×

Facility for intermittent transmission of information between guideway wayside equipment and vehicles moving along the guideway

  • US 4,550,444 A
  • Filed: 10/19/1983
  • Issued: 10/29/1985
  • Est. Priority Date: 10/24/1980
  • Status: Expired due to Fees
First Claim
Patent Images

1. A facility for intermittent inductive transmission of information between a guideway and vehicles moving along said guideway comprising:

  • a wayside portion adjacent said guideway including a binary data transmitter and an energy receiver having a first single series resonant circuit tuned to a first freqency coupled thereto, said first resonant circuit including an energy receiving antenna; and

    a vehicle carried portion including a binary data receiver to receive data from said data transmitter on only a single predetermined frequency modulated channel, said data being in serial binary form frequency modulated on said predetermined frequency modulated channel, said predetermined channel having a second frequency different than said first frequency representing a binary "1" and a third frequency spaced from said first and second frequencies representing a binary "0" to convey said data therein, said vehicle-carried portion further including an energy transmitter having a second single series resonant circuit tuned to said first frequency coupled thereto, said second resonant circuit including an energy transmitting antenna to transmit energy to said energy receiving antenna when said vehicle-carried portion approaches said wayside portion, said energy transmitter maintaining a current in said transmitter antenna coupled thereto at a constant value, said vehicle-carried portion further including a threshold sensor circuit having a predetermined threshold value, said sensor circuit being coupled to said energy transmitter and sensing any voltage across said energy transmitting antenna in excess of said threshold value when said energy receiving antenna reacts with said energy transmitting antenna to cause said energy transmitter to transmit sufficient energy to power said data transmitter, said data transmitter transmitting said data to said data receiver when the distance between said two portions becomes smaller than a predetermined critical distance, said energy received by said energy receiving antenna being used at least in part to power said data transmitter.

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