Method for controlling a gear shift actuator and corresponding shift actuator

1. A method for controlling a shift actuator with a sliding gear for a gearbox of a vehicle, the gearbox comprising a control element for controlling a shift fork responsible for disengaging and engaging pinions on a shaft of the gearbox that receives torque from a traction machine powered by an on-board electrical system of the vehicle, the on-board electrical system including a low voltage battery, a high voltage battery, and a DC/DC converter, the control element being positioned upstream of a mechanical spring-assist system and regulated in position by a DC actuating motor, the method comprising:

providing a supply voltage to the actuating motor that is equal to a base voltage of the lower voltage battery; and

temporarily raising the supply voltage applied to the actuating motor above the base voltage during the disengaging and engaging the pinions.

2. The method for controlling a shift actuator as claimed in claim 1 , wherein the supply voltage of the actuating motor is increased during a cancellation the torque of the traction machine of the vehicle.

3. The method for controlling a shift actuator as claimed in claim 2 , wherein the increase in the supply voltage of the actuating motor is activated via the DC/DC converter (DC/DC).

4. The method for controlling a shift actuator as claimed in claim 2 , wherein the supply voltage of the actuating motor is increased at a level of a battery voltage supplying the traction machine of the vehicle.

5. The method for controlling a shift actuator as claimed in claim 2 , wherein the temporarily raising includes:

temporarily increasing a voltage setpoint applied by the on-board electrical system to the actuating motor during the cancellation of the torque of the traction machine of the vehicle;

disengaging the pinion transmitting the torque on a first gear;

synchronizing the gearbox shaft and the pinion used on a second gear;

engaging the second pinion;

returning the voltage setpoint to a basic setpoint on the on-board electrical system during reapplication of the torque of the traction machine.

6. The method for controlling a shift actuator as claimed in claim 1 , wherein the base voltage is 12V.

7. The method for controlling a shift actuator as claimed in claim 6 , wherein the supply voltage is raised to 16V during the temporarily raising.

8. The method for controlling a shift actuator as claimed in claim 1 , wherein the high voltage battery is configured to power the traction machine of the vehicle.