Exhaust gas purification system having particulate filter

An exhaust gas purification system of an internal combustion engine, the exhaust gas purification system comprising:

• a particulate filter disposed in an exhaust pipe of the engine for trapping particulate matters included in exhaust gas;
• and
• regeneration controlling means for measuring a quantity of the particulate matters trapped by the particulate filter and for regenerating the particulate filter based on the calculated quantity of the trapped particulate matters,
• wherein the regeneration controlling means has temperature controlling means for heating the particulate filter at least to a predetermined temperature at which a soluble organic fraction included in the particulate matters can be eliminated, and trapped quantity measuring means for measuring a quantity of the trapped particulate matters based on a pressure loss generated in the particulate filter after the particulate filter is heated at least to the predetermined temperature.