Method of and system for controlling marine propulsion device
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsTakuro Matsunami, Tomokatsu Terada, Keigo Kawasumi
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Abstract
A method of controlling a marine propulsion device including an engine including a plurality of cylinders and a crankshaft includes obtaining an angular acceleration of the crankshaft, obtaining a determination parameter to determine whether or not a misfire has occurred in the engine based on the angular acceleration of the crankshaft, and determining whether or not the misfire has occurred in the engine by comparing the determination parameter and a plurality of thresholds for each of the plurality of cylinders.
Claims8
A method of controlling a marine propulsion device including an engine including a plurality of cylinders and a crankshaft, the method comprising:
- obtaining an angular acceleration of the crankshaft;
- obtaining a determination parameter to determine whether or not a misfire has occurred in the engine based on the angular acceleration of the crankshaft;
- and
- determining whether or not the misfire has occurred in the engine by comparing the determination parameter and a plurality of thresholds for each of the plurality of cylinders;
- wherein
- the plurality of cylinders include a first cylinder and a second cylinder;
- the plurality of thresholds include a first threshold for the first cylinder and a second threshold for the second cylinder different from the first threshold;
- and
- the method further comprises:
- obtaining a first value of the determination parameter at an ignition timing in the first cylinder;
- obtaining a second value of the determination parameter at an ignition timing in the second cylinder;
- determining whether or not the misfire has occurred in the engine by comparing the first value and the first threshold;
- and
- determining whether or not the misfire has occurred in the engine by comparing the second value and the second threshold.
A system for controlling a marine propulsion device including an engine including a plurality of cylinders and a crankshaft, the system comprising:
- a sensor to detect an angular acceleration of the crankshaft;
- and
- a controller configured or programmed to:
- obtain the angular acceleration of the crankshaft;
- obtain a determination parameter to determine whether or not a misfire has occurred in the engine based on the angular acceleration of the crankshaft;
- and
- determine whether or not the misfire has occurred in the engine by comparing the determination parameter and a plurality of thresholds for each of the plurality of cylinders;
- wherein
- the plurality of cylinders include a first cylinder and a second cylinder;
- the plurality of thresholds include a first threshold for the first cylinder and a second threshold for the second cylinder different from the first threshold;
- and
- the controller is further configured or programmed to:
- obtain a first value of the determination parameter at an ignition timing in the first cylinder;
- obtain a second value of the determination parameter at an ignition timing in the second cylinder;
- determine whether or not the misfire has occurred in the engine by comparing the first value and the first threshold;
- and
- determine whether or not the misfire has occurred in the engine by comparing the second value and the second threshold.
Dependencies are inferred from the claim text.