Gas turbine engine control

Claim 1

A FUEL CONTROL FOR A GAS FIRED GAS TURBINE ENGINE HAVING AN AIR COMPRESSOR COMPRISING: GAS SUPPLY CONDUIT MEANS CONNECTED TO SAID ENGINE FOR SUPPLYING A PRESSURIZED GAS FUEL THERETO, A METERING RESTRICTION IN SAID CONDUIT MEANS CAUSING A GAS FUEL PRESSURE DROP, A REGULATOR VALVE IN SAID CONDUIT MOVABLE TO CONTROL SAID GAS FUEL PRESSURE DROP ACROSS SAID METERING RESTRICTION, PRESSURE RESPONSIVE MEANS RESPONSIVE TO GAS PRESSURE IN SAID CONDUIT MEANS AND A PRESSURE GENERATED BY SAID ENGINE COMPRESSOR, SAID PRESSURE RESPONSIVE MEANS BEING CONNECTED TO SAID REGULATOR VALVE TO CONTROL A SUBSTANTIALLY CONSTANT RATIO PRESSURE DROP ACROSS SAID METERING RESTRICTION, ENGINE SPEED RESPONSIVE GOVERNOR MEANS CONNECTED TO SAID PRESSURE RESPONSIVE MEANS OPERATIVE TO CONTROL SAID COMPRESSOR GENERATED PRESSURE ACTING THEREON, SAID GOVERNOR MEANS OPERATIVE WHEN SAID ENGINE IS UNDER SPEED TO CONTROL SAID COMPRESSOR DISCHARGE PRESSURE TO A FIRST HIGH PRESSURE VALUE CAUSING SAID PRESSURE RESPONSIE MEANS TO REGULATE A FIRST HIGH SUBSTANTIALLY CONSTANT RATIO PRESSURE DROP ACROSS SAID METERING RESTRICTION TO DEFINE AN UPPER FUEL LIMIT DURING ENGINE ACCELERATIONS, SAID GOVERNOR MEANS OPERATIVE WHEN SAID ENGINE IS OVER SPEED TO CONTROL SAID COMPRESSOR DISCHARGE PRESSURE TO A SECOND LOWER PRESSURE VALUE CAUSING SAID PRESSURE RESPONSIVE MEANS TO REGULATE A SECOND LOWER SUBSTANTIALLY CONSTANT RATIO PRESSURE DROP ACROSS SAID METERING RESTRICTION TO DEFINE A LOWER FUEL LIMIT DURING ENGINE DECELERATIONS, SAID GOVERNOR MEANS FURTHER OPERATIVE TO CONTROL SAID COMPRESSOR DISCHARGE PRESSURE BETWEEN SAID FIRST HIGH AND SECOND LOW PRESSURE VALUES DURING ENGINE GOVERNING AND THEREBY REGULATE THE PRESSURE RATIO ACROSS SAID METERING RESTRICTION TO A VALUE INTERMEDIATE SAID UPPER AND LOWER SUBSTANTIALLY CONSTANT LIMITS.