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Which weakness of laboratory cycles did such testing address?

  • A.Inaccuracy of the measuring equipment, which could not measure the emissions of a modern engine with sufficient precision
  • B.None
  • C.Calibrations tuned to recognise and perform well within the cycle while behaving differently under real conditions
  • D.Optimisation of the calibration for the test alone

Answer: D

Strategies could be tuned for the narrow conditions of the test and behave otherwise on the road. The last option describes exactly that practice, which makes it a correct and more explicit statement of the same weakness. The order in which the effects act is what decides the outcome, so it is worth establishing first. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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