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Method and apparatus for feedback of trainline status to the central processor of a locomotive throttle controller

  • US 5,581,472 A
  • Filed: 11/16/1994
  • Issued: 12/03/1996
  • Est. Priority Date: 11/16/1994
  • Status: Expired due to Fees
First Claim
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1. In an electronically controlled locomotive throttle controller system having a central processor unit and a plurality of trainlines, such trainlines carrying binary voltage signals derived from corresponding binary signals in such central processor unit, a method for transmitting, for a group of such trainlines, herein numbered as NT, such binary voltage signals back to such central processor unit for diagnostic purposes, said method comprising the steps of:

  • (a) applying, for such group of NT trainlines, their such binary voltage signals to a frequency generator which generates a signal having a frequency characteristic of such binary voltage signals, said frequency having a different value for every possible combination of binary signals from such trainlines, said signal being herein referred to as a frequency signal;

    (b) transmitting said frequency signal back to such central processor unit, said transmitting accomplished using one of a wire pair, a wire having reference to a ground common with other circuits, and an optical signal path; and

    (c) processing said frequency signal, in such central processor unit, to recover NT binary signals corresponding to said binary voltage signals on such trainlines in said group of trainlines, and making said binary signals available for diagnostic purposes in said central processor unit.

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