Outboard Motor Collision Detection Using Back-EMF Attitude Signals
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Solution Overview
Problem
Existing methods for detecting collisions with an outboard motor do not effectively utilize the counter electromotive force generated by attitude changes and require additional equipment, limiting their effectiveness in determining collisions without significant tilt changes.
Innovation Solution
A control apparatus and method that utilizes the counter electromotive force generated by attitude changes of an outboard motor to detect collisions, without the need for dedicated detectors, by monitoring changes in trim and steering angles and hull speed, and implementing collision determination based on predetermined thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dedicated detector or other equipment is installed to detect collision, then collision detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The outboard motor uses its own actuator system to detect collision by monitoring counter electromotive force, eliminating the need for separate dedicated detectors. The existing motor components serve dual purposes: propulsion and collision detection
Solution Approach 2:
The patent replaces mechanical collision detection equipment with an electrical sensing method by monitoring counter electromotive force in the actuator, substituting physical detectors with electrical signal analysis
2Reliability
If the outboard motor responds by stopping drive when collision is detected during high-speed backward movement, then safety is improved, but productivity is reduced
Solution Approach 1:
The control unit changes the response parameter based on the backward speed condition: stopping the motor when backward speed exceeds the threshold, and issuing only a warning when it is below the threshold, thereby adapting the safety response to operational conditions
3Productivity
If the outboard motor issues a warning instead of stopping when collision is detected during low-speed movement, then productivity is maintained, but safety response is reduced
Solution Approach 1:
The control unit adjusts the safety response parameter based on the backward speed parameter, issuing a warning rather than stopping the motor when the backward speed is below the threshold, balancing safety and operational continuity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances collision detection accuracy and safety by utilizing multiple detection values from counter electromotive force, allowing for quick response to high-speed collisions and issuing warnings or stopping the outboard motor drive as needed, even during low-speed movements.
Implementation Method 1
a detection unit (47, 49) that detects a counter electromotive force generated by an attitude change of the outboard motor (4, 5) due to an external force applied on the outboard motor (4, 5)
Data Source
AI summary
A control apparatus for an outboard motor (4, 5) mounted on a hull (2), comprises a control unit (30, 40) that controls an attitude of the outboard motor (4, 5) with respect to the hull (2), and a detection unit (47, 49) that detects a counter electromotive force generated by an attitude change of the outboard motor (4, 5) due to an external force applied on the outboard motor (4, 5). The control unit (30, 40) determines that an object has collided with the outboard motor (4, 5) when the counter electromotive force that exceeds a predetermined threshold is detected.