Tire Longitudinal Interaction Parameter Determination
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Solution Overview
Problem
Existing methods for determining longitudinal interactions between a vehicle tire and the ground are complex and require significant hardware-software resources, making them unreliable and inefficient for real-time monitoring, especially in risky driving conditions.
Innovation Solution
A method and apparatus that simplify the determination of longitudinal interactions by using radial deformation indices, such as radial deformation, rate of radial deformation, and acceleration of radial deformation, correlated with the angular velocity of the tire, to calculate a main parameter representative of the interaction, using a linear combination and ratio-based algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex systems with multiple sensors and neural networks are used to determine longitudinal forces, then measurement reliability may improve, but device complexity and resource requirements increase significantly
Solution Approach 1:
The patent extracts only the essential information needed for determining longitudinal forces - specifically radial deformation at the footprint area boundaries - while discarding unnecessary complex processing systems. This is achieved by focusing measurement on critical deformation points rather than using multiple sensors and neural networks, thereby reducing device complexity while maintaining measurement reliability
Solution Approach 2:
The patent uses a simplified measurement approach that copies only the essential deformation characteristics at key locations (footprint boundaries) rather than attempting to measure all force parameters directly. This selective copying of critical deformation information reduces the need for complex hardware while preserving the ability to determine longitudinal forces accurately
2Measurement precision
If multiple variables and high calculation capacity are used to calculate longitudinal force, then calculation accuracy may improve, but processing complexity and resource requirements increase
Solution Approach 1:
The patent extracts only the critical deformation parameters at the footprint area boundaries and uses these simplified measurements to determine longitudinal forces. By taking out only the essential deformation information rather than processing multiple variables through neural networks, the system achieves adequate calculation accuracy with significantly reduced processing complexity
Solution Approach 2:
Instead of directly measuring multiple force parameters and calculating longitudinal force from them, the patent inverts the approach by measuring radial deformation at boundary points and deriving force information from these simplified measurements. This inversion reduces the number of variables needed while maintaining the ability to determine longitudinal forces accurately
3Device complexity
If detection of two radially close markers is used to determine longitudinal force, then system simplicity may improve, but measurement precision deteriorates due to required high detection accuracy
Solution Approach 1:
The patent applies local quality by focusing measurement on specific critical locations - the boundaries of the footprint area - rather than using multiple closely-spaced markers. By concentrating measurement resources on these key locations where deformation provides maximum information about longitudinal forces, the system achieves adequate precision with simpler detection requirements
Solution Approach 2:
The patent transitions from measuring radial positions of multiple markers to measuring radial deformation at boundary points. This dimensional change in the measurement approach - from position-based to deformation-based measurement at critical locations - reduces the stringency of detection accuracy requirements while maintaining system simplicity
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 reliable and efficient determination of longitudinal interactions, reducing complexity and resource requirements, enabling better friction evaluation and automatic vehicle control during critical driving situations.
Implementation Method 1
a sensor (6) to detect a detection magnitude representative of a radial deformation of said tyre and to generate a corresponding main signal (100)
Data Source
AI summary
A method of determining at least one parameter representative of at least one interaction along a longitudinal direction between a tyre and the ground, includes identifying a first parameter representative of a radial deformation of the tyre; determining a first and a second value of the first parameter in respective neighbourhoods of a first and a second longitudinal end of a footprint area defined between the tyre and ground; calculating a linear combination of the values thereby obtaining a second parameter; determining a third parameter representative of an angular velocity of the tyre; calculating a ratio between the second and third parameters; and calculating a main parameter, starting from the ratio, according to an algorithm, which main parameter is representative of a longitudinal interaction between the tyre and the ground.