Patent ID: 8789359

Claim:
An exhaust purification system of an internal combustion engine, comprising: an exhaust purification catalyst provided in an exhaust passage of the internal combustion engine in a vehicle; a fuel supply device which is provided in the exhaust passage upstream the exhaust purification catalyst and supplies fuel to an exhaust gas flowing into the exhaust purification catalyst; a heating device which heats the fuel supplied from the fuel supply device; and a controller which controls the heating device, wherein the controller controls the heating device to a pre-heating temperature lower than an ignition threshold value capable of igniting the fuel by supplying power to the heating device without performing fuel supply by the fuel supply device when a first processing request which stands if a state of the exhaust purification catalyst requires combustion of the fuel is standing and a second processing request which stands if an operating state of the vehicle allows exhaust oxygen concentration suitable for combustion of the fuel to be supplied is not standing, and controls the heating device to an ignition temperature higher than the ignition threshold value when the first processing request and the second processing request are standing and controls the fuel supply device so that the fuel is supplied on condition that the heating device has reached the ignition temperature.