| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine, capable of detecting the abnormality of air fuel ratio sensors without increasing emission. <P>SOLUTION: The exhaust emission control device for the internal combustion engine 10 includes an adsorption catalyst 40 provided in the exhaust passage 20 of the internal combustion engine 10 and O<SB>2</SB>sensors 60A, 60B each provided at least downstream of the adsorption catalyst 40 in the exhaust passage 20 and serving as the air fuel ratio sensor having a built-in heater. Before start of the internal combustion engine 10, the heaters are operated to activate the O<SB>2</SB>sensors 60A, 60B, and based on the detection signals of the O<SB>2</SB>sensors 60A, 60B with respect to the exhaust gas at start of the internal combustion engine 10, the abnormality of the O<SB>2</SB>sensors 60A, 60B is detected. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
