Abstract: An expansion engine having a cylinder with a piston and a head provided with a housing in which the housing is subdivided by a partition into a first chamber and a second chamber. The first chamber is in open communication with the cylinder by means of an opening and has at least one burner supported by the partition extending into it. The second chamber communicates with a reservoir for compressed air by way of a conduit and an inlet valve. The reservoir is connected with the cylinder by means of a non-return valve. Both chambers communicate with each other by means of a pressure equalizing conduit which also serves as a heat seal. Air and fuel are supplied to the burner to permit continuous burning.

Abstract: 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.

Abstract: The present invention relates to a device comprising an expansion engine, having at least one cylinder and a piston moving therein and a separate apparatus for feeding said expansion engine with combustion gases under pressure.