Respiratory Flow Path Fault Detection at Variable Blower Speeds
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Solution Overview
Problem
Existing respiratory assistance systems lack an effective method to automatically detect faults in the flow path, such as disconnections, leaks, or blockages, which can affect the delivery of heated and humidified gases to the user.
Innovation Solution
A method involving sensing the flow rate at different motor speeds and comparing it against predefined thresholds to generate a fault detection signal when the flow rate exceeds or falls below specific thresholds, indicating potential issues like disconnections, leaks, or blockages in the flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If flow rate sensing and threshold comparison is implemented at multiple motor speeds, then fault detection accuracy is improved, but device complexity increases
Solution Approach 1:
The system dynamically adjusts motor speed based on detected flow conditions. When a potential fault is detected at the first motor speed, the system transitions to a second motor speed for re-sensing, creating a dynamic multi-speed detection strategy that improves accuracy without requiring continuous multi-speed operation
Solution Approach 2:
The system performs preliminary fault screening at a first motor speed before committing to more intensive detection procedures. This staged approach allows the system to quickly identify obvious faults while avoiding unnecessary complexity for normal operating conditions
2Reliability
If multi-threshold flow rate monitoring is implemented, then reliability of gas delivery is improved, but loss of time in system response increases
Solution Approach 1:
The system employs periodic flow rate sensing at different motor speeds to detect faults. By cycling through detection at the first motor speed and conditionally proceeding to the second motor speed, the system achieves thorough monitoring while maintaining a periodic rhythm that limits time loss
Solution Approach 2:
The system uses feedback from flow rate sensor readings to dynamically determine the next detection step. When flow rate exceeds or falls below thresholds at the first motor speed, the system feedback-triggers a re-sensing operation at a second motor speed, creating an adaptive response that balances reliability with time efficiency
Data Source
AI summary
A respiratory assistance apparatus is configured to provide a heated and humidified glow of gases and has a control system that is configured to detect a fault in the flow path. A flow path is provided for a gases stream through the apparatus from a gas inlet through a blower unit and humidification unit to a gases outlet. A flow rate sensor is provided in the flow path and is configured to sense the flow rate and generate an flow rate signal and/or a motor speed sensor is provided that is configured to sense the motor speed of the blower unit and generate an indicative motor speed signal.