Safety device for controlling an ignition circuit

Details Safety device for controlling an ignition circuit Safety device for controlling an ignition circuit

1978-03-08

1980-09-23

Argenbright, Tony M.

Internal-combustion engines

Starting device

For airplane

74850, 123198D, F02N 1510, B60K 4104

Patent

active

042236576

ABSTRACT:
A safety device for controlling an ignition circuit for an internal combustion engine associated with a transmission coupling the engine to a load comprises a thyristor adapted to permit, upon conduction thereof, the ignition circuit to produce a high voltage to fire a spark plug provided in the engine, a position-responsive switch adapted to permit application of a trigger signal from a power supply to the gate of the thyristor only when the transmission is in neutral, and a capacitor coupled across the gate and cathode of the thyristor to be charged by a voltage drop thereacross and to provide a trigger signal to the gate of the thyristor. Once the capacitor is charged it maintains a condition wherein the thyristor is turned on whenever the thyristor is positively biased even after the transmission is in gear. Thus the safety device disables the ignition circuit to prevent the engine from starting with the transmission in gear, but once the engine is started the transmission can be shifted into gear without disabling the ignition circuit.

REFERENCES:
patent: 3521612 (1970-07-01), Santi et al.
patent: 3718128 (1973-02-01), Botker
patent: 3726265 (1973-04-01), Howard
patent: 3827540 (1974-08-01), Bolinger et al.
patent: 4033311 (1977-07-01), Burson
patent: 4172394 (1979-10-01), Kudo et al.

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