Low temperature starting method of variable frequency compressor

Abstract

The application discloses a low-temperature starting method of a variable frequency compressor. The method comprises the following steps: a main control MCU detects the environment temperature and sends the environment temperature to a variable frequency driving MCU; the variable frequency driving MCU judges the temperature parameter, and if the environment temperature is lower than 10 DEG C, a formula is used to calculate the starting operation parameter of the current variable frequency compressor, and if the environment temperature is higher than 10 DEG C, the fixed starting operation parameter is used; the variable frequency driving MCU executes the starting operation of the variable frequency refrigerator according to the starting operation parameter of the variable frequency compressor determined above. The environment temperature of the refrigerator is measured by setting an environment temperature sensor, the starting operation parameter of the variable frequency compressor is determined according to the environment temperature, the starting operation parameter of the same compressor is no longer fixed, the parameter is better matched with the environment temperature, the use environment temperature range of the refrigerator can be improved, and the probability of the starting failure of the compressor caused by the low environment temperature and the mismatching of the compressor parameter can be reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of refrigerator control, and particularly relates to a low-temperature starting method of a variable-frequency compressor. BACKGROUND

[0002] At present, the climate types of household refrigerators are divided into SN, N, ST and T four types, wherein the suitable use environment temperature of the sub-temperate type (SN) is 10 DEG C-32 DEG C, the suitable use environment temperature of the temperate type (N) is 16 DEG C-32 DEG C, the suitable use environment temperature of the sub-tropical type (ST) is 18 DEG C-38 DEG C, and the suitable use environment temperature of the tropical type (T) is 18 DEG C-43 DEG C, that is, the minimum applicable environment temperature of the refrigerator is generally 10 DEG C, but in winter, the environment temperature may be lower than 10 DEG C. Under normal circumstances, the suction side and the exhaust side of the compressor are at the same pressure when the refrigerator starts, that is, the starting is balanced pressure starting, and the balanced pressure values of the suction and the exhaust of the refrigerator are different at different environment temperatures, the balanced pressure is large when the temperature is high, and the balanced pressure is small when the temperature is low.

[0003] For the variable-frequency compressor, different starting operation parameters are different for each type of variable-frequency compressor, and generally, after the parameter matching of the variable-frequency compressor is completed, the parameter is written into the microprocessor program of the variable-frequency control board, so that the variable-frequency compressor can work normally. According to the applicable climate type of the refrigerator, the compressor is generally tested at normal temperature of about 25 DEG C when the compressor is matched, but when the environment temperature is lower than 10 DEG C, the balanced pressure is much smaller than that at normal temperature of 25 DEG C, which may result in that the compressor matched at normal environment temperature cannot start normally when the environment temperature is too low. SUMMARY

[0004] The application aims to provide a low-temperature starting method of a variable-frequency compressor, which measures the environment temperature of the refrigerator through a ring temperature sensor, calculates and determines the starting operation parameters of the variable-frequency compressor according to the environment temperature, and the starting operation parameters of the same compressor are no longer fixed, the parameters are better matched with the environment temperature, the use environment temperature range of the refrigerator can be improved, and the probability of the compressor starting failure caused by the low environment temperature and the mismatching of the compressor parameters can be greatly reduced.

[0005] To solve the above technical problems, the application is realized through the following technical scheme:

[0006] The application is a low-temperature starting method of a variable-frequency compressor, which comprises the following steps:

[0007] Stp1, power-on of the refrigerator;

[0008] Stp2, the main control MCU detects the environment temperature, and sends the environment temperature parameter from the main control MCU to the variable-frequency drive MCU;

[0009] Stp3, the variable frequency driving MCU judges the temperature parameter, if the ambient temperature is lower than 10 DEG C, the formula is used to calculate the current variable frequency compressor starting operation parameter, if the ambient temperature is higher than 10 DEG C, the fixed starting operation parameter is used;

[0010] Stp4, the variable frequency compressor starting operation parameter under the current ambient temperature is calculated according to the formula, including the following sub-steps:

[0011] S1: the refrigerator main control panel detects the ambient temperature, and sends the ambient temperature value Tamb to the compressor variable frequency driving board;

[0012] S2: the variable frequency driving board judges the ambient temperature Tamb, if less than 10 DEG C, step S3 is executed, if the ambient temperature Tamb is greater than 10 DEG C, step S6 is executed;

