Spring-Return Aircraft Control Knob for State Override Awareness
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Solution Overview
Problem
In aircraft with high levels of automation, the physical position of controls no longer accurately represents the state of the aircraft system, as the control system can autonomously change states independently of the switch position, leading to confusion for pilots.
Innovation Solution
A rotatable knob system with a neutral position that automatically returns, providing visual and tactile cues for the current state of the aircraft system, and an annunciator displaying the actual state, ensuring operator awareness even when overridden by another authority.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a physical switch is used to control aircraft systems, then the switch position provides awareness of system state, but in automated systems the switch position may no longer be indicative of the actual system state
Solution Approach 1:
The patent implements an annunciator that provides visual feedback displaying the actual system state, separate from the control input position. This feedback mechanism ensures pilots always know the true system state even when it differs from the commanded position due to automated overrides, directly addressing the information loss problem without adding complex control mechanisms
Solution Approach 2:
The control system is segmented into separate functional components: the control input device (knob/switch), the control system logic (including automated overrides), and the state display (annunciator). This segmentation allows each component to perform its specific function independently, resolving the contradiction by decoupling the control input from the state indication
2Reliability
If multiple controls and displays are added to maintain state awareness, then operator awareness is improved, but the device complexity increases
Solution Approach 1:
The patent combines the control input device and the state display into a single integrated control unit. The annunciator is positioned within or adjacent to the control knob, merging the functions of control input and state indication into one compact assembly. This reduces overall control panel complexity while maintaining reliable state awareness
Solution Approach 2:
The integrated control unit serves multiple functions: it accepts pilot input through the knob, processes commands through the control system, and displays the actual system state through the annunciator. This multi-functionality reduces the need for separate dedicated components, thereby reducing complexity while improving reliability
Data Source
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AI summary
Controllers and methods for enabling an operator to interface with an aircraft system are provided. A method includes receiving a first input to the aircraft system via angular displacement of a rotatable knob in a first direction away from a neutral angular position of the rotatable knob, causing the rotatable knob to automatically return to the neutral angular position, and annunciating, via the rotatable knob, a first state of the aircraft system associated with the first input. The method also includes receiving a second input to the aircraft system from a source different from the rotatable knob, and annunciating, via the rotatable knob, a second state of the aircraft system associated with the second input.