Cabin Pressure Control System Testing With Variable-Orifice Valves
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Solution Overview
Problem
Existing cabin pressure control systems (CPCS) lack effective testing methods to evaluate their response to simulated changes in external pressure, leading to potential inaccuracies and inefficiencies in maintaining cabin pressure.
Innovation Solution
A testing system with variable-orifice valves and a digital encoder is used to simulate various pressure conditions, allowing precise control of test pressure levels and accurate evaluation of CPCS performance, reducing noise and response time, and increasing the range of testing scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If variable-orifice valves are used to control fluid flow, then measurement precision of pressure levels is improved, but device complexity increases
Solution Approach 1:
The patent employs variable-orifice valves with dynamically adjustable opening areas controlled by positioners. These positioners receive control signals and adjust the valve openings in real-time to maintain precise pressure levels, transforming static valve systems into dynamic control mechanisms that adapt to changing test conditions.
Solution Approach 2:
The testing system incorporates pressure sensors that continuously monitor the test chamber pressure and feed this information back to the controller. The controller compares actual pressure with target pressure and adjusts the variable-orifice valves accordingly, creating a closed-loop feedback system that maintains precise pressure control despite system complexity.
2Measurement precision
If digital encoder is used to convert output signals, then measurement precision of CPCS response is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical measurement and signal conversion methods with a digital encoder system. The digital encoder converts mechanical position or signal inputs into digital electrical signals that can be processed by the controller, eliminating the need for complex mechanical transducers and providing higher measurement precision with cleaner signal output.
3Object-affected harmful factors
If variable-orifice valves are used instead of ON/OFF solenoid valves, then noise in test pressure level is reduced, but device complexity increases
Solution Approach 1:
The patent replaces the binary ON/OFF state of solenoid valves with continuous variable opening areas controlled by positioners. This dynamic adjustment allows for smooth, proportional control of fluid flow, eliminating the abrupt on/off transitions that generate noise and pressure fluctuations, while the positioners provide the necessary complexity management through precise electronic control.
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 system provides precise control of pressure levels, reduces noise, and increases the accuracy of CPCS output signals, enabling thorough evaluation of CPCS performance under diverse conditions.
Implementation Method 1
The pressure controller of the testing system may include one or more variable valves connecting the test enclosure to pressure source(s) and/or vacuum source(s). The testing system may control the pressure controller to define orifices of variable sizes (e.g., variable diameters) for the valves, which may control the flow rate of a fluid into and/or out of the test enclosure
Implementation Method 2
Within the test enclosure, the CPCS may be coupled to a control system of the testing system via a digital encoder of the testing system. The digital encoder may convert output signals from the CPCS into an electrical signal and transmit the electrical signal to the control system of the testing system
Implementation Method 3
cause the pressure controller to output air from the pressure source into the enclosure through the orifice to pressurize the enclosure to a pressure level
Data Source
AI summary
A system including: a pressure controller comprising one or more valves, wherein each valve is configured to define a variable orifice, an enclosure containing a Cabin Pressure Control System (CPCS) and processing circuitry. The processing circuitry is configured to: transmit an electrical signal to the pressure controller to cause at least one valve to define an orifice, wherein a diameter of the orifice varies as a function of a voltage of the electrical signal; cause the pressure controller to output air into the enclosure through the orifice, wherein the voltage of the electrical signal controls the pressure level; and receive a signal from the CPCS indicative of one or more outputs by the CPCS in response to pressurization of the enclosure to the pressure level.