Refrigeration – Automatic control – Refrigeration producer
Reexamination Certificate
2008-07-15
2008-07-15
Jiang, Chen-Wen (Department: 3744)
Refrigeration
Automatic control
Refrigeration producer
C062S228100, C062S230000
Reexamination Certificate
active
07398653
ABSTRACT:
An inverter6that drives an electric motor4of the electric compressor3operates in a protection-against-overheat mode, in which the electric motor is driven at a rotational speed for protection against heat different from a rotational speed specifying value from an air conditioning control unit20, in order to ensure the flow rate of the refrigerant and cool the inverter itself when the temperature detected by an inverter temperature sensor22gexceeds a predetermined value. At this time, if the refrigerant pressure increases or the evaporator discharge temperature falls, the air conditioning control unit stops the protection-against-overheat mode operation of the inverter and directs the inverter to forcedly stop the electric motor. Due to this, an excessive increase in the refrigerant pressure and evaporator freezeing can be prevented, and thus the function of the refrigerating cycle can be protected.
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Homan Toshinobu
Oomura Mitsuyo
Denso Corporation
Harness Dickey & Pierce PLC
Jiang Chen-Wen
LandOfFree
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