Knocking control device for watercraft engine
AssigneeYamaha Marine Kabushiki Kaisha
InventorYoshihiro Mizushima
Life of this patent
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Abstract
A knocking control device for a watercraft engine includes a knocking learning value renewing section for changing a knocking learning value toward a low octane number ignition timing map when the knock sensor detects a knocking condition. The device changes the knocking learning value toward a high octane number ignition timing map when the knock sensor does not detect a knocking condition. An ignition timing determining section retards or advances an ignition timing based upon the knocking learning value given from the knocking learning value renewing section. The knocking learning value renewing section is constructed not to change the knocking learning value toward the high octane number ignition timing map, when an engine speed is in the vicinity of a full throttle condition.
Claims19
A knocking control device for a watercraft engine, comprising:
- a knock sensor configured to detect knocking in the engine;
- a knocking learning value renewing section configured to change a knocking learning value toward a low octane number ignition timing map when the knock sensor detects knocking, and to change the knocking learning value toward a high octane number ignition timing map when the knock sensor does not detect a knocking;
- and
- an ignition timing determining section that is configured to retard or advance an ignition timing based upon the knocking learning value given from the knocking learning value renewing section;
- wherein the knocking learning value renewing section is configured not to change the knocking learning value toward the high octane number ignition timing map when an engine speed is in the vicinity of a full throttle condition.
A method for controlling knocking in a watercraft engine, comprising:
- detecting a knocking in the engine;
- changing a knocking learning value toward a low octane number ignition timing map when knocking is detected;
- when knocking is not detected, changing the knocking learning value toward a high octane number ignition timing map if an engine speed is not in the vicinity of a full throttle condition;
- when knocking is not detected, maintaining the knocking learning value towards the low octane number ignition timing map if the engine speed is in the vicinity of the full throttle condition;
- and
- retarding or advancing ignition timing based upon the knocking learning value.
Dependencies are inferred from the claim text.