Method and Apparatus for Calculating Effective Volume of Diesel Particulate Filter

A system for calculating an effective volume Ve 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(a4) is satisfied;
• means for detecting an exhaust flow amount Qexh of an exhaust gas if the learning condition of the ash coefficient δ(a4) is satisfied;
• means for calculating change of a pressure difference Δ(ΔPash(n)) of the exhaust gas caused by the ash;
• means for calculating change of the ash coefficient δ(a4) by using the change of the pressure difference Δ(ΔPash(n)) of the exhaust gas caused by the ash and the exhaust flow amount Qexh;
• means for calculating a current ash coefficient a4(n) by using the change of the ash coefficient δ(a4) and a previous ash coefficient a4(n-1);
• and
• means for determining the effective volume Ve of the diesel particulate filter by using the current ash coefficient a4(n) and a first filter coefficient a1.