Method and system for estimating a midbed temperature of a catal

Details Method and system for estimating a midbed temperature of a catal Method and system for estimating a midbed temperature of a catal

1997-03-27

1998-11-10

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60289, 60290, 60286, 364557, F01N 300

Patent

active

058327215

ABSTRACT:
A method and system for estimating the midbed temperature of a catalytic converter in an exhaust system of an internal combustion engine utilizes a sensor for a rotational speed of the engine and generating a corresponding speed signal. A control logic determines whether the exhaust gas is flowing through the short path or the long path, determines an instantaneous temperature of exhaust gas at a first point on the exhaust pipe based on the speed signal, and determines an instantaneous temperature at a midbed point of the catalytic converter based on the instantaneous temperature of exhaust gas at the first point on the exhaust pipe and which path the exhaust gas is flowing.

REFERENCES:
patent: 5414994 (1995-05-01), Cullen et al.
patent: 5610844 (1997-03-01), Maus et al.
patent: 5701735 (1997-12-01), Kawaguchi
patent: 5722236 (1998-03-01), Cullen et al.

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