Patent ID: 6664789
Filing Date: 2003-12-16
Classification: F02P

Abstract:
An ignition timing device for timing an engine having a timing port and a timing mark indicative of a position of a movable member, the ignition timing device comprising:a sensor adapted to be secured in the timing port to provide a timing mark signal indicative of presence of the timing mark; an ignition sensor adapted to provide an ignition signal indicative of the occurrence of an ignition spark; a filter receiving the ignition signal and providing a filtered ignition signal, the filter filtering ignition sparks of compression strokes from ignition sparks of compression and exhaust strokes of a selected cylinder to provide the filtered ignition signal; a delay element receiving the filtered ignition signal and providing a delayed signal having a selected delay from the filtered ignition signal; a comparator receiving the timing mark signal and the delayed signal, the comparator providing an output signal indicative of substantial simultaneous occurrence of the timing mark signal and the delayed signal; and an indicator receiving the output signal and operable as a function thereof.