Abstract: A navigation control system includes an obstacle detector on a hull to detect a distance from a hull to an obstacle on a water surface and a position of the obstacle, a thruster on the hull to generate a propulsive force, a steering to steer the thruster to right and left sides of the hull, and a controller configured or programmed to perform a control to determine an obstacle avoidance route based on a route function including at least an indicator of a lateral acceleration that acts on the hull during steering of the thruster when the obstacle is detected by the obstacle detector.

Abstract: A marine propulsion system includes a controller configured or programmed to perform a marine vessel traveling direction control such that a traveling direction of a marine vessel is changed to a predetermined angle equal to or greater than a first angle with respect to a traveling direction of waves toward the marine vessel when the traveling direction of the marine vessel is less than the first angle with respect to the traveling direction of the waves toward the marine vessel.

Abstract: A marine vessel maneuvering system includes a controller configured or programmed to perform a water entry determination control to determine whether or not water behind a hull that rises above a water surface due to deceleration of the hull may enter the hull when the hull is decelerating.

Abstract: In a boat including a hull, when the hull is moved laterally based on an output from the outboard motor, the hull rolls, which may cause discomfort to a user or passengers. To compensate for this, a lateral movement control method for the boat including the hull and the outboard motor includes generating a propulsion force to laterally move the hull with the output of the outboard motor, and executing a roll reduction process to reduce a roll angle of the hull at a time of laterally moving the hull.

Abstract: An apparatus for judging presence or absence of an abnormality of a marine vessel includes a controller configured or programmed to function as an estimating unit to estimate a marine vessel speed and a pitch angle of a hull of the marine vessel based on a propulsion force of a marine vessel propulsion device and an attitude of the marine vessel propulsion device and a judging unit, and a measuring unit to measure an actual marine vessel speed and an actual pitch angle. The judging unit judges the presence or absence of the abnormality based on at least one of a comparison result between the estimated marine vessel speed estimated by the estimating unit and the actual marine vessel speed measured by the measuring unit or a comparison result between the estimated pitch angle estimated by the estimating unit and the actual pitch angle measured by the measuring unit.

Abstract: A marine vessel includes a hull, left and right propulsion devices attached to a stern of the hull, left and right drive units to change a rotation angle of the left and right propulsion devices about left and right tilt shafts, and to set an angle at which a position of a lower portion of the left and right propulsion devices becomes highest as a maximum rotation angle, left and right lift mechanisms to change a vertical position of the left and right propulsion devices with respect to the hull, and a controller configured or programmed to function as a judging unit to judge whether or not a displacement in a roll direction of the hull has occurred, and a control unit to control the left and right drive units and the left and right lift mechanisms.

Abstract: An outboard motor includes a bracket, an upper case, a lower case, a drive shaft, a propeller shaft, a cooling water passage, a water pump, and an electric motor. The outboard motor is attached to a watercraft via the bracket. The upper case is below the engine. The lower case is below the upper case. The drive shaft is in the upper case and the lower case. The propeller shaft is connected to the drive shaft. The propeller shaft is in the lower case. The cooling water passage is connected to the engine. The cooling water passage is in the upper case and the lower case. The water pump is below a lower end of the bracket to deliver cooling water to the engine through the cooling water passage. The electric motor is operable to drive the water pump.

Abstract: An outboard motor includes an upper case, a lower case, a transmission, a clutch, a cooling water passage, a first pump, and a second pump. The transmission is operable to transmit the driving force of the engine. The clutch is connected to the transmission. The cooling water passage is connected to the engine. The cooling water passage is located in the upper case and the lower case. The first pump is connected to the transmission via the clutch. The first pump is driven by the driving force of the engine to send cooling water to the engine through the cooling water passage. The second pump is connected to the transmission. The second pump is driven by the driving force of the engine to send the cooling water to the engine through the cooling water passage.

Abstract: An outboard motor includes an engine, an upper case, a lower case, a cavitation plate, a transmission, a cooling water passage, a first pump, and a second pump. The transmission includes a drive shaft and a propeller shaft. The cooling water passage is connected to the engine and located in the upper case and the lower case. The first pump is above the cavitation plate. The first pump is connected to the drive shaft and operable to send cooling water to the engine through the cooling water passage. The second pump is drivable by the driving force from the transmission to send the cooling water to the engine through the cooling water passage.

Abstract: An outboard motor includes a bracket, an engine, an upper case, a lower case, a cavitation plate, a transmission, a cooling water passage, a first pump, and a second pump. The transmission includes a drive shaft and a propeller shaft. The cooling water passage is connected to the engine and located in the upper case and the lower case. The first pump is below a lower end of the bracket. The first pump is connected to the transmission and operable to send cooling water to the engine through the cooling water passage. The first pump is a non-positive displacement pump. The second pump is driven by a driving force from the transmission and operable to send the cooling water to the engine through the cooling water passage.

Abstract: A marine propulsion device includes a drive shaft, a propeller shaft, and a lower case that houses the propeller shaft. In the marine propulsion device, a power generator generates power using a torque of the drive shaft or the propeller shaft, and the generated power is supplied to an electric actuator to drive a driven unit through a first power line, wherein the electric actuator is controlled by a controller. At least a portion of the driven unit, at least a portion of the electric actuator, at least a portion of the power generator, and the first power line are located in the lower case.

