Over-rotation prevention method and circuit in the non-contact t

Details Over-rotation prevention method and circuit in the non-contact t Over-rotation prevention method and circuit in the non-contact t

1978-05-17

1980-05-27

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123148CC, 123148E, F02P 100

Patent

active

042044901

ABSTRACT:
In a non contact ignition circuit for an internal combustion engine, a current induced in the primary winding or an ignition coil is controlled and cut-off by operation, on and off, of a thyristor so as to produce a discharge in a spark plug. A capacitor connected to the gate of the thyristor is charged with an inverse voltage. When the rotational speed of the internal combustion engine exceeds a predetermined level, i.e. a state of overrotation, the inverse voltage stored in the capacitor is discharged whereby the gate potential of the thyristor is negatively biased relative to the cathode. Accordingly, during the discharging period of the capacitor, the triggering time of the thyristor and sparking are retarded as compared to the normal running condition of the internal combustion engine. Thereby overrotation of the internal combustion engine is prevented.

REFERENCES:
patent: 3356082 (1967-12-01), Jukes
patent: 3809044 (1974-05-01), Jereb et al.
patent: 3828753 (1974-08-01), Reddy
patent: 3958546 (1976-05-01), Ohki et al.
patent: 3964461 (1976-06-01), Wesemeyer et al.
patent: 3967604 (1976-07-01), Kondo
patent: 4014309 (1977-03-01), Nagasawa
patent: 4038951 (1977-08-01), Schweikast
patent: 4079712 (1978-03-01), Nagasawa
patent: 4090488 (1978-05-01), Ohki et al.
patent: 4116188 (1978-09-01), Nagasawa

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