Environmental control system
AssigneeHamilton Sundstrand Corporation
InventorsBrian R. Shea, Thomas M. Zywiak, Laura Jean Coates, Michael Francis Short
Life of this patent
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Abstract
A method of controlling an outlet temperature of a heat exchanger of an aircraft includes operating an air cycle machine at a first operating speed. The air cycle machine is operatively coupled to an air cycle machine bypass valve at a first position. The air cycle machine is fluidly connected to a first heat exchanger disposed adjacent to a second heat exchanger. In response to a second heat exchanger outlet temperature less than a second heat exchanger outlet temperature threshold while the aircraft is operating at an altitude less than an altitude threshold, the method moves the air cycle bypass valve from the first position toward a second position.
Claims16
An aircraft comprising:
- a ram air duct having an inlet door;
- and
- an environmental control system including:
- a first heat exchanger and a second heat exchanger disposed within the ram air duct;
- an air cycle machine that includes a compressor fluidly connected to the first heat exchanger and the second heat exchanger;
- a temperature sensor fluidly connected to the second heat exchanger and the air cycle machine;
- an air cycle machine bypass valve fluidly connected to the first heat exchanger and the air cycle machine;
- and
- a controller programmed to, while the inlet door is at full authority, the air cycle machine is operating at a first operating speed, and the air cycle machine bypass valve is in a first position, in response to a second heat exchanger outlet temperature being less than a second heat exchanger outlet temperature threshold, increase the air cycle machine speed to a second operating speed greater than the first operating speed.
An environmental control system for an aircraft, comprising:
- an air cycle machine that includes a compressor fluidly connected to a first heat exchanger and a second heat exchanger;
- a temperature sensor disposed proximate an outlet of the second heat exchanger;
- an air cycle machine bypass valve fluidly connected to a first heat exchanger outlet, a compressor inlet, and an environmental control system outlet;
- and
- a controller in communication with the temperature sensor and the air cycle machine bypass valve, the controller programmed to, in response to a second heat exchanger outlet temperature being less than a second heat exchanger outlet temperature threshold, while the air cycle machine is operating at a first operating speed and the air cycle machine bypass valve is in a first position, move the air cycle machine bypass valve from the first position toward a second position.
A method of controlling an outlet temperature of a heat exchanger of an environmental control system of an aircraft, the method comprising:
- operating an air cycle machine at a first operating speed, the air cycle machine operatively coupled to an air cycle machine bypass valve at a first position and the air cycle machine fluidly connected to a first heat exchanger disposed proximate a second heat exchanger;
- and
- in response to a second heat exchanger outlet temperature less than a second heat exchanger outlet temperature threshold while the aircraft is operating at an altitude less than an altitude threshold, moving the air cycle machine bypass valve from the first position toward a second position.
Dependencies are inferred from the claim text.