Pump Control System for Fluid Parameter Determination
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Solution Overview
Problem
Existing fluid pumps, particularly blood pumps used as ventricular assist devices, face challenges in accurately and reliably determining volume throughput and pressure difference across a wide range of operating parameters due to limitations in performance maps that link multiple operating parameters.
Innovation Solution
A method is introduced to divide the performance map into regions where different determination methods are used based on specific operating parameters, allowing for the consideration of additional parameters to enhance accuracy, such as speed, pressure difference, axial force, temperature, and torque, to determine volume flow rate and pressure difference, and to correct for errors by comparing values from multiple methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single determination method is used across the entire performance map, then the device complexity is reduced, but the measurement precision and reliability deteriorate across different operating regions
Solution Approach 1:
The performance map is divided into multiple operating regions (first region and second region) based on operating parameter values. Different determination methods are applied to different regions: in the first region, volume throughput is determined from rotor speed and axial bearing position; in the second region, pressure difference is determined from axial force and volume throughput from speed and pressure difference. This segmentation resolves the contradiction by adapting the determination method to specific operating conditions, maintaining high measurement precision across all regions while avoiding the need for a single overly complex method.
Solution Approach 2:
The system dynamically selects the appropriate determination method based on the current operating region. The control means automatically switches between different determination approaches depending on the detected operating parameters, allowing the system to adapt to varying operating conditions. This dynamic adaptation ensures optimal measurement precision without requiring a permanently complex determination system.
2Adaptability or versatility
If performance maps link multiple operating parameters across the entire range, then the adaptability is improved, but the measurement precision deteriorates in specific operating regions
Solution Approach 1:
The performance map is segmented into distinct operating regions with specific determination methods for each. This allows the system to maintain broad adaptability across the entire performance map while ensuring high measurement precision in each specific region by using region-optimized determination approaches rather than a single generalized method.
Solution Approach 2:
Different determination methods are applied to different local regions of the performance map based on the specific operating conditions. The first determination method is used in the first operating region while the second determination method is used in the second operating region. This local optimization ensures that each region benefits from the most appropriate determination approach, maintaining high precision locally while preserving overall system adaptability.
Data Source
AI summary
Methods for operating a pump are provided, the pump comprising a rotor for conveying fluids, wherein the volume flow rate through the pump and the pressure difference across the pump is determined, wherein at least one first operating parameter and in particular a second operating parameter of a first group of operating parameters are detected and, depending on the value of the first and in particular also the value of a second operating parameter of the first group, the volume flow rate through the pump and the pressure difference across the pump is determined from detected values of the operating parameters, either from the first group of operating parameters, or values of another set of operating parameters, in particular at least one additional operating parameter, are taken into consideration in order to determine the volume flow rate and the pressure difference across the pump.