E-Bike Tire Diagnosis Using Pedal Speed, Wheel Speed, and Torque
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Solution Overview
Problem
Bicycles equipped with electric modules can malfunction due to tire damage or insufficient air pressure, leading to ineffective operation and strain on the electric module.
Innovation Solution
An electric module for bicycles that includes a pedal rotation speed detector, driving wheel rotation speed detector, and control device to diagnose tire conditions by analyzing rotation speeds and torque, estimating air pressure, and correcting motor torque based on these measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tire pressure is not monitored, then device complexity is reduced, but reliability deteriorates due to undetected tire abnormalities causing malfunction
Solution Approach 1:
The system uses existing sensors (pedal rotation speed detector, driving wheel rotation speed detector, torque sensor) to automatically monitor tire conditions without requiring separate pressure sensors. The control device processes data from these existing components to diagnose tire abnormalities, making the existing system serve the additional function of tire monitoring.
Solution Approach 2:
The control device acts as an intermediary that analyzes the relationship between pedal rotation speed, driving wheel rotation speed, and torque to indirectly determine tire pressure conditions. This mediator approach allows tire pressure monitoring without direct pressure measurement.
2Measurement precision
If separate pressure sensors are installed, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The existing sensors in the electric bicycle system are utilized to perform tire pressure monitoring functions. The pedal rotation speed detector, driving wheel rotation speed detector, and torque sensor work together to provide tire condition information without requiring additional dedicated pressure sensors.
Solution Approach 2:
The control device performs multiple functions: it controls motor operation based on user input and simultaneously monitors tire conditions by analyzing sensor data. This multi-functionality eliminates the need for separate dedicated systems for different monitoring tasks.
3Object-affected harmful factors
If tire abnormalities are not detected, then ease of operation is maintained, but harmful factors increase due to potential safety issues
Solution Approach 1:
The control device continuously receives data from rotation speed detectors and torque sensors, processes this information to determine tire conditions, and provides feedback to the user through the user interface device when tire abnormalities are detected. This closed-loop feedback system maintains safety without requiring user intervention.
Solution Approach 2:
The system automatically monitors and diagnoses tire conditions without requiring user action. The control device independently analyzes sensor data and alerts users to potential safety issues, making the safety monitoring function self-executing.
Data Source
AI summary
An electric module for a bicycle according to an example embodiment of the present disclosure is equipped on the bicycle including a pedal configured to generate rotational energy and a driving wheel configured to rotate by receiving power, and the electric module includes a pedal rotation speed detector configured to measure a rotation speed of the pedal, a motor configured to rotate the driving wheel, a driving wheel rotation speed detector configured to measure a rotation speed of the driving wheel, a control device configured to determine whether a tire is abnormal based on the rotation speed of the pedal, a torque of the motor, and the rotation speed of the driving wheel, and a user interface device configured to display condition information of the tire provided by the control device.