Steer-by-Wire Rudder Control Under Communication Failure
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Solution Overview
Problem
In steer-by-wire rudder systems, cooperative control between multiple motor units can fail, leading to potential vibration or locking of the rudder mechanism when communication is lost, which disrupts the continuous operation of the rudder mechanism.
Innovation Solution
Implementing a control system where one control unit continues to operate its respective motor unit while the other control unit stops its operation if cooperative control is not possible, ensuring that at least one motor unit maintains control to prevent vibration and locking of the rudder mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cooperative control is performed between multiple control units, then the rudder system can maintain continuous operation, but communication failure may cause vibration or locking of the rudder mechanism
Solution Approach 1:
Each control unit monitors communication status with other control units and adjusts its operation accordingly. When communication failure is detected, the control unit switches from cooperative control mode to independent control mode, using feedback signals to determine the appropriate operational state and prevent vibration or locking of the rudder mechanism
Solution Approach 2:
The control system dynamically adjusts its behavior based on communication status. Control units can switch between cooperative control and independent control modes in real-time, allowing the system to adapt to changing communication conditions and maintain reliable operation while preventing harmful effects like vibration or locking
2Measurement precision
If multiple control units perform cooperative control, then the rudder mechanism can be controlled precisely, but system complexity increases
Solution Approach 1:
The control system is divided into independent control units, each responsible for specific control functions. This segmentation allows precise control through coordinated action while managing complexity by dividing the overall control task into manageable, independent modules that can operate autonomously when needed
3Loss of information
If cooperative control fails, then communication issues arise, but both control units cannot stop operation simultaneously
Solution Approach 1:
Each control unit independently monitors its own operational status and communication state, making decisions about whether to continue independent control or stop based on local conditions. This self-service approach ensures that at least one control unit maintains operation to prevent rudder mechanism locking while managing communication failures without requiring coordination between all units
Data Source
AI summary
A steer-by-wire rudder system includes a first system having a first motor unit that drives a rudder mechanism and a first control unit that controls the first motor unit, and a second system having a second motor unit that drives the rudder mechanism and a second control unit that controls the second motor unit. The first control unit and the second control unit perform cooperative control for controlling the first motor unit and the second control unit to cooperate with each other. When the cooperative control is not performed, one of the control of the first motor unit by the first control unit and the control of the second motor unit by the second control unit continues, and the other thereof stops.