Ship Propulsion Control Mapping for Multi-Power Source Mode Switching
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Solution Overview
Problem
In ships with multiple power sources of different maximum outputs, the operability of the operation acceptor is compromised when switching between forward, neutral, and backward movements, as not all operation amounts of the acceptor are effectively reflected in the motor rpm, particularly in navigation with lower output motors.
Innovation Solution
A ship control method that adjusts the output value related to propulsive force and changes the correspondence between operation amounts and output values based on propulsion modes, including synchronization of engine and motor rpm before clutch states change, and controlling torque during transitions between propulsion modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single operation acceptor is used to control multiple power sources with different maximum outputs, then the control structure is simplified, but the operability of the operation acceptor deteriorates because not all operation amounts are effectively reflected in the motor rpm
Solution Approach 1:
The patent applies dynamics by making the correspondence relation between operation amount and output value changeable according to propulsion modes. The control system dynamically adjusts how the operation acceptor's input is mapped to power source outputs based on which power source is currently active, ensuring optimal responsiveness across different operating conditions while maintaining a single operation acceptor interface.
2Device complexity
If the correspondence relation between operation amount and output value is fixed, then the control system is simpler, but the adaptability to different propulsion modes deteriorates
Solution Approach 1:
The patent implements parameter changes by modifying the correspondence relation between operation amount and output value based on the selected propulsion mode. When switching between engine-driven and motor-driven modes, the system adjusts the mapping parameters to match the characteristics of the active power source, thereby achieving adaptability without requiring complex hardware changes.
3Speed
If clutch switching is performed without synchronization, then the switching speed is faster, but the reliability of power transmission deteriorates due to potential damage from speed differences
Solution Approach 1:
The patent applies preliminary action by synchronizing the rotation speeds of the engine and motor before clutch switching occurs. The control system performs speed synchronization in advance of the clutch engagement, ensuring that both power sources are at compatible speeds before the mechanical connection is made, thereby preventing damage while enabling reliable mode transitions.
Data Source
AI summary
The control method of a ship is used for the ship. The ship is equipped with a plurality of power sources including a first power source and a second power source, and has a plurality of propulsion modes in which a power source used for propulsion of a hull is different between the plurality of power sources. The control method of the ship includes adjusting an output value related to a propulsive force of a hull to a value corresponding to an operation amount of an operation acceptor and changing a correspondence relation between the operation amount and the output value in accordance with a propulsion mode.