APU Inlet Door Anticipatory Control for Startup Time
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems for auxiliary power unit (APU) inlet doors require unnecessary time to prepare for startup due to delayed movement after receiving a start command, as they only open after confirming the absence of inhibiting conditions.
Innovation Solution
A method and system that determine the presence of inhibiting conditions for APU startup, allowing the inlet door to open in advance if no conditions are present, and close if startup is inhibited, using a processing unit and memory to generate door-opening or door-closing signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inlet door opens only after confirming no inhibiting conditions are present, then safety is improved, but startup time increases
Solution Approach 1:
The inlet door is commanded to open in advance of the APU start command being received, based on predictive logic that anticipates the start sequence. This preliminary action reduces startup time while maintaining safety through subsequent verification that no inhibiting conditions are present before the door remains open.
2Productivity
If the inlet door opens in advance of the start command, then productivity is improved, but risk of harmful factors increases
Solution Approach 1:
The inlet door opens in advance based on predictive logic that anticipates the APU start sequence, improving productivity. The system commands the door open before the start command is received, reducing startup time while maintaining safety through verification that no inhibiting conditions are present.
Solution Approach 2:
The control system continuously monitors for inhibiting conditions and uses feedback to determine whether the inlet door should remain open or close. This feedback mechanism ensures that even though the door opens in advance for productivity, safety is maintained by closing the door if harmful conditions are detected during the startup sequence.
Data Source
AI summary
A system and method for controlling an inlet door of an auxiliary power unit (APU) are provided. It is determined whether a condition to inhibit a start of the APU is present. If no condition to inhibit the start of the APU is present, a door-opening signal comprising instructions to cause the inlet door to be commanded to an open position in advance of a prospective command to start the APU is output. If the condition to inhibit the start of the APU is present, a door-closing signal comprising instructions to cause the inlet door to be commanded to a closed position is output.