Tire Wear Detection Using Natural-Frequency Vibration Analysis
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Solution Overview
Problem
Existing tire wear detection systems face challenges in accurately detecting tire wear due to disturbances from rough road surfaces, which can reduce detection accuracy and require precise extraction of acceleration waveforms in step-in and kick-out regions.
Innovation Solution
A tire wear detection apparatus comprising a tire side device with a vibration detection unit, vehicle speed estimation unit, signal processing unit, and data communication unit, which generates wear data by calculating vibration levels within specific frequency ranges based on natural frequencies of the tire, allowing for accurate tire wear state determination without relying on precise extraction of acceleration waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acceleration waveform extraction in step-in and kick-out regions is used for tire wear detection, then tire wear state can be detected, but detection accuracy is reduced due to road surface disturbances
Solution Approach 1:
The patent extracts only the relevant vibration components within the natural frequency range of the tire from the overall acceleration signal. By applying frequency decomposition (FFT) and filtering to isolate vibrations at the tire's natural frequency, the system separates useful wear-related information from harmful road surface disturbances occurring at different frequencies.
Solution Approach 2:
The patent utilizes the natural vibration characteristics of the tire as the detection mechanism. By monitoring vibrations at the tire's natural frequency range (typically 10-100 Hz), the system detects wear-related changes in vibration amplitude and frequency, which are less affected by road surface disturbances compared to impact-based methods.
2Measurement precision
If step-in and kick-out region extraction is used, then tire wear can be detected, but the system requires precise waveform extraction which increases complexity
Solution Approach 1:
The system continuously monitors tire vibrations at the natural frequency range throughout the entire rotation cycle, rather than attempting to precisely identify and extract specific step-in and kick-out regions. This approach simplifies signal processing by using overall vibration characteristics that are easier to capture and analyze.
Solution Approach 2:
The patent implements continuous vibration monitoring during tire rotation, collecting data throughout the entire rotation cycle rather than only during specific regions. This continuous measurement approach provides more data points for accurate wear detection while simplifying the identification of critical measurement regions.
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
The system effectively detects tire wear by analyzing vibration levels within specific frequency ranges, reducing the impact of road surface disturbances and improving accuracy, enabling timely tire replacement and enhancing vehicle safety.
Implementation Method 1
a vibration detection unit configured to output a detection signal according to a magnitude of vibration of a corresponding tire
Implementation Method 2
calculate, as the wear data, a level value of a vibration level of the acquired detection signal within a predetermined frequency range that is based on a natural frequency of the corresponding tire
Data Source
AI summary
A tire wear detection apparatus includes a tire side device and a vehicle body side system. The tire side device includes a vibration detection unit, a vehicle speed estimation unit, a signal processing unit, and a first data communication unit. The vibration detection unit is configured to output a detection signal. The vehicle speed estimation unit is configured to estimate the vehicle speed. The signal processing unit is configured to generate wear data. The vehicle body side system includes a second data communication unit and a controller. The controller has a wear determination unit configured to determine a tire wear state based on the wear data. The signal processing unit is configured to acquire the detection signal within a detection signal acquiring range, and calculate a level value of a vibration level of the acquired detection signal within a predetermined frequency range based on a natural frequency of the tire.