Abstract
When a little fluctuation of the revolutions on a marine propulsion diesel engine might be accepted, its fuel consumption rate would be reduced without any modifications to the engine. In the process of developing a new type engine governor, it was found that an insensitive diesel engine revolution control can get lower fuel consumption than a sensitive one. However, an insensitive governor will course some trouble such as "Over speed trip" of the engine during operation in rough seas. The fluctuation of revolution on marine propulsion engines are caused with hull movements, especially pitching motions, which have strong effect. Considering those facts, the idea that to estimate the pitching motion in near future and apply it to the control of an engine's revolutions came to our mind.This paper is introducing a new algorism for the engine governor that is how to get a lower fuel consumption rate with preventing over-speed without any modifications to the engine itself. These effects of the new algorism were confirmed with using the training ship "SHIOJI MARU" in Tokyo University of Marine Science and Technology.Newly developed this "DDVC Governor" has the function of on-line change for any parameters with using digital controller. And it proved that the confirmation of effects of new algorithm for engine governor was quite easy.
