Drive System for a Harvester

A harvester comprising: a drive engine connected via a first drive train to ground engagement equipment of the harvester and via a second drive train to crop processing equipment of the harvester; an actuator configured to adjust the transmission ratio of the first drive train to control the propulsion speed of the harvester; and a controller configured to receive setpoint and actual values dependent on the crop throughput of the harvester, the controller configured to calculate an acceleration signal based on the setpoint and actual values, the acceleration signal representing an acceleration of the harvester suitable for minimizing the difference between the setpoint and actual values, and to determine a control signal for controlling the actuator based on the acceleration signal.