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Which sensor does an electric power steering system need?

  • A.A torque sensor on the column
  • B.A position sensor at the rack, which measures the travel and therefore determines the assistance to be applied
  • C.A pressure sensor
  • D.A wheel speed sensor at each wheel, which allows the assistance to be reduced as the road speed becomes greater

Answer: A

The torque sensor measures the effort the driver is applying and the controller assists in proportion, which is the fundamental input. Vehicle speed is used to shape the assistance curve but is secondary. Position sensing supports the automated functions. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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