Audi 80/Avant (B4)
since 1991-1995 of release
Repair and car operation
+ Technical specification
+ System of production of the fulfilled gases
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
- Injection system
- System of injection of Mono-Motronic
Malfunctions and independent diagnostics
Check of separate elements
Check of a mode of idling and analysis of exhaust gases
Check of catalytic converter and lambda probe
Hummock drive of "gas"
List of malfunctions
+ System of injection of Digifant
+ System of injection of KE-III-Jetronic
+ Systems of injection of MPI and MPFI
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrosystem
+ ignition System
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
System of injection of Mono-Motronic
Function chart of system of injection of Mono-Motronic
Central injectionThe smallest Audi engine is equipped with system of injection of gasoline through one nozzle and a butterfly valve, so-called system Mono-Motronic. It consists generally of the case similar to the case of the carburetor and supplied with the one and only vpryskny nozzle. The fuel exit from a nozzle is regulated by the electronic control unit which at the same time provides management of regulation of an advancing of ignition.
It is located in feet of the forward passenger in front of the heating channel and via the multicontact tip receives information from the following knots:
Processing entering signals the control unit counts duration of opening of a vpryskny nozzle with an electromagnetic drive and by that amount of injected fuel. Thus the control unit uses multiparameter characteristics of the engine – the file in which all possible conditions of the engine are written down. In the same place in the form of electric signals data relating to this or that situation on amounts of fuel are written down. In addition in the form of characteristics in Mono-Motronic indicators of the moments the ignitions relating to amount of fuel and an operational situation are kept.
It is located at the very bottom of the block of preparation of gas mixture and regulates amount of air which the engine should receive.
Block of preparation of gas mixture
The majority of details of the central system of injection of gasoline are collected in this case. Through it passes arriving air, and here – by means of a nozzle – fuel, as well as in the carburetor is added.
It opens by means of an electromagnet. Thus fuel can arrive – or not – depending on a signal from the control unit. For optimum dispersion of fuel the nozzle is supplied with slanted final openings through which gasoline gets on a conic wall of a final opening, завихряясь there.
The sensor of temperature of arriving air
It is located sideways on the case of a nozzle and thus can precisely define the air temperature, preparation of gas mixture arriving in the block.
The fuel pump under pressure submits gasoline to a regulator of pressure which provides intake of gasoline to a nozzle under the same pressure 0,8 – 1,2 bar. For this purpose he allows a most or smaller part of gasoline to go back to a fuel tank on the drain highway. Giving via the fuel filter remains almost constant.
Regulator of provision of a butterfly valve
The small electric motor with angular transfer moves a driving pusher closer or farther from an emphasis of idling of a butterfly valve. Thus, depending on a situation the butterfly valve can open on big or smaller size.
Butterfly valve potentiometer
He reports to the control unit about movements of a butterfly valve and its situation. So, for example, fast opening of a butterfly valve is distinguished as car acceleration. If you clean a foot from an accelerator pedal, the signal of closing of a butterfly valve activates fuel interruption of supply in an idling mode. The message passes in a type of an electric signal – the potentiometer represents not that other as variable resistance.