Abstract: A device for governing the idling rpm of an internal combustion engine which has a counterbalanced distribution which prevents vibration of a control. In addition, measures are taken by which a pressure of the operating fluid acting on the device can be equalized. An induction core is fixedly attach to a regulator housing to form an axle journal on the induction core. An annular armature is connected to the regulating element, which is seated on the axle journal to be axially displaceable. An elastic diaphragm defined an equalization chamber, which communicates with a connecting line via a line connection. The device is suited in particular for governing the idling rpm of a mixture-compressing internal combustion engine by means of controlling the quantity of intake air flowing in a flow line to the engine.

Abstract: When or just after an engine (1) is started, a starting switch (9) is turned on and a value is set in a just-after-starting counter in a CPU (114). The starting or just-after-starting state is detected. Fuel temperature and fuel properties are detected by a fuel properties sensor (16). The detected values are calculated in the CPU (114). Fuel temperature detection output is corrected, then a filter value or average value is calculated and stored in RAM (114b) in the CPU (114) and just after the engine is started, based on the stored value, driving of a bypass control valve (6) and an injector (12) is controlled and the fuel amount or air amount is controlled for the engine. Thereby, it is enable optimum fuel amount control when and just after an engine is started regardless of the differences in the fuel properties.

Abstract: In a state in which the engine is unloaded and the number of engine rotation is low, an overlap period of time during which the intake valve and the exhaust valve are both open is extended during the cold time, as compared with during the warm time. The extension of the overlap period of time causes gases remaining in the cylinders to increase, thereby making the burning of the fuel slow and elevating the temperature of the exhaust gases to thereby elevate the temperature of the cylinder head of the engine. A variation in the number of engine rotation, particularly a decrease in the number of engine rotation, resulting from the increase in the residual gases can be prevented by increasing the amount of intake air. Further, the temperature of the cylinder head can be elevated due to an increase in the amount of the supplied fuel resulting from the increase in the amount of the intake air.

Abstract: Disclosed herein is an emission control device for use with a carburetor or fuel injection engine. The device is comprised of a body member of predetermined thickness and may define therein at least one through opening. The through opening communicates with the fuel opening in the carburetor or the fuel injection body. The device also has an air passageway largely defined in its surface. The air passageway communicates with the through opening and lies generally under the fuel passageways of the carburetor or injection body so that air passed through the passageway passes into the through opening and under the fuel passageways.

Abstract: An engine control apparatus and method can prevent engine stall in a reliable manner when the engine is changed from a high-speed loaded operation into an idling operation. An air/fuel mixture is supplied to engine cylinders 16 through an intake passage 1 with a throttle valve 6 disposed therein, and a bypass passage 10 with an air valve 12 disposed therein is connected with the intake passage 1 for bypassing the throttle valve 6 to supply auxiliary air to the cylinders. Based on an operating condition signal D in the form of an idle switch on/off signal, an electronic control unit (ECU) 30A detects a change from a loaded operation into an idling operation of the engine, and determines, based on a speed signal R from a speed sensor, whether the number of revolutions per minute of the engine R is equal to or less than a predetermined reference value Rk.

Abstract: A fuel metering and injection system is shown having air nozzles communicating with a source of air and effective for directing a flow of air as to impinge upon the flow of fuel as has been metered and injected into the induction system of an associated engine.

Abstract: An idling speed control system is provided in an internal combustion engine which has an intake passage led to cylinders of the engine, a throttle valve installed in the intake passage, a bypass passage bypassing the throttle valve and an air-flow controller installed in the bypass passage for controlling the amount of air flowing in the bypass passage. The system comprises a first device which detects an engine torque which causes a fluctuation of rotation speed of the engine; and a second device which controls the air-flow controller in accordance with the detected engine torque.

