CONTROL OF REGENERATION OF A PARTICULATE FILTER OF EXHAUST GAS

摘要

An exhaust gas purification apparatus of an internal combustion engine is provided with a filter that collects PM in exhaust gas, a first accumulation amount obtaining unit that obtains an accumulation amount of PM (Mpm at S201), a second accumulation amount obtaining unit that obtains an accumulation amount of ash (Mash at S201) and a control unit that executes a regeneration process to oxidize the accumulated PM, wherein, in a case (at S202) where the accumulation amount of ash (Mash) is equal to or larger than a threshold amount (Ma), the control unit executes the regeneration process provided (at S401) the accumulation amount of PM (Mpm) is in a state where it has reached a first predetermined amount (Mpmt of S206) which is an amount to raise a filter temperature (current temperature Tc) to a temperature (target temperature Tt) by oxidation heat generated by the regeneration process, the temperature (Tt) being a temperature at which the accumulated ash contracts, i.e. the incombustible matter increases density and decreases volume at >750-1050°C in order to reduce back pressure of the filter.