Abstract: In an electrically-actuated throttle device for a general-purpose engine, supply of current to the throttle motor and choke motor for moving the throttle valve and choke valve is started when cranking is detected after activation (power-up) of the electronic control unit (ECU). In other words, supply of current is not started simultaneously with activation of the ECU but is delayed until cranking is detected. Owing to this configuration, no power of the battery is consumed unnecessarily between power-up and starting of the engine. Decrease in the power supplied to the starter motor is therefore prevented, thereby improving the starting performance of the engine. In addition, even if starting of the engine is not commenced after power-up, the battery is not likely to be excessively discharged.

Abstract: To inhibit an after burn phenomenon, an accelerating apparatus (P) is sectioned into a pump chamber (23) and a pressure receiving chamber (24) by a partition body (20), an acceleration fuel intake path (25) and an acceleration fuel discharge path (28) are open to the pump chamber (23), and a fuel discharge path (30b) is open to a float chamber (8), a negative pressure introducing path (30a) is open to the pressure receiving chamber (24), a pump spring (31) is provided compressedly in the pressure receiving chamber (24), and a valve body (34) is formed by a jet opening and closing valve portion (34a) opening and closing an opening portion (6a) of a main fuel jet (6) when an engine operates and stops respectively by a solenoid apparatus (S), and a discharge path opening and closing valve portion (34b) opening and closing the fuel discharge path (30b) when an engine stops and operates respectively, and synchronously moves with a movable core (17) of the solenoid apparatus (S).

Abstract: A method is for controlling the metering of fuel in a fuel system (30) of an internal combustion engine (1) which is to be started manually. This control is with a currentless open electromagnetic valve (21). The electromagnetic valve (21) is only switched into the closed state when a supply voltage (Uv) is applied and current flows. Within a blocking time (47), which is pregiven by an engine control (13), a supply voltage (Uv) is switched onto the excitation coil of the electromagnetic valve (21) only and the valve (21) is supplied with current only when an underpressure is present in the intake channel (11) of the fuel system (30); whereas, in the remaining time span (50) of the blocking time (47), wherein no underpressure is present, the control unit (20) switches off the supply voltage (Uv) and the valve (21) is in the currentless open state.

Abstract: The invention relates to a fuel metering device comprising a fuel chamber, a fuel inlet which can be opened and closed and leads to the fuel chamber, and at least one fuel outlet leading from the fuel chamber to a suction channel of an internal combustion engine. Part of a wall of the fuel chamber consists of a first element which can be moved according to a pressure difference between a pressure in the fuel chamber and an ambient air pressure, the element being coupled to a closing element for opening and closing the fuel inlet. The said fuel metering device enables a quantity of fuel, which is supplied to the suction channel for a pre-defined operating position of the internal combustion engine, to be automatically regulated according to the ambient air pressure.

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.

Abstract: A carburetor arrangement is provided for an internal combustion engine that is to be started with a pull cord. A fuel channel that is connected with a fuel-filled storage space opens into and supplies fuel to an intake channel portion as a function of the underpressure in the intake channel portion. The underpressure in the intake channel portion is increased during the start-up process via a start-up mechanism. To keep the engine ready to run with the start-up mechanism engaged, a control valve is disposed between the storage space and where the fuel channel opens into the intake channel portion. The control valve is opened or closed by a control unit as a function of the speed of the internal combustion engine.

Abstract: An object of the present invention is to maintain stable air-fuel ratio on a venturi type fuel supply device, irrespective of the external load such as air-conditioner and electrical load, and to provide stable engine speed on idling state. A venturi type fuel supply device comprises a venturi chamber located in the upstream of a throttle valve and a passage for supplying air-fuel mixture gas into the venturi chamber. The passage is further equipped with a variable air bleeder valve for taking in air. When the operating state of the external load of the engine changes, the opening of the air bleeder valve is adjusted in accordance with the change so as to control the air-fuel mixture ratio of the mixture gas incoming from the passage into the venturi chamber.

Abstract: A control apparatus for an internal combustion engine can limit a vehicle speed within a permitted maximum speed with high accuracy by preventing a response delay of a throttle opening with respect to an amount of intake air while avoiding deterioration of driveability. The apparatus includes a target opening calculating section that calculates a target opening of an electronic throttle valve from an accelerator opening, and an electronic control section that drives the electronic throttle valve to make the throttle opening coincide with the target opening. The target opening calculating section includes a correction factor calculating section that calculates a correction factor for correcting the target opening.

