Abstract
The seagoing vessel meets with Various sea conditions, in which her fuel comsumption is influenced by the way how to choose her speed, even if her average speed equal.Up to now, the main engine has been controlled to keep constant revolutin in calm sea. But, in rough sea, the engine revolution has been decreased to keep constant output.On the other hand, in this new control method, the engine governor is controlled antomatically to keep the ratio of dy/dx (dy: a little variation of fuel consumption, dx: a little variation of ship's speed) in any sea condition so as to arrive on time at the ship's destination with minimum fuel consumption. Both saving energy and rationality can be gained by this method.
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