Abstract: A system for feedback control of the air/fuel mixing ratio in an internal combustion engine equipped with a carburetor. The control system has an air/fuel ratio detector of a gas sensor type which provides a feedback signal to a control circuit and a rotary valve which is operated by a stepping motor responsive to a control pulse signal produced by the control circuit to regulate the fuel feed rate so as to nullify a deviation of the detected actual air/fuel ratio from a preset air/fuel ratio. The control system may include two auxiliary air-admitting passages respectively connected to a main fuel passage and a slow fuel passage in the carburetor, and in this case the single rotary valve is designed and arranged so as to simultaneously control the admission of air into both of the two auxiliary air-admitting passages.

Abstract: An air admission device for an inlet manifold of an internal combustion engine in order to obtain improved fuel economy and reduced toxic exhaust emission comprises a closed container or capsule which provides an air expansion chamber and has a fine metering air inlet orifice for entry of atmosphere air into the chamber so as to be cooled therein prior to passage to and along an elongate air outlet tube communicating with the air chamber and adapted in use to be fitted in and through a hole provided therefor in an inlet manifold of an internal combustion engine whereby the container is exteriorly mounted on the manifold and the air outlet tube extends into the manifold in order to admit cool air from the chamber into the manifold for creating turbulence in the flow of a fuel/air mixture through the manifold into the engine.

Abstract: Disclosed herewith an intake air flow rate control system for an internal combustion engine of an automotive vehicle, in which a pulse duty of a control pulse signal is determined corresponding to a reference engine speed and an actual engine speed, the reference engine speed being determined corresponding to an engine or engine coolant temperature. Varying of the control ratio is limited by a means for controlling the varying rate of the control ratio. In the present system, the control ratio as the sum of feedback rate and open loop rate is limited within a given range. The control ratio is limited within a range 10 to 80% preferably of the pulse duty of the control pulse signal. In the given range, a means for controlling air amount flowing through a bypass passage which bypasses a throttle valve provided in an air intake passage, can respond without causing delay.

Abstract: Idle air control apparatus for a vehicle driving internal combustion engine having an air induction passage includes a control valve in the air induction passage controlled by a stepper motor in response to the arithmetic count of applied electrical pulses, a register effective to store a valve control number representing the currently desired position of the control valve, apparatus effective upon occurrence of a predetermined engine loading event to change the valve control number in response thereto, an up-down counter effective to arithmetically count the pulses applied to the stepper motor and thus indicate actual control valve position, a closed loop control effective to compare the contents of the up-down counter and register and apply pulses to the stepper motor at the first predetermined rate to reduce any difference therebetween and a speed trim loop active only during occurrence of a predetermined steady state idle condition to compare actual engine speed with the desired engine idle speed and arit

Abstract: An idling circuit for a carburation device comprises an idling duct for supplying a primary air-fuel mixture downstream of the throttle and a fueled-air line having an adjustable cross-section for circulating an additional quantity of air and primary mixture from upstream to downstream of the throttle. A solenoid valve is energized by pulses having a duty cycle which is controlled so as to keep the engine speed near a set idling speed and so as to increase the amount of mixture supplied to the engine during deceleration at high speed.

Abstract: Apparatus for controlling exhaust gas recirculation in an internal combustion engine employs a first control valve in an exhaust gas recirculation passageway, a second control valve in an air conduit connecting the intake passage to atmosphere through selective restriction means, and a regulating valve responsive to differential vacuum intensities for actuating the control valves. The restriction means comprise a plurality of individual restrictions one or more of which are selectively put into operation depending upon engine operating parameters such as coolant temperature and driving speed.

