A method for protecting refrigerator compressor

Abstract

The present invention discloses a refrigerator compressor protection method. The method records the compressor's downtime and downtime threshold on a non-volatile storage medium of a refrigerator control panel. When an abnormal power outage occurs, the defrost temperature at the time of the abnormal power outage is recorded on the non-volatile storage medium of the refrigerator control panel. When the refrigerator is powered on again, it is determined whether the compressor's downtime reaches the downtime threshold. If so, the compressor is directly started. Otherwise, a protection time is calculated based on the downtime threshold, the compressor's downtime, and the defrost temperature at the time of the abnormal power outage, combined with the collected current defrost temperature. If the protection time is greater than 0, the compressor is started after waiting for the protection time; otherwise, the compressor is directly started. The present invention accurately determines the compressor startup time, improves operational reliability, and does not increase costs.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliance control, in particular to a method for protecting a refrigerator compressor. Background Art

[0002] As a core component of refrigerators, the safe and reliable operation of the compressor directly impacts the lifespan of the entire unit. Therefore, to ensure stable and safe compressor operation, existing refrigerators often monitor and protect the compressor's operating status. Typically, when the refrigerator needs to start the compressor, it needs to know the last downtime. Only when the downtime exceeds a certain threshold can the compressor be restarted. Otherwise, the compressor's starting current may increase significantly or even fail to start due to a large differential pressure between the compressor's intake and exhaust, thus shortening the compressor's service life. To address this issue, refrigerators need to record the last compressor downtime. However, if power is suddenly lost while the compressor is operating or the downtime has not reached the threshold, the program loses this time, making it impossible to determine the compressor downtime upon the next power-on. If the compressor is forced to wait for the threshold time before starting upon power-on, it will not start quickly enough during production inspections, reducing production efficiency. Conventional technology incorporates a delay circuit on the control board, allowing the program to determine whether the compressor downtime has exceeded the threshold each time the system is powered on. However, this increases costs. Summary of the Invention

[0003] The object of the present invention is to provide a refrigerator compressor protection method for solving the problem in the prior art that the compressor downtime cannot be determined after the refrigerator is powered off, resulting in the inability to start the compressor in a short time, and the problem in the prior art that a delay circuit is added to the mainboard, resulting in increased costs.

[0004] The present invention solves the above problems through the following technical solutions:

[0005] A method for protecting a refrigerator compressor, comprising:

[0006] Step S100: Recording the downtime of the compressor and the downtime threshold in a non-volatile storage medium of the refrigerator control panel; and recording the defrost temperature at the time of abnormal power failure in the non-volatile storage medium of the refrigerator control panel when an abnormal power failure occurs.

[0007] Step S200: When the refrigerator is powered on again, determine whether the downtime of the compressor reaches the downtime threshold. If so, the compressor is started directly. Otherwise, the protection time is calculated based on the downtime threshold, the downtime of the compressor and the defrost temperature at the time of abnormal power failure, combined with the collected current defrost temperature. If the protection time is greater than 0, start the compressor after waiting for the protection time; otherwise, start the compressor directly.

[0008] The method for calculating the protection time is as follows: a curve showing the change in defrost temperature with downtime after the compressor is shut down is prepared in advance and recorded on a non-volatile storage medium of the refrigerator control panel; when the refrigerator is powered on, the power off time is obtained based on the defrost temperature at the time of abnormal power off and the current defrost temperature collected when the power is turned on, combined with the curve, to calculate the protection time: protection time = compressor downtime threshold - power off time - compressor downtime.

[0009] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0010] The present invention calculates the protection time required for the compressor by using the recorded downtime threshold, the compressor's downtime, the recorded defrost temperature, and the currently collected defrost temperature. This can accurately grasp the compressor startup time and improve operational reliability without increasing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a power-on flow chart of the present invention;

[0012] Figure 2 It is a power-off flow chart of the present invention. DETAILED DESCRIPTION

[0013] The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto.

