Abstract: An air intake device comprising a main air intake passage and an auxiliary air intake passage. The main air intake passage interconnects the air cleaner to the engine cylinders. The auxiliary air intake passage is connected to the air cleaner at one end thereof and to the main air intake passage at the other end thereof. The equivalent pipe lengths of the main air intake passage and the auxiliary air intake passage are almost the same. A control valve actuated in response to the engine speed is arranged in the other end of the auxiliary air intake passage. The valve body of the control valve has a conically-shaped convex front face and a conically-shaped convex rear face.

Abstract: A system including a throttle body communicating intake air to the intake manifold of an engine, the throttle body including a movable throttle plate. A vacuum responsive idle speed bypass valve is used to bypass intake air around the throttle plate and into the intake manifold, a vacuum responsive EGR valve is used for regulating the amount of exhaust gas permitted to be recirculated into the intake manifold, a single electric vacuum regulating (EVR) communicated to a vacuum inport port, the idle speed bypass valve and EGR valve to be employed to vary the degree of manifold vacuum communicated thereto.

Abstract: A secondary air intake system for adding air to the intake of an internal combustion engine includes an air control valve for changing the open area of a secondary air intake passage. The air control valve is opened and closed from a first and second pressure supply means. A first pressure supply means gradually supplies the first and second control pressure to operate the air control valve and open and close the secondary air intake passage in response to an air-fuel ratio signal. The first pressure supply means also supplies the second control pressure independent of the air-fuel ratio signal during a predetermined engine operating state. A second pressure supply means supplies the second control pressure separately of the first pressure supply means during a predetermined engine operating state.

Abstract: A secondary air intake system is used in an internal combustion engine. The system supplies secondary air through a first and a second secondary air passage. The first secondary air passage includes a first vacuum operated air control valve. The second secondary air passage includes a second vacuum operated air control valve and an electrically operated air control valve positioned in series. A vacuum control which includes an electrically operated vacuum control valve operates the first and second vacuum operated air control valves to vary the effective area of the two air passages. An air-fuel ratio control which includes an intake air temperature sensor, an exhaust gas oxygen concentration sensor and a throttle plate vacuum sensor determines the engine air-fuel ratio to intermittently open and close the second electrically operated air control valve to open and close the second secondary air passage.

Abstract: A method of controlling an operating amount of an operation control means for controlling the operation of an internal combustion engine having an intake passage and an intake air quantity control means for adjusting the opening area of the intake passage to thereby regulate the quantity of intake air of the engine. The operating amount of the operation control means, such as a fuel injection control means, is controlled to required values dependent on operating conditions of the engine, in synchronism with generation of pulses of a predetermined control signal. When the engine is operating in a predetermined low load condition, a desired operating amount of the control means is determined on the basis of the detected value of the intake passage opening area.

Abstract: A secondary intake air supply system for internal combustion engines having two vacuum operated air control valves in parallel in a single secondary air supply line to the intake manifold. One of the air control valves is controlled by a vacuum control valve to open and close gradually to avoid abrupt changes in the air fuel mixture to the engine, upon changes in vehicle operation. Electromagnetic valves operated by a control circuit responsive to both an exhaust gas sensor and a throttle position also control the secondary air supplied through the two air control valves.

Abstract: The so called air intake side secondary air supply system for an internal combustion engine, having first and second secondary air supply passages leading to an intake air passage on downstream side of a throttle valve is provided with a delay device in the second secondary air supply passage on upstream side of an open/close valve disposed in the second secondary air supply passage, and a pressure supply passage which provides communication between a pressure chamber of an air control valve disposed in the first secondary air supply passage and a part of the second secondary air supply passage between the delay device and the open/close valve. Thus, one of the secondary air supply passages is utilized as a passage for introducing a vacuum into the pressure chamber of the air control valve and the open/close valve is used as a switch device for switching over between the atmospheric pressure and the vacuum which are to be introduced into the pressure chamber of the air control valve.

