Pump Assembly Speed Control Using Sectionwise Monotonic Error Signals
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Solution Overview
Problem
In branched hydraulic systems, controlling pump assemblies to maintain adequate pressure across all points while minimizing energy consumption and avoiding flow noise is challenging, as existing systems often require complex designs to detect load regions and adjust pump speeds accordingly.
Innovation Solution
A closed-loop control method for pump assemblies in pneumatic or hydraulic systems that detects system variables using sensors and processes error signals through a sectionwise monotonic function to optimize pump speed, allowing for adaptive control independent of system design and components, thereby simplifying the control process and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If pump speed is increased to maintain adequate pressure at all system points, then pressure supply is improved, but energy consumption increases
Solution Approach 1:
The pump speed is made dynamically adjustable based on real-time detection of system variables (pressure, flow, temperature) from multiple locations. The control device continuously adapts the pump speed to match actual system demands, avoiding constant high-speed operation and reducing energy consumption while maintaining adequate pressure where needed.
Solution Approach 2:
The system implements closed-loop feedback control by detecting system variables at multiple locations and using this information to adjust pump speed. The control device receives feedback signals from sensors throughout the system and automatically modifies pump operation to optimize both pressure distribution and energy efficiency.
2Stress or pressure
If pump speed is increased to ensure adequate pressure, then pressure distribution is improved, but flow noise increases
Solution Approach 1:
The pump operates at dynamically optimized speeds rather than constant high speed, adjusting to actual system requirements. This prevents excessive flow velocities that generate noise while ensuring adequate pressure distribution through intelligent speed modulation based on detected system conditions.
3Manufacturing precision
If complex control systems are used to detect load regions and adjust pump speed, then pressure control precision is improved, but device complexity increases
Solution Approach 1:
The system divides the hydraulic network into multiple detection locations with sensors positioned at different branches and consumers. Each location independently detects local system variables, and the control device processes these segmented measurements to determine overall system state and adjust pump speed accordingly, achieving precise control through distributed sensing.
Solution Approach 2:
The control device serves multiple functions: it receives signals from multiple sensor locations, processes various system variables (pressure, flow, temperature), determines system load conditions, and controls pump speed. This multi-functional approach achieves precise pressure control without requiring separate specialized control systems for each function.
Data Source
AI summary
A control method for a pump assembly (10, 12) in a pneumatic or hydraulic system controls a speed (n) of the pump assembly (10, 12) in dependence on at least one variable (Dp, p, T, xp) which is detected in the system. An error signal (e) is produced from the detected variable (Dp, p, T, xp) on the basis of a sectionwise monotonic function. On the basis of the error signal, the speed (n) of the pump assembly (10, 12) is controlled.