Operation of the TSZ-H transistorized ignition system

The hall-sensor transistorized ignition system is a non-contact ignition system. Instead of breaker contacts, a Hall sensor is installed in the ignition distributor, which does not require maintenance. An ignition capacitor is not required here. The Hall sensor consists of a non-contact magnetic core and a disc fixed on the axis of the ignition distributor, the signals from the Hall sensor are sent to the control unit, determining the moment the ignition coil is turned on and off. Thus, the Hall sensor determines the moment of ignition. When the disk enters the air gap in the magnetic core, it interrupts the magnetic field in the integrated circuit (hall chip). The Hall sensor turns on the ignition current. When the disk leaves the air gap of the magnetic core, the current in the ignition coil is turned off and ignition occurs.

The control unit of the transistorized ignition system regulates the closing angle by supplying voltage to the ignition coil only for the time necessary to saturate the primary winding. This reduces power losses in the control unit and the ignition coil.

To prevent overheating of the control unit and the ignition coil, the control unit removes the voltage supply to the ignition coil when the ignition is on and the engine is not running after about 1 second.

To ensure safety, the ignition coil has a 5.5 mm hole with a plug. It serves to purposefully allow the flooding mass to flow out of the ignition coil in the event of a failure of the transistor ignition system.