Electronic starting motor control

Details Electronic starting motor control Electronic starting motor control

1988-12-12

1990-04-17

Paschall, M. H.

Prime-mover dynamo plants

Electric control

Electric-starting motor

F02N 1108

Patent

active

049174100

ABSTRACT:
An electric starting system for controlling an electric starter that has a solenoid for shifting a pinion and for closing solenoid contacts to energize a cranking motor that drives the pinion. The solenoid has a single coil connected in series with a plurality of parallel connected field effect transistors. The circuit that energizes the solenoid coil through the field effect transistors is in parallel with the solenoid contacts and the cranking motor. The gates of the transistors are connected to an oscillator which causes the transistors to be repeatedly turned on and off at a predetermined frequency and duty cycle. Pulses of current are supplied to the solenoid coil which are sufficient to maintain the pinion meshed with the ring gear of an engine and to maintain said solenoid contacts closed without overheating the coil.

REFERENCES:
patent: 2017074 (1935-10-01), Prescott
patent: 2542712 (1951-02-01), Schneider et al.
patent: 3076098 (1963-01-01), Colvill et al.
patent: 4586467 (1986-05-01), Raver
patent: 4674344 (1987-06-01), Kazino et al.
patent: 4731543 (1988-03-01), Buetemeister et al.
patent: 4755689 (1988-07-01), Porter
Research Disclosure No. 27844, Electric Engine Starter control System, Jun. 1987.

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