Exhaust gas purifying apparatus for internal combustion engine

An exhaust gas purifying apparatus for an internal combustion engine for purifying exhaust gases discharged from said internal combustion engine, and temporarily adsorbing hydrocarbons within exhaust gases upon start of said internal combustion engine, said exhaust gas purifying apparatus comprising:

• a catalyzer disposed in an exhaust system of said internal combustion engine for purifying exhaust gases;
• an adsorbent filled in a second passage in said exhaust system for adsorbing hydrocarbons within exhaust gases, said second passage circumventing a first passage;
• a switching valve operable to switch between an open position for opening said first passage and a close position for closing said first passage;
• start-time temperature state detecting means for detecting a temperature state of said exhaust system upon start of said internal combustion engine;
• post-start exhaust gas calory calculating means for calculating the calory of exhaust gases discharged after the start of said internal combustion engine;
• and
• switching valve driving means for driving said switching valve to said close position upon start of said internal combustion engine, and for driving said switching valve to said open position in accordance with the detected start-time temperature state of said exhaust system, and the calculated post-start exhaust gas calory.