US Patent No: 5,425,246

Number of patents in Portfolio can not be more than 2000

Refrigerant flow rate control based on evaporator dryness

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Importance

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Abstract

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Pulse width modulation is used to control the flow rate through a solenoid expansion valve in a refrigeration system. A first temperature sensor is located near the evaporator inlet, and a second temperature sensor is disposed in a compartment to be cooled. A controller is included for controlling the duty cycle of the pulse width modulated solenoid valve. The controller receives inputs from the two temperature sensors and controls the valve duty cycle based on the difference of the two temperatures. The second temperature sensor is preferably located on the back wall of the compartment and can be adjacent to the compartment air inlet, adjacent to the compartment air outlet, or between the air inlet and air outlet.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
GENERAL ELECTRIC COMPANYSCHENECTADY, NY30861

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bessler, Warren F Schenectady, NY 20 466

Cited Art Landscape

Patent Info (Count) # Cites Year
 
EMERSON ELECTRIC CO. (1)
4,685,309 Pulse controlled expansion valve for multiple evaporators and method of controlling same 21 1986
 
GENERAL ELECTRIC COMPANY (1)
4,910,972 Refrigerator system with dual evaporators for household refrigerators 32 1989
 
HITACHI, LTD. (1)
4,653,288 Apparatus for measuring refrigerant flow rate in refrigeration cycle 25 1985
 
Kuba Kaltetechnik GmbH (1)
5,233,841 Method of optimising the performance of refrigerant vaporizers including improved frost control method and apparatus 11 1991
 
LAB-LINE INSTRUMENTS, INC. (1)
5,247,989 Modulated temperature control for environmental chamber 18 1992
 
Mydax, Inc. (1)
4,934,155 Refrigeration system 23 1989
 
SANYO ELECTRIC CO., LTD. (1)
4,745,767 System for controlling flow rate of refrigerant 52 1987
 
UUSI, LLC (1)
5,255,529 Environmental control system 42 1992
 
WHIRLPOOL CORPORATION (1)
5,255,530 System of two zone refrigerator temperature control 46 1992
 
ZEXEL CORPORATION (1)
4,677,830 Air conditioning system for automotive vehicles 49 1985
 
Other [Check patent profile for assignment information] (1)
4,651,535 Pulse controlled solenoid valve 44 1984

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
EMERSON CLIMATE TECHNOLOGIES, INC. (8)
5,628,201 Heating and cooling system with variable capacity compressor 73 1995
RE44636 Compressor capacity modulation 0 2005
RE40830 Compressor capacity modulation 6 2005
7,419,365 Compressor with capacity control 5 2006
7,654,098 Cooling system with variable capacity control 5 2006
8,157,538 Capacity modulation system for compressor and method 1 2008
8,308,455 Unloader system and method for a compressor 0 2010
8,807,961 Capacity modulation system for compressor and method 0 2012
 
GENERAL ELECTRIC COMPANY (3)
5,655,379 Refrigerant level control in a refrigeration system 46 1995
5,904,049 Refrigeration expansion control 21 1997
6,438,978 Refrigeration system 13 1998
 
SANYO ELECTRIC CO., LTD. (1)
5,598,717 Air conditioner having frost preventing member 4 1995