CONTROL METHOD OF REFRIGERATOR

• US 20110041525A1
• Filed: 11/04/2008
• Published: 02/24/2011
• Est. Priority Date: 11/05/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Dong-Seok, Kang, Sung-Hee, Roh, Chulgi, Youn, Deok-Hyun, Shin, Jong-Min
• Granted Patent: US 8,640,470 B2
• Time in Patent Office: Days
• US Class Current: 62/89
• CPC Class Codes: F25B 2600/0251 with on-off operation
• CPC Class Codes: F25B 2600/112 of evaporator fans
• CPC Class Codes: F25B 2600/2511 Evaporator distribution valves
• CPC Class Codes: F25B 2700/2117 of an evaporator
• CPC Class Codes: F25B 5/02 arranged in parallel
• CPC Class Codes: F25D 11/022 with two or more evaporators
• CPC Class Codes: F25D 17/065 with compartments at different temperatures
• CPC Class Codes: F25D 21/02 Detecting the presence of frost or condensate
• CPC Class Codes: F25D 2600/02 Timing
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

The present invention relates to a control method of a refrigerator which operates a cooling cycle including two storage compartments, a compressor, a condenser, a valve, fans, and evaporators for cooling the respective storage compartments, with one of the fans (5) corresponding to the storage compartment for storing items at relatively low temperatures being activated for a set amount of time even after the compressor is deactivated at the completion of cooling of the storage compartment for storing items at relatively low temperatures. In a refrigerator comprising a first storage compartment for storing an item, a second storage compartment for storing an item at a lower temperature than the first storage compartment, a cooling cycle including a compressor, a condenser for condensing a refrigerant from the compressor, a valve for directing the refrigerant from the condenser to first and second evaporators, with the first and second evaporators evaporating supplied refrigerants to cool the first and second storage compartments, respectively, and first and second (5) fans for circulating cool air from the first and second evaporators, respectively, and a controller for controlling the first and second (5) fans, the valve and the compressor, a control method of the refrigerator comprising: a first step of the controller activating the compressor if cooling of the second storage compartment is required and activating the second fan (5); and a second step of the controller deactivating the operation of the compressor, if the cooling of the second storage compartment is completed, and deactivating the operation of the second fan (5) after the operation of the compressor is deactivated.

Claims

1. In a refrigerator comprising a first storage compartment for storing an item, a second storage compartment for storing an item at a lower temperature than the first storage compartment, a cooling cycle including a compressor, a condenser for condensing a refrigerant from the compressor, a valve for directing the refrigerant from the condenser to first and second evaporators, with the first and second evaporators evaporating supplied refrigerants to cool the first and second storage compartments, respectively, and first and second fans for circulating cool air from the first and second evaporators, respectively, and a controller for controlling the first and second fans, the valve and the compressor, a control method of the refrigerator comprising:

a first step of the controller activating the compressor if cooling of the second storage compartment is required and activating the second fan; and

a second step of the controller deactivating the operation of the compressor, if the cooling of the second storage compartment is completed, and deactivating the operation of the second fan after the operation of the compressor is deactivated.

2. The control method according to claim 1, wherein the second step includes the controller deactivating the operation of the second fan, if a temperature difference between the first evaporator and the second evaporator sensed by a sensing unit is below a predetermined level.

3. The control method according to claim 1, wherein the second step includes the controller deactivating the operation of the second fan, after elapse of a preset time from the deactivation of the compressor.

4. The control method according to claim 1, wherein the first step includes a step of:

deciding whether the second storage compartment needs to be cooled off.

12. The control method according to claim 2, wherein the second step includes the controller deactivating the operation of the second fan, after elapse of a preset time from the deactivation of the compressor.

13. The control method according to claim 2, wherein the first step includes a step of:

deciding whether the second storage compartment needs to be cooled off.

14. The control method according to claim 3, wherein the first step includes a step of:

deciding whether the second storage compartment needs to be cooled off.

5. A refrigerator, comprising:

a first storage compartment for storing an item and a second storage compartment for storing an item at a lower temperature than the first storage compartment;

a cooling cycle including a compressor, a condenser for condensing a refrigerant from the compressor, a valve for directing the refrigerant from the condenser to first and second evaporators, with the first and second evaporators evaporating supplied refrigerants to cool the first and second storage compartments, respectively, first and second fans for circulating cool air from the first and second evaporators, respectively; and

a controller for performing a cooling operation on each of the first and second storage compartments and, after the cooling of the second storage compartment is completed, immediately deactivating the operation of the compressor and then deactivating the operation of the second fan after the operation of the compressor is deactivated.

6. The refrigerator according to claim 5, comprising:

sensing units for sensing temperatures of the first and second evaporators.

7. The refrigerator according to claim 5, wherein the controller comprises:

a timer for checking elapsed time to decide if cooling has been completed.

8. The refrigerator according to claim 5, wherein if the cooling of the second storage compartment has been completed, the controller deactivates the operation of the compressor immediately and then deactivates the operation of the second fan if a temperature difference between the first evaporator and the second evaporator sensed by the sensing unit is below a predetermined level.

9. The refrigerator according to claim 5, comprising:

a defrost sensor for sensing whether the first evaporator and/or the second evaporator is frosted.

10. The refrigerator according to claim 9, wherein the defrost sensor is a sensor having a variable resistance in response to temperatures in high- and low-temperature evaporators.

11. The refrigerator according to claim 9, comprising:

a defrost heater for applying heat to the evaporators to get rid of frost generated thereon.

15. The refrigerator according to claim 6, wherein the controller comprises:

a timer for checking elapsed time to decide if cooling has been completed.

16. The refrigerator according to claim 6, wherein if the cooling of the second storage compartment has been completed, the controller deactivates the operation of the compressor immediately and then deactivates the operation of the second fan if a temperature difference between the first evaporator and the second evaporator sensed by the sensing unit is below a predetermined level.

17. The refrigerator according to one of claim 7, wherein if the cooling of the second storage compartment has been completed, the controller deactivates the operation of the compressor immediately and then deactivates the operation of the second fan if a temperature difference between the first evaporator and the second evaporator sensed by the sensing unit is below a predetermined level.

18. The refrigerator according to claim 6, comprising:

a defrost sensor for sensing whether the first evaporator and the second evaporator is frosted.

19. The refrigerator according to claim 7, comprising:

a defrost sensor for sensing whether the first evaporator and the second evaporator is frosted.

20. The refrigerator according to claim 8, comprising:

a defrost sensor for sensing whether the first evaporator and the second evaporator is frosted.

21. The refrigerator according to claim 10, comprising:

a defrost heater for applying heat to the evaporators to get rid of frost generated thereon.

22. The refrigerator according to claim 6, comprising:

a defrost sensor for sensing whether the first evaporator or the second evaporator is frosted.

23. The refrigerator according to claim 7, comprising:

a defrost sensor for sensing whether the first evaporator or the second evaporator is frosted.

24. The refrigerator according to claim 8, comprising:

a defrost sensor for sensing whether the first evaporator or the second evaporator is frosted.