Abstract: A fuel metering apparatus is shown as having a throttle body with induction passage means therethrough and a throttle valve for controlling flow through the induction passage means, fuel under superatmospheric pressure is metered and such metered fuel is supplied to a fuel discharge nozzle situated within the induction passage means downstream of the throttle valve; a first air flow is supplied to the metered fuel upstream of the fuel discharge nozzle as to cause the metered fuel to at least start to undergo atomization even before being discharged at the discharge nozzle; a second air flow is also supplied to the fuel discharge nozzle as to at idle engine speed flow sonically therethrough, and additional throttling valving means are provided for controlling the air flow to the fuel discharge nozzle.

Abstract: A direct air cooling device for the combustion chamber of the internal combustion engine in an automobile in which an external air suction port member is provided in a path connecting between the carburetor and cylinder in the internal combustion engine and a valve plate is provided adjacent to the suction port member for slidable movement relative to the air suction port member to close and open the port member.

Abstract: An internal combustion engine comprising a vertically extending intake duct which is arranged on the collecting portion of the intake manifold. A throttle valve and a fuel injector are arranged in the intake duct. A bypass passage is formed in the wall of the intake duct for communicating the inside of the intake duct located upstream of the throttle valve with the inside of the intake duct located downstream of the throttle valve.

Abstract: An engine is equipped with a fuel injector in an intake passageway immediately upstream of an intake valve. Air introduced from the intake passageway upstream of a throttle valve is ejected toward a clearance between the valve head of the intake valve and a valve seat, when the intake valve is opened. The ejected air stream strikes against the sprayed fuel injected from the fuel injector to improve the atomization of injected fuel and to form homogeneous air-fuel mixture to be inducted into the combustion chamber of the engine.

Abstract: An electronic control system which electronically controls the air fuel ratio of a mixture being supplied to a gasoline engine in highlands. An orifice device is provided in a passage through which secondary air is supplied to the venturi section of the engine carburetor. An electronic control unit carries out programmed control of the orifice opening of the orifice device in response to the atmospheric pressure and the engine temperature to create a reference pressure. A further electronic control unit drives a second air control valve provided in the secondary air supply passage along a predetermined operating characteristic pattern in response to the difference between the reference pressure and an actual pressure present in the venturi section of the carburetor. A mixture having an optimum air fuel ratio corresponding to the atmospheric pressure can thus be supplied to the engine from the carburetor.

Abstract: Controls for induction systems of fuel injection supplied internal combustion engines in which the induction system flows from an air amount detection means to combustion cylinders, through a main or principal intake passage and a sub-intake or shunt passage. Fuel injection means discharges fuel into the main intake passage in amounts determined by the detection means. The sub-intake passage directs air in a jet stream into the combustion chamber to cause turbulence therein. The sub-intake passage discharges into the combustion cylinders at a substantially different angle from the main intake passage and intersects the discharge from the fuel injection means to improve the fuel air mixture entering the combustion cylinders.

Abstract: A fuel injection system for a mixture-compressing spark-ignition internal combustion engine includes an air suction pipe, a throttle valve located in the pipe, and a member upstream of the throttle valve, which is actuatable by air flowing through the suction pipe so as to move a piston valve to dose a quantity of fuel to a fuel injection nozzle. The system includes a duct which bypasses the throttle valve, the duct having a valve which closes the duct when the throttle valve is closed and when the engine is above the idling speed. The duct valve is operatively connected to a switching member which switches off the ignition system of the engine.

Abstract: An engine rotation speed control system for automotive vehicles having internal combustion engines comprises a solenoid actuated valve having a solenoid coil for controling the flow of air through a throttle bypass passage to the intake manifold during engine idling upon energization of the solenoid coil. The electrical circuit for the solenoid coil is provided with a variable resistance arrangement so that sufficient current will be supplied to the solenoid coil upon engine starting in spite of a voltage drop in the battery at cold temperatures.