Abstract: A marine propulsion device includes a first gear, a second gear, a third gear, a case, a partition wall, and a first flow path. The case includes an internal space in which the first gear, the second gear, and the third gear are located. The partition wall is located between the second gear and the third gear in the internal space. The partition wall partitions the internal space into a first space and a second space. The second gear is located in the first space. The third gear is located in the second space. The first flow path communicates the first space with the second space. The first flow path is located on a same side as the first gear with respect to a center line of the second gear and the third gear.

Abstract: A marine propulsion system includes a marine propulsion device, a battery, and a controller. The marine propulsion device includes a propeller shaft, an engine, and an electric motor. The marine propulsion device transmits mechanical power from at least one of the engine and the electric motor to the propeller shaft. The battery supplies electric power to the electric motor. The controller controls the marine propulsion device such that the marine propulsion device is switchable among drive modes including a first drive mode and a second drive mode. In the first drive mode, mechanical power is transmitted from only the engine to the propeller shaft. In the second drive mode, mechanical power is transmitted from only the electric motor to the propeller shaft when the engine is in an idling state.

Abstract: A vessel operation system includes an outboard motor or other propulsion apparatus disposed on a hull, a trolling motor mounted externally to the hull, a joystick or other first operator, and a controller. The joystick is operated by a vessel operator in order to indicate at least one of a magnitude and a direction of a thrust that the outboard motor is to apply to the hull. In a state in which the trolling motor is generating a first thrust, the controller controls the outboard motor so as to generate a second thrust in accordance with a command indicated by the joystick. Additionally, the controller controls the trolling motor so that the first thrust changes.

Abstract: A vessel operation system includes an outboard motor or other propulsion apparatus on a hull, an electrically-driven trolling motor mounted externally to the hull, and a controller configured or programmed to control the outboard motor and the trolling motor. The outboard motor generates a thrust and electric power with an engine. The trolling motor generates a thrust by being driven by electric power from a battery that is charged by the electric power generated by the outboard motor. In a state in which the trolling motor is generating the thrust, the controller is configured or programmed to control the outboard motor so as to generate an assist thrust that hastens a behavior of the hull by the thrust generated by the trolling motor.

Abstract: A control system includes an outboard motor, a sway sensor, and a controller. The outboard motor includes a power source and a propeller shaft. The power source includes a rotating shaft. The propeller shaft is connected to the rotating shaft. The sway sensor outputs a signal indicative of the sway of the boat. The controller is communicatively connected to the sway sensor. The controller receives the signal indicative of the sway of the boat. The controller controls at least one of a moment of inertia of the rotating shaft around the rotating shaft, a rotation speed of the rotating shaft, or a tilt angle of the rotating shaft according to the sway of the boat to generate an inertial force against the sway of the boat.

Abstract: A marine propulsion system includes a marine propulsion device, a battery, and a controller. The marine propulsion device includes a propeller shaft, an engine, and an electric motor. The marine propulsion device transmits mechanical power from at least one of the engine and the electric motor to the propeller shaft. The battery supplies electric power to the electric motor. The controller controls the marine propulsion device such that the marine propulsion device is switchable among drive modes including a first drive mode and a second drive mode. In the first drive mode, mechanical power is transmitted from only the engine to the propeller shaft. In the second drive mode, mechanical power is transmitted from only the electric motor to the propeller shaft when the engine is in an idling state.

Abstract: A control system includes an outboard motor, a sway sensor, and a controller. The outboard motor includes a power source and a propeller shaft. The power source includes a rotating shaft. The propeller shaft is connected to the rotating shaft. The sway sensor outputs a signal indicative of the sway of the boat. The controller is communicatively connected to the sway sensor. The controller receives the signal indicative of the sway of the boat. The controller controls at least one of a moment of inertia of the rotating shaft around the rotating shaft, a rotation speed of the rotating shaft, or a tilt angle of the rotating shaft according to the sway of the boat to generate an inertial force against the sway of the boat.

Abstract: An outboard motor includes a vapor separator tank, a downstream fuel supply path, a fuel pump that discharges a fuel in the vapor separator tank into the downstream fuel supply path, a downstream bypass path, and a downstream relief valve provided in the downstream bypass path. A first end of the downstream bypass path is connected to a downstream portion that is closer to the fuel injector than is the downstream check valve in the downstream fuel supply path, and a second end of the downstream bypass path is connected to an upstream portion between the downstream check valve and the vapor separator tank in the downstream fuel supply path. The downstream relief valve opens the downstream bypass path when a fuel pressure in a downstream region that is closer to the fuel injector than is the downstream check valve in the downstream fuel supply path exceeds a first predetermined value.

Abstract: An outboard motor includes a vapor separator tank, a downstream fuel supply path, a fuel pump that discharges a fuel in the vapor separator tank into the downstream fuel supply path, a downstream bypass path, and a downstream relief valve provided in the downstream bypass path. A first end of the downstream bypass path is connected to a downstream portion that is closer to the fuel injector than is the downstream check valve in the downstream fuel supply path, and a second end of the downstream bypass path is connected to an upstream portion between the downstream check valve and the vapor separator tank in the downstream fuel supply path. The downstream relief valve opens the downstream bypass path when a fuel pressure in a downstream region that is closer to the fuel injector than is the downstream check valve in the downstream fuel supply path exceeds a first predetermined value.