Sliding Mode Controller Pole Shifting for Hydraulic Valve Tuning
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Solution Overview
Problem
The design of controllers for hydraulic valves is becoming increasingly complex and costly due to the need to manually interpret numerous coupled parameters, especially when considering non-linearities and parameter uncertainties, making it difficult to achieve efficient control quality.
Innovation Solution
A method for determining a switching function for a sliding mode controller based on control deviation and its derivatives, using poles of a closed control loop to set desired control dynamics, which simplifies the parameterization and adapts to non-linear systems by shifting poles, reducing the number of parameters to be determined.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PI controllers with non-linearities are used to control hydraulic valves, then control quality can be achieved, but the number of coupled parameters increases significantly requiring manual interpretation and extensive tuning
Solution Approach 1:
The patent transforms the controller design from using multiple coupled parameters in PI control to using a small number of poles in sliding mode control. By changing the mathematical representation from continuous parameter tuning to discrete pole placement, the complexity is dramatically reduced while maintaining control effectiveness.
Solution Approach 2:
The patent extracts the essential control characteristics by representing the switching function coefficients solely through poles of the closed control loop. This extraction eliminates the need to manually interpret and tune multiple coupled parameters, isolating the critical control elements to just the pole positions.
2Reliability
If manual tuning of controller parameters is performed to achieve desired system behavior, then control quality can be optimized, but development time and costs increase significantly
Solution Approach 1:
The patent enables the controller to self-configure by automatically determining switching function coefficients from the desired pole positions. The system eliminates the need for manual parameter interpretation and extensive tuning sessions, allowing rapid deployment without requiring expert manual adjustment of multiple coupled parameters.
3Productivity
If evolutionary hardware-in-the-loop optimization is used to automate controller design, then manual tuning time is reduced, but development costs and complexity increase
Solution Approach 1:
The patent replaces complex automated optimization systems with a straightforward mathematical approach based on pole placement. Instead of using evolutionary algorithms and hardware-in-the-loop optimization infrastructure, the method uses direct coefficient determination from desired pole positions, substituting mechanical/ computational complexity with mathematical simplicity.
Data Source
AI summary
The disclosure relates to a method for determining a switching function for a sliding mode controller for controlling a controlled variable of a system, the switching function being selected as a function of a control deviation of the controlled variable and its time derivatives up to at least the second order and on the basis of initial control dynamics of the system, coefficients of the switching function being represented by means of poles of a closed control loop of the system, the poles each being selected as a function of the control deviation, and desired control dynamics of the system being set by shifting at least one first pole of the poles, and to such a sliding mode controller and to a use of such a controller.