Software design includes: writing programs of rotate speed computing module, ignition timing computing module and ignition control module and curve fitting.

In this system the crankshaft rotating Angle, where the peak combustion pressure occurs, is taken to be a feed back signal, so that the ignition timing of the engine is able to be controlled.

Ignition timing devices. The contact points must be timed to close and open in proper relation to the piston positions in the cylinders.