Method for controlling a steering system with two redundant power units

A method for controlling a steering system of a motor vehicle, including a first channel and a second channel which are disposed in parallel and each comprising an electric motorization delivering an assist force on the steering of the vehicle, in order to obtain a sum of the two delivered assist forces corresponding to a total requested assist force requirement, wherein the method comprises:

• a step of evaluating the channel having the lowest value of the power supply voltage of the motorization;
• a step of defining a master channel function delivering an initial part of the total assist force requirement and a slave channel function delivering a variable complementary part of an assist force, corresponding to the difference between an actually delivered force and the total force requirement;
• and a step of pairing the master channel function with the channel having the lowest value of the power supply voltage of the motorization, and the slave channel function with the channel having the highest value of the power supply of the motorization.