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Which regenerative braking limitation applies to an electric vehicle?

  • A.Regeneration falls off as the battery approaches full charge
  • B.Regeneration is unavailable above a certain road speed, which is why friction brakes are needed at high speeds
  • C.It cannot be blended
  • D.Regeneration is unavailable in reverse, which means the friction brakes must supply the whole effort in that direction

Answer: A

A full battery cannot accept charge, so the control system must blend in the friction brakes to maintain the deceleration the driver expects. Cold batteries impose the same limit. Blending is precisely what the brake control system does. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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