Exhaust gas cleaning device for internal combustion engine
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorsMasaaki Noguchi, Masaharu Sumiyoshi, Shinichiro Mizusawa
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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.
Claims12
An exhaust gas purifier for use in an internal combustion engine having a plurality of exhaust ports arranged horizontally relative to each other, said purifier comprising:
- an exhaust manifold connected to said posts for collecting therein exhaust gases generated in said engine;
- a catalyst container vertically installed in said exhaust manifold;
- said container having inner and outer cylindrical walls and upper and bottom annular end walls, said inner and outer cylindrical walls having perforations thereon, an outer passage defined between said outer cylindrical wall and an inner wall of said exhaust manifold, an inner passage being defined by said inner cylindrical wall therein;
- said exhaust manifold and said container being adapted to form a large space so that a thermal reaction of the exhaust gas takes place therein, said inner passage having a normally closed upper end;
- catalyst charged to form a catalyst bed within a space defined by said inner and outer cylindrical walls and said upper and bottom end walls therebetween;
- and
- an exhaust pipe connected to said container at a bottom opening of said inner passage for discharging exhaust gases to the atmosphere;
- the arrangement being such that exhaust gases are introduced from said engine into said large space in which part of the unburned gases of the exhaust gases are burned in the presence of oxygen contained in the exhaust gases by the thermal reaction, and these gases flow through said outer passage and perforations disposed in said outer cylindrical wall into said catalyst bed where catalysis occurs, and thereafter through perforations disposed in said inner cylindrical wall and into said inner passage and then through said inner passage to be discharged through said exhaust pipe to the atmosphere.
An exhaust gas purifier for use in an internal combustion engine having a plurality of exhaust ports arranged horizontally relative to each other, said purifier comprising:
- an exhaust manifold connected to said posts for collecting therein exhaust gases generated in said engine;
- a catalyst container vertically installed in said exhaust manifold said container having inner and outer cylindrical walls and upper and bottom annular end walls, said inner and outer cylindrical wall having perforations therein, an outer passage defined between said outer cylindrical wall and an inner wall of said exhaust manifold, an inner passage being defined by said inner cylindrical wall therein;
- said exhaust manifold and said container being adapted to form a large space so that a thermal reaction of exhaust gas takes place therein, means for closing and opening an upper opening of said inner passage;
- catalyst charged to form a catalyst bed within a space defined by said inner and outer cylindrical walls and said upper and bottom end walls therebetween;
- and
- an exhaust pipe connected to said container at a bottom opening of said inner passage for discharging exhaust gases to the atmosphere;
- the arrangement being such that when said means closes said upper opening exhaust gases introduced into said large space flow through said outer passage and perforations disposed in said outer cylindrical wall into said catalyst bed where catalysis occur, gases flow therefrom through perforations disposed in said inner cylindrical wall into said inner passage and then flow through said exhaust pipe to the atmosphere, and when said means opens said upper opening exhaust gases introduced in said large space flow mainly through said inner passage in which thermal reaction of said exhaust gases occurs thereby purifying said exhaust gases, and then flow through said exhaust pipe to the atmosphere so that very limited catalysis with said catalyst occurs thereby maintaining the temperature of said catalyst within a range of predetermined temperature.
Dependencies are inferred from the claim text.