Abstract: An air intake side secondary air supply system for an internal combustion engine equipped with an automatic choke valve and a fast idle system is provided with a detection means for detecting an operating condition of the engine in which the fast idle system is operated to open the throttle valve. The supply of the secondary air for the feedback control is stopped when a detection signal is produced by the detection means so that the feedback control of the air-fuel ratio is suspended when the throttle valve is opened by means of the fast idle system while the choke valve may be substantially closed. Thus, a hunting of the engine speed which might have occured after the start of the feedback control is prevented.

Abstract: An air intake side secondary air supply system for an internal combustion engine equipped with an exhaust gas recirculation (EGR) system, employing a single source of control pressure for supplying a control pressure both into an air control valve for controlling the amount of the air intake side secondary air and an EGR control valve for controlling the amount of exhaust gas recirculation. The system is provided with a delay means for delaying the transmission of a fluctuation of pressure in the pressure chamber of the air control valve to a pressure chamber of the EGR control valve, thereby preventing adverse effects on the EGR operation due to an interaction between the air intake side secondary air supply system and the EGR system.

Abstract: An air intake side secondary air supply system for an internal combustion engine provided with an air/fuel ratio feedback control operation, comprises a pressure responsive air control valve which controls the communication through a secondary air supply passage, i.e., the amount of the air intake side secondary air supplied to the engine. A first control pressure for opening the air control valve and a second control pressure for closing the air control valve is alternately supplied to the air control valve in accordance with a detected state of the air/fuel ratio of the engine. The system is further provided with a device for respectively controlling the speed of the supply of the first and second control pressure, which in turn causes the variation of the speed of the air/fuel ratio control.

Abstract: An intake secondary air supply system for adding air to the intake of an internal combustion engine under certain sensed conditions, such as an excessively rich air-fuel ratio detected by an oxygen sensor in the exhaust system, wherein two separate secondary air supply passages are provided and separately controlled by vacuum responsive valves. One of such valves is controlled to open and close over a period of time to provide a changing supply of secondary air while the other valve is connected through a solenoid operated valve to the engine intake to provide an immmediate opening or closing of that secondary air supply. Vacuum controls responsive to engine operating condition serve to operate the vacuum responsive valves although in one embodiment one of such valves is operated by a constant regulated vacuum.

Abstract: Deceleration control apparatus including a device for closing the throttle valve beyond its idling position during deceleration and a device for supplying secondary air to the intake passage downstream of the throttle valve at the same time. The air supply device includes an air supply opening directly in part of the diverged passages downstream of the first diverged portion of the intake manifold.

Abstract: A vacuum operated idle speed control device (26) for use on internal combustion engines to regulate the idle speed of the engine at the lowest operating speed. A controlled or sized input orifice (48) to the device (26) permits the basic valve body (38) to be used on different engine sizes. The diaphragm (42) modulates under control of an electromechanical vacuum control valve to provide the correct amount of pressure opening and closing the device (26). The vacuum operated idle speed control device (26) may include the vacuum control valve as an integral component.

Abstract: An apparatus and method for force feeding air to the carburetor of an internal engine. The apparatus includes a fitting for diverting a portion of the pressurized emission control air, the fitting positioned in the hose supplying pressurized air from an air pump of an emission control system to the exhaust system of a vehicle. The diverted air, after passing through an air filter, is introduced into the interior of the carburetor air filter housing radially inwardly from the air filter element within the housing. The pressurized air then flows through the carburetor to thereby enhance uniform distribution of the air-fuel mixture to the cylinders of the engine. Because the output of the air pump varies with the speed of the engine, higher pressure air is furnished at higher speeds of the engine. The furnished air can be pre-heated to further enhance vaporization of the fuel.

Abstract: An auxiliary air supplying apparatus for an internal combustion engine to bypass throttle valves in an intake passageway comprises an air box communicable with the intake passageway upstream of the throttle valves, a plurality of passageways branched in parallel from the air box and connected to the intake passageway downstream of the throttle valves and means for controlling the flow rate of the air which flows through the passageways in accordance with the load conditions of the engine.

