Method for analysing the operation of an anti-pollution system for a motor vehicle

A method for analyzing a functioning of an anti-pollution system of a motor vehicle (1) with a combustion engine, said motor vehicle (1) equipped with a measurement sensor (110) that measures a parameter of the motor vehicle (1) and an analytical computation means (140) connected to said measurement sensor (110), said method comprising:

• measuring, by the measurement sensor (110), at least one parameter of the motor vehicle (1);
• generating (E20), by the measurement sensor (110), a numerical data item representative of the measured value of the parameter;
• transmitting, by the measurement sensor (110), said numerical data item to the analytical computation means (140), the transmitting being effected over a direct communication link (L1) between the measurement sensor (110) and the analytical computation means (140);
• comparing (E30), by the analytical computation means (140), said numerical data item against a predetermined range of values defined by an upper boundary and a lower boundary, said predetermined range of values being representative of the functioning of the anti-pollution system in accordance with a predetermined standard;
• and
• storing (E40) the numerical data item in a memory zone of the analytical computation means only when said numerical data item satisfies any of the following two conditions:
• i) said numerical data item is less than the lower boundary of said predetermined range of values,
• ii) said numerical data item is greater than the higher boundary of said predetermined range of values,
• wherein the stored numerical data item being less than the lower boundary of said predetermined range of values indicates that the anti-pollution system has suffered a deterioration, and the stored numerical data item being greater than the upper boundary of said predetermined range of values indicates that the numerical data item has been falsified.