초록 ▼

A method for detecting a refrigerant charge in an air conditioning system. A charge detection device is connected to the air conditioning system that is operated to produce cooling air. The input temperature and pressure are measured from sensors in the air conditioning system. The charge detection

A method for detecting a refrigerant charge in an air conditioning system. A charge detection device is connected to the air conditioning system that is operated to produce cooling air. The input temperature and pressure are measured from sensors in the air conditioning system. The charge detection device determines an actual sub cooling value of the air conditioning system from the input temperature and pressure. A desired sub cooling value is then assigned based on the ambient temperature and humidity of the air in which the air conditioning system is operating. The desired sub cooling value is obtained from a database in the charge detection device. The database stores predetermined sub cooling values at an optimum charge for a fixed compressor rpm, a fixed evaporator airflow and various ambient conditions encountered during normal operation. The charge detection device selects the desired sub cooling value according to the specific ambient temperature and humidity during operation of the air conditioning system. The actual sub cooling value is than compared to the desired sub cooling value. The difference between the actual sub cooling value and the desired sub cooling value is compared to the acceptable predetermined sub cooling value range. If the difference is outside of the range, the user is informed that the air conditioning system requires service.

대표청구항 ▼

[ What is claimed is:] [1.] A method for detecting a refrigerant charge in an air conditioning system comprising: providing an air conditioning system comprising a compressor, an engine for driving the compressor, a condenser, an expansion valve, an evaporator, a blower including a motor and a fan f

[ What is claimed is:] [1.] A method for detecting a refrigerant charge in an air conditioning system comprising: providing an air conditioning system comprising a compressor, an engine for driving the compressor, a condenser, an expansion valve, an evaporator, a blower including a motor and a fan for blowing air out of the air conditioning system, conduits for coupling together the compressor, the condenser, the expansion valve and the evaporator to define a closed air conditioning system, and a fluid flowing through the conduits, wherein said closed air conditioning system produces a refrigerant charge for the air conditioning system at the system operating temperature and pressure, said method comprising:connecting a charge detection device to the air conditioning system;operating the air conditioning system to produce cooling air;measuring an input temperature and pressure from sensors positioned between the condenser and the expansion valve in the air conditioning system;determining an actual sub cooling value from said measured input temperature and pressure;assigning a desirable sub cooling value obtained from predetermined sub cooling values stored in a data base in the charge detection device, said desired sub cooling values being selected based on ambient temperature and humidity during said operation of said air conditioning system;comparing the actual sub cooling value with the desirable sub cooling value; anddetermining the difference between the actual sub cooling value and the desirable sub cooling value during operation of the air conditioning system and if the difference between the values is outside of an acceptable predetermined range, informing a user that the air conditioning system requires service.