Tire Acceleration Profile Segmentation for Wheel Load Determination
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Solution Overview
Problem
Existing methods for determining tire characteristic influencing variables, such as wheel load and profile depth, are inaccurate due to the influence of multiple variables on the radial acceleration profile, making it difficult to isolate and accurately determine these parameters.
Innovation Solution
A method that detects acceleration at a tire inner side measurement point during tire contact with the roadway, derives analytical characteristic variables from the acceleration profile, and uses a mathematical mapping to uniquely assign these variables to tire characteristic influencing variables, such as wheel load and profile depth, ensuring accurate determination even when multiple variables are present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the radial acceleration profile is evaluated to determine tire characteristic influencing variables, then motion state information can be obtained, but the determination accuracy deteriorates because multiple influencing variables simultaneously affect the radial acceleration profile
Solution Approach 1:
The patent segments the radial acceleration profile into distinct phases (approach phase, contact phase, departure phase) and identifies specific characteristic variables from each phase. By dividing the complex acceleration profile into manageable segments with specific evaluation criteria, the system can isolate the influence of individual tire characteristic variables while minimizing the confounding effects of other simultaneous influences, thereby improving determination accuracy
Solution Approach 2:
The patent changes the evaluation parameters by deriving multiple analytical characteristic variables from different aspects of the radial acceleration profile (amplitude, frequency, phase, duration of specific phases). This multi-parameter approach allows the system to differentiate between the effects of various tire characteristic influencing variables, enabling more accurate determination despite the presence of multiple simultaneous influences
2Quantity of substance
If multiple tire characteristic influencing variables affect the radial acceleration profile simultaneously, then comprehensive tire information is captured, but the isolation and accurate determination of individual variables becomes difficult
Solution Approach 1:
The patent divides the radial acceleration profile into distinct temporal segments (approach phase before contact, contact phase during ground interaction, departure phase after contact) and assigns specific evaluation criteria to each segment. This segmentation allows the system to capture comprehensive tire information while isolating the contribution of individual tire characteristic variables to specific phases, making it possible to determine individual variables accurately despite their simultaneous influence on the overall profile
Solution Approach 2:
The patent applies different evaluation methods and criteria to different segments of the radial acceleration profile. For example, specific phases are evaluated for amplitude characteristics while others are evaluated for duration or frequency characteristics. This local quality approach enables the system to extract specific tire characteristic information from appropriate segments, facilitating variable isolation while maintaining information completeness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for precise and reliable determination of tire characteristic influencing variables over the entire range, including during tire wear, by compensating for the influence of other variables and providing a unique assignment, enabling accurate wheel load and profile depth measurement.
Implementation Method 1
detecting a radial acceleration at the tire inner side; it is possible not only to determine a motion state of the vehicle tire but also to draw conclusions regarding tire characteristic influencing variables
Data Source
AI summary
A method is for determining a tire characteristic influencing variable and includes: a) detecting an acceleration of a measurement point on a tire inner side of a vehicle tire, wherein a deviation, caused by contact of the vehicle tire with a roadway, of the acceleration of the measurement point within an observation window is detected, b) deriving at least one analytical characteristic variable which is characteristic of the detected acceleration, wherein the at least one analytical characteristic variable characterizes the non-periodic profile of the detected acceleration within one tire rotation, c) determining at least one tire characteristic influencing variable in a manner dependent on the at least one analytical characteristic variable, wherein a mathematical mapping yields the dependency between the analytical characteristic variable and the tire characteristic influencing variable, wherein the mathematical mapping assigns at least one tire characteristic influencing variable to the at least one derived analytical characteristic variable.