Tire Drift Value Determination Using GPS Coordinates
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Solution Overview
Problem
Existing methods for determining tire drift values in vehicles, such as those used in motorbike trials, are limited by their inability to accurately measure drift angles beyond a roll of 8 degrees, which is insufficient for motorbikes cornering at greater angles, and are not suitable for various climatic conditions or track types.
Innovation Solution
A data processing method utilizing at least two GPS antennas on a vehicle to determine coordinates, roll values, and contact points with the track, allowing for the calculation of tire drift values by determining the orientation of the wheel plane and tangent to the tire trajectory, with optional inclusion of front wheel steer values and RTK technology for enhanced accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If local-frequency filtering with optical correlation is used to determine drift values, then measurement precision is improved within a limited range, but the range of roll measurement is restricted to plus or minus 8 degrees making it unsuitable for motorbikes
Solution Approach 1:
The patent changes the fundamental measurement parameters from local-frequency filtering to GPS coordinate-based calculation. By using GPS antenna coordinates and roll values to calculate contact points and trajectories, the system achieves both high measurement precision and adaptability to large roll angles exceeding 30 degrees, resolving the contradiction between precision and versatility.
2Adaptability or versatility
If GPS antennas and coordinate determination are used to calculate contact points and trajectories, then adaptability to various roll values is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical measurement systems with GPS-based electronic positioning. By substituting mechanical sensors with GPS antennas and using computational geometry to calculate contact points and trajectories, the system achieves high adaptability while reducing mechanical complexity, though electronic processing complexity increases.
3Reliability
If multiple GPS antennas are used to determine coordinates and calculate trajectories, then measurement reliability is improved for various track conditions, but loss of information increases due to data processing requirements
Solution Approach 1:
The patent extracts only the essential information needed for drift calculation from the GPS data stream. By selectively processing coordinates of GPS antennas and calculating only the necessary contact points and trajectory tangents, the system maintains high measurement reliability while minimizing information loss and processing burden.
Data Source
AI summary
A data processing method for determining the drift values of at least one tire comprising, for various positions of the vehicle on a track, determining coordinates of GPS antennas, determining values of roll of the vehicle, determining various points of contact between tire and track based on coordinates of at least one GPS antenna and based on various values of roll of the vehicle, said contact points defining a trajectory of the tire on the track; determining a tangent to the trajectory of the tire at at least one contact point, determining, based on coordinates of the GPS antenna, an orientation of a wheel plane associated with the tire, and determining a drift value based on the tangent and on the orientation of the wheel plane.