Device for controlling electric clutches of vehicles

Claim 1

AN ELECTRIC CLUTCH WITH A CONTROL CIRCUIT THEREFOR, SAID CONTROL CIRCIUT CONTROLLING SAID ELECTRIC CLUTCH IN A MOTOR VEHICLE AS FUNCTION OF MOTOR SPEED, SAID CONTROL CIRCUIT COMPRISING AN INGNITION SYSTEM INCLUDING A DIRECT CURRENT SOURCE, AN IGNITION COIL, A DISTRIBUTOR, AND BEAKER POINTS, A POWER TRANSISTOR, SAID POWER TRANSISTOR CONTROLLING THE OUTPUT OF SAID DIRECT CURRENT SOURCE AND BEING CONTROLLED BY THE IGNITION CURRENT IMPULSES TO THE MOTOR, A CONTROL TRANSITOR, A DIODE, A CONDENSER, A TRANSFORMER, THE PRIMARY OF SAID TRANSFORMER BEING CONNECTED IN SERIES WITH THE IGNITION COIL AND THE SECONDARY BEING CONNECTED ACROSS SAID CONDENSER THROUGH SAID DIODE, SAID CONDENSER BEING FURTHER CONNECTED BETWEEN THE EMITTER AND BASE OF SAID CONTROL TRANSISTOR SO AS TO BE CHARGED EACH TIME THE BRAKER POINT OPEN, A RESISTANCE ONE END OF WHICH IS CONNECTED BETWEEN SAID CONDENSER AND THE BASE OF SAID CONTROL TRANSISTOR AND THE OTHER END OF WHICH IS CONNECTED TO SAID DIRECT CURRENT SOURCE, THE COLLECTOR OF SAID CONTROL TRANSISTOR BEING CONNECTED TO A RESISTANCE AND TO THE BASE OF SAID POWER TRANSISTOR, SAID POWER TRANSISTOR ENERGIZING SAID ELECTRIC CLUTCH THROUGH THE COLLECTOR, THE POWER DIODE BEING CONNECTED TO THE EMITTER OF SAID POWER TRANSISTOR FOR BLOCKING AND POWER TRANSISTOR WHEN THE MOTOR IS NOT RUNNING, WHEREBY POLARITIES ARE SO SELECTED THAT EACH TIME THE CONTACT BEAKER OPENS THE VOLTAGE OF SAID CURRENT SOURCE IS ADDED THROUGH THE RESISTANCE TO THE CHARGING VOLTAGE OF SAID CONDENSER TO PROVIDE A STEEP-SIDED WAVE OF SUBSTANTIALLY CONTACT DURATION, THE VALUE OF SAID REISTANCE BEING SUCH THAT SAID CONTROL TRANSISTOR BECOMES COMPLETELY CONDUCTIVE BETWEEN THE CHARGING WAVE WHEREASAS IT IS BLOCKED BY THE PASSAGE OF EACH OF SAID CHARGING WAVES TO MAKE THE POWER TRANSISTOR CONDUCTIVE, THE MAXIMUM CURRENT IN THE CLUTCH WINDING BEING OBTAINED WHEN THE CHARGING WAVES OVERLAP ABOVE A MOTOR SPEED SELECTED BY SETTING THE VALUES OF SAID RESISTANCE AND SAID CONDENSER, SAID CONDENSER DISCHARGE BEING LIMITED BY THE LOW IMPEDANCE OF THE BASE TO EMITTER CIRCUIT OF SAID CONTROL TRANSISTOR AT LOWER MOTOR SPEEDS AND BETWEEN CHARGING WAVES.