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
+ System of injection Digifant
- System of injection KE-III-Jetronic
Malfunctions and independent diagnostics
Check of separate elements
Search of malfunctions
Removal of components
Check of a mode of idling and the analysis of exhaust gases
The list of malfunctions
+ 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
The scheme of action of system of injection KE-III-Jetronic. Red the fuel is shown, arriving air is allocated light pink.
Kind on the proof-reader of structure of a gas mixture of system of injection KE-III-Jetronic
For the best understanding of full functioning of our system of injection to begin with it is necessary to explain the major details and concepts:
In a final collector in a branch pipe there are two throttle заслонки. Smaller from these заслонок it is connected by a cable of a drive of "gas" with a pedal in salon. It doses out a stream of inlet air in the engine. If the accelerator pedal is squeezed out more strongly draught opens the second, big заслонку. In position of full "gas" both are opened заслонки.
The proof-reader of structure of a gas mixture
It represents the basic component of system of injection and consists of a flowmeter of air and дозатора fuel. They operate so:
Pressure in system
The fuel pump in a fuel tank pumps over fuel under pressure in injection system. The first instance here is the regulator of system pressure in the separate case. It reduces an elevated pressure and leaves for fuel system only from 6,1 to 6,5 bar. This pressure, pressure in system, operates in дозаторе, топливопроводе and впрыскных atomizers.
The pressure regulator is responsible for mix structure. It occurs as follows: fuel receipt to the bottom chambers (through which it is possible to affect quantity of a mix) occurs through a pressure regulator. If it passes a lot of fuel pressure increases in the bottom chambers in the bottom chambers. A consequence: membranes of so-called valves of pressure differences cave in aside клапанных apertures – aside впрыскных atomizers gets less fuel. On the contrary it, of course, operates in the same way.
The pressure regulator receives commands from the management block. It occurs depending on ljambda-regulation, temperature of the engine and loading on it.
As soon as pressure of fuel has reached 4,3—4,6 bar, atomizers submit gasoline to the channel in front of the valve of the corresponding cylinder. Thus they open to 2000 times a second thanks to what gasoline is sprayed is especially thin.
The management block
The management block regulates structure of a mix of the engine through a pressure regulator. That this management on something was based, the management block obtains the data about engine temperature, frequency of rotation, starting processes, position клапанного a shutter (from idling to full loading). Here the ljambda-probe signal, and also the additional data from system of ignition, the gauge of atmospheric pressure and from an automatic transmission is added.
The distributive valve of stabilisation of idling
Function: the valve opens the air channel bypassing throttle заслонки. Effect thus following: because of the increased quantity of air air flowmeter "believes" that throttle заслонка was a little slightly opened, and consequently provides accordingly increased receipt of fuel. Desirable result: increase in frequency of rotation. How many will in addition arrive air, defines the block of management of system of injection KE-III-Jetronic, namely according to frequency of rotation at present time. Thereby electronics aspires to return frequency of rotation in a standard range.
The starting fuel valve
It is an atomizer with an electromagnetic drive which depending on engine temperature at start submits additional quantity of small sprayed fuel to an inlet collector. Duration of injection defines the block of management of system of injection KE-III-Jetronic.
The gauge of angular moving throttle заслонки
In Audi 80 two gauges of angular moving throttle заслонки are mounted. They signal the following data:
Fuel stopping delivery in a mode of compulsory idling (movement накатом)
Already mentioned regulator of pressure stops fuel giving if the car is maintained in a mode of compulsory idling. The management block distinguishes this mode under the information «frequency of rotation above, than frequency of rotation in an idling mode» and «is closed throttle заслонка».