Method for controlling engine exhaust gas system

Details Method for controlling engine exhaust gas system Method for controlling engine exhaust gas system

1997-06-16

2000-01-11

Denion, Thomas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60277, 60276, 60285, 123688, F01N 300

Patent

active

06012282&

ABSTRACT:
A method for controlling an engine exhaust gas system includes the steps of detecting an air-fuel ratio of exhaust gas discharged from an internal engine by an oxygen sensor, controlling the exhaust gas to near the stoichiometric air-fuel ratio by a closed-loop control referring to a resultant signal, and leading the exhaust gas to a three-way catalyst to treat nitrogen oxide, hydrocarbon and carbon monoxide. A nitrogen oxide sensor is provided downstream of the three-way catalyst, and a control value of air-fuel ratio by a closed loop control by the oxygen sensor is corrected to set the nitrogen oxide concentration to a predetermined value in accordance with an output of the nitrogen oxide sensor. The deterioration of the three-way catalyst and/or oxygen sensor is detected by comparing a change in control corrected value for the air-fuel ratio of closed loop control referring to an output of the nitrogen oxide sensor with a predetermined value.

REFERENCES:
patent: 4927517 (1990-05-01), Mizutani et al.
patent: 5444974 (1995-08-01), Beck et al.
patent: 5452576 (1995-09-01), Hamburg et al.
patent: 5643429 (1997-07-01), Wachsman

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