Abstract: An exhaust gas cleaning device purifier for use in an internal combustion engine of a multicylinder type, comprising a housing to be disposed between exhaust ports of a cylinder head and an exhaust pipe in which housing a catalyst container is enclosed, the catalyst container consisting of two cylinders between which catalyst is filled, a control valve being provided on the catalyst container for passing a part of exhaust gas through the catalyst, thereby a part of the exhaust gas is passed or not through the catalyst in accordance with the conditions of the engine.

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: A catalytic reactor for the exhaust gases of a motor vehicle comprising a catalyzer bed through which a pipe extends having one end connected to a secondary-air source. The other end of the pipe connected to a chamber wherein a simple and economical temperature detector, such as bimetal, is installed. When the temperature of the catalyzer bed exceeds a predetermined value, as measured by the temperature detector, a valve is electrically activated by an electrical circuit containing said detector, whereby exhaust gas bypasses said catalyzer bed.

Abstract: An installation for the catalytic afterburning of exhaust gases in the exhaust gas system of an internal combustion engine, which is equipped with a by-pass line by-passing the installation for the catalytic afterburning, whereby a throttle valve actuated in dependence on the temperature of the installation for the catalytic afterburning is arranged in the by-pass line; to prevent the throttle valve from getting stuck due to rusting, the throttle valve is actuated also independently of the temperature of the installation for the catalytic afterburning, in dependence on at least one parameter of the internal combustion engine.

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: A catalytic converter for the exhaust gas of an internal combustion engine has an internal by-pass structure in which the position of a bed temperature responsive valve determines whether inlet gas will flow through or around the catalyst bed.

Abstract: An installation for the catalytic afterburning of exhaust gases of a multi-cylinder internal combustion engine with two exhaust gas lines of which each includes at least one catalyst; means are thereby provided for conducting the entire exhaust gas stream, when the internal combustion engine is cold, only through one of the two catalysts for a predetermined time.

Abstract: This specification discloses an exhaust gas cleaning device which is intended for removing harmful substances from exhaust gases of internal combustion engine, especially for removing carbon particles or the like.The device has a body accomodating a filter element adapted to catch the particles in the exhaust gases. The device is attached to the engine as if it were an exhaust manifold so that the clogging particles are conveniently burned by hot gases, whereby the filter element is conveniently recovered.

Abstract: Reaction heat generated by oxidation in presence of an oxidation catalyst maintains a sufficient after-burning temperature during low engine load operation.