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Which charging strategy saves fuel on a modern vehicle?

  • A.Charging only when the battery voltage falls below a threshold, which minimises the time the alternator is loaded
  • B.Charging hard during deceleration and lightly under load
  • C.Charging at a constant voltage at all times, which is the simplest strategy and imposes a predictable load
  • D.Not charging at all

Answer: B

Recuperation takes energy that would be wasted as heat in the brakes and stores it, which is a form of regeneration available on any vehicle. Threshold charging is a real simple strategy, which makes the last option a plausible alternative approach. The order in which the effects act is what decides the outcome, so it is worth establishing first. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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