Method for controlling a delivery of driving torque of a combustion engine of an agricultural tractor

A method for controlling a delivery of driving torque of a combustion engine of an agricultural tractor comprising:

• a first step (Step 1) of monitoring a speed of said engine;
• a second step (Step 2) of determining whether said speed is stable around a stable speed value (Sp) of the engine by comparison of said speed or a value derived therefrom to a predefined threshold;
• and
• a third automatic step of maintaining it stable by compensating (Step 3) a load variation applied to the engine in response to a determination that said speed is stable in Step 2, said compensating comprising generating a modified torque curve starting from a rated torque curve shifting it upwards for only negative speed values—left-hand branch—with respect to said stable speed value (Sp) of the engine and/or shifting it downwards for only positive speed values—right-hand branch—with respect to said stable speed value (Sp) of the engine, said modified torque curve spaced from the rated torque curve by a distance (G), wherein, thereafter, as the engine speed moves above the stable speed value (Sp), the delivery of driving torque follows the right-hand branch of the modified torque curve, and as the engine speed moves below the stable speed value (Sp), the delivery of driving torque follows the left-hand branch of the modified torque curve.