Tire Decompression Detection Using Wheel Speed Thresholds
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Solution Overview
Problem
Conventional methods for detecting tire decompression are inaccurate, particularly when multiple tires decompress simultaneously, leading to increased rolling resistance, mileage deterioration, and potential tire bursts, especially on slopes and during changes in load distribution.
Innovation Solution
A method and device that detect tire decompression by calculating the rotational speed of each wheel, determining the vehicle's ground speed, and comparing this information with a basis value set at prescribed inner pressure, using GPS signals and thresholds to accurately judge decompression across all tires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods compare wheel speeds relatively or with GPS speed, then decompression detection is possible, but accuracy deteriorates when multiple tires decompress simultaneously or on slopes
Solution Approach 1:
The invention changes the detection parameter from relative wheel speed comparison to absolute wheel speed comparison against a predetermined threshold value. This allows accurate detection of decompression in one or multiple tires simultaneously, regardless of slope conditions or load distribution changes, by comparing each wheel's speed against an independently determined threshold rather than against other wheels' speeds.
Solution Approach 2:
The invention segments the decompression detection process by evaluating each wheel independently against its own threshold value, rather than evaluating wheels collectively through relative comparison. This segmentation allows simultaneous decompression of multiple wheels to be detected accurately, as each wheel's condition is assessed separately against the predetermined threshold.
2Productivity
If wheel speed comparison methods are used, then decompression detection is achieved, but false judgments occur due to slope effects and load distribution changes
Solution Approach 1:
The invention changes from relative speed comparison to absolute speed threshold comparison, where each wheel's speed is compared against a predetermined threshold that accounts for slope and load conditions. This eliminates false judgments caused by slope effects and load distribution changes, as the threshold is independently determined rather than derived from other wheel speeds.
Solution Approach 2:
The invention introduces a predetermined threshold value as an intermediary reference for decompression judgment. This threshold acts as a mediator that decouples the detection process from direct wheel-to-wheel comparison, thereby eliminating the influence of slope conditions and load distribution variations that cause false judgments in conventional methods.
3Device complexity
If diagonal wheel speed comparison is used, then simple detection is possible, but simultaneous decompression of multiple tires cannot be judged
Solution Approach 1:
The invention segments the detection process by independently evaluating each wheel against a predetermined threshold, rather than comparing wheels in diagonal pairs. This segmentation enables detection of simultaneous decompression in multiple wheels while maintaining computational simplicity, as each wheel's condition is assessed independently without complex inter-wheel comparisons.
Solution Approach 2:
The invention changes from relative comparison parameters to absolute threshold parameters, allowing each wheel to be evaluated independently. This parameter change enables reliable detection of simultaneous multi-tire decompression while keeping the detection method simple, as each wheel is compared against a fixed threshold rather than against other wheels' speeds.
Data Source
AI summary
A method for detecting decompression of tires based on the rotational speed of wheels mounted on a vehicle, comprising the steps of: detecting the rotational speed of each of the above-mentioned wheels, determining the speed against ground of the vehicle, calculating the speed information of a fixed wheel from the rotational speeds of said wheels, calculating the judgment value of the wheel position by comparing the speed information of the wheels with the speed against ground of the vehicle, comparing the judgment value of the wheel position with the basis value of the wheel position obtained by preliminarily comparing the speed against ground of the vehicle with the speed information of the wheels at prescribed inner pressure, and judging decompression of tires based on relation between the comparison value of the basis value with the judgment value and a fixed threshold. A region of judging decompression of tires can be broadened and the accuracy of reduced pressure judgment can be improved.