Abstract: A diaphragm carburetor is disclosed wherein a mechanism for varying the fuel flow rate through the carburetor for delivery to the engine can be controlled by electronic feedback based on engine performance. A permanent magnet/wire coil assembly is attached to the diaphragm controlling the opening to the metering chamber within the carburetor. The assembly responds to commands based on engine performance and can vary the size of the opening to the metering chamber. In this way, the fuel flow rate through the carburetor can be modified to obtain the optimal fuel/air ratio for peak performance of the engine.

Abstract: An apparatus and method for adjusting a quantity of fuel delivered to an engine when an engine operating state transitions is provided. The apparatus and method includes determining a current steady-state quantity of fuel to be delivered to the engine and add a transitory quantity of fuel, based on a difference between a previous steady-state quantity of fuel delivered and the current steady-state quantity of fuel to be delivered, to the current steady-state quantity of fuel for a period of time following initiation of the transition. The invention also provides an apparatus and method by which an operator may adjust the amount of fuel delivered during an engine operating state transition.

Abstract: A diaphragm carburetor is disclosed wherein a mechanism for varying the fuel flow rate through the carburetor for delivery to the engine can be controlled by electronic feedback based on engine performance. A permanent magnet/wire coil assembly is attached to the diaphragm controlling the opening to the metering chamber within the carburetor. The assembly responds to commands based on engine performance and can vary the size of the opening to the metering chamber. In this way, the fuel flow rate through the carburetor can be modified to obtain the optimal fuel/air ratio for peak performance of the engine.

Abstract: An internal combustion engine 10 comprises a cylinder 12 including a combustion chamber 17 having at least two air input ports 31, 51 and a piston 18 movable in cylinder 12 so as to vary the volume of combustion chamber 17. An air supply system 20 for supplying combustion air to cylinder 12 comprises first and second air intake systems 30, 50, each including an air passage 33, 53 and a valve 40, 60 controlling air passage through their respective port 31, 51. Each valve is controlled such that second valve 60 is open longer than first valve 40. An air flow valve controller 72 responsive to engine speed and air pressure downstream of a throttle valve 24 moves a valve 81 in second passageway 53 to permit greater air flow through second air passage 53 at higher engine speed and at air pressure less than steady state air pressure for the engine speed.

Abstract: A diaphragm carburetor is disclosed wherein a mechanism for varying the fuel flow rate through the carburetor for delivery to the engine can be controlled by electronic feedback based on engine performance. A permanent magnet/wire coil assembly is attached to the diaphragm controlling the opening to the metering chamber within the carburetor. The assembly responds to commands based on engine performance and can vary the size of the opening to the metering chamber. In this way, the fuel flow rate through the carburetor can be modified to obtain the optimal fuel/air ratio for peak performance of the engine.

Abstract: A garment for a personal cooling or warming system, the garment comprising a carrier formed in the shape of the garment, and a bladder comprising at least two channel segments, wherein the channel segments have a substantially flat configuration so as to improve thermal efficiency.

Abstract: An apparatus and method for adjusting a quantity of fuel delivered to an engine when an engine operating state transitions is provided. The apparatus and method includes determining a current steady-state quantity of fuel to be delivered to the engine and add a transitory quantity of fuel, based on a difference between a previous steady-state quantity of fuel delivered and the current steady-state quantity of fuel to be delivered, to the current steady-state quantity of fuel for a period of time following initiation of the transition. The invention also provides an apparatus and method by which an operator may adjust the amount of fuel delivered during an engine operating state transition.

Abstract: An internal combustion engine having a crankcase, a cylinder connected to the crankcase, a compressed air assisted fuel injection system connected between the crankcase and the cylinder, and a reciprocating piston head located in the cylinder. The improvement comprises a fuel delivery system having two carburetor sections with two interconnected rotatable shafts.

