Tire Pressure Detection Using Temperature-Corrected Speed Indexes
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Solution Overview
Problem
Existing tire pressure monitoring systems fail to accurately detect decreased tire pressure due to variations in external temperature, as the correlation between tire pressure rate and pressure index values changes with temperature, leading to potential missed detections.
Innovation Solution
An apparatus and method that include a speed acquisition unit, outside air temperature acquisition unit, decreased pressure index calculation unit, correction unit, and determination unit, which calculate corrected pressure indexes or threshold values based on external temperature to ensure accurate detection of decreased tire pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If decreased pressure threshold values are set based on data from test runs at a certain external temperature, then the detection system works accurately under those specific temperature conditions, but the detection accuracy deteriorates when the external temperature varies from the test conditions
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the decreased pressure threshold values based on external temperature. The correction unit calculates corrected threshold values using a predetermined correction formula that incorporates temperature as a variable parameter, allowing the system to adapt to different temperature conditions while maintaining accurate decreased pressure detection
Solution Approach 2:
The system implements feedback by continuously monitoring external temperature and using this information to adjust the decreased pressure threshold values. The correction unit receives temperature input and feeds back corrected threshold values to the determination unit, creating a closed-loop system that maintains detection accuracy across varying temperature conditions
2Device complexity
If the decreased pressure index values are used directly without temperature correction, then the detection system is simple and quick to implement, but false detections or missed detections occur due to temperature variations
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction formulas or correction values that account for temperature effects. The correction unit uses these predetermined corrections to adjust threshold values before comparison with decreased pressure index values, preventing false or missed detections while maintaining system simplicity
Solution Approach 2:
The correction unit acts as an intermediary between the decreased pressure index calculation unit and the determination unit. It receives raw index values and temperature data, applies temperature-based corrections, and outputs corrected values for final determination, thereby improving reliability without significantly increasing overall system complexity
Data Source
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AI summary
An apparatus for detecting decreased pressure of tire includes a speed acquisition unit, an outside air temperature acquisition unit, a decreased pressure index calculation unit, a correction unit, and a decreased pressure determination unit. The speed acquisition unit acquires rotation speeds of a plurality of tires mounted to a vehicle. The outside air temperature acquisition unit acquires an external temperature around the vehicle. The decreased pressure index calculation unit calculates at least one decreased pressure index as an index for comparing the rotation speeds of the plurality of tires. The correction unit calculates a corrected decreased pressure index corrected in consideration of influence of the external temperature, or calculates a corrected decreased pressure threshold value corrected in consideration of influence of the external temperature. The decreased pressure determination unit determines whether or not at least one tire among the plurality of tires has a decreased pressure.