Vehicle collision alert system

  • US 5,355,118 A
  • Filed: 07/10/1992
  • Issued: 10/11/1994
  • Est. Priority Date: 07/11/1991
  • Status: Expired due to Term
  • ×
    • Pin
First Claim
Patent Images

1. An apparatus for determining an excessive speed approach of a vehicle to an object in front of said vehicle, comprising:

  • a normalized time rate of change detector for determining a normalized time rate of change of a visual angle, (1/θ



    (dθ

    /dt), for said object as viewed from said vehicle, the normalized time rate of change detector including means for measuring a distance D of said vehicle with respect to said object, means for measuring a relative speed Vr of said vehicle with respect to said object, and means for dividing the measured relative speed Vr by the measured distance D to calculate the normalized time rate; and

    an indicator for producing an indication of the excessive speed approach based upon the normalized time rate, said indicator including means for producing a first alarm to indicate a recognition of an excessive approach of said vehicle to said object when the normalized time rate exceeds a first range of 6%±

    1.1%, said first range corresponding to a driver'"'"'s recognition of an excessive approach of said vehicle, and for producing a second alarm indicating danger of a rear-end collision when the normalized time rate exceeds a second range of 12%±

    2.2%, said second range corresponding to a driver'"'"'s recognition of danger of a rear-end collision.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×