Abstract: A method and apparatus for calculating a target torque of an engine in accordance with operation condition of a vehicle, calculating a target intake air amount per engine revolution cycle required to generate the target engine torque, calculating an opening of a sub throttle valve disposed in an intake path of the engine from an opening of a main throttle valve disposed in the intake path, of which an opening is controlled in accordance with an operation amount of an accelerator pedal, and the target intake air amount, or calculating an equivalent throttle opening assuming the main throttle valve and the sub throttle valve as an equivalent throttle valve in accordance with the target intake air amount, calculating the sub throttle valve opening by correcting the equivalent throttle opening with a correction coefficient determined by the relationship between the equivalent throttle opening and the main throttle valve opening, and on/off controlling the sub throttle valve in accordance with the calculated sub t

Abstract: A valve assembly for regulating air flow to an internal combustion engine comprises a valve body having a valve bore forming an induction passage, and a shaft extending across the valve bore. A valve member is secured to the shaft for rotation in excess of 90 degrees between a nonactuating position and a maximum actuating position. The valve member passes through a zero degree position when rotated from the maximum actuating position to the nonactuating position. The flow area around the valve member when in the zero degree position is less than the flow area when the valve member is in the nonactuating position. A return mechanism urges the valve member toward the nonactuating position when the valve member is rotated away from the nonactuating position.

Abstract: A system and method for controlling engine output applicable to an automotive vehicle are disclosed in which when an engine output control condition is not satisfied and a predetermined follow-up control release condition is not satisfied, a second throttle valve additionally installed in series with a first throttle valve associated with an accelerator is controlled so as to follow up the angular displacement (opening angle) of the first throttle valve. Therefore, a sticking of the second throttle valve due to adhering or freezing of rust or foreign matters thereonto can be prevented. In addition, the follow-up control of the second throttle valve permits the second throttle valve to be displaced in a low opening angle required for the engine output reduction control in a short period of time. Thus, a responsive characteristic of reducing a slip rate on drive wheels can be improved. When the follow-up throttle valve is returned toward its fully open position.

Abstract: A controlling system for a vehicle-carried internal combustion engine which prevents the rotational speed of the engine from rising excessively high even when an accelerator pedal is operated in a condition of a power transmitting system wherein it does not transmit the driving force of the engine from a transmission to a wheel of the vehicle whether the vehicle is in a stopping condition or in a driving condition. Such condition of the power transmitting system is detected by a driving force transmitting condition detector, and when such condition is detected, a controller controls a throttle valve of the engine so that the opening of the throttle valve may not exceed a predetermined throttle opening greater than an idling throttle opening irrespective of an operation amount of the accelerator pedal.

Abstract: A throttle is disposed in the intake port per cylinder. At idle, the throttles are closed. The pressure in the intake port per cylinder increases during the intake valve closed period due to flow admitted to the intake port downstream of the throttle until it recovers to ambient before the valve overlap period. The flow rate is controlled individually per cylinder such that it is higher during the intake valve closed period than it is during the intake valve opened period. This allows the increased valve overlap to be used without increasing the residual mass fraction in the cylinder. As a result, the stability engine operation at idle and part load range is improved.

Abstract: A system and method for controlling engine output applicable to an automotive vehicle are disclosed in which when engine output control to reduce the engine output through a second throttle valve (additionally installed in an engine intake passage in series with a first throttle valve interlocked with an accelerator element) is ended, a returning speed of the second throttle valve toward its fully open position is made slower than that carried out during the engine output reduction control so as to suppress drive wheel slippage and a target opening angle of the second throttle valve by which the second throttle valve is returned to the open position is set to an opening angle of the first throttle valve to which an offset quantity is added to improve acceleration response immediately after engine output control has been carried out.

