EATS (Exhaust Aftertreatment
System)
EATS (Exhaust Aftertreatment System) is used to
reduce emissions. In the SCR-system (Selective
Catalytic Reduction) the exhaust gases are treated
through
the addition of AdBlue
®
/DEF before they pass
through the catalytic converter. Sensors measure
nitrogen oxide (NOx) levels in the exhaust gases.
The engine control unit calculates the optimum amount
of solution to be added in relation to engine load and
engine speed, to achieve efficient reduction of nitrogen
oxides.
AdBlue
®
/DEF
The solution that is added to the exhaust gases is a
clear, transparent liquid with a faint odor of ammonia;
it consists of de-ionized water mixed with 32.5% urea
(the solution must meet ISO 22241 standards / API
AUS 32). The urea in the exhaust is broken down into
ammonia which reacts with NOx to form harmless
nitrogen and water vapor, which occur naturally in our
surroundings.
The solution is not flammable or harmful to health with
normal use; it is however very corrosive to metals,
especially copper and aluminum.
IMPORTANT:
The use of solution that do not fulfill the ISO 22241
standard will compromise the aftertreatment system
performance, increase emissions.
Any warranty claims will be rejected.
NOTICE! The urea solution has different names in
different markets, e.g. DEF or AdBlue
®
. The solution
is designated either AdBlue or AdBlue/DEF in display
messages.
Monitoring
The system is monitored to ensure that all system
components are working as they should, that the
quality of the AdBlue
®
/DEF fulfills set standards and
that the tank level is not too low. Should the system
detect deviations, the maximum engine torque and
engine speed will be reduced and a fault code stored
in
the control unit. For further information refer to EATS
Inducements, page 48.
Presentation
23
47711083 09-2018 © AB VOLVO PENTA
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