Ship Propulsion Mode Control via Rotational Speed Fault Detection
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Solution Overview
Problem
Existing ship control systems relying on actuators for switching between propulsion modes are prone to reliability issues due to potential actuator failures, leading to deviations in operation mode management.
Innovation Solution
A method and system that compares rotation speeds of multiple power sources and a propulsive force generator to detect abnormalities in actuators and power transmitters, ensuring reliable operation mode management by determining actuator and power transmitter abnormalities based on these comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If actuator-driven power transmitter is used for mode switching, then operation mode switching is achieved, but reliability of operation mode management deteriorates due to potential actuator failures
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring the rotation speeds of power sources and propulsive force generators, comparing them with commanded values, and detecting deviations that indicate actuator or power transmitter abnormalities. This feedback loop enables the system to identify when the actual operation mode diverges from the commanded mode, thereby improving reliability without compromising ease of operation.
Solution Approach 2:
The system performs self-diagnosis by autonomously detecting abnormalities in actuators and power transmitters through rotation speed comparisons. The control device automatically identifies mismatches between commanded and actual operation modes without requiring external intervention, enabling the system to self-monitor and self-report faults, thus improving reliability while maintaining ease of operation.
2Device complexity
If actuator position-based mode management is implemented, then mode switching control is simplified, but detection of actuator failures becomes difficult
Solution Approach 1:
The patent introduces feedback by monitoring rotation speeds of power sources and propulsive force generators and comparing them with commanded values. This feedback mechanism enables detection of actuator failures by identifying deviations between expected and actual rotation speeds, making failure detection straightforward without increasing system complexity.
Solution Approach 2:
The patent replaces reliance on mechanical actuator position sensing with a rotational speed-based detection system. Instead of monitoring actuator position directly, the system infers operation mode and detects abnormalities by measuring rotation speeds of power sources and propulsive force generators, which are easier to measure and provide more reliable failure detection.
Data Source
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AI summary
[Problem]A method for controlling a ship, a ship control program, a ship control system, and a ship that can improve reliability of a management state of an operation mode are provided. [Solution]The method for controlling a ship is employed in a ship that has a plurality of power sources including a first power source (engine 31) and a second power source (motor 32) and transmits power supplied from at least one of the plurality of power sources to the propulsive force generator 4 through the power transmitter 33 for propulsion of a hull. The control method includes determining at least two of the first power source, the second power source, and the propulsive force generator 4 as comparison targets and comparing the rotational speed between the comparison targets, and determining an abnormality of at least one of an actuator 34 that drives a power transmitter 33 and the power transmitter 33 based on the comparison result on the rotational speed.