Modulating Filling Valve Control Without Flowmeter Delay
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Solution Overview
Problem
Existing filling machines suffer from inefficient flowrate control due to delayed command signals from flowmeters, which are an order of magnitude slower than control unit update rates, leading to inefficient operation.
Innovation Solution
A modulating filling valve system with a shutter and actuator controlled by a control unit using a three-dimensional table to estimate flowrate based on position and pressure signals, eliminating the need for flowrate sensors and enabling rapid command signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a flowmeter is used to measure flowrate and generate command signals for the modulating valve, then flowrate measurement is achieved, but the control system experiences significant delay because the flowmeter output rate is an order of magnitude slower than the control unit update rate
Solution Approach 1:
The patent removes the flowmeter from the control system entirely. Instead of measuring flowrate directly and using it for control, the system extracts only the necessary control parameters (position and pressure) that can be measured rapidly, eliminating the bottleneck caused by slow flowrate measurement while maintaining adequate flow control capability
Solution Approach 2:
The patent creates a simplified model of the system where flowrate is not directly measured but inferred from position and pressure data. The control unit uses a three-dimensional table storing pre-calculated flowrate values based on shutter position and pressure, allowing rapid lookup and control without waiting for actual flowrate measurements
2Manufacturing precision
If flowrate sensors are installed to enable precise flowrate-based control, then control accuracy is improved, but device complexity and cost increase due to additional sensors and slower control loops
Solution Approach 1:
The control unit performs multiple functions: it controls the modulating valve position, monitors pressure, and provides feedback control. By making the control unit multi-functional and using existing position and pressure sensors for both monitoring and control purposes, the system achieves precise filling control without adding dedicated flowrate measurement capability
Solution Approach 2:
The system uses its own existing sensors (position sensor and pressure sensor) to provide all necessary control information. The control unit processes position and pressure data to infer flow conditions and adjust the valve accordingly, making the control system self-sufficient without external flow measurement devices
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
The system achieves precise and rapid control of filling operations without flowrate sensors, allowing for flexible filling at varying pressures and improved production efficiency.
Implementation Method 1
the coil of the actuator receives, in use, a command signal from the control unit and produces, according to a known mode of operation typical of the coils, a corresponding magnetic field adapted to move the shutter by means of magnetic interaction with the permanent magnets included in the shutter itself
Data Source
Figure 1
Figure 2
AI summary
An apparatus (1) for filling a container (2) includes a shutter (8) movable along an axis (A) for closing or opening, in a variable manner, an outflow passage of the valve (5) itself, designed to control the filling of the container (2) with a pourable product under pressure, a position sensor for measuring the position of the shutter (8) along the axis (A), a pressure sensor (28) for measuring the pressure of the pourable product, and a control unit (27) having a memory holding a predetermined dataset, which contains flowrate values as a function of the pressure of the pourable product and the position of the shutter (8), and estimating flowrate from the dataset as a function of the measured position of the shutter (8) and the measured pressure of the pourable product to control the position of the shutter (8).