Method for managing a gear shift in a gearbox

A control method for managing an upshift in a gearbox of a movable vehicle having an engine, the shift being intended to transition from a starting gear to a target gear,

• wherein the gearbox comprises a selection shaft (1) movable between a first stable position (θ1) corresponding to the starting gear and a second stable position (θ2) corresponding to the target gear,
• wherein the gearbox comprises an angular position sensor (2) for the selection shaft providing a voltage value (61) corresponding to a current angular position of the selection shaft, the method comprising:
• an acquisition step, in which the voltage value corresponding to the angular position of the selection shaft is acquired iteratively;
• an engine torque reduction step, in which, when, starting from a first reference value (V1) corresponding to the first stable position (θ1) of the selection shaft, the current voltage value increases and becomes greater than a first predetermined threshold (VS1), then a reduction in the engine torque is triggered, with the first predetermined threshold (VS1) exceeding the first reference value (V1) by a first difference (E1);
• an engine torque restoration step, in which, when the current voltage value increases and becomes greater than a second predetermined threshold (VS2), then the engine torque reduction is cancelled and the requested engine torque is applied;
• with the second predetermined threshold (VS2) being separated by a second difference (E2) and being below a second reference value (V2) corresponding to the second stable position (θ2) of the selection shaft;
• wherein the first difference (E1) ranges between 5% and 15% of the difference between the second reference value (V2) and the first reference value (V1).