| 摘要 |
<p>PURPOSE:To prevent exhaust emission from being degraded when degradation degree is detected in the catalyst degradation detection device provided for the exhaust gas passage of an internal combustion engine. CONSTITUTION:An air fuel ratio sensor 18 is disposed at the downstream of a catalyst converter 11. A fuel-cut detecting means M1 detecting fuel-cut to an internal combustion engine 1, is provided. An air fuel ratio change-over means M2 is provided, which makes an air fuel ratio fuel rich when fuel supply is found by the fuel-cut detecting means M4 to have been suspended for a specified period of time. An O2 storage computing means M4 computes the oxygen adsorption capacity of the catalyst converter 11 based on the detected values of the air fuel ratio sensor 18 and a gas quantity detecting means M3. And a degradation degree detecting means M5 then detects the degradation degree of catalyst based on the oxygen quantity computed by the O2 storage computing means 9.</p> |
