Apparatus for detecting the deterioration of a three-way catalyt

Details Apparatus for detecting the deterioration of a three-way catalyt Apparatus for detecting the deterioration of a three-way catalyt

1997-03-12

1999-03-30

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 731181, F01N 300

Patent

active

058874216

ABSTRACT:
The object of the present invention is to provide an apparatus for detecting the deterioration of a three-way catalytic converter which can accurately detect the deterioration degree. The present apparatus is furnished with an upstream A/F sensor installed at the upstream side of the converter and a downstream A/F sensor installed at the downstream side of the converter. The output of the upstream sensor is converted into the converted output for calculating the trajectory length. The trajectory length of the converted output and that of the output of the downstream sensor are respectively calculated, and the deterioration degree of the converter is detected based on these two trajectory lengths to avoid the misjudgment. The detecting accuracy can be better improved by compensating for the aberration of the balance between the oxygen absorbing power and the oxygen releasing power of the converter.

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patent: 5743086 (1998-04-01), Nagai

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