EXHAUST AIR PURIFIER EQUIPMENT AND METHOD FOR PURIFYING EXHAUST AIR

摘要

An exhaust gas pressure P, exhaust gas temperatures T U and T D on upstream and downstream of a DPF, a rotation speed Ne, a load Q, and an intake flow rate F as various operating conditions are read, and an amount of PM generated for short time ”t is obtained to be added to a PM deposited amount m, and thus, to obtain an initial deposited amount. Exhaust gas properties and a space velocity SV are obtained based on various operating conditions, and the PM deposited amount m after a lapse of the short time ”t is estimated from a PM deposited amount estimation equation "m = m·exp (-B·”t)" having been derived considering the exhaust gas properties and the space velocity SV. When the PM deposited amount m is equal to or more than a predetermined value, a forced regeneration processing in the DPF is executed, and thereafter, the PM deposited amount m is reset to 0.