선박용 디젤 주기관의 강인한 속도제어기 설계

Design of Robust Speed Controller for Marine Diesel Engine

Nowdays marine diesel engines are becoming slow speed, long stroke and using fewer cylinders for saving fuel oil and increasing output per cylinder to get improved propulsion efficiency. Consequently the variation of rotational torque became larger because of the longer delay-time in fuel oil injection process. Focusing on the speed control of a marine diesel engine, the hydraulic governors are still used where the speed variation is allowed to some degree. When the engine load varies abruptly in rough sea, the conventional hydraulic governors are not enough for good control. For solving this problem, we present a fuzzy-PID controller which unifies both fuzzy control technique and PID control technique. Finally the effectiveness of the proposed controller is verified through computer simulation of a long stroke low speed marine diesel engine.