Explain how Exhaust Gas Recirculation (EGR) systems reduce NOx emissions in diesel engines.

EGR systems reduce NOx emissions by recirculating a portion of the exhaust gas back into the combustion chamber, which dilutes the intake air and lowers the combustion temperature, reducing the formation of NOx.

Describe the process by which Diesel Particulate Filters (DPF) remove particulate matter from diesel engine exhaust.

Diesel Particulate Filters (DPF) capture particulate matter (soot) from the exhaust stream. The trapped particulate matter is then periodically burned off (regenerated) at high temperatures.

How do Selective Catalytic Reduction (SCR) systems convert NOx into harmless substances?

SCR systems inject a urea-based reductant (DEF or AdBlue) into the exhaust stream. The reductant reacts with NOx in the presence of a catalyst, converting NOx into harmless nitrogen and water.

What is the primary benefit of using Ultra Low Sulfur Diesel (ULSD) fuel in diesel engines?

ULSD fuel contains significantly less sulfur than traditional diesel fuel, which reduces the formation of sulfur dioxide (SO2) during combustion, a contributor to acid rain.

Diesel Emission Control Technologies Lesson Plan for Grade 11th Grade

Lesson Preview

Learning Objective

I can evaluate the effectiveness of different diesel emission control technologies in reducing air pollution.

1
Exhaust Gas Recirculation (EGR) systems reduce NOx emissions by recirculating exhaust gas, which lowers the combustion temperature.
2
Diesel Particulate Filters (DPFs) capture particulate matter, which is then burned off at high temperatures to maintain clean exhaust.
3
Selective Catalytic Reduction (SCR) systems inject a urea-based reductant to convert NOx into harmless nitrogen and water.

Diesel Emission Control Technologies

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Learning Objective

Warm-Up Video

Key Concepts

Practice Questions

Exit Ticket

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