Piezo Valve Closed-Loop Control via Error Integral Adaptation
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Solution Overview
Problem
Piezo valve devices experience changes in real opening voltage values due to aging, temperature changes, and differential pressure, which affect the quality of closed-loop control, making it challenging to maintain high performance, especially when direct determination of the real opening voltage is not possible without interrupting normal operation.
Innovation Solution
A method for closed-loop controlling a piezo valve device that calculates a control error integral signal to adjust a simulated opening voltage value, allowing the control system to adapt to changes in the real opening voltage without direct measurement, ensuring high performance and flexibility in operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct determination of the real opening voltage value is performed, then measurement precision is improved, but operation must be interrupted and device complexity increases
Solution Approach 1:
The patent implements feedback by using the control error integral signal to continuously monitor and detect changes in the real opening voltage value during normal operation. The controller adjusts the control opening voltage value based on the integral of control errors, creating a closed-loop feedback mechanism that automatically adapts to drift without interrupting the system.
Solution Approach 2:
The patent introduces an intermediary approach by using the control error integral signal as a mediator to indirectly determine changes in the real opening voltage value. Instead of directly measuring the opening voltage, the system uses the integrated control error as an intermediate indicator that reflects drift, allowing detection without direct measurement or system interruption.
2Adaptability or versatility
If control opening voltage value is adjusted frequently, then adaptability is improved, but control stability deteriorates
Solution Approach 1:
The patent applies preliminary action by adjusting the control opening voltage value in advance based on detected drift trends. The controller proactively compensates for anticipated changes in the real opening voltage value by continuously adapting the control parameter before significant performance degradation occurs, rather than reacting to errors after they manifest.
Solution Approach 2:
The feedback mechanism continuously monitors control errors and their integral, automatically adjusting the control opening voltage value to maintain optimal performance. This closed-loop feedback ensures the system adapts to drift while maintaining stability through continuous, small adjustments rather than frequent large changes.
3Speed
If control bandwidth is increased, then response speed is improved, but fluid consumption increases
Solution Approach 1:
The patent implements dynamics by making the control opening voltage value variable and adaptive rather than fixed. The controller dynamically adjusts the opening voltage based on detected drift in the real opening voltage value, allowing the system to maintain optimal bandwidth and response speed while minimizing fluid consumption by using only the necessary control effort at each moment.
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
This approach enables high-performance closed-loop control by adapting the control opening voltage to changes in the real opening voltage, maintaining control quality and bandwidth while minimizing fluid consumption, even when real opening voltage values cannot be directly determined during operation.
Implementation Method 1
The piezo valve device has at least one piezo valve (6). The piezo valve (6) has an opening voltage value
Data Source
AI summary
A method for closed-loop controlling, in particular closed-loop pressure controlling, a piezo valve device, including the steps:calculating a control error integral signal representing a time integral of a control error of the closed-loop control of the piezo valve device,adjusting, based on the control error integral signal, at least one control opening voltage value defining within the closed-loop control an opening voltage value of a piezo valve of the piezo valve device, andusing the adjusted at least one control opening voltage value, providing at least one drive voltage for driving the piezo valve within the closed-loop control.