Abstract

In 1980's to 1990's the marine propulsion diesel engines have been developed into lower speed and longer stroke for the energy saving(small S.F.O.C.). As these new trends the convetional mechnical-hydraulic governors were not adapted to the new requirements and the digital governors have been adopted in the marine use. The digital governors usually use the control algorithms such as the PID control, optimal control, adaptive control and etc. While the engine has delay time and parameter variations these control algorithms have difficulty in considering the stability and the robustness for the model uncertainty. In this study, the $H_{\infty}$ controller design method are applied to the speed control of the low speed marine diesel engine. By comparison the $H_{\infty}$ control results with the PID control results, the validity of the $H_{\infty}$ controller under the delay time and parameter variations is confirmed.

Keywords

• $H_{\infty}$ controller;
• Model uncertainty;
• Sensitivity fun-ction;
• Complementary sensitivity function;
• Multiplica-tive perturbation;
• Frequency weighting

• $H_{\infty}$ 제어기;
• 모델불확실성;
• 감도함수;
• 상보감도함수;
• 곱하기섭동;
• 주파수하중;