Active Front Wheel Steering System (AFS)
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Active Front Wheel Steering System (AFS) Chapter 2
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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 angle = superposition of steering wheel angle and AFS actuator Variable steering ratio - PowerPoint PPT Presentation
Transcript of Active Front Wheel Steering System (AFS)
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
• Combination of mechanical and electrical systems
Assumptions in modeling and control AFS
Fx = 0 (No braking or throttle inputs)
- Fyf = Cf f
- Fyr = Cr r
Where Cf = cornering stiffness of front tires
Cr = cornering stiffness of rear tires
wheel side slip angle