Variable Speed Pumping System Control Algorithm
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Solution Overview
Problem
Conventional pumps for aquatic applications, such as pools and spas, are often installed with fixed speed settings, which fail to accommodate changing water demands and features, leading to inefficiencies and the need for multiple pumps or frequent replacements.
Innovation Solution
A variable speed pumping system that includes a water pump driven by a motor with infinitely variable control, allowing for real-time adjustments in flow rate and pressure to match changing conditions and user needs, using sensors and a controller to optimize pump operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pump is installed with fixed speed settings to meet initial pumping demands, then the pump can operate at predetermined speeds, but it cannot accommodate changes in pumping demands or unique features of the aquatic application
Solution Approach 1:
The patent applies the dynamics principle by transitioning from fixed, predetermined speed settings to a variable speed control system that can dynamically adjust pump operation. The controller modifies motor speed in real-time based on changing pumping demands, pool features, and operational conditions, making the pump adaptable without increasing physical complexity
Solution Approach 2:
The patent implements parameter changes by allowing the pump's operational parameters (speed, flow rate, pressure) to be continuously adjusted rather than fixed. The system changes these parameters dynamically to match varying demands of different aquatic applications and features, resolving the contradiction between adaptability and complexity
2Ease of manufacture
If hydraulic calculations are performed with assumptions to simplify computations for unique pool shapes or features, then calculations can be completed, but errors are introduced that may result in an unsuitably sized pump
Solution Approach 1:
The patent applies self-service by enabling the pump system to automatically adjust its operation to match actual pumping demands. Rather than relying on potentially erroneous initial calculations, the system self-regulates flow rate and pressure based on real-time conditions, compensating for any sizing inaccuracies without requiring perfect initial measurements
Solution Approach 2:
The patent implements feedback mechanisms where the controller continuously monitors pumping conditions and adjusts motor speed accordingly. This closed-loop control compensates for errors in initial hydraulic calculations by adapting to actual performance requirements, thereby improving pump sizing accuracy post-installation
3Device complexity
If a single pump is installed to meet initial aquatic application demands, then installation is simplified, but additional pumps are needed when new features are added that exceed the pump's capacity
Solution Approach 1:
The patent applies universality by designing a single pump system capable of performing multiple functions and accommodating various aquatic features. The variable speed controller enables one pump to adapt to different flow and pressure requirements of diverse features (spas, waterfalls, fountains, etc.), replacing the need for multiple specialized pumps
Solution Approach 2:
The patent uses dynamics to enable a single pump to dynamically adjust its capacity through variable speed control. The system can scale its output to meet the demands of additional features or expanded applications, providing the adaptability of multiple pumps while maintaining the simplicity of a single device
4Productivity
If pump speed is increased to overcome resistance at the intake, then volumetric pumping rate is maintained, but energy consumption increases
Solution Approach 1:
The patent implements parameter changes by dynamically adjusting motor speed and pump operation parameters rather than maintaining constant high-speed operation. The controller optimizes the balance between pumping rate and energy consumption by modifying operational parameters to match actual demand, avoiding unnecessary energy use while maintaining required productivity
Solution Approach 2:
The patent applies feedback control where the system monitors pumping conditions and adjusts motor speed accordingly. This closed-loop control ensures the pump operates at the minimum necessary speed to achieve required flow rates, reducing energy consumption while maintaining productivity through real-time optimization
5Use of energy by moving object
If pump is adjusted to finite speed settings to match needed flow rate, then energy efficiency improves, but the pump may operate at rates that exceed or fall short of desired flow and pressure
Solution Approach 1:
The patent applies dynamics by replacing discrete, finite speed settings with continuous variable speed control. The motor can operate at any speed within its range, allowing precise matching of flow rate and pressure to exact requirements without the compromises inherent in fixed-speed operation, thereby improving both efficiency and operational precision
Solution Approach 2:
The patent implements continuous parameter changes in motor speed and pump output rather than discrete steps. This allows the system to precisely adjust flow rate and pressure to match desired operating points, eliminating the trade-off between energy efficiency and flow precision that exists with fixed-speed settings
Data Source
AI summary
A pumping system includes a pump for moving water. In one aspect, this is in connection with performance of an operation. The system includes a variable speed motor operatively connected to drive the pump. A value indicative of flow rate of water is determined and the motor is controlled to adjust the flow rate indicative value toward a constant. A value indicative of flow pressure is determined and the motor is controlled to adjust the flow pressure indicative value toward a constant. A selection is made between flow rate control and flow pressure control. In another aspect, the pump is controlled to perform a first operation, and is operated to perform a second water operation. Control of operation of the pump to perform the first water operation is altered in response to operation of the pump to perform the second operation.