Tire Pressure Monitoring with Pressure-Adjustment Correction
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Solution Overview
Problem
Conventional Tire Pressure Monitoring Systems (TPMS) struggle to detect slow punctures effectively, as the slow reduction in air pressure can be masked by tire pressure adjustments, leading to potential tire bursts if unattended.
Innovation Solution
An air pressure monitoring apparatus with an air pressure acquisition unit, pressure-adjustment determination unit, and determination unit that corrects air pressure data based on temperature and adjusts for changes due to pressure adjustments, enabling accurate detection of slow punctures by analyzing time-course changes and reduction rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional TPMS compares current tire pressure data with past data using a fixed threshold, then usual pressure reductions can be detected, but slow punctures are missed when pressure adjustments occur between detections
Solution Approach 1:
The system performs preliminary detection of pressure adjustment events by comparing consecutive pressure measurements. When a pressure adjustment is detected, the system proactively corrects historical pressure data before conducting slow puncture detection, ensuring accurate baseline comparison for subsequent measurements.
Solution Approach 2:
The system dynamically changes the detection threshold from a fixed predetermined value to a variable threshold that adapts based on detected pressure adjustment events. When adjustments are detected, the system modifies how pressure differences are calculated and evaluated, allowing accurate slow puncture detection despite intervening pressure changes.
2Reliability
If the detection threshold is set to detect slow pressure reductions, then slow punctures can be detected, but normal pressure adjustments are falsely identified as slow punctures
Solution Approach 1:
The system uses feedback from consecutive pressure measurements to detect pressure adjustment events. When a significant pressure change is detected between consecutive measurements, the system feeds this information back into the detection algorithm to adjust subsequent evaluations, preventing false positives while maintaining slow puncture detection sensitivity.
Solution Approach 2:
The detection system transitions from a static fixed-threshold approach to a dynamic adaptive approach. The system continuously monitors pressure changes, detects adjustment events, and dynamically modifies its detection behavior based on the detected events, allowing it to distinguish between intentional adjustments and actual slow punctures.
3Device complexity
If pressure adjustment events are not accounted for in the detection algorithm, then the system remains simple, but accurate slow puncture detection becomes impossible when adjustments occur
Solution Approach 1:
The detection process is segmented into distinct phases: normal operation mode with fixed threshold comparison, and adjustment correction mode triggered when pressure adjustments are detected. This segmentation allows the system to maintain simplicity during normal operation while enabling accurate detection when adjustments occur, without requiring complex algorithms to run continuously.
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 early and accurate detection of slow punctures, preventing potential tire bursts by differentiating between slow pressure reductions and adjustments, thereby enhancing safety and ride comfort.
Implementation Method 1
an air pressure sensor that detects a pressure reduction in the tire
Implementation Method 2
a temperature sensor that detects a temperature in the tire
Data Source
AI summary
An air pressure monitoring apparatus includes an air pressure acquisition unit, a pressure-adjustment determination unit, and a determination unit. The air pressure acquisition unit acquires data on the air pressure in a tire attached to a vehicle. The pressure-adjustment determination unit determines whether the air pressure in the tire has been adjusted. The determination unit determines whether the tire has a slow puncture based on time-course changes in the data on the air pressure. When the pressure-adjustment determination unit has determined that the air pressure in the tire has been adjusted, the determination unit corrects lastly acquired data on the air pressure and determines whether the tire has a slow puncture based on the corrected data on the air pressure.