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Which condition prevents passive regeneration from keeping pace?

  • A.Low load urban driving keeping the exhaust cool
  • B.Motorway driving, during which the filter loads faster than the passive process is able to clear it
  • C.Nothing
  • D.Sustained low temperature operation, since the exhaust never reaches the point at which nitrogen dioxide oxidises soot

Answer: A

Urban driving keeps the exhaust too cool for passive regeneration. The last option explains exactly that, which makes it a correct and more instructive version. Motorway driving is what clears a filter. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The shared behaviour explains why these belong together and the differences explain why both exist. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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