Abstract: A controller controls a shift operation of a propulsion device between forward, neutral, and reverse, and steering of the propulsion device in accordance with a tilt operation of a joystick. The controller stores a control state of the propulsion device according to the tilt operation of the joystick when a switch is operated. The controller maintains the propulsion device in the control state even when the joystick is returned to the neutral position.

Abstract: A controller generates a first forward thrust with a first propulsion device and generates a first backward thrust with a second propulsion device with a same number as the first propulsion device in case that the backward thrust is less than a predetermined threshold. The controller generates a second forward thrust larger than the first forward thrust with the first propulsion device and generates a second backward thrust with each of the second propulsion devices greater than the first propulsion device in case that the backward thrust is greater than or equal to the predetermined threshold.

Abstract: A propulsive force suitable to hold a vessel at a target position is determined, by a controller that controls a propulsion device in a fixed point holding mode to hold the position of the vessel. The controller acquires a parameter including the position of the vessel or a vessel speed. The controller determines a target value for the parameter. The controller determines a demand output of the propulsion device within a predetermined upper limit value or less by feedback control according to a deviation between the parameter and the target value. The controller increases the upper limit value when the demand output of the propulsion device is greater than or equal to a first threshold. The first threshold is defined by a predetermined ratio with respect to the upper limit value.

Abstract: A vessel operation system includes a propulsion apparatus mountable on a hull of a vessel and that includes a prime mover, a steering to change a steering angle of a thrust generated by the propulsion apparatus with respect to the hull, a speed sensor to detect a speed corresponding to a traveling speed of the vessel or a rotational speed of the prime mover, and a controller configured or programmed to control the steering so as to change a maximum value of the steering angle in accordance with a speed data based on the speed detected by the speed sensor.

Abstract: A vessel operation system includes a propulsion apparatus to generate a forward thrust or a backward thrust by output of an engine, a throttle actuator to change a throttle opening degree of the engine, a first operator, a second operator, and a controller. When the propulsion apparatus generates a backward thrust, the controller sets a first target value within a range not more than a first upper limit value in accordance with an operation of the first operator and control the throttle actuator so that the throttle opening degree reaches the first target value. The controller sets a second target value within a range not more than a second upper limit value larger than the first upper limit value in accordance with an operation of the second operator and control the throttle actuator so that the throttle opening degree reaches the second target value.

Abstract: A controller controls a propulsion device such that a position of a watercraft is maintained in a front-and-back direction with respect to a standard line extending from a set point in a lateral direction while a direction of the watercraft is maintained along a standard direction defined as the direction of the set point. The controller determines whether or not the watercraft is moving away from the set point in the lateral direction. The controller changes the standard direction in a specific direction by controlling the propulsion device when the watercraft is moving away from the set point in the lateral direction. The controller changes the direction of the watercraft in accordance with the changed standard direction. The controller repeats determining whether or not the watercraft is moving, changing the standard direction, and changing the direction of the watercraft.

Abstract: A controller for a watercraft controls first and second marine propulsion devices to start moving the watercraft by setting a first default angle, a second default angle, and a default thrust ratio as a first target rudder angle, a second target rudder angle, and a target thrust ratio respectively when a desired motion of the watercraft is straight sideways movement. The controller determines at least one of a first correcting angle, a second correcting angle, and a correcting thrust ratio to reduce an error between the straight sideways movement of the watercraft and an actual motion of the watercraft. The controller corrects the first target rudder angle, the second target rudder angle, and the target thrust ratio with the first correcting angle, the second correcting angle, and the correcting thrust ratio, respectively. The controller repeatedly detects the error and repeatedly updates the correcting angles and the correcting thrust ratio.

Abstract: In a watercraft propulsion system, when a magnitude of a command value indicated by a propulsion signal falls within a first range in a composite operation, a controller controls a first outboard motor to increase a thrust in a propulsion direction and simultaneously causes a second outboard motor to reduce a thrust in an opposite direction. When the magnitude of the command value falls within a second range in the composite operation, the controller controls the first outboard motor to make the thrust in the propulsion direction greater than when the magnitude of the command value falls within the first range and simultaneously maintains the second outboard motor in a neutral state.

Abstract: The present disclosure relates to a propulsion control system (30) for controlling a marine vessel (10) comprising at least four propulsion units (20, 22, 24, 26). The marine vessel (10) comprises a longitudinal centre line (L) and a transversal line (T). The transversal line (T) extends in a direction perpendicular to the longitudinal centre line (L) and also extends through the steering axis of the aftmost of the propulsion units. The marine vessel (10) comprises four quadrants (I, II, III, IV) defined by the longitudinal centre line (L) and the transversal line (T) wherein a first (I) and a second (II) quadrant are located on the same side of said longitudinal centre line (L). When a combined sway and yaw motion is desired, the thrust of one propulsion unit is directed towards the second (I) quadrant, and the thrust of the other propulsion units is directed towards the first (II) quadrant.

Abstract: The present disclosure relates to a propulsion control system (30) for controlling a marine vessel (10) comprising at least four propulsion units (20, 22, 24, 26). The marine vessel (10) comprises a longitudinal centre line (L) and a transversal line (T). The transversal line (T) extends in a direction perpendicular to the longitudinal centre line (L) and also extends through the steering axis of the aftmost of the propulsion units. The marine vessel (10) comprises four quadrants (I, II, III, IV) defined by the longitudinal centre line (L) and the transversal line (T) wherein a first (I) and a second (II) quadrant are located on the same side of said longitudinal centre line (L). When a combined sway and yaw motion is desired, the thrust of one propulsion unit is directed towards the second (I) quadrant, and the thrust of the other propulsion units is directed towards the first (II) quadrant.

