Constant ship speed control method

Details Constant ship speed control method Constant ship speed control method

1981-09-17

1984-03-13

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Method of operation

416 27, B63H 310

Patent

active

044364822

ABSTRACT:
A method of controlling the speed of a ship equipped with a controllable pitch propeller at a predetermined value. A desired horsepower corresponding to a desired ship speed is obtained in accordance with the actual horsepower, the detected ship speed value and the preset ship speed value, and the rpm of the main engine is controlled in accordance with the desired rpm obtained in accordance with an engine loading function generator for minimum fuel consumption obtained in accordance with predetermined engine loading function generator for optimum propeller efficiency and a designed load characteristic function and the desired horsepower. A desired fuel rack position is obtained in accordance with the desired rpm and the desired horsepower and the desired fuel rack position is compared with the actual fuel rack position so as to control the blade angle of the propeller. By thus controlling the main engine rpm and the propeller blade angle, it is possible to maintain the speed of the ship at the value preset in accordance with the running schedule for all the changes in the running conditions and it is also possible to ensure the minimum fuel consumption for the preset ship speed.

REFERENCES:
patent: 2588371 (1952-03-01), Englesson
patent: 2958381 (1960-11-01), Stevens et al.
patent: 3088523 (1963-05-01), Smalley et al.
patent: 3110348 (1963-11-01), Greiner
patent: 3588272 (1971-06-01), Lindahl et al.
patent: 3589830 (1971-06-01), Mogren et al.
patent: 3826590 (1974-07-01), Kobelt
patent: 4142829 (1979-03-01), Inoue et al.
patent: 4239454 (1980-12-01), Olson

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