Patent Publication Number: US-2023150611-A1

Title: Small planing watercraft and processing method for small planing watercraft

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present disclosure relates to small planing watercrafts and processing methods for small planing watercrafts. 
     Description of the Background Art 
     US 6244916 B1 discloses a small planing watercraft including a storage box and a hatch cover covering an opening of the storage box. 
     SUMMARY 
     A small planing watercraft according to one aspect is a small planing watercraft including: a body including a storage box and a lid, the storage box including an opening, the lid releasably closing the opening; an opening and closing sensor detecting opening and closing of the lid; and processing circuitry determining whether the lid is open based on a result of detection of the opening and closing sensor, and, when determining that the lid is open, outputting a signal indicating that the lid is open. 
     According to the small planing watercraft, notification to an operator, control of travel, or the like can be provided based on the signal indicating that the lid is open. 
     A small planing watercraft according to another aspect is a processing method for a small planing watercraft including a storage box and a lid, the storage box including an opening, the lid releasably closing the opening, the processing method including: detecting opening and closing of the lid; determining whether the lid is open based on a result of detection; and, when determining that the lid is open, setting a travel mode to a second travel mode in which output is suppressed relative to a first travel mode. 
     Ingress of water into the storage box and a fall of an object out of the storage box are thus suppressed. 
     A small planing watercraft according to yet another aspect is a processing method for a small planing watercraft including a storage box and a lid, the storage box including an opening, the lid releasably closing the opening, the processing method including: detecting opening and closing of the lid; determining whether the lid is open based on a result of detection; and, when determining that the lid is open, providing notification that the lid is open. 
     The operator can thus be notified that the lid is open. 
     These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a side view illustrating a small planing watercraft in a first embodiment; 
         FIG.  2    is a plan view illustrating the small planing watercraft; 
         FIG.  3    is a partial cross-sectional view taken along the line III-III of  FIG.  1   ; 
         FIG.  4    is a block diagram showing an electrical configuration of the small planing watercraft; 
         FIG.  5    illustrates an example of display of a display device; 
         FIG.  6    is a flowchart showing an example of processing of a control device; and 
         FIG.  7    is a flowchart showing an example of processing of a control device in a second embodiment. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     First Embodiment 
     A small planing watercraft and a processing method for the small planing watercraft in a first embodiment will be described below. 
     Overall Configuration 
     An overall configuration of a small planing watercraft  10  will be described.  FIG.  1    is a side view illustrating the small planing watercraft  10 .  FIG.  2    is a plan view illustrating the small planing watercraft  10 . An operator P on board the small planing watercraft  10  is illustrated in  FIG.  2   . The small planing watercraft  10  is a boat raised by lift when moving forward, and planing to slide across a water surface. The small planing watercraft  10  may have a size for a single person, two to four people, or five or more people, for example. One example of the small planing watercraft  10  is a personal watercraft (PWC). The small planing watercraft  10  may be a motorboat. An example in which the small planing watercraft  10  is the PWC will be described in the present embodiment. 
     The small planing watercraft  10  includes a body  12 , a seat  18 , and a handle device  20 . The body  12  is a structure of the small planing watercraft  10  having a space to generate buoyancy in water. For example, the body  12  includes a hull  13  and a deck  14 . The hull  13  is a container-like structure closing on a lower side and opening on an upper side. The deck  14  covers an opening on the upper side of the hull  13 . The seat  18  is disposed on the deck  14 . The operator P is seated on the seat  18 . The handle device  20  is disposed above the body  12  and forward of the seat  18 . The operator P operates the handle device  20  in a state of being seated on the seat  18 . With reference to a posture of the operator operating the small planing watercraft  10  in a planing state, a side forward of the operator is a front side, and a side rearward of the operator is a rear side. A left side and a right side are determined with reference to a state of the operator facing forward. A side of the hull  13  is a lower side, and a side of the deck  14  is an upper side. 
     The deck  14  includes a front  14   a , a central protrusion  14   b , side floors  14   c , and a rear floor  14   d . The front  14   a  covers a front portion of the opening on the upper side of the hull  13 . The front  14   a  is curved to be convex. When viewed from one side along the width, the front  14   a  gradually slopes upward from a front end portion of the hull  13 , reaches the top near the handle device  20 , gradually slopes downward from the top, and is connected to the seat  18 . When viewed from the front, the front  14   a  gradually slopes upward from a right or left portion toward a central portion along the width of the hull  13 . The central protrusion  14   b  extends rearward from a central portion along the width of a rear end of the front  14   a . The central protrusion  14   b  has a smaller width than the deck  14 . The side floors  14   c  extend outward along the width of the central protrusion  14   b . A rear end of the central protrusion  14   b  is located forward of a rear end of the deck  14 . The rear floor  14   d  extends behind the central protrusion  14   b  of the deck  14 . The central protrusion  14   b  protrudes above the side floors  14   c  and the rear floor  14   d . 
     The body  12  is a body turnable while rolling. That is to say, the opening on the upper side of the hull  13  is covered with the deck  14 . Ingress of water into the hull  13  is thus less likely to occur when the hull  13  rolls compared with a case where the deck  14  is not provided. The body  12  is thus turnable while rolling with ingress of water being prevented. Turning while rolling is, for example, turning to the right or left while inclining at an angle of more than 30° about a roll axis. Turning while inclining at an angle of 30° may or may not be considered as turning while rolling. 
     The seat  18  is supported by an upper portion of the central protrusion  14   b . The operator P is seated on the seat  18  to straddle the seat  18 . The seat  18  is longer in a fore-aft direction, for example. The seat  18  includes a seat front portion  18   a  and a seat rear portion  18   b  located rearward of the seat front portion  18   a , for example. The seat front portion  18   a  is lower than the seat rear portion  18   b . From among users, the operator P is seated on the seat front portion  18   a , and a passenger is seated on the seat rear portion  18   b . 
