Patent ID: 7603252

Claim:
A system for calculating an effective volume V e of a diesel particulate filter, comprising: means for determining whether regeneration efficiency exists after soot is regenerated; means for determining, if the regeneration efficiency exists, whether a learning condition of an ash coefficient δ(a 4 ) is satisfied; means for detecting an exhaust flow amount Q exh of an exhaust gas if the learning condition of the ash coefficient δ(a 4 ) is satisfied; means for calculating change of a pressure difference Δ(ΔP ash(n) ) of the exhaust gas caused by the ash; means for calculating change of the ash coefficient δ(a 4 ) by using the change of the pressure difference Δ(ΔP ash(n) ) of the exhaust gas caused by the ash and the exhaust flow amount Q ash ; means for calculating a current ash coefficient a 4(n) by using the change of the ash coefficient δ(a 4 ) and a previous ash coefficient a 4(n-1) ; and means for determining the effective volume V e of the diesel particulate filter by using the current ash coefficient a 4(n) and a first filter coefficient a 1 .