Patent ID: 7614219
Filing Date: 2009-11-10
Classification: F01N,Y02T

Abstract:
1. An exhaust gas purifying apparatus for an internal combustion engine, which is mounted on a vehicle, comprising: a collector that collects exhaust particles in exhaust gas discharged from the internal combustion engine; a pressure-difference-based computing means for computing a pressure-difference-based measured value of a collected amount of the exhaust particles in the collector based on a pressure difference across the collector, wherein the pressure-difference-based computing means includes a correcting means for computing a pressure-difference-based estimated value of the collected amount by correcting the pressure-difference-based measured value of the collected amount; and an operational-state-based computing means for computing an operational-state-based increase of the collected amount of the exhaust particles in the collector based on an operational state of the internal combustion engine, and for computing an operational-state-based estimated value of the collected amount by adding the operational-state-based increase of the collected amount to the pressure-difference-based estimated value of the collected amount computed latest by the pressure-difference-based computing means, wherein: the exhaust gas purifying apparatus switches the pressure-difference-based computing means and the operational-state-based computing means based on a predetermined operational condition; and the exhaust gas purifying apparatus regenerates the collector by burning the exhaust particles collected in the collector when one of the pressure-difference-based estimated value of the collected amount and the operational-state-based estimated value of the collected amount reaches a predetermined value; and the correcting means computes a current pressure-difference-based estimated value by correcting a current pressure-difference-based measured value of the collected amount based on information related to an immediately preceding operational-state-based computing period, where the operational-state-based computing means computes the collected amount, such that the current pressure-difference-based estimated value ranges from the current pressure-difference-based measured value to a previous pressure-difference-based estimated value, which is computed previously of the current pressure-difference-based estimated value.