Electric Bicycle Motor Assistance Control via Heart Rate and Power Feedback
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Solution Overview
Problem
Conventional electric bicycle assistance systems fail to effectively maintain the user's heart rate within a target interval, leading to potential sport injuries due to inadequate motor assistance adjustments based solely on current heart rate.
Innovation Solution
An electric bicycle assistance controlling method and system that utilizes an operation processor connected to human power and heart rate detectors to define preset health levels and power intervals, analyzing current human power and heart rate to provide appropriate motor assistance levels, ensuring the heart rate remains within a target range by adjusting assistance accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the assistance motor increases motor assistance to reduce user effort, then the heart rate decreases, but the heart rate may fall below the target heart rate interval
Solution Approach 1:
The system continuously monitors both heart rate and human power output, using this feedback to dynamically adjust motor assistance. When heart rate is above target, assistance increases; when below target, assistance decreases. This closed-loop feedback mechanism resolves the contradiction by preventing heart rate from falling below the target interval while still providing assistance to reduce user effort.
Solution Approach 2:
The motor assistance level is dynamically adjusted based on real-time monitoring of heart rate and human power. The system transitions from static assistance levels to dynamic adjustment, allowing the assistance to adapt continuously to maintain heart rate within the target interval while optimizing user effort reduction.
2Ease of operation
If the assistance motor decreases motor assistance to increase user effort, then the heart rate increases, but the heart rate may exceed the target heart rate interval
Solution Approach 1:
The continuous feedback loop monitors heart rate and adjusts motor assistance accordingly. When heart rate drops below the target interval, the system reduces assistance to allow heart rate to rise back into the target range, preventing excessive heart rate elevation while maintaining training effectiveness.
Solution Approach 2:
The system employs dynamic adjustment of motor assistance based on real-time heart rate and power output conditions, enabling precise control to keep heart rate within the target interval while appropriately challenging the user.
3Device complexity
If the system controls motor assistance based only on current heart rate, then the control is simple, but the system cannot effectively restrict heart rate within the target interval
Solution Approach 1:
The system performs preliminary analysis of human power output trends to predict future heart rate changes before they occur. By detecting the relationship between power output and heart rate trends, the system can proactively adjust motor assistance to prevent heart rate from leaving the target interval, improving control reliability without significantly increasing complexity.
4Reliability
If the system uses multiple parameters (heart rate and human power) for control, then heart rate control accuracy improves, but the system complexity increases
Solution Approach 1:
The system merges heart rate monitoring with human power output detection into a unified control algorithm. By combining these two parameters and analyzing their relationship, the system achieves more accurate heart rate interval maintenance while keeping the control logic integrated and manageable, rather than treating them as separate control systems.
Data Source
AI summary
An electric bicycle assistance controlling method and an assistance controlling system are applied to an operation processor of an electric bicycle. The electric bicycle assistance controlling method includes defining several health levels and a first power interval and a second power interval, acquiring one health level and a target heart rate interval, and measuring a current human power and a current heart rate. When the current heart rate is within the target heart rate interval, the operation processor determines the assistance controlling system to output a second motor assistance in response to the current human power inside the first power interval, and determines the assistance controlling system to output a third motor assistance in response to the current human power inside the second power interval.