Torque Sensor Bridge Correction for Temperature Drift
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Solution Overview
Problem
Existing sensor devices struggle to accurately detect state quantities in gear devices due to disturbances, particularly temperature fluctuations, which affect the detection of torque in bending meshing type gear devices.
Innovation Solution
The sensor device employs a configuration with distortion gauges that perform first and second detections, where the second detection has a smaller distortion amount, and uses a Wheatstone bridge circuit to correct the first detection values based on the second detection, thereby reducing the influence of temperature fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a distortion gauge is used to detect torque in a bending meshing type gear device, then the state quantity (torque) can be detected, but temperature fluctuations cause disturbances that reduce measurement precision
Solution Approach 1:
The detection function is segmented into two distinct detection modes: first detection for measuring torque with distortion gauges, and second detection for measuring temperature drift using the same gauges in a different configuration. This segmentation allows separate measurement of the target quantity and the interfering factor, enabling subsequent subtraction of the drift component to improve precision.
Solution Approach 2:
The second detection serves as an intermediary measurement that captures the temperature drift effect. By introducing this intermediate measurement, the system can indirectly quantify the harmful temperature influence and eliminate it from the first detection results, thereby improving overall measurement accuracy.
2Reliability
If distortion gauges are attached to detect torque, then torque measurement is enabled, but the detection values are affected by temperature drift
Solution Approach 1:
The system implements feedback by using the second detection results to correct the first detection results. The temperature drift information obtained through second detection is fed back to adjust and correct the torque measurement, thereby improving detection reliability by compensating for temperature-induced errors.
Solution Approach 2:
The second detection is performed as a preliminary action to measure and characterize the temperature drift before it corrupts the torque measurement. By preliminarily capturing the drift information, the system can prepare correction data to improve the reliability of subsequent torque measurements.
3Measurement precision
If multiple detection modes are implemented to correct for temperature drift, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The same distortion gauges are designed to perform multiple functions: they can be configured for first detection to measure torque and for second detection to measure temperature drift. This multi-functionality allows the system to achieve improved measurement precision through multiple detection modes without adding separate dedicated sensors, thereby limiting the increase in device complexity.
Solution Approach 2:
The first detection and second detection capabilities are merged into a single integrated detection system using the same distortion gauge apparatus. By combining both detection functions in one system rather than using separate independent systems, the patent achieves accurate distortion measurement with temperature compensation while minimizing the increase in overall device complexity.
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 allows for more accurate detection of distortion and torque in bending meshing type gear devices by minimizing the impact of temperature drift, enabling continuous and efficient distortion measurement during rotational operations.
Implementation Method 1
uses a Wheatstone bridge circuit to correct the first detection values based on the second detection
Implementation Method 2
employs a configuration with distortion gauges that perform first and second detections
Data Source
AI summary
Provided is a sensor device that detects a predetermined state quantity, including: a correction unit that performs first detection and second detection having a smaller generated state quantity than the first detection, and that corrects a detection value of the first detection, based on a detection value of the second detection.