     The small planing watercraft  10  includes a propulsion device  30 . The propulsion device  30  is a device to propel the small planing watercraft  10 . The propulsion device  30  includes a travel drive source  31 , an impeller  32 , a stator vane  33 , and a nozzle  34 , for example. 
     The travel drive source  31  is a drive source generating propulsion power. In the present embodiment, the travel drive source  31  rotationally drives the impeller  32 . The travel drive source  31  is only required to generate propulsion for the small planing watercraft  10 . For example, the travel drive source  31  may be an internal combustion engine generating rotary drive force through fuel combustion or an electrical motor generating the rotary drive force using electrical energy. Assume that the travel drive source  31  is the internal combustion engine in the present embodiment. The travel drive source  31  is disposed within the body  12 , for example. The body  12  has a water flow path  12 P to take in water outside the body  12  and jet water rearward. The impeller  32  is disposed within the flow path  12 P. The travel drive source  31  rotationally drives the impeller  32  to allow water within the flow path  12 P to flow rearward of the impeller  32 . The stator vane  33  is disposed rearward of the impeller  32  within the flow path  12 P. A swirling flow behind the impeller  32  is rectified by the stator vane  33 , and is allowed to flow further rearward. The nozzle  34  is disposed at a rear end portion of the flow path  12 P. Water flowing from the impeller  32  through the stator vane  33  is compressed by the nozzle  34 , and jetted rearward of the body  12 . Forward propulsion for the small planing watercraft  10  can thus be obtained. 
     The propulsion device of the small planing watercraft  10  is not limited to that in the above-mentioned example. For example, the small planing watercraft  10  may be propelled by rotating a screw outside the body  12 . 
     The handle device  20  includes a columnar part  21  extending upward from the deck  14  and a handle  22 . The handle  22  includes left and right handle grips  22   a  extending both to the left and to the right from an upper end portion of the columnar part  21 . A central portion along the width of the handle  22  is supported by the upper end portion of the columnar part  21 , so that the handle  22  is supported at a position above the body  12 . The operator P can operate the small planing watercraft  10  while grasping the left and right handle grips  22   a  in a state of being seated on the seat front portion  18   a . 
     The small planing watercraft  10  includes left and right auxiliary mirrors  16 . The left and right auxiliary mirrors  16  are disposed forward of the seat  18 . For example, the left and right auxiliary mirrors  16  protrude outward along the width from the front  14   a  at a position forward of the left and right handle grips  22   a . The operator P seated on the seat  18  can see a rearward range reflected in reflecting surfaces of the auxiliary mirrors  16  by viewing the reflecting surfaces while facing forward. One or both of the auxiliary mirrors  16  may be omitted. 
     The small planing watercraft  10  includes a display device  48 . The display device  48  is disposed forward of the seat  18 . The display device  48  is located to be recognizable by the operator seated on the seat front portion  18   a  while grasping the pair of handle grips  22   a , for example. For example, the display device  48  is attached to the front  14   a  to be located forward of the handle device  20  and at the center along the width of the deck  14 . The display device  48  may be attached to the handle device  20 . The display device  48  may be omitted. Examples of the display device  48  include a liquid crystal display and an organic electro-luminescence (EL) display. The display device  48   displays visual information for people on board including the operator. The operator can acquire the visual information displayed by the display device  48  by viewing the display device  48  while operating the small planing watercraft  10 . 
     Storage Box and Lid 
       FIG.  3    is a partial cross-sectional view taken along the line III-III of  FIG.  1   . As illustrated in  FIGS.  1  to  3   , the body  12  includes a storage box  50  and a lid  56 . The storage box  50  has an opening  50   h , and can store an object  8 . The lid  56  releasably closes the above-mentioned opening  50   h . In the present embodiment, the body  12  includes storage boxes  50  and lids  56 . More specifically, the body  12  includes left and right storage boxes  50  and left and right lids  56 . 
     In the present embodiment, the two storage boxes  50  are disposed in opposite side portions of the front  14   a . That is to say, the side portions of the front  14   a  have openings  14   ah . The openings  14   ah  are located in intermediate portions in the fore-aft direction of the front  14   a  to be closer to the top and to the center along the width of the body  12 , for example. In the present embodiment, portions of the front  14   a  supporting the auxiliary mirrors  16  have the openings  14   ah . The openings  14   ah  are longer in the fore-aft direction, for example. 
     Each of the storage boxes  50  includes a bottom  51  and a side wall  52 . The bottom  51  is a plate-like portion spanning a region of each of the openings  14   ah  when viewed from above. The side wall  52  protrudes upward from the periphery of the bottom  51  to form a storage space S above the bottom  51 . A portion of the side wall  52  located to be closer to the center along the width of the body  12  protrudes more than a portion of the side wall  52  located outward along the width of the body  12 . Portions of the side wall  52  located on opposite sides in the fore-aft direction of the body  12  each gradually increasingly protrude with decreasing distance from the center along the width of the body  12 . The opening  50   h  having the shape and the size corresponding to those of the above-mentioned opening  14   ah  is formed on a side of the side wall  52  opposite the bottom  51 . 
     The storage box  50  is attached to the body  12  with the bottom  51  being disposed within the front  14   a  in a horizontal posture and with the opening  50   h  matching the opening  14   ah . The storage box  50  is attached by a screwing, welding, or fitting structure, for example. The storage space S surrounded by the bottom  51  and the side wall  52  is thus formed inside the opening  14   ah  of the front  14   a . 
