Lecture 14

Question 1

Early Challenges in Car Design

Answer 1

• start motor
• handle on motor
• turn handle would break wrist
• Complicated controls

Question 2

How ABS Works

Answer 2

• Wheel speed is monitored by individual wheel speed sensors
• Notches on rotating disks linked to each wheel provide a sinusoidal signal to the vehicle control systems
• Brake forces are modulated to each wheel to maintain wheel rotation
• Wheel rotation reduces slippage and increases braking potential

Question 3

ABS Case Study Results

Answer 3

• Non-fatal crashes were reduced
• Crashes with pedestrians were reduced
• Fatal crashes were not reduced
• Conclusion was that ABS gave a false sense of security