Bicycle Power Measurement Using Single Pedal Sensor
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Solution Overview
Problem
Existing systems for measuring output power in pedal vehicles, such as bicycles, are complex, expensive, and require specialized installation, limiting their accessibility to the general public and preventing optimal use of motor-driven pedal-assist systems.
Innovation Solution
A simplified system using a single pressure sensor on a pedal to measure orthogonal force, combined with angular position sensors and a calculator applying pre-established force distribution models to determine tangential force and output power, with wireless communication and easy installation features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a network of several strain gauges is used to measure output power, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential measurement component (single strain gauge) from the complex network of multiple strain gauges, while using mathematical modeling to compensate for the simplified sensor arrangement. This maintains measurement capability while dramatically reducing system complexity.
Solution Approach 2:
The patent changes the measurement approach from direct multi-dimensional force measurement to a simplified model-based calculation using a single strain gauge reading combined with angular position data. This parameter transformation enables accurate output power measurement with fewer sensors.
2Measurement precision
If a complex strain gauge network is implemented, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent removes the complex network architecture and retains only a single strain gauge, making the system much easier to manufacture and install. The extracted essential measurement function is enhanced through mathematical modeling rather than additional hardware.
Solution Approach 2:
The patent uses a mathematical model (virtual copy) to represent the complex force distribution that would otherwise require multiple physical sensors. This virtual modeling approach replicates the functionality of a complex sensor network using simple hardware.
3Measurement precision
If multiple sensors and complex arrangements are used, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent extracts the core measurement function to a single strain gauge, eliminating the need for complex installation procedures. The system can be installed by standard technicians rather than requiring specialized staff, while maintaining measurement accuracy through the mathematical model.
4Device complexity
If a simplified single sensor system is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent transforms the measurement problem by changing from direct physical measurement of multiple force components to a calculated derivation using a single sensor reading combined with angular position data and biomechanical modeling. This parameter transformation maintains precision while reducing complexity.
Solution Approach 2:
The patent creates a virtual model of the force distribution that compensates for the simplified physical sensor arrangement. This mathematical copy enables accurate output power calculation from minimal physical measurements.
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 accessible output power measurement, reducing complexity and cost, enabling broader public use and optimizing pedal-assist motor control without requiring dedicated staff for installation.
Implementation Method 1
a single pressure sensor capable of measuring the orthogonal force exerted by the user on the pedal
Implementation Method 2
at least one sensor for determining the angular position of the crank around a rotation axis of the crankset
Data Source
AI summary
A method and system for measuring the output power produced in a device having a crankset, includes: measuring the orthogonal force exerted on at least one pedal of the crank; determining the angular velocity of the crank; and deducing the tangential force exerted on the crank and the power, using a pre-established model of the distribution of the force exerted on the actuating member as a function of the angular velocity.