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Active Front Wheel Steering System (AFS)

Active Front Wheel Steering System (AFS). Chapter 2. Conventional Steering System. Rack and pinion system Constant steering ratio Fully mechanical system. AFS. Wheel steer angle = superposition of steering wheel angle and AFS actuator Variable steering ratio

joan-blackburn
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Active Front Wheel Steering System (AFS)

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  1. Active Front Wheel Steering System (AFS) Chapter 2

  2. Conventional Steering System • Rack and pinion system • Constant steering ratio • Fully mechanical system

  3. AFS • Wheel steer angle = superposition of steering wheel • angle and AFS actuator • Variable steering ratio • Combination of mechanical and electrical systems

  4. Vehicle Handling Model (without side wind force)

  5. Vehicle Handling Model (with side wind force)

  6. Assumptions in modeling and control AFS • S Fx = 0 (No braking or throttle inputs) • Fyf = Cf af • Fyr = Cr ar Where Cf = cornering stiffness of front tires Cr = cornering stiffness of rear tires a = wheel side slip angle

  7. Controller Structure of AFS

  8. Wind model

  9. Performance Comparison of AFS and non-AFS vehicles

  10. Yaw Rate AFS Non-AFS

  11. Lateral acceleration

  12. Simulation Data • m=3950 • Iz=6172 • Lf=1.1 • Lr=1.36 • Cf=71600 • Cr=77130 • Vx=20 • Lw=0.4

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