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Auxiliary power unit starting system for an aircraft

  • US 9,964,044 B2
  • Filed: 05/17/2016
  • Issued: 05/08/2018
  • Est. Priority Date: 05/18/2015
  • Status: Active Grant
First Claim
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1. An auxiliary power unit starting system for an aircraft comprising:

  • an auxiliary power unit comprising a DC starter motor to start the auxiliary power unit and a generator to provide AC power to the aircraft,a DC power network to provide power to the DC starter motor,an AC power network adapted to receive power from the generator,an electric connection line connectable between the generator and the AC power network to supply the generated power to the AC power network,a control unit configured to control the auxiliary power unit during an auxiliary power unit starting phase, and an auxiliary power unit generating phase, the auxiliary power unit starting system further comprising;

    switches to alternatively connect, through the electric connection line, the DC power network with the DC starter motor during the APU starting phase, and the generator with the AC power network, during the auxiliary power unit generating phase,wherein the control unit is configured to operate the switches to connect the DC power network with the DC starter motor by means of the electric connection line during the auxiliary power unit starting phase, and the AC power network with the generator by means of same electric connection line, during the auxiliary power unit generating phase.

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