Abstract: An oxygen sensor device consisting a cylindrical tube of a ceramic solid electrolyte having an oxygen ion conducting property, a reference electrode formed on an inner surface of the cylindrical tube, and a measuring electrode formed on an outer surface of the cylindrical tube at a position at least opposed to the reference electrode, wherein a ceramic layer is formed on the outer surface of the cylindrical tube, the ceramic layer having an opening portion for exposing the surface of the measuring electrode and incorporating a heat-generating member therein, the heat-generating member being buried surrounding the opening portion. The oxygen sensor device as a whole has a cylindrical shape relaxing the concentration of thermal stress and exhibiting excellent thermal shock resistance. With the heat-generating member being buried near the sensing portion, the sensing portion is heated up to a predetermined activating temperature within short periods of time exhibiting an excellent sensor response.

Abstract: A fuel shut off solenoid device of a carburetor has a solenoid chamber which typically fills with fuel. When the solenoid device is energized, fuel flows from a fuel chamber into a mixing passage of the carburetor to mix with air. During the energized state, heat from the solenoid tends to vaporize the fuel within the solenoid chamber. Also when energized, the solenoid device is held in a retracted position whereby a head at a distal end of the shaft mates with or seals to a washer which in turn seals to an upward face of the encasement of the fuel shut off solenoid device. Thus the potential migration of large vapor bubbles from the solenoid chamber to the mixing passage of the carburetor is eliminated, providing a smoother idling or running engine at light loads.

Abstract: The present invention involves a carbureted fuel system for an internal combustion engine for small utility implements. The engine includes a crankcase with a cylinder bore. The crankcase rotatably supports a crankshaft having a flywheel and a magnet disposed on an outer periphery of the flywheel. The crankshaft is also connected to a reciprocating piston disposed in the cylinder bore. A cylinder head is attached to the crankcase over the cylinder bore, and a carburetor is disposed on the cylinder head. The carburetor is in communication with a fuel supply and an air inlet. The carburetor includes a mixing chamber in which the fuel and air are mixed together and then introduced into the manifold and eventually into the cylinder via a valve for combustion therein. In communication with the main passage of the carburetor is a secondary air inlet in which is disposed an air bleed device, such as a solenoid or PZT operated actuator, which is controlled by an electronic control unit.

Abstract: The present invention involves a carbureted fuel system for an internal combustion engine for small utility implements. The engine includes a crankcase with a cylinder bore. The crankcase rotatably supports a crankshaft having a flywheel and a magnet disposed on an outer periphery of the flywheel. The crankshaft is also connected to a reciprocating piston disposed in the cylinder bore. A cylinder head is attached to the crankcase over the cylinder bore, and a carburetor is disposed on the cylinder head. The carburetor is in communication with a fuel supply and an air inlet. The carburetor includes a mixing chamber in which the fuel and air are mixed together and then introduced into the manifold and eventually into the cylinder via a valve for combustion therein. In communication with the main passage of the carburetor is a secondary air inlet in which is disposed an air bleed device, such as a solenoid or PZT operated actuator, which is controlled by an electronic control unit.

Abstract: An aspirating thermodynamic valve capable of controlling the flow of fuel mixture and air from the carburetor to the crankcase of a two-stroke engine includes a hollow body placed between the joint of the crankcase and the joint of the carburetor, along with suitably interpositioned seals. The valve includes a bush, the extremity of which is placed inside of the body and is cut out according to a predetermined inclination; furthermore, it includes a wall which is hinged by one end and is capable of closing the extremity.

Abstract: An internal combustion engine is fueled with a controlled mixture of natural gas and air which mixture is regulated by a regulator responsive to an electronic controller. In the event of a system failure with the electronic controller shutting down, a backup regulator automatically bypasses the normal regulator to provide temporary operation with a predetermined acceptable constant gas mixture.

Abstract: A method and device for controlling the fuel and/or air supply to an internal combustion engine in the fuel section thereof, such as a carburetor or a fuel injection system, so that the mixture ratio (A/F ratio) is adjusted automatically to a desired level in response to various operational conditions. In a rotational-speed feed back regulating circuit, a feed-back control unit which receives information on the rotational speed from the engine briefly adjusts an adjustment device to provide a brief change of the mixture ratio and, in connection with the brief A/F/ ratio change, a number of revolution times are measured. At least one revolution time refers to a rotational speed that is essentially unaffected by the A/F ratio change and at least one revolution time refers to a rotational speed that is affected by the A/F ratio change. On the basis of these revolution times, at least one difference in revolution times between affected and unaffected rotational speeds is computed.