[0013] S3: the difference AT between the ambient temperature Tamb and 10 DEG C is calculated, the proportional coefficient δ of the temperature difference AT and the normal temperature 25 DEG C is calculated, the parameter adjustment coefficient φ is 1-0.5* δ;

[0014] S4: the starting operation parameters of the compressor under the normal temperature are read, the starting current Id, the starting stage position ring PID parameters Kp_pos and Ki_pos, the starting stage speed ring PID parameters Kp_spd and Ki_spd, the starting speed Fs and the starting acceleration A are read;

[0015] S5: the parameters in step S4 are multiplied by the parameter adjustment coefficient φ respectively, which is the starting operation parameter of the compressor under the ambient temperature;

[0016] S6, the running parameters of the compressor are confirmed according to the current ambient temperature, if the ambient temperature is greater than or equal to 10 DEG C, the starting operation parameters of the compressor matched under the normal temperature are executed, if the ambient temperature is less than 10 DEG C, the parameters calculated in S5 are executed;

[0017] Stp5, the variable frequency driving MCU executes the starting operation of the variable frequency refrigerator according to the variable frequency compressor starting operation parameters determined above.

[0018] Preferably, the main control MCU obtains the parameter ambient temperature Tamb by collecting the data of the ambient temperature detection module, and the ambient temperature detection module uses a temperature sensor.

[0019] Preferably, the main control MCU transmits the ambient temperature Tamb to the variable frequency driving MCU through the isolation module.

[0020] Preferably, the variable frequency driving MCU obtains the ambient temperature Tamb and judges the execution of the compressor running parameters, and the variable frequency driving MCU sends a driving signal to the inverter driving module to drive the variable frequency compressor to run.

[0021] The present application has the following advantages:

[0022] The present application measures the refrigerator ambient temperature by setting a ring temperature sensor, and determines the variable frequency compressor starting operation parameters according to the ambient temperature. The starting operation parameters of the same compressor are no longer fixed, and the parameters are better matched with the ambient temperature. The use environment temperature range of the refrigerator can be improved, and the probability of compressor starting failure caused by the low ambient temperature and the mismatched compressor parameters can be greatly reduced.

[0023] Of course, implementing any product of the present application does not necessarily require achieving all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed for the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 It is a flow chart of a low-temperature starting method for a variable frequency compressor.

[0026] Figure 2 It is a schematic diagram of starting operation parameter calculation steps of a low-temperature starting method and device for a variable frequency compressor.

[0027] Figure 3 It is a system block diagram of a low-temperature starting system for a variable frequency compressor. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] Please refer to Figure 1 The present application is a low-temperature starting method for a variable frequency compressor, which comprises the following steps:

[0030] Stp1, power on the refrigerator;

[0031] Stp2, the main control MCU detects the ambient temperature, and sends the ambient temperature parameters from the main control MCU to the variable frequency drive MCU;

[0032] Stp3, the variable frequency driving MCU judges the temperature parameter, if the environment temperature is lower than 10 DEG C, then the formula is used to calculate the current variable frequency compressor starting operation parameter, if the environment temperature is higher than 10 DEG C, then the fixed starting operation parameter is used;

[0033] Stp4, the variable frequency compressor starting operation parameter under the current environment temperature is calculated according to the formula;

[0034] Stp5, the variable frequency driving MCU executes the starting operation of the variable frequency refrigerator according to the variable frequency compressor starting operation parameter determined above.

[0035] As shown in Figure 2 , a starting operation parameter calculation method of a variable frequency compressor low-temperature starting method, comprising the following steps:

[0036] S1: the refrigerator main control board detects the environment temperature, and sends the environment temperature value Tamb to the compressor variable frequency driving board;

[0037] S2: the variable frequency driving board judges the ambient temperature Tamb, if less than 10 DEG C, then step S3 is executed, if the ambient temperature Tamb is greater than 10 DEG C, then step S6 is executed;

[0038] S3: the difference value AT of the ambient temperature Tamb and 10 DEG C is calculated, the proportional coefficient δ of the temperature difference AT and the normal temperature 25 DEG C is calculated, the parameter adjustment coefficient φ is equal to 1-0.5*δ;

[0039] S4: the starting operation parameters of the compressor under the normal temperature are read, the starting current Id, the starting stage position ring PID parameter Kp_pos, Ki_pos, the starting stage speed ring PID parameter Kp_spd, Ki_spd, the starting speed Fs, and the starting acceleration A are read;

[0040] S5: the parameters in step S4 are multiplied by the parameter adjustment coefficient φ respectively, which is the starting operation parameter of the compressor under the environment temperature;

[0041] S6, the running parameters of the compressor are confirmed according to the current environment temperature, if the environment temperature is greater than or equal to 10 DEG C, then the starting operation parameters of the compressor matched under the normal temperature are executed, if the environment temperature is less than 10 DEG C, then the parameters calculated in S5 are executed.