Abstract: In a throttle-valve connection (1), two intake channels (2, 3) are provided alongside of each other, each having a throttle valve (4, 5). The two throttle valve (4, 5) are driven by separate setting motors (17, 18). The setting shaft (6, 7) of the throttle valve (4, 5) are connected to each other by an entrainment connection (8) which has play. Sliding clutches (9, 10) permit rotation of the throttle valve (6, 7) in the direction towards idling even if the gearing (11, 12) or setting motor (17, 18) is blocked.

Abstract: A load-shifting device has a control element (4a, 4b) which acts on a setting member (7,9) which determines the output of an internal combustion engine. The control element is adapted to be connected to an accelerator (1) and is controllable by an electric setting drive (10) which cooperates with an electronic controller (12). The load-shifting device provides that the setting member includes a main setting member (7) with which there is associated a first control-element part 4a which is coupled with the accelerator. The setting member further includes an auxiliary setting member (9) with which there is associated a second control-element part (4b). The setting path of the first control-element part is limited in idling direction by an idle stop (LL). The second control-element part can, upon application of the first control-eleemnt part against the idling stop, be moved within its idling control range relative to the first control-element part by the electric setting drive.

Abstract: An apparatus for controlling a throttle valve comprises a motor for rotating a throttle valve so as to adjust the valve opening degree, a gearing disposed between the motor and the throttle valve for transmitting driving force of the motor to the throttle valve, and a return device serving to return the throttle valve to a regular set position thereof. The return device includes a tension spring.

Abstract: Several embodiments of vehicles having automatic or manual speed control. The manual speed control permits the operator to control the speed of the engine and the automatic speed control is effective when a power takeoff shaft is being driven for automatic speed control under this condition. In each embodiment, the automatic speed control includes a governor that is driven only when the power shaft takeoff is being driven. In one embodiment, a throttle valve controls the engine speed and the manual and automatic speed controls alternatively operate the throttle valve through selectively engageable couplings that are operated in response to shifting into and out of the power takeoff mode. A number of other arrangements are also illustrated and described that provide different throttle valve arrangements for controlling the speed automatically or manually.

Abstract: In a throttle valve controlling apparatus, there is provided a pair of first and second throttle valves. The first throttle valve is rotated by an electrically controlled actuator means, whereas the second throttle valve is rotated by an accelerator pedal. A first return spring is provided on the first throttle valve so as to return this valve to a first closed position when the electrically controlled actuator means is brought into malfunction, by which an engine speed is rapidly reduced. Under this malfunction condition, the second throttle valve can be independently controlled by the accelerator pedal.

Abstract: A fuel supply control system for an internal combustion engine having a throttle body, and a fuel injection valve arranged in an intake manifold upstream of the throttle body for supplying fuel to all cylinders. An air throttle valve has a valve body having a notched opening formed therein and disposed to be opposite the nozzle of the fuel injection valve to increase the flow speed of intake air in the vicinity of the nozzle when the air throttle valve is fully closed. An electronic control unit controls the fuel injection valve in response to operating conditions of the engine. The electronic control unit causes the air throttle valve to be fully closed when a predetermined low rotation-speed operating condition of the engine, in which at least the rotational speed of the engine is lower than a predetermined value, is satisfied. The predetermined value of the rotational speed of the engine is set such that the lower the atmospheric pressure the smaller the predetermined value.

Abstract: In a throttle valve controlling apparatus, there is provided a pair of first and second throttle valves. The first throttle valve is rotated by an electrically controlled actuator, whereas the second throttle valve is rotated by an accelerator pedal. A relative position limiting device is interposed between the electrically controlled actuator and a calculation/controlling unit. This calculation/controlling unit enables the electrically controlled actuator to be controlled by transferring a rotation command signal. When the calculation/controlling unit is brought into malfunction, the relative position limiting device interrupts supply of the rotation command signal from the calculation/controlling unit to the electrically controlled actuator, so that the first throttle valve is forcibly returned to its fully close position by means of a return spring.

