Tire-Mounted Acceleration Sensor Integrity via Contact Patch Signals
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Solution Overview
Problem
Existing tire pressure monitoring systems lack a reliable method to assess the integrity of tire-mounted acceleration sensors, which is crucial for ensuring the accuracy and safety of vehicle control algorithms.
Innovation Solution
A system and method for assessing the integrity of tire-mounted acceleration sensors by analyzing features extracted from acceleration signals during contact patches, using cross-correlation algorithms to determine consistency limits for contact patch width and amplitude, and comparing these features against predefined operation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tire-mounted acceleration sensors are used to extract safety-relevant information for vehicle control algorithms, then the ability to provide load and tread wear data is improved, but the risk of incorrect measurements due to sensor detachment or malfunction increases
Solution Approach 1:
The system performs preliminary integrity checks on acceleration sensors by analyzing signal features (RMS values, peak detection, spectral analysis) before the sensor data is used for safety-critical vehicle control decisions. This advance verification prevents incorrect measurements from compromising vehicle control algorithms.
Solution Approach 2:
The system continuously monitors acceleration sensor signals and provides feedback on sensor integrity status. By analyzing signal characteristics and comparing them against expected patterns, the system can detect sensor detachment or malfunction and alert the control system to disregard potentially incorrect measurements.
2Measurement precision
If acceleration sensors are mounted inside the tire to monitor contact patch characteristics, then the measurement of tire-ground interaction is improved, but the difficulty of detecting sensor integrity increases
Solution Approach 1:
The acceleration sensor serves dual purposes: it measures contact patch characteristics (load, width, length) and simultaneously provides its own integrity verification through signal analysis. The sensor's measurement signals contain inherent characteristics that reveal whether the sensor is properly mounted and functioning, eliminating the need for separate integrity monitoring systems.
Solution Approach 2:
The system analyzes changes in signal characteristics (amplitude, frequency content, temporal patterns) of the acceleration sensor output to detect integrity issues. Just as color changes indicate physical changes, variations in signal features indicate sensor detachment or malfunction, providing a detectable indicator of sensor health.
3Loss of information
If multiple features are extracted from acceleration signals to assess tire characteristics, then the quantity of safety-relevant information is improved, but the complexity of signal processing increases
Solution Approach 1:
The signal processing system divides the analysis into distinct segments: basic signal acquisition, feature extraction (RMS, peaks, spectral features), integrity verification, and application-specific processing. This segmentation allows multiple features to be extracted and analyzed independently, managing complexity while preserving all safety-relevant information.
Data Source
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AI summary
A system (100) configured for assessing the integrity of a sensor module mounted in a tire of a wheel or on an inner surface of the tire of the wheel. The system (100) comprising: a sensor module (110) configured for generating a first acceleration signal and/or a second acceleration signal; a processing module (120) configured for: determining at least two features of the first acceleration signal and/or determining at least one feature of the first acceleration signal and at least one feature of the second acceleration signal, wherein the features are characterizing a perturbation in the acceleration signal caused when a part of the tire, where the sensor module is mounted, hits the ground and forms a contact patch; verifying the consistency of the features by assessing if these features or a combination thereof meet a predefined operation characteristic.