(19)
(11) EP 0 199 329 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.04.1989 Bulletin 1989/14

(43) Date of publication A2:
29.10.1986 Bulletin 1986/44

(21) Application number: 86105498.9

(22) Date of filing: 21.04.1986
(51) International Patent Classification (IPC)4: G08G 1/01
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 19.04.1985 JP 84855/85

(71) Applicant: OMRON TATEISI ELECTRONICS CO.
Kyoto 616 (JP)

(72) Inventors:
  • Mizuno, Masao Omron Tateisi Electronics Co.
    Nagaokakyo-shi Kyoto 617 (JP)
  • Maruo, Tosihiko Omron Tateisi Electronics Co.
    Nagaokakyo-shi Kyoto 617 (JP)
  • Fujimoto, Takuya Omron Tateisi Electronics Co.
    Nagaokakyo-shi Kyoto 617 (JP)
  • Sawada, Seiichi Omron Tateisi Electronics Co.
    Nagaokakyo-shi Kyoto 617 (JP)
  • Kanayama, Kenji Omron Tateisi Electronics Co.
    Nagaokakyo-shi Kyoto 617 (JP)

(74) Representative: WILHELMS, KILIAN & PARTNER Patentanwälte 
Eduard-Schmid-Strasse 2
81541 München
81541 München (DE)


(56) References cited: : 
   
       


    (54) Vehicle detecting system


    (57) There is a vehicle detecting system for detecting the number of vehicles which pass the roadway, thereby realizing the smooth flow of vehicles. This system comprises: a transmitting coil (2) and a receiving coil (4) which are arranged on both sides of the vehicle detection area set over the roadway; a driving circuit (3) to supply a high frequency exciting current to the transmitting coil; and vehicle detecting circuit (5) to output a vehicle detection signal in response to a change in level or phase of the electrical signal which is induced in the receiving coil. The detection signal is outputted when the signal level exceeds a predetermined value or when the signal phase exceeds a predetermined angle. One or a plurality of pairs of transmitting and receiving coils may be buried under the roadway surface or on or above the roadway at regular intervals. With this system, the installing construction of the coils is simplified and the possibility of the occurrence of the accident such as disconnection of the coil is reduced. The vehicle on the roadway can be certainly detected.






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