[0014] Example:

[0015] Combined with attachment Figure 1 As shown, a method for protecting a refrigerator compressor includes:

[0016] First, during the power-on sequence, the compressor downtime parameter α (which may be the downtime) stored in the non-volatile storage medium is read. If the compressor downtime = the set value (for example, 255, the compressor downtime reaches the downtime threshold (for example, 300 seconds), the downtime parameter is assigned 255), and the set value can be any value between 0 and the downtime threshold, the compressor is directly started, the normal process is entered, and the compressor start and stop control is performed.

[0017] If the compressor downtime parameter α is less than the set value (255), the compressor downtime protection time is calculated based on the recorded compressor downtime, the recorded defrost temperature β, and the currently collected defrost temperature γ. Before this time is reached, the compressor cannot be turned on.

[0018] It should be noted that the formula used to calculate the compressor protection time based on the difference between the compressor downtime and defrost temperature at power-on and the recorded time requires specific machine model and experimental determination. The specific implementation method is as follows: Under experimental conditions, when the compressor is down, a curve of the defrost temperature over time is recorded. This curve depends on the specific machine model and varies from model to model. This curve is then recorded on the refrigerator control panel for that model, and this data is stored as a control parameter in the control panel's non-volatile storage medium. Subsequently, when the refrigerator is in normal use, at the moment of power-on, the compressor downtime is estimated based on the compressor downtime, the recorded defrost temperature, and the defrost temperature at power-on. For example, under experimental conditions, if the compressor is running and the defrost temperature is -2°C when the refrigerator is powered off, and it is measured that the defrost temperature reaches 5°C three minutes later, then upon the next power-on, if the compressor downtime is 0, the defrost temperature at the time of the abnormal power-off is -2°C, and the observed defrost temperature at power-on is 5°C, then the compressor has been powered off for approximately three minutes. Therefore, if the compressor protection time threshold is 5 minutes, you need to wait another 2 minutes before starting the compressor.

[0019] like Figure 2 As shown, at the moment of power failure, if the compressor is in the running stage, the recorded downtime parameter α is 0; then at the next startup, the protection time is calculated according to the defrost temperature at the time of abnormal power failure and the defrost temperature at power-on and the curve according to the above method; if the compressor has stopped and the downtime has still reached the threshold, the recorded downtime parameter α is 255, and the compressor is started directly at the next power-on startup; if the compressor has stopped and the downtime has not reached the threshold, for example, when the refrigerator is powered off, the compressor has stopped running for 1 minute, that is, the compressor has stopped time for 1 minute, and the defrost temperature at power off is -2°C. Assuming that it is measured that the defrost temperature becomes 5°C after 3 minutes, then when the power is turned on next time, the defrost temperature at power-on is observed to be 5°C, which means that the power outage time is about 3 minutes and the compressor stop time is 4 minutes, then it is necessary to wait for another 1 minute before starting the compressor.

[0020] Although the present invention is described herein with reference to illustrative embodiments of the present invention, the above embodiments are merely preferred embodiments of the present invention, and the embodiments of the present invention are not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A method for protecting a refrigerator compressor, characterized in that: include: Step S100: recording the downtime of the compressor and the downtime threshold in a non-volatile storage medium of the refrigerator control panel; When an abnormal power outage occurs, the defrost temperature at the time of the abnormal power outage is recorded in the non-volatile storage medium of the refrigerator control panel; Step S200: When the refrigerator is powered on again, it is determined whether the downtime of the compressor reaches the downtime threshold. If so, the compressor is started directly. Otherwise, a protection time is calculated based on the downtime threshold, the downtime of the compressor, and the defrost temperature at the time of the abnormal power outage, combined with the collected current defrost temperature. If the protection time is greater than 0, the compressor is started after waiting for the protection time. Otherwise, start the compressor directly.

2. A refrigerator compressor protection method according to claim 1, characterized in that: The method for calculating the protection time is as follows: a curve showing the change in defrost temperature with downtime after the compressor is shut down is prepared in advance and recorded on a non-volatile storage medium of the refrigerator control panel; when the refrigerator is powered on, the power off time is obtained based on the defrost temperature at the time of abnormal power off and the current defrost temperature collected when the power is turned on, combined with the curve, to calculate the protection time: protection time = compressor downtime threshold - power off time - compressor downtime.

Images