ENGINE TECHNOLOGY TO CONFORM EXHAUST GAS
EMISSION
About Engine Technology
This engine technology combines a Komatsu Diesel Particulate Filter (KDPF) and Komatsu’s Urea Selective
Catalytic Reduction (SCR) to conform EPA Tier4 Final emission regulation in North America.
• Komatsu Diesel Particulate Filter (KDPF): A device which captures diesel particular matter or soot in the
exhaust gas to purify exhaust gas. If soot is accumulated to a certain level in the filter, a purification process
to burn the soot is performed automatically to keep the filtering performance of KDPF high.
• 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 aqueous urea solution 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, that is API (American Petroleum Institute) certified and fulfills the quality requirements in ac-
cordance with ISO 22241-1, is to be used. The certified DEF has the API DIESEL EXHAUST FLUID Certifica-
tion Mark shown as follows. Look for the API DEF Certification Mark when purchasing DEF.
API Diesel Exhaust Fluid Certification Mark is the trade mark of
API (American Petroleum Institute).
FOREWORD
ENGINE TECHNOLOGY TO CONFORM EXHAUST GAS EMISSION
1-7
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