Control system

Claim 1

IN A SYSTEM FOR CONTROLLING THE RATIO OF A FIRST FLUID STREAM MIXED WITH A SECOND FLUID STREAM IN WHICH METER MEANS DISPOSED IN SAID FIRST AND SECOND FLUID STREAMS GENERATE FIRST AND SECOND ELECTRICAL SIGNALS WHOSE FREQUENCY IS PROPORTIONAL TO THE FLOW RATE OF SAID FIRST AND SECOND STREAMS RESPECTIVELY THE COMBINATION WITH SAID METER MEANS COMPRISING: FIRST SECOND CIRCUIT MEANS, EACH OF SAID FIRST AND SECOND CIRCUIT MEANS INCLUDING A SOURCE OF DIRECT CURRENT POTENTIAL AND A CAPACITOR; A SWITCHING MEANS DISPOSED IN EACH OF SAID FIRST AND SECOND CIRCUITS TO ALTERNATELY CONNECT THE CAPACITORS IN SAID FIRST AND SECOND CIRCUITS TO SAID POTENTIAL SOURCES AND TO A CAPACITOR DISPOSED IN A THIRD CIRCUIT TO DISCHARGE THE CAPACITORS IN SAID FIRST AND SECOND CIRCUITS TO THE CAPACITOR IN THE THIRD CIRCUIT IN OPPOSITION TO EACH OTHER; THE SWITCHING MEANS DISPOSED IN SAID FIRST AND SECOND CIRCUITS BEING CONTROLLED BY SAID FIRST AND SECOND SIGNALS TO CHARGE THE CAPACITOR IN SAID THIRD CIRCUIT AS A FUNCTION OF THE DIFFERENCE BETWEEN TOTAL FLOW OF EACH OF SAID STREAMS AND CONTROL MEANS RESPONSIVE TO THE VOLTAGE ACROSS THE CAPACITOR IN SAID THIRD CIRCUIT FOR CONTROLLING THE FLOW IN ONE OF SAID FLUID STREAMS.