| 摘要 |
A catalyst deterioration-determining device for an internal combustion engine, in which a temperature sensor for detecting the temperature of a catalyst body is eliminated, but high-precision determination can be made to the deterioration of the catalyst body. To this end, a control unit determines, on the basis of a warm-up counter used for a catalyst body, whether or not the catalyst body is in a predetermined warm-up state. The warm-up counter reckons in relation to any engine load of an internal combustion engine. If the catalyst body is found to be in the predetermined warm-up state according to the above determination, the control unit determines whether or not deterioration-determining conditions for the catalyst body have been fulfilled.
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