DEVICE FOR DETECTING SULFUR COMPONENT

摘要

Disclosed is a device for detecting a sulfur component provided with a holding part for holding SOX and NOX in an exhaust gas passing through an exhaust gas channel, the NOX holding capability of which decreases with an increase in the SOX holding capability thereof, whereby the amount of held SOX is estimated based on the amount of NOX held in the holding part so that the integrated amount of SOX having passed said exhaust gas channel within a definite period of time or a value based on the integrated amount is detected. In this device for detecting a sulfur component, when NOX is not held in the holding part at such an NOX level that can be held at the present time, the estimation (step (105)) of the amount of held SOX based on the integrated amount of SOX or a value based on the integrated amount is inhibited (step (102)).