Tire Pressure Loss Detection Using Cross-Tire Rate Comparison
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Solution Overview
Problem
Current methods for detecting tire pressure loss events, such as punctures, often fail to provide early warnings, leading to delayed driver action, or result in false positives due to the reliance on fixed threshold comparisons.
Innovation Solution
A method that uses real-time tire pressure data from multiple tire-mounted sensors to calculate and compare pressure change rates, identifying anomalous changes by referencing the rates of other tires on the same vehicle, thereby detecting pressure loss events more quickly and reliably.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed threshold value is used to detect pressure loss events, then the detection method is simple to implement, but the detection timing is delayed and false positives occur
Solution Approach 1:
The patent changes the detection parameter from absolute pressure values to pressure change rates (derivatives). By monitoring how quickly pressure changes rather than just the pressure level itself, the system can detect anomalies earlier and more accurately without requiring complex multi-sensor setups. This parameter transformation resolves the contradiction by improving detection reliability while maintaining implementation simplicity.
Solution Approach 2:
Instead of comparing each tire's pressure against a fixed threshold, the patent inverts the approach by comparing pressure change rates across multiple tires relative to each other. This relative comparison method identifies anomalies by detecting when a tire's pressure behavior diverges from the norm, achieving higher accuracy without increasing system complexity.
2Loss of time
If a higher threshold value is set to provide earlier warning, then the detection timing is improved, but the likelihood of false positives increases
Solution Approach 1:
By transforming the detection parameter to pressure change rate, the system achieves early detection without raising arbitrary threshold values. The derivative-based detection naturally identifies rapid pressure changes that indicate actual problems, filtering out gradual environmental variations that would trigger false positives in absolute pressure monitoring.
Solution Approach 2:
The system uses feedback from multiple tires to establish normal pressure change patterns. By continuously monitoring all tires and comparing their behavior, the system learns what constitutes normal operation and can distinguish actual anomalies from environmental variations, reducing false positives while maintaining early detection capability.
3Reliability
If multiple tires are monitored and compared, then the reliability of detection is improved, but the device complexity increases
Solution Approach 1:
The patent makes each tire pressure sensor multi-functional: they not only monitor their own pressure but also serve as reference points for detecting anomalies in other tires. This universal approach allows the system to use existing sensors for both absolute monitoring and relative comparison, improving reliability without adding hardware complexity.
Solution Approach 2:
The system merges the detection functions by combining data from all tires into a unified analysis framework. Instead of treating each tire independently, the patent combines their pressure change rate data to establish a collective baseline, allowing anomalies to be detected through their deviation from the group behavior, thereby improving reliability through data integration rather than hardware multiplication.
Data Source
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AI summary
A method of detecting a pressure loss event in a vehicle tire being assessed, comprising: obtaining real-time tire pressure data from a plurality of tire-mounted sensors (TMS) each mounted in one of a plurality of tires, including the tire being assessed, on the same vehicle; calculating a pressure change rate over a fixed length time window for each of the plurality of tires on the vehicle: comparing the pressure change rate of the tire being assessed to one or more of the pressure change rates of the other tires in the plurality of tires on the vehicle; determining, from the comparison, whether the tire being assessed has an anomalous pressure change rate which may be indicative of a pressure loss event in said tire.