디지털 조속기에 의한 선박용 디젤기관의 속도제어에 관한 연구

Abstract

A Study on the Speed Control of the Diesel

Engine with a Digital Governor

The marine propulsion diesel engine with mechanical-hydraulic governor has been widely used to control the engine speed.

But these days, marine propulsion disesel engine tends to become slower in speed and longer in stroke for higher engine efficiency, so it leads to difficulty for the mechanical-hydraulic governor to regulate the speed of high power engine with long stroke and low speed, because of the jiggling caused by rough fluctuation of rotating torque and the hunting by long dead time occurred in fuel combustion process.

To cope with these difficulties, engine manufacturers highly reco- mmend to adopt digital governor for the longer stroke and slower speed engine.

Most of the digital governors adopt the feedback control method in which the only engine rpm-signal is used, but it does not work effectively when the load variation occurs.

In this paper, the author considers the perturbation of engine parameters as the modeling uncetrainties and designs not only the robust speed controller but fuzzy speed controller for the engine.

Through the computer simulation, the performances of both controlle- rs are compared and reviewed.