Patent ID: 7624571

Claim:
An exhaust gas purifying apparatus for an internal combustion engine, said apparatus comprising: a collector that collects exhaust particles in exhaust gas discharged from the internal combustion engine, said exhaust gas containing plural constituent components; a gas component computing means for computing an amount of a predetermined subset of at least one of said gas components in the exhaust gas, which passes through the collector; and a collected amount computing means for computing a collected amount of the exhaust particles prior to regeneration based on (a) a pressure difference across the collector, (b) a temperature of the exhaust gas, which passes through the collector, and (c) the amount of the predetermined gas component computed by the gas component computing means, wherein the exhaust gas purifying apparatus initiates regeneration of the collector by burning the exhaust particles collected in the collector when the collected amount computed by the collected amount computing means reaches a predetermined value as determined based on (a) pressure difference across the collector, (b) a temperature of the exhaust gas, which passes through the collector, and (c) the amount of the predetermined gas component computed by the gas component computing means.