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Which strategy regenerates a petrol particulate filter?

  • A.Oxygen reaching the filter during overrun at high temperature
  • B.A post injection of fuel, which raises the temperature within the filter and therefore burns away the soot
  • C.No regeneration is needed
  • D.A separate heater within the filter, which raises the temperature to the point at which the soot ignites in oxygen

Answer: A

Petrol exhaust is already hot, so overrun fuel cut supplies the oxygen needed to burn the soot passively. Active strategies genuinely exist for difficult duty cycles, which makes the second option a real supplementary measure. The shared behaviour explains why these belong together and the differences explain why both exist. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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