Tire Rolling Resistance Testing Device Drift Correction
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Solution Overview
Problem
Existing tire rolling resistance testing methods face inaccuracies due to amplifier drift, which is difficult to correct accurately across different tire rotations and measurements, leading to unreliable results.
Innovation Solution
A method and device that adjust the force component meter to zero, measure tangential forces in both rotation directions, and compare these forces with predetermined threshold values to identify and exclude abnormal measurements caused by drift, ensuring accurate rolling resistance calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If drift correction is performed using previously stored drift amounts, then the measurement process can continue without interruption, but the measurement accuracy deteriorates because drift amounts vary by rotational direction and each tire making accurate correction difficult
Solution Approach 1:
The patent performs a determination step after the rolling resistance measurement step to check whether the drift amount exceeds a threshold value. This preliminary check allows the system to identify abnormal measurements before they affect the final results, enabling continuous operation while maintaining accuracy through post-measurement validation rather than attempting to predict or pre-correct drift variations.
Solution Approach 2:
The patent implements a feedback mechanism where the drift amount is measured and compared against a threshold value KA. When the drift exceeds the threshold, the system identifies the measurement as abnormal and excludes it from results. This feedback loop ensures that only valid measurements are accepted, maintaining measurement accuracy while allowing the system to operate continuously without manual intervention.
2Measurement precision
If the force component meter is amplified to detect weak sensor signals, then the sensitivity of measurement is improved, but the reliability deteriorates due to amplifier drift causing divergence between actual and displayed values
Solution Approach 1:
The patent uses feedback by continuously monitoring the drift amount through the determination step and comparing it with threshold value KA. When drift exceeds the threshold, the system identifies the measurement as abnormal and excludes it, thereby maintaining reliability while preserving the amplified signal detection capability.
Solution Approach 2:
The system performs self-validation by automatically detecting when amplifier drift has corrupted a measurement through the determination step. The system serves itself by identifying and excluding abnormal measurements without external intervention, maintaining both sensitivity and reliability autonomously.
Data Source
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AI summary
This invention improves the precision and reliability with which rolling resistance can be measured. This rolling-resistance testing method includes a rolling-resistance measurement stage and a determination stage. In the rolling-resistance measurement stage, a component force meter is used to measure the tangential axial force that occurs in a tire axle when the tire is rotated under load. In the determination stage, the axial force is measured in a no-load stopped state in which the tire has been separated from a drum, said axial force is compared to a threshold, and if the axial force is greater than said threshold, a determination that an anomaly has occurred in the test is made.