Automatic control system

Claim 1

A CONTROL SYSTEM FOR ADJUSTING A CONTROL ELEMENTS TO REGULATE A MEASURED VARIABLE COMPRISING A COMBINATION, A MEASURING AND TRANSMITTING MEANS FOR PROVIDING A SIGNAL PROPORTIONAL TO A CHANGE IN SAID MEASURED VARIABLE, A BIASING MEANS CONNECTED TO SAID MEASURING AND TRANSMITTING MEANS FOR REMOVING A PREDETERMINED AMOUNT FROM SAID PROPORTIONAL SIGNAL, A MULTIPLYING MEANS CONNECTED TO SAID BIASING MEANS FOR MULTIPLYING SAID PROPORTIONAL SIGNAL, SET-POINT INTRODUCING MEANS FOR INTRODUCING A SETPOINT OF OPERATION FOR SAID CONTROL SYSTEM AND PROVIDING A CORRESPONDING SET-POINT SIGNAL, A COMPARATOR MEANS CONNECTED TO SAID MULTIPLYING MEANS AND SAID SET-POINT INTRODUCING MEANS FOR COMPARING SAID MULTIPLIED PROPORTIONAL SIGNAL WITH SAID SET-POINT SIGNAL, SAID COMPARATOR PRODUCING A MAXIMUM OUTPUT SIGNAL WHEN SAID MULTIPLIED PROPORTIONAL SIGNAL IS LESS THAN SAID SET-POINT SIGNAL AND NO SIGNAL OUTPUT WHEN SAID MULTIPLIED PROPORTIONAL SIGNAL IS GREATER THAN SAID SET-POINT SIGNAL, A SIGNAL RESTRICTING MEANS CONNECTED TO SAID COMPARATOR MEANS FOR PROVIDING A SIGNAL WHICH BUILDS UP WITH TIME TO A VALUE EQUAL TO SAID MAXIMUM OUTPUT SIGNAL FROM SAID COMPARATOR WHEN SAID COMPARATOR PRODUCES SAID FULL OUTPUT SIGNAL, AND PROVIDING DECAY WITH TIME OF A SIGNAL PREVIOUSLY TRANSMITTED THERETHROUGH WHEN SAID COMPARATOR PRODUCES NO OUTPUT SIGNAL, THEREBY PROVIDING A SMOOTHLY RISING OR FALLING CONTROL SIGNAL TO SAID CONTROL ELEMENT.