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Speed control system for vehicles

  • US 20090093938A1
  • Filed: 09/25/2008
  • Published: 04/09/2009
  • Est. Priority Date: 10/09/2007
  • Status: Active Grant
First Claim
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1. A speed control system for vehicles comprising:

  • a distance detecting means that detects a distance to a preceding vehicle;

    a relative speed detecting means that detects a relative speed between a subject vehicle and the preceding vehicle;

    an evaluation index computing means that computes a corrected distance condition evaluation index which is increased with increase in the relative speed when approaching the preceding vehicle and whose increase gradient becomes greater as the distance to the preceding vehicle becomes shorter at each relative speed as an index indicating the condition of approaching or separating from the preceding vehicle by taking into consideration of a speed of the preceding vehicle;

    an evaluation index threshold value computing means that sets a threshold value of the corrected distance condition evaluation index and takes an offset amount preset with respect to distance as zero value of distance at the threshold value of the corrected distance condition evaluation index;

    a deceleration target checking means that checks whether the corrected distance condition evaluation index is higher than the threshold value of the corrected distance condition evaluation index;

    a target value setting means that, when the corrected distance condition evaluation index is higher than the threshold value of the corrected distance condition evaluation index, sets the threshold value of the corrected distance condition evaluation index as a target value of the corrected distance condition evaluation index;

    a target deceleration computing means that computes the target deceleration of the subject vehicle based on a target relative speed corresponding to the target value set by the target value setting means and an actual relative speed; and

    a controlling means that starts deceleration control to decelerate the subject vehicle so that deceleration of the subject vehicle becomes equal to the target deceleration.

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