Emergency engine shutoff apparatus and accident determining apparatus for ship

Abstract

An emergency engine shutoff apparatus for shutting off an engine in an accident of a ship having a hull and an outboard engine system is provided which includes: an acceleration detector for detecting an acceleration applied in a longitudinal direction of the hull and an acceleration applied in a vertical direction of the hull; an accident determining apparatus for determining that a collision accident occurred when the acceleration applied in a longitudinal direction of the hull exceeds a threshold, and for determining that a capsize accident occurred when a roll angle of the ship exceeds a threshold, the roll angle being arithmetically operated by using the acceleration in the vertical direction; and an engine shutoff apparatus for shutting off the engine by stopping fuel supply to the engine when it is determined that a collision accident or a capsize accident occurred.

1 . An emergency engine shutoff apparatus for ship which shuts off an engine in an accident of a ship having a hull and a propulsion apparatus having the engine as a driving source, comprising:
 an acceleration detector for detecting an acceleration applied onto the hull;   an accident determining apparatus which includes accident determining means for determining a presence/absence of an accident based on an output of the acceleration detector, on the premise that a collision with something and/or a capsize of the hull is an accident to be determined; and   engine shutting off means in accident for shutting off the engine when the accident determining apparatus determines that an accident occurred.   
   
   
       2 . The emergency engine shutoff apparatus for ship according to  claim 1 , wherein
 the acceleration detector is provided so as to detect at least an acceleration Gx applied in a longitudinal direction of the ship, and   the accident determining apparatus includes accident determining means for determining that the hull collided with something when an acceleration Gx applied in the longitudinal direction of the ship exceeds a threshold in an acceleration or deceleration of the ship.   
   
   
       3 . The emergency engine shutoff apparatus for ship according to  claim 1 , wherein
 the acceleration detector is provided so as to detect at least an acceleration Gy applied in a vertical direction of the ship, and   the accident determining apparatus includes accident determining means for determining that the ship capsized when a roll angle θr of the ship exceeds a preset threshold, the roll angle θr being obtained based on an arccosine value: cos −1  Gy of the acceleration Gy applied in a vertical direction of the ship.   
   
   
       4 . The emergency engine shutoff apparatus for ship according to  claim 1 , wherein
 the acceleration detector is provided so as to detect at least an acceleration Gz applied in a lateral direction of the ship, and   the accident determining apparatus includes accident determining means for determining that the ship capsized when a roll angle θr of the ship exceeds a preset threshold, the roll angle θr being obtained based on an arcsine value: sin −1  Gz of the acceleration Gz applied in a lateral direction of the ship.   
   
   
       5 . The emergency engine shutoff apparatus for ship according to  claim 1 , wherein
 the acceleration detector is provided so as to detect an acceleration Gx applied in a longitudinal direction and an acceleration Gy applied in a vertical direction of the ship, and   the accident determining apparatus includes accident determining means for determining that the hull collided with something when the acceleration Gx applied in the longitudinal direction of the ship exceeds a threshold in an acceleration or deceleration of the ship, and for determining that the ship capsized when a roll angle θr of the ship exceeds a preset threshold, the roll angle θr being obtained based on an arccosine value: cos −1  Gy of the acceleration Gy applied in a vertical direction of the ship.   
   
   
       6 . The emergency engine shutoff apparatus for ship according to  claim 1 , wherein
 the acceleration detector is provided so as to detect an acceleration Gx applied in a longitudinal direction and an acceleration Gz applied in a lateral direction of the ship, and   the accident determining apparatus includes accident determining means for determining that the hull collided with something when the acceleration Gx applied in the longitudinal direction of the ship exceeds a threshold in an acceleration or deceleration of the ship, and for determining that the ship capsized when a roll angle θr of the ship exceeds a preset threshold, the roll angle θr being obtained based on an arcsine value: sin −1  Gz of the acceleration Gz applied in a lateral direction of the ship.   
   
   
       7 . The emergency engine shutoff apparatus for ship according to  claim 1 , wherein
 the acceleration detector is provided so as to detect an acceleration Gz applied in a lateral direction and an acceleration Gy applied in a vertical direction of the ship, and   the accident determining apparatus includes accident determining means for determining that the ship capsized when a roll angle of the ship exceeds a preset threshold, the roll angle being obtained based on an arctangent value tan −1 (Gz/Gy) of a ratio (Gz/Gy) between the acceleration Gz applied in the lateral direction and the acceleration Gy applied in the vertical direction of the ship.   
   
   
       8 . The emergency engine shutoff apparatus for ship according to  claim 1 , wherein
 the acceleration detector is provided so as to detect an acceleration Gx applied in a longitudinal direction, an acceleration Gy applied in a vertical direction, and an acceleration Gz applied in a lateral direction of the ship, and   the accident determining apparatus includes accident determining means for determining that the hull collided with something when the acceleration Gx applied in the longitudinal direction of the ship exceeds a threshold in an acceleration or deceleration of the ship, and for determining that the ship capsized when a roll angle θr of the ship exceeds a preset threshold, the roll angle being obtained based on an arctangent value tan −1 (Gz/Gy) of a ratio (Gz/Gy) between the acceleration Gz applied in the lateral direction and the acceleration Gy applied in the vertical direction of the ship.   
   
   
       9 . The emergency engine shutoff apparatus for ship according to  claim 1 , wherein
 the propulsion apparatus is an outboard engine system, and the outboard engine system is provided with a controller therein for controlling a trim angle of the outboard engine system, controlling the engine, and performing a process to construct the accident determining apparatus, and   the acceleration detector is provided in the controller.   
   
   
       10 . The emergency engine shutoff apparatus for ship according to  claim 1 , wherein
 the engine is comprised so that fuel is supplied thereto by an fuel injection apparatus which has an injector and a fuel pump for supplying fuel to the injector, and   the engine shutting off means in accident is comprised so as to shut off the engine by stopping driving at least one of the fuel pump and the injector to stop fuel supply to the engine when the accident determining apparatus determines that an accident occurred.   
   
   
       11 . The emergency engine shutoff apparatus for ship according to  claim 1 , wherein
 the engine is comprised so that fuel is supplied thereto by an fuel injection apparatus which has an injector and a fuel pump for supplying fuel to the injector, and   the engine shutting off means in accident is comprised of fuel supply stopping means for stopping fuel supply to the engine by stopping driving at least one of the fuel pump and the injector when the accident determining apparatus determines that an accident occurred, and ignition operation stopping means for stopping any ignition operation of the engine when the accident determining apparatus determines that an accident occurred.   
   
   
       12 . The emergency engine shutoff apparatus for ship according to  claim 1 , wherein
 the engine shutting off means in accident is comprised of ignition operation stopping means for stopping an ignition operation of the engine when the accident determining apparatus determines that an accident occurred.