     The opening  50   h  of the storage box  50  is located forward of the handle  22  when the storage box  50  is attached to the deck  14 . The operator P seated on the seat  18  can thus easily access the interior of the storage box  50  by reaching forward of the handle  22 . The operator P seated on the seat  18  can also easily observe a state of the opening  50   h  of the storage box  50  by looking forward of the handle  22 . 
     A portion of the front  14   a  where the storage box  50  is provided gradually slopes upward toward the center along the width of the body  12 . The openings  14   ah  and  50   h  thus open orthogonally to an up-down direction. In the present embodiment, the opening  50   h  opens to one side from the center along the width of the body  12 . It can be said that the opening  50   h  opens when viewed from outside along the width of the body  12 . 
     When the opening  50   h  opens orthogonally to the up-down direction, it is easy to observe the interior of the storage box  50  and to take an object in and out of the storage box  50 . On the other hand, when the opening  50   h  remains open, ingress of water into the storage box  50  is likely to occur. Furthermore, the object  8  inside the storage box  50  is likely to fall out. In particular, when the opening  50   h  opens outward along the width of the body  12 , ingress of water into the storage box  50  is likely to occur due to waves made outside the small planing watercraft  10  during planing of the small planing watercraft  10 . 
     The lid  56  is shaped to be able to close the opening  50   h . That is to say, an outer peripheral edge of the lid  56  is shaped along an edge of the opening  50   h . An outer surface of the lid  56  spans a region where the opening  50   h  is closed. An outer surface  56   f  of the lid  56  serves as a portion of an outer surface of the body  12  when the lid  56  is closed. For example, the outer surface  56   f  is contiguous with an outer surface of the front  14   a  around the opening  14   ah  with or without a step therebetween. The outer surface of the lid  56  thus serves as a portion of the outer surface of the front  14   a  to prevent ingress of water into the body  12 . The outer surface  56   f  may be curved to be convex to match the outer surface of the front  14   a  around the opening  14   ah . The lid  56  is connected to an edge of the opening  14   ah  by a hinge  58 . For example, a front end portion of the lid  56  is connected to a front end portion of the edge of the opening  14   ah  by the hinge  58 . The hinge  58  may include an opening and closing shaft along the up-down direction. In this case, the lid  56  can swing around an axis along the up-down direction of the hinge  58 . The lid  56  extends rearward from the hinge  58  to close the opening  50   h . The lid  56  extends outward along the width of the body  12  or obliquely rearward from the hinge  58  to open the opening  50   h . 
     The opening of the storage box  50  may be the opening  14   ah  of the front  14   a . The storage box  50  and the front  14   a  may integrally be molded using the same material. 
     The small planing watercraft  10  includes an opening and closing sensor  59  detecting opening and closing of the lid  56 . The opening and closing sensor  59  may be a contact sensor detecting contact between the lid  56  and the opening  50   h , for example. That is to say, the outer peripheral edge of the lid  56  is in contact with the edge of the opening  50   h  when the lid  56  closes the opening  50   h . The opening and closing sensor  59   may be a contact sensor including an operational part  59   a , and, upon pressing of the operational part  59   a , a point of contact may be switched from an open state to a closed state or vice versa, for example. The opening and closing sensor  59  is assembled to the opening  50   h  with the above-mentioned operational part  59   a  protruding from the edge of the opening  50   h . The operational part  59   a  protrudes from the opening  50   h  due to an elastic force of a spring and the like when the lid  56  is open. The operational part  59   a  is pressed by the outer peripheral edge of the lid  56  when the lid  56  is closed to be in contact with the opening  50   h . The operational part  59   a  returns to the protruding state by the elastic force of the spring and the like when the lid  56  is opened. The point of contact in the opening and closing sensor  59  is switched between the open state and the closed state depending on whether the operational part  59   a  is in the protruding state or a retracted state. A detection signal is output from the opening and closing sensor  59  in response to the open or closed state. The contact sensor may be a sensor referred to as a push switch or a microswitch. 
     Block Diagram 
       FIG.  4    is a block diagram showing an electrical configuration of the small planing watercraft  10 . The small planing watercraft  10  includes a control device  60 . The control device  60  is a microcomputer including a processor  62 , a storage device  64 , and the like. The control device  60  is one example of processing circuitry. The processor  62  is an electrical circuit including an arithmetic circuit, and is a central processing unit (CPU), for example. The processor  62  may include one or more processor cores. Processing of the control device  60  may be achieved by one or more processors  62  of the control device  60 , or may be achieved by cooperative processing of control devices. The storage device  64  is nonvolatile memory, such as flash memory. A software program  64   a  is stored in the storage device  64 . The processor  62  performs arithmetic operation according to procedures described in the program  64   a  to perform control described below. 
     The control device  60  is connected to various sensors and a drive control component of an operation receiving unit  24 , the opening and closing sensor  59 , the display device  48 , and the travel drive source  31 . 
     The operation receiving unit  24  receives input operation relating to operation from the operator, and provides a signal in response to the received input operation to the control device  60 . The operation receiving unit  24  includes a starter switch to start the travel drive source  31  as the internal combustion engine, for example. 
     The opening and closing sensor  59  detects the open or closed state of the lid  56 , and provides the detection signal to the control device  60 . 
     The display device  48  performs display according to display control performed by the control device  60 . 
     The travel drive source  31  includes a rotation sensor  31   a  and a throttle valve  31   b , for example. The rotation sensor  31   a  is a sensor detecting rpm of the travel drive source  31  to rotate the impeller  32 . The rotation sensor  31   a  provides a detection signal to the control device  60 . In this example, the rotation sensor  31   a  detects a crank angle of the travel drive source  31  to detect rpm of the travel drive source  31 . In response to rpm of the travel drive source  31 , the impeller  32  is rotated to generate propulsion. With an increase in rpm of the impeller  32 , the small planing watercraft  10  increases in speed, and can be in the planing state. Whether the small planing watercraft  10  is in the planing state can thus be determined based on output of detection of the rotation sensor  31   a . 
