Cylinder number identification on a distributorless ignition system engine lacking CID

An apparatus for identifying a power stroke of individual cylinders in a multi-cylinder four cycle engine with a wasted spark electronic distributorless ignition system, having pairs of spark plugs which share a common ground and ignition coil, and a crankshaft sensor producing a profile ignition-pickup (PIP) signal and primary coil signal, said engine lacking a camshaft driven cylinder identification sensor, the apparatus comprising:

• a spark sensor, adapted to be placed adjacent to and substantially equidistant from pairs of ignition coil secondary outputs to produce an induced voltage difference signal during each coil firing event;
• and
• a microprocessor, electrically connected to the spark sensor and the crankshaft sensor, the microprocessor including a means for evaluating the induced voltage difference signal, the PIP signal and the primary coil signal, to generate a synthetic cylinder identification signal identifying when a predetermined cylinder is beginning its power stroke.

An apparatus for identifying the polarity of the net voltage spike representing the difference in the magnitude of voltage spikes for a given firing event of a particular pair of cylinders sharing a common coil in a multi-cylinder four cycle engine with a wasted spark electronic distributorless ignition system, having pairs of spark plugs which share a common ground and ignition coil, and a plurality of ignition coils forming a coil pack, the apparatus comprising:

• a spark sensor, adapted to be removably placed in the coil pack adjacent to and substantially equidistant from ignition coil towers on the coil pack, the spark sensor producing an induced voltage difference signal due to a voltage drop differences between spark plugs sharing the same coil.

A coil pack for use in a multi-cylinder four cycle engine with a wasted spark electronic distributorless ignition system, having pairs of spark plugs which share a common ground and ignition coil within a coil pack, the coil pack characterized by:

• a spark sensor permanently mounted within the coil pack adjacent to and spaced substantially equidistant from pairs of ignition coil secondary outputs, the spark sensor having an output for providing an induced voltage difference signal due to voltage drop differences between spark plugs sharing the same coil indicative of which spark plug is in a cylinder having a power stroke.