Fuel injection control for marine engine
AssigneeYamaha Marine Kabushiki Kaisha
InventorsIsao Kanno, Seiji Inoue
Life of this patent
Estimating the term…
Abstract
A watercraft has an engine that is controlled to reduce the likelihood of engine damage and rider discomfort when the watercraft engine speed is rapidly increased due to a lack of load on the propulsion unit. The engine is controlled by a method that detects engine speed and reduces the power output of the engine by varying degrees or restores the power output of the engine by varying degrees depending on the speed of the engine relative to plural predetermine speeds.
Claims17
A method of controlling a multi-cylinder marine engine associated with a watercraft, the method comprising injecting fuel into the engine for combustion therein, sensing a first engine speed, comparing the first sensed engine speed with a first predetermined speed, reducing fuel injection to at least a first cylinder if the first sensed engine speed is greater than the first predetermined speed, determining if the watercraft is airborne, and restoring fuel injection to the first cylinder if the watercraft is not airborne.
A watercraft comprising a hull, a multi-cylinder engine supported by the hull, a propulsion unit powered by the engine, and a controller configured to control at least fuel supply to the engine, the controller configured to detect a speed of the engine, compare the detected engine speed with a first predetermined speed, reduce fuel supply to at least a first cylinder of the engine if the detected engine speed is greater than a first predetermined speed, determine if the watercraft is airborne, and restore fuel supply to the at least first cylinder if the watercraft is not airborne.
A watercraft comprising a hull, a multi-cylinder engine supported by the hull, a propulsion unit powered by the engine, and means for detecting a speed of the engine, comparing the detected engine speed with a first predetermined speed, reducing fuel supply to at least a first cylinder of the engine if the detected engine speed is greater than a first predetermined speed, determining if the watercraft is airborne, and restoring fuel supply to the at least first cylinder if the watercraft is not airborne.
Dependencies are inferred from the claim text.