Wheel Nut Looseness Detection Using Centrifugal Acceleration
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Solution Overview
Problem
Existing detection devices struggle to set a reference value for the looseness of nuts fastened to wheel rims due to varying wheel rim vibrations based on vehicle or tire type, necessitating a method to easily establish this reference value regardless of these variations.
Innovation Solution
A detection device and method that utilizes a sensor unit to detect acceleration in axes intersecting with the rotation axis of a rotating body, setting a reference acceleration after the absolute value of acceleration equals zero, allowing automatic definition of this reference based on centrifugal forces during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference value for nut looseness detection is set based on wheel rim vibration characteristics, then detection accuracy for specific vehicle/tire types is improved, but the complexity of setting and adapting to different vehicle/tire types increases
Solution Approach 1:
The detection device automatically determines the reference value by utilizing the centrifugal acceleration generated during normal wheel rotation, eliminating the need for manual calibration or pre-setting of reference values for different vehicle and tire types. The system serves itself by using its own operational conditions to establish the baseline for looseness detection.
Solution Approach 2:
The system changes the operational parameter from static reference value setting to dynamic determination based on rotation speed. By utilizing the relationship between centrifugal acceleration and rotation speed (a = ω²r), the system adapts the reference value automatically according to the actual operating conditions of different vehicles and tires.
2Measurement precision
If manual calibration is performed to set reference acceleration values for different vehicle and tire types, then detection accuracy is improved, but the time and effort required for setup increases
Solution Approach 1:
The system eliminates manual calibration by automatically determining the reference acceleration value during normal operation. The centrifugal acceleration generated by wheel rotation serves as the natural reference, removing the time-consuming manual setup process while maintaining detection accuracy.
Solution Approach 2:
The system performs the reference value determination automatically during the initial rotation phase, so that by the time actual looseness detection begins, the reference value is already established. This preliminary automatic action eliminates the need for separate manual calibration steps.
3Reliability
If the detection system uses vibration-based methods for nut looseness detection, then detection capability is improved, but the system becomes sensitive to variations in vehicle and tire types
Solution Approach 1:
The system transitions from using fixed vibration characteristics to using centrifugal acceleration parameters that scale with rotation speed. By establishing the reference value based on the actual centrifugal acceleration (a = ω²r) during operation, the system adapts to different vehicle and tire types without losing detection capability.
Solution Approach 2:
The detection system achieves universality by using a detection method that works across different vehicle and tire types. The centrifugal acceleration-based reference value determination allows the same system to adapt to various mounting conditions, vehicle weights, and tire characteristics without requiring type-specific calibration.
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 approach simplifies the setting of reference acceleration, reducing user effort and time, and enables accurate detection of nut looseness by comparing detected accelerations with the defined reference.
Implementation Method 1
the rotation of the rotating body is started, the fastening member is subjected to a centrifugal acceleration of a predetermined magnitude or greater
Data Source
AI summary
A sensor device includes an acceleration sensor that detects an X-axis acceleration and a Y-axis acceleration. The sensor device further includes a signal processor that detects a fastening state of each nut based on a comparison result between a rotation angle of the sensor device calculated based on the X-axis acceleration and the Y-axis acceleration and an initial rotation angle of the sensor device calculated based on an initial value of each of the X-axis acceleration and the Y-axis acceleration. After each of the X-axis acceleration and the Y-axis acceleration becomes equal to a value that can be regarded as a zero value, the signal processor defines an acceleration which is detected by the acceleration sensor and is greater than the zero value as an initial acceleration.