Abstract: An air/fuel ratio control system for an internal combustion engine having an air induction system equipped with a secondary air passage communicated with an air intake passage and an oxygen sensor disposed in an exhaust system of the engine, the flow of the secondary air through the secondary air passage being controlled in accordance with a feedback control signal based on an output signal of the oxygen sensor, comprises a temperature sensor for sensing the temperature of the intake air supplied to the engine, and a control means for preventing the supply of the secondary air when the intake air temperature detected by the temperature sensor is below a predetermined level. The start timing of the feedback air/fuel ratio control is thus determined in accordance with the intake air temperature, to alleviate the drawbacks of the conventional air/fuel ratio control system in which the start timing of the feedback control is determined in accordance with the engine coolant temperature.

Abstract: Controlled amounts of relatively rich mixture and relatively lean mixture are supplied separately to a combustion chamber of an internal combustion engine. The position of the intake valves, exhaust valve and spark plug are such that the rich mixture tends to remain near the spark plug during the compression stroke of the engine and does not disperse throughout the lean mixture. At the time of ignition enriched mixture near the spark plug ignites readily and the flame propagates into and through the lean mixture which fills the remainder of the combustion chamber. Several constructions are disclosed to achieve the desired mixture ratios for various operating conditions of the engine.

Abstract: Intake air flow rate control means having a control valve and a stepping motor for driving the control valve is arranged in a passage other than a passage in which a throttle valve is disposed. In a fast idling control mode (when a coolant temperature is below 70.degree. C., for example) and a hot idling control mode (when the coolant temperature is above 70.degree. C., for example), the control valve is driven by the stepping motor to control an engine idling rotational speed. The numbers of steps of the stepping motor for given coolant temperatures, which are to be used in the fast idling control mode, are previously stored as tables ST1.about.ST3. A converted value ISTA of steps corresponding to a target rotational speed is calculated based on a predetermined conversion expression. An arithmetic operation is carried out such that the number of steps ISTEP, which was learnt in the previous hot idling control mode and stored in a permanently powered memory, is equal to the converted value ISTA.

Abstract: An exhaust gas suppressor which suppresses the generation of harmful gases contained in exhaust gases from internal combustion engines, wherein secondary air is efficiently heated to high temperature by a double-tubed heater installed downstream of the exhaust manifold of the internal combustion engine so as to connect to the internal combustion engine and is added to a mixture of primary air and fuel present in the suction manifold, the mixture being then fed to an eddy generating device, which generates eddies in the mixture for the complete gasification.

Abstract: Feedback control is carried out to maintain the rotational speed of an internal combustion engine during idling at a desirable speed determined according to the operating conditions of the engine by controlling an adjusting valve for controlling the amount of air to be fed to the engine. The actual rotational speed of the engine and the actual opening angle of the throttle valve are detected and when the actual rotational speed is lower than a predetermined value and at the same time the actual opening angle of the throttle valve is smaller than a predetermined value, the feedback control is carried out. Further, whether or not the driving power of the engine is operatively transmitted to the driving wheels is detected, and the predetermined value for the rotational speed of the engine is set at a higher value when the driving power is not transmitted to the driving wheels than when the driving power is transmitted to the driving wheels.

Abstract: An apparatus for controlling the atomization of fuel in an electronically fuel injection device for internal combustion engine, by jetting air or exhaust gas into the injection device so as to mix the air or the exhaust gas with the fuel thereby to atomize the fuel. The apparatus has a regulator adapted to maintain the pressure of the air or the exhaust gas at a level higher than the pressure in the main air passage by a predetermined pressure. The regulator has a housing in which a back pressure chamber and a control chamber are defined at both sides of a diaphragm accommodated by the housing. The back pressure chamber receives the air pressure transmitted from the downstream side of a throttle valve and accommodates a spring which urges the diaphragm toward the control chamber, while the control chamber receives the air from the upstream side of the throttle valve or the exhaust gas.

Abstract: A system for feedback control of the air-fuel ratio in a carburetor for an automotive internal combustion engine. The control system includes an auxiliary air bleed passage in the main air bleed of a fuel passage, an electromagnetic valve to periodically open and close the auxiliary air bleed passage, an exhaust sensor to detect a specific component of the exhaust gas as an indication of actual air-fuel ratio, and a control circuit to control the electromagnetic valve based on the output of the exhaust sensor. A vacuum passage connects the auxiliary air bleed passage at a section upstream of the electromagnetic valve to a venturi of the intake passage. A vacuum-responsive valve in the vacuum passage dilutes air admitted through the auxiliary air bleed passage with the venturi vacuum during higher speed operation of the engine to compensate for a tendency of the air through the auxiliary air bleed passage to be augmented.

