TPMS Alarm Thresholding Based on Wheel Load and Tire Vibration
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Solution Overview
Problem
Conventional tire pressure monitoring systems (TPMS) fail to accurately determine tire pressure decreases due to fixed alarm thresholds that do not account for variations in wheel load caused by passengers or cargo, leading to potential safety issues.
Innovation Solution
A TPMS that includes a tire side device with a vibration detection unit, air pressure detection unit, and data acquisition unit to calculate wheel load data, which is transmitted to a vehicle side device to set dynamic alarm thresholds based on wheel load, enabling accurate detection of tire pressure decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed alarm threshold is used for tire pressure monitoring, then the system is simple to operate, but the accuracy of determining tire pressure decreases is compromised due to variations in wheel load
Solution Approach 1:
The alarm threshold is changed from a fixed value to a dynamic value that automatically adjusts based on the detected wheel load. The system calculates the appropriate threshold by multiplying the wheel load by a predetermined coefficient, enabling the threshold to adapt to varying loading conditions while maintaining detection accuracy
Solution Approach 2:
The system incorporates a feedback mechanism where the vibration detection unit continuously monitors wheel load, and this information is fed back to automatically adjust the alarm threshold. This closed-loop control ensures the threshold always corresponds to the current wheel load condition, improving detection accuracy without requiring manual intervention
2Measurement precision
If wheel load data is acquired and used to set dynamic alarm thresholds, then the accuracy of tire pressure monitoring is improved, but the device complexity increases
Solution Approach 1:
The vibration detection unit serves multiple functions: it detects both wheel load information and tire pressure information. By utilizing the same sensor for dual purposes, the system avoids adding extra hardware complexity while achieving accurate tire pressure monitoring through wheel load-based threshold adjustment
Solution Approach 2:
The system changes the operational parameter of the alarm threshold from a constant value to a variable value that changes according to wheel load conditions. This parameter transformation enables the system to maintain high detection accuracy across different loading scenarios without requiring multiple fixed thresholds or complex lookup tables
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 solution allows for precise determination of tire pressure decreases by adjusting alarm thresholds according to wheel load, enhancing safety by providing accurate alerts.
Implementation Method 1
a vibration detection unit that outputs a detection signal according to a magnitude of vibration of a tire
Implementation Method 2
an air pressure detection unit that detects the tire pressure, which is the pressure inside the tire
Data Source
AI summary
A tire side device includes a vibration detection unit that outputs a detection signal according to a magnitude of vibration of a tire, an air pressure detection unit that detects the tire pressure, a data acquisition unit that calculates a contact length of the tire with a road surface based on the detection signal and acquires a wheel load data that is a data related to the wheel load based on the contact length, and a data transmission unit that transmits a data related to the tire pressure and the wheel load data. A vehicle side device includes a receiving unit that receives data on tire pressure and wheel load data, a threshold setting unit that sets an alarm threshold for tire pressure based on the wheel load data, and an alarm determination unit that determines that the tire pressure has decreased when the tire pressure indicated by the data on the tire pressure decreases below the alarm threshold.