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Which purpose does a lock-up clutch serve?

  • A.It eliminates converter slip to improve fuel economy
  • B.It increases the torque multiplication, which improves the acceleration of the vehicle from a standing start
  • C.It permits the engine to idle
  • D.It protects the converter from overheating, which occurs when the vehicle is driven at a low speed on a gradient

Answer: A

Even at cruise a converter slips a few per cent, wasting fuel as heat, so a friction clutch locks the turbine to the cover. Multiplication is lost, which is why it engages only at steady speed. It typically saves several per cent of fuel. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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