| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an internal combustion engine, capable of preventing deterioration of a DPF due to extreme temperature rise, while reducing deterioration of fuel economy and oil dilution, by establishing optimum forcible regeneration conditions according to the deposit amount of PM. <P>SOLUTION: The forcible regeneration is started and a target regeneration temperature is raised according to a total deposit amount (S10 to S16), the temperature deviationΔT is calculated by subtracting the target regeneration temperature T2 in the step B from the practical regeneration temperature Tx during forcible regeneration processing (S18), the starting timing of the step B is delayed in the next time forcible regeneration and the forcible regeneration time is delayed in the step A assuming that extreme temperature rise occurs in the case in the temperature deviationΔT is a predetermined temperature deviation or more (S22 to S32). Further, the starting timing of the step B is accelerated of the next forcible regeneration time assuming that the extreme temperature rise does not occur and the forcible regeneration condition is switched so as to shorten the forcible regeneration time in the step A in the case the temperature deviationΔT is smaller than the predetermined temperature deviation (S34 to S36). <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
