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Which advantage does a Hall sensor have over a reluctor?

  • A.Lower cost
  • B.Greater accuracy at high speed, which is required because the reluctor signal becomes indistinct at high frequencies
  • C.A usable signal even at very low cranking speed
  • D.A simpler construction, which requires no supply and therefore reduces the number of wires within the harness

Answer: C

Hall output does not depend on speed, so it works at the slowest cranking. Reluctor output falls away at low speed. The simplicity argument belongs to the reluctor, which needs no supply at all. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Checking which component actually carries the load settles most questions of this kind at once.

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