VARIABLE POSITION CATALYST

摘要

A variable position catalyst comprises a catalyst housing (7) accommodating a catalyst body (1) and an actuator member (9) for moving the catalyst body (1) with respect to the catalyst housing (7) such that the catalyst body (1) can be moved to an active catalyst position (35) or to an inactive catalyst position (14). The variable position catalyst is incorporated in the exhaust line of an internal combustion engine upstream of a turbocharger. The variable position catalyst can be controlled such that the catalyst body (1) is moved to the active catalyst position (35) when the engine is in a predetermined first operation state, and the catalyst body is moved to the inactive catalyst position (14) when the engine is in a predetermined second operation state.