EXHAUST GAS PURIFICATION SYSTEM

Provided is an exhaust gas purification system which is capable of appropriately aborting DPF regeneration to suppress a decline in gas mileage in a vehicle condition where temperature rise control of exhaust gas becomes unstable when the DPF regeneration is performed using exhaust pipe injection. The exhaust gas purification system includes a DPF 25 which collects PM in exhaust gas, an exhaust pipe injector 38 which performs exhaust pipe injection, and a DPF regeneration control unit 100 which performs temperature rise control of an exhaust gas temperature by the exhaust pipe injection to regenerate the DPF 25 when the PM collected by the DPF 25 exceeds a fixed amount and which, during the regeneration, integrates an amount of time during which the exhaust gas temperature exceeds a PM combustion temperature and completes the regeneration when an integrated value thereof reaches a set regeneration completion value. The DPF regeneration control unit 100 aborts the regeneration when, during the regeneration, a total amount of the exhaust pipe injection exceeds an exhaust pipe injection upper limit before the integrated value of the amount of time during which the exhaust gas temperature exceeds the PM combustion temperature reaches the set regeneration completion value.