TEST AND DEMONSTRATION OF AUTOMATIC TRAIN CONTROL FOR SAN FRANCISCO BAY AREA RAPID TRANSIT DISTRICT-FINAL REPORT

THIS REPORT DEALS WITH WESTINGHOUSE ELECTRIC CORPORATION'S AUTOMATIC TRAIN CONTROL SYSTEM (BASICALLY A STORED PROGRAM, WAYSIDE-ORIENTED SYSTEM IN WHICH ALL OPERATIONS ARE GOVERNED AND DIRECTED BY HIGH-SPEED DIGITAL PROCESS CONTROLLERS COUPLED TO THE CARS BY COMMUNICATION SYSTEMS AND INTERFACE HARDWARE ITEMS). THE CONTROL SIGNALS, PROVIDING REAL-TIME POSITION INFORMATION FOR EACH CAR FROM WHICH THE CONTROLLER CAN DERIVE SPEED AND ACCELERATION, ARE TRANSMITTED TO AND FROM THE CARS OVER A SQUARE-WAVE TRACKWIRE SYSTEM. CAR- CARRIED AND TRACKSIDE EQUIPMENT AND HARDWARE WAS HELD TO A MINIMUM AND WAS CONCENTRATED AT THE WAYSIDE CONTROLLER LOCATION WHERE ACCESSIBILITY AND MAINTAINABILITY WAS MAXIMIZED. THE SIGNAL COMMUNICATION SYSTEM PROVED TO BE ONLY MARGINALLY ADEQUATE IN THE ELECTRICAL NOISE ENVIRONMENT ENCOUNTERED IN THE ELECTRICAL INTERFERENCE FROM THE PROPULSION CURRENTS WHICH PRODUCED NOISE IMPULSES IN BOTH THE CAR-TO-WAYSIDE CHANNELS AND THE COMMAND TONE CHANNELS. THE NOISE INTERFERENCE, WHICH COULD RESULT IN STOPPING TRAINS WHEN THE WAYSIDE CONTROLLER DETECTED UNREASONABLE SIGNALS OR COULD CAUSE INACCURATE STATION STOPS DUE TO SMALL INFORMATION TRANSMISSION ERRORS, WAS AVOIDED, TO A GREAT EXTENT, BY CAREFUL ADJUSTMENT OF RECEIVER SENSITIVITIES. THE DEVELOPMENT AND TESTING OF NEW CAR-TO-WAYSIDE AND WAYSIDE- TO-CAR COMMUNICATION SYSTEMS UTILIZING ADVANCED STATE-OF-ART TECHNIQUES AND HARDWARE IS RECOMMENDED. SIMPLE PANEL CONTROLS WERE, IN MOST CASES, SUFFICIENT TO MAKE CHANGES EASILY IN THE: (1) AVERAGE BRAKING EFFORT REQUIRED FOR STOPPING; (2) MAXIMUM SPEED LIMITS FOR A GIVEN CAR OVER THE WHOLE TRACK OR FOR ALL CARS OVER ANY DESIRED TRACK SECTION; ROUTING PATTERNS AT INTERLOCKINGS; STATION STOPPING POSITIONS; AND (3) REVERSE, SHUTTLE-TYPE OPERATIONS BETWEEN TWO STATIONS. SMOOTHNESS AND ACCURACY OF CONTROL OF THE SYSTEM, WITH MAXIMUM ALLOWABLE SPEED PROFILES BEING FILLED AND CONSISTENT, WAS INDICATED BY INSTALLATION AND TEST RESULTS. ALL PROGRAMMED STOPS WERE WELL CONTROLLED AND SMOOTHLY TAPERED AT THE FINAL STOP, WITH APPROXIMATELY 85% OF THE STATION PLATFORM STOPS BEING WITHIN THE PLUS OR MINUS 1 FOOT SPECIFICATION. PROGRAMMING TECHNIQUES REQUIRE FURTHER REFINEMENT TO REDUCE PROGRAMMING AND DEBUGGING EFFORTS. ALSO, ADDITIONAL DEVELOPMENT OF METHODS FOR INSURING AND VERIFYING FAIL-SAFE SOFTWARE TECHNIQUES IS IN ORDER. IT IS FURTHER RECOMMENDED THAT A MINATURIZATION OF THE TRACKWIRE SYSTEM INVOLVED BE DEVELOPED TO BE MORE RUGGED, EASIER TO INSTALL, AND LESS EXPENSIVE. /UMTA/

  • Supplemental Notes:
    • PROJ NO CAL-MTD-2
  • Corporate Authors:

    Westinghouse Electric Corporation

    Westinghouse Building
    Pittsburgh, PA  United States  15222
  • Publication Date: 1966-6

Subject/Index Terms

Filing Info

  • Accession Number: 00242152
  • Record Type: Publication
  • Source Agency: Urban Mass Transportation Administration
  • Files: TRIS, USDOT
  • Created Date: Jan 17 1981 12:00AM