Pedaling Force Measurement Device Using Segmented Strain Sensors
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Solution Overview
Problem
Conventional pedaling force measurement devices face challenges in measuring a single parameter, such as bending moment force component, with high precision due to interference from other parameters.
Innovation Solution
A pedaling force measurement device comprising a strain-flexing part, a parameter detection part, and an interference suppression part, which uses multiple strain sensors and Wheatstone bridge circuits to detect and suppress interference, allowing precise measurement of pedaling force parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single strain sensor is used to measure one parameter, then the device complexity is reduced, but the measurement precision deteriorates due to interference from other parameters
Solution Approach 1:
The patent divides the measurement function into multiple independent strain sensors, each dedicated to detecting a specific force component (vertical, longitudinal, pedal axial direction). This segmentation allows each sensor to measure its target parameter without interference from other parameters, thereby improving measurement precision while maintaining manageable device complexity through functional specialization.
Solution Approach 2:
The patent employs a multi-functional parameter detection part that simultaneously detects multiple force components using multiple strain sensors. This multi-functionality approach allows the system to measure various pedaling force parameters (vertical force, longitudinal force, pedal axial force) in parallel, improving overall measurement precision without requiring separate measurement systems for each parameter.
2Measurement precision
If multiple strain sensors are used to detect multiple force components, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple strain sensors into a unified parameter detection part that simultaneously detects multiple force components. By merging the detection functions and integrating the sensors into a single coordinated system, the patent improves measurement precision for multiple parameters while avoiding the complexity increase that would result from using completely separate measurement systems.
3Difficulty of detecting and measuring
If strain sensors are used to detect force components, then the measurement capability is improved, but interference from other parameters causes errors in detected output
Solution Approach 1:
The patent segments the detection of force components by assigning specific strain sensors to detect specific force components (vertical, longitudinal, pedal axial direction). This segmentation ensures that each sensor measures only its designated parameter without being influenced by other parameters, thereby eliminating measurement errors caused by parameter interference while maintaining comprehensive detection capability.
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
Enables precise measurement of pedaling force parameters by effectively suppressing interference from other parameters, improving the accuracy of detected outputs.
Implementation Method 1
The strain-flexing part is configured to receive a strain acting on the crank arm from pedaling. The parameter detection part is disposed on the strain-flexing part to detect the parameters from the strain acting on the strain-flexing part.
Implementation Method 2
each of the first through fourth strain sensors comprises at least two strain gauge elements forming a Wheatstone bridge circuit
Data Source
AI summary
A first pedaling force measurement device measures a plurality of pedaling force parameters acting on a first crank arm to one end of which a first pedal can be attached and to another end of which a crank shaft can be attached. The first pedaling force measurement device is provided with a strain-flexing part, a first parameter detection part and a first interference suppression part. Strain acting on the first crank arm is conveyed to the strain-flexing part. The parameter detection part is disposed on the strain-flexing part, and detects a plurality of parameters based on the strain being conveyed to the strain-flexing part. The interference suppression part suppresses interference in one parameter detected by the parameter detection part from the other parameters.