Modular Tyre Model for Lateral and Longitudinal Force Determination
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Solution Overview
Problem
Existing tire models face a trade-off between accuracy and computational effort, requiring a large number of parameters and measured variables to achieve desired accuracy in determining lateral and longitudinal forces transmitted by vehicle tires, which complicates user effort estimation and resulting accuracy.
Innovation Solution
A simplified tire model using basic equations with fewer parameters, incorporating vertical wheel force, slip angles, and longitudinal slip, with options for linear dependency and saturation considerations, allowing for accurate force determination with minimal parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional tire models with many parameters are used, then accuracy in determining lateral and longitudinal forces is improved, but computational effort and user complexity increase
Solution Approach 1:
The patent extracts and isolates the most critical parameters from traditional complex tire models, focusing only on vertical wheel force, slip angle, and longitudinal slip. This extraction approach maintains accuracy for force determination while eliminating unnecessary parameters that contribute to computational complexity and user burden.
Solution Approach 2:
The patent creates a simplified version of traditional tire models that replicates their essential functionality. By copying only the core relationships between vertical force, slip parameters, and lateral/longitudinal forces, the model achieves comparable accuracy with significantly reduced complexity and fewer parameters to manage.
2Measurement precision
If more parameters and measured variables are included in the tire model, then accuracy of force determination is improved, but user effort and computational resources required increase
Solution Approach 1:
The patent extracts only the essential measured variables needed for accurate force determination: vertical wheel force, slip angle, and longitudinal slip. By removing extraneous parameters and variables from traditional models, it reduces both user effort in data collection and computational time required for calculations while preserving accuracy.
Solution Approach 2:
The patent applies partial action by including only the necessary subset of parameters rather than all parameters from comprehensive tire models. This selective approach provides sufficient accuracy for driving dynamics control without the excessive computational effort and user burden associated with complete models.
3Ease of operation
If a simplified tire model with fewer parameters is used, then user effort and computational resources are reduced, but accuracy in determining lateral and longitudinal forces may deteriorate
Solution Approach 1:
The patent changes the parameter selection strategy by focusing on three critical parameters (vertical wheel force, slip angle, longitudinal slip) rather than using many parameters. This parameter change maintains accuracy by capturing the essential physics of tire forces while simplifying the model for easier operation and reduced computational resources.
Solution Approach 2:
The patent segments the tire model into distinct functional components: vertical force calculation, slip angle effects, and longitudinal slip effects. This segmentation allows each component to be modeled with minimal parameters while maintaining overall accuracy, making the model easier to operate with fewer computational resources.
Data Source
AI summary
The method involves assembling tire model in a modular manner. A multiplicative term is contained in addition to different possibilities for provision of wheel vertical force. Different possibilities for provision of slip angle-reference are provided for determination of lateral forces. Different possibilities for provision of longitudinal slip reference are provided for determination of longitudinal forces.