Three areas of research at the Japanese mechanical engineering laboratory in automatic vehicle control are described. The first is a radio-frequency induction system of road-to-car and car-to-road communication. Leader cables on either side of the road, in antiphase, can find, transmit to, or receive from a car fitted with a coil antenna. If the cable is fed alternating current, the cars lateral position can be determined. Track tests showed high signal-to-noise ratio and stability. Ten kilometers of test cable were laid on an expressway outside Tokyo in 1970, where weather and the effects of other cars could be tested. a similar test with 20 kilometers of expressway was installed in 1972. Secondly, a blind-driving control system is being developed, using both the inductive cable, for lateral position, and 'parametron' logic elements for block control. A differential as well as a proportional lateral signal was needed to guide a driver safety at 60 kph. His distance from a leading car is determined by the parametrons, and sub-surface loops, which keep him at least five blocks behind, either by warning lights or by automatic braking. Lastly, an optical pattern-recognition device has been developed which can distinguish a solid obstacle from road markings. The images from two barrier- mounted vidicons are digitized and mixed; their delay times describe the distance to the signal sources. Diagrams are given of all systems, and some sample position error signals.

  • Corporate Authors:

    Toyota Motor Sales Company, Limited

    3-18, 2-chome, Kudan-Minami, Chiyoda-ku
    Tokyo 102,   Japan 
  • Authors:
  • Publication Date: 1972


  • English

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: p. 10-19
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00261571
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Nov 12 1974 12:00AM