Tire Cornering Angle Determination via Lateral Acceleration
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Solution Overview
Problem
Existing methods fail to accurately and reliably determine the cornering angle of a tire during vehicle operation, which is crucial for vehicle stability and control, as the tire's deformation and steering angle measurements are not directly correlated.
Innovation Solution
A method and system that measure lateral and radial accelerations of the tire to calculate the cornering angle, using sensors placed at specific distances from the tire's equatorial plane, with data sampling at high frequencies and low-pass filtering, to derive the cornering angle from characteristic curves and fit equations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If steering angle is measured on the vehicle, then steering input is obtained, but the actual cornering angle of the tyre cannot be accurately determined due to tyre deformation
Solution Approach 1:
The patent replaces mechanical steering angle measurement with a sensor-based measurement system that directly measures the tyre's cornering angle through acceleration sensors mounted on the wheel rim, eliminating the indirect inference from steering input that is compromised by tyre deformation
Solution Approach 2:
The patent introduces acceleration sensors as intermediary devices that measure the tyre's actual motion and deformation, providing a direct measurement of cornering angle that accounts for tyre flexibility and deformation during steering maneuvers
2Measurement precision
If acceleration sensors are mounted on the wheel rim, then cornering angle can be measured, but device complexity increases
Solution Approach 1:
The patent makes the acceleration sensors serve multiple functions: measuring cornering angle, determining tyre load, monitoring tyre pressure, and detecting tyre conditions, thereby justifying the added device complexity through multiple benefits from a single sensor installation
Solution Approach 2:
The patent combines multiple measurement functions into a single sensor system mounted on the wheel rim, integrating cornering angle measurement with tyre monitoring functions to reduce overall system complexity despite the addition of sensors
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
Enables real-time, accurate determination of the tire's cornering angle, improving vehicle stability and control by providing essential data for vehicle control systems to adjust parameters such as braking force and steering commands.
Implementation Method 1
determining an acceleration in lateral direction to which a portion corresponding to a tread of the tyre is subjected
Data Source
AI summary
A method and a system for determining a cornering angle of a tire fitted on a vehicle during a running of the vehicle on a rolling surface includes the steps of determining the lateral acceleration of a portion of the tire tread spaced apart from the equatorial plane of the tire; determining a rotation speed of the tire; and determining the cornering angle from the lateral acceleration and the radial speed by using characteristic curves of lateral acceleration amplitude versus predetermined values of cornering angle for at least one rotation speed.