The pulse sensor is located in the direction of travel in front on the right in the engine block, immediately behind the crankshaft belt pulley. The sensor contains a coil and a magnet. The opposite part is formed by a sensor disk equipped with metal teeth. Each time a disc tooth passes under the pulse sensor, the magnetic field of the permanent magnet changes and a voltage is generated in the coil. The dynamo of a bicycle functions in the same way. The control unit calculates the number of revolutions of the crankshaft from the number of voltage pulses.
To determine the ignition timing, the control unit needs information about the position of the crankshaft. To do this, two teeth are missing on the perimeter of the sensor disc. If a hole with missing teeth on the disc passes through the measurement area of the pulse sensor, then for a short moment it stops sending voltage pulses. The control unit receives information about the position of the crankshaft by the brief absence of voltage pulses.
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