Delivery Module Pressure Control via Magnet Current Feedback
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Solution Overview
Problem
Existing systems for the after-treatment of exhaust gases face challenges in accurately metering operating substances like reducing agents due to fluctuating operating pressures, especially when dealing with gases or vapors, and require separate pressure sensors for pressure regulation, which complicates the process.
Innovation Solution
A device that uses a control device to monitor pressure through current detection, eliminating the need for separate pressure sensors by measuring currents from lifting and suction magnets, allowing for precise pressure control and heat transfer during low temperatures, and includes a return pump for sucking back gaseous media to prevent pressure deviations, with a valve assembly design that prevents relative movements and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate pressure sensors are used to monitor operating pressure, then pressure control accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The system uses the existing current measurement infrastructure to serve dual purposes: controlling magnet operation and monitoring operating pressure. The control device analyzes current consumption patterns of the lifting and suction magnets to infer pressure conditions, eliminating the need for separate pressure sensors while maintaining measurement accuracy.
Solution Approach 2:
The current measurement system performs multiple functions simultaneously: it controls the timing and duration of magnet activation during back-suction operations and monitors operating pressure to prevent cavitation and ensure proper fluid flow conditions. This multi-functionality reduces component count while improving system integration.
2Measurement precision
If back-suction is performed to remove gaseous components, then metering accuracy is improved, but loss of operating substance increases
Solution Approach 1:
The back-suction operation is performed partially and selectively only when gaseous components are detected through current analysis. The control device adjusts the back-suction duration and intensity based on real-time pressure monitoring, removing only the necessary amount of gas while minimizing loss of liquid operating substance. This prevents excessive back-suction that would waste material.
Solution Approach 2:
The system continuously monitors current consumption during back-suction operations and uses this feedback to determine when gas removal is complete. The control device stops the back-suction process automatically when pressure returns to normal ranges, preventing unnecessary continued operation that would increase substance loss while ensuring complete gas removal for accurate metering.
3Device complexity
If current feedback function is used for pressure monitoring, then component count is reduced, but measurement precision may be affected
Solution Approach 1:
The system uses current consumption as an intermediary parameter to indirectly measure operating pressure. By analyzing the relationship between magnet current draw and system pressure conditions, the control device derives pressure information without direct mechanical contact. This indirect measurement method maintains sufficient precision for control purposes while eliminating separate pressure sensing components.
Solution Approach 2:
The patent replaces mechanical pressure sensors with an electrical measurement system that uses current feedback from the existing magnet power circuit. This substitution eliminates mechanical moving parts and separate sensing elements, reducing component count while providing sufficient measurement precision through electrical parameter analysis and control algorithms.
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
This solution reduces component count, size, and cost, enabling precise pressure control and media supply, improving metering accuracy, and reducing noise emissions by eliminating the need for separate pressure sensors and minimizing air bubble transport issues.
Implementation Method 1
controls a lifting magnet (28) for a conveying membrane (24) and in back-suction mode a back-suction magnet (80) for actuating a back-suction conveying membrane (54)
Implementation Method 2
pressure monitoring in the control device is carried out during the operation of the magnets by means of a current feedback function
Data Source
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AI summary
Device for delivering a fluid medium that contains gas/air or steam components. The device delivers the fluid medium in a pumping direction (58) in pumping mode and in a suction direction (60) in suction mode. A control device (40) actuates a lifting magnet (28) of a delivery diaphragm (24) in the pumping direction (58) in delivery mode, and actuates a suction pump magnet (80) of a suction diaphragm (54) in the suction direction (60) in suction mode. Pressure is monitored by evaluating the current patterns of the magnets (28, 80) in the control device (40).