Abstract: An induction system for an internal combustion engine that improves performance, particularly at low speeds, through the use of a relatively small auxiliary induction system, through which a substantial portion of the low speed charge requirements of the engine are supplied. In accordance with this invention, a cold starting enrichment device in the form of a fuel injection nozzle is provided in a main passage of the auxiliary induction system. In accordance with one feature, a throttle valve is provided in an induction passage and has a smaller cross-sectional area than the passage in its idle position, so as to permit the idle air flow around the periphery of the throttle valve. In accordance with another feature, a temperature responsive air by-pass is provided for flowing additional air into the auxiliary induction passage during cold running, so as to improve warm-up time.

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: 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 idling speed control device of an internal combustion engine comprising a bypass passage which interconnects the intake passage located upstream of the throttle valve to the intake passage located downstream of the throttle valve. A flow control valve is arranged in the bypass passage and actuated by a step motor for controlling the amount of air flowing within the bypass passage to maintain the idling speed of an engine at a predetermined speed. The step motor comprises a screw threaded valve shaft and a rotor rotatably mounted on the valve shaft and having a screw threaded center hole which is in engagement with the screw threads of the valve shaft. A pair of stop pins, each being engageable with the corresponding end face of the rotor, is fixed onto the valve shaft.

Abstract: In a method and an apparatus for optimum control of an internal combustion engine, an air-fuel ratio is dithered by a dither amount from a basic air-fuel ratio and the engine is operated with the dithered air-fuel ratio. A resultant change of the output state of the engine is detected, and the direction of improving fuel consumption is decided by the change of the output state of the engine so that the basic air-fuel ratio is changed in that direction. Either the dither period during which the engine is operated with different selected air-fuel ratios or the dither amount is determined with elevated precision by a signal detected in association with the output state of the engine.

Abstract: An idling rpm control method for feedback control of a control valve for controlling the quantity of supplementary air being supplied to the engine in response to a difference between actual engine idling rpm and desired idling rpm. At the start of the engine, the control valve is continuously opened for a predetermined period of time from the time the engine rpm has increased above a predetermined value lower than the desired idling rpm, thereby maintaining the engine rpm at a value higher than the above desired idling rpm. The above predetermined period of time may desirably be set to a value as a function of engine temperature, preferably detected immediately after the engine rpm has exceeded the above predetermined value of engine rpm.

Abstract: A regulating device is proposed for an internal combustion engine having a throttle device and a controllable bypass channel in the intake tube, where regulation is effected to a minimum volume (Q/n) in overrunning above a predetermined rpm value and to the idling rpm below this rpm value. The purpose of this regulating device is the substantially precise preliminary control of an adjustment member in the bypass channel around the throttle valve to the opening cross section required for idling. The regulating device includes a switchover device (alternating switch), to the input terminals of which the output signals of the regulators for volumetric value and for idling rpm are applied. In the case of temperature-dependent minimum and threshold volumetric values, good warmup performance can be attained.

Abstract: A device for the control of at least one throttle diameter in a control line, especially in a line carrying fuel for an internal combustion engine, is proposed. The device includes at least one circle segment-like control section in a control bore intersecting the control line, the section pivotable around an axle and opening to a larger or lesser degree the throttle diameter formed by the intersection. The control bore has a circularly arched sealing surface surrounding the throttle diameter extending eccentrically to the axle and with which the control section, also disposed eccentrically to the axle and disposed pivotably, works together in such a way, that the radial distance between the circumference of the control section and the sealing surface is nearly zero when the control section is in a closed position, and increases during a pivotal movement in the direction of opening the throttle diameter.

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 engine has a main intake passage having a throttle valve therein. A bypass passage is branched off from the main intake passage located upstream of the throttle valve and is connected to the main intake passage located downstream of the throttle valve. A flow control valve, actuated by a stepper motor, is arranged in the bypass passage. The step position of the stepper motor is so controlled that the idling speed becomes equal to a desired speed. When an engine stall takes place and, then, the engine is started again, the step motor is rotated by five steps in a rotating direction wherein the flow area of the flow control valve is increased.

Abstract: An idling speed control device of an internal combustion engine comprising a bypass passage which interconnects the intake passage located upstream of the throttle valve to a surge tank which is arranged in the bypass passage located downstream of the throttle valve. A flow control valve is fixed onto the surge tank and actuated by a step motor for controlling the amount of air flowing within the bypass passage to maintain the idling speed of an engine at a predetermined speed.

Abstract: The sectional area of a bypass passage which is bypassing a throttle valve in an intake passage of an internal combustion engine is determined to a specific value during starting. The specific value is obtained by adding an increment value to a base value which corresponds to an optimum value of the sectional area in the stable idling condition.

