ENGINE TECHNOLOGY TO CONFORM EXHAUST GAS EMISSION
ENGINE TECHNOLOGY TO CONFORM EXHAUST GAS
EMISSION
About Engine Technology
This engine technology combines a Komatsu Diesel Oxidation Catalyst (KDOC) and Komatsu’s Urea Selective
Catalytic Reduction (SCR) to conform EU Stage IV emission regulation in the European Union.
• Komatsu Diesel Oxidation Catalyst (KDOC): The system makes possible to eliminate the need for regener-
ation and simplifies the engine control system.
• Komatsu’s Urea SCR system: A device which decomposes the toxic nitrogen oxides (NOx) mixed in the
exhaust gas into harmless nitrogen and water. Spraying the reagent (Diesel Exhaust Fluid) into the exhaust
gas produces a reaction between the nitrogen oxides and ammonia generated from the urea solution and
decomposes the nitrogen oxides into nitrogen and water.
About Diesel Exhaust Fluid (DEF)
Diesel Exhaust Fluid is the reagent for the SCR system.
DEF is the abbreviation for Diesel Exhaust Fluid, and is represented as DEF throughout this manual.
DEF is a colorless transparent and aqueous urea solution made with 32.5 % urea (AUS32) and 67.5 % deion-
ized water. Urea as main constituent is a material which is used for cosmetics, medical and pharmaceutical
products, and fertilizer, etc.
Commercial DEF, commonly referred to as AdBlue
®
in the European Union, that quality standards are main-
tained in accordance with DIN70070 and ISO 22241-1, to be used.
AdBlue
®
is a registered trade-mark of VDA (Verband der Automobilindustrie e.V.: Automobile Association of
Germany).
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