfer power to a larger sun gear on the output shaft. This gearing synchronizes opposed pistons to reach top dead center at the same time resulting in vibration free piston motion and perfect balance of the entire engine. Said gearing also provides speed reduction for use of large diameter scale propellers. A rear mounted throttle mechanism controls individual carburetor throttles.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: September 18, 1990
    Inventor: Michael P. Goldowsky
  • Patent number: 4936267
    Abstract: The invention relates to a carburetor for an internal combustion engine and especially for a portable small engine. The carburetor includes a carburetor housing defining an intake pipe and a control chamber which communicates with the intake pipe via intake channels. A fuel-feed line which is closable by an inlet valve opens into the control chamber. The inlet valve includes a valve seat formed in the fuel-feed line and a valve body mounted on a positioning lever which is connected to a membrane defining a wall of the control chamber. The positioning lever can be pivotally actuated to open the inlet valve to admit fuel into the control chamber. An actuating lever is pivotally mounted on the carburetor housing and can be pivoted from a rest position to an active position whereat the actuating lever applies a force against the membrane to displace the latter and pivotally actuate the positioning lever to immediately open the inlet valve when starting the engine.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: June 26, 1990
    Assignee: Andreas Stihl
    Inventors: Reinhard Gerhardy, Michael Wissmann
  • Patent number: 4879975
    Abstract: A modified carburetion and manifold arrangement to enable internal combustion engines to efficiently use fuels such as alcohols having high latent heat of vaporization. A variable venturi carburetion means (30) is combined with two manifolds-one (20) being larger for use during medium to high power operation and a second smaller manifold (24) for starting and low power operation.
    Type: Grant
    Filed: January 19, 1988
    Date of Patent: November 14, 1989
    Assignee: Bennett Automotive Technology Pty., Ltd.
    Inventor: John R. McC. Bennett
  • Patent number: 4757792
    Abstract: An internal combustion engine comprising a crankcase adapted to rotatably support a crankshaft having an axis, the crankcase defining a plurality of crankcase chambers and including a generally flat manifold mounting surface including therein a first series of inlet openings aligned in the direction of the crankshaft axis, and a second series of inlet openings aligned in the direction of the crankshaft axis, the first and second series being laterally offset with respect to the direction of the crankshaft axis, and each of the inlet openings of the first and second series being respectively adapted to feed air to one of the crankcase chambers and having a minor dimension parallel to the crankshaft axis, a major dimension transverse to the crankshaft axis, and a portion overlapping the inlet openings of the other of the first and second series.
    Type: Grant
    Filed: June 7, 1985
    Date of Patent: July 19, 1988
    Assignee: Outboard Marine Corporation
    Inventors: John D. Flaig, Gene F. Baltz, Henry C. Billingsley, David J. Hartke, James A. Holcomb, Chester G. DuBois, Dale L. Taipale