Difference between a hydraulic power steering (HPS), electric powered hydraulic steering (EPHS), & fully electric power steering (EPS)

These steering systems makes it easier for the driver to control the steering wheel when driving.
...

 HPS

  • Uses hydraulic pressure to assist motion of steering wheel
  •  Has an hydraulic pump
  •  Pump is driven by power from the engine with the aid of a belt (serpentine)
  •  Steering is hard when engine stops/fails

EPHS

  •  A hybrid of hydraulic and electric
  •  Has an hydraulic pump
  •  Pump driven by power from an electric motor. No belt needed.
  •  Steering is hard when engine stops/fails

 EPS

  • Electric motor replaces hydraulic pump
  • Has an electric motor attached to the steering rack or steering column
  • No hydraulic fluid
  • No power steering belt
  • Steering is not affected by engine stalling or failure

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