Engine power control system for a combine harvester having an engine, wherein the engine power control system comprises a fuel system with adjustment means which set the rate with which fuel is output to combustion chambers of the engine as a function of control signals which are applied to an input of the adjustment means, and wherein the engine power control system has an electronic engine control unit which is configured to generate a series of control signals and to transmit them to the adjustment means, which control signals cause the adjustment means to change the rate at which fuel is output into the combustion chambers of the engine, in order thereby to adjust the output power of the engine, wherein the electronic engine power control system is configured to make available predictive change inputs with predetermined rates of change of the quantities of fuel fed to the combustion chambers of the engine, at times which are based on the times on which the respective operating conditions occur, and said engine power control system receives information which relates to the current and expected power requirements and uses this information to calculate the upcoming power requirements and to adapt the fuel flow rate to the engine in order to adapt the power output of the engine to the additive sum of the loads, and the engine power control system has at least one power curve which is stored in a memory, and/or an algorithm for a power curve, which power curve and/or algorithm can be used to make available a sequence of change inputs which are dependent on the predetermined operating conditions which differ from a measured engine speed, wherein the power curve or the algorithm (i) comprises a first rising line which represents a first quantity of small, step-shaped increases in the engine power over a first time period in the anticipation of an increasing grain load of a grain tank on the vehicle over the respective time period, characterized in that the power curve or the algorithm comprises the following: (ii) a second, relatively large step-shaped increase in the engine power which acts on the engine in anticipation of an increased load, and is then implemented if a discharge worm conveyor on the vehicle is activated in order to discharge grain from the grain tank, (iii) a third, relatively small, falling line which represents a second quantity of relatively small step-shaped decreases in the engine power over a second time period in the anticipation of a reduced load on the engine over a subsequent time period during which the discharging worm conveyor discharges grain from the grain tank, and (iv) a fourth, relatively large step-shaped decrease in the engine power which is brought about in anticipation of a reduced load of the engine and is implemented when the discharging worm conveyor is switched off. (ii) a second, relatively large step-shaped increase in the engine power which acts on the engine in anticipation of an increased load, and is then implemented if a discharge worm conveyor on the vehicle is activated in order to discharge grain from the grain tank, (iii) a third, relatively small, falling line which represents a second quantity of relatively small step-shaped decreases in the engine power over a second time period in the anticipation of a reduced load on the engine over a subsequent time period during which the discharging worm conveyor discharges grain from the grain tank, and (iv) a fourth, relatively large step-shaped decrease in the engine power which is brought about in anticipation of a reduced load of the engine and is implemented when the discharging worm conveyor is switched off.