Ignition control system

Internal-combustion engines – High tension ignition system – Having dwell control

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Details

1231465A, F02P 900

Patent

active

042757010

ABSTRACT:
An ignition control system typically used with an automobile engine provides tight feedback control on engine timing. An integrator produces a waveform which is typically dual-slope in response to a timing signal supplied by a sensor responsive to rotation of a distributor. A dwell-control circuit produces a dwell-control reference signal which varies with the integrator waveform voltage at low engine speed. A comparator generates an output drive-control signal when the integrator waveform voltage equals or is less than the dwell-control reference voltage. An output drive circuit produces an activation signal in response to the drive-control signal to activate an output drive circuit which then supplies an ignition signal to an ignition coil. A feedback loop between the output drive circuit and the output drive-control circuit causes the output drive circuit to stabilize at a selected state such as a specified output current level. A feedback loop between the output drive circuit and the dwell-control circuit controls the level of the dwell-control reference voltage and thereby controls the dwell period.

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