Tire Slip Detection via Acceleration Integration
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Solution Overview
Problem
Current methods for detecting tire slip states, especially in the contact region of a rotating tire, are inaccurate and unable to effectively prevent slide slip behavior, which can lead to loss of vehicle control and accidents.
Innovation Solution
A tire slip state detecting method that acquires and processes acceleration data from the tread portion of the tire, using time integration and high-frequency component analysis to identify the contact and slip regions, allowing for precise determination of the slip state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acceleration sensors are attached to the tire to acquire measurement data, then it is possible to estimate the status of the road surface, but it is not possible to detect the slide slip state
Solution Approach 1:
The patent extracts specific features from the acceleration measurement data by separating the contact region from the non-contact region, and further extracting the slip region within the contact region. This extraction process transforms the raw acceleration data into meaningful slip state information that can reliably detect slide slip behavior.
Solution Approach 2:
The patent introduces a new dimension of analysis by examining acceleration data in the width direction of the tire in addition to the radial direction. This dimensional expansion enables the detection of slip-specific characteristics that are not visible in single-direction measurements, thereby enabling reliable slide slip detection.
2Device complexity
If control is achieved by measuring forces and speeds applied to the tire as a whole, then the control system is simple, but it cannot estimate slide slip behavior with accuracy
Solution Approach 1:
The patent segments the tire contact region into distinct zones: contact region, slip region, and adhesion region. By dividing the measurement analysis into these segments, the system achieves accurate slide slip detection without requiring complex additional hardware, as the segmentation is performed through signal processing of existing acceleration data.
3Measurement precision
If the slip angle increases, then the adhesion region decreases while the slip region increases, but this leads to whole tire slide slip which is difficult to detect and control
Solution Approach 1:
The patent performs preliminary identification of the contact region and slip region before slide slip occurs by continuously analyzing acceleration patterns. This preliminary detection allows the system to identify emerging slip conditions and alert the driver or trigger preventive control actions before the tire enters a fully slipped state that is difficult to recover from.
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 method enables efficient and accurate identification of the slip state, allowing for timely intervention to prevent slide slip behavior and improve vehicle control.
Implementation Method 1
an acceleration sensor (2) for detecting acceleration in a radial direction of the tire (1)
Implementation Method 2
a deformation calculating unit (16) for calculating deformation of the tread portion by subjecting the time series data of acceleration due to tire deformation to a time integration of second order to obtain displacement data
Data Source
AI summary
To detect a slip state in a contact region of a rotating tire on a road surface, first, the first radical direction data and the second width direction data of measurement data of acceleration at a tread portion of the rotating tire for a duration corresponding to one round of tire rotation are acquired. Second, time series data of acceleration due to tire deformation is extracted from the first radical direction data and displacement data is obtained by subjecting the time series data of acceleration due to tire deformation to a time integration of second order, thereby a deformation at the tread portion is calculated and a contact region of the rotating tire is determined from the calculated deformation. Next, from the second width direction data, a slip region within the determined contact region is specified based on vibration level of the second data.