Electronic ignition device

Details Electronic ignition device Electronic ignition device

1979-12-31

1981-11-24

Lall, P. S.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

123415, 123614, F02P 504

Patent

active

043017789

ABSTRACT:
An electronic ignition device for use with an internal combustion engine is coupled between an ignition coil switch and a magnetic pick-up. The pick-up produces a cyclical signal A which is integrated and applied to a first comparator, the other input of which receives a threshold. The comparator output actuates the ignition coil switch. A logic circuit combines the output Z of a zero detector receiving the cyclical signal A with the output of the first comparator. The logic circuit output is integrated to provide a signal R indicative of actual ignition displacement, and which is compared with a signal RS representing the required ignition displacement. In a first embodiment this comparison takes place in a second comparator the output of which is fed back to constitute the threshold input of the first comparator. In a second embodiment the threshold for the first comparator is defined by RS, the signals R and I being combined before application to the first comparator. By means of such control loop variations due to manufacturing tolerances, etc, will not adversely affect spark retardation.

REFERENCES:
patent: 3853103 (1974-12-01), Wahl et al.
patent: 4015566 (1977-04-01), Wahl
patent: 4102311 (1978-07-01), Crall et al.
patent: 4156411 (1979-05-01), Crall et al.
patent: 4257373 (1981-03-01), McDougal et al.

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