Abstract: In a device on a motor vehicle with an internal combustion engine as the drive source and an accelerator pedal and transmission means for controlling the power of the internal combustion engine a switch activated when the accelerator pedal is actuated is provided in the power control system, which switch, in the non-activated state, prevents the internal combustion engine from delivering power exceeding its idling power. If the internal combustion engine is provided with an overrun cut-off for interrupting the fuel supply during overrun operation, the switch can be the idling switch of the overrun cut-off.

Abstract: A two cycle crankcase compression fuel injected internal combustion engine has a first set of one or more throttle valves (104, 106) controlling combustion air flowing into the crankcase, and a second set of one or more throttle valves (110, 112) also controlling combustion air flowing into the crankcase. A throttle position sensor (104, 106) and controls fuel injection according to throttle position. Increased resolution of sensed throttle position at low engine speed is provided by admitting combustion air only through the first set of throttle valves (104, 106) and not through the second set of throttle valves (110, 112) at low engine speed for an initial given range of motion, such that greater movement of the first set of throttle valves (104, 106) is required to obtain a given amount of combustion air flow for a given engine speed, prior to opening the second set of throttle valves (110, 112), to provide more accurate fuel injection and better driveability.

Abstract: An apparatus for actuating the throttle valve of an internal combustion engine, in particular a drive slip control (ASR) and engine drag moment control (MSR), with a disconnect point disposed in the course of the gas pedal transmission linkage overcome by spring forces acting on both sides of it. In the normal situation the throttle valve position corresponds to the driving pedal position, while in attaining ASR functions the disconnect point is opened, by the action of an electromagnetic or electric-motor element, and the position of the throttle valve is adjusted independently, regardless of the intention of the operator, in order to reduce the drive slip.

Abstract: A throttle assembly (10) for an engine comprising: a primary throttle plate (16) rotatably mounted on a first shaft (18); linkage (22) for rotating the first shaft (18) in response to operator demand; a second throttle plate (42) received within a cut-out (30) formed in the first throttle plate and rotatably mounted relative to the first shaft; and an actuator (50) for rotating the second throttle plate relative to the first throttle plate to adjust the flow area of a second flow passage formed between the first and second throttle plates.

Abstract: An engine control apparatus for assuring stabilized operating performance by detecting the combustion state of gas mixture within an engine cylinder and determining the amount of air supplied to the cylinder in dependence on the detected combustion state.

Abstract: An actuating arrangement connected with throttle valves of suction pipes of an internal combustion engine which are to be actuated synchronously. The throttle valves include bearing shafts and cooperate by way of levers with a linkage of the actuating arrangement. For the compensation of tolerances of the actuating arrangement, especially angular tolerances of the throttle valves, yielding members are provided between the linkage and the bearing shafts, and a device stresses the throttle valves into the closed end positions.

Abstract: Several embodiments of vehicles having automatic or manual speed control. The manual speed control permits the operator to control the speed of the engine and the automatic speed control is effective when a power takeoff shaft is being driven for automatic speed control under this condition. In each embodiment, the automatic speed control includes a governor that is driven only when the power shaft takeoff is being driven. In one embodiment, a throttle valve controls the engine speed and the manual and automatic speed controls alternatively operate the throttle valve through selectively engageable couplings that are operated in response to shifting into and out of the power takeoff mode. A number of other arrangements are also illustrated and described that provide different throttle valve arrangements for controlling the speed automatically or manually.

Abstract: An automotive type internal combustion engine has an air throttle body for providing air to the engine for combination with fuel injected to define a fuel air charge; the air throttle body having primary and secondary air passages controlled by throttling valves, the primary passage being a drive-by-wire electrical system in which the throttle valve is moved electrically in response to movement of the vehicle accelerator pedal, the secondary passage being controlled by a throttle valve that has a direct mechanical connection to the vehicle accelerator pedal to be operative at wide open or near wide open throttle positions of the accelerator pedal to not only supply additional air for wide open throttle operation, but also to supply sufficient air to sustain engine operation in the event of inoperativeness of the electrical system or the actuator/motor affecting movement of the primary throttle valve.

