Front Fork Stroke Sensor Temperature Compensation Layout
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing suspension devices with stroke sensors face accuracy issues due to temperature variations, affecting the precision of the sensor's measurements.
Innovation Solution
A correction unit is integrated inside the cylindrical body to adjust the movement amount detected by the stroke sensor based on temperature, comprising a substrate and a capacitor that compensates for temperature-induced changes in inductance and capacitance, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a stroke sensor is mounted in the suspension device to detect stroke amount, then the stroke amount can be detected, but temperature variations affect the accuracy of the sensor measurements
Solution Approach 1:
The patent introduces a correction unit that changes the electrical parameters (capacitance and inductance) based on temperature to compensate for the stroke sensor's temperature characteristics. The correction unit includes a capacitor and coil whose values are adjusted according to temperature variations, thereby correcting the detected stroke amount and maintaining measurement accuracy across different temperatures.
2Measurement precision
If a correction unit is added to compensate for temperature effects, then temperature characteristics are improved, but the device complexity increases
Solution Approach 1:
The correction unit is integrated into the existing sensor system by combining the capacitor and coil with the stroke sensor's LC oscillation circuit. The correction unit shares the same housing and electrical connection structure, merging the temperature compensation function with the existing sensor assembly rather than adding a separate standalone correction device.
Solution Approach 2:
The correction unit serves multiple functions: it provides temperature compensation for the stroke sensor while also forming part of the LC oscillation circuit used for stroke detection. The capacitor and coil components contribute to both the correction function and the oscillation circuit operation, reducing the need for additional separate components.
3Volume of moving object
If the correction unit is disposed inside the cylindrical body, then the device remains compact, but the space for component arrangement is limited
Solution Approach 1:
The correction unit components (capacitor, coil, and housing) are nested within the existing cylindrical body structure of the suspension device. The correction unit's housing is disposed inside the cylindrical body, and the capacitor and coil are arranged within the correction unit's housing, creating a nested configuration that maximizes space utilization.
Solution Approach 2:
The patent arranges the correction unit components in a radial configuration around the central axis of the cylindrical body. The coil is wound radially, and the capacitor is positioned in the radial direction, utilizing the radial dimension of the cylindrical space rather than only axial arrangement, thereby efficiently using the available three-dimensional space.
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 enhances the temperature characteristics of the sensor, maintaining accuracy across varying temperatures without increasing the device's size, and allows for a compact and cost-effective implementation.
Implementation Method 1
a correction unit (40, 40A, 40B) disposed inside the outer tube or the inner tube, and configured to correct the movement amount detected by the stroke sensor based on a temperature inside the outer tube or the inner tube
Implementation Method 2
When an alternating current flows through the coil, an eddy current is generated in the conductor so as to cancel a fluctuation of a magnetic field. When the eddy current is generated, an inductance of the coil is changed due to the influence of the eddy current.
Implementation Method 3
Accordingly, a resonance frequency of an LC oscillation circuit is changed, and a stroke amount can be obtained from the resonance frequency.
Data Source
AI summary
A suspension device includes an outer tube formed of a cylindrical body an inner tube disposed coaxially with the outer tube and provided to be movable relative to the outer tube, a tip end of the inner tube being disposed inside the outer tube, a cable harness extending from an outer side of the outer tube or the inner tube to an inner side and configured to be energized, a stroke sensor configured to detect a movement amount of the inner tube relative to the outer tube, two connection members disposed between the stroke sensor and the cable harness and connecting the stroke sensor and the cable harness, and a correction unit disposed inside the outer tube or the inner tube and configured to correct the movement amount detected by the stroke sensor based on a temperature inside the outer tube or the inner tube.