| 摘要 |
PURPOSE:To control a variable pitch propeller to obtain an optimum load for a main engine, by counting the controlling cycle number of a blade angle control signal for controlling the drive section of the variable pitch propeller at predetermined time intervals, and by automatically setting the width of the dead zone of a dead zone functioning section and an amplified gain. CONSTITUTION:A rotational speed signal from a main engine is delivered to an optimum load computing unit 23, and a micro-computer computes an optimum load signal, utilizing optimum load curves with respect to the rotational speed of the main engine. A load signal and the optimum load signal are processed by a subtracting section 24 which issues a load deviation signal DELTAPS' that is therefore delivered to a dead zone functioning section 25 where the signal DELTAPS' is processed so that the width (a) or (b) of a dead zone is subtracted therefrom, and the signal DELTAPS' is then multiplied by an amplified gain Ca or Cb, thereby it is delivered as a blade angle deviation signal DELTAtheta' to a PID computing section 26. The PID computing section 26 delivers a blade angle control signal for controlling the pitch of the variable pitch propeller.
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