Electric Bicycle Speed Signal Manipulation Detection
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Solution Overview
Problem
Existing electric bicycles face challenges in reliably and cost-effectively detecting manipulated speed signals from sensors, which can lead to improper regulation of the traction motor, potentially causing safety issues and legal compliance problems.
Innovation Solution
An electric bicycle equipped with a manipulation detection unit that compares actual total drive power with a calculated target drive power, using sensors for motor speed, torque, and environmental factors to identify deviations and detect signal manipulation, allowing for simple and cost-effective intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a second sensor is added to detect speed signal manipulation, then detection reliability is improved, but device complexity and cost increase
Solution Approach 1:
The system uses existing sensors (acceleration sensor, torque sensor, speed sensor) to detect manipulation. The manipulation detection unit analyzes data from these existing components without requiring additional sensors, making the system self-sufficient and avoiding increased complexity
Solution Approach 2:
The system continuously monitors the relationship between acceleration, torque, and speed signals, comparing actual values with expected values based on physical laws. This feedback mechanism enables reliable detection of manipulations while using only existing sensors
2Measurement precision
If transmission ratio and gear shift considerations are included in speed calculation, then measurement precision is improved, but device complexity and calculation complexity increase
Solution Approach 1:
The system leverages existing data from the controller about transmission ratio and gear shift position. Rather than adding new sensors or complex mechanical systems, it uses information already available in the control unit to achieve precise speed measurement
Solution Approach 2:
The manipulation detection unit serves multiple functions: it calculates actual speed using transmission ratio data, detects signal manipulation, and validates sensor readings. This multi-functionality achieves precise measurement without increasing device complexity
3Reliability
If manipulation detection is continuously performed, then detection reliability is improved, but energy consumption increases
Solution Approach 1:
The manipulation detection unit performs detection at specific intervals or under specific conditions (e.g., when certain thresholds are exceeded) rather than continuously. This periodic approach maintains detection reliability while significantly reducing energy consumption compared to continuous monitoring
Solution Approach 2:
The system focuses detection efforts on critical moments or conditions where manipulation is most likely to occur, performing full analysis only when necessary. This partial action approach maintains reliability for detecting actual manipulations while minimizing unnecessary energy expenditure
Data Source
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AI summary
The invention relates to an electric bicycle with a front wheel (24), a rear wheel (22), an electric traction motor (30) which drives the front wheel (24) or the rear wheel (22), a traction accumulator (34) for supplying the traction motor (30) with electrical energy, an electric bicycle speed sensor (82) for determining the current electric bicycle speed, an electric bicycle controller (50) for controlling the traction motor (30), wherein the electric bicycle controller (50) regulates the traction motor (30) at a maximum electric bicycle speed, and a tamper detection unit (54) for detecting manipulation of an electric bicycle speed signal from the electric bicycle speed sensor (82).wherein the manipulation detection unit (54) compares an actual total drive power generated by the traction motor (30) and/or by a rider with a target drive power calculated from the electric bicycle speed and detects manipulation of the electric bicycle speed signal if the target drive power deviates from the actual total drive power.