RPM Hall Effect Crank or Cam position sensor:
This sensor provides the ECU information about the position of the crank and Cam shaft and in relation with the TDC . ECU would know which cylinder is in which cycle and where abouts are they in their stroke cycles by this sensor input and the TDC reference mark . It produces a digital signal same as the above and also dtermines the dwell time of the primary circuit and also the firing period . as the engine RPM rises the frequency increase and dwell time and firing preiod decreases.
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