CATALYST MONITORING SYSTEM AND CATALYST MONITORING METHOD
摘要
<p>The concentration of a portion of components in the hydrocarbon in exhaust gas flowing into a catalyst is detected or estimated, and the concentration of the portion of components in the hydrocarbon in the exhaust gas flowing out of the catalyst is detected. On the basis of the concentrations of the portion of components in the hydrocarbon flowing into the catalyst and the concentration of the portion of components in the hydrocarbon flowing out of the catalyst, it is determined whether or not the catalyst has been deteriorated.</p>