Gas Pressure Apparatus Volume Calculation via Flow Integration
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Solution Overview
Problem
Conventional methods for calculating the moved position and movement amount of a piston in a hydraulic cylinder cannot determine the initial position of the piston when it is not at one of the displacement end positions, leading to an inability to calculate the volume of the working chamber in such cases.
Innovation Solution
A method involving a gas-pressure-driven apparatus with a pressure sensor and flow rate sensor, where the volume of the working chamber is made unchangeable, and the pressure is altered to calculate the initial volume based on pressure changes and integrated flow rates, allowing for the determination of both initial and post-change volumes irrespective of the piston's initial position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the piston initial position is not at displacement end positions, then the conventional monitoring method cannot determine the initial position, but the present invention enables accurate calculation of working chamber volume through pressure change and integrated flow rate measurement
Solution Approach 1:
The system performs preliminary calibration by integrating flow rate from a known initial state to establish baseline volume information, enabling subsequent position calculations even when the piston starts at an intermediate position. This preliminary flow integration stores the necessary volume reference data before normal operation begins.
Solution Approach 2:
The invention introduces pressure change as an intermediary parameter to indirectly determine the working chamber volume. By measuring pressure changes in response to known flow rate integrations, the system can calculate initial volume without directly measuring the piston's initial position, thus using pressure as a mediator to bridge the measurement gap.
2Measurement precision
If the piston is at an intermediate position, then the conventional method cannot calculate the moved position, but the present invention calculates volume based on pressure change amount and integrated flow rate
Solution Approach 1:
The system utilizes pneumatic principles by measuring pressure changes in the working chamber in response to controlled gas flow. The pressure sensor detects pressure variations caused by gas injection or discharge, and these pressure changes are correlated with volume changes through the ideal gas law, enabling volume calculation without mechanical position sensors.
Solution Approach 2:
The invention replaces direct mechanical position measurement with a pneumatic-field-based measurement system. Instead of using mechanical encoders or position sensors on the piston, the system uses pressure sensors and flow rate sensors to indirectly measure volume changes through gas law relationships, substituting mechanical measurement with field-based measurement.
3Reliability
If conventional flow rate integration is used, then intermediate positions can be detected, but the initial position cannot be determined when not at end positions
Solution Approach 1:
The system employs feedback by continuously monitoring both flow rate and pressure, and using the pressure feedback to validate and refine the volume calculations. The pressure measurement provides real-time feedback on the actual chamber state, allowing the system to correct and verify the integrated flow rate calculations, ensuring accurate initial position determination.
Solution Approach 2:
The invention changes the measurement parameter from direct position measurement to pressure measurement. By measuring pressure changes in response to controlled flow rate integrations, the system transforms the measurement approach from spatial (position) to thermodynamic (pressure), enabling initial position determination through parameter transformation.
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
Enables accurate calculation of the initial and post-change volumes of the working chamber, ensuring precise control and operation of the gas-pressure-driven apparatus regardless of the piston's initial position, by correlating pressure changes with integrated flow rates.
Implementation Method 1
a pressure sensor for detecting a pressure of a space including the working chamber
Implementation Method 2
a flow rate sensor for detecting a flow rate of the working gas flowing into and flowing out of the working chamber
Implementation Method 3
a movable member which moves relative to the main body in accordance with a pressure of the working chamber
Data Source
AI summary
A gas-pressure-driven apparatus includes a main body having a working chamber, a movable member moving relative to the main body with a pressure of the working chamber, a pressure sensor for detecting the pressure, a flow rate sensor for detecting the flow rate of the working gas. A method for controlling the apparatus includes calculating a pressure change amount from the detected pressure and an integrated flow rate from the detected flow rate when the pressure is changed in a state in which the volume of the working chamber cannot be changed, calculating an initial volume of the working chamber from the pressure change amount and the integrated flow rate, and calculating a post-change volume of the working chamber from the integrated flow rate and the initial volume after creation of a state in which the volume of the working chamber can be changed from the initial volume.