Patent ID: 7556473

Claim:
A control unit for a compressor, comprising: an inflow quantity regulating means for regulating the inflow quantity of a fuel gas to a compressor; a recycle valve for returning the fuel gas discharged from the compressor to the inlet side of the compressor; and a control means which sets a control operating value for operating the compressor at a predetermined operation point, and controls the inflow quantity regulating means and the recycle valve based on the control operating value, characterized in that the control means has a first control signal generating means which generates a signal increasing with an increase in the operating value as a control signal for the inflow quantity regulating means when the control operating value is a predetermined value or larger and a second control signal generating means which generates a signal decreasing with an increase in the operating value as a control signal for the recycle valve when the control operating value is smaller than the predetermined value.