Abstract: Disclosed is an electrically-operated fuel pump for pumping fuel such as gasoline, light oil and heavy oil, comprising a pump housing; a motor having a rotating shaft and encased centrally in the pump housing, the motor comprising a rotor formed by fixing a permanent magnet to the rotating shaft thereof and a stator arranged around the rotor, the stator having plural windings of coils adapted to be sequentially excited to rotate the rotor; a pump section encased in the pump housing below the motor and operatively connected to the rotating shaft of the motor; and an electric circuit package made of an oil-resistant and water-resistant material and incorporated in the pump housing above the motor, the electric circuit package oil-tightly incorporating a plurality of rotor position detecting devices for detecting an angular position of the rotor, wherein a portion of the electric circuit package facing to the rotor is made of a paramagnetic material.

Abstract: An electromagnetic fuel injection valve for an internal combustion engine having a valve body with a single fuel injection hole and a plurality of injected fuel paths. A meeting portion of the injected fuel paths is provided downstream of the fuel injection hole and upstream of the injected fuel paths. A wall of the meeting portion is formed to have an inner transverse dimension not smaller than a total corresponding transverse dimension of walls of the injected fuel paths. An injected fuel dividing portion provided below the fuel injection hole has an upwardly facing sharp edge. These structures enable a smooth flow and a smooth division of the injected fuel. Desirably, a length (L) of the injected fuel paths, an equivalent diameter (Di) of the injected fuel path, a diameter (d) of the fuel injection hole and a number (n) of the injected fuel paths have the following relationships:30.gtoreq.n(Di/d).sup.2 .gtoreq.203.gtoreq.L/Di.gtoreq.

Abstract: Disclosed herein is an electromagnetic fuel injector comprising a fuel outlet opening formed at the front portion of the slide member of the valve body, an annular fuel passage leading from the fuel outlet opening to the valve seat and an annular restricted portion provided at the annular fuel passage. The fuel injector of the invention may compensate decrease in the amount of fuel flow because of decrease in the specific weight of fuel and creation of fuel vapor at the fuel injection nozzle in association with increase in fuel temperature, and may supply an engine with fuel mixture having stable air-fuel ratio to purify exhaust gas during engine operation at high temperatures.

Abstract: An electronically controlled carburetor for an internal combustion engine for a vehicle has a variable venturi for varying the venturi cross-section and concurrently varying the amount of air metered into the venturi in response to the engine demands an air flow sensor for sensing the displacement of the variable venturi and producing related electrical signals in response to changes in air flow through the venturi, a main fuel nozzle for discharging metered fuel into the venturi, a fuel flow sensor for sensing pressure differential of fuel across a main fuel jet communicating with the main fuel nozzle and for producing related electrical signals in response to changes in fuel flow through the main fuel jet, an air bleed controlling actuator for controlling the amount of air to be bled into the main fuel nozzle, and a control circuit responsive to the output signals from the air flow sensor and the fuel flow sensor for driving the air bleed controlling actuator.

Abstract: A method of driving a valve in an injector for an internal combustion engine which intermittently injects liquid fuel by the valve reciprocally moving by attraction force of a solenoid coil and repulsive force of a spring and an apparatus for carrying out the method. An armature secured to the valve to be attracted by the solenoid coil and/or an iron core of the solenoid coil is made of a permanent magnet. The pulse shape of an electric current to be applied to the solenoid coil is made in the form of a stepped wave in which the electric power in the initial stage of application is larger than that in the later stage. An inverse pulse for inversely exciting the solenoid coil is formed to give the permanent magnet of the armature repulsive force upon fall of the pulse wave of the electric current applied to the solenoid coil.

Abstract: An air-fuel ratio control device for controlling the air-fuel ratio of a mixture to be supplied into an internal combustion engine. The device has a control circuit adapted to produce, in accordance with the offset of the output of an oxygen sensor in the exhaust system of the engine from a reference value corresponding to the desired air-fuel ratio, a control signal for making the air-fuel ratio coincide with the command air-fuel ratio. The device further has a mixture supplying means including means for adjusting the air-fuel ratio in accordance with the control signal. The air-fuel ratio adjusting means includes an actuator incorporating a step motor adapted to change the opening area of fuel passage or air bleed passage of a carburetor.

Abstract: In a carburetor system having an electrically-heated choke system including a first heat generating member which is heated by the power supplied from a battery and a first thermo-sensitive member which is deformed by the heating operation of the first heat generating member and adapted for controlling an opening and closing operation of a choke valve by the deformation of the first thermo-sensitive member, and a fast idle system adapted for controlling an opening and closing operation of a throttle valve, the inventive carburetor controlling system comprises a second heat generating member which is heated by the power supplied from the battery, a second thermo-sensitive member which is deformed by the heating operation of the second heat generating member and controls an opening and closing operation of the throttle valve, a control circuit connected between the battery and the first and second heat generating members, a thermosensor for detecting an atmospheric temperature.

Abstract: An air-fuel ratio control device for controlling the air-fuel ratio of the mixture to be supplied to internal combustion engine, in which a control level can be made to shift instantaneously even if the engine running condition changes abruptly so that smooth and accurate control of the air-fuel ratio can be performed. Integrators in the control circuit are provided with limiters to place upper and lower limits on the integrated value so as to prevent hunting under the idling condition.

Abstract: A feedback type variable venturi carburetor in which the negative pressure regulated by the variable venturi at a constant level is supplied to a solenoid valve which is opened and closed at a frequency of 5-30 Hz and whose open-close time ratio is controlled in accordance with the signal from exhaust gas sensor to control the vacuum pressure applied to a diaphragm chamber of an air-bleed flow control means thereby controlling the air-fuel ratio of the mixture at an optimum level. This invention obviates the use of a regulator for regulating the negative pressure from the intake manifold and precludes the drawbacks experienced with conventional carburetors, such as the slow response in the feedback control caused when the main fuel system and the idling system of the conventional carburetor are switched over, and the unstable supply of fuel when the fuel begins to be delivered from the main fuel system.

