Tire Load History Generation via Virtual Test Course
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Solution Overview
Problem
Current methods for testing tire wear, such as direct measurement of tire loads during vehicle driving and indoor wear test drums, are complex and may not accurately simulate real-world tire loads, especially in varying road conditions.
Innovation Solution
A method involving measuring vehicle accelerations and speed during a test drive to generate a virtual test course and tire load history, which is then used to simulate tire wear using a tire wear test machine, allowing for the recreation of tire loads and wear patterns without direct measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct measurement of tire loads during vehicle driving is performed, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent creates a virtual copy of the actual driving test course by processing acceleration and speed data to generate position-based course data. This virtual test course is then used in simulation software to replicate real-world tire loading conditions without requiring complex physical measurement instruments on the tire itself
Solution Approach 2:
The patent replaces direct mechanical measurement of tire loads with a computational approach. Vehicle acceleration and speed data are processed to generate virtual test course data, which is then used in computer simulation to calculate tire loads, substituting physical measurement systems with mathematical models
2Ease of operation
If indoor wear test drums are used, then ease of operation is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent makes the indoor wear test machine dynamically adjustable by incorporating mechanisms that can vary the force between the tire and rotating surface, and adjust the velocity of the rotating surface. These dynamic adjustments allow the indoor test to more accurately simulate varying real-world road conditions
Solution Approach 2:
The patent changes the operating parameters of the wear test drum by varying force and velocity to simulate different road conditions. The virtual test course data guides these parameter changes to ensure the indoor testing accurately replicates the tire loading conditions of actual driving
3Device complexity
If virtual test course generation from vehicle data is implemented, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent performs preliminary data collection during actual vehicle driving by measuring acceleration and speed. This data is then processed to create a virtual test course that captures the essential characteristics of the driving conditions, which can be reused for multiple simulation tests without requiring repeated field measurements
Solution Approach 2:
The patent introduces virtual test course data as an intermediary between actual driving conditions and tire load simulation. This intermediate representation captures the essential loading characteristics while simplifying the testing process, allowing accurate simulation without direct complex measurement
Data Source
AI summary
A method includes obtaining simulated tire data for a simulated tire, simulated vehicle data for a simulated vehicle, and simulated test course data. The simulated tire data includes data to build a basic tire model. The simulated vehicle data includes data to build a basic vehicle model. The simulated test course data includes position-based course data in a horizontal plane and position-based course data in a vertical direction. The method further includes generating a tire load history from the basic tire model, the basic vehicle model, and the simulated test course data.