Bicycle Trainer Compensation Algorithm for Multi-Groove Belt Mechanical Loss
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Solution Overview
Problem
Bicycle trainers with multi-groove belt transmission systems experience mechanical loss, leading to inefficiency as the input effort exceeds the power output, making it challenging to accurately measure the actual power applied to the trainer.
Innovation Solution
A compensation algorithm is developed to determine the mechanical loss by recording and analyzing the external driving torque, rotating speed, and no-load mechanical loss over various conditions, fitting relationships to create a compensation algorithm that accurately measures the power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multi-groove belt transmission is used in bicycle trainer, then the structure is simpler and easier to manufacture, but mechanical loss increases and power measurement accuracy deteriorates
Solution Approach 1:
The patent converts the harmful mechanical loss in multi-groove belt transmission into a measurable and compensatable parameter. By characterizing the relationship between mechanical loss and operating conditions (speed, load), the patent transforms the previously harmful and unquantifiable energy loss into a useful basis for compensation algorithms, thereby maintaining the simple belt transmission structure while eliminating its negative impact on measurement accuracy.
2Ease of manufacture
If multi-groove belt transmission is used in bicycle trainer, then the structure is simpler and easier to manufacture, but power measurement accuracy deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the mechanical loss characteristics of the multi-groove belt transmission are measured and characterized under various operating conditions. This feedback information is then used to develop compensation algorithms that correct the power measurements, thereby maintaining the manufacturing simplicity of belt transmission while achieving accurate power measurement through iterative refinement of the compensation model.
Solution Approach 2:
The patent changes the approach from directly measuring power with simple sensors to using a comprehensive model that accounts for multiple parameters including belt transmission mechanical loss, motor efficiency, and operating conditions. By transforming the measurement from a direct single-parameter approach to a multi-parameter compensation model, the patent achieves high measurement accuracy while preserving the simple mechanical structure.
3Measurement precision
If mechanical loss compensation algorithm is implemented, then power measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical measurement systems with a computational approach. Instead of using highly precise mechanical sensors and transmission systems to directly measure power, the patent uses standard sensors combined with a mechanical loss compensation algorithm. This substitution of mechanical precision requirements with computational correction reduces overall device complexity while maintaining or improving measurement accuracy.
Data Source
AI summary
A bicycle trainer compensation algorithm based on multi-groove belts sliding relative to one another includes: determining a load interval and a rotating speed range, recording an external driving torque, a rotating speed, a measured torque and a no-load mechanical loss of the bicycle trainer under conditions of different loads and different rotating speeds, and obtaining a relationship between a mechanical loss of a whole machine and the different rotating speeds, the different loads, and the no-load mechanical loss, fitting a plurality of sets of relationships to obtain an algorithm relation, verifying universality of the algorithm relation, and further fitting to obtain a compensation algorithm relation, and verifying whether a compensation accuracy of the compensation algorithm relation is satisfied within an error requirement.