US 5,699,674 AGranted

Method for controlling temperature in a chamber of a food storage apparatus

AssigneeMando Machinery Corporation

InventorsYoung-Gil Lee, Beom-Geol Ryu

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Abstract

A method for controlling temperature in a chamber of a food storage apparatus comprises: (a) inputting a lower and an upper temperature limits T1 and T2, a predetermined elapsed time t1 of the chamber storing a normal amount of food needed for the temperature of the chamber to reach T1 after an initial activating of a cooling device, a predetermined temperature restoring time t3 for the temperature of the chamber to reach T2 from an initial deactivating of the chamber, a plurality of compensating values, and a plurality of reference values; (b) setting a variable A to T1; (c) activating the cooling device; (d) measuring an elapsed time t1' for the temperature of the chamber to reach T1 after an initial activating of the cooling device; (e) comparing the elapsed time t1' with t1' (f) setting the variable A to T1' if t1' is longer than t1; (g) deactivating the cooling device at an instant when the temperature of the chamber reaches the variable A; (h) activating the cooling device again at an instant when the temperature of the chamber is increased by .DELTA.T; (i) measuring a temperature restoring time t3' from the deactivating time to the subsequent activating time of the cooling device and comparing it with t3; (j) comparing a difference .DELTA.t3 between t3' and t3 with the reference values, and setting the variable A to one of the compensating values if t3' is less than t3, otherwise setting the variable A to T1.

Claims10

Dependent claims

A method for controlling temperature in a chamber of a food storage apparatus having a cooling device, the method comprising the steps of:

(a) inputting a lower and an upper temperature limit T1 and T2, a predetermined elapsed time t1 for the temperature of the chamber storing a normal amount of food to reach the lower temperature limit T1 after the cooling device has been initially activated, a predetermined temperature restoring time t3 needed for the temperature of the chamber storing the normal amount of food to be increased by a difference .DELTA.T between the lower and the upper temperature limits T1 and T2 from an initial deactivation of the cooling device, a plurality of compensating values, and a plurality of reference values;
(b) setting a variable A to the lower temperature limit T1;
(c) activating the cooling device for cooling the chamber of the food storage apparatus;
(d) measuring an elapsed time t1' for the temperature of the chamber to reach the lower temperature limit T1 after the cooling device has been activated initially;
(e) comparing the elapsed time t1' measured with the predetermined elapsed time t1;
(f) setting the value of the variable A to one of the compensating values if the elapsed time t1' measured is longer than t1;
(g) deactivating the cooling device at an instant when the temperature of the chamber reaches the value of the variable A;
(h) activating the cooling device again at an instant when the temperature of the chamber is increased by the difference .DELTA.T;
(i) measuring a temperature restoring time t3' of the chamber from the deactivating time to the subsequent activating time of the cooling device and comparing it with the predetermined temperature restoring time t3;
(j) comparing a difference .DELTA.t3 between the temperature restoring time t3' measured and the predetermined temperature restoring time t3 with the reference values, and setting the value of the variable A to one of the compensating values if t3' is less than t3, otherwise setting the value of the variable A to the lower temperature limit T1;
and
(k) returning to step (g) if electric power to the food storage apparatus is not cut off.

9 more elements

A method for controlling temperature in a chamber of a food storage apparatus having a cooling device, the method comprising the steps of:

(a) inputting a lower and an upper temperature limits T1 and T2, a predetermined temperature restoring time t4 of the chamber storing a normal amount of food from T1 to T2 after an initial deactivation of the cooling device, a plurality of compensating values, and a plurality of reference values;
(b) setting a variable A to the lower temperature limit T1;
(c) activating the cooling device;
(d) deactivating the cooling device at an instant when the temperature of the chamber reaches the value of the variable A;
(e) activating the cooling device again at an instant when the temperature of the chamber reaches the upper temperature limit T2;
(f) measuring a temperature restoring time t4' of the chamber from T1 to T2 and comparing it with the predetermined temperature restoring time t4;
(g) comparing a difference .DELTA.t4 between the temperature restoring time t4' measured and the predetermined temperature restoring time t4 with the reference values, and setting the value of the variable A to one of the compensating values if t4' is less than t4, otherwise setting the value of the variable A to the lower temperature limit T1;
and
(h) returning step (d) if electric power to the food storage apparatus is not cut off.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/632,988Filed 16 Apr 1996
Priority: KR 95-1134710 May 1995
Granted: 23 Dec 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F25D 29/00
Arrangement or mounting of control or safety devices
G05D 23/1951
Characterised by the use of electric means: with control of the working time of a temperature controlling device
F25B 2600/0251
By controlling speed: with on-off operation
F25D 2700/12
Means for sensing or measuring; Sensors therefor: sensors measuring the inside temperature

Family

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