Abstract: A watercraft propulsion system includes a normal watercraft operating unit, a joy stick watercraft operating unit, a control unit, a control mode switching unit, and a detection unit. The normal watercraft operating unit includes throttle levers and a steering wheel. The throttle levers are used to adjust outputs of at least two propulsion machines mounted to a hull. The steering wheel is used to adjust rudder turning angles of the at least two propulsion machines. The joy stick watercraft operating unit includes a joy stick. The joy stick is used to move the hull in at least each of front, rear, left, and right directions. The control unit is configured and programmed to control the outputs and the rudder turning angles of the at least two propulsion machines in a normal mode in accordance with an operation of the normal watercraft operating unit or a joy stick mode in accordance with an operation of the joy stick watercraft operating unit.

Abstract: A watercraft propulsion system includes a normal watercraft operating unit, a joy stick watercraft operating unit, a control unit, a control mode switching unit, and a detection unit. The normal watercraft operating unit includes throttle levers and a steering wheel. The throttle levers are used to adjust outputs of at least two propulsion machines mounted to a hull. The steering wheel is used to adjust rudder turning angles of the at least two propulsion machines. The joy stick watercraft operating unit includes a joy stick. The joy stick is used to move the hull in at least each of front, rear, left, and right directions. The control unit is configured and programmed to control the outputs and the rudder turning angles of the at least two propulsion machines in a normal mode in accordance with an operation of the normal watercraft operating unit or a joy stick mode in accordance with an operation of the joy stick watercraft operating unit.

Abstract: An outboard motor control system includes a plurality of outboard motors, a vibration detecting section, and a control section. The outboard motors are mounted on a stern of a watercraft. Each of the outboard motors includes a propeller. The outboard motors are configured to be steered independently of one another. The vibration detecting section is configured to detect a vibration of the outboard motors. The control section is configured and programmed to execute a vibration suppression control when the vibration detecting section detects a vibration of the outboard motors. With the vibration suppression control, the control section is configured and programmed to change a propeller rotational axis direction and/or a propeller position of at least one of the outboard motors.

Abstract: A marine vessel steering system includes a basic target turning angle computing unit that computes a basic target turning angle ?o* common to two outboard motors based on a steering angle ? detected by a steering angle sensor. A traveling state determining unit determines whether a traveling state of a marine vessel is a straight traveling state based on the received basic target turning angle ?o*. When the traveling state of the marine vessel is determined as being the straight traveling state, a target turning angle computing unit determines, based on the basic target steering angle ?o* and a straight traveling toe angle ?s stored in a nonvolatile memory, target turning angles ?* of the two outboard motors such that a toe angle between the two outboard motors is equal to the straight traveling toe angle ?s.

Abstract: An outboard motor control system includes a plurality of outboard motors, a vibration detecting section, and a control section. The outboard motors are mounted on a stern of a watercraft. Each of the outboard motors includes a propeller. The outboard motors are configured to be steered independently of one another. The vibration detecting section is configured to detect a vibration of the outboard motors. The control section is configured and programmed to execute a vibration suppression control when the vibration detecting section detects a vibration of the outboard motors. With the vibration suppression control, the control section is configured and programmed to change a propeller rotational axis direction and/or a propeller position of at least one of the outboard motors.

Abstract: A marine vessel steering system includes a basic target turning angle computing unit that computes a basic target turning angle ?o* common to two outboard motors based on a steering angle ? detected by a steering angle sensor. A traveling state determining unit determines whether a traveling state of a marine vessel is a straight traveling state based on the received basic target turning angle ?o*. When the traveling state of the marine vessel is determined as being the straight traveling state, a target turning angle computing unit determines, based on the basic target steering angle ?o* and a straight traveling toe angle ?s stored in a nonvolatile memory, target turning angles ?* of the two outboard motors such that a toe angle between the two outboard motors is equal to the straight traveling toe angle ?s.

Abstract: A boat is capable of preventing shocks on gears in meshing engagement with each other and an abrupt movement thereof when a remote control shift lever is quickly rotated to reverse from a cruising mode. A control microcomputer is arranged to control the operation of a shift actuator based on the displacement of a remote control shift lever for remotely switching between forward, neutral, and reverse positions.

Abstract: To enable smooth, highly accurate deceleration in various usage conditions of an outboard motor and realize stabilized engine speed after deceleration, a fuel controller for controlling the amount of fuel fed to an engine of an outboard motor mounted on a boat includes a deceleration determining section arranged to determine deceleration of the boat, an engine speed detecting section arranged to detect the engine speed of the engine, an engine load detecting section arranged to detect the load on the engine, and a controller arranged to control the amount of fuel fed to the engine when the boat is in deceleration according to the detected engine speed and engine load.

Abstract: A boat is capable of preventing shocks on gears in meshing engagement with each other and an abrupt movement thereof when a remote control shift lever is quickly rotated to reverse from a cruising mode. A control microcomputer is arranged to control the operation of a shift actuator based on the displacement of a remote control shift lever for remotely switching between forward, neutral, and reverse positions.

Abstract: To enable smooth, highly accurate deceleration in various usage conditions of an outboard motor and realize stabilized engine speed after deceleration, a fuel controller for controlling the amount of fuel fed to an engine of an outboard motor mounted on a boat includes a deceleration determining section arranged to determine deceleration of the boat, an engine speed detecting section arranged to detect the engine speed of the engine, an engine load detecting section arranged to detect the load on the engine, and a controller arranged to control the amount of fuel fed to the engine when the boat is in deceleration according to the detected engine speed and engine load.