Exhaust emission control system for internal combustion engine

Details Exhaust emission control system for internal combustion engine Exhaust emission control system for internal combustion engine

2005-01-04

2005-01-04

Hoff, Marc S. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Chemical analysis

C702S032000, C702S100000, C702S179000, C060S276000, C060S285000, C180S309000, C477S100000, C700S052000, C700S071000

Reexamination Certificate

active

06839637

ABSTRACT:
An exhaust emission control system for an internal combustion engine is disclosed. The system includes a NOx removing device provided in an exhaust system of the engine for removing NOx contained in exhaust gases, and an oxygen concentration sensor provided in the exhaust system. The air-fuel ratio of the air-fuel mixture to be supplied to the engine is changed from a value which is leaner than the stoichiometric ratio to a value which is richer than the stoichiometric ratio. It is determined whether or not a sulfur oxide concentration in the exhaust gases is high according to a transient characteristic of an oxygen concentration detected by the oxygen concentration sensor after the air-fuel ratio is changed.

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