Electronic ignition timing

Details Electronic ignition timing Electronic ignition timing

1982-11-10

1984-04-24

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123414, 123427, F02P 504

Patent

active

044441711

ABSTRACT:
A motorcycle two cylinder asymmetric ignition timing system includes an electronic ignition advance circuit. A spark advance control signal is derived from a base signal which in turn has a magnitude that is representative of the time duration between spark ignition signals and thus is representative of engine speed. The spark is not advanced at engine speeds up to 300 RPM, is advanced 9.degree. between 300 RPM and 800 RPM and is advanced 16.degree. above 800 RPM. Intersection between a ramp signal which has a duration that is an inverse function of engine speed and a base signal that has an amplitude which is an inverse function of engine speed determines the time at which the ignition signal is generated. The lower the base signal, the sooner the intersection of the ramp with the base signal and thus the earlier the ignition signal. In this fashion the desired advance is attained.

REFERENCES:
patent: 4104997 (1978-08-01), Padgiet
patent: 4276860 (1981-07-01), Capurka
patent: 4307691 (1981-12-01), Nagac et al.
patent: 4367712 (1983-01-01), Sugiura
patent: 4380983 (1983-04-01), Kobashi et al.
patent: 4389989 (1983-06-01), Hastig
patent: 4407246 (1983-10-01), Bayama

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