Filling Valve and Flow Sensor Synchronization for Precise Dosing
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Solution Overview
Problem
Existing filling devices suffer from inaccuracies in measuring medium flow due to temporal discrepancies between the start of the filling process and the recording of flow measurement values, leading to measurement errors and fluctuations, especially in processes lasting a short duration.
Innovation Solution
Synchronize the start of the filling process between the filling valve and the flow sensor to establish a defined temporal relationship between the initial opening of the filling valve and the acquisition of the first sampled flow measurement, minimizing the measurement error by ensuring the flow measurement is recorded as close as possible to the initial opening of the filling valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a time-discrete sampling flow sensor is used to measure medium flow, then the device complexity is reduced and ease of manufacture is improved, but measurement precision deteriorates due to temporal discrepancies between filling valve opening and flow measurement recording
Solution Approach 1:
The control unit triggers the flow sensor to perform its first measurement before the filling valve is opened. This preliminary action ensures that the flow sensor is already in measurement mode and ready to capture flow data from the moment the valve opens, eliminating the temporal discrepancy that would otherwise cause measurement errors. The sensor is prepared in advance to accurately record the initial flow phase.
Solution Approach 2:
The control unit receives the first measured flow value from the flow sensor and uses this feedback information to adjust and optimize subsequent filling operations. By continuously monitoring the flow measurements and comparing them against target values, the system can make real-time adjustments to maintain high measurement precision throughout the filling process.
2Device complexity
If the first sampled flow measurement value is recorded far from the initial opening of the filling valve, then device complexity is reduced, but manufacturing precision deteriorates due to increased measurement errors
Solution Approach 1:
The system performs the first flow measurement in advance, before the filling valve opens. This preliminary measurement setup ensures that when the valve opens and medium flow begins, the flow sensor is already active and ready to capture data immediately, minimizing the time gap between valve opening and first measurement recording.
Solution Approach 2:
The control unit processes the first measured flow value and uses this feedback to optimize the timing and parameters of subsequent measurements, ensuring that the temporal relationship between valve opening and measurement recording is continuously optimized for high precision filling operations.
3Measurement precision
If sampling frequency is increased to reduce measurement errors, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The flow sensor is triggered to perform its first measurement before the filling valve opens. This preliminary action ensures that the sensor is already in measurement mode when flow begins, capturing the critical initial flow phase without requiring continuous high-frequency sampling throughout the entire filling process, thus reducing overall energy consumption while maintaining precision.
Solution Approach 2:
Instead of continuous sampling, the system uses periodic sampling where the flow sensor is triggered at specific intervals - particularly before valve opening and at defined measurement points during filling. This periodic measurement approach maintains measurement precision for critical phases while significantly reducing energy consumption compared to continuous high-frequency sampling.
Data Source
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AI summary
A method (1) for operating a filling device (2) with a filling valve (3) for controlling a medium flow, with a time-discrete sampling flow sensor (4) for measuring the medium flow (V') released by the filling valve (3) and with a control unit (5) for controlling the filling valve (3) is presented and described, wherein the control unit (5) controls the filling valve (3) to carry out a filling process with a defined target filling quantity (Vtarget) taking into account the measured actual filling quantity (Vist), which is determined using the flow measurement values recorded by the flow sensor (4).A measurement error caused by the time-discrete sampling of the flow measurement is reduced by synchronizing (sync) the start of the filling process between the filling valve (3) and the flow sensor (4), so that the first sampled (tsl) flow measurement value of the flow sensor (4) is in a defined temporal relationship to the initial opening (topen) of the filling valve (3) during the filling process.