Exhaust gas purifier for internal combustion engine

摘要

It is an object of the present invention to effectively utilize the performance of an adsorbent by providing an art for controlling flow of exhaust gas to the adsorbent in accordance with a mode in which unburnt fuel components discharged from an internal combustion engine reach the adsorbent or a mode in which the unburnt fuel components adsorbed by the adsorbent are desorbed therefrom. An exhaust gas purifier for an internal combustion engine in accordance with the present invention includes an exhaust passage connected to the internal combustion engine and partially formed of a main exhaust passage and a bypass passage bypassing the main exhaust passage, an adsorbent disposed in the bypass passage, a flow passage switching unit for switching the flow of the exhaust passage to the main exhaust passage and the bypass passage, a reaching mode prediction unit for predicting a mode in which unburnt fuel components reach the adsorbent from the internal combustion engine, and a switching control unit for controlling the flow passage switching unit in accordance with the predicted mode.