Hall effect type sensor off-car

Hall effect type sensor which enables the ECU to know the position of the camshaft and also tells ECU where the reference point (TDC) is .
It only consists of 3 major parts , Magnet, steel chopper plate, Hall integrated IC.
As the window (gap) in the plate comes between the magnet and Hall integrated IC which are only milimeters apart it creates voltage a digital signal . Depending on the manufaturer the primary Ignition is depended on the sensor . dwell time could be when the gap between the magnet and Hall IC is blocked and the fireing time when there is a window between the magnet and Hall IC... therefor this signal is vital for this types of engine to even start.