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
   + System of injection Mono-Motronic
   + System of injection Digifant
   + System of injection KE-III-Jetronic
   + Systems of injection MPI and MPFI
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Antiblocking system of brakes
+ Wheels and tyres
+ Kuzovnaja electrosystem
+ Ignition system
+ Illumination
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
+ Specifications

Injection system

System of injection Mono-Motronic

Function chart of system of injection Mono-Motronic

 

In drawing the atomizer (2) with even connected tip (1), (3) blocks of preparation of a gas mixture taken from a nest is shown впрыскная. Sideways on the valve the fuel strainer is visible.


The disassembled regulator of pressure:

1 – a cover;
2 – a spring;
3 – a membrane;
4 – a basic surface.


The regulator of position throttle заслонки (1) can be removed separately. It is necessary, if is faulty приводной a pusher of the switch of a signal of idling (2). The position (3) designates a persistent bolt throttle заслонки.


The potentiometer throttle заслонки is established and regulated at factory and it cannot be assorted. We only have removed it to show you sliding contacts and spending paths. In case of malfunction it is necessary to replace the block of preparation of a gas mixture.

The central injection

The smallest engine Audi is equipped by system of injection of gasoline through one atomizer and throttle заслонку, so-called system Mono-Motronic. It consists basically of the case similar to the case of the carburettor and supplied one and only впрыскной with the atomizer. The exit of fuel from an atomizer is regulated by the electronic block of management which simultaneously provides management of regulation of an advancing of ignition. In more details about system Mono-Motronic you learn in the head ignition System.

Basic elements

The management block

It is located in the field of feet of the forward passenger in front of the heating channel and through the multicontact tip receives the information from following knots:

  • The Hall gauge in the ignition distributor – about frequency of rotation of the engine.
  • Ljambda-probe in каталитическом neutralizer – about the maintenance of residual oxygen in the fulfilled gases.
  • Potentiometer – about position throttle заслонки and by that quantity of arriving air.
  • The gauge of temperature of arriving air on an input of the block of preparation of a gas mixture – about temperature of arriving air.
  • The temperature gauge on a branch pipe of a cooling liquid at the left on a head of the block of cylinders – about temperature of a cooling liquid.

Processing entering signals the management block counts duration of opening впрыскной atomizers with an electromagnetic drive and by that quantity of injected fuel. Thus the management block uses многопараметровые engine characteristics – a file in which all possible conditions of the engine are written down. In the same place in the form of electric signals data concerning this or that situation on quantities of fuel are written down. In addition in the form of characteristics in Mono-Motronic indicators of the moments the ignitions concerning quantity of fuel and an operational situation are kept.