Abstract: A suction system to an inlet valve of a reciprocating piston internal combustion engine consists of a suction line adapted to be closed by a closure valve and of a by-pass line by-passing the closure valve. A check valve is inserted into the by-pass line which is formed by slots in the suction line and spring lamellae covering the same from the outside. In order to reduce throttle losses and to permit a dynamic charging effect to become effective, the closure valve is fully opened at rotational speeds above 3,500 rpm.

Abstract: A traction control system includes means for detecting a vehicle driving condition and disabling traction control for reducing driving torque distributed to vehicular driven wheels for avoiding wheel slippage when a predetermined vehicle driving condition is detected. In the practical control, a vehicle speed is taken as a traction control enabling/disabling criterion for disabling control while the vehicle speed is lower than a given criterion.

Abstract: Apparatus including a mixing chamber is installed between a standard carburetor base and the intake manifold of a gasoline engine. The mixing chamber includes an air inlet port for admitting a controlled amount of outside air into the mixing chamber and a gasoline vapor port for admitting gasoline vaporized externally of the carburetor into the mixing chamber, a carburetor inlet port for receiving a mixture of air and partially vaporized gasoline from the carburetor throat, and an outlet port through which a mixture of all the gases exhausts into the intake manifold. The carburetor includes a first throttle valve for controlling the air amount and partially vaporized gasoline passing into the mixing chamber. A second throttle valve controls the amount of mixed gas drawn through the mixing chamber outlet port into the intake manifold. A linkage connected to the automobile accelerator cable opens the second throttle in response to initial accelerator displacement.

Abstract: A wheel slip control system has a vehicle speed detector for detecting a running speed of a vehicle; a driving wheel rotating condition detector for detecting an actual driving wheel rotating speed of the vehicle and the acceleration thereof; an advance driving wheel speed computer for calculating an advance driving wheel speed using as parameters the above actual driving wheel rotating speed and acceleration thereof; a second throttle valve provided in an intake passage in a position upstream or downstream of the position where a first throttle valve interlocked with a vehicle accelerator pedal is located; a driver for opening and closing the second throttle valve; and an opening/closing controller for determining a target throttle position on the basis of the detected vehicle running speed and the advance driving wheel speed and controlling the driver so that an actual throttle position of the second throttle valve approaches the above target throttle position.

Abstract: An operation control system for an internal combustion engine includes a mechanically connecting device connecting between an accelerator pedal and a throttle valve and operable such that an amount of change in the valve opening of the throttle valve relative to a change in the stepping amount of the accelerator pedal is smaller in a smaller stepping amount region than in a larger stepping amount region. A throttle valve opening sensor is adapted to generate as actual throttle valve opening an output signal directly proportional in valve to a stepping amount of the accelerator pedal. A control unit is responsive to the output signal from the throttle valve opening sensor for controlling an operating amount of the operation control system.

Abstract: An induction system for an internal combustion engine for improving running throughout the entire engine speed and load ranges. The induction system comprises a first intake passage that serves the chamber through a first intake port and a second intake passage that serves the chamber through second and third intake ports. The effective cross-sectional area of the first intake passage is substantially smaller than that of the second intake passage and staged throttle valves are incorporated so that the charge requirements at low speed are supplied primarily through the first intake passage.

Abstract: An apparatus including a mixing chamber is installed between the base of a standard carburator and the intake manifold of a gasoline engine. The mixing chamber includes an air inlet port for admitting a controlled amount of outside air into the mixing chamber and a gasoline vapor port for admitting gasoline vaporized externally of the carburator into the mixing chamber, a carburator inlet port for receiving a mixture of air and partially vaporized gasoline from the throat of the carburator, and an outlet port through which a mixture of all the gases is exhausted into the intake manifold. The carburator includes a first throttle valve for controlling the amount of air and partially vaporized gasoline that passes into the mixing chamber. A second throttle valve is disposed to control the amount of mixed gas drawn through the outlet port of the mixing chamber into the intake manifold.

