Discussion
Burning off the soot trapped in a diesel particulate filter is called _____.
Answer: B
Correct answer: regeneration
Regeneration is the periodic burning off of trapped soot, achieved by raising the exhaust temperature - usually by injecting extra fuel that oxidises over an upstream catalyst.
It is necessary because the filter traps continuously and would otherwise block. Passive regeneration occurs whenever the exhaust is hot enough of its own accord; active regeneration is commanded when it is not. Purging refers to the carbon canister, and the other two terms belong elsewhere.
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