Ship Maneuvering Shift Actuator Intermittent Control
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Solution Overview
Problem
Existing ship maneuvering systems experience discomforting sound, shift shock, and shift noise during intermittent control, especially when multiple propulsion devices engage simultaneously, leading to increased wear and reduced steering performance.
Innovation Solution
A ship maneuvering system with multiple propulsion devices, a shift actuator, and a controller that intermittently switches the shift state of one propulsion device at a time during low-speed navigation, reducing simultaneous engagement and minimizing shift shocks and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all propulsion devices are intermittently controlled at the same time, then the ship can achieve efficient low-speed navigation, but the plurality of propulsion devices will engage at the same time causing uncomfortable sound and increased wear
Solution Approach 1:
The patent divides the intermittent control operation into separate segments for each propulsion device. Instead of controlling all propulsion devices simultaneously, the controller executes intermittent control for one propulsion device at a time in sequence. This segmentation of the control operation ensures that only one propulsion device engages at any given moment, thereby eliminating the simultaneous engagement sound while maintaining the overall low-speed navigation efficiency.
2Power
If the shift mechanism operates during intermittent control, then the driving force can be transmitted to the propeller, but shift shock and shift noise occur
Solution Approach 1:
The patent applies preliminary action by controlling the shift mechanism to be in the shift-out state (disengaged) before initiating intermittent control operation. The controller ensures that the shift mechanism is prepared in advance to avoid engagement during the intermittent control cycles. By pre-positioning the shift mechanism in a neutral state before low-speed navigation begins, the system can transmit driving force when needed while avoiding shift shock and noise during the intermittent control periods.
Data Source
AI summary
A ship maneuvering system includes first and second propulsion devices, a shift actuator, and a controller. The shift actuator switches a shift state of each of the propulsion devices. The controller causes the shift actuator of one of the first and second propulsion devices to execute intermittent control during low-speed navigation of the ship. The intermittent control intermittently switches the shift state to a shift-in state and a shift-out state.