Closed loop fuel control system

Claim 1

A FUEL CONTROL FOR CONTROLLING A GAS TURBINE POWER PLANT HAVING A BURNER, A TURBINE RECEIVING THE PRODUCTS OF COMBUSTION DISCHARGING FROM SAID BURNER AND A COMPRESSOR DRIVEN BY SAID TURBINE, SAID CONTROL HAVING A HYDRAULIC COMPUTING SYSTEM INCLUDING FIRST VALVE MEANS MOVABLE IN RESPONSE TO COMPRESSOR DISCHARGE PRESSURE FOR GENERTING A FIRST HYDRAULIC PRESSURE SIGNAL, SECOND VALVE MEANS HAVING CONNECTION MEANS COMMUNICATING WITH SAID FIRST VALVE MEANS FOR RECEIVING SAID FIRST HYDRAULIC PRESSURE SIGNAL AND BEING MOVABLE IN RESPONSE TO CORRECTED COMPRESSOR SPEED FOR GENERATING A SECOND HYDRAULIC PRESSURE SIGNAL, THIRD VALVE MEANS HAVING CONNECTING MEANS COMMUNICATING WITH SAID SECOND VALVE MEANS FOR RECEIVING SAID SECOND HYDRAULIC PRESSURE SIGNAL AND BEING MOVABLE IN RESPONSE TO COMPRESSOR INLET TEMPERATURE FOR GENERATING A THIRD HYDRAULIC PRESSURE SIGNAL, SAID CONTROL ALSO HAVING A FUEL METERING SYSTEM INCLUDING FUEL REGULATING MEANS HAVING ACTUATING MEANS FOR INJECTING FUEL TO SAID BURNER, MEANS FOR APPLYING SAID THIRD HYDRAULIC PRESSURE SIGNAL TO SAID ACTUATING MEANS, MEANS RESPONSIVE TO THE PRESSURE DROP ACROSS SAID BURNER FOR DEVELOPING A FOURTH HYDRAULIC PRESSURE SIGNAL, AND MEANS FOR APPLYING SAID FOURTH HYDRAULIC PRESSURE SIGNAL TO SAID ACTUATING MEANS, WHEREBY THE SAID ACTUATING MEANS WILL POSITION SAID FUEL REGULATING MEANS IN RESPONSE TO THE DIFFERENCE BETWEEN SAID THIRD HYDRAULIC PRESSURE SIGNAL AND SAID FOURTH HYDRAULIC PRESSURE SIGNAL.