Watercraft Thrust Steering Calibration Control Unit
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Solution Overview
Problem
Existing control systems for watercraft fail to provide precise steering during docking maneuvers, as the movements of a manually operable steering control device do not always correspond to the actual direction of the watercraft's movement, due to variations in the center of rotation and efficiency differences between forward and reverse engine operations.
Innovation Solution
A calibration method and arrangement where the control unit receives activation and termination commands, detects movements of the operating device, stores corresponding thrust and steering values, and repeats this process until termination, allowing for accurate direction control without complex calculations about the center of rotation, using these stored values for subsequent operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manually operable steering control device is used to control thrust and steering during docking, then the driver can operate the watercraft, but the movements of the control device do not correspond precisely to the actual direction of movement due to variations in center of rotation and engine efficiency differences
Solution Approach 1:
The system performs preliminary calibration before normal operation by detecting the actual movement direction of the watercraft during a calibration maneuver and storing this information. This preliminary action allows the control system to compensate for center of rotation variations and engine efficiency differences during subsequent docking operations, ensuring precise direction control without requiring complex real-time calculations.
2Measurement precision
If complex calculations about the center of rotation are performed to achieve precise steering control, then the direction control precision improves, but the device complexity and computational requirements increase
Solution Approach 1:
Instead of performing complex real-time calculations about the center of rotation, the system creates a simplified copy or representation of the calibration data during a preliminary calibration phase. The control unit stores calibration values that represent the relationship between control device movements and actual watercraft movement. During normal operation, the system uses these pre-stored calibration values rather than recalculating center of rotation parameters, thereby achieving precise control with minimal computational complexity.
3Measurement precision
If the efficiency differences between forward and reverse engine operations are accounted for through complex control algorithms, then the steering precision improves, but the device complexity increases
Solution Approach 1:
The system accounts for efficiency differences between forward and reverse engine operations by storing separate calibration values for different operating conditions during the calibration phase. The control unit automatically selects and applies the appropriate calibration values based on the current engine operation mode (forward or reverse), thereby compensating for efficiency variations without requiring complex real-time algorithms. This parameter-based approach simplifies the control system while maintaining precision.
Data Source
AI summary
In a method for calibrating a system for controlling thrust and steering of a drive arrangement in a watercraft, the system includes an operating device adapted for indicating a requested direction of travel of the watercraft, the operating device being connected to a control unit for providing corresponding thrust and steering commands to the drive arrangement. The method includes receiving an activation command in the control unit, for beginning the calibration, detecting any movements of the operating device, storing values corresponding to the movements in the control unit together with corresponding thrust and steering values, and repeating the detecting step and the storing step until a termination command is received in the control unit, thereby using the stored values in subsequent operation of the operating device for indicating the direction of travel of the watercraft. An arrangement for calibrating a system for controlling thrust and steering of a drive arrangement in a watercraft is also provided.