CONFERENCE ON CONTROL ASPECTS OF NEW FORMS OF GUIDED LAND TRANSPORT HELD AT THE INSTITUTION OF ELECTRICAL ENGINEERS, LONDON, 28-30TH AUGUST, 1974. AUTOMATICALLY CONTROLLED ROAD VEHICLES

This report describes the dual mode concept of vehicle automation being considered at TRRL. Details are given of (1) the lateral control of the guidance system which is provided by a cable buried below the road surface and energised with an audio frequency of 5 KHZ at 150 M.A. Two ferrite-cored pick-up coils are mounted on either side of the front of the vehicle to sense the horizontal component of the electromagnetic held about the cable. The original TRRL guided vehicle, a citroen ds19, used a hydraulic jack in the steering linkage to provide the steering force. This technique was complex and expensive. Recent advances in dc motor design have now made dc motor drives both feasible and economically attractive. The switching amplifier designed for TRRL is described; (2) the longitudinal control systems which are based on a closed loop control of vehicle speed. Speed commands in voltage form in the range 0 - 10 volts are supplied to the control system, the amplitude of the voltage command being proportional to the required vehicle speed. The speed command signal, fed to the speed control loop, is generated by (1) a cruise control selector, (2) a road to vehicle speed command link, and (3) an automatic headway control system. During normal experimental running only one of these three sources is switched on at any time. For the covering abstract of the conference see IRRD abstract No. 400100. /TRRL/

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  • Corporate Authors:

    Institution of Electrical Engineers

    Savoy Place
    London WC2R 0BL, NY  England  10016-5997
  • Authors:
    • Dobson, J S
    • PENOYRE, S
    • Stoneman, B G
  • Publication Date: 1974

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Filing Info

  • Accession Number: 00125050
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Conf Publ 117 Conf Paper
  • Files: ITRD, TRIS
  • Created Date: Dec 3 1981 12:00AM