Engine control with anticipator

Claim 1

A CONTROL SYSTEM FOR A GAS TURBINE ENGINE CONNECTED TO AND DRIVING A VARIABLE LOAD COMPRISING, IN COMBINATION, OPERATOR-CONTROLLABLE MEANS FOR VARYING ENGINE POWER OUTPUT MEANS FOR CONTROLLING ENGINE FUEL ACTUATED BY THE SAID MEANS OPERATOR-CONTROLLABLE MEANS FOR VARYING THE POWER DEMAND OF THE LOAD MEANS TRANSMITTING A SIGNAL INDICATIVE OF ENGINE POWER OUTPUT TO THE LOAD A SETTABLE GOVERNING MEANS RESPONSIVE TO ENGINE SPEED EFFECTIVE TO REGULATE ENGINE FUEL THE GOVERNING MEANS INCLUDING MEANS ESTABLISHING A REFERENCE SIGNAL AND MEANS RESPONSIVE TO ENGINE SPEED EFFECTIVE TO DERIVE A GOVERNING SIGNAL FROM THE REFERENCE SIGNAL AND TO DECREASE THE GOVERNING SIGNAL RELATIVE TO THE REFERENCE SIGNAL UPON OVERSPEED AND FURTHER INCLUDING DIFFERENTIAL RESPONSIVE MEANS NORMALLY RESPONSIVE TO THE REFERENCE AND GOVERNING SIGNALS EFFECTIVE TO VARY ENGINE FUEL IN THE DIRECTION TO REDUCE FUEL UPON OVERSPEED, AND ANTICIPATOR MEANS OPERATIVE TO ACCELERATE ENGINE RESPONSE TO AN INCREASE IN LOAD INCLUDING MEANS SHIFTABLE FROM A NORMAL CONDITION TO AN OPERATED CONDITION TO DISCONNECT THE REFERENCE SIGNAL FROM THE DIFFERENTIAL RESPONSIVE MEANS AND CONNECT INSTEAD A SIGNAL LOWER THAN THE REFERENCE SIGNAL MEANS RESPONSIVE TO THE POWER DEMAND VARYING MEANS COUPLED TO THE SHIFTABLE MEANS, AND MEANS RESPONSIVE TO THE ENGINE POWER OUTPUT SIGNAL COUPLED TO THE SHIFTABLE MEANS THE TWO LAST-MENTIONED MEANS BEING S CONNECTED THAT THE SHIFTABLE MEANS REMAINS IN NORMAL CONDITION ABOVE A PREDETERMINED POWER OUTPUT LEVEL AND ALSO BELOW A PREDETERMINED POWER DEMAND LEVEL AND IS OPERATED IN RESPONSE TO HIGHER POWER DEMAND CONCURRENT WITH LOWER POWER OUTPUT.