     The throttle valve  31   b  is a valve adjusting a quantity of an air-fuel mixture into the travel drive source  31 . The control device  60  adjusts a degree of opening of the throttle valve  31   b . By adjusting the quantity of the air-fuel mixture into the travel drive source  31 , output of the travel drive source  31  can be adjusted. For example, when an accelerator provided to the handle  22  is operated, a signal in response to the operation is provided to the control device  60 . The control device  60  controls the degree of opening of the throttle valve  31   b  in response to the operation performed on the accelerator. As will be described below, the degree of opening of the throttle valve  31   b  is sometimes restricted regardless of operation performed on the accelerator. 
     Example of Display of Display Device 
       FIG.  5    illustrates an example of display of the display device  48 . The display device  48  displays information to provide notification that the lid  56  is open in response to a control command from the control device  60 . In this respect, the display device  48  is one example of a notification device providing notification that the lid  56  is open. 
     For example, a display screen  49  of the display device  48  includes a gear position display region  49   a , a travel information display region  49   b , a trim angle display region  49   d , an oil level display region  49   e , a fuel level display region  49   f , and a lid open state display region  49   g . In addition to the opening and closing sensor  59  and the rotation sensor  31   a  described above, a speed sensor, a trim angle detection sensor, a fuel level detection sensor, an oil level detection sensor, and a lever or a switch for rearward movement or a stop are connected to the control device  60 . The control device  60  can thus generate a signal to display each of the above-mentioned regions. 
     An example of the layout of the regions of the display screen  49  is as follows. The travel information display region  49   b  is the largest region expanding leftward and downward from a central portion of the display screen  49 . Speed information  49   b   1  and engine rpm information  49   b   2  are displayed in the travel information display region  49   b . The gear position display region  49   a  is located above the travel information display region  49   b  of the display screen  49 . Information indicating any of forward movement, rearward movement, and a stop is displayed in the gear position display region  49   a . The trim angle display region  49   d  is provided to the right of the gear position display region  49   a . Information indicating a trim angle of the body  12  is displayed in the trim angle display region  49   d . The oil level display region  49   e  and the fuel level display region  49   f  are displayed to the right of the travel information display region  49   b . A level of lubricating oil of the internal combustion engine is displayed in the oil level display region  49   e , and a level of fuel of the internal combustion engine is displayed in the fuel level display region  49   f . 
     The lid open state display region  49   g  is located below the oil level display region  49   e . Lid open state warning representation  49   g   1 , left open state identification representation  49   g   2 , and right open state identification representation  49   g   3  are displayed in the lid open state display region  49   g . The lid open state warning representation  49   g   1  is representation to provide notification that the lid  56  is open. The lid open state warning representation  49   g   1  is, for example, characters “STRAGE OPEN!”. The lid open state warning representation  49   g   1  may be a graphic, a symbol, or the like indicating that the lid  56  is open. By causing the information to blink or be lit, notification that the lid  56  is open is visually provided. 
     The left open state identification representation  49   g   2  is representation to provide notification that the left lid  56  is open after identification thereof. The right open state identification representation  49   g   3  is representation to provide notification that the right lid  56  is open after identification thereof. The left open state identification representation  49   g   2  is located to the left of the right open state identification representation  49   g   3 , and the right open state identification representation  49   g   3  is located to the right of the left open state identification representation  49   g   2 . By causing one or both of the left open state identification representation  49   g   2  and the right open state identification representation  49   g   3  to be lit or blink, opening of one or both of the left lid  56  and the right lid  56  is recognizable from a relative positional relationship between the representation  49   g   2  and the representation  49   g   3 . The left open state identification representation  49   g   2  and the right open state identification representation  49   g   3  may each be another type of representation, such as characters and a graphic. 
     The layout and sizes of the regions of the display screen  49  are not limited to those in the above-mentioned example, and may be any layout and any sizes. At least one of the lid open state warning representation  49   g   1 , the left open state identification representation  49   g   2 , and the right open state identification representation  49   g   3  may be displayed by a light emitting display device, such as a light emitting diode and an electric bulb. 
     Example of Processing 
       FIG.  6    is a flowchart showing an example of processing of the control device  60 . The processing is performed in parallel with or in quasi-parallel with processing performed by the control device  60  for travel of the small planing watercraft  10 , for example. 
     As shown in step S 1 , whether startup of the travel drive source  31  is initiated is determined. For example, due to operation to turn on a main switch and an ignition operation performed by the operator P, a starter motor of the travel drive source is rotated, and a crankshaft of the travel drive source  31  is rotated. With rotation of the crankshaft, the air-fuel mixture is taken into a combustion chamber of the travel drive source  31 , and the air-fuel mixture in the combustion chamber is ignited to initiate startup of the travel drive source  31 . The control device  60  compares rpm of the travel drive source  31  with predetermined reference rpm based on output of detection of the rotation sensor  31   a  in response to rotation of the crankshaft. The reference rpm is set to be smaller than idling rpm of the internal combustion engine as the travel drive source  31 , for example. It is determined that the travel drive source  31  is started when the detected rpm exceeds the reference rpm. When the detected rpm is the same as the reference rpm, it may or may not be determined that the travel drive source  31  is started. Processing in step S 1  is repeated when it is determined that the travel drive source  31  is not started. Processing proceeds to step S 2  when it is determined that the travel drive source  31  is started. 
