Prime-mover dynamo plants – Electric control – Electric-starting motor
Patent
1988-12-12
1990-03-06
Leung, Philip H.
Prime-mover dynamo plants
Electric control
Electric-starting motor
361 29, 361 33, F02N 1108, H02H 708
Patent
active
049068571
ABSTRACT:
An electronic starting motor control system for electric starting apparatus of a type that has a solenoid including a solenoid coil. Energization of the solenoid coil causes solenoid contacts to close and causes a pinion to be shifted into mesh with the ring gear of an engine to be cranked. The current supply to the solenoid coil is controlled by a plurality of parallel connected field effect transistors that are turned on and off. The system has a fail safe circuit which operates to cause the wire bonds of the field effect transistors to open in the event that a field effect transistor fails by shorting. The system has an overvoltage protection circuit which during an overvoltage condition shuts off the supply of voltage to the gates of the transistors and shuts off the voltage supply to a plurality of control circuits that are coupled to the gates of the transistors.
REFERENCES:
patent: 4679112 (1987-07-01), Craig
patent: 4680512 (1987-07-01), Melocik
patent: 4731543 (1988-03-01), Buetemeister et al.
Research Disclosure #27844, Electric Engine Starter Control System, Jun. 1987.
Cummins Donald L.
Santichen Stephen P.
Duncanson Jr. W. E.
Kikusui Line Co., Ltd.
Leung Philip H.
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