Patent ID: 7131266

Claim:
A secondary air supply control apparatus for an internal combustion engine, comprising: a catalyst for purifying an exhaust gas, the catalyst being disposed in an exhaust passage of an internal combustion engine and; a secondary air supply mechanism for supplying secondary air into the exhaust passage at an upstream side of the catalyst; an air-fuel ratio detection unit for detecting an air-fuel ratio in the exhaust gas, the air-fuel ratio detection unit being disposed in the exhaust passage between the catalyst and a secondary air supply hole and for detecting an air-fuel ratio in the exhaust gas; and an air-fuel ratio feedback control unit for executing an air-fuel ratio feedback control to cause the air-fuel ratio detected by the air-fuel ratio detection unit to become coincident with a previously set target air-fuel ratio when a specified air-fuel ratio feedback control condition is established during supply of the secondary air provided by the secondary air supply mechanism, the target air-fuel ratio being set to a normal target air-fuel ratio in a first setting process executed by the air-fuel ratio feedback control unit when the secondary air is not supplied into the exhaust passage by the secondary air supply mechanism, and the target air-fuel ratio being set as said previously set target air-fuel ratio in a second setting process executed by the air-fuel ratio feedback control unit when the secondary air is being supplied into the exhaust passage by the secondary air supply mechanism.