Tire Tread Depth Determination via Dynamic Radius Correction
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Solution Overview
Problem
Existing methods for determining tire tread depth during vehicle operation provide only an approximation, as they rely on the difference between dynamic wheel and inside radii, which deviate from geometric radii, leading to inaccuracies, especially under varying tire operation conditions.
Innovation Solution
A method that calculates tread depth by considering a correction variable specific to the tire type, characterizing the relationship between changes in dynamic radii and tread depth, using data from sensors measuring rotational speed, vehicle speed, tire temperature, pressure, and load, and storing initial tread depth for accurate determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the tread depth is determined as the difference between dynamic wheel radius and dynamic inside radius, then the determination can be performed during vehicle operation using available sensor data, but the accuracy of the determination is reduced due to deviation from geometric radii
Solution Approach 1:
The patent introduces a correction variable as an intermediary element that mediates between the dynamically determined radius difference and the actual geometric tread depth. This correction variable, determined beforehand for each tire type, accounts for the systematic deviation between dynamic and geometric radii, thereby improving measurement accuracy while maintaining the ability to perform determination during vehicle operation
Solution Approach 2:
The correction variable is determined beforehand for each tire type through preliminary measurements or calculations. This preliminary action allows the system to compensate for inherent deviations between dynamic and geometric radii before actual tread depth determination during vehicle operation, thus improving accuracy without compromising operational capability
Data Source
AI summary
A method for determining a tread depth of a tread of a tire during operation of a vehicle comprising the tire, a controller for a vehicle for determining a tread depth of a tread of a tire of the vehicle, and a system for a vehicle, comprising such a controller and at least one electronic wheel unit, wherein there is provision to determine the tread depth based on a determined instantaneous dynamic wheel radius of a wheel, comprising the tire, of the vehicle and a determined instantaneous dynamic inside radius of the tire are disclosed. To improve the accuracy of determination of the tread depth a correction variable predetermined for the type of tire is taken into consideration, which correction variable characterizes the relationship between a change in the tread depth, and a change resulting therefrom in the difference between the dynamic wheel radius and the dynamic inside radius.