Abstract: A traction control device in an engine which has an intake passage. A throttle valve and a flow control valve are arranged in series in the intake passage. Where acceleration of the motor vehicle is carried out, when the speed of rotation of the driven wheel or acceleration of the speed of rotation of the driven wheel exceeds a predetermined level, the flow control valve is closed. When the speed of rotation of the driven wheel becomes lower than a predetermined level or deceleration of the speed of rotation of the driven wheel becomes larger than a predetermined level, the flow control valve is opened.

Abstract: A carburetion system for an internal combustion engine wherein a plurality of throttle blades cooperates with a throttle body to form channels for high speed airflow at part throttle conditions. The airflow exits the channels as coherent streams, and these streams collide downstream from the throttle to generate a region of severe velocity change which serves to finely atomize liquid fuel which has been introduced into the airflow streams.

Abstract: A device molding a link member interconnecting an actuator to arms fixed onto valve shafts of rotary valves arranged in gas passages. The link member includes a control rod connected to the actuator and a plurality of plate springs which extend from the control rod and are outwardly bent. The outer ends of the plate springs are pivotally connected to the tips of corresponding arms.

Abstract: A throttle control device for the general purpose engine having a throttle lever for moving a throttle valve of the carburetor and a choke lever for moving a choke valve of the carburetor. The choke lever and the throttle lever are moved together with each other in a predetermined timing. A control panel pivotally supporting the throttle lever and the choke lever is swingable in a predetermined angle range.

Abstract: A throttle linkage assembly comprising a throttle shaft rotatable about a throttle shaft axis between an idle position and a wide open throttle position, a throttle plate fixed on the throttle shaft, a driven lever pivotable about the throttle shaft axis between various angles relative to the throttle plate, an adjustment lever assembly for fixing the driven lever at a selected angle relative to the throttle plate, and a timing plate operable on the driven lever for rotating the throttle shaft from the idle position to the wide open throttle position.

Abstract: An intake system for an automotive engine having cylinders, primary intake ports communicated with the cylinders, and secondary intake ports communicated with the cylinders. Each of the primary and secondary intake ports is communicated with a corresponding cylinder at a common intake valve. A primary intake manifold communicated with the primary intake ports and a secondary intake manifold communicated with the secondary intake ports are provided. A control valve is provided in each branch of the secondary intake manifold for controlling a counter flow of induced mixture. A vacuum operated actuator opens the control valve in dependency on an increase of engine speed and load on the engine.

Abstract: An air introduction system of a fuel injection type engine, including a main passage and a fuel injector for injecting fuel into the main passage. Assist air is introduced to the surrounding of a top nozzle portion of the fuel injector so that the assist air acts on the fuel injected from the injector. A subpassage is connected to the main passage so as to supply the assist air. A main valve is disposed in the main passage and a subvalve is disposed in the subpassage. The main and subpassages are formed in a single throttle body.

Abstract: A carburetion system for an internal combustion engine wherein the cooperation of throttle blades with the throttle body forms channels for high velocity fuel/air mixture flow at part throttle conditions. Fuel is introduced into air flowing through the main intake passage upstream of throttle blades. At partial throttle conditions, the fuel/air mixture flows substantially only through the channels. Fuel/air mixture emerges from the channels at high speed. The channels can be configured such that the emergent fuel/air mixture streams from the channels are directed on convergent paths. Converging streams from the channels collide in the air intake downstream from the throttles, where the severe turbulence resulting from the convergence causes liquid fuel to be finely atomized and evenly suspended in the intake air. Some of the liquid fuel from the mixture may separate onto the walls of the throttle body as a result of passage through the channels or turbulence from the region of convergence.

Abstract: An air-air/fuel throttle body is provided with a secondary throttle valve of a differing diameter and operating in a different cross-sectional area of the throttle body induction passage, the upstream throttle valve being positively connected to the vehicle accelerator pedal to assure a like opening or closing movement of the latter throttle valve upon movement of the accelerator pedal, the construction assuring that main control of the flow of air and changes in manifold vacuum will be retained by the lower smaller diameter servo operated throttle valve operating in a smaller cross-sectional area.