Abstract: An internal combustion engine air supply system having a first air intake passage (11) through which air can flow to the engine (8) with a driver actuated mechanism operatively coupled to a first control means (12) to vary the air flow through the primary passage (11) to the engine (8) in response to the driver demand and a second air intake passage (13) through which air can flow to the engine (8) with an actuator means operable in response to sensed engine operating conditions to operate a second control means (5) to vary the air flow through the second passage (13) to the engine (8); the first control (12) means and second control means (5) being operable independently, so that the air supplied to the engine (8) may pass solely through one of the first (11) or second (13) air passages or simultaneously through both.

Abstract: An automatic control system is shown to vary the mixture of fuel-to-air in a conventional internal combustion engine to minimize resulting pollutants and maximize engine efficiency and performance. The system senses manifold vacuum and engine acceleration and based, in part, upon such inputs forces the mixture leaner until an instability event is detected at which time the system rapidly forces the mixture richer at a predetermined rate and time period to overcome the instability. The mixture is then again forced leaner. The rate of leaning is controlled by the vacuum pressure so that no leaning occurs at or near full throttle and the rate of leaning is decreased as power requirements decrease Further, secondary air is introduced substantially tangentially to the primary air/fuel flow to maximize mixture between the primary and secondary flows.

Abstract: An air induction control device for an internal combustion engine comprises means defining a communication passageway for communicating between air at atmospheric pressure and the air in the downstream passageway from a throttle valve. A valve member is disposed in the communication passageway and is moveable toward the downstream direction thereof to open the communication passageway in response to an atmospheric pressure greater than pressure in the downstream passageway. A valve biasing means is disposed to apply force to and bias the valve member in the upstream direction to close the communication passageway in response to the pressure differential between atmospheric pressure and the air pressure int he downstream passageway. A flow restriction element positioned downstream of the valve member comprises calibrated openings defining a primary chamber and secondary chamber, wherein the volumetric proportion of the primary chamber: second chamber: calibrated openings is about 50-70: 25-35: 0.8-1.2.

Abstract: A fuel injector including a valve housing having a nozzle for columnarly injecting fuel and a valve seat continuing from the nozzle; a valve body reciprocatably mounted in the valve housing and having a valve portion adapted to abut against and retract from the valve seat and thereby close and open the nozzle, respectively; and an adapter fixed to a front end of the valve housing. The adapter is formed with an atomizer hole communicating with the nozzle and an assist air passage extending through a side wall of the adapter for supplying an assist air into the atomizer hole to atomize the columnar fuel injected from the nozzle. Both the valve portion and the valve seat are formed to have surfaces in a conical shape so that upon retraction of the valve portion, the space generated between the surfaces becomes uniform over substantially the length of the surfaces.

Abstract: A method of controlling the target idle speed of an internal combustion engine having sensors for monitoring engine coolant temperature, engine speed, and battery voltage.

Abstract: A secondary air feeding device comprising an air pump for feeding secondary air into the exhaust passage upstream of the three way catalytic converter. The air-fuel ratio is normally maintained at the stoichiometric air-fuel ratio by a feedback control. When the amount of fuel is to be increased, the feedback control is stopped, and the supply of secondary air is started. At this time, the amount of secondary air is basically calculated from the amount of fuel fed into the engine.

Abstract: The atomizer fits over the outlet of the fuel injector and comprises a thimble-shaped inner part that nests within a thimble-shaped outer part. Both inner and outer parts comprise holes in their end walls through which injected liquid fuel from the injector outlet passes. The inner and outer parts cooperatively define passages through which assist air is conveyed to the aforementioned holes to aid in the atomization of the injected fuel. Several embodiments of atomizers are disclosed.

Abstract: An engine speed control apparatus having an auxiliary air amount controller is disclosed. The apparatus has an actuator which is attached to an engine intake manifold so as to bypass a throttle valve and controls a flow rate of an auxiliary air and a control unit for driving the actuator. The control unit detects whether an engine is in an idling state or not on the basis of a combination of an engine rotational speed and other information. When the idling state is detected, a target value of an intake pressure on the downstream side of the throttle valve is set in accordance with the engine speed at that time. The control unit drives and controls the actuator so that the actual intake pressure coincides with the target value. Thus, when the operating mode of the engine is shifted from the non-idling state to the idling state, an air amount which is required by the engine can be accurately supplied and the engine speed can be rapidly converged to the target value.

