Patent attributes
An exhaust gas purifying apparatus for an internal combustion engine includes a collector, which collects exhaust particles in exhaust gas. The apparatus computes a pressure-difference-based measured value of a collected amount of the particles based on a pressure difference, and computes a pressure-difference-based estimated value by correcting the measured value. The apparatus computes an operational-state-based estimated value of the collected amount. The apparatus regenerates the collector by burning the exhaust particles when one of the pressure-difference-based estimated value and the operational-state-based estimated value reaches a predetermined value. The apparatus computes a current pressure-difference-based estimated value by correcting a current pressure-difference-based measured value based on information related to an immediately preceding operational-state-based computing period such that the current pressure-difference-based estimated value ranges from the current measured value to a previous pressure-difference-based estimated value.
