Tire Rotation Speed Correction via Slippage Elimination
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Solution Overview
Problem
The detection of tire pressure loss in driving wheel tires is less accurate due to the influence of tire slippage, which varies with wheel torque, making it difficult to eliminate slippage effects from rotation speed measurements used in pressure loss indication values.
Innovation Solution
A rotation speed correction apparatus and method that calculates a comparative value between the driving wheel tire and a following wheel tire, identifying a linear relationship between this value and wheel torque to eliminate slippage influence, allowing for accurate tire pressure loss detection and correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rotation speed of driving wheel tire is used to detect tire pressure loss, then pressure loss detection can be performed, but detection accuracy deteriorates due to tire slippage influence
Solution Approach 1:
The patent introduces a comparative value as an intermediary parameter that compares the rotation speed of the driving wheel tire with that of a non-driving wheel tire. This comparative value serves as a mediator that eliminates the slippage effect, allowing accurate pressure loss detection without being affected by the harmful slippage factor.
Solution Approach 2:
The patent extracts and eliminates the slippage influence from the rotation speed measurement by using the difference between driving and non-driving wheel rotation speeds. By taking out the common slippage component that affects both wheels equally, the method isolates the pressure loss signal.
2Reliability
If pressure loss indication value is calculated from driving wheel rotation speed, then pressure loss can be indicated, but indication accuracy varies with wheel torque due to slippage
Solution Approach 1:
The comparative value acts as an intermediary that provides a torque-independent measure of pressure loss. By comparing driving and non-driving wheel speeds, the system obtains a reliable indication value that adapts consistently across different torque conditions, eliminating the variability caused by slippage.
3Adaptability or versatility
If rotation speed measurement is used for both pressure detection and braking control, then multiple functions are achieved, but accuracy deteriorates due to slippage affecting both applications
Solution Approach 1:
The patent segments the rotation speed information into two distinct components: the comparative value for pressure loss detection and the corrected rotation speed for braking control. This segmentation allows each application to use the most appropriate processed form of the data, with both benefiting from slippage elimination.
Solution Approach 2:
The comparative value serves as an intermediary calculation that provides corrected rotation information suitable for both pressure detection and braking control applications, improving the precision of both functions simultaneously.
Data Source
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AI summary
Provided is a rotation speed correction apparatus configured to correct a rotation speed of a driving wheel tire mounted on a vehicle, and includes a comparative value calculation unit, a torque obtainment unit, and a rotation speed calculation unit. The comparative value calculation unit calculates a comparative value between a rotation speed of the driving wheel tire and a rotation speed of a following wheel tire mounted on the vehicle on the basis of the rotation speeds of the driving wheel tire and the following wheel tire. The torque obtainment unit obtains a wheel torque. The rotation speed calculation unit identifies a linear relationship between the comparative value and the wheel torque, and on the basis of the rotation speed of the following wheel tire and the linear relationship, calculates a rotation speed of the driving wheel tire in which influence of slippage has been eliminated.