Refrigerator and temperature measurement error correcting method of infrared sensor

Patent metadata

Field	Value
Publication number	US-10712758-B2
Application number	US-201615737757-A
Country	US
Kind code	B2
Filing date	Jun 17, 2016
Priority date	Jun 26, 2015
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

Provided are a refrigerator, and a method for correcting temperature measurement errors of an infrared sensor including: verifying that the infrared sensor is running in an operating state; obtaining a measured operating-state value acquired by the infrared sensor sensing the temperature of a preset zone; obtaining a correction constant corresponding to the infrared sensor, the correction constant being obtained by means of a comparison between the value measured by the infrared sensor in a correction state and a standard temperature value; using the correction constant to correct the measured value and thus obtain a corrected temperature value. Using the method, the impact of an absolute error of the infrared sensor on temperature measurement is reduced; thus the accuracy of temperature measurement is improved, such that measured values directly reflect the actual temperature of the items inside a preset zone, and an accurate basis for control is provided for subsequent associated control.

First claim

What is claimed is:

1. A temperature measurement error correcting method of an infrared sensor of a refrigerator, comprising:
confirming that the infrared sensor is running in an operation status of the refrigerator;
acquiring a measured value in the operation status by sensing a temperature of a preset region via the infrared sensor;
acquiring a correction constant corresponding to the infrared sensor, by comparing a measured value sensed by the infrared sensor in a correction status of the refrigerator with a standard temperature, wherein the correction status is making an implementation during a first power test after assembly of the refrigerator, and in the correction status, ensuring a door body of the refrigerator is closed and all components in a refrigeration system thereof are disabled; and
correcting the measured value in the operation status with the correction constant so as to acquire a corrected temperature.

2. The method of claim 1 , wherein acquiring the correction constant by comparison comprises:
acquiring a trigger signal for entering the correction status, and disabling at least one component which affects the temperature of the preset region so as to enter the correction status;
respectively acquiring the measured value sensed by the infrared sensor in the correction status and the standard temperature measured by a standard temperature measuring device arranged in the preset region;
calculating a difference between the measured value in the correction status and the standard temperature; and
taking the difference as the correction constant.

3. The method of claim 2 , wherein acquiring the measured value sensed by the infrared sensor in the correction status comprises:
collecting a sensing result of the infrared sensor in the correction status once every first predetermined time so as to acquire a correction sampling value;
successively acquiring a first predetermined number of the correction sampling values and removing a maximum correction sampling value and a minimum correction sampling value from the acquired correction sampling values; and
calculating an average value of the remaining correction sampling values after removing the maximum correction sampling value and the minimum correction sampling value, as the measured value sensed by the infrared sensor in the correction status.

4. The method of claim 3 , after acquiring the correction sampling values, further comprising:
determining whether the correction sampling values are within a preset normal value interval;
if yes, sequentially storing the correction sampling values in a preset correction sampling value queue according to sampling time, wherein a length of the correction sampling value queue is equal to the first predetermined number; and
if not, setting the correction sampling values as invalid data and removing the same, and outputting a prompt signal indicating abnormality of correction measurement when all the successive first predetermined number of temperature sampling values are invalid data.

5. The method of claim 2 , wherein acquiring the standard temperature comprises:
collecting a sensing result of the standard temperature measuring device once every second predetermined time so as to acquire a standard sampling value;
successively acquiring a second predetermined number of the standard sampling values and removing a maximum standard sampling value and a minimum standard sampling value from the acquired standard sampling values; and
calculating an average value of the remaining standard sampling values after removing the maximum standard sampling value and the minimum standard sampling value, as the standard temperature.

6. The method of claim 5 , after acquiring the standard sampling values, further comprising:
determining whether the standard sampling values are within a preset normal value interval;
if yes, sequentially storing the standard sampling values in a preset standard sampling value queue according to sampling time, wherein a length of the standard sampling value queue is equal to the second predetermined number; and
if not, setting the standard sampling values as invalid data and removing the same, and outputting a prompt signal indicating abnormality of standard measurement when all the successive second predetermined number of standard sampling values are invalid data.

Assignees

• Qingdao Haier Joint Stock Co Ltd

Inventors

• Li Chunyang
• Guo Sizhi
• Wang Ming

Classifications

• G01J5/10 Primary

  using electric radiation detectors · CPC title

• G01J5/80

  Calibration (using comparison with reference sources G01J5/52) · CPC title

• G01K1/20

  Compensating for effects of temperature changes other than those to be measured, e.g. changes in ambient temperature · CPC title

• F25D17/065

  with compartments at different temperatures · CPC title

• G05D23/1932 Primary

  to control the temperature of a plurality of spaces · CPC title