Abstract: To be able to efficiently and rapidly reduce noxious exhaust gas components after starting of an engine without impeding activation of a catalyst device, and moreover to be able to perform rapid separation of noxious exhaust gas components, an adsorption device 5 for adsorbing noxious exhaust gas components is provided downstream of a catalyst device constituting a main mode of operation of exhaust-gas purification, a honeycomb body carrying adsorbent is disposed within the adsorption device, a bypass passage is formed to one side of the honeycomb body, and a switching valve is provided upstream of those components. After engine starting, the switching valve opens, exhaust gas flows in the passage on the honeycomb body side, and HC is adsorbed by the adsorbent.

Abstract: A process for treating an engine exhaust gas stream is disclosed. The process involves arranging a catalyst bed and a molecular sieve bed side by side with a connecting pipe between and parallel to the two beds. When the engine is first started, the cool exhaust is flowed through the catalyst bed, then through the connecting pipe, then through the molecular sieve bed and finally discharged to the atmosphere. When the molecular sieve bed reaches a temperature of about 150.degree. C. to about 200.degree. C. the exhaust stream is diverted such that it is first flowed through the molecular sieve bed, to desorb the adsorbed hydrocarbons, and then through the catalyst bed and finally discharged to the atmosphere. Finally, when all the hydrocarbons are desorbed from the molecular sieve bed, the exhaust stream is diverted such that it is flowed through the catalyst bed and then discharged to the atmosphere.

Abstract: A marine propulsion device comprising a propulsion unit including a propeller shaft, a housing including an exhaust gas inlet and an exhaust gas outlet, a catalytic element supported in the housing for reorientation from a first orientation to a second orientation different from the first orientation, and structure for reorienting the element from the first orientation to the second orientation.

Abstract: In an exhaust system for an internal combustion engine having a main exhaust conduit with a catalytic converter arranged remote from the engine and a bypass exhaust conduit which includes a start-up catalytic converter arranged close to the engine and joins the main exhaust gas conduit ahead of said remote catalytic converter, an ejector structure is arranged in the main exhaust gas conduit within a housing defining a suction chamber in communication with the bypass exhaust conduit for drawing gas through the bypass exhaust conduit into said main exhaust gas conduit whenever exhaust gas flows from the engine through the main exhaust gas conduit and a main exhaust conduit valve is arranged between the ejector structure and the junction of the main and the bypass exhaust conduits which is closed during start-up operation of the engine to thereby force the exhaust gas to flow through the suction chamber and the bypass exhaust gas conduit via the start-up catalytic converter.

Abstract: An exhaust gas purifying apparatus comprising a first and a second casings having expansion chambers, respectively, a third casing arranged between the first and second casings to form a passage therebetween, an inlet pipe introducing the exhaust gas into the first expansion chamber, and an outlet pipe discharging the exhaust gas from the second expansion chamber, whereby a muffler is constituted. The apparatus also comprises a filter arranged in the third casing to trap particulates in the exhaust gas, and a heater arranged adjacent to the filter on the side of the second expansion chamber to burn the particulates deposited on the filter, to regenerate the filter. A flow control unit, comprising a bypass and a valve therein, is arranged such that the exhaust gas normally flows through the filter and the heater, and when the filter is regenerated, at least a part of the exhaust gas flows in reverse through the heater and the filter. This exhaust gas purifying apparatus is built-in to the muffler.

Abstract: An exhaust cleaner system for use in the exhaust system of a diesel engine is provided with a particulate filter positioned in a trap housing with an exhaust inlet thereto and an exhaust outlet therefrom. A pair of exhaust ducts are positioned in the inlet end of the exhaust outlet whereby to define, in effect, three separate exhaust flow zones through the filter and a flow limiter valve is operatively positioned to sequentially control flow through the exhaust ducts. Glow plugs are located so as to extend into the zones of the filter associated with the exhaust ducts to initiate incineration of particulates during reduced exhaust flow conditions as controlled by the flow limiter valve.

