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Air conditioning system

  • US 5,775,415 A
  • Filed: 07/07/1994
  • Issued: 07/07/1998
  • Est. Priority Date: 07/07/1993
  • Status: Expired due to Term
First Claim
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1. A system for air conditioning a cabin of a vehicle to be air conditioned, the system comprising:

  • (a) a duct for introducing a flow of the air into the cabin;

    (b) a refrigerating circuit for a refrigerant having a compressor and an evaporator arranged in the duct to contact the air flow in the duct, so that a heat exchange occurs between the refrigerant in the evaporator and the air in the duct;

    (c) heating means arranged in the duct for contacting with the air flow for heating the cooled air from the evaporator;

    (d) means, responsive to a manipulation by a passenger, for issuing, selectively, a first signal for energizing the compressor and for issuing a second signal for de-energizing the compressor;

    (e) means for detecting at least one environmental parameter related to a temperature of the cabin;

    (f) means for setting a desired cabin temperature;

    (g) means, for calculating a calculated target air temperature of the air discharged into the cabin from the duct, said calculating being based on the detected environmental parameter and on the desired cabin temperature;

    (h) means for detecting a physical parameter related to the temperature of air outside the cabin;

    (i) means for calculating a corrected target air temperature so that the calculated target air temperature is reduced by a predetermined value when the compressor is de-energized by the second signal, whereby the value of the corrected target air temperature when the compressor is de-energized by the second signal is less than the value of the target air temperature when the compressor is energized by the first signal;

    (j) means for controlling the heating means so that;

    (A) the corrected target air temperature is obtained when the value of the detected outside air temperature is not smaller than a predetermined value; and

    (B) the calculated target air temperature is obtained when the value of the detected outside air temperature is smaller than the predetermined value.

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