| 摘要 |
A catalyst deterioration detecting apparatus for an internal combustion engine which can ensure an enhanced reliability for catalyst deterioration decision by reflecting accurately a parameter value indicative of engine load in a counter value and by detecting positively temperature rise state of catalyst. The apparatus includes an engine load detecting means (31) for determining arithmetically parameter values corresponding to load states of the engine (1), an accumulating means (32, 32B) for determining arithmetically an accumulated value (SIGMAQ) by adding accumulatively counter values corresponding to the parameter values (Qa), a first comparison means (33) for comparing the accumulated value (SIGMAQ) with a first predetermined value (alpha) corresponding to an operation temperature of a catalytic converter (10), and a catalyst deterioration decision means (102) for making decision as to deterioration of the catalytic converter (10) when the accumulated value (SIGMAQ) attains or exceeds the first predetermined value (alpha).
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