| 摘要 |
<P>PROBLEM TO BE SOLVED: To further accurately determine the deterioration in a catalyst, by determining an adsorption-desorption performance state and a catalyst activation state of an unburnt component, in an exhaust emission control device of an internal combustion engine. <P>SOLUTION: A control means 16 has a first determining means 16A for determining whether or not to be longer than a first preset value in elapsed time until the temperature detected by a first temperature detecting means 13 exceeds the desorption starting temperature of the unburnt component adsorbed to a catalyst, by starting measurement from starting completing time of the internal combustion engine 1, in cold starting of the internal combustion engine 1, a second determining means 16B for determining whether or not to be longer than a second preset value in a period until the temperature detected by a second temperature detecting means 14 reaches the complete activation temperature by exceeding the desorption starting temperature, when determining that the elapsed time is the first preset value or less by the first determining means 16A, and a warning signal generating means 16C for generating a signal of the fact that the catalyst is deteriorated, when determined that the period is longer than the second preset value by the second determining means 16B. <P>COPYRIGHT: (C)2010,JPO&INPIT |
