Method and system for controlling the temperature of an exhaust system

摘要

A method and system for controlling the temperature of an exhaust system having a variable length exhaust pipe (29) including a short path (29a) and a long path (29b) and an exhaust valve (31) positioned in the exhaust pipe (29) for regulating the flow of exhaust gas between the short path (29a) and the long path (29b) utilizes control logic for estimating a plurality of exhaust temperatures at various locations on the exhaust system. A plurality of maximum temperatures are also determined. The plurality of estimated exhaust temperatures are then compared with the plurality of maximum temperatures, and if a preselected number of the plurality of exhaust temperatures exceed the plurality of maximum temperatures, the exhaust valve (31) is controlled so that the exhaust gas flows through the long path (29b) of the exhaust pipe so as to aid in cooling the exhaust gas.