Abstract: A fuel heating apparatus for an internal combustion engine has a tubular extension member extending downwardly from the bottom end of an intake pipe into a mixture distribution chamber defined in an intake manifold beneath the inlet opening thereof connected to the intake pipe. An annular electric heater element is disposed in the mixture distribution chamber in vertical alignment with the tubular extension member so that the part of fuel which flows in liquid phase on the inner peripheral surfaces of the intake pipe and the tubular extension member falls therefrom onto the annular electric heater and heated and vaporized thereby and can be easily mixed with air from the intake pipe.

Abstract: A fuel evaporator comprises a metal member composed of a pipe portion and a flange portion, a heating element made of PTC ceramic, which is closely adhered to the metal member and an electric connector for electrically connecting the heating element and an electric power source. The metal member is supported by an insulating member which is interposed between an air-fuel passage and an intake manifold. The fuel film flow flowing downwards along the wall of the air-fuel passage is received by the flange portion of the metal member and is heated by the heat transmitted from the heating element. Consequently, unvaporized fuel is effectively evaporated.

Abstract: An intake manifold for a multicylinder internal combustion engine having fuel supplying means such as a fuel injection device or a carburetor includes a branch intake conduits each communicating with one of the cylinders of the engine, an extension tube connected to a primary suction conduit of the carburetor, and an incoming fuel charge heating device mounted on the bottom of the intake manifold. The extension tube has a curved portion in its wall directed toward a part of the surface of the bottom of the intake manifold at which the axial center lines of the branch intake conduits gather together and cut to form an open end of the extension tube. The incoming fuel charge heating device has a heating surface disposed near the open end of the extension tube, which is smoothly curved toward the bottom of the intake manifold.

Abstract: An ignition device for a multi-cylinder internal combustion engine having an ignition coil, also positive and negative high voltages being alternately generated across the secondary winding of the ignition coil, and a distributor, the distributor comprising a center electrode, two electrical distributing conductors in the rotor of the distributor, the center electrode being connected electrically with the two electrical distributing conductors, the electrical distributing conductors including at least one center conductor and two projecting conductors for distributing electric power to side electrode, two diodes having opposite polarities being connected between the center conductor and the projecting conductors for electrical distribution, respectively, and a plurality of side electrodes adapted to be electrically coupled successively with the projecting conductors according to the rotation of the rotor, whereby positive and negative high voltages are supplied alternately to the side electrodes through the c

Abstract: A fuel evaporator for an internal combustion engine is comprised of a metallic casing which is composed of a heating plate portion and a supporting portion projecting from the outer periphery of the heating plate portion downward, a heating element fixed to the heating plate portion within the casing, an insulating and adiabatic covering member which covers the supporting portion and an electrically connecting means which connects the heating element and a battery.The supporting portion of the casing is inserted in a hole formed in an intake pipe so that the heating plate portion is exposed therewithin.Since the supporting portion of the casing is covered with the insulating and adiabatic covering member, very little of the heat of the heating element is dissipated from the supporting portion into the intake pipe.By forming the supporting portion into a plurality of strip shaped legs, the heat escaping therefrom can be further reduced.

Abstract: An ignition system for a spark-ignition engine includes an ignition coil for applying a high voltage to each spark plug, a switch device connected in series with the secondary of the ignition coil for preventing in response to its conduction the supply of the high voltage to the spark plug, and a control circuit for turning on the switch device at a predetermined time after the generation of the high voltage, whereby the discharging at the spark plug is prevented under the combustion condition.

Abstract: A fuel evaporator for an internal combustion engine comprises a casing composed of a heating plate member, a supporting member projecting from the outer periphery of the heating plate member underwards and a heat resistant and electric insulating covering member which covers the supporting member, a heating element can be fixed to the heating plate member within the casing and an electrically connecting means which connects the heating element and an electric power source. The fuel evaporator further comprises an elastic cushion member which is disposed in the under surface of the heating element and a spring means which supports and presses the heating element against the heating plate member of the casing through the cushion member. Due to the elasticity of the cushion member, the heating element is uniformly pressed by the spring means without being broken.

