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Which recirculation rate does a diesel engine commonly use?

  • A.About five per cent, which is the maximum a compression ignition engine is able to tolerate at any load
  • B.None
  • C.A large proportion at light load, falling to little or none at full load where the oxygen is needed for the fuel
  • D.Up to around half the charge at part load

Answer: D

Diesel recirculation rates can exceed forty per cent at light load. The last option explains the load dependence, which makes it a correct and more instructive version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared behaviour explains why these belong together and the differences explain why both exist. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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