Valve Vibration Compensation in Patient Ventilation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ventilation systems face challenges in rapidly changing setting parameters like volume flow and pressure without causing undesirable vibrations, which can lead to noise and measurement inaccuracies.
Innovation Solution
A ventilation arrangement with a valve arrangement and actuator system, where a control unit generates control and compensation signals to manage valve position and pressure, reducing vibrations through signal processing and actuator control, allowing for quick changes in setting parameters without noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the valve body is rapidly repositioned to change setting parameters like volume flow and pressure, then the response speed of the ventilation system is improved, but vibrations occur causing noise and measurement inaccuracies
Solution Approach 1:
The control unit generates a compensation signal before and during the valve repositioning action. This compensation signal is based on predetermined data about the valve's transfer characteristic, which describes how valve position changes affect the setting parameter. By applying the compensation signal in advance and during the transition, the system pre-empts the vibrations that would normally occur during rapid valve movement, thereby reducing noise and measurement errors while maintaining fast response speed
Solution Approach 2:
The system uses a feedback mechanism where the actual setting parameter (volume flow or pressure) is continuously monitored and compared to the target value. The control unit adjusts the compensation signal based on the deviation between actual and target values, ensuring that vibrations are compensated for in real-time during valve repositioning. This closed-loop feedback ensures accurate and smooth parameter transitions without the harmful effects of vibrations
Data Source
AI summary
A ventilation arrangement and a ventilation process provide ventilation for a patient. A first segment of a fluid guiding unit connects a fluid delivery unit to a valve (10). A second segment connects the valve (10) to a coupling unit on the patient side. A position of a valve body (19) of the valve (10) relative to a valve body seat (18) depends on an inlet pressure (P2) and on a control pressure (P1) and influences the volume flow (Vol′) through the second segment. An actuator (15) changes the control pressure (P1). A control signal (Sigcon) for the actuator (15) is generated with the objective of ensuring that the pressure or volume flow (Vol′) in the second segment assumes a predetermined value. A compensation signal (Sigcomp) for the actuator (15) is generated with the objective of preventing the valve body (19) from vibrating relative to the valve body seat (18).