Bicycle Trainer Magnetic Brake Control for Power Measurement
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Solution Overview
Problem
Conventional bicycle trainers face issues with level adjustment, portability, compatibility with different wheel sizes, and the complexity and reliability of power measurement systems, as well as providing a consistent and realistic riding experience due to high friction and torque requirements.
Innovation Solution
A bicycle trainer system that includes a vertically adjustable rear axle, a reversible spacer for mounting different wheel sizes, and a magnetic brake assembly controlled via a computing device using an API to simulate various riding conditions and display real-time data, allowing for power measurement and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional trainers use rollers with high friction to provide resistance, then the trainer can measure power output, but the friction causes wear and tear on tire, hub, bearings and other components
Solution Approach 1:
The patent replaces the mechanical roller contact system with an electromagnetic braking system. Instead of using physical rollers that contact the bicycle tire and create friction, the system uses electromagnetic forces to provide resistance. This substitution eliminates the mechanical contact that causes wear and tear on tires, hubs, and bearings while still enabling accurate power measurement through electromagnetic sensors.
2Adaptability or versatility
If conventional trainers are designed for one size wheel and one size axle, then the structure is simple, but the trainer cannot accommodate different bicycle types (26 inch, 29 inch, 700c wheels)
Solution Approach 1:
The patent implements adjustable components that can be dynamically reconfigured to accommodate different wheel sizes. The axle assembly includes adjustable spacing mechanisms that allow the trainer to adapt to various bicycle types (26 inch, 29 inch, 700c wheels). The support structure includes adjustable legs and mounting positions that can be repositioned to match different wheel diameters, enabling a single trainer to serve multiple bicycle types without requiring complex multiple-configurable designs.
3Force
If conventional trainers require the rider to overcome large torque to maintain movement, then the trainer provides resistance, but the rider cannot coast and the trainer slows down the rear wheel quickly
Solution Approach 1:
The patent uses an electromagnetic braking system where the braking force can be dynamically adjusted based on riding conditions. The system can provide high resistance when needed for training and can be reduced to minimal or zero resistance when coasting is desired. This parameter adjustment capability allows the trainer to transition between providing significant resistance and allowing free-wheeling coasting, giving the rider control over the training experience without the mechanical constraints of conventional roller-based systems.
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
The system provides improved level adjustment, portability, and compatibility with various wheel sizes, offers a more realistic and consistent workout experience by reducing friction and torque requirements, and enhances power measurement accuracy and control.
Implementation Method 1
a magnetic brake assembly controlled via a computing device using an API to simulate various riding conditions
Data Source
AI summary
A system and method for controlling an exercise device are provided herein. The system includes a memory having computer-executable instructions and at least one processor to execute the computer-executable instructions to wirelessly connect the exercise device, receive a training mode, receive at least one variable for determining a power set point, determine the power set point responsive to the training mode and the at least one variable and control a magnetic brake assembly in the exercise device responsive to the power set point.