Catalyst deterioration detecting apparatus and method

Details Catalyst deterioration detecting apparatus and method Catalyst deterioration detecting apparatus and method

2007-04-03

2007-04-03

Soderquist, Arlen (Department: 1743)

Chemistry: analytical and immunological testing

Testing of catalyst

C060S276000, C060S277000, C422S098000, C422S108000, C436S137000, C436S155000, C436S159000, C436S181000

Reexamination Certificate

active

10193900

ABSTRACT:
An upstream side catalyst and a downstream side catalyst are disposed in an exhaust passage. A first oxygen sensor is disposed between these two catalysts and a second oxygen sensor is disposed downstream of the downstream side catalyst. The air-fuel ratio is forcibly oscillated and the oxygen storage capacity of the upstream side catalyst is detected. Deterioration of the upstream side catalyst is then detected based on whether this oxygen storage capacity is larger than a predetermined value. The forced oscillation of the air-fuel ratio is performed only when the oxygen storage state of the downstream side catalyst is appropriate.

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