Abstract: Provided are an LP sensor that detects any one shift state from among forward, reverse and neutral, on the basis of an operation state of respective throttle levers corresponding to a plurality of engines, and a controller that controls the plurality of engines. The controller detects a simulated boat speed on the basis of the respective rotational speeds of the plurality of engines. When from a state in which the boat is operated by some engines from among the plurality of engines an attempt is made to operate the remaining engines being in a neutral shift state, the controller sets a shift-in prohibition flag of a corresponding engine, and prohibits shift-in control of the remaining engine, in a case where the simulated boat speed is higher than a first determination value.

Abstract: By obtaining an atmospheric pressure learning value by applying filtering to an estimated atmospheric pressure found from an estimated atmospheric pressure map in an atmospheric pressure learning region matched in advance, and by constantly updating this atmospheric pressure learning value, stable and highly reliable atmospheric pressure estimation can be achieved. Also, a pre-set parameter value or the last atmospheric pressure learning value is used as the initial atmospheric pressure value and an unstable intake pressure value at the engine start in a battery-less state is not used. Hence, it becomes possible to provide an estimated atmospheric pressure with which high drivability is achievable by fully exploiting the engine performance as soon as the engine is started.

Abstract: By obtaining an atmospheric pressure learning value by applying filtering to an estimated atmospheric pressure found from an estimated atmospheric pressure map in an atmospheric pressure learning region matched in advance, and by constantly updating this atmospheric pressure learning value, stable and highly reliable atmospheric pressure estimation can be achieved. Also, a pre-set parameter value or the last atmospheric pressure learning value is used as the initial atmospheric pressure value and an unstable intake pressure value at the engine start in a battery-less state is not used. Hence, it becomes possible to provide an estimated atmospheric pressure with which high drivability is achievable by fully exploiting the engine performance as soon as the engine is started.

Abstract: To propose a ship navigation control system that can easily and automatically switch between a target throttle opening for constant velocity navigation control and a target throttle opening corresponding to a lever operation amount of an operation lever. Throttle control means includes first computation means that computes a first target throttle opening for constant velocity navigation control of a ship based on a constant velocity navigation command using at least a ship velocity signal and a target ship velocity command signal, second computation means that computes a second target throttle opening corresponding to the lever operation amount, and a selection and output means that selects one having a smaller value of the first target throttle opening and the second target throttle opening and outputs the one as a throttle opening.

Abstract: To propose a ship navigation control system that can easily and automatically switch between a target throttle opening for constant velocity navigation control and a target throttle opening corresponding to a lever operation amount of an operation lever. Throttle control means includes first computation means that computes a first target throttle opening for constant velocity navigation control of a ship based on a constant velocity navigation command using at least a ship velocity signal and a target ship velocity command signal, second computation means that computes a second target throttle opening corresponding to the lever operation amount, and a selection and output means that selects one having a smaller value of the first target throttle opening and the second target throttle opening and outputs the one as a throttle opening.

Abstract: There is provided an idling rotation speed control apparatus that can reduce the development man-hours and the cost and that enables operation during a trolling cruise to be readily performed. The idling rotation speed control apparatus includes an engine rotation speed detection means, an engine temperature detection means, an engine idling driving state detection means, an engine load detection means, an intake air amount adjusting means for adjusting an amount of intake air during an idling state, and an ECU for controlling the intake air amount adjusting means during idling driving.

Abstract: There is provided an idling rotation speed control apparatus that can reduce the development man-hours and the cost and that enables operation during a trolling cruise to be readily performed. The idling rotation speed control apparatus includes an engine rotation speed detection means, an engine temperature detection means, an engine idling driving state detection means, an engine load detection means, an intake air amount adjusting means for adjusting an amount of intake air during an idling state, and an ECU for controlling the intake air amount adjusting means during idling driving.

Abstract: An engine control apparatus includes: an operation state determining unit determining whether the engine is in the running or the idle-state from a various sensor's signal; an engine revolution speed detecting unit detecting the revolution speed of the engine from a signal of an external sensor; a running time control value setting unit which sets an open/close control value for an ISC valve to be increased during the running-state such that the valve opens as the engine revolution speed is increased; and idle time control value setting units to which set the open/close control value such that the engine reaches a preset target revolution speed during the idle-state, and provide a lower limit value to the open/close control value during a predetermined period after the engine is switched from the running to the idle-state and set the control value not to be smaller than the lower limit value.

Abstract: An engine control apparatus includes: an operation state determining unit determining whether the engine is in the running or the idle-state from a various sensor's signal; an engine revolution speed detecting unit detecting the revolution speed of the engine from a signal of an external sensor; a running time control value setting unit which sets an open/close control value for an ISC valve to be increased during the running-state such that the valve opens as the engine revolution speed is increased; and idle time control value setting units to which set the open/close control value such that the engine reaches a preset target revolution speed during the idle-state, and provide a lower limit value to the open/close control value during a predetermined period after the engine is switched from the running to the idle-state and set the control value not to be smaller than the lower limit value.