Abstract: 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.

Abstract: An air conditioning system for an aircraft regulates the extracted engine bleed airflow by assessing a plurality of parameters that indicate the actual aircraft operating conditions, external environment and system performance capabilities, aiming at substantially reducing the demand of extracted engine bleed air (fuel consumption reduction) and concurrently complying with pressurization, ventilation and thermal load requirements. The ECS airflow is optimized based on the aircraft operating conditions and external environment. Then, ECS airflow is further optimized based system performance capabilities by fixing the air conditioning system outlet temperature to lower or higher values and then regulating the ECS airflow through the flow control valve to still meet the thermodynamic performance required to properly maintain the aircraft cabin environment.

Abstract: A simplified air bleed balancing control system for a pair of aircraft gas turbine engines reduces the number of pressure transducers and differential pressure transducers. Advantages include lower weight, less expensive system, better total system MTBF (mean time before failure), acceptable differential pressure transducer drift identification and compensation by the digital controller, and fewer maintenance tasks.

Abstract: A simplified air bleed balancing control system for a pair of aircraft gas turbine engines reduces the number of pressure transducers and differential pressure transducers. Advantages include lower weight, less expensive system, better total system MTBF (mean time before failure), acceptable differential pressure transducer drift identification and compensation by the digital controller, and fewer maintenance tasks.