Load Cell Filtering with Adaptive Settling Time Selection
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Solution Overview
Problem
Existing load cell filtering technologies face limitations in precision and speed due to the lack of specific processing for dynamic and stable processes, resulting in a restricted application scope and effectiveness.
Innovation Solution
A filtering method and apparatus that utilize multiple filtering units with different settling times to determine a target filtering unit based on fluctuation indices and user requirements, optimizing precision and speed for load cell weighing applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If filtering processing is performed on the weighing signal to eliminate errors, then measurement precision is improved, but settling time becomes longer resulting in lower productivity
Solution Approach 1:
The patent applies dynamics by making the filter settling time adjustable rather than fixed. The control method dynamically adapts the settling time based on the detected weighing state (dynamic or stable), allowing the system to optimize between precision and speed in real-time according to operational conditions
Solution Approach 2:
The patent changes the filter parameter (settling time) based on the weighing state. By detecting whether the system is in a dynamic or stable state and adjusting the settling time accordingly, the system achieves high precision when stable and fast response when dynamic, resolving the contradiction between precision and speed
2Adaptability or versatility
If a single filter settling time is used for both dynamic and stable states, then device complexity is reduced, but adaptability is limited resulting in restricted application scope
Solution Approach 1:
The patent segments the weighing process into two distinct states: dynamic state and stable state. By detecting the current state and applying different filter settling times for each segment, the system achieves high adaptability without requiring a completely complex multi-filter system, as each state uses an optimized single settling time parameter
Solution Approach 2:
The patent implements feedback by continuously detecting the weighing state (dynamic or stable) and using this information to adjust the filter settling time. This closed-loop control enables the system to adapt to different conditions automatically, expanding application scope while maintaining manageable complexity through intelligent state-based adjustment
Data Source
AI summary
These disclosures provide a filtering method and control apparatus for a load cell. The method includes: filtering, by using a plurality of filtering units, first weighing data obtained by the load cell to obtain a plurality of pieces of second weighing data, where the filtering units have different settling times. Obtaining a fluctuation index of each piece of second weighing data, and establishing a correspondence between a fluctuation index and a settling time of each filtering unit. Determining a target filtering unit based on the correspondence according to a weighing requirement, where a fluctuation index of the target filtering unit matches a target precision in the weighing requirement, and a settling time of the target filtering unit matches a target speed in the weighing requirement. The method and apparatus disclosed improves speed and user experience in a weighing process.