| 摘要 |
PURPOSE:To restrain the power drop and improve the efficiency by interposing a micro-flow control valve between a high pressure gas pipe and a low pressure gas pipe and calculating the most suitable valve opening rate of the micro-flow control valve based on the relationship among an engine speed, an average charging pressure and a valve opening rate of the micro-flow control valve. CONSTITUTION:A plurality of heat exchange chambers 4 and cylinders 6 are alternately connected annularly. Also, a high pressure gas pipe 9 for supplying working gas is connected to a tank 8 attached to a discharge side of a compressor 7, and a low pressure gas pipe 10 for recovering working gas is connected to an intake side of the compressor 7. In the aforesaid constitution, a micro-flow control valve 13 used as a by-pass valve is interposed between both the pipes 9 and 10. And, an average value of gas pressure in the pipes 9 and 10, an engine speed and a pre-memorized data are compared in control unit to calculate the most suitable valve opening rate. Thereby, the most suitable output for a stepping motor is decided, and the valve opening rate of the micro-flow control valve is controlled to the best value.
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