Abstract: An electronically controlled type floatless carburetor includes a fuel regulating chamber from which fuel is delivered to a main fuel passage including a main jet and a pilot fuel passage including a pilot jet as a main diaphragm is actuated. A main solenoid valve is disposed at the intermediate position of the main fuel passage located on the downstream side of the main jet. In addition, a pilot solenoid valve is disposed at the intermediate position of the pilot fuel passage located on the downstream side of the pilot jet. Operation of each of the main solenoid valve and the pilot solenoid valve is controlled by an electronic controlling circuit into which various parameters are inputted so as to assure that main fuel and pilot fuel are ejected in a suction passage from a main nozzle and a slow system ejection port while they are well adapted to all operational states of an engine.

Abstract: An electronically controlled type floatless carburetor includes a fuel regulating chamber from which fuel is delivered to a main fuel passage including a main jet and a pilot fuel passage including a pilot jet as a main diaphragm is actuated. A main solenoid valve is disposed at the intermediate position of the main fuel passage located on the downstream side of the main jet. In addition, a pilot solenoid valve is disposed at the intermediate position of the pilot fuel passage located on the downstream side of the pilot jet. Operation of each of the main solenoid valve and the pilot solenoid valve is controlled by an electronic controlling circuit into which various parameters are inputted so as to assure that main fuel and pilot fuel are ejected in a suction passage from a main nozzle and a slow system ejection port while they are well adapted to all operational states of an engine.

Abstract: A single cylinder engine is equipped with a carburetor having an electrically controlled air bleed control valve. A microcomputer of an electronic controller calculates a target opening timing and a target opening time period of the air bleed control valve. The microcomputer, receiving a rotation pulse from a rotation sensor indicative of an engine rotational position, opens the air bleed control valve at the calculated target opening timing and for the calculated target opening period so that the air bleed control valve controls an amount of air-bleeding which in turn controls an air-fuel ratio of mixture supplied to the engine.

Abstract: An electronically controlled type floatless carburetor includes a fuel regulating chamber from which fuel is delivered to a main fuel passage including a main jet and a pilot fuel passage including a pilot jet as a main diaphragm is actuated. A main solenoid valve is disposed at the intermediate position of the main fuel passage located on the downstream side of the main jet. In addition, a pilot solenoid valve is disposed at the intermediate position of the pilot fuel passage located on the downstream side of the pilot jet. Operation of each of the main solenoid valve and the pilot solenoid valve is controlled by an electronic controlling circuit into which various parameters are inputted so as to assure that main fuel and pilot fuel are ejected in a suction passage from a main nozzle and a slow system ejection port while they are well adapted to all operational states of an engine.

Abstract: A method for controlling an engine for a model and a device therefor capable of improving throttle response. Feed of fuel to the engine is increased during acceleration of the engine and decreased during deceleration thereof. This permits a rotational speed of the engine to be smoothly and rapidly varied, to thereby reduce vibration of the engine and prevent knocking and breathing of the engine. Also, adjustment of a trim provided on a side of a controller leads to adjustment of a needle valve, so that the adjustment may be facilitated.

Abstract: A method and device for controlling the fuel and/or air supply to an internal combustion engine in the fuel section thereof, such as a carburetor or a fuel injection system, so that the mixture ratio (A/F ratio) is adjusted automatically to a desired level in response to various operational conditions. In a rotational-speed feed back regulating circuit, a feed-back control unit which receives information on the rotational speed from the engine briefly adjusts an adjustment device to provide a brief change of the mixture ratio and, in connection with the brief A/F/ratio change, a number of revolution times are measured. At least one revolution time refers to a rotational speed that is essentially unaffected by the A/F ratio change and at least one revolution time refers to a rotational speed that is affected by the A/F ratio change. On the basis of these revolution times, at least one difference in revolution times between affected and unaffected rotational speeds is computed.

Abstract: An electronically controlled type floatless carburetor includes a fuel regulating chamber from which fuel is delivered to a main fuel passage including a main jet and a pilot fuel passage including a pilot jet as a main diaphragm is actuated. A main solenoid valve is disposed at the intermediate position of the main fuel passage located on the downstream side of the main jet. In addition, a pilot solenoid valve is disposed at the intermediate position of the pilot fuel passage located on the downstream side of the pilot jet. Operation of each of the main solenoid valve and the pilot solenoid valve is controlled by an electronic controlling circuit into which various parameters are inputted so as to assure that main fuel and pilot fuel are ejected in a suction passage from a main nozzle and a slow system ejection port while they are well adapted to all operational states of an engine.

