Patent ID: 8276369

Claim:
An exhaust purification system of an internal combustion engine comprising: an NOx storage/reduction catalyst device; a particulate filter arranged downstream of said NOx storage reduction catalyst device; and a sulfur trap device is arranged upstream of said NOx storage/reduction catalyst device, wherein a first fuel supplying device which supplies additional fuel for a regeneration treatment of said particulate filter to the exhaust system upstream of said sulfur trap device or into a cylinder is provided, a first amount of said additional fuel supplied by said first fuel supplying device is controlled to make said sulfur trap device not release SOx, and a second fuel supplying device, provided in the exhaust system between said NOx storage/reduction catalyst device and said particulate filter, which supplies a second amount of additional fuel to said first amount of said additional fuel supplied by said first fuel supplying device in the regeneration treatment of said particulate filter if said first amount of said additional fuel is insufficient for the regeneration treatment of said particulate filter.