BMW 5 Series Owners & Service Manuals

BMW 5 Series: Functional principle

An emergency avoidance maneuver takes place when a suddenly occurring obstacle is detected in front of the vehicle and the driver has to avoid this obstacle quickly and without "significant" braking.

Evasion Aid supports the driver in avoidance maneuvers in emergency situations and calculates an optimum "escape track" past the obstacle.

The "escape track" is calculated within the physical limits of the particular vehicle. The calculated "escape track" is designed to minimize transverse dynamics.

Evasion Aid
G30 Evasion Aid

The vehicle is preconditioned before an anticipated avoidance maneuver.

Here all functions that contribute to stabilize the vehicle are adapted in their configuration for the maximum support of the driver. This can reduce the risk of unstable vehicle behavior or overloading the driver in an acute avoidance maneuver.

Evasion Aid checks the current vehicle inclination and the driver's steering wheel actions and compares the information with the computed "escape track". Should the system detect discrepancies, an appropriate steering intervention is applied to steer the vehicle to the previously estimated "escape track".

The design objective for the system was that the driver's selected steering is not bypassed, but instead the feel of the steering wheel use is modified. The driver is supported by an additional support torque in the Electronic Power Steering (EPS) for the avoidance maneuver.

If a collision-threatening situation is detected and an acute warning has been issued, Evasion Aid evaluates the traffic situation.

The possible free space for an avoidance maneuver is analyzed on the basis of this critical situation.

Radar sensors and the KAFAS stereo camera monitor the vehicle's surroundings. The system can intervene to provide support if an avoidance opportunity next to the vehicle in front is available and if no collision object has been detected to the side of the own vehicle.

The system assists the driver in the speed range from 25 - 100 mph (40 to 160 km/h).

The driver initiates the avoidance maneuver by turning the steering wheel rapidly, at the same time determining the avoiding direction. Any brake intervention initiated by the acute warning is aborted or suppressed as appropriate. The Electronic Power Steering (EPS) implements a supporting steering intervention.

The vehicle is made "more agile" by the system as it steers around the obstacle and then stabilized again when it reaches the escape lane.

Rapid and effective avoidance is possible thanks to the vehicle's improved response to steering commands, without endangering the general driving stability.

Evasion Aid
G30 Evasion Aid: make agile/stabilize

  1. Make agile
  2. Stabilize

The hard shoulder may be used as the escape lane, in addition to a normal lane.

The supporting steering intervention by the system is not performed until after the driver has actively initiated the avoidance maneuver. An avoidance maneuver by Evasion Aid alone is thus not performed.

The driver must likewise determine the direction of the avoidance.

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    Below we describe which main components or sensors are relevant to Evasion Aid. Object or obstacles are detected by means of the KAFAS stereo camera and the ACC Stop&Go front radar sensor.

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