Abstract: A small engine carburetor with manually controlled choke and throttle valves and associated idle ports and main metering nozzle supplied with fuel from a common metering chamber. The A/F is automatically adjusted by a solenoid operated poppet valve and/or gear driven needle valve and cooperative electronic control circuitry and system components built-in to the carburetor. A combined accelerator pump and idle circuit shut-off mechanism is also built-in and mechanically operated by the throttle shaft so that only the main nozzle supplies fuel when the engine is running above fast idle. A mechanical choke/throttle interlock mechanism also prevents partial choking when the engine is running above fast idle, and throttle operation above fast idle when choking.

Abstract: A mixture preparation device for double-feed engines having a body (11) in which two ducts are provided, namely a first duct (12) for air feed to the crankcase and a second duct (13) connected to an injection device. Throttle elements (10, 35) are provided for the two ducts (12, 13). In the second duct (13) connected to the injection device there is provided an air-fuel mixture emission unit (29-34) adjustable in its degree of opening, the opening being controlled by transmission elements (49, 50) operationally connected to a shaft (36, 43) carrying one of the throttle elements (35) positioned within the first duct (12) for air feed.

Abstract: In a low pressure continuous flow fuel injection system for an internal combustion engine, an electric fuel pump (18) is energized with a variable duty cycle to vary the pumped volume output of the pump according to engine fuel requirements. The duty cycle is varied to energize the pump to pump substantially only the amount of fuel required by the engine, such that at idle or low engine speed, the pump is energized a lower percentage of the time than at high engine speed. Fuel flow through the fuel injector (12) is continuous, but energization of the pump is not, such that the pump is not pumping at full capacity when unneeded. An electric idle air control valve (54) is also energized with a variable duty cycle to vary the amount of bypass idle air supplied to the intake manifold (10).

Abstract: A sensor for determining the stoichiometric air to fuel ratio (A/F) at the intake of an internal combustion engine is based on a capacitive device in the exhaust stream which can be used to measure the change in the workfunction of an appropriate material which occurs at the stoichiometric point and which forms one of the two interacting elements of the capacitor. To measure A/F over an extended range about stoichiometry the material whose workfunction changes is made the working electrode of an oxygen concentration cell using a solid electrolyte. Oxygen pumping to and from that surface can change the magnitude of the workfunction allowing for a feedback control method for keeping the workfunction constant despite changes in the A/F so that the required pump current becomes a measure of the A/F.

Abstract: There is provided a carburetor having a main air passageway extending between an air inlet and an air outlet and having a narrower venturi portion intermediate the air inlet and air outlet, a throttle valve being located near the air outlet, and a second narrower passageway extending substantially parallel to the main air passageway, the second narrower passageway having an air inlet from the main air passageway, a fuel inlet to the second passageway downstream from the inlet, and a first outlet from the second passageway to the main air passageway proximate the venturi portion and a second outlet from the second passageway intermediate the venturi portion and a throttle valve, the main air passageway having a flange extending inwardly from said wall at a downstream end of the venturi portion. The carburetor provides better fuel economy and efficiency.

Abstract: An integrated air/fuel sensor is disclosed for use with a gaseous fuel internal combustion engine. The sensor includes a housing having a mass air flow sensor which provides an output signal representative of the mass of air flow through the mass air flow sensor. Similarly, a mass gas sensor is also contained in the housing which provides an output signal representative of the mass of gas flow through the mass gas flow sensor. The integrated air/fuel sensor is mounted to the air and fuel supply system for the engine upstream from the internal combustion engine. The output signal from both flow sensors are provided as input signals to a circuit which calculates the air/fuel ratio to the engine and provides an output signal representative thereof to the fuel management system for the engine.

