EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine to completely purify HC even when a moisture content absorbing amount is low and HC is rapidly separated. SOLUTION: An exhaust emission control device for an internal combustion engine comprises a main catalyst arranged in a main passage for exhaust gas from an engine: a bypass passage branched from the main passage for exhaust gas: and a control unit to control a bypass switching valve and a heater for a catalyst with a heater according to the active state of an adsorbent, a catalyst with a heater, and a main catalyst. The exhaust emission control device comprises a moisture content estimating means (a) formed such that an amount of adsorbed moisture content is estimated when HC in exhaust gas is adsorbed by the adsorbent; and a separation processing control means (b) formed such that separation processing for the adsorbent is effected based on the estimating result of the moisture adsorbing amount estimating means.