     In step S 2 , a state of the opening and closing sensor  59  is acquired based on a result of detection in response to the detection signal from the opening and closing sensor  59 . When the lid  56  is open, the point of contact in the opening and closing sensor  59  is opened, and an off signal is input, and, when the lid  56  is closed, the point of contact in the opening and closing sensor  59  is closed, and an on signal is input, for example. In a case where the lid  56  is provided in each of left and right side portions of the body  12 , a state of each of left and right opening and closing sensors  59  corresponding to the left and right lids  56  is acquired. 
     In next step S 3 , whether the lid  56  is open is determined based on the result of detection of the opening and closing sensor  59 . In a case where the lid  56  is provided in each of the left and right side portions of the body  12 , whether at least one of the left and right lids  56  is open is determined. Processing proceeds to step S 4  when it is determined that the lid  56  is open, and proceeds to step S 10  when it is determined that the lid  56  is not open. For example, a signal output from a determination circuit as the processing circuitry of the control device to another circuit, such as a register, for next processing when it is determined that the lid  56  is open in step S 3  can be understood as one example of an output signal indicating that the lid  56  is open. 
     When processing proceeds to step S 4 , whether the left lid  56  is open is determined. Processing proceeds to step S 5  when it is determined that the left lid  56  is open, and proceeds to step S 6  while skipping step S 5  when it is determined that the left lid  56  is not open. 
     In step S 5 , a left notification signal is output as a signal indicating that the left lid  56  is open. The left notification signal is provided to the display device  48 . The display device  48  displays the lid open state warning representation  49   g   1  and the left open state identification representation  49   g   2  so that they are lit or blink in response to the left notification signal. 
     In next step S 6 , whether the right lid  56  is open is determined. Processing proceeds to step S 7  when it is determined that the right lid  56  is open, and proceeds to step S 8  while skipping step S 7  when it is determined that the right lid  56  is not open. 
     In step S 7 , a right notification signal is output as a signal indicating that the right lid  56  is open. The right notification signal is provided to the display device  48 . The display device  48  displays the lid open state warning representation  49   g   1  and the right open state identification representation  49   g   3  so that they are lit or blink in response to the right notification signal. One or more of the lids  56  that are open are identified, and notification that the identified lids  56  are open is provided in steps S 4  to S 7 . 
     In next step S 8 , the control device  60  sets a travel mode of the small planing watercraft  10  to a second travel mode. That is to say, when it is determined that the lid  56  is open in step S 3 , processing in step S 8  is performed after processing in steps S 4  to S 7  is performed, and, as a result, the travel mode is set to the second travel mode. On the other hand, when it is determined that the lid  56  is not open in step S 3 , processing proceeds to step S 10 , and the travel mode of the small planing watercraft  10  is set to a first travel mode. 
     The first travel mode and the second travel mode are modes in which output of the travel drive source  31  that can affect the speed of the small planing watercraft  10  is changed. Output of the travel drive source  31  in the second travel mode is suppressed relative to output of the travel drive source  31  in the first travel mode. Output of the travel drive source  31  can be evaluated by rpm of the travel drive source  31 , for example. Thus, the first travel mode may be a mode in which maximum rpm of the travel drive source  31  is not restricted, and the second travel mode may be a mode in which maximum rpm of the travel drive source  31  is restricted, for example. In this case, in the first travel mode, the control device  60  adjusts the degree of opening of the throttle valve  31   b  in response to operation of a throttle to control propulsion for the travel drive source  31 , for example. The small planing watercraft  10  can thus travel in response to original propulsion for the travel drive source  31 , and, for example, can plane. In the second travel mode, the control device  60  adjusts the degree of opening of the throttle valve  31   b  in response to operation of the throttle to control propulsion for the travel drive source  31 , for example. In this case, the control device  60  determines whether rpm of the travel drive source  31  has exceeded predetermined maximum rpm based on a result of detection of the rotation sensor  31   a , and, when a result of determination is affirmative, maintains or reduces the degree of opening of the throttle valve  31   b  regardless of operation of the throttle. When the result of determination is negative, the control device  60  controls the degree of opening of the throttle valve  31   b  in response to operation of the throttle. When rpm of the travel drive source  31  is the same as the maximum rpm, the result of determination may be affirmative or negative. Output of the travel drive source  31  in the second travel mode is thus suppressed relative to output of the travel drive source  31  in the first travel mode. 
     The above-mentioned maximum rpm is only required to be set as rpm in response to a reference speed of the small planing watercraft  10 , for example. The reference speed may be set in a range of 0 km/h to 10 km/h, for example. The reference speed may be set in a range in which the small planing watercraft  10  cannot plane. Rpm in response to the reference speed can theoretically and experimentally be determined in response to the shape and the weight of the small planing watercraft  10 , the properties of the propulsion device, and the like. Suppression of output of the travel drive source  31  in the second travel mode is not required to be controlled in response to rpm of the travel drive source  31 . For example, restriction processing to maintain or reduce the degree of opening of the throttle valve  31   b  regardless of operation of the throttle may be performed when the speed of the small planing watercraft  10  has exceeded the reference speed based on output of the speed sensor of the small planing watercraft  10 . When the speed of the small planing watercraft  10  is the same as the reference speed, the restriction processing may or may not be performed. 
     The maximum rpm of the travel drive source  31  may be restricted also in the first travel mode. In this case, the maximum rpm in the second travel mode is set to have a smaller value than the maximum rpm in the first travel mode. A maximum degree of opening of the throttle valve  31   b  in the second travel mode may be restricted to have a smaller value than the maximum degree of opening of the throttle valve  31   b  in the first travel mode not based on a detected value of rpm of the travel drive source  31  or the speed of the small planing watercraft  10 . 
