Dynamic Braking Control for Dual-Bearing Reel Spools
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Solution Overview
Problem
Existing braking apparatuses for dual-bearing reels struggle to precisely control spool braking, leading to excessive or deficient braking during casting, especially when dealing with varying fishing line parameters and changing environmental conditions such as wind, resulting in reduced flight distance and increased backlash.
Innovation Solution
A braking apparatus with an electrically controllable spool braking device, rotational speed detection, and a control system that adjusts braking forces based on estimated tension values and rotational speed changes, using a first braking force for a predetermined period followed by a second braking force calculated from the rotational speed change, and repeating this process to adapt to changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed braking force is applied to the spool during casting, then the spool can be braked effectively to prevent backlash, but the braking becomes excessive or deficient when fishing line parameters or environmental conditions change
Solution Approach 1:
The braking force is made dynamic rather than fixed. The control device adjusts the braking force in real-time based on detected rotational speed and calculated tension values. The system transitions from a static braking approach to a dynamic one where braking force varies according to actual casting conditions, resolving the contradiction between reliable backlash prevention and adaptability to changing conditions.
Solution Approach 2:
The system implements feedback control by detecting rotational speed, calculating tension values, and using this information to adjust braking force. The control device continuously monitors casting conditions and modifies braking force accordingly, creating a closed-loop control system that adapts to varying fishing line parameters and environmental conditions while maintaining effective backlash prevention.
2Reliability
If a strong braking force is applied to prevent backlash, then backlash is suppressed, but the flight distance of the lure is reduced
Solution Approach 1:
The system applies braking force selectively and proportionally rather than continuously at maximum intensity. By detecting actual tension values and rotational speed, the control device applies only the necessary braking force to prevent backlash, avoiding excessive braking that would reduce flight distance. The braking is calibrated to match actual casting conditions.
Solution Approach 2:
The braking force parameter is dynamically adjusted based on detected rotational speed and calculated tension values. Rather than maintaining a constant strong braking force, the system varies the braking parameter according to actual casting conditions, applying stronger braking only when necessary to prevent backlash and reducing braking when conditions allow for longer flight distance.
3Reliability
If braking force is increased after tension reduction is detected, then backlash prevention is enhanced, but excessive braking occurs during the latter half of casting
Solution Approach 1:
The braking force is dynamically adjusted throughout the casting process based on real-time detection of rotational speed and calculation of tension values. Rather than applying increased braking force after tension reduction detection, the system continuously adapts braking force to match actual casting conditions, preventing both excessive and deficient braking during different phases of the cast.
Solution Approach 2:
The control device uses continuous feedback from rotational speed detection and tension calculation to adjust braking force throughout the casting process. This feedback mechanism prevents the premature or excessive braking that would occur with fixed timing-based control, ensuring braking force is optimized for each phase of casting to maintain both backlash prevention and casting efficiency.
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
This solution improves the precision of spool braking, reducing backlash and ensuring optimal braking force, thereby extending the flight distance and maintaining consistent performance across different fishing line types and environmental conditions.
Implementation Method 1
a rotational speed detection device (detector) for detecting a rotational speed of the spool
Implementation Method 2
a spool braking device (brake) for braking a spool
Data Source
AI summary
A braking device for a spool that is rotatably supported by a reel body includes a spool braking device, a rotational speed detector, and an electronic controller. The spool braking device is configured to brake a spool in an electrically controllable manner. The rotational speed detector is configured to detect a rotational speed of the spool. The electronic controller is configured to control the spool braking device to brake the spool with a first braking force for a first predetermined period of time, and control the spool braking device to brake the spool with a second braking force that is based on a change in the rotational speed after the first predetermined period of time has elapsed.