Road roller, speed control method and system thereof, controller and storage medium

The invention relates to a road roller, a speed control method and system thereof, a controller and a storage medium. The method comprises the following steps of setting a preset rotating speed value of an engine of the hydraulically-driven vibratory roller, and controlling the engine to operate at the preset rotating speed value of the engine; setting a running speed value of the road roller; determining the allowable maximum displacement value of a variable driving pump, determining the allowable maximum displacement value of a variable driving motor, and determining the threshold speed of the road roller; comparing the set driving speed value of the road roller with the threshold speed of the road roller; determining the maximum displacement of a variable driving pump and the displacement of a variable driving motor according to the comparison result of the set driving speed value of the road roller and the threshold speed of the road roller; all the variable driving motors being controlled to operate at t