Importance

Loading Importance Indicators...

Abstract

In an exhaust gas cleaning apparatus (30) in which a before and after differential pressure (.DELTA.P) of a filter (32) used to trap particulates is detected for regeneration of the filter (32), a time at which, during filter regeneration, the temperature of the outlet section of the filter (32) falls below the temperature of the inlet section thereof (.DELTA.T>M), using a first temperature sensor (36) and a second temperature sensor (37), is determined as being the timing of the completion of the regeneration of the filter (32). The value of the before and after differential pressure (.DELTA.P) at the time of this regeneration completion is used to estimate the quantity of residual ash in the filter (32), and when this estimated residual ash quantity is the same as, or greater than, a prescribed value (PX), a replacement warning signal (K3) is output urging replacement of the filter (32).

Loading the Abstract Image...

First Claim