Abstract: A filtration system is disclosed which removes particulates from the exhaust gas of a diesel engine. The system has (a) a filter element, (b) oxidation means for conducting a flow of heated gas through at least a portion of the filter element, the heated gas being effective to ignite the particulates in that portion, and (c) a flow control means. The flow control means has walls dividing the filter element into first and second portions, and a flow diverter effective to normally permit full exhaust gas flow through both of said filter portions, and effective to selectively permit exhaust glow through only one of the filter portions while permitting flow of heated gas of the oxidation means through the other of said filter portions.

Abstract: An exhaust gas cleaning device comprises at least one exhaust gas flowing passage, at least one particulates collecting member composed of two filter elements having different heat capacity, which is disposed within the exhaust gas flowing passage and heating means which is interposed between the filter elements so as to be closely contacted therewith. The filter element having smaller heat capacity is disposed on the upper stream side of the heating means and the filter element having larger heat capacity is disposed on the downstream side thereof. The filter element having smaller heat capacity is rapidly heated by the heating means and the heat of the filter element having smaller heat capacity is transmitted to the filter element having larger heat capacity. All of the particulates collected by the particulates collecting member can be burnt off with excellent heat efficiency.

Abstract: An exhaust gas cleaning device for an internal combustion engine comprises a housing provided with an inlet port which is communicated with an exhaust pipe of an internal combustion engine and an outlet port, two particulates collecting members disposed in two independent exhaust gas flowing passages which are communicated with the inlet port through an inlet chamber and with the outlet port through an outlet chamber, a butterfly valve provided in the inlet chamber for alternately directing the exhaust gases into either one of the exhaust gas flowing passages and a heated air supplying means for burning off the particulates collected by the particulates collecting members, which is provided with a heated air outlet port opening into the inlet chamber so as to be opposed to the inlet port with the butterfly valve therebetween.

Abstract: An exhaust gas cleaning device comprises a casing provided with an inlet port which is communicated with an exhaust pipe of an internal combustion engine and an outlet port, two particulates collecting members disposed in two independent exhaust gas flowing passages which are communicated with the inlet port and the outlet port of the casing, a valve means provided on the downstream side of the two exhaust gas flowing passages for selectively passing the exhaust gases into either one of the exhaust gas flowing passages and a heated air supplying means provided on the downstream side of the collecting members for selectively supplying heated air into either one of the particulates collecting members.

Abstract: An exhaust cleaner and burner system for diesel engines provides for the trapping of particulates in the engine exhaust gases by their passage through a filter element. Collected particulates on the filter element are incinerated by the use of a heater means with the necessary air required for combustion of the particulates being drawn through the filter element by engine vacuum in the intake manifold of the engine. By throttling the air flow into the intake manifold so as to maintain a substantially constant depression therein, the required fuel burner mixture air flow needed for the combustion of carbonaceous particulates collected on a filter element is obtained during engine operation.

Abstract: A dual filter element exhaust cleaner and burner system for diesel engines provides for the trapping of particulates in the engine exhaust gases by their passage through filter elements, as selectively controlled by means of a four-way valve. Collected particulates in a non-active particulate filter element are incinerated by means of a heater, with this filter element, during incineration, being supplied with exhaust gases through a constant flow exhaust gas regulator whereby incineration of the particulates will occur at a controlled rate independent of engine speed.

Abstract: Method for reducing particulated carbon from the exhaust gas stream of an internal combustion engine which includes a combustion supporting ingredient. The particles are initially retained on a gas pervious bed. The latter is periodically treated by passing therethrough a gaseous mixture comprising a major portion of the particle-carrying gas, into which a minor portion of said gas, which has been treated to substantially deplete it of said particles and said combustion supporting ingredients, has been mixed.

Abstract: An arrangement of dual element alternate flow exhaust cleaner and burner device for diesel engines is disclosed which provides trapping of particulates in the engine exhaust gases by their passage through either of the two elements. Collected particulates of carbon and other combustibles in the other nonactive element are electively incinerated by excess air or oxygen containing gas heated by a suitable burner or heater device. The incinerated products from the inactive element are redirected into the exhaust stream to pass through the active element for the cleansing of particulates remaining from the burnoff process before discharge.