Diesel Exhaust Aftertreatment Systems

The video tutorial explains the after treatment systems for Tier 4 Final EU Stage 4C 9.32 C18 engines with assert technology. It covers the components and functions of the Cat Regeneration System, Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF), and Selective Catalytic Reduction (SCR) system. The DOC converts nitric oxide into nitrogen dioxide and oxidizes carbon monoxide and hydrocarbons. The DPF captures particulate matter and regenerates using engine exhaust heat. The SCR system uses DEF to convert NOx into nitrogen and water, while the AMOX manages excess ammonia.

What are the main components of the after treatment system for Tier 4 Final engines?

• Cat Regeneration System, Diesel Oxidation Catalyst, Diesel Particulate Filter, Selective Catalytic Reduction System

• Turbocharger, Exhaust Gas Recirculation, Fuel Injector, Air Filter

• Cooling System, Oil Filter, Fuel Pump, Air Compressor

• Alternator, Battery, Starter Motor, Radiator

What is the primary function of the Diesel Oxidation Catalyst (DOC)?

• To convert nitric oxide into nitrogen dioxide and oxidize carbon monoxide and hydrocarbons

• To store diesel exhaust fluid

• To inject diesel exhaust fluid

• To capture particulate matter

What happens to carbon monoxide in the Diesel Oxidation Catalyst?

• It is captured as soot

• It is converted into carbon dioxide

• It is stored in a tank

• It is converted into nitrogen

What is the result of hydrocarbons reacting with oxygen over the DOC?

• Formation of carbon dioxide and water

• Formation of ammonia

• Formation of nitrogen and water

• Formation of soot

How does the Diesel Particulate Filter (DPF) remove soot?

• By converting it into nitrogen and water

• By storing it in a tank

• By capturing it in a wall flow filtering element and regenerating using engine exhaust heat

• By using a chemical reaction with ammonia

What role does the SCR mixing tube play in the after treatment system?

• It injects DEF into the exhaust stream, converting it into ammonia

• It captures particulate matter

• It stores diesel exhaust fluid

• It oxidizes carbon monoxide

Which component is responsible for converting NO and NO2 into nitrogen and water?

• SCR Catalyst

• Diesel Oxidation Catalyst

• Ammonia Oxidation Catalyst

• Diesel Particulate Filter

What is the function of the DEF controller in the SCR system?

• To store diesel exhaust fluid

• To capture particulate matter

• To control the quantity of DEF injected into the exhaust stream

• To oxidize carbon monoxide

What is the purpose of the Ammonia Oxidation Catalyst (AMOX)?

• To convert excess ammonia into nitrogen and water

• To inject diesel exhaust fluid

• To capture soot and ash

• To oxidize hydrocarbons

Why is a small amount of excess DEF injected into the exhaust stream?

• To increase engine power

• To capture more soot

• To reduce fuel consumption

• To ensure sufficient NOx reduction