Method and system for estimating temperature of a heated exhaust

Details Method and system for estimating temperature of a heated exhaust Method and system for estimating temperature of a heated exhaust

1997-06-30

1999-05-11

Verdier, Christopher

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60287, 123697, F01N3/00

Patent

active

059015535

ABSTRACT:
A method for estimating a temperature of a tip of an exhaust gas oxygen (EGO) sensor used with a heater in an electronic engine control for an engine having an exhaust system wherein the exhaust system includes a variable length exhaust pipe having a short path and a long path for transporting exhaust gas from the engine to the HEGO sensor 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 to determine whether the exhaust gas is flowing through the short path or the long path, determine a temperature of the unheated HEGO sensor based on the path of flow of the exhaust gas, and determine whether the heater is on. If the heater is not on, an amount of heat applied to the sensor is set to zero. If the heater is on, an increase in the temperature of the HEGO sensor is determined based on an amount of heat applied to the sensor. The control logic then determines the temperature of the heated HEGO sensor based on the temperature of the unheated HEGO sensor and the increase in the temperature.

REFERENCES:
patent: 5414994 (1995-05-01), Cullen et al.
patent: 5497655 (1996-03-01), Gee et al.
patent: 5505183 (1996-04-01), Sinha et al.
patent: 5669219 (1997-09-01), Schnaibel et al.
patent: 5832721 (1998-11-01), Cullen

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