Automotive cruise control

Claim 1

IN A CRUISE CONTROL SYSTEM FOR AN AUTOMOTIVE VEHICLE HAVING AN ENGINE AND A DRIVER OPERATED THROTTLE CONTROL MEMBER FOR CONTROLLING THE FUEL SUPPLY TO THE ENGINE, A POWER UNIT HAVING A PRESSURE RESPONSIVE ELEMENT LOCATED THEREIN, SAID PRESSURE RESPONSIVE ELEMENT BEING OPERATIVELY CONNECTED TO SAID THROTTLE CONTROL MEMBER FOR CONTROLLING MOVEMENT THEREOF, FLUID PRESSURE MEANS FOR CAUSING MOVEMENT OF SAID PRESSURE RESPONSIVE ELEMENT, SOLENOID VALVE MEANS FOR COMMUNICATING SAID FLUID PRESSURE MEANS WITH SAID PRESSURE RESPONSIVE ELEMENT UPON ENERGIZATION THEREOF, MODULATING VALVE MEANS OPERATIVELY CONNECTED TO SAID POWER UNIT FOR REGULATING AND CONTROLLING THE APPLICATION OF SAID FLUID PRESSURE TO SAID PRESSURE RESPONSIVE ELEMENT, SPEED RESPONSIVE GOVERNOR MEANS OPERATIVELY CONNECTED TO SAID MODULATINUG VALVE MEANS FOR CONTROLLING MOVEMENT THEREOF AT PREDETERMINED SPEEDS, SAID GOVERNOR MEANS INCLUDING A VARIABLE GOVERNOR LOAD SPRING FOR DETERMINING THE SPEED AT WHICH MOVEMENT OF SAID MODULATING VALVE MEANS OCCURS, A FLUID PRESSURE GOVERNOR LOADING CYLINDER CONNECTED TO SAID GOVERNOR LOAD SPRING THEREIN OPERATIVELY CONNECTED TO SAID GOVERNOR LOAD SPRING FOR VARYING AND SETTING THE EFFECTIVE FORCE EXERTED BY SAID SPRING, SECOND SOLENOIDE VALVE MEANS FOR COMMUNICATION SAID FLUID PRESSURE MEANS WITH SAID PRESSURE RESPONSIVE MEMBER UPON ENERGIZATION THEREOF, LOCKING SOLENOIDE MEANS OPERATIVELY CONNECTED TO SAID PRESSURE RESPONSIVE MEMBER FOR PERMITTING MOVEMENT THEREOF WHEN SAID SOLENOID IS ENERGIZED AND PREVENTING MOVEMENT THEREOF WHEN SAID SOLENOIDE IS DEENERGIZED, AND MANUALLY OPERABLE MEANS FOR PERMITTING ENERGIZATION OF SAID FIRST AND SECOND SOLENOID VALVE MEANS AND SAID LOCKING SOLENOID MEANS.