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
Stats
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Jun 20, 1995
Issued date -
Apr 4, 1994
filing date -
08/222,052
serial no -
Expired
status
Importance
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Abstract
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
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,685,309 Pulse controlled expansion valve for multiple evaporators and method of controlling same | 19 | 1986 | |
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| 4,910,972 Refrigerator system with dual evaporators for household refrigerators | 32 | 1989 | |
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| 4,653,288 Apparatus for measuring refrigerant flow rate in refrigeration cycle | 25 | 1985 | |
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| 5,233,841 Method of optimising the performance of refrigerant vaporizers including improved frost control method and apparatus | 8 | 1991 | |
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| 5,247,989 Modulated temperature control for environmental chamber | 16 | 1992 | |
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| 4,934,155 Refrigeration system | 16 | 1989 | |
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| 4,745,767 System for controlling flow rate of refrigerant | 47 | 1987 | |
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| 5,255,529 Environmental control system | 40 | 1992 | |
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| 5,255,530 System of two zone refrigerator temperature control | 44 | 1992 | |
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| 4,677,830 Air conditioning system for automotive vehicles | 43 | 1985 | |
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| 4,651,535 Pulse controlled solenoid valve | 42 | 1984 | |