A NEW VEHICLE GUIDANCE AND SPEED CONTROL SYSTEM
A NEW VEHICLE GUIDANCE AND SPEED CONTROL SYSTEM, USING ONLY PASSIVE ROADBED EQUIPMENT, IS PRESENTED. THE OPERATION OF THE SYSTEM IS BASED ON THE DETECTION OF POSITION AND SPEED INFORMATION BY MEANS OF RADIO-FREQUENCY MAGNETIC FIELDS INDUCED IN ROADBED LOOPS BY A VEHICLE-BORNE GENERATOR. BY SUITABLE COUPLING OF THE GUIDANCE DETECTOR TO THE VEHICLE STEERING MECHANISM, THE GUIDANCE SYSTEM IS MADE NULL-SEEKING, THUS ELIMINATING ANY DEPENDENCE ON THE ABSOLUTE MAGNITUDE OF THE SIGNAL SEEN BY THE DETECTOR. THE OPERATION OF THE SPEED CONTROL SYSTEM DEPENDS ON A PULSE FREQUENCY DERIVED FROM THE SPACING OF THE ROADBED LOOPS. THE SYSTEM IS SHOWN TO POSSESS A NUMBER OF ADVANTAGES, INCLUDING (1) PASSIVE, DURABLE, AND INEXPENSIVE ROAD EQUIPMENT, (2) INDIVIDUAL VEHICULAR-BORNE ACTIVE EQUIPMENT, PRESENTING NO STANDING WAVE PROBLEM AND INVOLVING LOW POWER LEVELS, (3) DETECTION EQUIPMENT ENTIRELY PHASE DEPENDENT, RATHER THAN AMPLITUDE DEPENDENT, (4) INHERENT DAMPING OF LATERAL ACCELERATION, (5) SPEED CONTROL EASILY SUBJECT TO EXTERNAL MODERATION, AND (6) THE SYSTEM LENDING ITSELF TO ADEQUATE SAFETY FEATURES AND TO ADAPTIONS AND ADDITIONS NECESSARY FOR FUTURE EXTENDED CONTROL FUNCTIONS, INCLUDING COMPLETELY PROGRAMMED TRAVEL. /AUTHOR/
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Supplemental Notes:
- Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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Authors:
- Spangler, Robert A
- Snell, Fred M
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Conference:
- 41st Annual Meeting of the Highway Research Board
- Location: Washington DC, United States
- Date: 1962-1-8 to 1962-1-12
- Publication Date: 1962
Media Info
- Media Type: Print
- Features: Figures; References;
- Pagination: pp 20-27
- Monograph Title: Electronics in traffic operations
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Serial:
- Highway Research Board Bulletin
- Issue Number: 338
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Advanced vehicle control systems; Advanced vehicle control systems; Detectors; Electromagnetic fields; Generators; Radio equipment; Speed control
- Subject Areas: Highways; Operations and Traffic Management;
Filing Info
- Accession Number: 00225240
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Aug 5 1994 12:00AM