Control of the Free-Piston Stirling Engine Generally speaking, the control of a free-piston type of Stirling engine is quite difficult due to the fact that the strength of the gas spring set between a displacer and a power piston is varied in response to a stroke of the power piston and also the temperature itself. In the present system, in order to solve these problems, the output variation caused by an input and/or a load condition is trimmed by using a dummy load. This control system and feature are shown in Fig. 7. The dummy load is always adjusted so as to keep the output power at the requested value.
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