Abstract: An air induction control device for an internal combustion engine is composed of an air passage for communicating upstream and downstream sides of a throttle valve in an intake passageway when opened, a valve member movably disposed in the air passage to open the air passage in response to pressure differential between the upstream and downstream sides of the throttle valve in the intake passageway, and a diaphragm member mechanically connectable to the valve member so as to open the air passage in response to vacuum prevailing in the intake passageway downstream of the throttle valve, thereby effectively controlling air induction to the engine, even when the throttle valve is closed during normal engine deceleration and at sudden engine deceleration or during operation of engine accessories at idle throttle state.

Abstract: There is described a method of and a fuel economizer device for reducing the fuel comsumption of an internal combustion engine. The device is in the form of a body having an outlet to the engine and a pair of inlets for admission of additional air. The inlets are controlled by pressure operated valves.

Abstract: An electronic control apparatus for an internal combustion engine monitors suction air concentration and an engine operation condition, and applies these values to a control circuit to produce output signals to control the air-fuel mixture to be supplied to the engine. The control circuit calculates a desired mass air flow rate based on at least one parameter representing an operating condition of the engine when the throttle valve is fully closed and controls the actual mass air flow rate bring it the desired mass air flow rate.

Abstract: An apparatus is proposed which serves to regulate the idling rpm of an internal combustion engine. To this end, a bypass valve is provided, which is disposed in a bypass around a throttle valve in the intake tube of the engine. A movable wall of the bypass valve separates a control chamber from a bypass chamber. The intake tube pressure downstream of the throttle valve in the bypass chamber prevails. The control chamber communicates via a control throttle restriction with atmospheric pressure and also, via an electromagnetically actuatable control valve which operates in accordance with operating characteristics of the engine, as well as with the intake tube pressure downstream of the throttle valve. The regulation of the idling rpm is thus effected by means of a proportional component effected by the bypass valve and an integral component effected by the pressure distribution between the control throttle restriction and the control valve.

Abstract: A low speed air bleed absorption reduction oil saving device for carburetor characterized in the ability to turn air valve to open automatically in circumstances where the automobile concerned is reducing its speed, going downhill or the carburetor is experiencing a momentous absorption internally such that the rotation speed of the engine remains above 950 RPM, equivalent to a speed in motion that is higher than 25 Kms per hour as executed by the high-speed gear, so as to enable the air to enter the cylinder via the air filter so as to hold down the vacuum absorption so as to prevent overfilling of gasoline into the cylinder thereby achieving the objective of saving of use of gasoline fuels.

Abstract: An air/fuel ratio control system for performing feedback control of the air/fuel ratio of an air/fuel mixture being supplied to an internal combustion engine in response to the concentration of an exhaust gas ingredient. The air/fuel ratio control system includes a device for controlling a shot air valve for supplying secondary air into the intake pipe of the engine. The control device is connected to a solenoid valve for controlling the shot air valve and operable to open the solenoid valve to hold the shot air valve inoperative for a predetermined period of time after the engine rpm has increased across a predetermined value which is higher than the engine cranking rpm but lower than the engine idling rpm, to thereby prevent misfire within engine cylinders at the start of the engine.

Abstract: A device for correcting the combustion of internal combustion engines, in particular automobile engines, the internal combustion engine having an intake manifold, the device including a first sealed chamber directly connected to the intake manifold, a second sealed chamber separated from the first chamber by a diaphragm having a neutral position, the second chamber being connected to the first chamber through a passage for delaying transmission of pressure variations from the first chamber to the second chamber, a control device for reducing the fuel to air ratio of the air and fuel mixture, the control device being coupled to the diaphragm for activation by the diaphragm whenever the differential pressure between the first and second chambers exceed a first predetermined value and whenever the differential pressure exceeds a second predetermined value.