Abstract: There is provided an air-fuel mixture ratio correcting system for a carburetor in which the air-fuel ratio of a mixture fed to an engine is detected whereby to control the amount of auxiliary fuel and/or the amount of auxiliary air to always control the air-fuel ratio of the mixtures at the correct value.

Abstract: An air-fuel ratio control device capable of accurately controlling the air-fuel ratio of the mixture to be supplied to the engine, without being affected by the external conditions such as the atmospheric pressure and the temperature of the air drawn into the engine. The control signal of the air-fuel ratio control device contains a sensitivity component whose magnitude varies in proportion to a time of duration for which the "rich" or "lean" input signal has continued, so that the air-fuel ratio of the mixture can be properly controlled for all engine running conditions, i.e., either when the engine is running under a light load condition or under a heavy load condition.

Abstract: A floatless variable venturi type carburetor in which the float chamber is substituted by a fuel pressure regulator. The carburetor has, in addition to the ordinary constituents such as variable orifice, fuel metering jet and air bleed, a fuel valve disposed in the fuel passage leading to the fuel metering jet and adapted to be opened and closed in relation to the turning on and off of the engine key switch, and a fuel pressure regulator adapted to regulate the pressure of the fuel introduced to the fuel metering jet through the fuel valve. The fuel pressure regulator has two regulating chambers, one of which being communicated with the inlet side of the fuel valve while the other being in communication with a venturi vacuum pickup port, so that the fuel pressure regulator maintains a constant pressure differential, by the action of a diaphragm separating two regulating chambers, between the fuel pressure at the inlet side of the fuel metering jet and the venturi vacuum.

Abstract: An air-fuel mixture supplying device for internal combustion engines, in which sonic nozzles are disposed facing each other in such a manner that their center lines lie in the same horizontal and vertical planes so that the fuel ejected from the nozzle is pulverized and mixed with bleed air ejected from the opposing nozzle in optimum condition. During intermittent ejection of fuel, two injector valves inject fuel alternately so that the fuel particles ejected from the opposing nozzles do not collide with each other but only strike against and mix with the bleed air. This eliminates the possibility of fuel particles becoming agglomerated and produces desirable air-fuel mixtures.

Abstract: An air-fuel ratio control device characterized by the fact that an electromagnetic valve which controls the air bleed quantities for both high- and low-speed fuel systems simultaneously has a pin inserted in a valve disc so as to prevent the rotation of the valve disc but allow it to move axially for open-close operation, so that the valve disc and the seat always contact at the same contacting portion and maintain a perfect seal therebetween. This enables an accurate control of the air bleed quantitiy and therefore of the air-fuel ratio.

Abstract: An improved exhaust gas control apparatus, which utilizes a 3-way catalyst for reducing the contents of harmful components in exhaust gas, incorporates a diaphragm type air pump for supplying secondary air, upstream of the catalyst, to the exhaust gas. A chamber, which is formed on one side of the diaphragm in the air pump, is communicated through an electromagnetic changeover valve with the upstream side of the catalyst.

Abstract: An apparatus for controlling the amount of secondary air fed into an internal combustion engine includes means for controlling the response speed of a secondary air flow control means in accordance with the amount of exhaust gas emitted from the engine. Thus, the equivalent air-fuel ratio can be correctly controlled, without delay, in response to changes in the operating condition of the engine.

Abstract: An air-fuel ratio controller for use in an internal combustion engine, of a type having an exhaust gas sensor disposed in the exhaust passage, a control circuit and a solenoid valve having a valve seat in which passages open leading to the air bleeds of the slow and main systems of the carburetor, the controller being adapted to actuate a valve of the solenoid valve, in accordance with a signal derived from the exhaust gas sensor, into and out of contact with the valve seat, so as to simultaneously control the flow rates of bleed air in the air bleeds of the slow and main systems. A recess is formed in the cooperating surface of the valve seat or the valve, at a position between the openings of the passages in the valve seat. This recess communicates with a chamber which in turn communicates with the air inlet.

Abstract: A fuel-air mixture supply system comprising a Venturi portion formed on the inner surface of a cylindrical suction system having a throttle valve therein, at least one fuel injection port provided in the Venturi portion and open into the suction system, an atomizing chamber located adjacently to the fuel injection port in a co-axial manner to the fuel injection port and having a nozzle to make the atomizing chamber communicate with the fuel injection port, a fuel injection valve connected to the cylindrical suction system to inject the fuel into the atomizing chamber at a predetermined pressure and an air bleed passage making the portion above the throttle valve in the suction system communicate with the atomizing chamber. The fuel injected into the atomizing chamber from the fuel injection valve is atomized by the air drawn into the chamber from the suction system through the air bleed passage.

Abstract: Disclosed is an apparatus for controlling the amount of secondary air fed into an internal combustion engine. The apparatus includes an independent means for rapidly applying an absolute pressure signal to a secondary air flow control means, so that secondary air is rapidly supplied into the engine when the secondary air flow control means is being reset in its initial position, and then, next, a rich signal is applied. Thus, the equivalent air-fuel ratio can be correctly controlled, without delay, in response to changes in the operating condition of the engine.

Abstract: There is provided an air-fuel mixture ratio correcting system for a carburetor in which the air-fuel ratio of a mixture fed to an engine is detected whereby to control the amount of auxiliary fuel and/or the amount of auxiliary air to always control the air-fuel ratio of the mixtures at the correct value.