Method for securing a setpoint torque for a motor of a power steering system

A method for securing a setpoint torque for a motor, said motor exerting a motor torque on a device of a power steering system of a vehicle so as to modify an angular position of said device, the method being executed by at least one controller and comprising:

• A first determination step in which at least one first intermediate value of the setpoint torque is determined as a function of at least one parameter representing a setpoint angular position of the device and of at least one parameter representative of the angular position of the device;
• A second determination step in which a limit value of the at least one first intermediate value of the setpoint torque is determined as a function of at least the parameter representing the setpoint angular position and at least the parameter representing the angular position;
• A third determination step in which a parameter representing the average motor torque exerted at a previous instant is determined;
• A first evaluation step in which a temporary value of the setpoint torque is evaluated as a function of the at least one first intermediate value of the setpoint torque and of the parameter representing the average motor torque exerted at the previous instant;
• A second evaluation step in which a limit value of the temporary value of the setpoint torque is determined as a function of the limit value of the at least one first intermediate value of the setpoint torque and of the parameter representing the average motor torque exerted at the previous instant;
• A securing step in which a target value of the setpoint torque is determined as a function of at least the temporary value of the setpoint torque and the limit value of the temporary value of the setpoint torque.