| 摘要 |
A main engine is operated at an efficient rotational frequency to match fluctuations in propeller inflow velocity, and fuel efficiency is increased. The divergence between a rotational frequency command and measured variations in rotational frequency (NE) of a main axle (13) or the main engine (12) is inputted into a proportional-integral-derivative (PID) computation unit (16), and feedback control is performed on the quantity of fuel supplied from a fuel injection device (15) to the main engine (12). The propeller inflow velocity of a propeller (14) is detected and inputted into a computation unit (17). The rotational frequency command is adjusted such that the control point moves along an efficiency curve in response to fluctuations in propeller inflow velocity. |
