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 through a multi-stage fuel metering valve assembly and such metered fuel is supplied as to the induction passage means; the multi-stage metering valve assembly is shown as having a valve member with a step-like surface reciprocatingly cooperating with a metering orifice of fixed effective flow area so that during a first range of metered fuel flow a first portion of the step-like surface is effective for cooperating with the metering orifice in determining the rate of metered fuel flow while during a second range of metered fuel flow a second portion of the step-like surface is effective for cooperating with the metering orifice in determining the rate of metered fuel flow.

Abstract: An idling rpm feedback control method for controlling control means that controls the quantity of supplementary air being supplied to an internal combustion engine in a feedback manner, in response to the difference between actual engine rpm and desired idling rpm at engine idling, when all predetermined engine operating parameters at least including the throttle valve opening show values satisfying a predetermined condition. When the throttle valve opening detecting means malfunctions, control is effected by maximizing the quantity of supplementary air to the engine by operating the above supplementary air quantity control means to its operating limit.

Abstract: A stepping motor is driven such that a rotational speed of an engine falls within a range of a target rotational speed determined in accordance with at least an engine coolant temperature when a throttle valve is substantially fully closed, in order to control an opening area of an air flow rate control valve. In the control operation, a lower limit of the opening area of the control valve is set to prevent the opening area from being reduced beyond a predetermined area in order to prevent engine stall. A predetermined setting is stored in a predetermined area each time when a vehicle speed signal from a vehicle speed sensor is received and the predetermined setting is decremented under a predetermined condition. When the decremented setting reaches zero, a current lower limit is maintained.

Abstract: A device for aiding in the control of the fuel-air mixture in an internal combustion engine having an accelerator linked mechanically to a carburetor and a ventilation passage from the crankcase of said engine to the intake manifold, said device comprising a valve housing having a seat coupled to an air passage adapted to communicate between outside ambient air and the ventilation passage; a valve means for seating in the seat in the valve housing to prevent ambient air from flowing into the air passage, and a rotatable valve control cam means coupled to the accelerator to gradually open and close the valve as the accelerator is depressed. This device is used to increase the air in the fuel mixture so as to provide a more complete combustion.

Abstract: An air-fuel ratio control system for an internal combustion engine having an emission control system with a three-way catalytic converter for controlling the air-fuel ratio in accordance with the operation of the engine. A throttle sensor for detecting a wide-open throttle operation of the engine and a predetermined voltage supply circuit are provided. A feedback control circuit is provided for controlling the air-fuel ratio to the stoichiometric air-fuel ratio in a normal operating condition. A memorizer circuit memorizes a value corresponding to the control output of the feedback control circuit. A first switch means is actuated by the output of the throttle senor to connect the output of the predetermined voltage supply circuit with the input of the feedback control circuit when acceleration is detected, and to cut off the input of the memorizer circuit for maintaining the stored content thereof.

Abstract: A device for atomizing the fuel for an internal-combustion engine comprising a fuel pump, an electromagnetic fuel-injection valve connected to said fuel pump, an air-injection port adjoining the injection port of said electromagnetic fuel-injection valve, an electromagnetic air flow-controlling valve connected to said air-injection port, and an air pump for feeding air to said air flow-controlling valve, wherein said air flow-controlling valve is controlled in such a manner that the injection of air from said air-injection port takes place simultaneously with the injection of fuel from said fuel-injection valve, whereby the air pump and the driving circuit thereof are of a comparatively small size and the amount of power necessary for driving the air pump is of comparatively small.

Abstract: A gasoline engine air valve fuel saver device, characterized in the ability to have the air valve opened automatically in circumstances where the vehicle concerned is reducing its speed, going downhill or the suction from within the carburetor is great while the engine rotation speed remains higher than 920 RPM (equivalent to the speed of 25 Kms per hour as effected by the high-speed gear shifting), so that the air may bypass the carburetor at it passes from the air filter to the intake manifold to reach the cylinders, so as to reduce the vacuum in the intake manifold and so reduce the quantity of gasoline that will enter the cylinders, to achieve a saving of fuel consumption and abatement of air pollution as well.

