Tire Tread Depth Determination via Dynamic Radius and Gradient
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Solution Overview
Problem
Existing methods for determining tire tread depth during vehicle operation lack accuracy, particularly due to factors like roadway gradient, vehicle drive mode, and tire material expansion, which can lead to underestimation of tread depth and reduced reliability.
Innovation Solution
The method involves determining instantaneous rotational speed, vehicle speed, dynamic wheel radius, and dynamic inside radius, with additional consideration of roadway gradient, vehicle drive mode, and tire material expansion to improve accuracy, using sensors and correction factors to refine the tread depth calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only basic operating parameters (tire temperature, pressure, load) are used to determine dynamic inside radius, then the determination process is simple, but the tread depth determination accuracy is insufficient
Solution Approach 1:
The patent applies parameter changes by expanding the set of operating parameters from basic three (temperature, pressure, load) to six parameters total, adding roadway gradient, vehicle drive mode, and tire material expansion. This allows the dynamic inside radius determination to account for more physical factors affecting tire geometry, thereby improving tread depth measurement accuracy without fundamentally changing the measurement methodology
Solution Approach 2:
The determination process is segmented into distinct parameter groups: basic operating parameters (temperature, pressure, load) and further operating parameters (roadway gradient, drive mode, material expansion). This segmentation allows systematic incorporation of additional factors while maintaining organized data processing and enabling selective application based on measurement requirements
2Reliability
If roadway gradient, vehicle drive mode, and tire material expansion are considered, then the reliability of tread depth determination is improved, but the number of parameters to be determined increases
Solution Approach 1:
The control device is designed with multi-functionality to handle six different operating parameters through a unified determination framework. The same control device processes temperature, pressure, load, roadway gradient, drive mode, and material expansion parameters using consistent computational methods, thereby improving reliability without proportionally increasing system complexity
Solution Approach 2:
The patent determines all six operating parameters before calculating the dynamic inside radius and subsequent tread depth. By preliminarily acquiring roadway gradient, drive mode, and material expansion data along with basic parameters, the system ensures all influencing factors are accounted for in the radius calculation, improving determination reliability through comprehensive pre-assessment
Data Source
AI summary
A method for determining a tread depth of a tread of a tire during operation of a vehicle having the tire, a control device for a vehicle for determining a tread depth of a tread of a tire of the vehicle, and a system for a vehicle having such a control device and at least one electronic wheel unit, are provided. Provision is made to determine the tread depth based on a determined instantaneous dynamic wheel radius of a wheel, having the tire, of the vehicle and a determined instantaneous dynamic inside radius of the tire. In addition, at least one further first operating parameter of the tire, selected from the group including an instantaneous roadway gradient, an instantaneous vehicle drive mode and an instantaneous tire material expansion, is determined and taken into consideration.