| 摘要 |
A filter is arranged in an exhaust passage of an engine. The filter supports a catalyst. An accumulating amount estimating means detects differential pressure of the filter to estimate an amount of soot accumulating on the filter. An oxidizing condition detecting means detects an oxidizing condition of soot accumulating on the filter. A forcible oxidizing means increases temperature of the filter more than oxidizing temperature of soot for forcibly oxidizing soot accumulating in the vicinity of the catalyst of the filter. When the oxidizing condition detecting means detects a condition, in which soot accumulating on the filter is only partially oxidized, the accumulating amount estimating means estimates the amount of soot accumulating on the filter after oxidizing soot accumulating in the vicinity of the catalyst using the forcible oxidizing means.
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