Patent ID: 8544259

Claim:
An exhaust purification system of an internal combustion engine, the exhaust purification system comprising: an exhaust treatment device arranged in an engine exhaust passage which purifies exhaust, a fuel feed device arranged at an upstream side from the exhaust treatment device, and which feeds fuel to the engine exhaust passage, an ignition device which causes fuel, which is fed from the fuel feed device, to ignite, and a flow regulating device which regulates a flow rate of exhaust gas which flows toward the ignition device, wherein the fuel feed device is formed so as to feed liquid fuel, the system has an operating region in which due to the fuel which is fed to the engine exhaust passage burning, backflow of the exhaust gas occurs, fuel is made to burn in the operating region in which backflow of the exhaust gas occurs and further control is performed to make the flow rate of the exhaust gas increase during a period from when combustion of fuel should be started to when combustion of the fuel ends.