Contactless ignition system device (Opel Kadett E)

The electronic ignition system includes a distributor ignition sensor with a built-in contactless sensor (pulse generator sensor), a commutator and a high energy ignition coil.

Like the distributor of the contact ignition system, the distributor sensor of the electronic ignition system has a centrifugal and vacuum ignition advance regulator. The contactless sensor assembled with the support plate has the ability to rotate depending on the vacuum supplied to the vacuum regulator.

The switch converts the pulses coming from the contactless sensor into current pulses in the primary winding of the ignition coil. The switch consists of a surge protection cascade, an excitation cascade (preamplification) and a final stage, implemented on a Darlington diode, which functions as a chopper.

The switch is connected to the pulse generator (contactless sensor) three conductors.

To prevent overloading of the ignition system, the final stage of the switch is switched off approximately 1 second after the ignition is switched off, if the starter is not switched on during this time. The circuit is restored when the starter is switched on.

The ignition coil, adapted to this ignition system, is installed next to the commutator. The ignition coil has a hole in the upper part, closed with a plug of 5.5 mm diameter to protect the coil from excessive internal pressure. The plug is pushed out of the hole when the pressure increases due to an increase in temperature due to a short circuit in the final stage of the commutator or when the current cut-off circuit is faulty when the engine is not running.