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Collision Warning Systems

Collision Warning Systems. Kristin Poland, Ph.D. Collision Warning Systems (CWS). Radar based Track other vehicles and stationary objects Prevent rear-end collisions Provide light and sound warnings Moving versus stationary objects. Stationary Object Detection.

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Collision Warning Systems

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  1. Collision Warning Systems Kristin Poland, Ph.D.

  2. Collision Warning Systems (CWS) • Radar based • Track other vehicles and stationary objects • Prevent rear-end collisions • Provide light and sound warnings • Moving versus stationary objects

  3. Stationary Object Detection

  4. Perception/Reaction Times and CWS • At 70 mph: • 350 feet warning = 3.4 seconds • 220 feet warning = 2.1 seconds • Average driver reaction time is around 1.5 seconds • Time for brake pedal application and full brake system pressurization (0.5 seconds) • At 70 mph, 2.0 seconds = 205 feet • Ideal brakes, longest warning time • Impact speed = 48.5 mph • Existing brakes, 220 feet warning time • Impact speed = 68.8 mph

  5. Active Braking CWS • Acura RL • Adaptive cruise control (ACC) • Active braking collision warning systems controls vehicle automatically • Benefits may be huge: • Ideal brakes, longest warning time • Impact speed = 0 mph

  6. Vehicle Stability and CWS • Collision warning systems • Severe evasive maneuvers • Vehicle instability • Hard braking on slippery surface • Rapid steer maneuver • Stability control system • Roll and directional control

  7. Summary • Collision warning systems • Potential to enhance commercial vehicle safety • Reduced effectiveness at highway speeds with stopped vehicles • Active braking collision warning systems • Electronic stability control (ESC)

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