Fuel supply control for gas turbine engines

Claim 1

A FUEL SUPPLY CONTROL FOR A GAS TURBINE ENGINE HAVING A COMPRESSOR, COMPRISING IN COMBINATION PRESSURESENSITIVE MEANS PROVIDING AN ELECTRICAL SIGNAL DEPENDENT ON THE PRESSURE OF AIR ENTERING THE COMPRESSOR, TEMPERATURE-SENSITIVE MEANS PROVIDING AN ELECTRICAL SIGNAL DEPENDENT ON THE TEMPERATURE OF AIR ENTERING THE COMPRESSOR, SPEED-SENSITIVE MEANS PROVIDING AN ELECTRICAL SIGNAL DEPENDENT ON THE ACTUAL SPEED OF THE ENGINE, FUNCTION-GENERATING MEANS CONNECTED TO THE TEMPERATURE-SENSITIVE MEANS AND TO THE SPEED-SENSITIVE MEANS, AND PRODUCING AN OUTPUT SIGNAL DEPENDENT ON AN EMPIRICALLY DETERMINED FUNCTION OF SAID SPEED AND SAID TEMPERATURE, SIGNAL MODIFYING MEANS CONNECTED TO THE OUTPUT FROM THE FUNCTION GENERATING MEANS AND TO THE PRESSURE SENSITIVE MEANS, SAID SIGNAL MODIFYING MEANS PRODUCING AN OUTPUT SIGNAL DEPENDENT ON SAID PRESSURE AND SAID EMPIRICALLY DETERMINED FUNCTION, AN INTEGRATOR CONNECTED TO SAID SIGNAL MODIFYING MEANS, SAID INTEGRATOR PRODUCING AN OUTPUT WHICH DEPENDS ON SAID PRESSURE AND THE INTEGRAL OF SAID FUNCTION, AND WHICH IS AN EMPIRICALLY DETERMINED SCHEDULE OF THE ENGINE SPEED SUCH AS WILL PREVENT STALLING OF THE COMPRESSOR, A CONTROLLER CONNECTED TO THE SPEED-SENSITIVE MEANS AND TO THE INTEGRATOR OUTPUT, MEANS OPERABLE BY SAID CONTROLLER FOR VARYING THE RATE OF SUPPLY OF FUEL TO THE ENGINE WHEN THE RELATIVE MAGNITUDE OF THE SIGNALS RECEIVED BY THE CONTROLLER VARIES FROM A PREDETERMINED VALUE, MANUALLY OPERABLE MEANS PRODUCING A SIGNAL DEPENDENT ON THE DESIRED SPEED OF THE ENGINE, AND MEANS CONNECTED TO SAID MANUALLY OPERABLE MEANS FOR BREAKING ELECTRICAL CONNECTION BETWEEN THE FUNCTION GENERATING MEANS AND THE INTEGRATOR, THE OUTPUT FROM SAID INTEGRATOR THEN REMAINING CONSTANT UNTIL THE ACTUAL AND DESIRED SPEEDS ARE NOT EQUAL AND COMMUNICATION BETWEEN THE INTEGRATOR AND THE FUNCTION GENERATING MEANS IS REESTABLISHED.