Tire-side device vibration feature extraction for road surface estimation
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Solution Overview
Problem
Existing tire-side systems face high power and memory consumption when calculating the degree of similarity for road surface condition determination, either by processing it in the tire controller or through frequent data transmission, leading to inefficient power usage and memory storage.
Innovation Solution
A tire-side device that extracts feature quantities from tire vibration data, stores past data, and transmits only when a variation in road surface conditions is detected, reducing communication frequency and eliminating the need for support vector storage in the tire controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the tire controller calculates the degree of similarity for road surface condition determination, then road surface condition estimation accuracy is improved, but power consumption and memory usage increase
Solution Approach 1:
The patent extracts only the necessary feature quantities from vibration data and transmits them to the vehicle body side system for similarity calculation, rather than having the tire controller perform the complete road surface condition determination process. This separates the feature extraction function (performed in the tire controller) from the similarity calculation function (performed in the vehicle body side system), reducing power consumption and memory requirements in the tire controller while maintaining estimation accuracy.
2Measurement precision
If the tire controller stores support vectors for similarity calculation, then road surface condition determination accuracy is improved, but memory consumption increases
Solution Approach 1:
The patent removes the support vector storage requirement from the tire controller by transferring the similarity calculation function to the vehicle body side system. The tire controller only needs to store and transmit feature quantities extracted from vibration data, eliminating the need to store large amounts of support vector data in the limited tire controller memory.
3Measurement precision
If the tire controller transmits vibration data frequently for road surface condition determination, then estimation accuracy is improved, but communication load and power consumption increase
Solution Approach 1:
The patent extracts only the essential feature quantities from the complete vibration data and transmits only these extracted features to the vehicle body side system. This selective transmission reduces the data volume and communication frequency required for accurate road surface condition estimation, thereby reducing power consumption associated with wireless communication.
4Measurement precision
If the tire controller processes complete vibration data for similarity calculation, then road surface condition determination accuracy is improved, but device complexity increases
Solution Approach 1:
The patent divides the road surface condition determination system into two segments: the tire controller that performs vibration data acquisition and feature quantity extraction, and the vehicle body side system that performs similarity calculation and final determination. This segmentation reduces the processing complexity of the tire controller while maintaining overall system accuracy through distributed computation.
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 approach conserves power and memory in the tire controller by reducing unnecessary data transmission and storage, while maintaining accurate road surface condition estimation through selective data transmission and processing.
Implementation Method 1
A rear surface of a tire tread may include an acceleration sensor, and the acceleration sensor detects vibration of a tire
Data Source
AI summary
A tire-side device is attached to a tire included in a vehicle and applied to a tire apparatus for estimating a condition of a road surface on which the vehicle travels. The tire-side device includes: a vibration detector outputting a detection signal according to a level of vibration of the tire; a controller having a feature quantity extraction device extracting a feature quantity of the detection signal in one rotation of the tire; and a transmitter transmitting road surface data including the feature quantity extracted by the feature quantity extraction device.