Fly-By-Wire Pedal-to-Roll Coupling for Predictable Yaw Response
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Solution Overview
Problem
Fly-by-wire aircraft decoupling of yaw and roll motions poses challenges for pilots, particularly veteran pilots, who struggle to adapt to unpredictable aircraft responses and often over- or under-compensate during maneuvers like landing in high crosswinds, as existing control systems fail to replicate the natural roll rate associated with yaw commands.
Innovation Solution
A method and system that receive yaw commands, determine actual induced rolls, and send corresponding yaw and roll-countering signals to flight control components, along with a standardized roll rate command to maintain a consistent roll motion, potentially using lookup tables or calculations based on ideal conditions, and introducing delays via filters to stagger motion responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fly-by-wire technology is used to decouple yaw and roll motions, then aircraft control precision is improved, but pilot adaptability deteriorates due to unpredictable aircraft responses
Solution Approach 1:
The system dynamically adjusts the roll rate parameter based on yaw command inputs. By calculating and applying a standardized roll rate that varies with the magnitude and direction of yaw commands, the system maintains predictable aircraft responses while preserving the decoupled control architecture. This parameter adaptation allows pilots to anticipate aircraft behavior without requiring manual compensation for induced roll.
2Measurement precision
If decoupled yaw and roll control is implemented, then control signal accuracy is improved, but handling quality deteriorates due to loss of natural aircraft characteristics
Solution Approach 1:
The system pre-calculates and applies the appropriate roll rate command in anticipation of yaw maneuvers. By determining the standardized roll rate before and during yaw execution, the system ensures that the aircraft responds in a predictable and natural manner, maintaining handling quality while preserving the benefits of decoupled control signals.
3Ease of operation
If standardized roll rate command is applied, then pilot workload is reduced, but control system complexity increases
Solution Approach 1:
The system replaces complex mechanical linkages and manual pilot compensation mechanisms with an electronic control algorithm. The fly-by-wire system uses software-based calculations to determine and apply standardized roll rate commands, substituting physical complexity with computational logic that can be updated and adjusted without hardware changes.
Data Source
AI summary
The present disclosure provides methods and system for controlling the operation of a fly-by-wire aircraft. One or more yaw commands are received from an operator control, and one or more actual induced rolls rates are determined based on the yaw commands. A yaw signal and a roll-countering command are sent to flight control components of the aircraft, the yaw signal to cause a yaw motion in the aircraft, and the roll-countering command to counter the actual induced rolls. A standardized roll rate command is determined based on the yaw command, and the standardized roll rate command is sent to the flight control components to cause a roll motion in the aircraft.