Electronic Scale Auto-Zeroing with Load Threshold Detection
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Solution Overview
Problem
Electronic scales, particularly medical scales, face inaccuracies and imprecision due to environmental changes affecting the zero point of load cells, leading to inefficient manual or automatic zeroing processes that either delay use or result in incorrect measurements.
Innovation Solution
The system includes a load cell and an electronic processor that automatically initiates a powerup zeroing function only if no weight is applied, overriding it if weight is detected, and detects and corrects zero point drift over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automatic powerup zeroing is performed, then measurement accuracy is improved, but scale availability and speed of use deteriorate
Solution Approach 1:
The system dynamically adjusts the zeroing behavior based on real-time conditions. Instead of always performing powerup zeroing, the system checks whether a load is present and adapts its behavior: performing zeroing when the scale is empty (maintaining accuracy) and skipping zeroing when a load is detected (improving availability). This conditional logic makes the system flexible and context-aware.
Solution Approach 2:
The system uses feedback from the load cell to determine whether to perform powerup zeroing. By continuously monitoring the load cell signal and comparing it against a threshold, the system receives feedback about the presence of a load and adjusts its zeroing behavior accordingly. This feedback mechanism enables the system to make informed decisions about when to prioritize accuracy versus availability.
2Productivity
If manual zeroing is performed, then scale availability is improved, but measurement accuracy deteriorates due to user error
Solution Approach 1:
The system performs zeroing automatically without requiring user intervention. The electronic processor autonomously monitors the load cell, determines when zeroing is appropriate, and executes the zeroing function without user input. This eliminates user errors while maintaining scale availability, as the system self-manages the zeroing process based on detected conditions.
3Reliability
If powerup zeroing is always performed, then zero point drift is corrected, but time loss increases due to waiting
Solution Approach 1:
Instead of always performing the full powerup zeroing sequence, the system performs zeroing only partially or selectively based on conditions. When a load is detected, the system skips the zeroing action entirely, performing only the necessary load measurement. This partial action approach reduces unnecessary wait time while maintaining reliability when needed.
4Productivity
If zeroing is performed with load present, then scale availability is improved, but measurement accuracy deteriorates due to incorrect zero point
Solution Approach 1:
The system takes preliminary action to prevent the harmful effect of zeroing with load present. By checking the load cell signal before initiating zeroing and comparing it against a threshold, the system proactively identifies when a load is present and prevents the zeroing action from occurring. This preliminary check eliminates the risk of incorrect zeroing while maintaining scale availability.
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
Maintains accuracy and precision while allowing quick and convenient scale use by overriding zeroing if weight is present, and automatically compensates for zero point drift, ensuring reliable measurements.
Implementation Method 1
Modern electronic scales measure weight using load cells, which produce voltages proportional to the force applied to the load cells by an object being weighed
Data Source
AI summary
Systems and methods for electronic scale auto-zeroing. One example system includes a load cell coupled to a platform of the scale and an electronic processor coupled to the load cell. The processor is configured to receive an activation command activating the scale and, responsive to receiving the command, initiate a powerup zeroing function. The processor is configured to receive, from the load cell, a first signal indicative of a force applied to the platform and, responsive to receiving the first signal, determine whether the force applied to the platform of the scale exceeds a threshold. The processor is configured to, responsive to determining that the force exceeds the threshold: cancel the powerup zeroing function, and calculate a weight based on the first signal. The processor is configured to, responsive to determining that the force does not exceed the threshold, complete the powerup zeroing function.