Abstract: In combination with a standard carburator for an internal combustion engine having a butterfly type throttle valve, a means is provided having a passageway with another butterfly type valve and the means is disposed between the carburator and the engine wherein the added valve rotates about an axis disposed normal to the axis of rotation of the throttle valve. Linkage means are provided so that both valves open and close together. A cylindrical chamber is provided with one end opened to the atmosphere and a piston is disposed slideably therein. A compression spring within the chamber urges the piston towards the open end to seat against an internal shoulder formed in the cylinder. Two ducts are provided whereby one end of each duct communicates with the passageway in the means, upstream of the valve therein, and one end of the other duct communicates with the passageway downstream of the valve.

Abstract: Apparatus for controlling the rotational speed of an I.C. engine in an idling operation comprises a constant pressure valve, a solenoid valve, and a control signal generator. A constant vacuum pressure produced by the constant pressure valve is modified by atmospheric pressure by means of the solenoid valve which is actuated by a pulsating signal produced in the control signal generator. The pulse width of the pulsating signal is variable in accordance with a detected engine speed. The modified vacuum pressure is coupled to a chamber of a main valve of a conventional boost controlled deceleration device to control the amount of air-fuel mixture supplied to the intake manifold of the engine.

Abstract: A carburetor for an internal combustion engine has a conduit through which air is drawn into the engine, a source of fuel, and means for delivering fuel from the source to the conduit for mixing with air to form an air-fuel mixture combusted in the engine. An improvement comprises a throttle valve positioned at the inlet to the conduit and movable between a closed and an open position to control the quantity of air drawn into the engine.An outlet is defined for the fuel to be delivered to the conduit, fuel discharged through the outlet being atomized by the air flowing past the outlet.The air flowing past the fuel outlet flows therepast at substantially sonic velocities thereby to improve fuel atomization and enhance mixing of the air and fuel.

Abstract: The amount of secondary air flowing through a bypass air passage bypassing the throttle valve of an engine, which is connected to an automatic transmission of a vehicle having an air-conditioner, is controlled by an air control valve disposed in the bypass air passage. The air control valve is controlled on the basis of the result of comparison between a signal indicative of the actual idling rotation speed of the engine detected by the distributor of the engine and a reference signal indicative of a desired idling rotation speed of the engine. The level of this reference signal indicative of the desired idling rotation speed of the engine varies depending on the on-off of the air-conditioner in the vehicle or on the position of the shift lever of the automatic transmission.

Abstract: An air-fuel mixture supplying device for internal combustion engines, in which sonic nozzles are disposed facing each other in such a manner that their center lines lie in the same horizontal and vertical planes so that the fuel ejected from the nozzle is pulverized and mixed with bleed air ejected from the opposing nozzle in optimum condition. During intermittent ejection of fuel, two injector valves inject fuel alternately so that the fuel particles ejected from the opposing nozzles do not collide with each other but only strike against and mix with the bleed air. This eliminates the possibility of fuel particles becoming agglomerated and produces desirable air-fuel mixtures.

Abstract: An air flow amount adjusting system produces an air-fuel mixture of a desirable air-fuel ratio by controlling the direction of movement of a bypass valve mounted in an additional air supply pipe adapted to supply additional air into either the intake system or exhaust system of an internal combustion engine in accordance with an output signal produced from a gas sensor mounted in the exhaust system of the engine and indicative of the air-fuel ratio of the mixture supplied to the engine. A two-level mode signal whose threshold corresponds to the desired air-fuel ratio is produced in accordance with the output signal of the gas detector. After the two-level mode signal has changed from one level to the other level, the movement of the bypass valve is stopped for a certain period of time. If desired, the stopping period of the bypass valve may be changed in accordance with the temperature of the engine.

Abstract: In an internal combustion engine having an exhaust gas recirculation system and an intake air bypass system, a control system is provided which comprises an electric motor arranged to control the flow rate of exhaust gases through the exhaust gas recirculation system under part-throttle or full-throttle conditions of the engine and the flow rate of air through the intake air bypass system under idling conditions of the engine.

