Control circuit for ignition coil

Details Control circuit for ignition coil Control circuit for ignition coil

1996-10-25

1997-11-25

Dolinar, Andrew M.

Internal-combustion engines

High tension ignition system

Current or voltage sensing in coil primary

315209T, 315224, F02P 305

Patent

active

056900856

ABSTRACT:
An ignition coil control circuit for controlling a current flowing to a primary coil of an ignition coil, comprises a switching circuit for switching the primary coil of the ignition coil, a driving circuit for driving the switching circuit, a control signal output circuit for generating and outputting a driving control signal to the driving circuit in accordance with a signal from an ECU, and a current limiting circuit for detecting a value of the current fed to the primary coil by the switching circuit and controlling the switching circuit to make the current value not larger than a predetermined value and wherein the control signal output circuit uses the signal from the ECU as its power source, and the current limiting circuit uses a switching driving signal output from the driving circuit for driving the switching circuit as its power source.

REFERENCES:
patent: 4899715 (1990-02-01), Koiwa et al.
patent: 5199407 (1993-04-01), Sawawzaki et al.

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