Abstract: A control system for an internal combustion engine estimates an amount of adherent fuel adhering to the inner surface of the intake passage, as well as an amount of carried-off fuel evaporated from fuel adhering to the inner surface of the intake passage and carried into combustion chambers, determines an amount of supply fuel to be supplied to the engine, based upon operating conditions of the engine, the estimated adherent fuel amount, and the estimated carried-off fuel amount, and supplies the determined supply fuel amount into the intake passage. The control systems corrects the estimated adherent fuel amount and the estimated carried-off fuel amount, in response to an intake parameter which is changeable within the intake passage. The intake parameter includes an amount of evaporative fuel purged, valve operating characteristics of intake valves and/or exhaust valves, an amount of assist air supplied to fuel injection valves.

Abstract: An engine control apparatus and method can prevent hunting during engine deceleration in a reliable manner, thereby improving the driving sensation or comfort of the driver of a vehicle. An air/fuel mixture is supplied to engine cylinders through an intake passage with a throttle valve disposed therein, and a bypass passage with an air valve disposed therein is connected with the intake passage for bypassing the throttle valve to supply auxiliary air to the cylinders.

Abstract: The fuel supply apparatus for a multiple-cylinder internal combustion engine is comprised of a fuel supply means through which a fuel amount is injected into each combustion chamber of the engine. The fuel amount is corrected by fuel supply amount correcting means in a controller of the fuel supply apparatus, in accordance with intake port pressure near the fuel supply means to maintain a proper fuel injection even in various intake pressure conditions. The intake port pressure is estimated by intake port pressure estimating mean in the controller to search a data map in the intake port pressure estimating means, in accordance with an engine speed, an opening degree of the throttle valve, and an crankangle at the fuel injection start time.

Abstract: An apparatus supplies assist air toward an injection nozzle of a fuel injection valve of an internal combustion engine, to atomize an injected fuel. The apparatus starts and stops supplying the assist air according to engine operating conditions while correcting ignition timing or an engine intake air quantity, to thereby suppress fluctuations in engine output.

Abstract: A device at an intake system for internal combustion engines incorporating a return conduit (17) for exhaust gases between exhaust side and intake side, in said return conduit a valve (18) controlled by the engine speed, a connection flange (16) between engine block (10) and intake manifolds (14), said connection flange having through openings (14') for intake air to the cylinders (1-6), and an exhaust channel (17') arranged in the connection flange along the edge thereof, means for connecting the exhaust channel via said valve (18) to the engine exhaust side, said exhaust channel having branch conduits (20), communicating with the different through openings (14').

Abstract: A fuel/air mixture device for a dual injection valve including a single-part element which is suitable for various fuel injection valves without further adjustment measures. The single part element includes an envelope bush portion in contact with the injection end of the fuel injection valve in the form of stop surfaces and, together with this injection end, forms a narrow air gap so that the air is accelerated to almost sonic velocity and the fuel sprayed from the fuel injection openings is finely atomized. The device is particularly suitable for injecting a fuel air mixture into the induction pipe of an internal combustion engine with externally induced ignition.

Abstract: The invention relates to a mixture-compressing internal-combustion engine with secondary-air injection and with air-mass measurement as well as with an injection valve sequential fuel injection and air assistance, the air line provided for air assistance being equipped with a shut-off valve opening in the starting and the warmup phase of the internal-combustion engine.

Abstract: An internal combustion engine having an assist air supply device for finely dividing injected fuel and an exhaust gas recirculation device for selectively circulating an exhaust gas from an exhaust passage into an air intake passage. In this internal combustion engine, a swirl operation for a lean burn during a low load on the engine and a non-swirl operation for a burn based on a theoretical air-fuel ratio can be selectively switched between such operations. In the non-swirl operation, the supply of an assist air and the recirculation of a large amount of an exhaust gas are carried out. This makes it possible to reduce both specific consumption of fuel and the amount of NO.sub.x in the exhaust gas over the entire operational region of the engine.

