Tire Wear Estimation via Low-Speed Radius Analysis
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Solution Overview
Problem
Existing tire wear monitoring systems face challenges with sensor reliability, integration into tire tread, and data retrieval, leading to inaccurate and unreliable tire wear state measurements.
Innovation Solution
A tire wear state estimation system using vehicle-based sensors to measure distance intervals and tire revolution counts at different speeds, with a slow-speed effective radius estimator and a display for communicating wear state to operators, employing a smartphone connected via GPS and OBD-II for accurate tire wear monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wear sensors are placed in the tire tread for direct wear measurement, then measurement precision is improved, but reliability deteriorates due to sensor failure and integration difficulties
Solution Approach 1:
The patent uses vehicle-based sensors (GPS, speed sensors, revolution counters) as intermediaries to indirectly estimate tire wear through effective radius calculations, avoiding direct placement of sensors in the tire tread while still achieving accurate wear measurement
Solution Approach 2:
The patent replaces mechanical wear sensors embedded in tire tread with electronic vehicle-based sensing systems that calculate wear parameters through mathematical models based on distance, speed, and revolution data
2Reliability
If vehicle-based sensors are used to measure distance and revolution count, then reliability is improved, but measurement precision deteriorates due to tire slip at high speeds
Solution Approach 1:
The patent applies different measurement conditions to different operational scenarios by selecting only low-speed intervals where slip is minimal, ensuring high measurement precision when the vehicle is traveling below a threshold speed
Solution Approach 2:
The patent changes the operational parameter threshold by filtering data based on vehicle speed, using only measurements taken when speed is below a predetermined threshold to minimize slip effects and improve estimation accuracy
Data Source
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AI summary
A tire wear state estimation system is disclosed. The system comprises a tire (12, 14, 16, 18) supporting a vehicle (10); a vehicle-based sensor (20) for measuring a plurality of distance intervals travelled by the tire (12, 14, 16, 18) during vehicle operation at different vehicle speeds; a vehicle-based tire revolution counter for counting a tire revolution count within each of the plurality of distance intervals; a vehicle-based speed sensor for determining the vehicle ground speed during the plurality of distance intervals travelled by the tire (12, 14, 16, 18); a slow-speed interval selector operative to select at least one slow-speed distance interval from the plurality of distance intervals operatively based on the vehicle (10) travelling at a ground speed less than a pre-selected threshold level; an effective radius estimator for estimating a slow-speed effective radius of the tire (12, 14, 16, 18) during the at least one slow-speed distance interval from the tire revolution count and the distance travelled by the tire during the at least one slow-speed distance interval; and a tire wear-state estimator operative to estimate a tire wear-state from the estimated slow-speed effective radius of the tire (12, 14, 16, 18) during the at least one slow-speed distance interval.