A method for controlling the driving power of an expansion engine and an expansion device for carrying out said method, said expansion device being driven by the combustion gases of a separate combustion device to which fuel and air are supplied, said air being supplied to said combustion device by a supercharger via a cooling installation and after compression in said expansion engine the temperature of said compressed air being modified by its cooling in said cooling installation in such a way that the power control takes place by setting the compression temperature of said compressed air at a chosen constant combustion temperature of the combustion gases in said combustion device.
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