Patent ID: 8881511

Claim:
A method for controlling a system intended to reduce an amount of NOx in exhaust gases of a motor vehicle, the system comprising on-board the motor vehicle: a storage chamber ( 8 ) containing a pollutant-removing agent; a heating device ( 9 ) arranged to control a temperature of the storage chamber ( 8 ); a feed module ( 6 ) arranged to inject the pollutant-removing agent into the exhaust gases, and comprising: a device ( 6 a ) for measuring pressure or temperature inside the storage chamber ( 8 ); and a device ( 6 b ) for proportioning the pollutant-removing agent; the method comprising the following steps: a) calculating, when the motor vehicle is in operation and for a predetermined driving period, a set pressure or temperature inside the storage chamber ( 8 ) according to one or more parameters of the motor vehicle which are a function of a type of driving of said motor vehicle during said predetermined driving period; b) comparing the set pressure or temperature with the pressure or temperature measured by the pressure or temperature measuring device ( 6 a ) during operation of the motor vehicle, after said predetermined driving period; and c) heating the storage chamber ( 8 ) if the pressure or temperature therein is lower than the set pressure or temperature.