Active Front Wheel Steering System (AFS) - PowerPoint PPT Presentation

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Title:

Active Front Wheel Steering System (AFS)

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Active Front Wheel Steering System (AFS) Chapter 2 Conventional Steering System Rack and pinion system Constant steering ratio Fully mechanical system AFS Wheel steer ... – PowerPoint PPT presentation

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Tags: afs | active | front | steering | system | wheel

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Title: Active Front Wheel Steering System (AFS)


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

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

3
(No Transcript)
4
AFS
  • Wheel steer angle superposition of steering
    wheel
  • angle and AFS actuator
  • Variable steering ratio
  • Combination of mechanical and electrical systems

5
Vehicle Handling Model (without side wind force)
6
Vehicle Handling Model (with side wind force)
7
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

8
Controller Structure of AFS
9
Wind model
10
Performance Comparison of AFS and non-AFS vehicles
11
Yaw Rate
AFS
Non-AFS
12
Lateral acceleration
13
Simulation Data
  • m3950
  • Iz6172
  • Lf1.1
  • Lr1.36
  • Cf71600
  • Cr77130
  • Vx20
  • Lw0.4
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