Abstract: Engine air flow is controlled by principal and supplementary throttles--the principal throttle being positioned by a stepper motor but also having a mechanical linkage to assure at least partial throttle opening when required, and the supplementary throttle being positioned by a mechanical linkage to permit primary control of engine output by the principal throttle while assuring that engine output is minimized when required.

Abstract: A duplex carburetor for an internal combustion engine has a primary barrel having a primary venturi for supplying an air-fuel mixture to an intake manifold under a full range of engine loads and a secondary barrel having a secondary venturi for supplying an air-fuel mixture to the manifold under higher engine loads. The primary venturi has a cross section which ranges from 20% to 30% of that of the secondary venturi. The secondary barrel has a flattened cross-sectional shape such as of a segment of a circle of an ellipse, and is located adjacent to the primary barrel. The intake manifold is of a duplex construction having primary and secondary common passages connected to the primary and secondary barrels, respectively, of the carburetor. The secondary passage of the manifold has a flattened cross-sectional shape such as of a segment of a circle or an ellipse, and is positioned adjacent to the primary passage.

Abstract: An air intake system for a supercharged automobile engine comprises a supercharger disposed on an air intake passage, a primary throttle valve disposed in a primary passage downstream of the supercharger and operatively coupled to an accelerator pedal, a secondary throttle valve disposed in a secondary passage and adapted to be controlled in association with the primary throttle valve, an auxiliary throttle valve in the secondary passage upstream of the secondary throttle valve, and an actuator operable to maintain the secondary throttle valve in a full open position when and so long as the load on the engine is equal to or larger than a predetermined medium load and to gradually open the secondary throttle valve with increase of the suction pressure when and so long as the load on the engine is smaller than the predetermined medium load.

Abstract: An electronic ignition and fuel control system is provided for internal combustion automotive vehicle engines which are of the spark ignition type. The ignition and fuel control system of this invention includes an electronic timing and detector circuit, distributor circuit, clock and command circuit, ignition power circuit and air-fuel control circuit. The clock and command circuit responds to selected positioning of an accelerator control element to provide either a plurality of firing pulses to the engine ignitors in an acceleration mode of operation, or to provide single pulse firing in the case of steady state operation or a deceleration mode of operation. In the ignition and power circuit, individual coils are provided for generating a high voltage firing pulse applied to each of the ignitors that are interconnected with the respective coil.

Abstract: A fuel supply system for an internal combustion engine having at least one combustion chamber comprises a supercharger, a fuel intake passage system leading from a source of air to the combustion chamber through the supercharger. A portion of the fuel intake passage system between the supercharger and the combustion chamber is divided into first and second intake passages having incorporated therein primary and secondary throttle valves. The primary throttle valve is operatively associated with a foot-operated acceleration pedal whereas the secondary throttle is adapted to be controlled by a pressure developed inside the fuel intake passage system at a position downstream of the throttle valves. A diaphragm valve unit is utilized to control the secondary throttle valve in response to the pressure inside the fuel intake passage system at that position.

Abstract: An air/fuel ratio compensating device is provided for association with an internal combustion engine having a fuel control valve, air suction pipe means and pedal accelerator means, the compensating device including an area flow metal system made up of a flow detection valve positioned upstream in the air suction pipe means and operatively associated with the fuel control valve, a flow control valve positioned downstream in the air suction pipe means in series with the flow detection valve and being operatively connected to the accelerator pedal means, the area flow meter system enabling the difference in pressure existing on opposite sides of the flow detection valve to be maintained at a predetermined value to insure that the amount of air flow is proportional to the opening area of the flow detection valve thus permitting a determination of the amount of air flow on the basis of the opened area of the flow detection valve, a feedback control mechanism for controlling the area control flow meter and includi

