Aircraft Engine Thrust Imbalance Control Logic
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing energy protecting devices for aircrafts face safety issues due to thrust unbalance caused by engine failures, leading to reduced availability of protective functions when any single engine fails, which compromises aircraft safety and control.
Innovation Solution
The energy protecting device inhibits the protective function only when all engines on a common wing fail, and controls remaining engines to minimize thrust unbalance, allowing continued operation with single or non-simultaneous engine failures, thereby maintaining safety and expanding the device's field of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective function is inhibited as soon as one engine fails, then thrust unbalance and yaw movement are avoided, but the availability of the protective device is greatly reduced
Solution Approach 1:
The patent applies local quality by differentiating the inhibition logic based on engine position and failure pattern. The protective function is inhibited only when all engines on a common wing fail, not for isolated engine failures. This localized approach to inhibition maintains thrust balance when truly necessary while preserving protective function availability for other failure scenarios.
Solution Approach 2:
The patent segments the engine failure scenarios into distinct categories: single engine failure, dual engine failure on same wing, and dual engine failure on different wings. Each segment has its own inhibition logic, allowing the system to maintain protective function where appropriate while preventing thrust unbalance only in critical same-wing dual failure scenarios.
2Power
If maximum thrust is generated on all engines when protective function is activated, then energy protection is provided, but thrust unbalance occurs when one engine has failed
Solution Approach 1:
The patent applies asymmetry by allowing asymmetric thrust distribution when engines have failed. The control means generate maximum thrust on remaining functional engines while accepting or compensating for the asymmetric thrust configuration, rather than enforcing symmetric thrust on all engines regardless of failure status.
Solution Approach 2:
The patent implements dynamic thrust control where the protective function adapts its behavior based on real-time engine status. When engine failure is detected, the system dynamically adjusts which engines receive maximum thrust commands, transitioning from a static all-engines-maximum-thrust approach to a dynamic selective maximum thrust approach.
Data Source
AI summary
An energy protecting device for three and four-engined aircraft includes a detecting unit configured to detect failure of each engine. A control unit is configured to provide a protective function by controlling maximum thrust of each engine. A triggering unit is configured to monitor a plurality of parameters and trigger the control unit to provide maximum thrust at predetermined conditions of the monitored parameters. An inhibiting unit is linked to the triggering unit and is configured to inhibit the protective function, when at least one of the engine on the wings of the aircraft has failed. The control unit is also configured to control the engines that have not failed to minimize thrust imbalance.


