Synthesized low-pressure bleed air scheme for aircraft bleed air network

An aircraft environmental control system (ECS) comprising:

• an airflow network including:
• a high-pressure bleed air duct configured to receive high-pressure bleed air generated by at least one aircraft engine;
• a low-pressure bleed air duct configured to receive low pressure bleed air generated by the at least one aircraft engine;
• at least one air condition unit configured to generate temperature-regulated air based on either the high-pressure bleed air or the low pressure bleed air;
• at least one valve configured to operate in a first position to output the high-pressure bleed air to the air conditioning unit, and a second position to output the low-pressure bleed air to the air conditioning unit;
• and
• an electronic ECS controller in signal communication with the airflow network, the electronic ECS controller configured to calculate a synthesized low-pressure value associated with the low-pressure bleed air, and to adjust a position of the at least one valve based on the synthesized low-pressure value.

A method of controlling an aircraft environmental control system (ECS), the method comprising:

• selectively generating high-pressure bleed air and low-pressure bleed air using at least one engine installed on an aircraft;
• delivering at least one of the high-pressure bleed air and the low pressure bleed air to an air conditioning unit installed on the aircraft;
• calculating, via electronic ECS controller, a synthesized low-pressure value associated with the low-pressure bleed air while delivering the high pressure bleed air to the air conditioning unit;
• and
• switching from delivering the high pressure bleed air to the air conditioning unit to delivering the low-bleed pressure air to the air conditioning unit while blocking flow of the high-pressure bleed air through the ECS based on the synthesized low-pressure value.