Patent ID: 8261532

Claim:
A fuel supply control method for an exhaust gas control apparatus for an internal combustion engine, comprising: operating a fuel supply portion that supplies fuel to a portion upstream of an exhaust gas control portion that purifies exhaust gas released from the internal combustion engine such that a cycle formed by combining a fuel supply period in which fuel is supplied from the fuel supply portion and a fuel supply stopped period in which fuel is not supplied is repeatedly performed, and controlling an arrangement of the fuel supply period and the fuel supply stopped period such that a temperature of the exhaust gas control portion at each of a starting point and an ending point of each cycle is equal to a target temperature, wherein the fuel supply period: i) comprises a plurality of fuel pulses, ii) begins at a first point in time when the temperature of the exhaust gas control portion is below the target temperature, and iii) ends at a second point in time, following the first point in time, when the temperature of the exhaust gas control portion is above the target temperature, wherein the temperature of the exhaust gas control portion continuously increases from the first point in time to the second point in time.