Torque Wrench Self-Calibration Using Compensation Coefficients
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Solution Overview
Problem
Existing electronic torque tools require complex calibration processes involving external instruments, making them inaccessible for ordinary consumers or operators without access to calibration equipment.
Innovation Solution
A torque wrench with an integrated measuring device and control panel allows users to set compensation coefficients and torque ranges, enabling on-site calibration without external equipment, by displaying compensated torque values based on measured values and predefined coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external calibration instruments and computer connections are used for error correction, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent merges the calibration functionality into the torque wrench itself by integrating a processor that can store multiple compensation coefficients and automatically select appropriate coefficients based on measured torque ranges. This eliminates the need for separate external calibration instruments and computer connections, resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The torque wrench performs self-calibration by using its own processor to store compensation coefficients obtained through calibration processes and automatically apply them during measurement operations. The device serves its own calibration needs without requiring external calibration equipment, improving ease of operation while maintaining measurement precision
2Measurement precision
If external calibration instruments and computer connections are required for error correction, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The torque wrench performs self-calibration by using its own processor to store compensation coefficients obtained through calibration processes and automatically apply them during measurement operations. The device serves its own calibration needs without requiring external calibration equipment, improving ease of operation while maintaining measurement precision
Solution Approach 2:
The calibration coefficients are stored in advance in the processor's memory, allowing the device to perform rapid automatic selection and application of appropriate compensation coefficients during measurement operations without requiring real-time external calibration equipment, thus improving ease of operation
3Measurement precision
If multiple compensation coefficients are stored and automatically selected, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The processor stores multiple compensation coefficients corresponding to different torque ranges and automatically selects the appropriate coefficient based on the measured torque value. This allows the system to adapt measurement parameters dynamically, improving measurement precision across different operating conditions while keeping the control logic relatively simple through automatic range detection
Data Source
AI summary
A torque wrench includes a body and a measuring device. The body has a driving portion disposed at one end thereof. The measuring device is coupled to the body and has a control panel, which is provided with a setting button and a display unit. The setting button is configured to be pressed to allow the measuring device to set a first compensation coefficient that is between 0.85 and 1.15. The measuring device is capable of measuring the torque of the driving portion to obtain a measured torque value and to display a compensated torque value on the display unit. The compensated torque value is the product of the measured torque value and the first compensation coefficient.