| 摘要 |
The object of the invention is a method and an apparatus for controlling a ship propulsion drive. The propulsion drive comprises a motor (16) fitted to the ship's propeller shaft (18) and the motor control device (20, 24) controlling the motor. According to the invention, a group of propulsion drive characteristic curves are defined as a function of at least one variable, the said characteristic curves determining an operating point and defining the characteristic curve range in which the propeller (14) operates in a predefined cavitation- free range, and the propulsion drive characteristic curves are saved to a memory. During operation, the current values for the propulsion drive variable in question are constantly determined, the current values of the variables are compared (38, 40) with the values of the characteristic curves' operating points and, based on the comparison, the propulsion drive is controlled so that the propeller (14) operates in a cavitation-free range. |
