Abstract: An ignition system for a multi-cylinder internal combustion engine eliminates high-voltage cables and a mechanical distributor in order to reduce electrical power losses due to joule effect caused mainly by the high voltage circuit, comprises a plurality of ignition coils and plugs, one provided for each cylinder, a distribution unit for distributing advance-angle control signals into the respective cylinders, and a booster for boosting the supply voltage in order to reduce the size of the ignition coil, in addition to the conventional ignition system. Furthermore, the ignition coil can be built integrally with the ignition plug for eliminating high-voltage cables connected between coil and plug.

Abstract: An ignition system for an internal combustion engine having a plurality of engine cylinders, wherein ignition coil and spark plug are integrally assembled into each engine cylinder so as to eliminate an ignition energy transmission loss, a DC-DC converter for boosting a low DC voltage into a high DC voltage is provided for applying the high DC voltage into each secondary winding of the ignition coils for achieving an efficient ignition of air-fuel mixture, the application of the high DC voltage being enabled according to a particular engine operating condition, e.g., engine low speed and light engine load condition, and the ignition energy being varied according to an engine operating condition by changing the pulsewidth of the ignition pulse signal to be fed into a cylinder judging circuit which judges the spark plug to be ignited and distributes the ignition pulse signal into the related circuit of the corresponding ignition coil.

Abstract: A system for forcefully igniting a spray of fuel injected into combustion chambers of a diesel engine during engine starting, in place of a conventional glow plug preheating system. The system comprises a plurality of spark plugs located within the respective combustion chambers of the diesel engine and an ignition means for sequentially igniting each of the spark plugs. The system is operated simultaneously with an engine starter motor and at least until the engine has achieved a spontaneous ignition state or most preferably until a fixed interval of time after the engine has achieved the spontaneous ignition state. Detection of the spontaneous ignition state is based on (a) combustion pressure; (b) engine speed; (c) oxygen concentration; (d) engine starter motor actuation (e) exhaust gas temperature; or (f) engine cooling water temperature.

Abstract: An internal combustion engine ignition system comprises: (a) a capacitive discharge ignition device having a voltage transformer which converts a low DC voltage into a corresponding AC voltage and boosts and rectifies the AC voltage into a first higher DC voltage for discharging each of the spark plugs sequentially, boosts and rectifies the AC voltage into a second higher DC voltage for generating arc-sustaining ignition energy, and rectifies the AC voltage into a third higher DC voltage; (b) an ignition signal generating means which generates and outputs an ignition signal whenever the engine rotates through a predetermined engine rotational angle offset by an angular interval determined by the engine speed and engine load; (c) an ignition coil means having a primary winding and secondary winding, one end of the primary winding thereof receiving the first DC voltage from the DC-DC converting means, the other end of the primary winding thereof being grounded when the ignition signal is received from the ignit

Abstract: In order to improve the cold starting efficiency of a an internal combustion engines using alcohol or low cetane type fuel, an ignition method provides an ignition mode in which a plurality of energizations of the ignition plugs per cycle is effected during engine cold starting operation which is detected by sensing at least one of the engine temperature and the engine speed. The number of energizations per cycle is returned to one after the engine has sufficiently warmed up. The method is applied to both of a plasma ignition system and a conventional spark ignition system.

Abstract: A spark plug for an internal combustion engine disclosed herein includes a resistive semiconductor body connecting a center electrode and an earth electrode to perform a creeping discharge at low discharge voltages while keeping adequate ignition performances.According to the invention, the spark plug comprises a back electrode at the back of a discharging gap to cause the creeping discharge on surfaces of an electric insulator which is resistant to electrolytic corrosion, thereby improving the durability of the plug and eliminating the trouble of electric waves of noises.

Abstract: A plasma ignition system for a multi-cylinder internal combustion engine each cylinder having a plasma ignition plug, including diesel engine. According to the present invention, in addition to the elements of the conventional plasma ignition system there is provided an oscillation device which generates and outputs a high-frequency oscillating voltage into each of the plasma ignition plugs to be ignited before the plasma ignition timing so that a multiple sparking occurs and therefore the resistance of the plasma ignition plug to be ignited is reduced to facilitate plasma ignition with relatively low plasma ignition energy without misfire even during a high engine load.

Abstract: An ignition plug for an internal combustion engine is disclosed which comprises an elongate electrode means inserted at the center of a plug body, another cylindrical electrode means encircling the electrode means and an insulator means provided between the elongate and cylindrical electrode means and forming a small cavity which is in communication with a combustion chamber. A plasma gas is created in the cavity due to the generation of a spark between the elongate and cylindrical electrode means and is jetted into the combustion chamber to ignite the air-fuel mixture therein. A gap into which the burnt gas is introduced is formed between the insulator means and the cylindrical electrode means so as to warm the wall of the cavity and thereby avoid ignition misfiring.

Abstract: A spark ignition fuel injection reciprocatory internal combustion engine with dual induction system is provided which has within a cylinder head a primary intake port passage to direct air charge into a cylinder to swirl therein and a secondary intake port passage to direct air charge into the cylinder in such a direction as to impede and reduce the swirling motion of the air charge issuing from the primary intake port passage. An intake valve, including a valve stem and a valve head, is reciprocably mounted within the cylinder head, and an annular wall or tube is fixedly positioned in a bore in the cylinder head. The primary intake port passage communicates with the exterior of this tube and the secondary intake port passage communicates with the interior of the tube. This tube extends to a position closely adjacent to, or in engagement with, the valve head of the intake valve when the valve is in the closed position.

Abstract: A spark ignition reciprocatory internal combustion engine with dual induction system is provided which has within a cylinder head a primary induction passage or a primary intake port passage to direct fluid charge into a cylinder to swirl therein and a secondary induction passage or a secondary intake port passage to direct fluid charge into the cylinder in such a direction as to impeded and reduce the swirling motion of the first fluid charge to provide a low "swirl ratio" within the cylinder, thereby to maintain the volumetric efficiency of the engine at a sufficiently high level. A primary throttle valve is provided to control the quantity of fluid charge entering into the primary induction passage and a secondary throttle valve is provided to control the quantity of fluid charge entering into the secondary induction passage.

Abstract: A spark ignition fuel injection reciprocatory internal combustion engine with dual induction system has within a cylinder head a primary intake passage to direct air fuel mixture charge into a cylinder to swirl therein and a secondary intake passage to direct air charge into the cylinder in such a direction as to impede the swirling motion of the air fuel mixture charge, thereby to maintain the volumetric efficiency of the engine at a sufficiently high level. A fuel injector is so positioned as to discharge fuel into the primary intake passage. An air flow sensor is provided upstream of primary and secondary throttle valves to detect the total of flow of induction air fed to the engine so that fuel is discharged at a rate proportional to the total induction air flow. Under engine operating conditions when only the primary throttle valve opens, air fuel mixture charge will swirl at a sufficiently high rate as to enhance evaporation and dispersion of fuel droplets.

Abstract: An auxiliary air intake passageway provided with a fuel jet opens into the main barrel between the main throttle and the intake manifold. A valve permits auxiliary air-fuel mixture to flow into the main barrel through the air intake passageway when the vacuum in the intake manifold exceeds a certain value during deceleration of the vehicle. The auxiliary mixture supply prevents excessive reduction of the exhaust gas temperature and resulting emission of unburned pollutants.