Audi A4, S4
since 2000 of release
Repair and car operation
Audi A4, S4
+ Governing bodies and receptions of safe operation
+ Current leaving and service
+ Systems of cooling, heating and air conditioner
- Power supply systems, release and decrease in toxicity of the fulfilled gases
+ Power supply systems of petrol and diesel engines
+ System of injection of fuel of the petrol engine
+ System of injection of fuel of the diesel engine
- Systems of release and decrease in toxicity of the fulfilled gases. Turbokompressor
Removal and installation of system of release. Replacement of the central, additional exhaust silencer, trailer pipe
Correction of laying of system of release / trailer pipe
Systems of decrease in toxicity of release - the general information
Removal and installation of the catalytic converter and lambda probes
Turbokompressor - the general information and precautionary measures
Interkuler - the general information
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Automatic transmission
+ Coupling, power shafts and differential
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
The catalytic converter has the central ceramic part of a cellular design-3-covered with a layer of the carrier. On a layer of the carrier there are the salts of precious metals operating as converters. The catalytic converter is fixed in the case-1-by means of the insulating basic layer-2-compensating at the same time thermal expansions of the catalytic converter (address to an illustration the Arrangement of elements of system of injection in a compartment of the diesel engine of 2.5 l).
To reduce by means of the catalytic converter harmful emissions, systems of injection should dose out precisely amount of the injected fuel necessary for combustion. The lambda probe is in a reception pipe in front of the catalytic converter and is washed by a stream of the fulfilled gases. The lambda probe represents the electronic sensor measuring the content of oxygen in final gases and representing its type of fluctuations of tension. Information from a lambda probe is transferred to the control unit of system of injection. The received value allows to regulate structure of an air-petrol mix. On the one hand it is necessary, as service conditions (the idling, full gas), on the other hand, constantly change as optimum reburning of fuel in the catalytic converter occurs only in this case if final gases contain fuel enough.
That in the catalytic converter there was a fuel reburning, it is necessary to have temperature 300 - 800°С. For this purpose the bigger content of fuel in a mix, than for pure burning is necessary.
The catalytic converter of the petrol engine represents the so-called three-functional device. In adjustable process of transformation oxidation of an oxide of carbon (WITH) and hydrocarbon (NANOSECOND), and also reduction of concentration of oxides of nitrogen (NOx) is carried out.
Security measures for an exception of damages of the catalytic converter
For an exception of damages a lambda probe and the catalytic converter it is necessary to fulfill the following requirements:
Petrol and diesel engines