Abstract: An apparatus for controlling idling revolution speed of an internal combustion engine in which air at an upstream side of a throttle valve of an intake tube of the internal combustion engine is injected nearby a fuel injection valve from an injection port provided in an intake manifold of the internal combustion engine through a bypass passage and a flow rate control device. The flow rate control device is provided with a valve housing and a valve seat retaining member having a cylindrical wall disposed within the valve housing and a valve body which is moved forwardly and backwardly by a stepping motor is seated on a valve seat. A flow space is formed between the valve seat and an outlet port provided in the valve housing for communicating thereof with the injection port.

Abstract: A thermally insulated engine (1) includes a combustion chamber which has principal portions made of a thermally insulating material and a turbocharger (2) which has a compressor coupled to a turbine (21) for supercharging the engine (1). The thermally insulated engine comprises an electric motor (3) mounted on a rotatable shaft (22) of the turbine, a detecting unit (13, 14) for detecting an operating condition of the engine, an oxygenating mechanism (6) having an oxygenating film, a compressor mounted on the rotatable shaft (22) of the turbine for delivering oxygenated air from the oxygenating mechanism (6) to the engine, and a control unit (5) for controlling the electric motor to assist in operating the compressor and controlling the amount of oxygenated air depending on the operating condition of the engine as detected by the detecting unit. When the engine is accelerated, for example, the concentration of oxygen in the intake air is increased for suppressing NOx and soot in exhaust gases.

Abstract: A fuel supply device comprising a plurality of air assist type fuel injectors each having a nozzle opening, an assist air passage connected to the nozzle opening, and a fuel valve for injecting fuel into the assist air passage. The assist air passages of all of the fuel injectors are connected to a common air manifold via corresponding assist air supply control valves. The air manifold is connected to a fuel pressure regulator for controlling the pressure of fuel fed into the fuel valves. This pressure of fuel is maintained at a pressure higher than the pressure of air in the air manifold, by a fixed pressure, by the fuel pressure regulator.

Abstract: An air-assist fuel injection system controls the supply of compressed air to the fuel injectors according to the operating status of internal combustion engine. For cold start operation, compressed air is supplied continuously to the injectors; while, for partial load (cruising) and partial acceleration, air is supplied as a pulsating (air volume control) flow consisting of air pulses coincident with the injected fuel pulses. On the other hand, for acceleration and deceleration, the supply of compresseed air to the injectors may be inhibited. Further, idle speed control can be achieved using the air-assist to the fuel injectors, thereby eliminating need for a separate idle speed control valve. To enhance system operation, a fuel injector may be employed in which both the fuel and the applied compressed air are swirled, but in opposite directions, so as to achieve a fuel spray of small particle size.

Abstract: An automatic fuel saver for a vehicle engine comprises a cyclonic turbulence chamber for connection between the engine intake manifold and the carburetor that supplies a fuel-air stream to the manifold. An air scoop is positioned at the front of the vehicle to collect supplemental air due to the forward motion of the vehicle. The supplemental air is conducted by a conduit to the turbulence chamber where it is introduced tangentially into the chamber and mixes cyclonically with the fuel-air stream being drawn into the engine from the carburetor, thereby providing supplemental oxygen to the engine in an amount which varies directly with the forward speed of the vehicle and the engine power demand.

Abstract: A vehicle has an internal combustion engine, and a throttle flap and an idling fill level regulator communicating with the internal combustion engine. An apparatus for controlling an opening degree of the idling fill level regulator includes a regulating apparatus for regulating the opening degree of the idling fill level regulator under certain operating conditions, and a control apparatus for controlling the opening degree of the idling fill level regulator over an entire operating range in accordance with memorized control values as a function an opening degree of the throttle flap and a motor speed. The regulating apparatus supplies control signals in an idling motor speed governing range, being superimposed on control values of the control apparatus.

