Gas Pressure Actuator Control for Volume-Compensated Positioning
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Solution Overview
Problem
Gas pressure actuators face challenges in maintaining stable positioning control due to dynamic characteristics changes depending on the position of the slider, leading to difficulties in achieving effective strokes longer than the mechanical stroke, as the pressure receiving plate's position change affects the pressure inside the pressure chambers, causing non-linear characteristics that complicate stable control.
Innovation Solution
A control method for gas pressure actuators that includes a position sensor, servo amplifiers, and a control calculation device to compensate for volume changes in the pressure chambers by adjusting position command values and switching gains based on the slider's position, ensuring stable positioning by canceling dynamic characteristics changes and matching them to the center position characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the slider position changes within the stroke, then the pressure receiving plate position changes affecting pressure chamber pressure, but this causes non-linear characteristics that complicate stable control
Solution Approach 1:
The control calculation device dynamically changes control parameters (gain values) based on the slider position within the stroke. By switching between a first gain value and a second gain value according to position, the system adapts to non-linear characteristics at different positions, maintaining stable control throughout the extended effective stroke range.
2Reliability
If the gain is switched based on slider position, then control stability is improved, but the control system complexity increases
Solution Approach 1:
The control system transitions from a static gain approach to a dynamic gain switching approach. The control calculation device automatically selects between first and second gain values based on real-time slider position detection, enabling the system to adapt to changing non-linear characteristics without requiring complex real-time calculations or multiple independent control systems.
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 stable and precise positioning control by compensating for volume and pressure changes, allowing for longer effective strokes and improved control stability by adjusting the position command values and gains, thus overcoming the limitations of non-linear characteristics.
Implementation Method 1
causing the control calculation device 20 to perform a calculation of compensating for a volume change amount of each pressure chamber caused by a positional change of the pressure receiving plate 17 inside the cylinder chamber 16
Implementation Method 2
the slider is driven by a differential pressure between the two pressure chambers by allowing compressed gas to enter and exit each of the two partitioned pressure chambers via servo valves
Data Source
AI summary
A control calculation device performs a calculation of compensating for a volume change amount of each pressure chamber caused by a positional change of a pressure receiving plate inside a cylinder chamber for each position command value applied to two servo amplifiers, outputs each of the compensated position command values to the two servo amplifiers, and executes origin positioning for a position of a slider in order to compensate for the volume change amount.