Self-propelled vehicle with control elements for regulating engine speed, vehicle ground speed and power take-off (PTO) speed

A device (AC) for controlling the operating conditions of a self-propelled vehicle. The device (AC) including a first device (D1) for controlling the travelling speed of the self-propelled vehicle, and a second device (D2) for controlling the output speed of an internal combustion engine (2); the first and second devices (D1, D2) being separate from each other.