Intermittent optimal controller

Claim 1

AN INTERMITTENT OPTIMAL PROCESS CONTROLLER FOR A PROCESS HAVING A PRESELECTED VARIALBE AS CONTROLLED VARIABLE COMPRISING IN COMBINATION PNEUMATIC MEMORY MEANS SAMPLING AND RETAINING AS A FUNCTION OF PNEUMATIC PRESSURE A MEASURE OF THE MAGNITUDE OF A PROCESS VARIABLE EXHIBITING AN OPTIMUM VALUE, UPON WHICH CONTROL IS TO BE BASE AT SUCCESSIVE REGULAR TIME INTERVALS PERMITTING A SUBSTANTIAL PROCESS VARIABLE CORRECTION AS A CONSEQUENCE OF THE IMMEDIATELY PRECEDING ADJUSTMENT OF SAID CONTROLLED VARIABLE, PNEUMATIC MEANS SENSING SAID PROCESS VARIABLE AS A FUNCTION OF PNEUMATIC PRESSURE AND OPPOSING IT TO SAID MEASURE OF SAID PROCESS VARIABLE RETAININED IN SAID PNEUMATIC MEMORY MEANS THEREBY GENERATING A PNEUMATIC PRESSURE SIGNAL PROPORTIONATE IN MAGNITUDE TO, AND IN ACCORDANCE WITH THE DIRECTION OF CHANGE OF, SAID PROCESS VARIABLE OVER SAID MEASURE RETAINED IN SAID PNEUMATIC MEMORY MEANS, AND MEANS RESPONSIVE TO SAID PNEUMATIC PRESSURE SIGNAL ALTERING SAID CONTROLLED VARIABLE IN A DIRECTION BRINGING SAID PROCESS VARIABLE TOWARDS SAID OPTIMUM VALUE UPON WHICH SAID CONTROL IS TO BE BASE AND IN AN AMOUNT PROPORTIONAL TO THE AMOUNT SAID PROCESS VARIABLE CHANGED SINCE THE IMMEDIATELY PRECEDING SAMPLING.