Tire Testing System Dynamic Slip Control
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Solution Overview
Problem
Current tire testing machines are inadequate for simulating dynamic rollover events and racing conditions, lacking sufficient slip angles, steer rates, and dynamic loading capabilities, which are essential for meeting regulatory requirements and replicating real-world tire performance under various environmental conditions.
Innovation Solution
A tire testing system with a carriage assembly constrained in five degrees of freedom, coupled to rails with dedicated actuators for each degree of motion, allowing for precise simulation of vehicle motions and environmental conditions, including high-speed testing and varied terrain, using a railed system that emulates real road surfaces and includes Hardware-in-the-Loop capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current tire testing machines are used, then basic tire performance can be measured, but they cannot simulate dynamic rollover events and racing conditions due to insufficient slip angles, steer rates, and dynamic loading capabilities
Solution Approach 1:
The testing system transitions from static to dynamic measurement capabilities by implementing real-time data acquisition systems that capture tire forces, moments, and operational parameters during actual driving maneuvers including dynamic rollover events and racing conditions. The system uses dynamic load cells and force sensors that can measure rapidly changing forces during extreme steering and rolling conditions.
Solution Approach 2:
The system adds new measurement dimensions by incorporating sensors that capture roll angle, steer rate, and dynamic loading parameters that were previously unmeasured. The data acquisition system collects multi-dimensional data including lateral forces, longitudinal forces, vertical loads, and their rates of change, enabling comprehensive simulation of real-world driving scenarios.
2Reliability
If multiple prototype vehicles are built for testing to meet FMVSS-126 criteria, then comprehensive safety testing can be performed, but the process becomes extremely expensive
Solution Approach 1:
The system creates a virtual copy of vehicle behavior through detailed data collection from instrumented vehicles. By capturing comprehensive tire force and moment data during actual driving, the system enables simulation-based testing that replicates vehicle performance without requiring multiple physical prototypes. The data serves as a digital twin for virtual testing and validation.
Solution Approach 2:
The system replaces mechanical prototyping with computational simulation. Instead of building and physically testing multiple vehicle prototypes, the system uses sensor data to create computational models that simulate vehicle behavior under various conditions including electronic stability control scenarios, thereby substituting expensive mechanical iteration with efficient computational analysis.
3Speed
If conventional tire testing machines are used, then standard tire performance can be evaluated, but they lack the capability to generate sufficient longitudinal loads and speeds for racing conditions
Solution Approach 1:
The system changes the operational parameters of the testing machine to accommodate racing conditions by extending the speed range to match actual racing velocities and increasing the load cell capacity to measure extreme longitudinal forces during hard braking and acceleration. The data acquisition system is configured to capture high-frequency data at these elevated parameter levels.
Data Source
AI summary
Systems and methods, including: one of a simulated road surface and an actual road surface; a test tire physically contacting the one of the simulated road surface and the actual road surface; and a plurality of gears linking the test tire and the one of the simulated road surface and the actual road surface, such that the velocities of the test tire and the one of the simulated road surface and the actual road surface are linked and an associated slip ratio between the test tire and the one of the simulated road surface and the actual road surface is controlled. The simulated road surface includes one of a drum, a belt, a drive wheel, and a rail. The plurality of gears are varied in terms of gear ratio using a controller such that slip ratio is dynamically controlled and varied.


