MTU 6R 1000 series Instruções de Operação descarregar pdf (Página 22)

Functions of the exhaust gas aftertreatment

control unit (ACM):

R

Evaluation of sensor signals

The sensor signals of the directly connec-

ted sensors are evaluated. Data provided

via the CAN by the engine management

control module (MCM) and the control

units for the NOx sensors are also evalu-

ated.

R

AdBlue

®

/DEF injection

Calculation of the required amount of

AdBlue

®

/DEF and supply of AdBlue

®

/DEF

by actuation of the SCR delivery pump.

Injection by actuation of the AdBlue

®

/DEF

metering unit.

Exhaust gas aftertreatment

The exhaust gas aftertreatment system is

activated immediately after the engine is star-

ted and remains activated during engine

operation. It ensures that the pollutant emis-

sions in the exhaust gas are reduced to the

limits stipulated in the emissions standard.

Exhaust gas treatment is carried out by:

R

selective catalytic reduction (SCR) with

ammonia slip catalytic converter

R

the diesel oxidation catalytic converter

(DOC)

In order to ensure correct operation of the

exhaust gas aftertreatment system, only

operate the engine/vehicle with the AdBlue

®

reducing agent. AdBlue

®

is not refilled as part

of the maintenance work. You should there-

fore top up the AdBlue

®

tank regularly your-

self.

Operating the vehicle/equipment without

AdBlue

®

or with another, non-Mercedes-Benz

or non-MTU approved medium, invalidates

the engine's operation certification/

approval.

Exhaust gas recirculation

Exhaust gas recirculation (EGR) serves pri-

marily to reduce the amount of nitrogen oxide

prior to exhaust gas aftertreatment. This

serves to comply with emissions limits.

Exhaust gas is added to the fresh air being

drawn in or charged so that the concentration

of oxygen in the combustion mixture is

reduced. Combustion deteriorates if the con-

centration of exhaust gas in the combustion

mixture is too high. The emission of soot par-

ticles, carbon monoxide (CO) and hydrocar-

bons (HC) increases. Conversely, the emis-

sion of nitrogen oxides (NOx) would increase,

if the concentration of fresh or charged air

was too high.

Warning and indicator lamps

Important safety notes

If you ignore warning and indicator lamps, you

will not be able to recognise failures and mal-

functions in components or systems. Driv-

ing/braking characteristics may be different

and the operating and road safety of your

vehicle/equipment may be limited. Have the

affected system checked and repaired at a

qualified specialist workshop. Always

observe the warning and indicator lamps and

follow the corresponding corrective actions

(Y page 36).

Overview

The display format for warning and indicator

lamps is vehicle-specific/equipment-spe-

cific. Observe the information contained in

the Operating Instructions for the vehicle/

equipment. The symbols listed below are

examples and may differ from those symbols

displayed in the vehicle/equipment.

In the event of a fault or warning, a warning

lamp or indicator lamp lights up automati-

cally. Depending on the priority of the fault or

20

Warning and indicator lamps

At a glance

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