Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation

Audi 80/Avant
+ The description
+ Engines
+ System of release of the fulfilled gases
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and воздухозаборные channels
+ Injection system
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Antiblocking system of brakes
+ Wheels and tyres
+ Kuzovnaja electrosystem
- Ignition system
   Various systems of ignition
   Principle of work of ignition
   Executive office
   System "brain"
   Impulses for the management block
   Regulation on a detonation
   Security measures at work with ignition system
   Repair of system of ignition
   Diagnostics of system of ignition
   The ignition distributor
   The gauge of detonation combustion
   High voltage elements
   Replacement of spark plugs
   Spark plugs
   Check of the moment of ignition
+ Illumination
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
+ Specifications


Impulses for the management block

The open distributor of ignition (on an example of the 4-cylinder engine):

1 – the Hall gauge;
2 – замыкатель;
3 – the connecting tip of the gauge of the Hall.

The Hall gauge is located at the 6-cylinder engine far behind behind the left head of the block of cylinders:

1 – the case of the gauge of the Hall;
2 – the connecting tip.

The Hall gauge

The inclusion mentioned in last section and current deenergizing to the ignition coil is provided (passing also through the block of management and the electronic switchboard – about it more low) the gauge of the Hall which is located at models with 4 and 5-cylinder engines in the ignition distributor, and at models with 6-cylinder engines behind at the left head of the block of cylinders.

Its name has not something in common with the big halls, etc., and it is connected with a name of an opener of effect of the Hall used at work of this gauge.

The Hall gauge is located below in the case of the distributor and consists of following elements: замыкателя (trigger) with 4, 5 or 6 dredging (depending on number of cylinders), a constant magnet and actually integrated scheme of the Hall located opposite to it. All together functions approximately as the photorelay, but here instead of light magnetic waves operate.

It becomes completely evident if we imagine an automatic door of the lift. If you rise in an aperture and will interrupt a ray of light, the lift door remains opened. As soon as you have departed and have opened to light road, the door mechanism obtains the order on closing.

Let's return to ignition system: if in a magnetic field there is a plate замыкателя the Hall gauge passes a current to the management block. If the plate leaves a backlash between the integrated scheme of the Hall and a constant magnet a food to the management block does not arrive. It also is the impulses operating ignition.

 The help: dredging in замыкателе the distributor are located in such a manner that a power-current impulse, for example, at the 4-cylinder engine, gets to the management block for 60 to ВМТ. In this time the management block counts the optimum moment of ignition on the basis of the information on number of turns of the engine (by means of sequence of impulses of a power-current) and loadings on the engine (by means of indicators of resistance of a flowmeter of air, a potentiometer throttle заслонки or the pressure gauge in an inlet collector).

The gauge of number of turns of the engine and the gauge of the moment of ignition

Models with 6-cylinder engines

In addition to the Hall gauge 6-cylinder engines are equipped by the gauge of number of turns/frequencies of rotation of the engine and the gauge of the moment of ignition. Both are so-called inductive gauges.

The gauge of frequency of rotation works as follows: in the gauge there is a coil and a magnet. They are supplemented with gear inflow on a flywheel behind on a cranked shaft. Each time when under the gauge takes place a tooth, a magnetic field of a constant magnet changes, and in the coil pressure is created. It is enough this small signal for processing in the block of management of systems of injection MPI/MPFI. The information on number of turns of a cranked shaft Thus arrives.

To fix exact position of a cranked shaft, on one certain place of a flywheel the steel pin has been established. If it passes under the gauge, there is the pressure peak, which block of management uses for position definition.