Aftertreatment basics

Front

Exhaust pressure build-up in the exhaust system. The pressure can be before or after the turbocharger.

Back

Exhaust Backpressure

Front

Identify the location of the DPF.

Back

B

Front

A process in which soot is burned inside the DPF through supplemental heating of the DPF.

Back

Active Regeneration

Front

A device installed in the exhaust system to filter out black carbon soot and other particulates from the exhaust.

Back

DPF

Front

A process where relatively low-temperature chemical reactions take place in the exhaust catalyst to oxidize soot into CO2 and H2O.

Back

Passive Regeneration

Front

Identify the location of the DOC.

Back

A

Front

The primary purpose of a ______ is to remove soot and other solid particles from diesel exhaust, rendering the exhaust completely smokeless.

Back

DPF

Front

An exhaust aftertreatment system that decomposes NOx molecules using ammonia NH3.

Back

SCR

Front

In a heavy-duty diesel SCR exhaust system, where are the NOx sensors located? Options: Before the PDF and Before the DOC, After the turbocharger and after the SCR, After the DOC and after the SCR, Before the DOC and Before the SCR

Back

After the turbocharger and after the SCR

Front

A NOx reduction technology that mixes exhaust gases with fresh intake air.

Back

EGR