Distributorless Ignition System (DIS) – Main Components, Working with Application

Distributorless Ignition System (DIS) – Main Components, Working with Application

Main Components

The parts of this ignition system are identical to the electronic ignition system, but in this scheme there is no distributor, the parts used are-
1. Battery: The battery is used as the DIS power house just like the electronic ignition scheme.

2. Ignition Switch: it controls the ignition system's ON and OFF, as well as the electronic ignition scheme.

3. A full installation of ignition coils and module is used in Distributorless ignition scheme to create the scheme smooth and less complex.
  • Ignition coils: Unlike an electronic ignition system that utilizes a single ignition coil to produce high voltage, DIS utilizes a amount of ignition coils, i.e. each coil per spark plug, which generates high voltage for each spark plug separately.
  • Ignition Control Module (ICM) or Ignition Control Unit: the programmed instruction provided to the chipset is accountable for the ON or OFF environment of the primary coil panel,
4.  Magnetic Triggering Devices: These are the systems used to regulate the timing of the spark plug by detecting the location of both the crankshaft and the camshaft, a magnetic triggering device consisting of a teeth triggering wheel and a sensor, two magnetic triggering instruments used in the Distributorless ignition system.
  • Camshaft Triggering Device: Camshaft mounted and used for valve timing monitoring.
  • Crankshaft Triggering Device: mounted on the crankshaft to detect the location or stroke of the piston.
5. Spark Plug: It is used in the cylinder to produce spark.

Working of Distributorless Ignition System

  1. When the ignition switch is switched on, the electricity from the battery statistics flows through the ignition switch to the electrical control unit (which continues to process information and calculate timing) of the car linked to the ignition module and the coil assembly (which produces and breaks the loop).
  2. The ignition units installed on the camshaft and crankshaft spaced the teeth similarly with one gap, and the location detectors consisting of the magnetic coil that constantly produces magnetic field as the camshaft and crankshaft rotate.
  3. When these holes occur in front of the placement devices, there is a fluctuation in the magnetic field and the signals from both detectors are sent to the ignition module, which in turn notices the waves and the present continues to flow in the main winding of the coils. When these holes are removed from the detectors, the signals from both detectors are sent to the ignition module, which switches the curre ON.
  4. This ongoing signal making and breaking generates magnetic current in the coils, which in turn induces EMF in the secondary coil winding and raises the voltage up to 70,000 volts.
  5. This high voltage will then be sent to the spark plugs and flames will be generated.
  6. By continually handling the information obtained from the ignition control module, the timing of the spark plugs is governed by the electronic control unit.


(i) Nearly all vehicles with 1.8 L, 2.8 L VR6 AND 2.8 L V-6 engines on the highway have been using this scheme since a century now.

(ii) DIS is used for the first time in Volkswagen Passat's 2.8 L VR6 engine.

(iii) This scheme is also adopted by some high-end bicycles such as Ducati super sports.

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