Tire Tread Depth Tracking Across Storage and Reuse Phases
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Solution Overview
Problem
Existing methods for determining tire profile depth based on dynamic rolling radius are flawed when tires are not in use for extended periods, as they fail to account for dimensional changes due to creep or aging, leading to inaccurate measurements upon resumption of use.
Innovation Solution
A method that uses a third sensor, such as an acceleration sensor or TPMS, to detect a phase of non-use, triggering a new starting value for dynamic rolling radius, which is then used for accurate profile depth determination upon resumption of use, accounting for dimensional changes during storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the dynamic rolling radius is continuously monitored to determine tire profile depth, then measurement precision is improved, but accuracy deteriorates when the tire is stored for extended periods due to dimensional changes from creep or aging
Solution Approach 1:
The system dynamically adapts the reference value for profile depth calculation based on the detected movement status. When a phase change from non-use to use is detected, the reference value is automatically updated to reflect the current tire dimensions, accounting for creep or aging effects that occurred during storage. This dynamic adaptation ensures measurement accuracy is maintained despite dimensional changes over time.
Solution Approach 2:
The system uses feedback from the third sensor (acceleration sensor or TPMS) regarding tire movement status to trigger updates of the reference value. The feedback mechanism detects when the tire transitions from a stored state to an active state, initiating a recalculation of the reference profile depth that incorporates dimensional changes occurred during the non-use period, thereby maintaining measurement reliability.
2Device complexity
If the last-calculated dynamic rolling radius value is stored and used for continued calculation after a phase of non-use, then device complexity is reduced, but measurement precision deteriorates due to unaccounted dimensional changes from creep or aging
Solution Approach 1:
The system performs self-calibration by automatically detecting its own operational state through the third sensor. When the tire is detected to be in a non-use state and then transitions to use, the system self-corrects the reference value to account for dimensional changes, eliminating the need for external manual intervention or complex additional calibration equipment.
Solution Approach 2:
The system changes the reference parameter (profile depth reference value) based on detected operational conditions. When transitioning from a non-use phase to a use phase, the reference value is updated to reflect current tire dimensions, accounting for parameter changes (dimensional changes) that occurred during storage, thereby maintaining measurement precision without increasing device complexity.
Data Source
AI summary
A method and control system for determining the tread depth of a tire tread, in which the current dynamic rolling radius of the tire is continually determined in usage phases of the tire by ascertaining a current angular velocity of the tire from data determined by a first sensor and ascertaining a current velocity of the vehicle from data determined by a second sensor and determining the current dynamic rolling radius on the basis of the determined current angular velocity and the current velocity of the vehicle. A starting value of the dynamic rolling radius is recorded at the beginning of a first usage phase and a current tread depth of the tire is determined from deviations of the current dynamic rolling radius from the starting value, and wherein a current movement status of the tire is ascertained from data determined by a third sensor, by determining a usage phase as the movement status if data determined above a predefined limit value exist and determining a non-usage phase as the movement status if data determined below a predefined limit value over a predefined time period exist. In the event of a change in the movement status from a non-usage phase to a subsequent usage phase, a new starting value of the dynamic rolling radius is recorded and the subsequently determined current dynamic rolling radii are compared with said new starting value instead of with the previous starting value in order to continually determine the current tread depth.