Exhaust gas purification system

An exhaust gas purification system comprising:

• a DPF which is provided in an exhaust pipe of a diesel engine and which collects PM in exhaust gas;
• an exhaust pipe injector which is provided in the exhaust pipe upstream of the DPF and which performs exhaust pipe injection into the exhaust pipe;
• and
• a DPF regeneration control unit which performs temperature rise control of an exhaust gas temperature by the exhaust pipe injection to regenerate the DPF when the PM collected by the DPF 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, wherein
• the DPF regeneration control unit determines, during the regeneration, an injection amount of exhaust pipe injection that attains a predetermined temperature that is higher than the PM combustion temperature, and aborts the regeneration when a total amount of the exhaust pipe injection exceeds an exhaust pipe injection upper limit during the regeneration.