Vehicle air conditioning and heating method providing engine on and engine off operation

  • US 7,448,227 B2
  • Filed: 01/23/2006
  • Issued: 11/11/2008
  • Est. Priority Date: 04/29/2002
  • Status: Active Grant
First Claim
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1. A method of operating an air conditioning system for a vehicle having an engine to provide air conditioning to a sleeping area of the vehicle having an electric power generation and storage system, comprising the steps of:

  • drawing electric power from the electric power generation and storage system when the engine is operating to drive an electrically driven, variable-speed compressor to cool the vehicle;

    drawing electric power from the electric power generation and storage system when the engine is not operating to drive the electrically driven, variable-speed compressor to cool the vehicle;

    disabling operation of the electrically driven, variable-speed compressor when an output of the electric power generation and storage system drops below a threshold; and

    determining a starting power requirement threshold of the vehicle'"'"'s engine, and wherein the step of disabling operation of the electrically driven, variable-speed compressor when the output of the electric power generation and storage system drops below the threshold comprises the step of disabling operation of the electrically driven, variable-speed compressor before the output voltage of the electric power storage system drops below the starting power requirement threshold of the vehicle'"'"'s engine.

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