×

Ultrasonic detection system for safety of vehicle passengers

  • US 5,764,136 A
  • Filed: 06/23/1997
  • Issued: 06/09/1998
  • Est. Priority Date: 03/27/1996
  • Status: Expired due to Fees
First Claim
Patent Images

1. An ultrasonic system for use in monitoring a danger zone of a vehicle, said system comprising:

  • one or more transducers;

    circuit means for analog to digital signal conversion of acoustic echoes of signals from said transducers and to provide digital information corresponding to said acoustic echoes; and

    a processor programmed for controlling said transducers, said processor programmed to, upon receiving said digital information corresponding to a sequence of digitized acoustic echoes from said circuit means for analog to digital conversion;

    a) generate from said information, an initial reference data set representing a pattern of distances, the pattern of distances corresponding to echoes received as reflections from objects at plurality of locations in the danger zone from said one or more transducers;

    (b) establish and store said initial reference data set representing objects detected in said danger zone when said vehicle becomes stationary,(c) monitor a subsequent sequence of digitized acoustic echoes received from said transducers,(d) generate from said subsequent sequence of digitized acoustic echoes a second data set representing a pattern of distances, the pattern of distances corresponding to echoes receieved as reflections from objects at plurality of locations from said one or more transducers;

    (e) compare said second data set with said initial reference data set and,(f) return an alarm output if a variation greater than a predetermined value between said initial reference data set and said second data set is detected.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×