Internal combustion engine ignition system

Abstract

Abstract AN INTERNAL COMBUSTION ENGINE IGNITION SYSTEM OF THE TYPE RESPONSIVE TO ALTERNATING CURRENT IGNITION SIGNALS PRODUCED IN TIME RELATIONSHIP WITH THE ENGINE, THE IGNITION COIL PRIMARY WINDING, THE COLLECTOR-EMITTER ELECTRODES OF AN IGNITION COIL PRIMARY WINDING SWITCHING TRANSISTOR AND A CONTROL RESISTOR ARE CONNECTED IN SERIES ACROSS THE BATTERY AND FORWARD BASE-EMITTER CURRENT IS SUPPLIED TO THE SWITCHING TRANSISTOR THROUGH THE COLLECTOR-EMITTER ELECTRODES OF A COIL PRIMARY WINDING SWITCHING TRANSISTOR. A TRIGGER CIRCUIT NORMALLY CONDUCTING CONTROL TRANSISTOR. A TRIGGER CIRCUIT IS RESPONSIVE TO EACH SELECTED HALF CYCLE OF THE ALTERNATING CURRENT IGNITION SIGNALS TO ESTABLISH A SHUNT CIRCUIT WHICH SHUNTS BASE-EMITTER CURRENT FROM THE CONTROL TRANSISTOR TO EXTINGUISH THIS DEVICE AND, CONSEQUENTLY, THE SWITCHING TRANSISTOR WHEREBY THE SWITCHING TRANSISTOR IS OPERATED CONDUCTIVE AND NOT CONDUCTIVE IS TIMED RELATIONSHIP WITH THE ENGINE. ANOTHER TRANSISTOR, RESPONSIVE TO THE POTENTIAL DEVELOPED ACROSS THE CONTROL RESISTOR, SHUNTS BASE-EMITTER CURRENT FROM THE CONTROL RESISTOR, SHUNTS BASE-EMITTER PRIMARY WINDING ENERGIZING CURRENT TO A PREDETERMINED MAGNITUDE AND ANOTHER TRANSISTOR TO LIMIT IGNITION COIL CONTROL POTENTIAL, ESTABLISHES THE ELECTRICAL ANGLE OF EACH CYCLE OF THE ALTERNATING CURRENT IGNITION SIGNALS AT WHICH THE CONTROL TRANSISTOR CONDUCTS TO DETERMINE THE LENGTH OF TIME ENERGIZING CURRENT FLOWS THROUGH THE IGNITION COIL PRIMARY WINDING.

Inventors

• 👤 Paul D Le Masters
• 👤 James E Shearer

Bibliographic Details