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AssigneeEmitec Gesellschaft fur Emissionstechnologie mbH
InventorsWolfgang Maus, Helmut Swars, Hans-Jurgen Breuer, Theodor Cyron
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A method of accelerating the response of an exhaust gas catalyst downstream of an internal combustion engine, the exhaust gas catalyst having at least one metal catalyst carrier body coated with ceramic and catalytically active material having a given response temperature, and the carrier body having at least one subzone, the method includes supplying electric power to the metal catalyst carrier body for direct heating at least in subzones thereof, switching on the current for a period of time at least as early as immediately after the onset of engine operation, and dimensioning the current such that at least subzones of the metal carrier body are heated to the given response temperature at least as early as the exhaust gas reaches the given response temperature. The apparatus for performing the above method includes a main catalyst and an electrically heatable precatalyst disposed upstream of the main catalyst as seen in the flow direction of the exhaust gas. The electrically heated precatalyst carrier body comprises layered metal sheets forming a stack with a plurality of channels through which a fluid can flow, the metal sheets having a thickness of substantially 0.03 to 0.06 mm, insulators for electrically subdividing the catalyst carrier body for forming at least one electric current path through the metal sheets, the current path having an electric resistance of substantially between 0.2 and 2.OMEGA..
A method of accelerating the response of an exhaust gas catalyst system downstream of an internal combustion engine, the exhaust gas catalyst system including a main catalytic converter and at least one precatalyst with a catalyst carrier body formed of sheet metal layers coated with ceramic and catalytically active material and defining a multiplicity of channels through which a fluid can flow, the catalytically active material having a given response temperature, the method which comprises:
An apparatus for accelerating the response of an exhaust gas catalyst system downstream of an internal combustion engine, comprising a main catalytic converter and at least one electrically heatable precatalyst disposed upstream of said main catalytic converter as seen in the flow direction of the exhaust gas, said precatalyst including sheet-metal layers forming a plurality of channels through which the exhaust gas can flow, said sheet-metal layers having a thickness of substantially 0.03 to 0.06 mm, and electrical insulating means for electrically dividing said precatalyst and for forming at least one electric current path through said sheet-metal layers having an electric resistance of substantially between 0.2 and 2 .OMEGA..
Dependencies are inferred from the claim text.