Abstract: A fuel injection system for an internal combustion engine has two intake valves for a combination chamber. The fuel injection system is comprised of a fuel injector installed in an intake manifold to supply fuel into the engine. The fuel injector is formed with at least two fuel discharge openings through which fuel sprays are ejected respectively toward the two intake valves. The fuel injector is further formed with at least one air discharge opening through which air is ejected at a high speed toward a position between the fuel sprays thereby to positively separate the fuel sprays from each other.

Abstract: An internal combustion engine having its cylinders tilted at an angle of less an than 90 degrees relative to a vertical axis is provided with a oil drain mechanism for drainign excess oil that collects when the engine stops. For this purpose, an oil drain hole, which communicates with an interior of the piston body to drain the lubricating oil, is formed in the inner wall of an oil ring groove in such a way as to be located below the center line of the piston body. Both ends of the oil drain hole are set lower than the lowest portion of a piston head. Therefore, it is possible to prevent lubricating oil from entering the combustion chamber when the engine stops, without providing a whirl-stop on piston rings.

Abstract: A number of embodiments of outboard motors incorporating fuel and air enrichment devices in which fuel is supplied to the engine for enrichment under pressure by a pump and additional air is also supplied to the engine induction system at least at atmospheric pressure. In some embodiments, the air is mixed with the fuel and is pressurized. The fuel and air flow are both controlled by a common valve member that may be operated either by a solenoid or a heated wax pellet.

Abstract: An air induction control device for an internal combustion engine comprises means defining a communication passageway for communicating between air at atmospheric pressure and the air in the downstream passageway from a throttle valve. A valve member is disposed in the communciation passageway and is moveable toward the downstream direction thereof to open the communication passageway in response to an atmospheric pressure greater than pressure in the downstream passageway. A valve biasing means is disposed to apply force to and bias the valve member in the upstream direction to close the communication passageway in response to the pressure differential between atmospheric pressure and the air pressure in the downstream passageway. A flow restriction element positioned downstream of the valve member comprises calibrated openings defining a primary chamber and secondary chamber, wherein the volumetric proportion of the primary chamber:second chamber:calibrated openings is about 50-70:25-35:0.0-1.2.

Abstract: An electronic control device for motor vehicle comprises, a plurality of sensors for detecting the operation conditions of a motor vehicle, control device for calculating control data for the motor vehicle in view of output signals of the sensors, and for outputting control signals according to the control data, solenoid valve controlled in view of the control signals outputted by the control device, and failure detecting device for monitoring the state of the solenoid valve every predetermined period of time to determine that the solenoid valve and a drive circuit thereof are out of order, when the solenoid valve is held in the same state for a predetermined period of time.

Abstract: A throttle body assembly for supplying a mixture of fuel and air to an intake port of an internal combustion engine, integrally incorporating a fuel injection valve, a fuel pump, a fuel supply passage defined in the throttle body and extending from the fuel pump to the fuel injection valve, and a fuel pressure control valve directly incorporated in the throttle body to control pressure of fuel in the fuel supply passage. Thus, there is no need to use an external tubing system for supplying and returning fuel to and from the fuel injection valve, and the throttle body assemby may be simplified in structure so as to facilitate the assembling and servicing of the throttle body assembly. Further, an electronic control unit and sensors associated with the control unit are both directly mounted on the throttle body so that wiring around the throttle body may be eliminated.

Abstract: A control of an idling control valve which is arranged in a bypass air passage bypassing a throttle portion of a suction passage of an internal combustion engine and controlled by electric signals is carried out by setting an upper limit of electric current flowing in a drive circuit for the idling control valve, suppressing the electric current flowing into the drive circuit not to exceed the upper limit when an usual idling is effected, and releasing the electric current from the upper limit to flow electric current of a value larger than the upper limit to the drive circuit for a short time at a certain time of engine operation and/or at regular intervals.

