Patent ID: 8240131

Claim:
An exhaust gas purifying apparatus for an internal combustion engine that uses control for providing a stoichiometric air fuel ratio as basic control for an air fuel ratio, the apparatus comprising: a particulate filter that is disposed in an exhaust passage of the internal combustion engine and traps particulate matter contained in exhaust gas; an upstream side three-way catalyst that is disposed in the exhaust passage at an upstream side of the particulate filter; a downstream side three-way catalyst that is disposed in the exhaust passage at a downstream side of the particulate filter and has an oxygen storage capacity; an air fuel ratio sensor that is disposed in the exhaust passage at a downstream side of the downstream side three-way catalyst to obtain information on an air fuel ratio of the exhaust gas; and feedback means for correcting a fuel injection amount on the basis of outputs of the air fuel ratio sensor; wherein the upstream side three-way catalyst has no oxygen storage capacity; and wherein the downstream side three-way catalyst is a catalyst which an amount of oxygen supplied thereto is adjusted by the feedback means.