Presentation
EATS (Exhaust Aftertreatment
System)
EATS (Exhaust Aftertreatment System) is used to
reduce emissions. In the SCR-system (Selective
Catalytic Reduction) AUS (Aqueous Urea
Solution)/DEF (Diesel Exhaust Fluid) are added to the
exhaust gases before they pass through the catalytic
converter.
Sensors measure nitrogen oxide (NOx) levels in the
exhaust gases before and after the catalyst. Based on
the input from the sensors, 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.
AUS/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 urea (the
solution must meet ISO 18611 or ISO 22241). 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.
IMPORTANT:
The use of solution that do not fulfill the ISO 18611 or
ISO 22241 standard will compromise the
aftertreatment system performance. Any warranty
claims will be rejected.
Monitoring
The system is monitored to ensure that all system
components are working as they should, that the
quality of the AUS fulfills set standards and that the
tank level is not too low. Should the system detect
deviations a warning signal will be given and a fault
code stored in the control unit.
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