Exhaust gas purification system for internal combustion engine

An object of the present invention is a function of the exhaust purification apparatus provided in an exhaust passage of an internal combustion engine for the purpose of more surely restoring. The present invention was heated to an exhaust purification device by supplying a reducing agent to the front end catalyst, it recovery control executing means for executing a recovery control to restore the function of the exhaust purification apparatus by and, the execution of the recovery control of the recovery control executing means and a forbidden area setting means for setting the operating range of the recovery control prohibition region of the internal combustion engine is prohibited. And the higher the degree of deterioration of the front catalyst, and sets the maximum value of the engine torque and the engine speed of the recovery control prohibition region to a higher value.The exhaust emission control device, the fuel addition valve, NOx catalyst, the internal combustion engine, ECU