     In the first travel mode, the lid  56  is closed, so that the object 8 inside the storage box  50  is less likely to fall out even if the small planing watercraft  10  rolls. Furthermore, ingress of water into the storage box  50  is less likely to occur even if waves or wave splashes are made around the small planing watercraft  10 . In the second travel mode, output of the travel drive source  31  is suppressed, so that the small planing watercraft  10  is less likely to roll, and waves or wave splashes are less likely to be made around the small planing watercraft  10 . A fall of the object 8 inside the storage box  50   and ingress of water into the storage box  50  are thus prevented. 
     Processing proceeds to step S 9  after processing in step S 8  and processing in step S 10  are performed. The internal combustion engine is stopped by operation to stop operation (e.g., kill switch operation) performed by the operator. In step S 9 , whether the travel drive source  31  as the internal combustion engine is stopped is determined. For example, the control device  60  determines whether the travel drive source  31  is stopped based on rpm of the travel drive source  31  based on the result of detection of the rotation sensor  31   a . Processing returns to step S 2  to repeat processing in and after step S 2  when it is determined that the travel drive source  31  is not stopped. Processing to set the travel mode to the second travel mode when it is determined that the lid  56  is open and set the travel mode to the first travel mode when it is determined that the lid  56  is not open is thus repeated. Processing ends when it is determined that the travel drive source  31  is stopped in step S 9 . 
     According to the small planing watercraft  10  having a configuration as described above or the processing method for the small planing watercraft  10 , the notification signal indicating that the lid  56  is open is output when it is determined that the lid  56  is open. Notification to the operator P, control of travel, or the like can thus be provided based on the signal indicating that the lid  56  is open. Planing of the small planing watercraft  10  with the lid  56  being open, which can cause a fall of the object  8  inside the storage box  50  in water and difficult retrieval thereof, and ingress of water into the storage box  50 , is thus less likely to occur. 
     The display device  48  is caused to provide notification that the lid  56  is open when it is determined that the lid  56  is open. A user, such as the operator P, can thus easily know that the lid  56  is open, and take measures, for example, to close the lid  56 . 
     One or more of the lids  56  that are open are identified, and the display device  48   is caused to provide notification that the identified lids  56  are open. The user, such as the operator P, can thus easily know the one or more of the lids  56  that are open, and close the lids  56  to be closed. 
     The travel mode of the small planing watercraft  10  is switchable between the first travel mode and the second travel mode, and is set to the second travel mode when it is determined that the lid  56  is open. The small planing watercraft  10  can thus travel with output being suppressed as defined in the second travel mode when the lid  56  is open. Ingress of water into the storage box  50  and a fall of the object  8  out of the storage box  50  are thus suppressed. Furthermore, a roll and a pitch of the small planing watercraft  10  with the lid  56  being open is prevented. In contrast, when the lid  56  is closed, the small planing watercraft  10  can travel using original propulsion for the travel drive source  31 . 
     When it is determined that the lid  56  is open, the display device  48  is caused to provide notification that the lid  56  is open, and the travel mode is set to the second travel mode, so that the user, such as the operator P, can understand that the travel mode is set to the second travel mode in which output is suppressed because the lid  56  is open. The user can thus easily take measures, for example, to close the lid  56  as measures to recover the suppressed output. 
     In a case where the opening  50   h  of the storage box  50  opens orthogonally to the up-down direction in the small planing watercraft  10 , the object 8 inside the storage box  50  is likely to fall out, and ingress of water into the storage box  50  is likely to occur. A configuration to determine opening of the lid  56  is thus effective in a case where the opening  50   h  of the storage box  50  opens orthogonally to the up-down direction. 
     Assuming planing with the opening  50   h  of the storage box  50  being open, ingress of water into the storage box  50  is likely to occur due to waves in a case where the opening  50   h  of the storage box  50  is located forward of the handle  22  than in a case where the opening  50   h  of the storage box  50  is located rearward of the handle  22 . Ingress of water is thus likely to be suppressed by determining whether the lid  56  is open in a case where the opening  50   h  of the storage box  50  is located forward of the handle  22 . In a case where the opening  50   h  of the storage box  50  is located forward of the handle  22 , the open or closed state of the lid  56  can be viewed over the handle  22 . 
     Whether the lid  56  is open is determined based on the result of detection of the opening and closing sensor  59  when it is determined that the travel drive source  31  is started, so that whether the lid  56  is open is determined from an early stage of the start of travel. Since whether the lid  56  is open is determined immediately after the start of the travel drive source  31 , ingress of water into the storage box  50  and a fall of the object  8  out of the storage box  50  are more surely suppressed. 
     The opening and closing sensor  59  is the contact sensor detecting contact between the lid  56  and the opening  50   h , so that opening of the lid  56  can be detected by contact. 
     Ingress of water into the storage box  50  can be prevented by the lid  56  having the outer surface  56   f  as a portion of the outer surface of the body  12 . 
     The small planing watercraft  10  includes the seat  18  straddled by the operator P, and the body  12  is turnable while rolling, so that the object  8  inside the storage box  50  is likely to fall out if the storage box  50  is open when the body  12  rolls. By determining whether the lid  56  is open when the body  12  rolls as described above, a fall of the object 8 is easily prevented. 
     Second Embodiment 
     A small planing watercraft  10  and a processing method for the small planing watercraft  10  in a second embodiment will be described below.  FIG.  7    is a flowchart showing an example of processing of a control device in the second embodiment. Differences from processing in the above-mentioned first embodiment will mainly be described. 
     Steps S 1  to S 7  and S 9  are the same as steps S 1  to S 7  and S 9  in the first embodiment except for the following points. 