Abstract: A control system for a mixture-compressing internal combustion engine with a throttle flap valve disposed in an intake manifold and an idle channel bypassing the throttle flap valve. An additional channel, terminating downstream of the idle channel in the intake manifold, with the additional channel merely forming an air channel. A valve is provided for controlling a communication between the additional channel and the intake manifold. The valve is connected with a diaphragm a back surface of which is adapted to be exposed to the intake manifold vacuum through a line connected to the intake manifold. A three/two-way on-off valve, influenced by a control device, is disposed in the line connected to the intake manifold. The on-off valve is adapted to vent the backside of the diaphragm when the intake manifold vacuum is above an idle value during a coasting of the engine so as to enable air to be introduced into the intake manifold through the additional channel.

Abstract: A fuel injection apparatus for externally ignited internal combustion gas engines is proposed. The fuel injection apparatus comprises an intake pipe in which an air flow meter and a throttle valve are provided. The fuel quantity injected into the intake pipe via an injection valve is controlled by the air flow meter. To prepare the combustible mixture of injected fuel and air, a preparation air line branches off from the intake pipe between the air flow meter and the throttle valve. This preparation air line discharges into the injection valve. A throttle is provided in the preparation air line. A full-load air line discharges into the preparation air line between the throttle and injection valve. A shut-off valve is provided in the full-load air line, said shut-off valve being completely open at least during the full-load operation of the combustion engine, allowing additional air flow into the preparation air line, which air is drawn from the intake pipe upstream of the air flow meter.

Abstract: An apparatus for use in conjunction with a conventionally carbureted internal combustion engine for improving fuel economy, which is connected to the carburetor float chamber and intake manifold of the engine and automatically lowers the fuel/air ratio during idle and other low-load engine operation by simultaneously reducing the pressure in the float chamber and allowing air to flow into the intake manifold.

Abstract: A carburetor air injection system comprising a downdraft carburetor which includes a butterfly type automatic choke valve, a butterfly type throttle valve spaced from said automatic choke valve, an idler jet in the carburetor on the opposite side of the throttle valve from the automatic choke valve, and a fuel jet between the automatic choke valve and the throttle valve. An air injector plate is positioned between the carburetor and the intake manifold. The air injection plate includes capillary air orifices feeding constantly controlled quantities of air into the air-fuel mixture passing from the carburetor to the intake manifold during operation of the engine. A flexible tubing having an air filter removably associated therewith is connected to the air injector plate.

Abstract: Apparatus for receiving crankcase emissions from an internal combustion engine and for separating the liquid and solid portions of the emissions from the gaseous portion thereof. The apparatus includes a container or vessel having an open top which is closed by a cap. The cap has an inlet port for receiving crankcase emissions, an outlet port for permitting the separated gaseous portion of the emissions to be directed through a PVC valve to the intake manifold of the engine, and an air inlet port for allowing ambient air to mix with the crankcase emissions as they are directed toward the interior of the container. The cap carries a porous body which separates the incoming crankcase emissions flowing between the inlet port and outlet port into the liquid, solid and gaseous portions, the liquid and solid portions being trapped in the container while the gaseous portion is permitted to flow toward the outlet port for exit from the container.

Abstract: In an exhaust gas cleaning system for an internal combustion engine in which additional air is injected from outside into an engine exhaust manifold by an on-off-duty solenoid valve under control of a microcomputer operating on the partial oxygen pressure in the exhaust gas as detected by an oxygen sensing element, the engine r.p.m. and the exhaust gas temperature, a vacuum control valve adapted to add vacuum signals responsive to variations in the intake manifold vacuum of the engine and throttle opening to the output vacuum signals of the solenoid valve commanding the air injection.

Abstract: A flow control valve for mounting on the intake manifold of an internal combustion engine for controlling a by-pass passage supplying air to the intake manifold of the engine by operating a solenoid in response to output signals from an O.sub.2 sensor located in the exhaust manifold. A casing which is mounted on the intake manifold to form the by-pass passage is interiorly provided with a movable member which is operated by energization and de-energization of the solenoid and biased to abut against a fixed member in the casing by the action of a first spring when the solenoid is in the de-energized state. Further provided in the casing are a slide member which is slidable along the fixed member and a pressure chamber defined by the diaphragm one peripheral edge of which is secured to the slide member, the pressure chamber being communicated with the intake manifold to receive the intake manifold vacuum therein.

