Audi 80/Avant (B4)

since 1991-1995 release

Repair and operation of the car


Audi 80/Avant
+ Technical specification
+ Engines
+ System of production of the fulfilled gases
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ System of injection
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrical system
- System of ignition
   Various systems of ignition
   Principle of work of ignition
   Executive body
   "Brain" of system
   Impulses for the control unit
   Regulation on a detonation
   Security measures during the work with system of ignition
   Repair of system of ignition
   Diagnostics of system of ignition
   Ignition distributor
   Sensor of detonation combustion
   Elements of a high voltage
   Replacement of spark plugs
   Spark plugs
   Check of the moment of ignition
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications




Principle of work of ignition

If to construct the chart of dependence of a corner of an advancing on loading and number of turns of the engine, the so-called characteristic of ignition will turn out. Than stranny its form looks, more precisely ignition is coordinated by that with the corresponding operational situation of the engine.

  • The basic principle of ignition consists that current from the battery arrives at first on primary winding of the coil of ignition.
  • This winding consists of several rounds of a thick wire. Under the influence of a current round the iron core in the coil of ignition there is a powerful magnetic field – the energy coming to system for ignition.
  • If the piston comes nearer to a point in which the arrived and compressed mix has to ignite – to the ignition moment, – current in the coil of ignition interrupts. It occurs at the command of the control unit in the electronic switchboard of system of ignition.
  • At shutdown of current the magnetic field in the coil of ignition interrupts. Thus there is a following: in the secondary winding consisting of very large number of rounds of a thin wire there is an impulse of a high-tension current size in some tens of thousands of volts.
  • This secondary tension of system of ignition arrives via the distributor (at models with the 6-cylinder engine directly) on that spark plug which sequence approached in an operating procedure of cylinders of the engine. Mix ignites, the engine is turned further. The electrochain becomes isolated, process repeats.