pearson

Claim 1

IN A FUEL CONTROL SYSTEM FOR A GAS TURBINE ENGINE INCLUDING A FUEL CONDUIT TO SAID ENGINE, A VALVE IN SAID CONDUIT, AN ALL-SPEED GOVERNOR OPERATIVELY CONNECTED TO SAID VALVE INCLUDING A SPEED REFERENCE DEVICE AND AN OPERATOR-OPERATED MEANS FOR SUPPLYING A REQUEST TO SAID DEVICE; A TEMPERATURE LIMITING SYSTEM COMPRISING MEANS PRODUCING AN ELECTRICAL SIGNAL WHOSE MAGNITUDE AND POLARITY ARE DETERMINED BY THE MAGNITUDE AND SENSE OF THE DEPARTURE IN TEMPERATURE OF THE COMBUSTION GAS TEMPERATURE FROM A GIVEN TEMPERATURE, MAGNETIC AMPLIFIER MEANS INCLUDING AN OUTPUT STAGE FOR AMPLIFYING SAID ELECTRICAL SIGNAL, A MOTOR DRIVEN BY SAID OUTPUT STAGE OPERATIVELY CONNECTED TO SAID SPEED REFERENCE DEVICE FOR VARYING ITS EFFECTIVE REFERENCE VALUE, A RATE GENERATOR DRIVEN BY SAID MOTOR FOR PRODUCING A SIGNAL VARYING WITH THE VELOCITY AND DIRECTION OF ROTATION OF SAID MOTOR, MEANS FOR MODIFYING SAID RATE SIGNAL, A MAGNETIC AMPLIFIER FOR AMPLIFYING SAID MODIFIED RATE SIGNAL, SAID AMPLIFIER HAVING A SUBSTANTIAL EFFECTIVE CONTROL WINDING INDUCTANCE PRODUCING A LARGE LAGGING TIME CONSTANT, AND MEANS FOR CONNECTING THE OUTPUT OF SAID MAGNETIC AMPLIFIER TO SAID OUTPUT STAGE TO THEREBY PROVIDE TO SAID MAGNETIC AMPLIFIER MEANS A STABILIZING SIGNAL WHICH APPEARS AS A LEADING TIME CONSTANT.