Mercedes-Benz G-class (W463) since 1999 of release
1. Introduction
2. Governing bodies and operation receptions
3. Current leaving and service
4. Engine
5. Systems of cooling, heating, ventilation and air conditioning
6. A power supply system and production of the fulfilled gases
6.1. General information and security measures
6.2. Power supply system of petrol engines
6.3. Power supply system of diesel engines
6.4. Systems of release and decrease in toxicity of the fulfilled gases
6.4.1. General information
6.4.2. Removal and installation of system of production of the fulfilled gases
6.4.3. Removal and installation of final collectors
6.4.4. Removal and installation lambda probes
6.4.5. Removal and installation of the air pump
6.4.6. Removal and installation of the valve of a purge of a coal adsorber (EVAP)
6.4.7. Removal and installation of a coal adsorber (EVAP)
6.4.8. Removal and EGR valve installation
6.4.9. Removal and installation of a cooler of EGR
6.4.10. Removal and installation of pozitsioner of EGR
6.4.11. Removal and installation of the sensor of temperature of cooling liquid (CDI)
7. Systems of electric equipment of the engine
8. Automatic transmission
9. Transmission line
10. Brake and auxiliary systems
11. Suspension bracket and steering
12. Body
13. Onboard electric equipment
14. Schemes of electric connections


 







6-4-1-obshhaya-informaciya.html

6.4.1. General information

General information

Release system

Within regenerative repair each section of system of production of the fulfilled gases can be replaced in an individual order.

System of decrease in toxicity of the fulfilled gases

Petrol models

In power supply systems of all petrol models only unleaded gasoline should be used!

The principle of functioning of a control system of the engine is constructed so that to receive the maximum return from the engine at the minimum fuel consumption and the maintenance of toxic components in the fulfilled gases. The system of catching of fuel evaporations prevents hit of last of a fuel tank in the atmosphere. The system of a retsirkulyatsiya of the fulfilled gases is established also.

System of operated ventilation of a case (PCV)

For elimination of leakages of not burned down hydrocarbons in the atmosphere the engine completely загерметизирован. Gases and pairs of oil which are forming in a case, via the mesh filter get to the inlet pipeline and burn down in cylinders together with fuel.

Gases are removed from a case at the expense of a pressure difference in a case and the inlet pipeline (pressure in a case is higher).

System of a retsirkulyatsiya of the fulfilled gases (EGR)

The system of a retsirkulyatsiya of the fulfilled gases allows to reduce quantity of NO X in the fulfilled gases. For this purpose the small part of the fulfilled gases moves in the inlet pipeline via the special valve. The valve of system of a retsirkulyatsiya copes the control unit.

System of catching of fuel evaporations (EVAP)

For decrease in emission in the atmosphere of not burned down hydrocarbons on all petrol models the system of catching of fuel is established. The refueling mouth of a fuel tank is tightly closed by a cover, under a fuel tank the coal adsorber is established. In it pairs of fuel which are forming in a tank during parking of the car gather and are stored there until on a signal of the control unit the filter purge will not begin. Then pairs of fuel start to move via the valve (ы) purges in the inlet pipeline, there they mix up with a working mix and further burn down usually in combustion chambers.

For ensuring normal operation of the engine on single turns and during warming up the control unit holds the valve the closed. Thus hit of not burned down fuel in the converter (is prevented at the raised turns of idling a mix переобогащена). After engine warming up the valve starts to open and be closed, submitting pairs of fuel to an inlet path.

Catalytic converter and lambda probes

For decrease in number of harmful emissions the three-functional catalytic converter is built in the atmosphere on all petrol models in system of release. The control system of injection of fuel has feedback in which the oxygen sensor is switched on. This sensor established in system of release, constantly informs the control unit on composition of the fulfilled gases. Depending on the received data, the control unit corrects quality of the mix submitted to chambers of combustion and, thus, optimizes fuel combustion.

In a lambda probe the heating element which is switched on by the control unit through the special relay is built in. The working surface a lambda probe is sensitive to change of the content of oxygen in gases. Depending on concentration of oxygen, the sensor sends signals of different tension. If the mix переобогащена - the content of oxygen in the fulfilled gases very low, the sensor submits signals with a low voltage. Tension increases in process of pauperization of a mix and increase in the content of oxygen in gases. Most effectively the converter works at optimum composition of gas mixture (14.7 parts of air for 1 part of fuel). At change of concentration of oxygen in the fulfilled gases near optimum value there is a sensor power surge. This jump is a reference point for the control unit at correction of quality of a mix.

Two sensors are established: one - before, and the second - after assembly of the catalytic converter. It reaches more exact tracking of composition of the fulfilled gases.

Diesel models

The same requirements are put in a basis of principles of functioning of a control system of the diesel engine, as at petrol units. For additional decrease in toxicity of gases on the car some auxiliary systems are established. The system of ventilation of a case reduces leakages of gases in the atmosphere from system of greasing of the engine. The catalytic converter reduces toxicity of the fulfilled gases. The system of a retsirkulyatsiya of the fulfilled gases is established.

System of operated ventilation of a case (PCV)

For elimination of leakages of not burned down hydrocarbons in the atmosphere the engine completely загерметизирован. Gases and the oil evaporations which are forming in a case of the engine, are passed via the mesh filter, go to the inlet pipeline and are burned in cylinders in the course of normal functioning of the engine

Removal of karterny gases is carried out at the expense of a difference of pressure in a case and the inlet pipeline.

Catalytic converter

For decrease in number of harmful emissions the catalytic converter is built in the atmosphere on all diesel models in system of release. It will neutralize the most part of gaseous hydrocarbons, carbon monooxide (WITH) and other toxic impurity containing in products of combustion of an air and fuel mix.

System of a retsirkulyatsiya of the fulfilled gases (EGR)

On all diesel models the system of a retsirkulyatsiya of the fulfilled gases which main objective is decrease in percentage in products of combustion of the engine of oxides of nitrogen (NOX) is also established. For the purpose of objective performance the small part of the fulfilled gases from a path of system of release via the special valve will be redirected the inlet pipeline (see also Section General information). Functioning of the EGR valve is supervised by the control unit.


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6.4.2. Removal and installation of system of production of the fulfilled gases