Internal-combustion engines – Engine speed regulator – Engine speed reduction by partial or complete omission of...
Patent
1996-10-10
1998-05-26
Dolinar, Andrew M.
Internal-combustion engines
Engine speed regulator
Engine speed reduction by partial or complete omission of...
F02P 900
Patent
active
057551995
ABSTRACT:
A discharge ignition apparatus for use with a small internal combustion engine has built-in overspeed disable capability. At operating speeds below an overspeed threshold, revolution of a magnet assembly past a stator unit having a magnetically permeable core causes accumulation of charge across a storage capacitor. When the capacitor has reached a fully charged state, a triggering signal is applied to the gate of a SCR device to cause rapid discharge through the primary coil of a step-up transformer. The higher voltage produced at the secondary coil of the step-up transformer is then applied across the gap of a spark plug. At operating speeds exceeding the overspeed threshold, a second trigger circuit renders the SCR conductive prior to substantial accumulation of charge across the storage capacitor. The second trigger circuit includes a zener diode or other voltage threshold element in circuit with a trigger coil operative to produce a speed dependent voltage signal. A high-pass filter, such as a passive RC filter, may be connected interposing the trigger coil and the zener diode to condition the waveform and inhibit accelerated trigger of the SCR at speeds below the overspeed threshold.
REFERENCES:
patent: 3993031 (1976-11-01), Schmaldienst et al.
patent: 4038951 (1977-08-01), Schweikart
patent: 4344395 (1982-08-01), Kondo et al.
patent: 4404940 (1983-09-01), Sieja
Costello John J.
Hummert George T.
Moran Edward D.
Dolinar Andrew M.
R. E. Phelon Co., Inc.
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