     That is to say, step S 8  in the first embodiment is omitted. Processing thus proceeds to step S 9  after step S 7 . Step S 10  in the first embodiment is also omitted. Processing thus proceeds to step S 9  when it is determined that the lid  56  is not open in step S 3 . In the second embodiment, processing in steps S 8  and S 10  may be performed as in the first embodiment. 
     Steps S 21  and S 22  to determine whether the small planing watercraft  10  has transitioned to the planing state are added between steps S 1  and S 2 . 
     Processing proceeds to step S 21  when it is determined that the travel drive source  31  is started in step S 1 . A detected value of the rotation sensor  31   a  is acquired in step S 21 . 
     In next step S 22 , whether the small planing watercraft  10  has transitioned to the planing state is determined based on rpm of the travel drive source  31  based on the result of detection of the rotation sensor  31   a . Rpm of the travel drive source  31  has a positive correlation with the speed of the small planing watercraft  10 , and the speed of the small planing watercraft  10  can be considered to be the speed in the planing state of the small planing watercraft  10  when rpm of the travel drive source  31  exceeds a predetermined threshold. When rpm of the travel drive source  31  is the same as the predetermined threshold, it may or may not be determined that the small planing watercraft  10  is in the planing state. Whether the small planing watercraft  10  is in the planing state may be determined based on the speed detected by the speed sensor. 
     Processing proceeds to step S 2  when it is determined that the small planing watercraft  10  is in the planing state in step S 22 , and proceeds to step S 9  when it is determined that the small planing watercraft  10  is not in the planing state in step S 22 . 
     Due to addition of steps S 21  and S 22  described above, processing returns not to step S 2  but to step S 21  when it is determined that the internal combustion engine is stopped in step S 9 . Thus, at all times during operation of the travel drive source  31  of the small planing watercraft  10 , whether the small planing watercraft  10  is in the planing state is determined, and, when it is determined that the small planing watercraft  10  is in the planing state, whether the lid  56  is open is determined based on the result of detection of the opening and closing sensor  59 . 
     According to the second embodiment, an effect similar to the effect obtained in the above-mentioned first embodiment can be obtained except for the effect obtained by setting of the mode. In addition, whether the lid is open is determined at transition to the planing state. Operation to provide notification that the lid  56  is open and the like can be performed in the planing state in which a fall of the object 8 out of the storage box  50  and ingress of water into the storage box  50  are more likely to occur than in a non-planing state. 
     Modifications 
     An example in which the storage boxes  50  and the lids  56  are disposed in the opposite side portions of the front  14   a  is shown in the above-mentioned embodiments. The positions of the storage boxes and the lids are not limited to those in the above-mentioned example. For example, each of the storage boxes and the lids may be disposed in a central portion along the width of a front portion of the front, in a side or rear portion of the central protrusion  14   b , in the side floors  14   c , or in the rear floor  14   d . 
     The opening and closing sensor  59  may not be the contact sensor described in the embodiments. The opening and closing sensor may be an optical sensor detecting opening and closing of the lid  56  depending on whether there is a shield for detected light in response to the open or closed state of the lid  56 . The opening and closing sensor may be a magnetic sensor detecting a magnetic substance attached to the lid  56 . The opening and closing sensor may be an angle sensor detecting an opening and closing angle of the hinge  58 . In a case where a latch locking the lid  56  in the closed state is assembled to the opening  50   h  or the lid  56 , the opening and closing sensor may be a sensor detecting a posture of the latch in which the lid is locked in the closed state. That is to say, the opening and closing sensor may be any sensor detecting the open or closed state of the lid  56  depending on the position or movement of the lid  56  relative to the opening  50   h  or a state of each component synchronized with the position or movement. 
     In the above-mentioned embodiments, whether the small planing watercraft  10  is in the planing state is determined by rpm detected by the rotation sensor  31   a . Whether the small planing watercraft  10  is in the planing state may be determined based on output of another sensor. For example, the small planing watercraft  10  is considered to be in the planing state as the speed of the small planing watercraft  10  increases. Thus, in a case where the small planing watercraft  10  includes the speed sensor, whether the small planing watercraft  10  is in the planing state may be determined based on output of the speed sensor. The small planing watercraft  10  is considered to be in an upward inclined posture when the small planing watercraft  10  is in the planing state. Thus, in a case where the small planing watercraft  10  includes a trim angle sensor detecting the trim angle around a pitch axis, whether the small planing watercraft  10  is in the planing state may be determined based on output of the trim angle sensor. 
     An example in which the display device  48  is the notification device providing notification that the lid  56  is open is described in the above-mentioned embodiments. The notification device may not be a notification device visually providing notification. For example, the notification device may be a notification device providing notification using a sounding body emitting a buzzer sound or a notification voice. 
     In the first embodiment, both the processing to provide notification as in steps S 5  and S 7  and the processing to change the mode as in steps S 9  and S 10  may not necessarily be performed, and only one of them may be performed. Similarly, in the second embodiment, in addition to or in place of the processing to provide notification as in steps S 5  and S 7 , the processing to change the mode as in steps S 9  and S 10  may be performed. 
     Configurations described in the above-mentioned embodiments and modifications can be combined with each other as appropriate unless any contradiction occurs. 
     Additional Remark 
     The functionality of the elements disclosed herein may be implemented using circuitry or processing circuitry which includes general purpose processors, special purpose processors, integrated circuits, ASICs (“Application Specific Integrated Circuits”), conventional circuitry and/or combinations thereof which are configured or programmed to perform the disclosed functionality. Processors are considered processing circuitry or circuitry as they include transistors and other circuitry therein. In the disclosure, the circuitry, units, or means are hardware that carry out or are programmed to perform the recited functionality. The hardware may be any hardware disclosed herein or otherwise known which is programmed or configured to carry out the recited functionality. When the hardware is a processor which may be considered a type of circuitry, the circuitry, means, or units are a combination of hardware and software, the software being used to configure the hardware and/or processor. 
