Refrigeration – Automatic control – Refrigeration producer
Reexamination Certificate
2005-10-14
2010-11-30
Jules, Frantz F. (Department: 3744)
Refrigeration
Automatic control
Refrigeration producer
C062S129000, C062S323100, C062S244000
Reexamination Certificate
active
07841197
ABSTRACT:
A variable capacitance compressor is provided in a refrigeration cycle of a vehicular air conditioning system. The variable capacitance compressor controls discharge capacity of refrigerant by an external control pulse signal, and can substantially estimate compressor suction side pressure by the external control pulse signal and compressor discharge side pressure. A compressor torque calculator is provided to calculate torque based on evaporator upstream and downstream temperature difference data Δt, which is a temperature difference between inlet side air temperature of an evaporator and outlet side air temperature of the evaporator, compressor discharge side pressure data Pd, duty ratio data of a control pulse signal, and compressor's number of revolution data.
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Calsonic Kansei Corporation
Foley & Lardner LLP
Jules Frantz F.
Rahim Azim
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