Interlock circuit for de-activating an engine

Details Interlock circuit for de-activating an engine Interlock circuit for de-activating an engine

1991-09-10

1993-03-02

Nelli, Raymond A.

Internal-combustion engines

High tension ignition system

Safety device

123198DC, F02P 1100

Patent

active

051900190

ABSTRACT:
A safety circuit coupled to an ignition circuit and a magneto coil for disabling an engine that powers a riding lawn mower. The circuit includes a triac which is rendered conductive in response to a sensed unsafe condition. The triac turns on to short the magneto coil and prevent generation of a spark plug energization voltage. A capacitor coupled to the triac gate electrode charges in the event an unsafe condition is sensed and is prevented from charging when operating conditions are safe.

REFERENCES:
patent: 3884203 (1975-05-01), Cliffgard
patent: 4369745 (1983-01-01), Howard
patent: 4385617 (1983-05-01), Nakata et al.
patent: 4392474 (1983-07-01), Minner
patent: 4565179 (1986-01-01), Nytomt et al.
patent: 4594978 (1986-06-01), Kanno

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