Fishing Reel Braking Force Control via Speed-Based Feedforward
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Solution Overview
Problem
Existing braking force control devices for fishing reels face challenges in accurately controlling backlash and improving flying distance due to noise sensitivity, high calculation loads, and limitations in reducing spool inertia, particularly when monitoring angular acceleration.
Innovation Solution
A braking force control device that adjusts braking force based on elapsed time and rotational speed detection, using a conductive member, magnetic force generation, and magneto-rheological fluid, without monitoring acceleration, to generate a braking force proportional to the spool's angular speed, thereby optimizing braking torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If angular acceleration is monitored using incremental encoder with photosensors, then angular acceleration can be obtained, but the system becomes highly sensitive to noise and control accuracy deteriorates
Solution Approach 1:
The patent extracts the acceleration monitoring function from the system entirely. Instead of detecting angular acceleration directly through photosensors and encoders, the system uses only rotational speed detection. The braking control is achieved by feedforward control based on predetermined brake set values corresponding to detected rotational speeds, completely eliminating the need for acceleration monitoring and thus removing noise sensitivity associated with acceleration detection.
Solution Approach 2:
The patent replaces the mechanical/optical detection system (photosensors and encoders for acceleration measurement) with a simplified rotational speed detection system. By substituting acceleration-based feedback control with speed-based feedforward control using predetermined brake set values, the system achieves backlash prevention without the noise sensitivity inherent in acceleration monitoring systems.
2Measurement precision
If angular acceleration is monitored by detecting counter electromotive force and differentiating angular speed, then angular acceleration can be obtained, but a magnet must be provided on the spool which increases spool inertia
Solution Approach 1:
The patent removes the acceleration detection mechanism entirely from the system. By using only rotational speed detection with predetermined brake set values, the system eliminates the need for magnets on the spool, thereby reducing spool inertia while still achieving effective backlash prevention through speed-based feedforward control.
3Measurement precision
If feedback loop for constantly monitoring angular acceleration is implemented, then control accuracy can be maintained, but oscillation influence increases and calculation load becomes high
Solution Approach 1:
The patent implements preliminary action by pre-determining brake set values for various rotational speeds before operation. During casting, the system simply detects the current rotational speed and applies the corresponding predetermined brake set value, eliminating the need for real-time acceleration calculation and feedback loop processing. This feedforward approach reduces calculation load and oscillation susceptibility while maintaining control accuracy.
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 enables effective backlash prevention and flying distance improvement without the need for acceleration monitoring, reducing noise sensitivity and calculation loads, and allowing for optimal braking force settings based on specific casting conditions.
Implementation Method 1
a magnet is provided on the spool and a coil is provided on the reel body, thereby obtaining the angular acceleration by detecting a counter electromotive force proportional to rotation of the spool
Implementation Method 2
a braking unit that generates a braking force to the spool
Implementation Method 3
using a conductive member, magnetic force generation, and magneto-rheological fluid
Data Source
AI summary
A braking force control device according to one embodiment of the present disclosure is a braking force control device provided with a spool pivotally supported by a reel body, the spool on which a fishing line may be wound, a rotational speed detection unit that detects a rotational speed of the spool, a braking unit that generates a braking force to the spool, and a braking force control unit that controls the braking force of the braking unit, in which the braking force control unit adjusts the braking force according to elapsed time from when casting starts or detection information of the rotational speed detection unit.