| 摘要 |
In a marine propulsion control system for controlling a set of propulsion units carried by a hull of a vessel, cavitation typically occurs on the propulsion unit with reverse gear engaged, and in a triple propulsion unit installation the normally idle center propulsion unit can be used to increase the reverse thrust and thereby limit the RPM of propulsion units in reverse, so that the cavitation effect is limited, and simultaneously allow for higher forward thrust on the third propulsion unit, thus increasing the total thrust for the vessel. |
| 主权项 |
1. A marine propulsion control system for controlling a set of propulsion units carried by a hull of a vessel, wherein the set of propulsion units comprise a first propulsion unit, a second propulsion unit and a third propulsion unit, wherein the second propulsion unit is provided as a center propulsion unit between the first and third propulsion unit, the marine propulsion control system comprising a control unit configured to:
receive an input command from a steering control instrument for operating the vessel; determine a desired delivered thrust, gear selection and steering angle for the first, second and third propulsion unit respectively, based on the input command, and provide a set of control commands for controlling the desired delivered thrust, gear selection and steering angle for the first, second and third propulsion unit, wherein if the input command indicates a sway command the first propulsion unit is set to have a forward gear selection and the third propulsion unit is set to have a reverse gear selection, each with a selected thrust level, and if the thrust level for at least one of the first and the third propulsion unit exceeds a predetermined thrust level the second propulsion unit is set to have a reverse gear selection with a thrust level depending on the selected thrust level of at least one of the first and the third propulsion unit. |