Abstract: A fuel evaporator for use in a fuel entry system of an internal combustion engine comprises a heating element of ceramics having a positive temperature coefficient of resistance, a thermally conductive covering plate which covers the heating element in the fuel entry system and a connecting means which electrically connects the heating element to an electric power source.The connecting means comprises two electrifying routes and switching means which breaks one electrifying route or selectively connects the two electrifying routes in parallel or in series in accordance with the driving condition of the engine.The fuel droplets falling within the fuel entry system can be evaporated by only a small amount of electric power with high efficiency.And by controlling the electric power consumed by the fuel evaporator, the starting condition of the engine can be maintained good.

Abstract: An engine ignition system includes a throttle sensor for detecting the position of a throttle valve. A control circuit is responsive to the detected throttle signal as well as the signals from other negative pressure and engine rpm sensors to generate a spark plug discharge start signal and a discharge stop signal. A high voltage generator supplies a high voltage to the respective spark plugs during the time interval between the time that the discharge start signal is generated and the time that the discharge stop signal is generated.

Abstract: An ignition device for a rotary piston engine includes a glow plug which is mounted at an ignition port formed in an engine housing to communicate with a combustion and operation chamber and which, when electrically powered, is heated to red hot to ignite an air-fuel mixture in the combustion and operation chamber. The glow plug ignites the air-fuel mixture through a communicating port which is formed to face the combustion and operation chamber and which has a smaller aperture area than the cross-section area of the ignition port.

Abstract: An ignition system for rotary piston engines includes a glow plug in addition to the normal leading spark plug and trailing spark plug. The glow plug is mounted in the housing of the engine on the leading side with respect to the trochoidal minor axis in the direction of the rotor rotation and performs continuous ignition of the mixture during low speed and load operation of the engine. Thus, during the low speed and load operation the glow plug performs ignition in place of the leading spark plug whereas during other engine operating conditions the leading spark plug and the trailing spark plug perform the ignition of the mixture.

Abstract: The temperature of a glow plug mounted on an epitorocoidal engine housing on a leading side of the torocoid minor axis of a rotary piston engine in the direction of the rotor rotation is sensed. When the sensed temperature exceeds a predetermined temperature within a temperature range which allows the ignition of air-fuel mixture, power to the glow plug is stopped whereby the life of the glow plug is extended and the power consumption is saved.

Abstract: An ignition system for rotary piston engine wherein a glow plug mounted in the epitrochoidal housing of the engine is supplied with electric power to maintain the surface temperature of the glow plug within a range from 900.degree. to 1100.degree. C. A control unit for controlling the supply of electric power to the glow plug produces an output pulse signal the pulse width thereof being varied depending on engine operating conditions such as the amount of fuel supply and engine rotational speeds. A power circuit receives the pulse signal from the control unit and on-off controls the supply of electric power to the plug from a battery.

Abstract: A rotary piston engine comprises a housing having a trochoidal peripheral wall and side walls on both sides thereof, a rotor adapted to perform a planetary rotary motion along the inner surface of the peripheral wall, and intake and exhaust ports formed in the housing. The engine performs intake, compression, combustion and exhaust strokes of a working fluid in accordance with the planetary rotary motion of the rotor. An air injection port is formed in the peripheral wall of the housing between the exhaust port and a portion of the minor axis of the trochoidal curve, being adapted to communicate with the intake chamber formed between the peripheral wall and the rotor.

Abstract: A rotary piston engine comprises a housing having a trochoidal peripheral wall and side walls on both sides thereof, a rotor adapted to perform a planetary rotary motion along the inner surface of the peripheral wall and intake and exhaust ports formed in the housing. The engine performs intake, compression, combustion and exhaust of a working fluid by means of the planetary rotary motion of the rotor. An air injection port is formed in the peripheral wall of the housing between the exhaust port and a portion of the peripheral wall through which the minor axis of the trochoidal curve extends.

Abstract: There is provided an ignition system for a rotary piston engine comprising first and second ignition means mounted in a rotor housing. The first ignition means is positioned ahead of the second ignition means in the direction of rotation of a rotor. Switching means is actuated in response to the output signal of an engine speed sensor and an intake manifold vacuum sensor so that current is supplied to the second ignition means only during specified periods such as during the high engine speed operation and high engine load operation.