Abstract
According to experiment navigations of the training ship Fukae-Maru, 360 G.T. using C-P propeller, it is generally obtained the fact that the amount of fuel oil consumption can be decreased according as revolution of main engine becomes low and propeller pitch angle high on keeping ship speed constant. While above driving mode is applied to control the engine system, it is apt to force the Diesel engine to drive under torque rich condition, which may give the engine unexpected failure. To avoid troubles on driving Diesel engine applying experimental economical driving mode, authors propose an idea of engine control system, named Proportional Torque Control (PTC), which is applied to a combined system of engine and C-P propeller, that is, on any condition of driving the Diesel engine, the amount of shaft horse revolution of engine is kept less than that indicated by analytical power curve which is proportional to square velocity of engine. It is also discussed on practical PTC system about economic problem and control stability.
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