Diagnosis of deterioration in air/fuel ratio sensor

Details Diagnosis of deterioration in air/fuel ratio sensor Diagnosis of deterioration in air/fuel ratio sensor

2005-06-07

2005-06-07

Nguyen, Tu M. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Methods

C060S276000, C060S277000, C060S285000, C073S023320, C123S19800E, C123S481000

Reexamination Certificate

active

06901741

ABSTRACT:
An air/fuel ratio sensor (4) and a three-way catalytic converter (3A) having an oxygen storage function are provided in an exhaust passage (2) of an internal combustion engine (1). A controller (6) runs the engine (1) under the alternating application of a stoichiometric air/fuel ratio and a rich air/fuel ratio, and a diagnosis of deterioration in the air/fuel ratio sensor (4) is performed on the basis of the amplitude of variation in the air/fuel ratio detected by the air/fuel ratio sensor (4). By executing the diagnosis only immediately after a fuel cut, the amount of oxygen stored in the three-way catalytic converter (3A) at the start point of the diagnosis is equal to the maximum amount. When the rich air/fuel ratio is applied, the converter (3A) releases the stored oxygen to maintain the exhaust gas purification performance of the converter (13).

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patent: 8-285808 (1996-11-01), None
patent: WO 01/61165 (2001-08-01), None

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