Abstract
Recently, providing a controllable pitch propeller (CPP) has increased for convenience of maneuvering a ship or capability of using the shaft generator, and the conventional control algorithms of these CPP system are comparatively simple. However, CPP system has essentially the capability of controlling two freedoms because there are two input parameters of a propeller pitch angle (P) and a regulator handle position (R) in the system. One freedom must be used for controlling the ship speed which is the most important controlled value for vehicles. Another freedom should be utilized positively to improve or optimize some useful performances such as fuel consumption ratio (be), NOx emission and so on. These utilization is accomplished by controlling P and R simultaneously which is called the consolidated control. In the study, “be” or “be” plus NOx was adopted as the performance index of the utilization. There are two types of the consolidated control, “On-line type” and “Off-line type”. In this study, On-line type consolidated control was focused and investigated by simulation. Results showed the usefulness of this consolidated control.
