Diesel Exhaust Fluid (DEF) is an aqueous urea solution blended with 32.5% high purity urea and 67.5% deionized water. DEF solution is used in Selective Catalytic Reduction (SCR) to lower NOx concentration in the exhaust emissions of diesel engines.
The solution may also be referred to as AUS32 or as AdBlue, a trademark held by the German Association of the Automobile Industry (VDA), which ensures quality standards are maintained in accord with ISO 22241 specifications.
0.079 2 ... Fuel Rail Pressure (diesel, or gasoline direct inject) 0 655,350 kPa (gauge) ((A*256)+B) * 4 ... O2S1_WR_lambda(1) Equivalence ... Commanded EGR and EGR Error 01 6A 5 Commanded Diesel intake air flow control and relative intake air flow position 01 6B 5 Exhaust gas recirculation temperature 01 6C 5. 9 ... Exhaust Gas temperature (EGT) Bank 2 Special PID ...
... DEF is stored in a tank on board the vehicle, and injected into the exhaust stream by a metering system at a rate of 2% of diesel consumption volume (4-6% in Europe) ... This low dosing rate ensures long fluid refill intervals and minimises the tank's obtrusion into vehicle packaging space ... An Electronic control unit adjusts the addition of fluid in accord with such parameters as engine operating temperature and speed ...
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