Exhaust purifying apparatus for internal combustion engine

An exhaust purifying apparatus for an internal combustion engine, comprising:

• an exhaust purifying mechanism that is located in an exhaust passage of the internal combustion engine, wherein the exhaust purifying mechanism traps particulate matter in exhaust gas;
• a fuel adding device for adding fuel to exhaust gas that passes through the exhaust purifying mechanism;
• a detecting section that detects a pressure difference between a section upstream and a section downstream of the exhaust purifying mechanism;
• a comparing section, wherein, while the fuel adding device is adding fuel to exhaust gas, the comparing section compares the pressure difference that is detected by the detecting section at a predetermined point in time with the pressure difference reference value that has been set in correspondence with the predetermined point in time;
• and
• a setting section, wherein, when the comparing section determines that the pressure difference exceeds the pressure difference reference value, the setting section sets the manner of adding fuel of the fuel adding device to intermittent fuel addition.