Abstract: A combination of an air cleaner for cleaning intake air to be inhaled by an internal combustion engine and a deceleration compensating air control valve for controlling supply of secondary air to the intake manifold of the engine during engine deceleration, wherein the deceleration compensating air control valve is mounted in the clean air space provided in the air cleaner casing at the inner side of an annular filtering element mounted in the air cleaner casing, or is mounted at the outside of the air cleaner casing, so that, in both cases, the air inlet port of the deceleration compensating air control valve is directly open to the clean air space.

Abstract: A fuel-saving and emission reduction system for internal combustion engines includes electronic carburetor controlling circuitry and a carburetor by-pass system which stops fuel flow to the engine when power from combustion is not required. A normally open by-pass control butterfly valve in the fuel/air passage between the throttle valve and the engine intake manifold is operated by a motor, such as a solenoid or the like, under control of the controlling circuitry and is closed only upon release of the engine throttle and during the period that the vehicle has sufficient speed to assure restart upon reapplication of the fuel/air flow. A carburetor by-pass valve is held in a normally closed position by the combined effects of spring bias and the normal vacuum in the fuel/air passage.

Abstract: An intake air flow rate control method system for an internal combustion engine includes a valve which is provided with an electromagnetically operated actuator responsive to a control signal. The control system identifies a control signal for controlling actuation of the actuator and thereby for controlling the air flow rate generating the control signal indicative of the control. The display selectively carries out closed loop (feedback) control and open loop control corresponding to engine driving conditions. Feedback control is carried out when the engine driving condition is stable (in steady state). To determine a suitable condition control for closed loop, a throttle valve closed position, a transmission neutral, and a vehicle speed are checked. When the throttle valve is closed and the transmission is in neutral, the vehicle speed is less than 8 km/h and/or the fuel supply occurs shut off, a decision to carry out feedback (closed loop) control is made.

Abstract: An exhaust gas suppressor which suppresses the generation of harmful gases contained in exhaust gases from internal combustion engines, wherein secondary air is efficiently heated to high temperature by a coiled heater tube installed in the exhaust manifold of the internal combustion engine and is added to a mixture of primary air and fuel present in the suction manifold, the mixture being then fed to an eddy generating device which generates eddies in the mixture for complete gasification.

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 fluid control system for cleaning exhaust gases of an internal combustion engine by injecting additional air into the exhaust manifold of the downstream of the combustion chamber of the engine according to the engine operating conditions. This system includes a vacuum control valve which supplies vacuum on-off signals to a flow control valve device which meters injecting of additional air.

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: A secondary air feeder for an internal combustion engine, including a vortex chamber provided between a carburetor and a suction pipe. The air supply to the vortex chamber is regulated by an air supply regulator, in which a valve is opened and closed in accordance with the engine speed.

Abstract: Devices are shown and described for attachment to an engine's intake manifold to regulate its vacuum for fuel economy. The device maintains smooth engine operation by employing multiple valves, each of which provides a supplemental flow of air to the intake manifold during a particular engine mode. Thus, during an idle mode one individually settable valve is operative to supply additional air to the intake manifold to maintain its vacuum at a precisely selected level referenced to an engine idle mode while during deceleration, when a high volume of air is needed, a supplemental flow of air is admitted from another valve which opens at a higher vacuum level from the first valve. A third valve is employed to admit supplemental air during acceleration when the other two valves are closed for an improved fuel to air mixture. Several embodiments are shown.

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: 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: An air valve for a fuel supply system of an internal combustion engine is proposed, which assures good start-up of the engine and furnishes a fuel-air mixture required for combustion during overrunning. The air valve includes a housing, which is separated by a diaphragm into a first chamber and a second chamber. The first chamber communicates with the intake tube section dowstream of a throttle valve and the second chamber comunicates first with the intake tube upstream of the throttle valve and second with the intake tube downstream of the throttle valve. A valve plate guided by the diaphragm engages a valve seat sheath which is slidably supported in a mouthpiece. A flow cross section is formed between the valve seat sheath and the mouthpiece. Immediately following starting, additional air can bypass the throttle valve for the purpose of improved starting up of the engine.

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 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.