Abstract: An intake system for an automobile engine with a manual transmission or an automatic transmission has a throttle valve disposed in an intake passage for distributing air into cylinders of the engine. A supplementary air distributor provided in association with the intake passage supplementarily distributes air into the intake passage between the throttle valve and engine. The supplementary air distributor is controlled by a controller to distribute different amount of supplementary air according to engine operating conditions. The controller is correctively controlled to vary the amount of supplementary air, by the supplementary air distributor according to atmospheric pressure for every distribution, so as to distribute a larger amount of supplementary air do an automobile engine with an automatic transmission than do an automobile engine with a manual transmission at the same atmospheric pressure.

Abstract: An auxiliary air control valve for engines wherein the valve has an intermediate peripheral portion enlarged to present a small gap to the valve seat port, and the front side of the intermediate peripheral portion and the rear side thereof formed to have slant surfaces so as to be diametrically and gradually reduced so that when the cooling water is at a low temperature, the front slant surface is positioned at the valve seat port, when the cooling water is at an intermediate temperature, the intermediate peripheral portion is positioned at the valve seat port, and when the cooling water is at a high temperature, the rear slant surface is positioned at the valve seat port, thereby being capable of controlling the quantity of intake air through the bypass passage.

Abstract: In a fuel injection system for a multi-cylinder internal combustion engine, a plurality of injection nozzles discharge fuel adjacent the engine inlet ports, and a single injector meters the fuel to all of the injection nozzles. The injector may include an annular valve surface, a plurality of discharge passages opening through the valve surface to direct fuel to the nozzles, and a single valve member associated with the valve surface to control fuel delivery to the discharge passages. The injector may include a rectifier valve that admits air to the discharge passages when the valve member precludes fuel delivery to the discharge passages. The fuel discharge lines that connect the injector discharge passages to the nozzles may be surrounded by air lines.

Abstract: A control apparatus for a suction air quantity of an engine adapted to detect a revolution number of the engine, to measure a difference between the detected revolution number of the engine and a target revolution number of the engine, and to regulate a suction air quantity in a bypass passage which bypasses a throttle valve of the engine corresponding with the difference so that the revolution number of the engine agrees with the target revolution number of the engine, which comprises misfire detecting means for detecting a misfire of the engine, means for outputting a first signal of correcting a timewise change of a suction quantity of the engine based on the difference between the revolution number and the target revolution number of the engine, means for retaining the first signal to a value just before the misfire in case of detecting of the misfire, and means for outputting a second signal for increasing the suction quantity so that the suction quantity is increased in case of detecting of the misfire.

Abstract: A jolt control wherein the amount of additional intake air is increased and the ignition timing is retarded to compensate for undesired variation in transmission output torque during a gear shift operation.

Abstract: An engine control valve is disclosed which comprises a first bypass passage for introducing auxiliary air flow to an engine from an upstream side of an intake throttle valve disposed in an air intake pipe of the engine while bypassing the intake throttle valve; a second bypass passage having an inlet port in communication with an outlet port of the first bypass passage, for introducing the auxiliary air flow, introduced through the inlet port, to a downstream side of the intake throttle valve; a valve body for changing an opening area of at least one of the outlet port of the first bypass passage and the inlet port of the second bypass passage, thereby adjusting an amount of the auxiliary air flow to be introduced from the upstream side to the downstream side of the intake throttle valve; and a drive unit for driving the valve body in accordance with a drive signal outputted from the control unit.

Abstract: A regulating device for rotary adjustment of a regulating member comprises a regulatable electrical control drive connected to the regulating member and a restoring device which acts on the regulating member or on the control drive and which returns the regulating member to a starting position in which, for example, the emergency operation of an internal combustion engine is ensured optimum operation of the regulating member without constant reference to the emergency situation, a release device is provided which is only effective during undisturbed normal operation of the control device and which produces a counterforce compensating for the restoring force of the restoring device.