Abstract: In a first air flow circuit filtered ram air cooperating with an aspirator draws crankcase vapors from the crankcase of an internal combustion engine. Heavy particulate matter in the crankcase vapor is heated and further vaporized by a heat exchanger cooperating with an exhaust manifold of the engine. A second aspirator draws the vaporized particulate matter back into the original vapor steam of the first air flow circuit. The crankcase vapors mixed with the incoming ram air are then directed into the interior cavity of the carburetor air filter. In a second air flow circuit filtered ram air is directed into the crankcase and carburetor air filter cavity and in a third air flow circuit filtered air is drawn through a variable annular orifice and metered in accord with intake manifold pressure and directed into the engine air intake system below the carburetor throttle plate.

Abstract: An exhaust gas purifying system for an internal combustion engine including at least one combustion chamber connected to an intake port through an intake valve. The system comprises a first passage for passing a portion of exhaust gases discharged from the combustion chamber, a second passage for passing air, a fluid passage, at least one fluid injection nozzle having its one end connected to the fluid passage and the other end extending into the intake port toward the combustion chamber, the fluid injection nozzle adapted to open when the intake valve opens, and means responsive to engine operating condition for connecting the fluid passage to the first passage to permit injection of exhaust gases through the fluid injection nozzle into the combustion chamber during acceleration and for connecting the fluid passage to the second passage to permit injection of air through the fluid injection nozzle into the combustion chamber during normal operation or idling.

Abstract: A secondary intake gas control system for an internal combustion engine having a secondary intake gas supply means for supplying air or a lean mixture to a combustion chamber, comprising an air control valve means provided in a secondary intake passage means of the secondary intake gas supply means to control a supply of the air. The air control valve means comprises a valve member and actuating means therefor. The actuating means is operated by means for sensing a temperature of the engine and means for sensing an opening degree of a throttle valve to open the valve member to communicate the secondary intake passage means with atmosphere when the opening degree of the throttle valve is above predetermined value at a predetermined temperature range of the engine during warming-up thereof.

Abstract: A method and apparatus for varying the fuel ratio of an air-fuel mixture supplied to the carburetor of an internal combustion engine. In a first embodiment, a valve opens and closes a port in an aluminum block between a passage coupled to the PCV and carburetor and a second passage open to the atmosphere. A spring in the second passage modulates the air flow as a function of vacuum pressure and thermally responsive means maintains the valve closed until the engine reaches its operating temperature. In a second embodiment the valve is opened as a function of the wind pressure produced during vehicle movement.

Abstract: A system for controlling the quantity of intake air for an internal combustion engine in response to changes in air density employs a supplementary air intake passage connecting the main air intake passage on the downstream side of the carburetor throttle valve with the atmosphere. An atmospheric pressure compensation valve controls the open cross-sectional area of the supplementary air passage in response to changes in atmospheric pressure. In addition, a vacuum responsive control valve controls the open cross-sectional area of the supplementary air intake passage to pass an amount of air through the supplementary passage proportional to the amount of air passed through the main air intake passage.

Abstract: A diaphragm operated valve bleeds air to the induction passage of a turbocharged engine when the pressure increase across the turbocharger compressor exceeds the particularly high value occurring as the engine throttle is moved from a wide open position; the additional air leans the air-fuel mixture delivered to the engine and thereby prevents a brief pulse of engine power which might otherwise occur, minimizes emission of exhaust gas hydrocarbons and carbon monoxide, and avoids exhaust system backfire noise.

Abstract: An internal combustion engine comprising a carburetor having a throttle valve arranged in the main intake passage. The throttle valve comprises a rigid valve body of a circular shape and at least one deformable valve plate of a semielliptical shape. The inner end of the valve plate is fixed onto the rear face of the valve body so that the peripheral outer edge of the valve plate projects outwardly from the peripheral outer edge of the valve body. When the opening degree of the throttle valve becomes small, the valve plate comes into engagement with the inner wall of the main intake passage and is bent to form a valve space between the valve body and the valve plate. An auxiliary intake passage is additionally provided. The inlet of the auxiliary intake passage is so arranged that it opens into the valve space which is formed when the opening degree of the throttle valve becomes small.

