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1. (WO2012090375) SHIP STEERING GEAR AND SHIP STEERING METHOD

Pub. No.:    WO/2012/090375    International Application No.:    PCT/JP2011/006404
Publication Date: Fri Jul 06 01:59:59 CEST 2012 International Filing Date: Fri Nov 18 00:59:59 CET 2011
IPC: B63H 25/30
F15B 11/02
Applicants: KAWASAKI JUKOGYO KABUSHIKI KAISHA
川崎重工業株式会社
FUJISAWA, Masahiro
藤澤 雅浩
MATSUOKA, Yoshihiko
松岡 嘉彦
SHIMOMAI, Takashi
下舞 高志
NAKAMURA, Hikaru
中村 光
YAMAGUCHI, Kaori
山口 香織
Inventors: FUJISAWA, Masahiro
藤澤 雅浩
MATSUOKA, Yoshihiko
松岡 嘉彦
SHIMOMAI, Takashi
下舞 高志
NAKAMURA, Hikaru
中村 光
YAMAGUCHI, Kaori
山口 香織
Title: SHIP STEERING GEAR AND SHIP STEERING METHOD
Abstract:
To reduce the amount of energy consumed by an electric motor and to suppress deterioration of a working fluid due to increased temperature while a steering unit is not being operated. When the rudder angle deviation between a rudder angle command and an actual rudder angle is zero (or equal to or less than a first rudder angle deviation) in a situation in which a steering unit (46) is not being operated, a control unit (35) stops the supply of hydraulic fluid to a rudder drive unit (21) from a hydraulic pump (32). When the duration time T during which the supply of hydraulic fluid has been stopped is equal to or less than a set duration time TS, the electric motor (33) operating the hydraulic pump (32) is rotated at a lower first rotational speed. When the duration time T exceeds the set duration time TS, the electric motor (33) is rotated at a very low second rotational speed below the first rotational speed, or is stopped.