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AEBS/LDWS-11-17 20110126

Advanced Emergency Braking System Justification for EVSC as Obligation (illustrated on Kamm’s Circle). AEBS/LDWS-11-17 20110126. AEBS: Necessity of EVSC equipment Forces at wheel. Source: BMW Group. AEBS: Necessity of EVSC equipment Influence of combined forces. Source: BMW Group. µ-low.

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AEBS/LDWS-11-17 20110126

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  1. Advanced Emergency Braking SystemJustification for EVSC as Obligation (illustrated on Kamm’s Circle) AEBS/LDWS-11-17 20110126

  2. AEBS: Necessity of EVSC equipment Forces at wheel Source: BMW Group

  3. AEBS: Necessity of EVSC equipment Influence of combined forces Source: BMW Group

  4. µ-low µ-high AEBS: Necessity of EVSC equipment Influence of combined forces only lateral forces  vehicle controllable only forces based on deceleration  vehicle controllable resultant force extends beyond the friction threshold (outer circle)  vehicle under instable conditions

  5. µ-low µ-high AEBS: Necessity of EVSC equipment Influences of EVSC AEBS/LDWS-11-17 20110126 resultant force inside of thresholds  vehicle controlled by EVSC EVSC interv. • Justifications supporting EVSC • Where ABS simply brakes the wheels such to avoid wheel locking, the EVSC is able to brake the wheels separately to turn an unstable situation into a stable situation. • Where an ABS simply decelerates the vehicle, the EVSC is able to reduce the yaw rate and hence increase the vehicle stability • Where an ABS simply brakes the wheels “blindly” of a tractor/trailer combination, the EVSC is able to improve combination stability by “stretching” the combination • Vehicles fitted with only AEBS + ABS could fulfil the AEBS requirements in the approval test conditions, but would decrease the vehicle stability when trying to achieve the same performances in emergency conditions in the real world. Vehicles fitted with AEBS + ABS + EVSC could mitigate the braking distances in emergency conditions in the real world but would improve the vehicle stability hence avoid additional danger to the other road users (jack-knife and roll-over are avoided).

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