CD ignition system with anti-reverse feature

Internal-combustion engines – Igniters – Incandescent

Patent

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Details

123148S, 123198DC, F02P 100

Patent

active

039555496

ABSTRACT:
A capacitor-discharge ignition system for a two-stroke internal combustion engine has a trigger coil which during forward rotation of the crankshaft discharges a capacitor through the primary coil of an ignition transformer to produce an appropriately timed ignition spark. The discharge and spark occur when a magnet mounted on the flywheel of the engine intercepts the trigger coil at a crankshaft or piston position in the vicinity of top dead center. The trigger coil discharges the capacitor by supplying a trigger signal to the control gate of a silicon controlled rectifier (SCR) located in the discharging path between the capacitor and the primary coil of the ignition transformer. The primary coil, which is connected to the cathode of the SCR, is mounted on a stator core intercepted by the magnet on the flywheel no less than 60.degree. after top dead center. If, for any reason, the crankshaft of the engine should be rotated in the reverse direction, the voltage induced in the primary coil by the magnet reduces the gate-to-cathode bias on the SCR and causes any charge on the capacitor to discharge through the primary. Any ignition spark created is too far in advance of the top dead center position and sustained engine operation in the reverse direction, therefore, is inhibited.

REFERENCES:
patent: 3405347 (1968-10-01), Swift et al.
patent: 3545420 (1970-12-01), Foreman
patent: 3554179 (1971-01-01), Burson
patent: 3722488 (1973-03-01), Swift et al.

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