Mercedes S-Class W-220

since 1998 of release

Repair and car operation



W220 Mercedes
+ Mercedes-Benz Cars of a class S (W220)
+ Operation manual
+ Routine maintenance
+ Engine
+ cooling and heating Systems
- Power supply system and release
   + Power supply system and fuel injection
   + System of injection of fuel of the diesel engine. Turbokompressor
   - Systems of release and decrease in toxicity of the fulfilled gases
      Systems of decrease in toxicity of release - the general information
      System of production of the fulfilled gases
      Catalytic converter
+ engine Electric equipment
+ Automatic transmission
+ Power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ electric equipment Cхемы











Systems of release and decrease in toxicity of the fulfilled gases

Systems of decrease in toxicity of release - the general information

Elements of systems of decrease in toxicity

1 — the Control lamp «Check the engine»
2 — the Diagnostic socket

3 — the Valve of a purge of a coal adsorber


Scheme of laying of vacuum lines. V6 and V8 engines (112, 113)

1 — the Valve of a purge of an adsorber
2 — Diafragmennoye the device of switching of the inlet pipeline
3 — the Actuating unit of a butterfly valve
4 — the Resonant valve of switching of the inlet pipeline
5 — the Valve of an otsechka of a podmeshivaniye of air in an exhaust with the built-in control valve
6 — the Valve of system of a retsirkulyatsiya of the fulfilled gases (EGR)

7 — the Vacuum transmitter of EGR system
8 — To other consumers of depression
9 — the Vacuum control valve
10 — the Electric vacuum pump
11 — the pressure Sensor
12 — the Valve of switching of the air pump


Arrangement of elements of systems of decrease in toxicity

1 — Right dokataliticheskiya a lambda probe 1
2 — Right post-catalytic a lambda probe 2
3 — the pressure Sensor in a fuel tank
4 — the Valve of a purge of an adsorber

5 — the Adsorber of system of catching паров fuels
6 — Left dokataliticheskiya a lambda probe 1
7 — Left post-catalytic a lambda probe 2


Function chart of system of catching паров fuels

55 — the Fuel filter
55/2 — the Regulator of pressure of fuel of 5.0 atm.
55/3 — the Regulator of pressure of fuel of 5.3 atm.
55/3a — Zaslonka
55/4 — the razbryzgivaniye Chamber
71 — the Valve
75 — the Fuel tank
76 — the Ventilating valve
77 — the Coal adsorber
77/1 — the pressure/depression Line
95 — the Pump of pumping of a mix

B4/7 — the Sensor of pressure of fuel
M3 — the Fuel pump
M3/1 — the Pump which has been built in a fuel tank
N3/10 — the Control unit electronics
the phased injection of fuel (ME-SFI)
Y58/1 — the Valve of management of an adsorber purge
a — the Fuel line
b — the purge Line
c — Elektroprovodka


The electric pump of system of a podmeshivaniye of air in an exhaust

The valve of a zaslonka of switching of release (under the bottom)

The valve of switching of the pump of system of a podmeshivaniye of air in an exhaust (a forward part of the engine)

Valve of management of a purge of a coal adsorber (the left back part of an impellent compartment)

The transmitter of vacuum of the valve of a retsirkulyatsiya of the fulfilled gases (back part of the engine)


Petrol models

In power supply systems of all petrol models only unleaded gasoline should be used. The control system of the engine functions so that to receive the maximum return from the engine at the minimum fuel consumption and toxicity of the fulfilled gases. The catching system паров fuels prevents hit them from a fuel tank in the atmosphere. The system of a retsirkulyatsiya of the fulfilled gases is established.

System of ventilation of a case

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).

Decrease in toxicity of the fulfilled gases

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 optimum concentration of oxygen in the fulfilled gases there is a jump in tension on the sensor. This jump is a reference point for the control unit at correction of quality of a mix.

It is established on two sensors. One - before, and the second — after the converter. It reaches more exact tracking of composition of the fulfilled gases.

System of a retsirkulyatsiya of the fulfilled gases

The system of a retsirkulyatsiya of the fulfilled gases allows to reduce quantity of NOx 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.

Catching system паров fuels

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 of a purge (Y58/1) 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.

The control valve in the line of a purge prevents pressure increase in an adsorber. The purge of an adsorber joins in the following cases:

- the temperature of cooling liquid is more 70°С;
- the engine works more long than 2 mines;
- not at movement nakaty;
- a lambda probe it is not active.

Regulation of force of a purge is carried out by the control unit. The size of replenishment of an adsorber is defined by various time of inclusion at continuous opening and valve closing. Changes of speed of rotation of a cranked shaft at a purge are prevented by management of single turns.

At an open cover of a fuel tank the ventilating valve does not open, therefore the final opening is closed quicker and prevents fuel hit in an adsorber.

Diesel models

The control system of the engine functions so that to receive the maximum return from the engine at the minimum fuel consumption and toxicity of the fulfilled gases. For additional decrease in toxicity of gases on the car some additional 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

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). On all diesel models the ventilation valve is established. It is on a cover of a head of the block and operates a stream of gases from a case.

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, WITH and other harmful impurity which are a part of fulfilled gases.

System of a retsirkulyatsiya of the fulfilled gases

On all diesel models the system of a retsirkulyatsiya of the fulfilled gases is also established. This system allows to reduce quantity of NOx 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 is supervised by the control unit.