Operation Description

The following performance is gained by controlling the best front wheel steering angle and the rear wheel steering angle.

• The desirable vehicle movement is gained toward the driver's steering angle operation (steering angle).
• The steering gear ratio changes according to the vehicle speed. The steering wheel operation (steering angle) load decreases.
• In SPORT mode, the steering characteristics of the front and rear wheels are switched to reduce load of steering wheel operation (steering angle) more than that in STANDARD mode and enable smooth motion.
  NOTE:

  • When driving at low speed: In SPORT mode, make front steering wheel operation (steering angle) increase more than that in STANDARD mode.
  • When driving at high speed: In SPORT mode, make rear steering wheel operation (steering angle) decrease more than that in STANDARD mode.
  Fig 1: Front Steering Gear Ratio Versus Vehicle Speed Graph (With And Without 4WAS)

  Courtesy of NISSAN NORTH AMERICA, INC.

When Driving at Low Speed

Increased front wheel angle gains the optimum front wheel angle by minimum steering wheel operation (steering angle).

Fig 2: Steering, Front And Rear Wheel Angle Versus Time Graph (When Driving At Low Speed)

Courtesy of NISSAN NORTH AMERICA, INC.

When Driving at Middle Speed

Increase the front steering angle while controlling to turn the rear wheel steering angle to the same steering angle side of steering wheel operation (steering angle). these operations make response better for vehicle yaw rate/lateral acceleration and also decrease the angle of sideslip.

Fig 3: Steering, Front And Rear Wheel Angle Versus Time Graph (When Driving At Middle Speed)

Courtesy of NISSAN NORTH AMERICA, INC.

When Driving at High Speed

Decrease the front wheel steering angle while controlling to turn the rear wheel steering angle to the same steering angle side of steering wheel operation (steering angle). these operations make car response better and vehicle stability higher.

Fig 4: Steering, Front And Rear Wheel Angle Versus Time Graph (When Driving At High Speed)

Courtesy of NISSAN NORTH AMERICA, INC.