Digitally Augmented Pneumatic Valve Control for Precise Air Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bleed systems in aircraft, such as those for gas turbine engines, face challenges in efficiently managing and regulating compressed air pressure and flow due to inherent inaccuracies in pneumatic control systems, particularly in environments with multiple sources and varying demands.
Innovation Solution
A digitally augmented airflow control system incorporating a pneumatic controller with a lever and biasing member, and a digital controller with a torque motor, which work together to maintain precise pressure regulation by adjusting valve positions based on real-time feedback and digital set-points, compensating for pneumatic inaccuracies and ensuring stable airflow to environmental control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pneumatic control systems are used to regulate compressed air pressure, then the system can operate with simple mechanical components, but the pressure regulation accuracy deteriorates due to inherent pneumatic inaccuracies
Solution Approach 1:
The patent replaces the purely pneumatic control system with a digitally augmented system that uses electronic sensors, microprocessors, and digital algorithms to control valve positions. This substitution of mechanical/pneumatic control with electronic-digital control significantly improves pressure regulation accuracy while maintaining operational simplicity through programmable control logic.
Solution Approach 2:
The patent implements feedback control by continuously monitoring downstream pressure with sensors and using this information to adjust valve positions dynamically. The digital controller receives pressure feedback, compares it with target pressure values, and automatically adjusts the control valve to maintain accurate pressure regulation, compensating for pneumatic system inaccuracies.
2Measurement precision
If a digitally augmented control system is implemented to improve pressure regulation accuracy, then pressure control precision improves, but device complexity increases due to additional digital components
Solution Approach 1:
The patent integrates multiple functions into unified components. The digital controller serves as both the processing unit and control unit, combining sensing, computation, and actuation control in a single system. The control valve itself performs both flow regulation and pressure control functions, reducing the need for separate dedicated components and thereby limiting the increase in overall system complexity.
Solution Approach 2:
The patent merges the digital control system with the existing pneumatic control architecture by integrating digital sensors, controllers, and actuators into the conventional pneumatic flow path. This hybrid approach combines the simplicity of pneumatic components with the precision of digital control, achieving accurate pressure regulation without requiring a complete system redesign that would dramatically increase complexity.
3Adaptability or versatility
If multiple independent controllers are used to manage airflow from multiple sources, then control flexibility improves, but system complexity and coordination difficulty worsen
Solution Approach 1:
The patent introduces a master digital controller that acts as an intermediary between multiple airflow sources and the environmental control system. This central controller receives input from multiple sources, processes the combined airflow requirements, and coordinates the operation of individual control valves to achieve unified pressure and flow regulation, simplifying the coordination of multiple sources while maintaining flexibility.
Solution Approach 2:
The patent implements dynamic control where the system can adapt its operation mode based on real-time conditions. The digital controller dynamically adjusts valve positions, opens or closes sources as needed, and reconfigures the airflow paths to optimize performance. This dynamic capability provides flexibility to handle varying demands from multiple sources while the digital coordination maintains system simplicity through programmable logic.
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 enhanced control over airflow pressure and flow rate, ensuring stable and accurate regulation, even in complex environments with multiple sources, thereby optimizing the performance of aircraft environmental control systems.
Implementation Method 1
A biasing member is connected to the lever, and a biasing force of the biasing member is equal to the preload.
Implementation Method 2
a torque motor, which is operably coupled to the valve and is independently operable to adjust a position of the valve
Data Source
Figure 1
AI summary
An airflow control system includes a valve including a valve disk (26) rotatable within a flow control duct and a valve actuator connected to the valve disk. The valve actuator (34) is operable to adjust a position the valve disk. A pneumatic controller (38) is configured to regulate a pressure within the flow control duct downstream of the valve disk by adjusting the position of the valve disk when the pressure within the flow control duct downstream of the valve disk exceeds a regulation pressure set point. A torque motor (40) is fluidly connected to the valve actuator and a digital controller is operably coupled to the torque motor. The digital controller is configured to regulate the pressure within the flow control duct downstream of the valve disk independently from the pneumatic controller.