Abstract: An auxiliary air delivery system for an internal combustion engine includes an intake vacuum sensor for generating an intake vacuum signal, a deceleration sensor and a microcomputer in which is stored a set of data representing different values of reference intake vacuum and programmed to retrieve a datum as a function of the length of time from the occurrence of engine deceleration. The retrieved information is used a reference signal with which the intake vacuum signal is compared to provide a control signal. A servo mechanism is provided to allow auxiliary air to be admitted into the manifold at a point downstream of the nearly closed throttle in response to the control signal to reduce the difference between the actual intake vacuum and the reference intake vacuum.

Abstract: An internal combustion engine is provided with an intake vacuum control device through which the upstream and downstream sides of an intake passageway with respect to a throttle valve are communicable with each other, so that additional air is supplied to the intake passageway downstream of the throttle valve during engine deceleration. The intake vacuum control device is composed of a valve member which is normally biased to be closed by a coil spring which is guided by a cylindrical guide member.

Abstract: A fuel economizer for internal combustion engines which increases turbulence of the fuel and air mixture in the carburetor by decreasing the throat of its venturi to a predetermined minimum necessary to induce fuel flow through its fuel jets and then downstream of the venturi adding further atmospheric air for complete combustion.

Abstract: Apparatus is provided for use in an internal combustion engine for increasing the efficiency of the engine and more particularly for improving the carburation of fuel supplied to the engine. The apparatus includes the combination of a heat exchanger in the fuel line for heating liquid fuels supplied to the engine carburetor, a plurality of deflecting blades positioned adjacent to the carburetor air intake for causing turbulation of air entering the carburetor, and an air injector for forcing air into the carburetor throat downstream of the carburetor Venturi section and to increase the proportion of air in the fuel mixture.

Abstract: A charge forming system is disclosed which monitors a parameter of engine combustion efficiency, such as power output, and derives a signal indicating the sense of power change. A fuel mixture control system responds to an indication of increasing power to continually and progressively lessen the fuel/air ratio to attain the leanest possible mixture consistent with maximum instantaneous engine power output. In a preferred embodiment liquid fuel is vaporized before delivery to the engine combustion chambers, and a variable orifice provided to enhance the flow characteristics of the vaporized fuel.

Abstract: A fuel supply device for an internal combustion engine having at least two groups of combustion chambers, each group having a separate exhaust pipe, comprises a carburettor which delivers a mixture whose air/fuel ratio is adjusted responsive to the composition of the exhaust gases of the "richer" group. The carburettor is connected to a manifold having two branches each associated with one group. The branch feeding the "leaner" group is provided with an air/fuel ratio correction circuit comprising a solenoid valve controlled by a circuit whose input detector is located in the exhaust pipe of the "leaner" group.

Abstract: An internal combustion engine comprising a combustion chamber and an accumulation chamber which are interconnected to each other via an accumulation valve. The accumulation chamber is filled with catalyzer pellets for reforming the combustible mixture accumulated in the accumulation chamber. The accumulation valve is opened during the compression stroke. In the first half of the compression stroke, a jet of the reformed combustible mixture is spouted into the combustion chamber from the accumulation chamber to create a strong swirl motion in the combustion chamber. In the latter half of the compression stroke, the combustible mixture in the combustion chamber flows into the accumulation chamber where the combustible mixture accumulates under high pressure, and the mixture is then spouted into the combustion chamber at the next cycle, from the accumulation chamber.

Abstract: A compressive pressure augmentation device, operable when the combustion chamber in a vehicle engine is directly air-cooled and the vehicle is running at a constant speed, in which an air supply pipe and air cleaners are connected together by means of an air suction pipe. A valve is provided in the air suction pipe. Electromagnetic coils are provided to selectively fully open and partially open the valve.