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Which provision does a steer by wire system require for safety?

  • A.A mechanical backup column, which engages automatically if the electronic system detects a fault within itself
  • B.A larger motor
  • C.A hydraulic accumulator, which stores sufficient pressure to steer the vehicle to a halt if the supply should fail
  • D.Redundant sensors, actuators and power supplies

Answer: D

With no mechanical path the electronics must not fail, so every element is duplicated or triplicated and the system degrades gracefully. A mechanical backup would defeat the purpose of the layout. Aircraft fly by wire practice is the model. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking which component actually carries the load settles most questions of this kind at once.

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