Aircraft Air Conditioning System Adaptive Flow Control
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Solution Overview
Problem
Aircraft air conditioning systems consume excessive engine bleed airflow, leading to increased fuel consumption and decreased engine efficiency, as current systems rely on fixed airflow schedules proportional to flight altitude, failing to account for varying operational conditions and equipment performance.
Innovation Solution
An adaptive control system with a two-loop strategy that assesses aircraft operating conditions, external environment, and cooling/heating equipment performance to optimize and trim ECS airflow demand, using a 4D flow schedule map and adjusting outlet temperature to regulate airflow through a flow control valve, ensuring compliance with ventilation, pressurization, and thermal load requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fixed airflow schedules proportional to flight altitude are used, then cabin environmental conditions are maintained, but engine bleed airflow consumption is excessive
Solution Approach 1:
The patent implements dynamic airflow scheduling that adapts to real-time operating conditions including flight altitude, ambient temperature, and thermal load requirements. The system continuously adjusts the airflow schedule from fixed altitude-based values to dynamic values that account for varying environmental conditions and equipment performance, thereby optimizing engine bleed airflow consumption while maintaining cabin environmental conditions.
Solution Approach 2:
The system changes multiple parameters simultaneously including flight altitude, ambient temperature, thermal load requirements, and equipment performance characteristics to determine the optimal airflow schedule. By monitoring and responding to changes in these parameters, the system reduces engine bleed airflow consumption while ensuring cabin environmental conditions remain within acceptable ranges.
2Loss of energy
If engine bleed airflow is reduced to decrease fuel consumption, then fuel efficiency improves, but cabin pressurization and thermal load requirements may not be met
Solution Approach 1:
The patent incorporates feedback mechanisms that continuously monitor cabin pressurization levels, thermal load requirements, and ventilation conditions. The system uses this feedback to dynamically adjust the airflow schedule, ensuring that engine bleed airflow is reduced only to the extent that cabin pressurization and thermal load requirements remain satisfied. This closed-loop control approach maintains reliability while optimizing fuel consumption.
Solution Approach 2:
The system performs preliminary assessments of thermal load requirements and cabin pressurization needs before determining the optimal airflow schedule. By evaluating these requirements in advance and using a comprehensive 4D airflow schedule that considers flight altitude, ambient temperature, and thermal load characteristics, the system ensures that fuel-efficient airflow reductions do not compromise cabin pressurization or ventilation compliance.
3Use of energy by moving object
If adaptive control with multiple parameters is implemented, then engine bleed airflow is optimized, but system complexity increases
Solution Approach 1:
The patent segments the complex adaptive control system into manageable components including a sensor subsystem for monitoring operating conditions, a processing subsystem for evaluating thermal load requirements and determining optimal airflow schedules, and an actuator subsystem for adjusting airflow control valves. This segmentation allows the sophisticated 4D airflow optimization to be implemented through coordinated simple subsystems rather than a single complex unit.
Solution Approach 2:
The system introduces an intermediary airflow schedule database that stores pre-calculated optimal airflow values based on flight altitude, ambient temperature, and thermal load conditions. This intermediary layer translates complex multi-parameter inputs into simplified control signals for airflow adjustment, reducing the computational burden on the control system while maintaining optimization benefits.
Data Source
AI summary
An environmental control system for an aircraft uses engine bleed air for cabin environment control. The environment control system regulates the inlet airflow by assessing a plurality of parameters that provides, but not limited to, the aircraft operating conditions and external environment data, aiming at substantially reducing the extracted engine bleed air demand for cabin environment control and fuel consumption reduction and concurrently complying with aircraft pressurization, ventilation and thermal load requirements. The environmental control system airflow target is calculated based on the actual aircraft operating conditions, external environment data and a multi-dimensional airflow schedule map. Then, environmental control system airflow target is further trimmed based on the actual aircraft operating conditions and air conditioning system performance capabilities by fixing the air conditioning airflow outlet temperature and then regulating the air conditioning inlet mass airflow through the flow control valve. The first control method reduces and the second one trims the environmental control system airflow target comparing to conventional control methods. Thus, fuel consumption reduction is obtained when the environment control system airflow target (extracted bleed air demand) can be reduced and or trimmed depending on flight conditions.