Abstract: An engine speed control apparatus capable of controlling the idling speed of an engine without entailing abnormal rise or fall of engine speed while the engine is in operation in an idling mode.

Abstract: A fuel injection system of an internal combustion engine including air introducing passage device extending in one direction for introducing auxiliary air under pressure, annular fuel passage of a disc-like space extending radially outwardly from the air introducing means and substantially perpendicularly to the air introducing passage for introducing fuel for combustion, annular opening provided at inner end of the annular fuel passage for injecting the fuel into the auxiliary air flowing in the air introducing passage from position surrounding the auxiliary air flow at a right angle to the flowing direction of the auxiliary air so that the fuel is atomized to be mixed with the auxiliary air. The fuel from the fuel injecting means is substantially perpendicularly injected into the auxiliary air flow in the form of a thin membrane so that the atomization of the fuel can be effectively facilitated resulting in an improved combustion performance of the liquid fuel.

Abstract: Disclosed herein is an emission control device for use with a carburetor having a base and at least one fuel opening defined in its base. The device is comprised of a body member of predetermined thickness and defining therein at least one through opening. The through opening communicates with the fuel opening in the carburetor. The device also has an air passageway largely defined in its surface. The air passageway communicates with the through opening. The passageway lies generally adjacent the carburetor and the fuel opening so that air passed through the passageway passes into the through opening and under the fuel opening.

Abstract: A secondary air supply system for an internal combustion engine for suppressing combustion when a throttle valve is fully closed. A secondary air supply system is controlled with a microprocessor which controls other circuits such as the vehicle ignition circuit. Sensors provide outside air temperature data, internal pressure and engine rpm to the microprocessor. The microprocessor addresses the memory based on a computation including these sensed values. The memory in turn controls valves in a secondary air supply system.

Abstract: A valve assembly of novel configuration is associated with the main air induction passage of a fuel-injected, spark-ignited, automotive internal combustion engine for the purpose of regulating the idle air flow. The valve assembly has an inlet connected upstream of the throttle and an outlet connected downstream of the throttle. A pintle controls the restriction that the valve assembly imposes on the idle air flow. The valve assembly is controlled by the engine computer selectively energizing a solenoid on the assembly. In one embodiment the solenoid armature controls flow through another flow path of the valve assembly that parallels the idle air flow path. A movable internal wall divides the valve assembly's body into two variable volume chambers. One chamber forms part of the idle air bypass while the other forms part of the parallel flow path. The one chamber is essentially at manifold vacuum while the other is regulated by a bleed valve and two orifices in the parallel flow path.

Abstract: An idle control device for an internal combustion engine capable of controlling the idle speed of the engine in an appropriate manner over a wide operating range thereof and performing idle stabilization control when the engine operation is abnormal. In one embodiment, it is determined whether the engine is in a fast or a normal idling condition, and the number of engine rpm during fast idling is controlled to be at a target value which is higher than another target value for normal idling. In another embodiment, it is determined whether the operation of the engine is normal or abnormal, and the number of engine rpm is controlled to be at a target value when the operation of the engine is abnormal (i.e., the engine is likely to stall) even if the engine is erroneously determined to be out of idling due to sensor failure or the like.

Abstract: A fuel-air-mixture-forming device for an internal combustion engine, has a nozzle body (2) of rotational symmetry which, together with a throttle body (7) of rotational symmetry which is displaceable in the nozzle body, forms a convergent-divergent nozzle (10) which debouches into an intake pipe of the internal combustion engine. A fuel air slot (11) surrounds the convergent-divergent nozzle and debouches via a circumferential slot opening (12) into the nozzle. Fuel mixed with air is injected from the slot opening into the nozzle via a direction approximately transverse to the direction of the main air mass flow (L). In order to obtain an equalization of the closing forces caused by the vacuum on the throttle body, in accordance with the invention, the throttle body has an inner space (27) which is closed off from the nozzle and is provided with at least one pressure equalization cutout (28) which connects the nozzle with the inner space.