Vessel Speed Mode Transition Control During Acceleration Changes
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Solution Overview
Problem
Vessel speed control systems experience temporary speed fluctuations when transitioning from normal to speed control mode due to rapid changes in propulsion speed, leading to inefficient mode transitions.
Innovation Solution
A vessel speed control system with a controller that prevents transition to the speed control mode during acceleration/deceleration periods and immediately after, using sensors to monitor engine and propulsion speed changes, and allowing transitions only when conditions meet specific thresholds to minimize disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the transition operation is allowed during rapid propulsion speed changes, then the mode transition responsiveness is improved, but the speed control stability deteriorates due to temporary speed fluctuations
Solution Approach 1:
The controller performs preliminary detection of the propulsion speed change rate before allowing mode transition. When the change rate exceeds a predetermined threshold, the controller preemptively prevents the mode transition, thereby avoiding speed fluctuations that would occur during unstable propulsion conditions
2Stability of the object's composition
If the transition operation is restricted during acceleration/deceleration periods, then the speed control stability is improved, but the mode transition responsiveness deteriorates
Solution Approach 1:
The controller dynamically adjusts the transition permission based on real-time propulsion speed change rate detection. When the change rate is within acceptable thresholds, mode transition is permitted; when it exceeds thresholds, transition is restricted. This dynamic adaptation optimizes both stability during rapid changes and responsiveness during stable conditions
Solution Approach 2:
The controller monitors the propulsion speed change rate as a dynamic parameter and uses this parameter to control transition permission. By changing the operational state based on this parameter threshold, the system achieves optimal balance between stability and responsiveness
Data Source
AI summary
A vessel speed control system includes a lever operator on which an operation is performed to increase or decrease a propulsion speed of the vessel, a transition operator on which a transition operation is performed to transition a normal operation mode to a speed control mode, and a controller configured or programmed to perform a control to prevent transition to the speed control mode even when the transition operation is performed on the transition operator during a restriction period of time including at least an acceleration/deceleration period of time during which a rotation speed of an engine or the propulsion speed of the vessel is changed by the lever operator in the normal operation mode.