Method and system for controlling the temperature of an exhaust

Details Method and system for controlling the temperature of an exhaust Method and system for controlling the temperature of an exhaust

1997-03-28

1999-01-05

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60289, 60290, 60286, 364557, F01N 300

Patent

active

058551131

ABSTRACT:
A method and system for controlling the temperature of an exhaust system having a variable length exhaust pipe including a short path and a long path and an exhaust valve positioned in the exhaust pipe for regulating the flow of exhaust gas between the short path and the long path 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 is controlled so that the exhaust gas flows through the long path of the exhaust pipe so as to aid in cooling the exhaust gas.

REFERENCES:
patent: 3957444 (1976-05-01), Goto et al.
patent: 5414994 (1995-05-01), Cullen et al.
patent: 5606855 (1997-03-01), Tomisawa
patent: 5610844 (1997-03-01), Maus et al.
patent: 5613359 (1997-03-01), Zahn et al.
patent: 5701735 (1997-12-01), Kawaguchi
patent: 5722236 (1998-03-01), Cullen et al.

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