Bicycle Wheel Speed Sensor with Calibration Element
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Solution Overview
Problem
Existing bicycle wheel rotational speed measurement systems are prone to manipulation and errors, particularly in e-bikes, leading to inaccurate speed readings and potential illegal usage.
Innovation Solution
An incremental measuring path system for bicycles featuring signal transmitters and a sensor element, where at least one transmitter is designed as a calibration element with a distinct signal path, ensuring reliable rotational speed detection and tamper-proof measurements by scanning a unique signal path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional magnetic or optical sensors are used to detect wheel rotational speed, then the system structure is simple and easy to manufacture, but the system is prone to manipulation and detection errors
Solution Approach 1:
The patent applies local quality by creating signal transmitters with non-uniform signal paths - most signal paths have a standard length, but at least one calibration signal path has a different length. This local differentiation allows the sensor to distinguish between regular wheel rotations and manipulation attempts, significantly improving detection reliability without requiring a completely complex new system architecture.
Solution Approach 2:
The patent changes the parameter of signal path length to create a calibration element. By varying the length of at least one signal path compared to others, the system creates a detectable parameter change that serves as a reference for verifying proper wheel rotation, thereby enhancing reliability while maintaining relatively simple device structure.
2Measurement precision
If multiple signal transmitters with identical signal paths are used, then the manufacturing process is simple and consistent, but the system cannot detect manipulation or errors in rotational speed measurement
Solution Approach 1:
The patent applies local quality by creating signal transmitters with non-uniform signal paths - most signal paths have a standard length, but at least one calibration signal path has a different length. This local differentiation allows the sensor to distinguish between regular wheel rotations and manipulation attempts, significantly improving detection reliability without requiring a completely complex new system architecture.
Solution Approach 2:
The patent applies asymmetry by introducing at least one calibration signal path with a different length among otherwise identical signal paths. This asymmetric feature creates a unique signature that allows the sensor to verify proper wheel rotation and detect manipulation, improving measurement precision while maintaining ease of manufacture through a mostly uniform design.
3Reliability
If a calibration element with a distinct signal path is introduced, then manipulation detection and measurement accuracy are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by creating signal transmitters with non-uniform signal paths - most signal paths have a standard length, but at least one calibration signal path has a different length. This local differentiation allows the sensor to distinguish between regular wheel rotations and manipulation attempts, significantly improving detection reliability without requiring a completely complex new system architecture.
Solution Approach 2:
The patent applies universality by designing the calibration signal path to serve multiple functions: it acts as a reference for measuring wheel rotation accuracy, serves as a tamper-detection marker, and provides a basis for calibrating the sensor. This multi-functionality improves reliability without proportionally increasing device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides accurate and secure rotational speed measurements by detecting a calibration element with each full rotation, effectively preventing manipulation and enhancing detection reliability.
Implementation Method 1
signal transmitters rotate past the sensor element to scan at least one signal path and generate at least one extractable measurement signal
Data Source
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AI summary
The present invention relates to an incremental measuring system for a bicycle (100) for determining the rotational speed of a wheel (3) of the bicycle (100) relative to a fixed point on the bicycle (100), comprising at least one signal transmitter means (210) with a plurality of signal transmitters (212), optionally arranged in a signal transmitter plane E, and at least one sensor means (96) cooperating with these signal transmitters (212), wherein the signal transmitter means (210) on the wheel (3) and the sensor means (96) on the fixed point (2), or vice versa, can be arranged such that when the wheel (3) rotates, the signal transmitters (212) rotate past the sensor element (96) to scan at least one signal path (214, 218) and generate at least one extractable measurement signal, wherein at least one signal transmitter (212) is designed as a calibration element (98), comprising at least one signal path (218) that is separated from the signal paths (214) of the other signal transmitter (212) is designed differently.Furthermore, the invention relates to a bicycle with and a signal transmitter for such a distance measuring system.