Abstract: An idling speed control device of an internal combustion engine comprising a bypass passage which interconnects the intake passage located upstream of the throttle valve to the intake passage located downstream of the throttle valve. A flow control valve is arranged in the bypass passage and actuated by a step motor for controlling the amount of air flowing within the bypass passage to maintain the idling speed of an engine at a predetermined speed. The step motor comprises a screw threaded valve shaft and a rotor rotatably mounted on the valve shaft and having a screw threaded center hole which is in engagement with the screw threads of the valve shaft. The valve shaft is supported by bearings so that the valve shaft cannot be rotated, but is able to move in the axial direction.

Abstract: An adjustment device having a servomotor and arranged for rotary angle adjustment is proposed. The rotary portion is connected via a shaft with a throttle device which controls the cross section of a bypass line bypassing a throttle valve disposed in the intake tube of an internal combustion engine. The adjustment device is axially limited on one end by a cap, which is embodied as a cast part together with a portion of the bypass line. The throttle device is embodied as a rotary slide and with a control portion transversely penetrates the cap and the bypass with the control portion arranged to open the bypass to a greater or lesser extent depending on the position of the rotary slide. Between an armature of the servomotor and the rotary slide, a sealing disc is loosely guided on the shaft. As a result of a pressure drop at the sealing disc, the sealing disc can be pressed against a sealing face of the cap in order to keep the leakage air quantity as small as possible.

Abstract: An idling speed control device of an internal combustion engine having a bypass passage which interconnects the intake passage located upstream of the throttle valve to the intake passage located downstream of the throttle valve has a flow control valve device arranged in the bypass passage and actuated by a stepper motor for controlling the amount of air flowing within the bypass passage to maintain the idling speed of the engine at a predetermined speed. The flow control valve device comprises a valve chamber having an air inlet opening and an air outlet opening which is connected to the intake passage located downstream of the throttle valve. The air inlet opening is formed on the inner bottom wall of the valve chamber and connected via the bypass passage to the intake passage located upstream of the throttle valve.

Abstract: An internal combustion engine provided with an idling adjusting device including a by-pass air passage which by-passes a throttle valve in a main air passage. The engine is further provided with an auxiliary air introducing device which increases the cross-sectional area of the by-pass air passage as engine temperature and/or ambient air temperature are above respectively predetermined temperatures during starting operation of the engine.

Abstract: An air control device regulates the amount of air flowing through an air passage bypassing a throttle valve place in an induction passage leading to an engine for an automotive vehicle so that the air flow can increase during warming up of the engine. A shutter mechanism for regulating the effective area for the air flow through the air passage is cylindrical, for example, including an inner cylindrical body and an outer cylindrical body which are rotatable to each other.

Abstract: A fast idle device for a carburetor is disclosed such that an optimum throttle valve opening (idle opening) is calculated through a calculating circuit based on various engine operating conditions, after the engine is started, and is controlled repeatedly, until the engine is fully warmed up, in such a way that the throttle valve movement urged by a return spring in the direction to close the valve is released steppedly by a ratchet mechanism. The fast idle device of the present invention comprises various sensors, a calculating circuit, and an electromagnetic ratchet mechanism, in addition to a conventional throttle valve.

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: An arrangement to eliminate the disadvantage of explosions caused by intake line backfiring resulting under cold engine starting conditions of internal combustion engines equipped with fuel injection systems of the type that inject, under cold starting conditions, additional fuel in finely divided form into the manifold intake pipe. In an improved fuel injection system, a fuel distribution arrangement comprising a fuel admitting portion communicating with an injection nozzle, and fuel feed components each of which extends from the admitting portion to a corresponding one of a plurality of intake lines to the engine is provided in the manifold intake pipe.

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 temperature responsive, pressure operated diaphragm valve assembly for use in association with an automobile internal combustion engine comprises a valve housing having a working chamber on one side of a diaphragm member, a biasing spring used to urge the diaphragm member in one direction with a valving element held in position to close a fluid passage, one end of the fluid passage being communicated to the fuel intake system of the engine and the other end thereof communicated to a source of fluid medium, and a temperature sensor having a parameter, the magnitude of which is variable according to the magnitude of the ambient temperature. The temperature sensor also has a push rod axially movable in response to change in magnitude of the parameter, the movement of the push rod being in turn transmitted to the biasing spring to adjust the biasing force exerted thereby on the diaphragm member.

Abstract: There is disclosed a fuel feeding device for an internal combustion engine equipped with an air regulator for feeding air through a bypass around a throttle valve and a fuel jetting valve for feeding fuel. An air passage outlet of said air regulator is open opposite to and facing said fuel jetting valve. The opening degree of said air regulator is controlled by a coil bimetal functioning in proportion to the temperature of the engine or through a step motor being driven through a controlling circuit detecting operation conditions of the engine.

