Tire Wear Estimation via Slip Correlation
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Solution Overview
Problem
Existing tire wear monitoring systems face challenges such as sensor durability, cost, and accuracy due to direct measurement methods, and indirect estimation methods lack optimal prediction techniques, leading to unreliable tread wear predictions.
Innovation Solution
A tire wear state estimation system that uses a CAN bus system, sensors, a rolling radius estimator, acceleration slip estimator, and braking slip estimator to analyze tire slip during acceleration and braking, correlating these estimates to generate an accurate wear state of the tire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wear sensors are disposed in the tire tread for direct measurement, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent uses wheel speed sensors as intermediary devices to indirectly measure tire wear through slip ratio calculations, avoiding the need for direct wear sensors in the tire tread. The wheel speed sensors already present in the vehicle serve as mediators to obtain wear information without direct contact with the tire tread wear process.
Solution Approach 2:
The patent replaces the mechanical wear sensing system (physical sensors in tire tread) with an electronic calculation system that computes wear from wheel speed data and slip ratio formulas, substituting direct mechanical measurement with electronic computation.
2Measurement precision
If wear sensors are disposed in the tire tread for direct measurement, then measurement precision is improved, but sensor durability deteriorates due to high temperature curing and million cycles requirement
Solution Approach 1:
The patent uses wheel speed sensors as intermediary devices to indirectly measure tire wear through slip ratio calculations, avoiding the need for direct wear sensors in the tire tread. The wheel speed sensors already present in the vehicle serve as mediators to obtain wear information without direct contact with the tire tread wear process.
3Device complexity
If engine torque information is used to estimate longitudinal force, then device complexity is reduced, but measurement precision deteriorates under certain driving conditions
Solution Approach 1:
The patent applies partial action by using wheel speed data from specific wheels and calculating slip ratios only when needed (during acceleration or braking events), rather than continuously monitoring all vehicle parameters. This reduces computational complexity while maintaining sufficient accuracy for wear estimation.
Solution Approach 2:
The system uses existing wheel speed sensor data that is already being collected for other vehicle functions, making the data self-service for the wear estimation purpose without requiring additional sensors or complex torque measurement systems.
Data Source
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AI summary
A tire wear state estimation system and method is disclosed. The system comprises at least one tire supporting a vehicle; a CAN bus system disposed on the vehicle; and at least one sensor disposed on the vehicle and in electronic communication with the CAN bus system. The at least one sensor is operative to measure selected parameters associated with the vehicle and to communicate data for the selected parameters through the CAN bus system, including a first set of data, a second set of data and a third set of data. The system further comprises a rolling radius estimator operative to receive the first set of data and estimate a rolling radius for the at least one tire; an acceleration slip estimator operative to receive the second set of data and the estimated rolling radius to estimate the slip of the at least one tire during acceleration of the vehicle; a braking slip estimator operative to receive the third set of data and the estimated rolling radius to estimate the slip of the at least one tire during braking of the vehicle; and a tire slip analyzer to correlate the estimation of the slip of the at least one tire during acceleration of the vehicle and the slip of the at least one tire during braking of the vehicle and generate an estimated wear state of the at least one tire.