Tire Wear Determination via Roll Radius Compensation
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Solution Overview
Problem
Existing systems for determining tire wear in wheeled motor vehicles are not simple, reliable, or robust, as they often rely on complex calculations and require additional sensors, and may fail to detect uniform tire wear across all tires.
Innovation Solution
A system comprising direct and indirect tire pressure determination units, a tire force determination unit, and a processing unit that compensates roll radius factors using tire pressure, vertical force, and temperature data to accurately calculate tire wear, with alternatives for relative and absolute roll radius analyses to account for varying tire conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing systems use complex calculations and additional sensors to determine tire wear, then measurement precision may be improved, but device complexity increases
Solution Approach 1:
The system uses existing sensors (tire pressure sensors and wheel speed sensors) that are already part of the vehicle's standard equipment to determine tire wear. The processing unit self-calibrates by comparing measured values with manufacturer specifications and adjusts parameters automatically without requiring additional sensors or complex external calibration equipment.
Solution Approach 2:
The invention extracts and utilizes data from existing sensor systems (tire pressure monitoring system and wheel speed sensor) that are already present in modern vehicles. By processing this existing data through specific algorithms, the system derives tire wear information without adding dedicated wear sensors or complex measurement apparatus.
2Ease of operation
If existing systems rely on wheel speed sensors and pressure sensors, then ease of operation is improved, but reliability of tire wear detection deteriorates due to inability to detect uniform wear
Solution Approach 1:
The processing unit continuously monitors tire pressure and wheel speed data, compares measured values with manufacturer specifications and previously stored reference data, and automatically adjusts calibration parameters. This closed-loop feedback mechanism enables the system to detect uniform tire wear across all tires by identifying systematic deviations from expected performance patterns.
Solution Approach 2:
The system performs preliminary calibration by storing manufacturer specifications and initial tire characteristics in the processing unit before actual wear monitoring begins. This pre-stored reference data enables accurate comparison and detection of wear patterns, including uniform wear across all tires, from the outset of operation.
3Measurement precision
If the system compensates roll radius factor using multiple parameters (pressure, force, temperature), then measurement precision improves, but device complexity increases
Solution Approach 1:
The system merges data from the tire pressure monitoring system, wheel speed sensor, and vertical force measurement into a unified compensation algorithm in the processing unit. By combining these existing measurement capabilities and processing them together, the system achieves accurate roll radius factor compensation without requiring separate dedicated sensors for each parameter.
Solution Approach 2:
The processing unit performs multiple functions: it processes tire pressure data, wheel speed data, vertical force measurements, and manufacturer specifications to calculate compensated roll radius factors. This multi-functional approach uses existing components for multiple purposes, avoiding the need for additional specialized equipment.
Data Source
AI summary
System for determining tire wear for tires of a wheeled motor vehicle including a direct tire pressure determination unit being configured to measure at least the tire pressure of the tires; an indirect tire pressure determination unit being configured to determine for at least some of the tires a roll radius factor corresponding to or depending from the roll radius of the respective tire; a tire force determination unit being configured to determine a vertical force factor corresponding to or depending from a vertical force applied to the tires; and a processing unit for determining the tire wear for such tires of the motor vehicle for which the indirect tire pressure determination unit provides the respective roll radius factor, namely by compensating the roll radius factor of the tires provided by the indirect tire pressure determination unit.