Abstract: In an internal combustion engine having an air intake passage containing a throttle valve, and provided with passages to the outside from points upstream and downstream of the throttle valve, an auxiliary air regulator comprising a mounting block within which is formed a bypass passage, one end of which is matably connected with a passage in said air intake passage upstream of the throttle valve, and the other end of which is matably connected with a passage in said air intake passage downstream of the throttle valve. A movable shutter means is disposed within said bypass passage so as to control the effective cross-sectional area of said bypass passage. A bimetallic coil is enclosed within an air tight chamber annd being selectively heated. Engaging means connects the outer end of said bimetallic coil with said shutter means so that a movement of the bimetallic coil in response to a temperature change is transmitted mechanically to the shutter means.

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: An electrically controlled fuel injection apparatus is proposed which serves to control an internal combustion engine.

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 four cylinder spark ignition internal combustion engine has an exhaust emission control system including means for admitting fresh air into the exhaust system in order to promote a further combustion of partly burnt components in the gases coming from the combustion chambers, this means include a "reed" valve connected to the exhaust ports leading from the first and fourth cylinders (numbering from one end of the engine) through internal passages within the cylinder head; the system also comprises an exhaust gas recirculating system comprising a pneumatic valve which opens, when the conditions are appropriate, to draw off a proportion of the exhaust gases from the exhaust side of the engine and admit them to the induction side of the engine taking exhaust gases from branches of the exhaust manifold carrying exhaust gases from the second and third cylinders; in addition there is a system for admitting supplementary air to the induction manifold downstream of the carburettor during engine overrun conditions e

Abstract: An air filter for filtering combustion air for an internal combustion engine includes a housing holding a filter element and an inlet snorkel tube connected to the housing. A "trap door" valve mechanism is located in the snorkel tube and includes a valve seat mounted on a support which circumscribes the inner wall of the snorkel tube and a valve element pivotally mounted on the support which is yieldably urged into sealing engagement with the valve seat when the engine is turned off. The valve mechanism presents a surface substantially transverse to the direction of air flow through the snorkel tube, so that combustion air communicated through the snorkel tube when the engine is running acts against the transverse surface urging the valve element to an opened position. The valve element is "cracked open" by a solenoid when the engine is to be started in order to permit initial air flow through the air cleaner to facilitate starting.

Abstract: An exhaust emission control system for a spark ignition internal combustion engine comprises a first pressure sensitive valve for recycling a proportion of the exhaust gases from the exhaust to the induction when the engine is warm, being inhibited when the engine is cold, valves for admitting a small amount of fresh air to the exhaust manifold, a second pressure sensitive valve for admitting fresh air to the induction manifold downstream of the carburettor when the engine is warm, being closed when the engine is cold and when the starter motor is energized, a first fuel/air mixture enrichment valve in the carburettor sensitive to induction manifold pressure and de-sensitized when the engine is cold, a second fuel/air mixture enrichment valve sensitive to induction manifold pressure and de-sensitized when the engine is hot, and a vacuum advance delay which is by-passed when the engine is warm.

Abstract: A spark ignition internal combustion engine having an exhaust emission control system including an air pump driven by the engine to pump fresh air directly into the exhaust duct in order to promote a further combustion of partly burnt components in the gases coming from the combustion chambers, excess air pressure being released by a pressure relief valve into an air filter for the induction air; the system also comprises an exhaust gas recirculating system comprising a pneumatic valve which opens, when the conditions are appropriate, to draw off a proportion of the exhaust gases from the exhaust side of the engine and admit them to the induction side of the engine; in addition there is a system for admitting supplementary air to the induction manifold downstream of the carburettor during engine overrun conditions except when the engine is cold, and the carburettor is provided with supplementary pumps and valves which only function when the engine is cold, being inhibited as the engine approaches its normal w

Abstract: An idling control apparatus for an internal combustion engine includes a valve element amounted in a passage for air for idle running of the engine bypassing a throttle valve mounted in a suction conduit for communicating a portion of the suction conduit upstream of the throttle valve with a portion thereof downstream of the throttle valve, and a bimetal member in the form of a spiral operatively connected to the valve element for varying the quantity of air flowing through the passage for air for idle running of the engine in accordance with changes in the temperature of the engine.

Abstract: A temperature responsive valve device including a body having first, second and third ports, a first passage member disposed between the first and second ports, a second passage member disposed between the second and third ports, a member defining an orifice arranged within the first passage member for delaying transmission of fluid therethrough, a first filter member arranged between the orifice member and the first port and within the first passage member, a second filter member arranged within the first and second passage members and between the orifice member and the second port as well as between the second and third ports, a passage defining member having an annular portion which contacts with the second filter member to thereby allow fluid communication between an inner portion of the annular portion with the first port and communication of an outer portion of the annular portion with the third port only through means of the second filter member, and a temperature responsive valve member for interrupti