Control system for an electromagnetic clutch

Claim 1

A CONTROL SYSTEM FOR AN ELECTRO-MAGNETIC CLUTCH OF AN AUTOMOTIVE VEHICLE ENGINE HAVING A FUEL ADMISSION CHAMBER WHICH ALSO PROVIDES A SOURCE OF VACUUM, A THROTTLE VALVE WHICH ADJUSTS THE FLOW OF FUEL FEEDING SAID CHAMBER, A THROTTLE LINKAGE OPERATIVELY CONNECTED TO SAID VALVE TO CONTROL THE VALVE SETTING, AND AN ACCELERATOR PEDAL COUPLED TO SAID THROTTLE LINKAGE FOR CONTROLLING THE LATTER, SAID CLUTCH CONTROL SYSTEM COMPRISING AN ELECTRICAL SUPPLY CIRCUIT CONNECTED TO SAID CLUTCH TO SUPPLY ACTUATING VOLTAGE THERETO, SAID ELECTRICAL SUPPLY CIRCUIT INCLUDING IN SERIES THEREWITH A VARIABLE RESISTOR HAVING A MOVABLE SLIDER CONTACT FOR VARYING THE EFFECTIVE RESISTANCE OF THE VARIABLE RESISTOR AND THEREBY VARYING THE ACTUATING VOLTAGE TO SAID CLUTCH, CONNECTING MEANS OPERATIVELY CONNECTING SAID THROTTLE LINKAGE TO SAID SLIDER CONTACT, SAID CONNECTING MEANS INCLUDING A PRESSURE RESPONSIVE ACTUATOR MEANS FOR ADJUSTING SAID CONNECTING MEANS TO MOVE SAID SLIDER CONTACT INDEPENDENTLY OF SAID THROTTLE LINKAGE BUT IN ACCORDANCE WITH VARIATIONS OF PRESSURE IN THE ACTUATOR MEANS, AND CONDUIT MEANS OPERATIVELY CONNECTING SAID ACTUATOR MEANS TO THE FUEL ADMISSION CHAMBER ACTING AS A SOURCE OF VACUUM SO THAT THE POSITION OF SAID SLIDER CONTACT UPON SAID RESISTOR DEPENDS UPON BOTH THE THROTTLE LINKAGE POSITION AND THE DEGREE OF VACUUM IN SAID FUEL ADMISSION CHAMBER.