Refrigeration – Automatic control – Refrigeration producer
Patent
1987-01-27
1989-01-03
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
62184, 62227, 622283, F25B 4100
Patent
active
047947624
ABSTRACT:
A refrigeration control system for cooling a vehicle passenger compartment having a compressor/pump for circulating refrigerant between an evaporator located for cooling the compartment air and a condenser located for ambient heat exchange. An expansion valve controls refrigerant flow from the condenser to the evaporator; and, a first thermistor senses directly the temperature of the refrigerant on the high pressure inlet side of the valve and a second thermistor senses refrigerant flow temperature on the low pressure discharge side of the valve. A microprocessor compares the first thermistor output with predetermined first upper and lower values and effects opening and closing of the compressor clutch switch for high pressure cut-off; and, a fan switch is opened and closed for energization and de-energization of a condenser cooling fan. The output of the second thermistor is compared with a second set of upper and lower limit values for responding to normal service duty cycling of the clutch; and, the microprocessor is effective upon sensing a predetermined temperature after an elapsed time interval to open the clutch switch in the event of low or insufficient refrigerant charge.
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Barthel Richard C.
Malone Peter J.
Orth Charles D.
Eaton Corporation
Johnston R. A.
Tanner Harry B.
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