Electric Bicycle Theft Detection via Motor Torque and Wheel Speed
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Solution Overview
Problem
Electric bicycles are prone to theft due to their high value, and existing technologies lack effective methods for immediate theft detection and notification to users.
Innovation Solution
An electric bicycle theft detection system that includes a pedal, pedal rotating speed detector, driving wheel, motor, driving wheel rotating speed detector, control device, and user interface, which detects theft based on pedal and motor torque, and driving wheel speed, and generates a warning signal when these conditions are met, optionally using gyro sensors and GPS for additional detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If theft detection systems are installed in electric bicycles, then theft detection capability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple existing sensors (pedal rotating speed detector, driving wheel rotating speed detector, torque sensor) that are already part of the electric bicycle's motor control system into a theft detection function. By merging these existing components rather than adding entirely new separate systems, the patent improves theft detection capability while minimizing the increase in overall device complexity.
Solution Approach 2:
The control device that originally serves solely for motor control is extended to perform dual functions: motor control and theft detection. This multi-functionality approach allows the system to detect theft conditions (zero pedal rotation, zero torque, non-zero wheel rotation) using existing hardware, thereby improving detection capability without proportionally increasing system complexity.
2Measurement precision
If multiple sensors are added for accurate theft detection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system merges data from existing sensors (pedal rotating speed detector, driving wheel rotating speed detector, torque sensor) that are already integrated into the electric bicycle's motor control system. This approach achieves accurate theft detection by combining information from multiple sensors while avoiding the need to add entirely new separate sensor systems, thus improving measurement precision with minimal complexity increase.
3Loss of time
If immediate warning signals are generated upon theft detection, then response time is improved, but false alarm rate may increase
Solution Approach 1:
The system performs preliminary analysis by checking multiple conditions simultaneously (pedal rotation speed = 0, torque = 0, driving wheel rotation speed ≠ 0) before generating a theft alarm. This preliminary verification step helps filter out false alarms while maintaining quick response time, as the system is already prepared with the detection logic and can immediately issue warnings when the combined conditions are met.
Solution Approach 2:
The control device continuously monitors the operating conditions of the electric bicycle and provides feedback to determine whether theft conditions exist. By maintaining continuous monitoring and using the feedback from multiple sensors to verify theft conditions, the system achieves both rapid response and reduced false alarms through thorough condition verification.
Data Source
AI summary
According to an embodiment of the present invention, An electric bicycle theft detection system includes: a pedal; a pedal rotation speed detector configured to measure a rotation speed of the pedal; a driving wheel configured to rotate by receiving power; a motor configured to rotate the driving wheel; a driving wheel rotation speed detector configured to measure the rotation speed of the driving wheel; a control device configured to detect theft 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 generate a warning signal when the control device detects the theft.