[0042] As shown in Figure 3 , a variable frequency compressor low-temperature starting system, the main control MCU obtains the parameter ambient temperature Tamb by collecting the data of the ambient temperature detection module, the above ambient temperature detection module uses a temperature sensor, the main control MCU transmits the ambient temperature Tamb to the variable frequency driving MCU through the isolation module, the variable frequency driving MCU obtains the ambient temperature Tamb and judges and executes the compressor running parameter, the variable frequency driving MCU sends the driving signal to the inverter driving module to drive the variable frequency compressor to run.

[0043] It is worth noting that the above system embodiments, including each unit is only divided according to the functional logic, but not limited to the above division, as long as the corresponding function can be realized; in addition, the specific name of each functional unit is only for the convenience of mutual distinction, and is not used to limit the protection scope of the present application.

[0044] In addition, those skilled in the art can understand that all or part of the steps of the above-mentioned embodiments can be completed by a program instructing related hardware, and the corresponding program can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk or optical disk, etc.

[0045] The preferred embodiments of the application disclosed above are only used to help explain the application. The preferred embodiments do not describe all the details and limit the application to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of the present application. The present application selects and describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and use the present application. The present application is limited by the claims and their entire scope and equivalents.

Claims

1. A low temperature start method for a variable frequency compressor, characterized by, Comprising the following steps: Stp1, the refrigerator is powered on; Stp2, the main control MCU detects the ambient temperature, and sends the ambient temperature parameter from the main control MCU to the variable frequency drive MCU; Stp3, the variable frequency drive MCU judges the temperature parameter, if the ambient temperature is lower than 10℃, then start formula calculation of current variable frequency compressor start running parameter, if the ambient temperature is higher than 10℃, then according to fixed start running parameter; Stp4, according to the formula calculation of the current ambient temperature of variable frequency compressor start running parameter; Comprising the following sub-steps: S1: the refrigerator main control board detects the ambient temperature, and sends the ambient temperature value Tamb to the compressor variable frequency drive board; S2: the variable frequency drive board judges the ambient temperature Tamb, if less than 10℃, then execute step S3, if the ambient temperature Tamb is greater than 10℃, then execute step S6; S3: calculate the difference of ambient temperature Tamb and 10℃, △T=10-Tamb, calculate the proportion coefficient of temperature difference △T and normal temperature 25℃, δ=△T / 25, parameter adjustment coefficient φ=1-0.5*δ; S4: read the start running parameter of the compressor at normal temperature, start current Id, start stage position ring PID parameter Kp_pos, Ki_pos, start stage speed ring PID parameter Kp_spd, Ki_spd, start speed Fs, start acceleration A; S5: multiply the parameters in step S4 by the parameter adjustment coefficient φ, which is the start running parameter of the compressor at the ambient temperature; S6, according to the current ambient temperature to confirm the running parameter of the compressor, if the ambient temperature is ≥10℃, then execute the start running parameter of the compressor matched at normal temperature; If the ambient temperature is <10℃, then execute the parameter calculated in S5; Stp5, the variable frequency drive MCU executes the start running of the variable frequency refrigerator according to the variable frequency compressor start running parameter determined in step Stp4.

2. The low temperature start method of a variable frequency compressor according to claim 1, wherein, The main control MCU obtains the parameter ambient temperature Tamb by collecting the data of the ambient temperature detection module, and the ambient temperature detection module uses a temperature sensor.

3. The low temperature start method of a variable frequency compressor according to claim 1, wherein, The main control MCU transmits the ambient temperature Tamb to the variable frequency drive MCU through the isolation module.

4. The low temperature start method of a variable frequency compressor according to claim 1, wherein, The variable frequency drive MCU obtains the ambient temperature Tamb and judges to execute the compressor running parameter, and the variable frequency drive MCU sends a drive signal to the inverter drive module to drive the variable frequency compressor to run.

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