Hydraulic Movable Body Control with Feedback Pulse Correction
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Solution Overview
Problem
Existing CT systems face challenges in accurately and efficiently adjusting the height and inclination of movable components like tables and gantries using hydraulic motors, requiring multiple operator inputs to achieve precise positioning, which increases workload and time.
Innovation Solution
A movable body control device utilizing a cylinder and piston mechanism with a control unit that adjusts the amount of working fluid based on pulse widths to minimize deviations from target change amounts, incorporating a control signal that adapts to actual movement deviations for precise adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hydraulic motors are used to adjust table height and gantry inclination, then cost is reduced and large forces can be generated, but fine adjustment precision deteriorates and multiple operations are required to achieve target positioning
Solution Approach 1:
The control unit measures the actual movement amount of the movable body after each operation and compares it with the target change amount. Based on this feedback, the control unit calculates a corrected pulse width for subsequent operations to compensate for deviations. This feedback mechanism enables precise positioning despite using cost-effective hydraulic motors that initially produce inconsistent movement amounts.
Solution Approach 2:
The control unit dynamically adjusts the pulse width parameter based on the measured deviation between actual and target movement amounts. By changing the pulse width parameter adaptively, the system compensates for variations in hydraulic motor performance and achieves consistent positioning precision without requiring expensive precision components.
2Device complexity
If hydraulic motors with fixed valve flow rates are used, then device complexity is reduced, but adjustment time increases due to multiple operations required to reach target position
Solution Approach 1:
The control unit uses feedback from actual movement measurements to calculate corrected pulse widths, enabling the system to converge to the target position in fewer operations. This eliminates the need for complex adaptive valve control mechanisms while reducing adjustment time through intelligent pulse width modification based on measured deviations.
3Measurement precision
If valve flow rate is adjusted during manufacturing inspection to match target change amount, then initial positioning accuracy is improved, but accuracy deteriorates over time as conditions change from specified manufacturing conditions
Solution Approach 1:
Instead of relying on fixed valve flow rates calibrated during manufacturing, the control unit continuously measures actual movement amounts and adjusts pulse widths based on measured deviations. This feedback-based approach maintains consistent positioning accuracy under varying operating conditions without requiring complex adaptive valve mechanisms.
Solution Approach 2:
The control system performs self-correction by automatically adjusting pulse widths based on measured deviations. This self-service mechanism compensates for changes in hydraulic motor performance over time and under different operating conditions without requiring external recalibration or complex adaptive components.
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
The solution reduces the workload and time required for operators to achieve precise positioning of movable bodies by dynamically adjusting fluid amounts based on actual deviations, ensuring closer alignment to target values.
Implementation Method 1
The hydraulic mechanism uses valves to adjust the flow rate of the working fluid (oil)
Implementation Method 2
a control unit that generates a control signal including a first pulse width corresponding to a target change amount so that the movable body moves by the target change amount
Data Source
AI summary
A device includes a unit including a cylinder and a piston, a subject support unit that moves in accordance with relative movement of the cylinder and the piston, a control board that generates a control signal including a first pulse width based on an operation signal input by a user operation, and an oil amount adjustment unit that adjusts the amount of oil contained in the cylinder based on the first pulse width, wherein the control board determines a value of a gain based on a deviation, calculates a second pulse width based on the deviation and the determined gain value, and generates a control signal including the second pulse width when the next operation signal is input, and the oil amount adjustment unit adjusts the amount of oil in the cylinder based on the second pulse width.