Abstract: A stratified combustion engine provided with a prechamber having no inlet valve associated therewith, wherein the precombustion chamber comprises a first chamber communicating with a main combustion chamber, a second chamber communicating with the first chamber only through an orifice, and a discharge electrode disposed in the orifice. In the suction stroke, a lean fuel-air mixture is charged into the main combustion chamber, while a stream of a rich fuel-air mixture, which is deflected in the direction of flow by impinging against the back face of an inlet valve, is introduced into the first chamber from the main combustion chamber through a communication passage, so that the so-called stratified charge can be achieved. In the compression stroke, the rich fuel-air mixture is charged from the first chamber into the second chamber through the orifice.

Abstract: An igniting apparatus for internal combustion engines comprises a central igniting electrode disposed at the position adjacent to an opening communicating, between an auxiliary combustion chamber and a main combustion chamber, an earthed electrode consisting of an inner circumferential portion in close to the opening and an electric source means supplying discharge voltage between both the electrodes, whereby lean mixture can be easily ignited and the electric source means has a sufficient discharge duration to energize the mixture and combustion gases passing said opening.

Abstract: A flow rate control mechanism for use in controlling the flow rate of exhaust gases in an exhaust gas re-circulating system of an internal combustion engine. This mechanism includes a swirl flow chamber having a circular cross section, a first nozzle and a second nozzle, the former of which is open through the inner wall of the swirl flow chamber therein in the direction normal thereto and the latter of which is open through inner wall of the swirl flow chamber therein in the direction tangential thereto. The latter nozzle is positioned close to the opening of the former or first nozzle. The first nozzle directed in the normal direction extracts part of exhaust gases through an exhaust manifold, while the second nozzle directed in the tangential direction is communicated with atmosphere. The opening of the first nozzle is close to the opening of the second nozzle, so that the pressure at the opening of the first nozzle approximates the atmospheric pressure.

Abstract: A carburetor for a stratified combustion engine with a precombustion chamber comprises a first body having first and second bores for supplying lean mixture into a main combustion chamber of the engine, a second body having a third bore for supplying rich mixture into the precombustion chamber, and an actuator for swinging a throttle valve provided in said third bore in accordance with a function proportional to a negative pressure within said first bore. The carburetor is adapted to allow any desired arrangement of said first body and said second body in spaced relation with each other so as to facilitate the arrangement of various equipments in an engine room as well as the design of the engine.

Abstract: A safety device to be used in an apparatus for cleansing the exhaust gas in an internal combustion engine, comprising an OR-NOR fluidic amplifier, an inlet port of which is connected to the downstream of an exhaust manifold and one of outlet ports of which is connected to the upstream of the cleansing apparatus, the other outlet port being connected to the upstream of a by-pass which diverts from the downstream end of the exhaust manifold to form a passage differing from that of the cleansing apparatus, the by-pass being provided with two-way valve means therein by which the by-pass may be opened or closed.

Abstract: A spark ignition engine of the carburetor single chamber type stratified charge combustion system wherein air and rich mixture are supplied successively by the same path, comprising a barrier arranged in the combustion chamber for directing the intake gas flow, said barrier projecting from the wall of the combustion chamber into the interior of the combustion chamber, whereby the air and rich mixture are positively stratified in the order in which they are drawn into the combustion chamber.

Abstract: Herein disclosed in an exhaust gas cleaning system for an internal combustion engine. The cleaning system comprises a change-over valve having its inlet port communicating with an air pump, its first outlet port communicating with the exhaust system of the engine and its second outlet port communicating with the intake system of the engine through a flow control valve. The change-over valve has communication of its outlet ports switched in accordance with the temperature of a catalytic converter which is disposed in the exhaust system.In a modification, a duct providing communication between the second outlet port of the change-over valve and the flow control valve is provided to communicate with the exhaust system.

Abstract: An improved air flow direction control valve particularly adapted for use with an exhaust gas purifying system on an internal combustion engine to control the direction of flow of air to be mixed into exhaust gas for effecting additional combustion of the uncombusted constituents therein. The valve essentially comprises a pair of valve members selectively operable to open one of two main outlets and a diaphragm operated shaft for selectively operating the two valve members upon movement between a first and a second position. The shaft is formed with a pair of shoulders which define a reduced diameter shaft portion therebetween, and the two valve members encircle the reduced diameter shaft portion in an oppositely facing relation.

Abstract: An indicator of vehicle service intervals for use in a vehicle comprising a transducer for transducing the revolution of the transmission output shaft of the vehicle into an electrical signal, an electrolytic integrating element electrolytically corroded by the output signal of the transducer, and a display unit for giving visible and audible alarms in response to the circuit cut-off action of the time limit element. In the system, successive pulses representing the distance traveled by the vehicle are integrated to cause progressive electrolytic corrosion of the electrolytic integrating element, and the alarm is displayed when the total traveled distance attains a predetermined value.

Abstract: A stratified-combustion type internal combustion engine wherein a rich fuel-air mixture passage and an air passage both open into the main combustion chamber. A pre-combustion chamber is located adjacent to the main combustion chamber and communicates therewith by means of a connecting port which communicates with the main combustion chamber adjacent to the opening of the rich fuel-air mixture passage, whereby the rich fuel-air mixture is supplied to and burnt within the pre-combustion chamber.

Abstract: A value proportional to suction pressure is added to the difference between the maximum value and the minimum value of a pulsating exhaust pressure. When the sum exceeds a predetermined value, misfire of an engine is detected. The difference and the sum are formed electrically or pneumatically.

Abstract: An internal combustion engine provided with a supercharging system in which each cylinder head of the engine cylinders is provided with a valve controlled subordinate port connected to a pressurized intake air supply source, and valve actuating means actuates each valve of the subordinate inlet ports shortly before the piston within each cylinder comes into a compression stroke thereof so that the pressurized air flowing into the cylinder agitates and attenuates the fuel mixture sucked from the valve controlled inlet port.

Abstract: In the device disclosed, a catalytic converter purifies exhaust gas from an engine. A sensor measures the temperature of the converter and an amplifier amplifies the measurement to produce a temperature signal. A differentiator produces a time-differential of the signal multiplied by a constant representing the time constant of the sensor. An operating circuit adds the multiplied time-differential to the signal to produce a voltage that is compensated for the response delay of the temperature sensor. Electromagnetic relays respond to the voltage by diverting the gases and the secondary air around the converter.

Abstract: An ignition system for a gasoline engine comprising an ignition coil to which an electric current is supplied from a battery through a transistor. The transistor is so controlled as to turn on and off in response to switching off and on of a contact breaker. A current flowing through the breaker points of the contact breaker is increased temporarily in accordance with the operating conditions of the engine for preventing fouling or damage of the breaker points due to contaminants deposited thereon.