EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

Provided is an exhaust emission control device for an internal combustion engine in which separation of predetermined components contained in an exhaust gas from an adsorbing means for adsorbing the components and purification of the separated components can be efficiently realized even when the internal combustion engine is stopped. The exhaust emission control device comprises a main exhaust passage (42) and a bypass passage (46) bypassing the main exhaust passage (42). The exhaust emission control device further comprises an exhaust selector valve (50) capable of changing the part into which the exhaust gas flows between the main exhaust passage (42) and the bypass passage (46). An adsorbent (52) for adsorbing predetermined components contained in the exhaust gas is provided in the bypass passage (46). An under-floor catalyst (56) containing a catalyst with electric heater (EHC)(58) is installed in the main exhaust passage (42) on further downstream side than the bypass passage (46). A pump (68) and a heater (70) are provided in an atmosphere supply passage (66) branched from the bypass passage (46) on the upstream side of the adsorbent (52).