Tire Tread Acceleration Sensing With Median-Value Extraction
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Solution Overview
Problem
When an acceleration sensor is mounted on the inner surface of a tire's tread, the deformation caused by ground contact affects the detected centrifugal acceleration, leading to inaccurate tire state detection.
Innovation Solution
A tire state detection system that uses a sensor unit with an acceleration sensor mounted on the inner surface of the tread, where the sensor unit acquires and processes acceleration data by extracting median values from multiple readings to minimize the impact of ground contact deformation, allowing for accurate vehicle speed and traveling distance calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the acceleration sensor is mounted on the inner surface of the tread to detect road surface condition, then the road surface detection capability is improved, but the detected acceleration is momentarily largely dropped when the mounting position touches the ground, causing inaccurate tire state detection
Solution Approach 1:
The patent applies dynamics by making the acceleration sensor mounting position movable relative to the tread inner surface. The sensor is mounted on a sensor unit that can be positioned at different locations, allowing the system to dynamically select optimal mounting positions that avoid ground contact deformation while maintaining road surface detection capability
Solution Approach 2:
The patent introduces an intermediary structure - the sensor unit with multiple acceleration sensors arranged in different directions. This intermediary allows the system to detect road surface conditions through one sensor while using other sensors to compensate for ground contact effects, thereby maintaining measurement precision
2Device complexity
If the acceleration sensor is mounted on the rim wheel as integrated with the air valve, then the device complexity is reduced, but the road surface condition detection capability is insufficient
Solution Approach 1:
The patent segments the sensor system into multiple independent acceleration sensors mounted on the sensor unit, with each sensor oriented in different directions. This segmentation allows the system to detect road surface conditions from multiple angles while maintaining a relatively simple overall structure
Solution Approach 2:
The sensor unit serves multiple functions: it detects road surface conditions, measures tire rotation for speed calculation, and provides redundancy to compensate for ground contact effects. This multi-functionality eliminates the need for separate mounting structures for different detection purposes
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 enables accurate detection of tire state without being affected by ground contact, reducing power consumption and improving the accuracy of vehicle speed and traveling distance calculations while suppressing the influence of instantaneous acceleration drops.
Implementation Method 1
the detected acceleration (centrifugal acceleration) in the tire radial direction is momentarily largely dropped
Data Source
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Figure 5
AI summary
A processing device (120) of a tire state detection system (100) is provided with an acceleration data acquisition unit (123) for acquiring the acceleration data detected by an acceleration sensor (111) at every predetermined acquisition interval, an acceleration data extraction unit (125) for extracting the maximum acceleration data indicating at least the maximum acceleration and the intermediate acceleration data indicating the intermediate acceleration excluding the minimum acceleration data indicating the minimum acceleration from 3 or more acceleration data acquired sequentially, and a calculation unit (127) for executing an calculation using the extracted intermediate acceleration data.