Audi 80/Avant (B4)
Since 1991-1995 of release
Repair and car operation
+ The description
+ 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
Malfunctions and independent diagnostics
Check of separate elements
Check of a mode of idling and the analysis of exhaust gases
Check каталитического neutralizer and a ljambda-probe
Trosovyj drive of "gas"
The list of malfunctions
+ System of injection Digifant
+ System of injection KE-III-Jetronic
+ Systems of injection MPI and MPFI
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Antiblocking system of brakes
+ Wheels and tyres
+ Kuzovnaja electrosystem
+ Ignition system
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
System of injection Mono-Motronic
Function chart of system of injection Mono-Motronic
The central injectionThe 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.
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:
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.
It is located at the very bottom of the block of preparation of a gas mixture and regulates quantity of air which the engine should receive.
The block of preparation of a gas mixture
The majority of details of the central system of injection of gasoline are collected in this case. Through it passes arriving air, here again – by means of an atomizer – fuel, as well as in the carburettor is added.
It opens by means of an electromagnet. Thus fuel can arrive – or not – depending on a signal from the management block. For optimum dispersion of fuel the atomizer is supplied by oblique final apertures through which gasoline gets on a conic wall of a final aperture, завихряясь there.
The gauge of temperature of arriving air
It is located sideways on the case of an atomizer and thus can is exact define temperature of air arriving in the block of preparation of a gas mixture.
The fuel pump under pressure submits gasoline to a regulator of pressure which provides gasoline receipt to an atomizer under the same pressure 0,8 – 1,2 bar. For this purpose he allows большей or smaller part of gasoline to leave back in a fuel tank on a drain highway. Giving through the fuel filter remains almost constant.
Regulator of position throttle заслонки
The small electric motor with angular transfer moves приводной a pusher more close or further from an emphasis of idling throttle заслонки. Thus, depending on a situation throttle заслонка can open on the big or smaller size.
Potentiometer throttle заслонки
He informs the management block on movements throttle заслонки and its position. So, for example, fast opening throttle заслонки is distinguished as car acceleration. If you clean a foot from an accelerator pedal the signal of closing throttle заслонки activates a fuel stopping delivery in an idling mode. The message passes in a kind of an electric signal – the potentiometer represents not that other as variable resistance.