The ignition distributors for all cars are, in principle, the same, with a centrifugal and vacuum regulator. The vacuum chamber is designed to adjust the ignition timing. To improve the composition of exhaust gases at idle and during forced idling (coasting) ignition timing is set in the direction "later". Instead of contacts, the ignition distributor contains a sensor that works according to the induction principle. Depending on the operating conditions of the engine, on the number of revolutions and vacuum, the ignition timing is set in a known manner using centrifugal and vacuum regulators in the ignition distributor.
The rotor made of soft magnetic steel, the number of teeth of which corresponds to the number of cylinders of the engine, during its movement, due to the teeth, causes a change in the magnetic flux in the magnetic field created by the permanent magnet. Because of this, a control voltage arises in an induction coil lying in a magnetic field, depending on the engine speed, ranging from 0.3 to 100 Volts and with a sharp change in positive and negative half-waves. This abrupt reversal of control voltage polarity is used after the zero crossing to generate pulses, amplify the pulses, and open the primary circuit in the switch. When the primary circuit is opened, a high voltage is induced in the secondary of the ignition coil. The control of the closing angle in the switch is coordinated with the flow time of the current in the primary circuit and the number of revolutions of the engine, i.e. with an increase in the number of revolutions, the angle of the closed state also increases and, thereby, a sufficiently high voltage is ensured in the region of high engine speeds.