Abstract: A system for controlling the vehicle speed of travel as well as for regulating the idling speed of automotive vehicles having an Otto engine, comprising an actuator which adjusts the position of a regulating element for control of the vehicle speed as a function of the position of a desired-value transmitter. A closure element, as well, which determines the through-put passage cross section of a by-pass, the latter connecting a region in front of the regulating element with a region behind the regulating element, the closure element being displaceable by an automatically controlled actuator. The first-mentioned actuator and the automatically controlled actuator constitute a single actuator means common both for controlling the vehicle speed of travel and for regulating the idling speed. The single actuator actuates the closure element for regulating the idling speed, in a first operating range and operates the regulating member for controlling the vehicle speed of travel in a second operating range.

Abstract: A fuel metering apparatus is shown as having a throttle body with an induction passage therethrough and a throttle valve for controlling flow through the induction passage, a fuel-air mixture discharge member is situated generally in the induction passage downstream of the throttle valve, an air passage communicates between a source of air and the fuel-air mixture discharge member, the air passage also includes a flow restrictor therein which provides for sonic flow therethrough, and a fuel metering valving assembly is effective for metering liquid fuel at a superatmospheric pressure and delivering such metered liquid fuel into the air passage upstream of the flow restrictor thereby causing the thusly metered liquid fuel and air to pass through the sonic flow restrictor before being discharged into the induction passage by the fuel-air mixture discharge member, the fuel-air mixture discharge member has a plurality of discharge ports spaced from each other and directed generally radially inwardly of the induct

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 engine includes a main intake passage having a throttle valve therein. A bypass passage branches off from the main intake passage upstream of the throttle valve and connects again to the main intake passage downstream of the throttle valve. A flow control valve, actuated by a step motor, is arranged in the bypass passage. When the speed difference between the desired idling speed and the actual idling speed is higher than 20 r.p.m., the step motor is rotated in a direction wherein the actual idling speed approaches the desired speed. Contrary to this, when the above-mentioned speed difference is lower than 20 r.p.m., the step motor remains stationary.

Abstract: An internal combustion engine having first valve means disposed in the exhaust system and adapted to impart a resistance to the flow of exhaust gas to control the flow rate of the latter, and second valve means provided in the intake passage of said engine and adapted to introduce fresh air to the intake passage when r.p.m. of the engine has reached a predetermined value. During operation of the engine, a part of the exhaust gas is made to return into the combustion chamber due to the resistance imparted by the first valve means, and the unburned hydrocarbons in the exhaust gas returned to the combustion chamber are efficiently burned by the presence of fresh air which is introduced through the second valve means. Thus an improved internal combustion engine which can operate at a much improved fuel economy and which can minimize the emission of unburned hydrocarbons to the atmosphere is obtained.

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: 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 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 supplied to a fuel discharge nozzle situated within the induction passage means downstream of the throttle valve, air 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: In a device for introducing additional air into an air-fuel mixture flowing through an intake passage to combustion chambers of an internal combustion engine, means is provided for maintaining the pressure of the additional air or gas introduced into the intake passage from the periphery thereof to more than twice as high as the internal pressure in the intake passage.

Abstract: Apparatus for controlling introduction of gas into a passage of an internal combustion engine employs a first control valve in a gas introduction passageway, a second control valve in an air conduit connecting the intake passage to atmosphere, and a regulating valve responsive to vacuum intensity in the intake passage. The regulating valve actuates vacuum responsive actuators for the control valves. This system is used for recirculating exhaust gases into the intake passage, for introducing supplementary atmospheric air into the intake passage to modifying the air-fuel ratio in accordance with atmospheric pressure reduction at high altitudes, and for controlling the introduction of atmospheric air into the exhaust passage upstream from a catalytic converter or reactor.

Abstract: In combination with an internal combustion engine having a throttle valve disposed in an intake manifold, an evaporative emission control device for controlling the emission to the atmosphere of fuel vapors from an internal combustion engine fuel system which comprises an air cleaner housing having a primary air intake conduit, a gating valve operatively disposed in the primary air intake conduit for selectively opening and closing the primary air intake conduit, a diaphragm valve assembly for bringing the gating valve means in position to open the primary air intake duct when a negative pressure developed in the intake manifold is induced in a working chamber, a fluid passage extending between the working chamber and the intake manifold, and a delay unit operable, when the negative pressure in the intake manifold decreases, for delaying a corresponding decrease of the once-induced negative pressure in the working chamber for a predetermined time to maintain the gating valve in the opened position.