EXHAUST GAS PURIFICATION SYSTEM

Provided is an exhaust gas purification system with which DPF regeneration can be continued even when deceleration occurs during the DPF regeneration. The exhaust gas purification system includes a regeneration deceleration period intake/exhaust control unit 173 that, when a vehicle decelerates during the DPF regeneration, increases an exhaust gas flow rate through an exhaust pipe 103 by controlling respective openings of an EGR device 123 and an intake throttle 122 and adjusting a turbocharging amount of a high pressure stage turbocharger 108.