     The present application discloses the following aspects. 
     A first aspect is a small planing watercraft including: a body including a storage box and a lid, the storage box including an opening, the lid releasably closing the opening; an opening and closing sensor detecting opening and closing of the lid; and processing circuitry determining whether the lid is open based on a result of detection of the opening and closing sensor, and, when determining that the lid is open, outputting a signal indicating that the lid is open. 
     According to the first aspect, notification to an operator, control of travel, or the like can be provided based on the signal indicating that the lid is open. 
     A second aspect is the small planing watercraft according to the first aspect further including a notification device, wherein, when determining that the lid is open, the processing circuitry causes the notification device to provide notification that the lid is open. 
     As described above, the notification device can notify a user that the lid is open. 
     A third aspect is the small planing watercraft according to the second aspect, wherein the storage box of the body includes storage boxes, and the lid of the body includes lids, and, when determining that the lid is open, the processing circuitry identifies one or more of the lids that are open, and causes the notification device to provide notification that the identified lids are open. 
     The user can thus know the one or more of the lids that are open. 
     A fourth aspect is the small planing watercraft according to the first aspect, wherein a travel mode of the small planing watercraft is switchable between a first travel mode and a second travel mode in which output is suppressed relative to the first travel mode, and, when determining that the lid is open, the processing circuitry sets the travel mode to the second travel mode. 
     In this case, the small planing watercraft can travel with output being suppressed as defined in the second travel mode when the lid is open. Ingress of water into the storage box and a fall of an object out of the storage box are thus suppressed. 
     A fifth aspect is the small planing watercraft according to the first aspect further including a notification device, wherein a travel mode of the small planing watercraft is switchable between a first travel mode and a second travel mode in which output is suppressed relative to the first travel mode, and, when determining that the lid is open, the processing circuitry causes the notification device to provide notification that the lid is open, and sets the travel mode to the second travel mode. 
     In this case, the small planing watercraft can travel with output being suppressed as defined in the second travel mode when the lid is open. Ingress of water into the storage box and the fall of the object out of the storage box are thus suppressed. Furthermore, the user can understand that the travel mode is set to the second travel mode because the lid is open. The user can thus easily take measures to recover the suppressed output. 
     A sixth aspect is the small planing watercraft according to the first aspect, wherein the opening of the storage box opens orthogonally to an up-down direction. 
     Notification to the operator, control of travel, or the like can thus be provided when ingress of water into the storage box from the side and a fall out of the object are likely to occur. 
     A seventh aspect is the small planing watercraft according to the first aspect further including a handle supported on the body, wherein the opening of the storage box is located forward of the handle. 
     Assuming planing with the opening of the storage box being open, ingress of water into the storage is likely to occur due to waves in a case where the opening of the storage box is located forward of the handle than in a case where the storage box is formed at a position rearward of the handle. Ingress of water is thus likely to be suppressed by outputting the signal indicating that the lid is open in a case where the storage box into which ingress of water is likely to occur as described above is provided. 
     An eighth aspect is the small planing watercraft according to the first aspect further including a drive source generating propulsion power as a travel drive source, wherein, when it is determined that the drive source is started, the processing circuitry determines whether the lid is open based on the result of detection of the opening and closing sensor. 
     Whether the lid is open is thus determined when an internal combustion engine is started. 
     A ninth aspect is the small planing watercraft according to the first aspect further including a drive source generating propulsion power as a travel drive source, wherein, when it is determined that the small planing watercraft transitions to a planing state, the processing circuitry determines whether the lid is open based on the result of detection of the opening and closing sensor. 
     Whether the lid is open is thus determined at transition to the planing state in which a fall of the object out of the storage box and ingress of water into the storage box are likely to occur. 
     A tenth aspect is the small planing watercraft according to the first aspect, wherein the opening and closing sensor is a contact sensor detecting contact between the lid and the opening. 
     In this case, opening of the lid can be detected by contact. 
     An eleventh aspect is the small planing watercraft according to the first aspect, wherein an outer surface of the lid is a portion of an outer surface of the body. 
     In this case, ingress of water into the storage box can be prevented by the lid having the outer surface as the portion of the outer surface of the body. 
     A twelfth aspect is the small planing watercraft according to the first aspect further including a seat straddled by the operator, wherein the body is turnable while rolling. 
     The object inside the storage box is likely to fall out if the storage box is open when the body rolls. By providing the opening and closing sensor to the body, the fall of the object is easily prevented. 
     A thirteenth aspect is a processing method for a small planing watercraft including a storage box and a lid, the storage box including an opening, the lid releasably closing the opening, the processing method including: detecting opening and closing of the lid; determining whether the lid is open based on a result of detection; and, when determining that the lid is open, setting a travel mode to a second travel mode in which output is suppressed relative to a first travel mode. 
     Ingress of water into the storage box and the fall of the object out of the storage box are thus suppressed. 
     A fourteenth aspect is a processing method for a small planing watercraft including a storage box and a lid, the storage box including an opening, the lid releasably closing the opening, the processing method including: detecting opening and closing of the lid; determining whether the lid is open based on a result of detection; and, when determining that the lid is open, providing notification that the lid is open. 
     The operator can thus be notified that the lid is open. 
     The foregoing description is in all aspects illustrative and not restrictive. It is therefore understood that numerous unillustrated modifications can be devised without departing from the scope of the invention.