Tire Pressure Detection Using GPS Speed and Rotational Data
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Solution Overview
Problem
Existing methods for detecting a decrease in tire inner pressure using GPS information and tire rotational speed are inaccurate due to the inability to exclude changes in rotational speed caused by vehicle running states, leading to unreliable dynamic load radius calculations.
Innovation Solution
A method that calculates accurate dynamic load radii by comparing GPS speed information with tire rotational speed data, ensuring stable measurements only when the vehicle is running straight and at a constant speed, and using initial values stored at normal pressure to judge pressure decreases, while excluding ineffective data and utilizing statistical means for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If tire pressure detection is performed using GPS speed and rotational speed comparison, then detection capability is provided, but measurement precision deteriorates due to inability to exclude running state influences
Solution Approach 1:
The system performs preliminary classification of running states (straight/curved, flat/sloped, constant speed/accelerating) before conducting tire pressure detection. This preliminary action filters out measurement data collected during unsuitable running states, ensuring that only data from appropriate conditions are used for pressure detection, thereby maintaining high measurement precision.
Solution Approach 2:
The detection process is segmented into distinct phases: running state classification, data collection during classified states, and pressure detection based on collected data. This segmentation allows the system to handle different running conditions separately and select only the most suitable data for accurate pressure measurement.
2Difficulty of detecting and measuring
If dynamic load radius is calculated from GPS speed and tire rotational speed, then tire pressure can be detected, but reliability deteriorates due to false alarms from running state variations
Solution Approach 1:
Before calculating dynamic load radius, the system preliminarily classifies the running state and determines whether current conditions are suitable for measurement. This preliminary action prevents calculations during unsuitable conditions, thereby reducing false alarms and improving reliability.
Solution Approach 2:
The system continuously monitors running state and provides feedback to adjust the measurement process. When running state changes make measurement unsuitable, the system adjusts by selecting alternative data or pausing detection, ensuring reliable results throughout varying conditions.
3Productivity
If tire pressure detection is performed without excluding running state influences, then detection can be performed continuously, but manufacturing precision deteriorates due to inaccurate dynamic load radius values
Solution Approach 1:
The system performs preliminary classification of each measurement opportunity based on running state. This allows continuous detection attempts while ensuring that only measurements from suitable conditions are processed, maintaining both continuity and precision.
Solution Approach 2:
The system dynamically adjusts the measurement process based on real-time running state classification. When conditions are unsuitable, the system temporarily suspends or adjusts measurements; when conditions improve, it resumes or enhances measurement activity, maintaining both continuity and accuracy.
Data Source
AI summary
Provided is a method for detecting decrease in an inner pressure of a tire with excellent accuracy by calculating accurate dynamic load radii by comparing the GPS speed information with tire rotational speed information collecting data only when a stable measurement of the dynamic load radii is possible, as well as by utilizing GPS positioning information for a running state of a vehicle, and an apparatus and a program thereof.The present invention is characterized in judging decrease in an inner pressure of a tire from change in size of dynamic load radii by comparing an effective dynamic load radius with an initial value preliminarily stored as a dynamic load radius at a normal inner pressure, wherein the effective dynamic load radius is obtained by calculating an apparent dynamic load radius of a tire at running by successively comparing a calculated speed of a vehicle by a GPS device, in which the speed of the vehicle at running is calculated from information obtained by the GPS device, with a rotational speed of the tire obtained by a tire rotational speed detection apparatus installed on tire rotational portions of four wheels of the vehicle, and judging the apparent dynamic load radius to be effective only when a running state is judged to be straight on a flat road at a constant speed from GPS positioning information.