Pedal Sensor Torsional Bending for Accuracy
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Solution Overview
Problem
Conventional pedal operation amount detection apparatuses face a trade-off between improving detection accuracy and increasing the breaking limit of the sensor member, where enhancing one aspect compromises the other, leading to incompatible improvements.
Innovation Solution
A pedal operation amount detection apparatus featuring a sensor member with rod-shaped torsional deformation portions forming an 8-shape, disposed to experience both bending and torsional deformation, allowing for increased deformation without lowering stiffness, and a compact configuration that stabilizes the sensor member's posture for enhanced accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the deformation amount of the sensor member is increased to improve detection accuracy, then detection accuracy is improved, but the breaking limit of the sensor member is lowered
Solution Approach 1:
The sensor member is configured to experience both bending deformation and torsional deformation simultaneously, transitioning from a single-mode deformation approach to a multi-dimensional deformation approach. This allows the sensor to achieve greater effective deformation for improved detection accuracy while the torsional component helps maintain structural strength and breaking limit.
Solution Approach 2:
The patent changes the deformation mode parameters by introducing torsional deformation in addition to bending deformation. This parameter change allows the sensor member to operate in a regime where both detection sensitivity and structural strength are optimized, resolving the trade-off between detection accuracy and breaking limit.
2Strength
If the stiffness of the sensor member is enhanced to raise the breaking limit, then the breaking limit is raised, but the detection accuracy is lowered
Solution Approach 1:
By introducing torsional deformation as an additional deformation mode alongside bending deformation, the system can maintain higher stiffness (which provides better breaking limit) while still achieving sufficient detection accuracy through the combined deformation effect. The torsional component compensates for the reduced bending deformation caused by higher stiffness.
3Measurement precision
If the sensor member is configured to experience both bending and torsional deformation, then deformation amount increases without lowering stiffness, but the device complexity increases
Solution Approach 1:
The sensor member integrates both bending and torsional deformation capabilities into a single unified structure rather than using separate sensors or mechanisms. This merging approach achieves the desired deformation characteristics while minimizing device complexity by consolidating multiple functions into one component.
Solution Approach 2:
The sensor member is designed to perform multiple functions simultaneously: it experiences both bending and torsional deformation to detect operational parameters, while also maintaining structural strength. This multi-functionality reduces the need for additional components and simplifies the overall device configuration.
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
This configuration enables improved detection accuracy while maintaining the breaking limit, allowing for a compact and stable detection apparatus that accurately measures pedal operation forces and strokes without excessive deformation or damage.
Implementation Method 1
a sensor member disposed on a load transmission path of the transmitting member and deformed by the depressing operation force and the reaction force and that electrically detects deformation of the sensor member
Implementation Method 2
the sensor member is an elongate member that is torsionally and elastically deformable about a torsion center line S in a longitudinal direction
Data Source
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AI summary
A pedal actuation amount detection device that electrically detects the deformation of a sensor member which is disposed along a load transmission path is made compact in size without sacrificing stiffness, and the amount of the deformation of the sensor member is increased to increase detection accuracy. A longitudinal-shaped sensor member (30) that is capable of torsional elastic deformation around a torsional center line (S) in a longitudinal direction is disposed at a position offset from a pedal arm (18) in a direction parallel with a support axis (O), and a reaction force acting portion at which a reaction force (R) acts is set at a position separated from the torsional center line (S) in the direction parallel with the support axis (O). Therefore, the sensor member (30) is flexurally deformed and torsionally deformed around the torsional center line (S) when a pedal is in operation. Therefore, it is possible to increase the deformation amount (relative displacement stroke of an operation input portion and the reaction force acting portion) of the sensor member (30) using a small space without sacrificing stiffness when compared to bending deformation only, and it is possible to make a pedal actuation amount detection device (10) compact in size while improving detection accuracy thereof.