TS-69
Main Engine Revolution Control for Ship with Direct Drive Volume Control System
Masanori ITO*, Noriki HIROSE**, Etsuro SHIMIZU***, Hiroshi SATO**** and Toshihiko NAKATANI*****
ABSTRACT
This paper describes a revolution control system of main engines of ships in rough seas. The control system is designed and equipped for the main engine system instead of an usual governor. To have desired characteristics, the control system is constructed with the actuator which has a higher responsibility. This actuator is named Direct Drive Volume Control (DDVC) Hydraulic System. In this research, the authors confirmed the performance with computer simulation at first, and then equipped the system on the real ship. This paper shows the results of some simulation to and the control system. The model of a main engine is obtained from the experimental data of the training ship of Tokyo University of Mercantile Marine, "Shioji-maru", and the system is equipped on the ship.
Key Word : Engine Control, Governor, Propeller Racing, Rough Sea
1. INTRODUCTION
When a ship goes in rough seas, it is usually put on a violent pitching motion with wave, and it causes periodical changes of load for propulsion engine. In these days, a ship uses diesel engine as a propulsion engine and conventional PID-type governors is always applied to control the engine revolution. Although in such a violent disturbance, especially when the propeller rises up over the surface of the sea, it cannot control the revolution and the main engine may suffer from over-driving or other fatal damage.
Previous efforts [1] to use adaptive control instead of a conventional governor for this kind of problem required estimates of both the dynamics of the engine plant and the disturbances.
Because the dynamics of the main engine can be measured beforehand, a control method using adaptive disturbance estimation was developed.
In this study; we applied new actuator to control the engine revolution which is named Direct Drive Volume Control (DDVC) Hydraulic System and has high responsibility. As the first step of the study, we estimated the performance with simulation and then equipped the system to the real ship named Shioji-Maru to confirm it, which is the training ship of Tokyo University of Mercantile Marine. In this paper, we would like to show the results of simulation and on board test in Shioji-maru.
2. MAIN ENGINE REVOLUTION CONTROL SYSTEM OF SHIP
2.1 Outline of Control System
The outline of Main Engine Revolution Control is as follows;
1] The Revolution of Main Engine is changed with changing the output of engine or propeller load.
2] The output of main engine is changed with the fuel injection rate of each cylinder with changing working duration of fuel pump and fuel injection valve.
*Department of Electronic and Mechanical Engineering,
<`>Tokyo University of Mercantile Marine
2-1-6, Etchujima, Koto-ku, Tokyo, 135-8533, Japan
FAX: +81-3-5245-7336 E-mail: itom@ipo.tosho-u.ac.jp
**Department of Marine Mechanical Engineering,
Tokyo University of Mercantile Marine
***Department of Electronic and Mechanical Engineering,
Tokyo University of Mercantile Marine
****Daiichi Electric Co. Ltd.
*****Department of National Science,
Toyama National College of Maritime Technology
