Fluid Valve Oscillating Control via Pressure Feedback
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Solution Overview
Problem
Existing hydraulic systems face challenges in adapting to changing environmental conditions and long-term influences such as dirt, chips, and aging, leading to non-linear behavior and high complexity in actuator control, particularly in pressure-controlled systems where precise friction parameters are required.
Innovation Solution
The method involves detecting pressure fluctuations generated by an oscillating valve movement and using them to regulate the valve, eliminating the need for knowledge of friction parameters and allowing for robust control settings, even with parameter scattering and aging, by superimposing basic and oscillating movements to achieve precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure-controlled hydraulic systems are used to correct disturbance variables, then the disturbance variables can be corrected and implemented easily, but the actuators exhibit particularly high level of non-linearity, discontinuity and ambiguity
Solution Approach 1:
The patent applies mechanical vibration by superimposing a low-frequency oscillating movement on the valve actuator. This continuous small-amplitude vibration prevents stick-slip-friction transitions and keeps the valve component in constant motion, thereby linearizing the actuator behavior and reducing non-linearity, discontinuity, and ambiguity while maintaining effective disturbance variable correction
Solution Approach 2:
The patent implements periodic action by adding a low-frequency oscillating signal to the control signal. This periodic movement overlay continuously cycles the valve component through small amplitude motions, ensuring that friction and stick-slip effects are avoided while maintaining the primary pressure control function
2Reliability
If a low-frequency motion superimposition is provided to avoid stick-slip-friction transitions, then stick-slip-friction transitions are avoided, but precise knowledge of friction parameters is required which requires constant environmental conditions and actuators with low parameter scatter
Solution Approach 1:
The patent employs feedback by continuously detecting the actual valve component position and comparing it with the desired position. The control system uses this feedback information to dynamically adjust the control signal, compensating for friction effects, environmental condition changes, and parameter scatter without requiring precise prior knowledge of friction parameters
Solution Approach 2:
The system implements self-service by automatically adapting to changing environmental conditions and parameter variations through its feedback control mechanism. The control system self-adjusts the oscillating movement parameters and compensation signals based on real-time system state, eliminating the need for manual calibration or constant environmental conditions
3Measurement precision
If an electromechanical displacement sensor is arranged in direct connection with the movable valve component to detect movement, then the behavior of the movable valve component is recorded directly, but a corresponding amount of available installation space and high level of effort and expense are required
Solution Approach 1:
The patent uses pressure fluctuations in the fluid as an intermediary to indirectly detect valve component movement. Instead of directly measuring valve position with complex electromechanical sensors, the system detects pressure changes in the fluid caused by valve movement, providing accurate measurement information through a simpler pressure sensing approach
Solution Approach 2:
The patent replaces the mechanical electromechanical displacement sensor system with a fluid-based pressure detection system. By substituting direct mechanical measurement with fluid pressure measurement, the system achieves equivalent measurement precision while significantly reducing installation complexity, space requirements, and cost
Data Source
Figure 1~2
AI summary
The invention relates to a method for operating a fluid valve (1) for controlling or regulating a fluid (24), comprising at least one movable valve component, which can be displaced by at least one electric actuating signal containing at least one first actuating signal portion that brings about an oscillating valve movement of the valve component. According to the invention, pressure oscillations produced by the oscillating valve movement are captured in the fluid (24) and used for control (31) of the oscillating valve movement, said control being brought about by the first actuating signal portion. The invention further relates to a controller for operating a fluid valve (1).