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  • Powertrain
  • Chassis
  • Body and Structure
  • Control and Electronics
  • Dynamics and Performance
  • Service
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    • Contact

Active steering systems - HICAS/Super HICAS

11/21/2014

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High Capacity Active Steering (HICAS)
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HICAS development history
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“HICAS” four-wheel steering system
In 1986, Nissan launched their HICAS system on the rear axle of the R31 Skyline Coupe.
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Configuration of HICAS II system
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Principle layout of the E-M SBW 4WS conversion mechatronic control system [NISSAN 1989 -- HICAS]
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Configuration of SUPER HICAS system
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General arrangement of Nissan Super HICAS 4WS system (Nissan Europe)
Super HICAS is controlled by a relatively simple open-loop control system. The desired vehicle path dictated by the driver is determined based on signals from the vehicle’s velocity sensors and the steering wheel angle sensor. The appropriate rear-wheel steer angle is then calculated by the system’s ECU. The ECU then actuates a servo valve, which applies pressure to a spring-centered hydraulic cylinder. The stroke of this hydraulic cylinder pivots the rear wheel to the required angle.
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Nissan continued to develop the HICAS system into the “Super HICAS” four-wheel steering system, which was featured on the Nissan 300ZX and several Infiniti models between 1989 and 1996.
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