Tire Wear Evaluation Using Low-Speed Movement Detection
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Solution Overview
Problem
Existing methods for determining tire wear values fail to account for tire wear caused by movements unrelated to the tire's rotational direction, such as those occurring during parking, leading to inaccurate wear assessments.
Innovation Solution
A method that involves determining a vehicle's driving speed, comparing it to a threshold speed, detecting tire movements, and assigning further wear values based on these movements, especially when the speed is below the threshold, using sensors and an evaluation device to calculate a more precise wear value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only rotational tire movements are considered for wear determination, then the measurement process is simple, but the wear value accuracy deteriorates due to missing non-rotational wear events
Solution Approach 1:
The patent transitions from a static wear measurement approach (only considering rotational movements) to a dynamic approach that adapts to different vehicle operating states. By detecting vehicle speed and comparing it to a threshold, the system dynamically adjusts which wear events are recorded - including both rotational wear during normal driving and non-rotational wear during parking maneuvers when speed is below the threshold.
Solution Approach 2:
The patent adds a new dimension to wear measurement by considering not only the rotational movement of the tire but also the steering angle and vehicle speed dimensions. This multi-dimensional approach allows the system to detect and record non-rotational wear events that occur when the tire is turned during parking, complementing the traditional rotational wear measurement.
2Reliability
If traditional wear determination methods are used, then the device complexity is low, but the reliability of wear value determination deteriorates due to unaccounted parking wear
Solution Approach 1:
The patent implements a feedback mechanism where the evaluation device continuously monitors vehicle speed and steering angle, compares the speed to a threshold, and automatically adjusts which wear events are recorded based on the current operating state. This feedback loop ensures that non-rotational wear during parking is captured while avoiding false recordings during normal driving, thereby improving the reliability of wear value determination.
Solution Approach 2:
The patent introduces an intermediary evaluation device that acts as a mediator between the raw sensor data (speed, steering angle) and the final wear value determination. This intermediary processes the data, applies the speed threshold logic, and determines whether to record wear events, thereby improving reliability without requiring complex changes to the entire system.
3Measurement precision
If all tire movements are recorded regardless of vehicle speed, then no wear events are missed, but false wear recordings increase due to normal rotational movements being misclassified
Solution Approach 1:
The patent applies preliminary filtering by comparing vehicle speed to a threshold before recording wear events. This preliminary action prevents false wear recordings from normal rotational movements during driving by only recording events that occur when the vehicle is stationary or moving very slowly (below the threshold speed), thereby reducing processing energy for false recordings while maintaining accurate wear event detection.
Data Source
Figure 1~3
AI summary
The invention relates to a method for determining the wear value of a tire (2) of a vehicle (1), comprising one of the following steps: - providing a vehicle (1), wherein the vehicle (1) has at least one tire (2); - providing an evaluation device (4), wherein the evaluation device (4) is designed to determine the wear value of the at least one tire (2) as a function of a physical measurement; - determining the wear value of the at least one tire (2) as a function of the physical measurement using the evaluation device (4); - determining a driving speed of the vehicle (1); - comparing the driving speed with a threshold speed; - detecting a movement of the at least one tire (2), wherein a further wear value of the at least one tire (2) is assigned to the movement;- Determining a more precise abrasion value using the evaluation device (4) as a function of the abrasion value and the further abrasion value in the case after the driving speed reaches or falls below the threshold speed.;