(19)
(11) EP 1 923 307 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.05.2011 Bulletin 2011/21

(43) Date of publication A2:
21.05.2008 Bulletin 2008/21

(21) Application number: 07022320.1

(22) Date of filing: 16.11.2007
(51) International Patent Classification (IPC): 
B63H 25/02(2006.01)
B63H 20/12(2006.01)
B63H 25/24(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 17.11.2006 JP 2006312184
17.11.2006 JP 2006312161
17.11.2006 JP 2006312172
17.11.2006 JP 2006312228

(71) Applicant: Yamaha Hatsudoki Kabushiki Kaisha
Shizuoka-ken Shizuoka 438-8501 (JP)

(72) Inventor:
  • Mizutani, Makoto c/o Yamaha Marine Kabushiki Kaisha
    Hamamatsu-shi, Shizuoka-ken (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Leopoldstrasse 4
80802 München
80802 München (DE)

   


(54) Steering system for a watercraft


(57) The present invention relates to a steering system for a watercraft, comprising: a watercraft propulsion unit (12), a steering device (16) actuated by an actuator (20) for changing a direction in which the watercraft travels, and a steering amount input means such as a steering wheel (17), operable by an operator, and electrically connected to the actuator (20) to provide an actuation signal corresponding to an operation amount of the actuator (20), and a control unit (33) comprising at least one of steerage status detection means (38) for detecting a steerage status following an operation of the steering amount input means (17), running status detection means (39) for detecting a running status of the watercraft, watercraft propulsion unit status recognition means (40) for recognizing a status of the watercraft propulsion unit such as an installation number thereof, and actuator status detection means (41) for detecting a status of the actuator (20); and comprising rudder turning force characteristic computation means (37) for computing a rudder turning force characteristic based on a detection value from at least one of the detection and recognition means; and control means (42,43,44,56) for controlling at least one of a reaction force to the steering amount input means (17), a limit rudder turning angle, and a propulsive force based on a computed rudder turning force characteristic and/or selecting the actuator to operate.







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