Patents Represented by Attorney, Agent or Law Firm Harness, Dickey & Pierce, PPLC
  • Patent number: 6266967
    Abstract: In a refrigerant cycle system for a vehicle air conditioner, when a continuous operation time of a compressor elapses a predetermined time after the compressor operates, operation of the compressor is forcibly interrupted so that a refrigerant pressure at a suction side of the compressor is changed. Thus, even when the compressor operates continuously in a long time when only a front evaporator operates among front and rear evaporators, the refrigerant pressure at a low-pressure side is forcibly changed so that a rear thermal expansion valve of the rear evaporator is forcibly opened. As a result, lubrication oil staying in the rear evaporator and a low-pressure pipe is introduced into the suction side of the compressor by a refrigerant flow due to a valve opening of the rear thermal expansion valve of the rear evaporator.
    Type: Grant
    Filed: March 28, 2000
    Date of Patent: July 31, 2001
    Assignee: Denso Corporation
    Inventor: Masahide Honda