(19)
(11) EP 0 147 539 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.09.1985 Bulletin 1985/37

(43) Date of publication A2:
10.07.1985 Bulletin 1985/28

(21) Application number: 84111577

(22) Date of filing: 27.09.1984
(84) Designated Contracting States:
DE FR GB

(30) Priority: 30.09.1983 JP 18066883

(71) Applicant: NISSAN MOTOR CO., LTD.
 ()

(72) Inventors:
  • Obara, Hideo
     ()
  • Yanagishima, Takayuki
     ()
  • Seko, Yasutoshi
     ()

   


(54) System and method for detecting and warning of drowsy driving of a vehicle


(57) In a drowsy driving detection system, drowsiness is recognized when an extended period without any steering adjustments is followed by abrupt steering corrections, of at least minimal speed and extent, in both directions. The minimal speed values are selected in accordance with the detected angular extent of each steering correction. The extent of each steering correction may be subdivided into a number of ranges, each associated with a predetermined reference minimal steering speed value. The reference speed value selection process may be applied to the steering corrections in either or both directions.






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