Ignition control apparatus for internal combustion engine

Details Ignition control apparatus for internal combustion engine Ignition control apparatus for internal combustion engine

2006-08-22

2006-08-22

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C123S630000, C361S093800

Reexamination Certificate

active

07095182

ABSTRACT:
An ignition control apparatus for an internal combustion engine of the present invention has a switching circuit and a control circuit. The switching circuit includes a first switch controlling a main current constituting the most portion of the coil current, a second switch controlling a sensing current constituting the coil current together with the main current; and a temperature sensor detecting temperatures of the first and the second switches, which are realized by semiconductors. The control circuit, which is heat-isolated from the switching circuit, includes a current limiting circuit operating the first switch and the second switch to adjust the coil current to a predetermined value based on the sensing current, and a thermal shutoff circuit turning off both the first switch and the second switch when the temperature detected by the temperature sensor exceeds a predetermined threshold value.

REFERENCES:
patent: 4077379 (1978-03-01), Jundt et al.
patent: 5309884 (1994-05-01), Fukui et al.
patent: 5494016 (1996-02-01), Okumura et al.
patent: 5664550 (1997-09-01), Ito et al.
patent: 6684867 (2004-02-01), Ito et al.

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