Abstract: A fuel management system is provided for use with an internal combustion engine which utilizes gaseous fuel as the fuel source. A mass gas flow sensor is fluidly connected between the gaseous fuel source and the engine. A mass air flow meter is similarly provided in series with an air intake for the internal combustion engine and the outputs from both flow meters are provided as input signals to a microprocessor based control circuit. The control circuit calculates the air/fuel ratio of the combustible charge provided to the engine and generates appropriate output signals to a valve arrangement in series between the source of gaseous fuel and the internal combustion engine to vary the air/fuel ratio to obtain a desired engine performance as a function of the engine operating condition. An air/fuel ratio sensor is also in fluid communication with the exhaust gas stream from the engine and provides an output signal representative of the actual air/fuel ratio to the control circuit.

Abstract: In a method and device for controlling a carburetor (1) of an i. c. engine, the A/F ratio thereof is automatically adjusted to a preferred level during varying operating conditions. An adjusting means (5) is continuously actuated by a first control unit (4) of a first control circuit (3) to provide a A/F ratio having a modified dependency on the speed of rotation. An adjusting means (9) is periodically actuated for a short period by a second control unit (7) of a second control circuit (6), said second control unit receiving speed information (8) from the engine (2), to provide a short-term change of the mixture ratio, and the change of speed of rotation caused thereby is measured. With regard to the obtained result and stored information the second control unit (7) performs an adjustment of the mixture ratio by a predetermined step towards leaner or richer mixture by actuating an adjusting means (5).

Abstract: A sensor for determining the stoichiometric air to fuel ratio (A/F) at the input to the cylinders of an internal combustion engine which is based on measuring the change in the workfunction of a material which occurs when the oxidizing and reducing species in the adjacent gas phase are at or near their stoichiometric ratio. In one method the sensor includes a material which is capable of thermionically emitting alkali metal or other appropriate ions into an exhaust gas atmosphere where they are subsequently collected by a nearby collector electrode and the magnitude of the emission current is measured. The interaction of the emitting surface with the gas phase reversibly changes the workfunction of the emitting surface from large to smaller values as that gas phase is varied through the stoichiometric ratio with respect to the amounts of the oxidizing and reducing species in the gas.

Abstract: For adjusting the air/fuel ratio (A/F) of an i. c. engine having an electrically adjustable carburetor, an electronic detector and control unit is used to which current is supplied by an ignition magnet or generator and which comprises a tachometer, data processing means, an electronic memory, and a control unit for adjusting said ratio. The first derivative of the speed of revolution of the engine is used as a parameter for the adjustment. According to the invention, the adjustment is made after a period of time during which the speed of the engine has been generally constant. Generally constant speed is detected by calculating the average value of said derivative, such that the speed of revolution of the engine is considered to be generally constant when said average value is approximately zero.

Abstract: An outboard motor having a charge forming system including an enrichment fuel device that supplies additional fuel and air to the engine for starting and warm up. The fuel and air are supplied from one charge former of the engine and are delivered to a balance passage of a spacer between the charge formers and the intake manifold. The additional air supplied by the enrichment device is drawn from an air circuit of the carburetor so as to reduce the discharge pressure of the fuel discharge circuits of the carburetor to draw additional enrichment fuel from those discharge circuits when the enrichment device is in operation.

Abstract: A fuel supply system for selectively increasing the fuel supply to an internal combustion engine suitable for use in outboard motors and the like in response to sensed operating conditions of the engine, such as engine start-up, engine acceleration, and engine knocking. A series of engine operating condition sensors, such as an engine temperature sensor, an engine throttle opening sensor, an engine crank angle sensor, and an engine knocking sensor, detects the occurrence of engine start-up, engine acceleration, or engine knocking and sends a signal to a micro-computer to operate an electromagnetic pump and electromagnetic control valve to supply an additional amount of fuel to the fuel supply passage of the engine.

Abstract: A control system for the carburetor of an internal combustion engine wherein the carburetor has a choke valve disposed at the inlet of the carburetor induction tube and the choke valve is operated automatically by an actuator. The actuator for the control includes a pulse-width modulator in which the pulse width or the degree of modulation is influenced by a family of characteristics stored in a programmable memory, the memory applying signals to the pulse-width modulator for pre-specified air-fuel mixtures in accordance with engine speed.

