3-Axis Acceleration Sensor Valid Output Section Setting
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Solution Overview
Problem
Conventional 3-axis acceleration sensors mounted within tires face significant noise interference when detecting information between the tire and the ground surface, making it difficult to distinguish valid output sections in the x-axis, y-axis, and z-axis directions during vehicle tests.
Innovation Solution
The method involves setting the output signal in the z-axis direction as a reference, identifying specific sections with positive and negative peak values as valid, and correlating these sections in the x-axis and y-axis directions to filter out noise, allowing only signals from these validated sections to be processed for detecting tire-ground surface information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a 3-axis acceleration sensor is mounted within a tire to measure accelerations in x-axis, y-axis and z-axis directions separately, then the sensor can theoretically detect tire-ground surface information, but severe noise components are added to the output signals making it difficult to detect valid output sections
Solution Approach 1:
The patent combines the output signals from all three axes (x-axis, y-axis, and z-axis) of the acceleration sensor into a single composite signal. By merging these signals, the system leverages the complementary information from each axis to enhance the signal-to-noise ratio, making valid tire-ground contact information detectable despite severe noise contamination in individual axes.
Solution Approach 2:
The patent introduces a signal processing intermediary that processes the combined acceleration signals from multiple axes. This intermediary system identifies valid output sections by analyzing the composite signal characteristics, effectively filtering out noise components while preserving the underlying tire-ground contact information that would be obscured in individual axis measurements.
2Ease of operation
If output signals from each axis are processed separately to identify valid sections, then individual axis analysis is simple, but noise components cannot be effectively minimized and valid sections cannot be accurately detected
Solution Approach 1:
Instead of processing each axis separately, the patent merges the output signals from all three axes into a composite signal for unified processing. This approach maintains operational simplicity while dramatically improving the accuracy of valid section detection by utilizing the combined information content that reduces noise impact.
3Measurement precision
If the z-axis signal is used as a reference to define valid sections, then valid output sections can be precisely identified, but the method becomes more complex compared to processing each axis independently
Solution Approach 1:
The patent uses the z-axis signal as an intermediary reference to identify valid output sections. By establishing the z-axis signal characteristics as a reference framework, the system can precisely determine when the tire is in contact with the ground surface, and then apply this reference to validate corresponding sections in the x-axis and y-axis signals.
Data Source
AI summary
Disclosed herein is a method of setting valid output sections of a 3-axis acceleration sensor mounted within a tire of a vehicle, including setting an output signal of the 3-axis acceleration sensor in the z-axis direction as a reference signal, setting a specific section of the output signal in the z-axis direction as a valid section where a part of the tire where the 3-axis acceleration sensor is mounted contacts a road surface, and setting sections of output signals of the 3-axis acceleration sensor in the x-axis and y-axis directions corresponding to the valid section in the z-axis direction as valid sections in the x-axis and y-axis directions. The method sets precise valid sections applied to detect information between the tire and a ground surface so as to minimize a component of a noise section by connecting output signals in the x-axis, y-axis and z-axis directions.