Method and system for estimating a midbed temperature of a catalytic converter in an exhaust system having a variable length exhaust pipe
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United States of America Patent
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Nov 10, 1998
Issued Date -
N/A
app pub date -
Mar 27, 1997
filing date -
Oct 15, 1996
priority date (Note) -
Expired
status (Latency Note)
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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.
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