Abstract: An idling engine speed control apparatus for an engine with a carbureter having a main fuel passage for supplying fuel to an engine and a slow fuel passage for supplying fuel to the engine in accordance with an opening degree of a throttle valve mounted within the carbureter. There are provided an opener for opening and closing the throttle valve, and a bypass having a shutter valve, the bypass opening at the downstream of the throttle valve of the carbureter. The engine is subjected to an idle-up control by using at least one of the opener and the shutter valve of the bypass. The opener causes the throttle valve to open by a predetermined amount in accordance with the load conditions except that of an air conditioner, and the shutter valve of the bypass is opened when the air conditioner is used. The opener may cause the throttle valve to open for a predetermined time immediately after the start of using the air conditioner.

Abstract: A diaphragm type carburetor comprising a main body portion defining a venturi having an air intake side and an engine outlet side. The carburetor has a throttle shutter mounted within the venturi between the air intake side and the engine outlet side, and a metering chamber supplies fuel into the venturi via a main discharge port. The main discharge port opens into the venturi on the air intake side of the throttle shutter. A monitoring means (FIG. 3) is provided to monitor an engine parameter and an electrically controlled valve means is provided to adjust the fuel flow through the main discharge port into the venturi. The valve means is responsive to an electrical signal generated by the monitoring means in response to the engine parameter.

Abstract: The invention is an arrangement for controlling the air/fuel ratio A/F in a carburetor. The arrangement can be connected to a membrane or a float carburetor and controls the mixture ratio by influence on the differential pressure .DELTA.p between the fuel chamber (18) and the venturi (12). The subpressure from some part of the intake system (16) is passed through a magnetic valve (32) activated by pulses of a variable length. In order to equalize the whole or part of the subpressure there is an opening (33) with inlet from the atmosphere to the valve. By varying the pulse length a changeable subpressure is obtained which is connected in lieu of the regular atmospheric ventilation of the carburetor.

Abstract: A fuel supply control system for an engine associated with a transmission for transmitting the engine output power to driving wheels of a vehicle increases the amount of fuel to be supplied to the engine when the engine is in a particular operating condition in which relatively large engine output power is required. The fuel supply control system receives a signal from a switch which is switched over according to whether the engine is associated with a manual transmission or an automatic transmission, and controls the amount by which the fuel to be supplied to the engine is increased when the engine is in the particular operating condition so that the amount is smaller when the engine is associated with an automatic transmission than when the engine is associated with a manual transmission.

Abstract: A fuel control system for an internal combustion engine includes means for pneumatically amplifying sensed air flow pressure differential through an air intake venturi between a first combustion air pressure sensor outside the venturi and a second combustion air pressure sensor in the venturi. Pressure at the inner end of the second pressure sensor is reduced by altering the air flow path to create a vacuum at the inner end of the second pressure sensor relative to the remaining air flow through the venturi. A throttle plate in the venturi has a by-pass hole therethrough directing air flow along a given direction past the inner end of the sensor and through the by-pass hole when the throttle plate is in the idle position. The given direction of air flow past the inner end of the sensor prevents air flow into the inner end of the sensor tube to prevent an increase of sensed pressure thereat, and instead creates a vacuum to pull air out of the inner end of the sensor tube, to reduce pressure thereat.

Abstract: In a method and an apparatus for open-loop and closed-loop control of operating characteristic quantities of an internal combustion engine, it is proposed that the anticipatory or pilot control area, which is variable by means of learning, be embodied such that in a factor characteristic field associated with a basic characteristic field, not only the particular support point but with decreasing influence outward the area surrounding it as well are changed by the carry-over of an averaged regulating factor value. Alternatively, or preferably combined therewith, the factor characteristic field is replaced by at least two correcting characteristic fields, which have larger inclusion areas, overlapping one another, for each support point, so that even in the event of fluctuations of input quantities about a border of an area, at least one of the correcting characteristic fields will be addressed.

Abstract: An arrangement for regulating the combustion air mixture in the case of a gas engine operating on a lean fuel, and in the induction line of which there is an air-gas mixer, a lambda regulator being provided and following which there is, for varying the combustion air proportions, a positioning device which adjusts the air-gas mixer, and also an output measuring device for ascertaining the engine output. A manometer determines the actual value of the mixture pressure upstream of the inlet valves of the engine, linked with the value for the combustion air proportions. By adjusting the combustion air proportions, it is possible to regulate the mixture pressure to the output dependent desired value for the mixture pressure as ascertained in a device within the lambda regulator.