APU selective cool down cycle

  • US 9,188,065 B2
  • Filed: 08/03/2011
  • Issued: 11/17/2015
  • Est. Priority Date: 08/03/2011
  • Status: Active Grant
First Claim
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1. An auxiliary power unit (APU) comprising:

  • a compressor for compressing air and delivering compressed air into a combustion chamber, the air being mixed with fuel and combusted in the combustion chamber, and passed over a turbine, said turbine driving a generator to generate electricity;

    a control for controlling a load on the APU from an associated aircraft, said control receiving a shut down signal indicative of a shut-down of the APU, said control further receiving information with regard to a temperature challenge around the APU, and if the temperature challenge exceeds a predetermined threshold, then said control operating said APU with the load reduced in a cool down cycle to reduce a heat load from the APU on a tail cone of the associated aircraft prior to shut down of the APU;

    a sensor for sensing the temperature challenge and sending the information,the temperature challenge being, indicative of a potential of heat damaged to the tail cone, with the tail cone being formed of carbon fiber;

    said sensor being inside of said tail cone, and outside of said APU.

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