CONTROL METHOD FOR A HYDRAULIC TRANSMISSION OF AN AGRICULTURAL VEHICLE OR EARTH-MOVING MACHINE AND AGRICULTURAL VEHICLE OR EARTH-MOVING MACHINE IMPLEMENTING THE METHOD

Method for controlling a hydraulic transmission of an agricultural vehicle or of an earth-moving machine, in which the hydraulic transmission is of the series type, wherein a vehicle wheel (W) is connected to a hydraulic motor (HM) and wherein a variable displacement hydraulic pump (HP) is arranged to power said hydraulic motor, wherein the displacement is arranged to be controlled as a function of a rotation speed of a prime mover (E) connected to the hydraulic pump, wherein said function is manipulated in such a way as to include a first linear trend and a second linear trend, joined by means of an intermediate connection curve, defined in an interval of rotation speed (SI) of the prime mover having a lower end corresponding to the stop (STOP) of the vehicle from a dynamic condition and an upper end corresponding to the start (START) of the vehicle from a static condition, and wherein said joining curve identifies an increase in the hydraulic pump with a gradient greater than the first and second linear trends.