Capacitor ignition system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 24, 1991
Grant Date -
N/A
app pub date -
Apr 26, 1990
filing date -
Apr 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A capacitor ignition system for internal combustion engines, particularly for lawn mowers, chain saws, abrasive cutting-off machines, etc., has a magnetic generator for triggering a primary firing pulse generator to charge a capacitor. An electronic switch discharges the capacitor via the primary winding of the ignition coil. The primary pulse generator controls a tachometer to address a stored characteristic ignition field program to thereby provide an rpm-dependent delay in the firing pulse relative to the magnetic generator pulse. The characteristic ignition field program has different advance curves for the same rpm under different operating conditions. A switching-over device monitors the operating state of the engine in order to switch over from a starting igntion advance curve to an operating ignition advance curve and back again. The starting ignition advance curve and operating ignition advance curve overlap in a region of the rpm which has the idling rpm as the upper limit. The lower limit of the operating ignition advance curve is always above the starting ignition advance curve and is set to a value of rpm above the rpm achievable by cranking the engine.
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