Pump Control System Self-Calibration and Fault Management
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Solution Overview
Problem
Residential water systems require advanced pump control systems that can perform self-calibration, provide precise motor speed control, detect fault conditions, and store fault logs for later retrieval, while maintaining constant pressure and preventing motor shutdowns due to exceeded system parameters or faults.
Innovation Solution
The pump control system includes methods for calibrating the pump motor by sensing pressure increments, regulating motor speed through proportional-integral control, and detecting faults such as over-voltage, over-current, dry-running, and temperature issues, with the ability to reduce output voltage and frequency in limp mode and shut down the motor if necessary, while storing fault condition codes for later retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the motor is turned on and off frequently to maintain pressure, then the pressure control responsiveness is improved, but the motor reliability deteriorates
Solution Approach 1:
The patent implements pressure control by periodically cycling the motor on and off based on pressure threshold detection. The pressure switch causes the motor to run when pressure is low and stop when pressure is high, creating a periodic operation pattern that maintains pressure control while limiting continuous run time to prevent motor damage.
Solution Approach 2:
The system uses a pressure switch to provide feedback on the water system pressure state. This feedback mechanism detects whether pressure is below or above predetermined thresholds and automatically controls motor operation accordingly, enabling responsive pressure maintenance without manual intervention.
2Reliability
If a large pressurized storage tank is used to reduce motor cycling frequency, then the motor reliability is improved, but the system volume increases
Solution Approach 1:
The patent employs periodic motor operation controlled by a pressure switch to manage water pressure without requiring a large storage tank. By cycling the motor on and off at pressure thresholds, the system maintains pressure stability through active control rather than passive storage capacity.
Solution Approach 2:
The system replaces the mechanical solution of using a large storage tank for pressure stabilization with an electronic control approach using a pressure switch and periodic motor cycling. This substitution reduces the required storage tank volume while achieving similar pressure control objectives.
3Measurement precision
If the motor operates at high speed continuously to maintain pressure, then the pressure control precision is improved, but the energy consumption increases
Solution Approach 1:
The patent uses periodic motor operation instead of continuous high-speed operation. The pressure switch controls the motor to run only when pressure drops below a threshold and stop when pressure rises above a threshold, reducing energy consumption while maintaining adequate pressure control precision through on-demand operation.
Solution Approach 2:
The motor operates in multiple modes: running when pressure is low, stopping when pressure is high, and potentially running at reduced capacity during intermediate states. This multi-functional operation allows the system to achieve pressure control precision while adapting energy consumption to actual system needs.
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 ensures precise motor speed control, detects and manages faults effectively, maintains constant pressure, and prevents damage by reducing output voltage and frequency in limp mode, thereby enhancing the reliability and efficiency of residential water systems.
Implementation Method 1
sensing a pressure in the water distribution system
Implementation Method 2
a line-operated motor for driving a pump-motor assembly
Data Source
AI summary
A method and apparatus for a pump control system. One or more embodiments of the invention include a pump controller that can perform a self-calibration procedure, can provide precise motor speed control, can provide a limp mode before shutting down the motor when system parameters are exceeded and/or fault conditions occur, can detect fault conditions, and can store fault conditions for later retrieval.