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Integrated and Modular Systems for Commercial ... - Nonstop Systems

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Signal Inputs:<br />

• air data<br />

• heat load on/off<br />

• load shedding<br />

• throttle setting<br />

• air/gnd status<br />

• fuel/coolant temp<br />

• flow/temp/press<br />

dem<strong>and</strong><br />

lliedSignal<br />

A E R O S P A C E<br />

Typical Environmental Control System<br />

Sub-system Functions:<br />

• engine starting<br />

• bleed-air temp/press regulation<br />

• cabin pressure<br />

• cabin cooling<br />

• anti-ice, de-ice, de-fog<br />

• cooling hydr/electr/mech power devices<br />

• avionics cooling<br />

Signal Outputs:<br />

• valve drives<br />

• actuator drives<br />

• temp/flow/press<br />

• fault/warning<br />

• fuel flow recirc.<br />

dem<strong>and</strong><br />

Internal Sensors: Internal Actuators:<br />

Physical Inputs:<br />

• bleed/APU air<br />

• hydr fluid/coolant<br />

• electr. power<br />

• pneum. servo pwr<br />

• ram air<br />

• fuel<br />

• temperature<br />

• pressure<br />

• air flow<br />

• fluid flow<br />

• humidity<br />

• angular speed<br />

• ang./lin. position<br />

• valves<br />

– motor<br />

– solenoid<br />

• compressors<br />

– motor, turbine<br />

– air-fan<br />

• fluid pump<br />

• other EM devices<br />

Physical Outputs:<br />

• air flow at suitable<br />

temp & press<br />

• coolant flow at<br />

suitable temp &<br />

press<br />

• O2, N2 flow<br />

• APU air<br />

- multi-variable, multi-channel control -<br />

4

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