Ignition Timing Control (Stationary & Rotary Systems)

Basic triggering of the output (primary on/off) is based on inputs of engine speed and the position of crankshaft. Reference position signal (one pulse per rotation) establishes TDC position of crankshaft by PCM. Engine speed signal is then used to determine exact position of each cylinder for timing control. Ignition timing can then be updated between individual spark plug firings, as needed. This is the basis for all Bosch stationary and rotary systems.