Abstract: The invention relates to a speed limiting device for a vehicle driven by an internal combustion engine provided with a twin-body carburettor or a dual fuel injection unit comprising two throttle butterfly valves controlled by the vehicle's accelerator pedal through an operating mechanism, a flexible connection mechanism combined with at least one of the said throttle valves and a depression valve calibrated at a given depression value corresponding to a vehicle speed not to be exceeded and designed to operate, above the said given speed, in the direction of closure, at least one of the said throttle valves combined with the said flexible connection means.The flexible connection means (3-7, 15) is placed between the said throttle valves (P.sub.1, P.sub.2), one of which (P.sub.1) is controlled by the movements of the accelerator pedal, and comprises a spring (6) of the right stiffness to lock the said throttle valves (P.sub.1, P.sub.

Abstract: In a multi-cylinder internal combustion engine with a single fuel injection valve provided in a manifold entrance, a fuel supply system including a primary and a secondary passage formed by partitioning the manifold entrance is disclosed wherein the portion of the secondary passage located on the outer circumferential surface of the primary passage in the joined portion of each exit of both passages is formed ring-shaped and the exits face the floor surface of a riser portion. Thus, the fuel supply system makes it possible to maintain satisfactory fuel atomizing characteristics during all driving conditions and to obtain uniform mixture distribution characteristics with respect to each engine cylinder.

Abstract: An intake air throttle valve control system for a diesel engine which greatly reduces vibration, noise and rough engine running at idling speeds. An intake passage connected in series with the intake manifold of the engine is divided into first and second parallel intake passages. A throttle valve is disposed in a first intake passage to provide a throttling effect therein in response to predetermined engine conditions such as engine temperature, oil line pressure and/or exhaust manifold pressure. A negative pressure control valve is disposed in the second passage to maintain a negative pressure downstream of first and second passages at a fixed value to prevent the pressure from being overly reduced by the throttle valve.

Abstract: An air-fuel mixture is delivered at a certain predetermined velocity through a pressure-regulated gate to a dual screen atomizer consisting of a first comparatively coarse mesh screen in contact with a finer mesh screen close to the throat of the gate. The liquid fuel is atomized to uniform size droplets in the small micron range and a homogeneous charge is created in an enlarged plenum downstream from the dual screen atomizer. Pressure in the downstream plenum is reduced in comparison to the pressure existing in the fuel mixture delivery passage upstream from the gate.

Abstract: An electronic type air/fuel ratio control system for use in gasoline engines comprises an accelerator, a detector of the manipulation angle of the accelerator, a shunt conduit by-passing a throttle valve, an air by-pass valve exposed in the shunt conduit for controlling flow rate of by-pass air, and a control circuit. The control circuit is responsive to the output of the accelerator manipulation angle detector and generates a control signal for the air by-pass valve, whereby the air/fuel ratio can be controlled with high accuracy when the flow rate of air is low.

Abstract: A carburetor for a multi-cylinder internal combustion engine which has for each cylinder a main combustion chamber defined above the piston in the cylinder and a sub-combustion chamber defined above the main combustion chamber and communicating with the latter through a torch nozzle. The carburetor has a main intake passage and a sub-intake passage for supplying a comparatively lean mixture and a comparatively rich mixture to the main and sub-combustion chambers respectively. The carburetor has a single throttle valve shaft extending across the main and sub-intake passages with a main throttle valve and a sub-throttle valve mounted on the valve shaft and disposed in the main and sub-intake passages respectively.The main and sub-throttle valves are attached to the single throttle valve shaft at the same attaching angle and have respective parallel surfaces and outer peripheral edge surface.

Abstract: An internal combustion engine comprising a carburetor having a throttle valve. A secondary throttle valve is arranged in the intake passage at a position located downstream of the throttle valve of the carburetor. When the engine is operating under a light load, the secondary throttle valve remains fully closed. When the engine is operating under a heavy load, the secondary throttle valve remains fully opened. The intake passage located upstream of the secondary throttle valve is interconnected with the intake passage located downstream of the secondary throttle valve via an auxiliary intake passage having a cross-sectional area which is extremely smaller than that of the intake passage.