MECHANICAL TIME DILATION ALGORITHM FOR COLLISION AVOIDANCE SYSTEM

  • US 20090326774A1
  • Filed: 05/15/2009
  • Published: 12/31/2009
  • Est. Priority Date: 06/26/2008
  • Status: Active Grant
First Claim
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1. A method for providing limited braking for an automatic vehicle braking system to prevent a collision, said method comprising:

  • monitoring collision threats on a subject vehicle;

    estimating a collision risk value between the subject vehicle and an object;

    calculating a closing speed between the subject vehicle and the object;

    calculating a distance to collision between the subject vehicle and the object;

    calculating a time to collision between the subject vehicle and the object;

    determining whether the collision risk value is greater than a first predetermined threshold;

    providing full automatic braking of the subject vehicle if the collision risk value is greater than the first predetermined threshold;

    determining whether the collision risk value is greater than a second predetermined threshold if the collision risk value is less than the first predetermined threshold;

    determining whether the collision risk value is greater than a third predetermined threshold if the collision risk value is greater than the second predetermined threshold, where the third predetermined threshold is between the first and second predetermined thresholds;

    calculating a time dilation deceleration value;

    estimating a projected closing speed of the subject vehicle to the object;

    determining whether the time dilation deceleration value is greater than a predetermined deceleration threshold;

    providing automatic braking to decelerate the vehicle to a full stop if the time dilation deceleration value is greater than the deceleration threshold; and

    automatically braking the subject vehicle to decelerate the subject vehicle at the time dilation deceleration value if the time dilation deceleration value is not greater than the deceleration threshold.

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