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Vehicle air-conditioning system

  • US 6,923,012 B2
  • Filed: 01/20/2004
  • Issued: 08/02/2005
  • Est. Priority Date: 01/21/2003
  • Status: Expired due to Fees
First Claim
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1. A vehicle air-conditioning system of a dual air-conditioner typeprovided with a front seat air-conditioning unit for air-conditioning a front seat area in a passenger compartment and a rear seat air-conditioning unit for air-conditioning a rear seat area in the passenger compartment;

  • said front seat air-conditioning unit has arranged in it an inside/outside air switching function unit for switching between introduction of inside air and outside air, a front seat blower for blowing air introduced by said inside/outside air switching function unit toward the front seat area in the passenger compartment, and a front seat evaporator for absorbing heat from the air blown by said front seat blower for evaporation of low pressure refrigerant of a refrigeration cycle;

    said rear seat air-conditioning unit has arranged in it a rear seat blower for sucking in inside air and blowing it toward the rear seat area in the passenger compartment and a rear seat evaporator for absorbing heat from the air blown by said rear seat blower for evaporation of low pressure refrigerant of said refrigeration cycle;

    said refrigeration cycle is provided with a hot gas bypass passage for reducing the pressure of the gas refrigerant delivered from the compressor, then introducing it into said front seat evaporator;

    at the time of the cooling mode, said hot gas bypass passage is set to a closed state, the refrigerant passage at a radiator side of said refrigeration cycle is set to an open state, the gas refrigerant delivered from said compressor is introduced to said radiator, said refrigerant passed through said radiator is reduced in pressure by the front seat pressure reducing function unit and rear seat pressure reducing function unit, the low pressure refrigerant passed through said front seat pressure reducing function unit is made to evaporate by said front side evaporator, and the low pressure refrigerant passed through said rear seat pressure reducing function unit is made to evaporate by said rear seat evaporator;

    at the time of the heating mode, said hot gas bypass passage is set to an open state, the refrigerant passage at said radiator side is closed, and the gas refrigerant delivered from said compressor is directly introduced to said front side evaporator by said hot gas bypass passage to exhibit a hot gas heater function by said front seat evaporator;

    at said heating mode, said inside/outside air switching function unit is used to set an outside air mode, said front seat blower is used to blow outside air to said front seat evaporator, and, when judging conditions by which the refrigerant of said rear seat evaporator can absorb heat from the inside air at said heating mode exist, said rear seat blower is operated to blow inside air to said rear seat evaporator.

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