Process for electrical assistance to the braking of a vehicle and associated motor system

A process for electrical assistance to the braking of a vehicle with a motor system, wherein said motor system comprises at least one electric motor having an output shaft coupled to a primary shaft that drives at least one wheel of the vehicle, at least one wheel of said vehicle being equipped with a mechanical braking device that is activated by a hydraulic braking circuit, the process comprising collecting information in the hydraulic braking circuit of a primary braking circuit and in using said information as a set-point for a braking torque generated by the electric motor and exerted on the primary drive shaft of the wheels, the information collected in the hydraulic braking circuit being a measurement of pressure of the fluid that is contained in said circuit, said measurement of pressure being carried out by a pressure sensor in communication with an output of a device for pressurization of the hydraulic braking circuit, the measurement of pressure being transmitted to a controller of the electric motor in the form of an electrical signal of electrical voltage, and said signal being used by the controller for the calculation of a set-point for braking torque applied to the electric motor, wherein said set-point for electrical braking torque is proportional to the voltage that is obtained from the pressure sensor and wherein a proportionality factor between the output voltage of the pressure sensor and the set-point for the braking torque is parameterized in the controller of the electric motor, the electrical braking torque being applied to the wheels of the vehicle only when the electrical voltage of the signal from the pressure sensor exceeds a minimum voltage value.