Method for adjusting frequency of compressor and air conditioner

Abstract

This invention provides a method for adjusting compressor frequency and an air conditioner. The method for adjusting compressor frequency includes the following steps: S1. Under moderate operating conditions, several frequency levels are set for the compressor. The target compressor frequency for each level is obtained through a limited number of compressor frequency adjustments, thus obtaining a constant frequency mode frequency table for moderate operating conditions; S2. Under other operating conditions (adverse or suitable conditions), the target frequency corresponding to one level in the constant frequency mode frequency table for moderate operating conditions is selected as the default frequency for the compressor under other operating conditions. By adjusting the level, the compressor frequency is increased or decreased, thereby obtaining a suitable frequency for other operating conditions. The compressor frequency adjustment method of this invention divides frequency control into several levels. When adjusting the compressor, only the level needs to be adjusted, which improves the ease of operation, reduces operational risks, and facilitates the rapid adjustment of a specific frequency.

Description

Technical Field

[0001] This invention relates to the field of air conditioning, and more specifically, to a method for adjusting the compressor frequency and an air conditioner. Background Technology

[0002] In constant frequency mode, the air conditioner operates at a fixed frequency. Existing inverter air conditioners, in scenarios requiring frequent compressor frequency adjustments—such as during testing or when developers change the compressor's operating state by adjusting the frequency—control the compressor frequency through numerical adjustments, typically from 0Hz to 120Hz, requiring testing each step individually. This process is complex and carries the risk of operational errors and potential operational risks.

[0003] In view of this, the present invention is hereby proposed. Summary of the Invention

[0004] The purpose of this invention is to propose a method for adjusting the compressor frequency and an air conditioner, in order to solve the problem that in the prior art, the compressor frequency of variable frequency air conditioners is controlled by numerical adjustment. In scenarios where frequent frequency adjustment is required, such as when testers or developers change the compressor's working state by adjusting the frequency, the operation is complicated and there may be operational risks caused by erroneous values.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A method for adjusting the frequency of a compressor, the method comprising the following steps:

[0007] S1. Under moderate operating conditions, set several levels for the compressor frequency, and obtain the target compressor frequency corresponding to each level under moderate operating conditions through a limited number of compressor frequency adjustments, thus obtaining the constant frequency mode frequency table under moderate operating conditions.

[0008] S2. Under other operating conditions (harsh or suitable conditions), select one of the target frequencies corresponding to the constant frequency mode in the moderate operating condition frequency table as the default frequency for the compressor under other operating conditions. By adjusting the gear, the compressor frequency can be increased or decreased to obtain the suitable frequency for other operating conditions.

[0009] The compressor frequency adjustment method described in this invention divides the frequency control into several levels. When adjusting the compressor, only the level needs to be adjusted, which can improve the ease of operation, reduce the operational risk, and help to quickly achieve the adjustment of a specific frequency.

[0010] Furthermore, step S1 includes the following steps:

[0011] S11. Under moderate operating conditions, the compressor frequency is set to several levels, including at least a high level, a low level, and other levels; first, the compressor is run at the default frequency under the high level, and the target frequency under the high level is obtained through a limited number of compressor frequency adjustments; then, the compressor is run at the default frequency under the low level, and the target frequency under the low level is obtained through a limited number of compressor frequency adjustments; or, the compressor is first run at the default frequency under the low level, and the target frequency under the low level is obtained through a limited number of compressor frequency adjustments; then, the compressor is run at the default frequency under the high level, and the target frequency under the high level is obtained through a limited number of compressor frequency adjustments.

[0012] S12. Determine the target frequency for other gears.

[0013] This setting facilitates obtaining the compressor target frequency corresponding to each gear under suitable operating conditions, thus enabling the generation of a constant frequency mode frequency table under suitable operating conditions.

[0014] Furthermore, in step S11, obtaining the target frequency at the high gear through a limited number of compressor frequency adjustments includes the following steps:

[0015] Obtain the initial frequency F0 to start the compressor; obtain the outdoor ambient temperature Ta; obtain the actual value Iq of the compressor's q-axis current. 实际 ; Calculate the target value Iq of the compressor q-axis current. 目标 By judging Iq 目标 andIq 实际 Adjust the frequency difference and repeat the above process until the adjustment end condition is met to obtain the target frequency of the high gear.

[0016] This setting facilitates obtaining the target frequency at a higher gear.

[0017] Furthermore, in step S11, obtaining the target frequency at the low gear through a finite number of compressor frequency adjustments includes the following steps:

[0018] Obtain the initial frequency F0 to start the compressor; obtain the outdoor ambient temperature Ta; obtain the actual value Iq of the compressor's q-axis current. 实际 ; Calculate the target value Iq of the compressor q-axis current. 目标 By judging Iq 目标 andIq 实际 Adjust the frequency difference and repeat the above process until the adjustment end condition is met to obtain the target frequency of the low gear.

[0019] This setting makes it easier to obtain the target frequency at the lower gear.

[0020] Furthermore, in step S12, the target frequency for other gears is determined by the difference method.

[0021] This setting facilitates obtaining target frequencies for other settings and ensures that the obtained frequencies are compatible with most air conditioner models.

[0022] Furthermore, step S2 includes the following steps:

[0023] S21. Under other operating conditions (harsh or suitable conditions), the compressor is operated with one of the frequency settings in the constant frequency mode under moderate operating conditions as the initial setting, and the target frequency corresponding to the initial setting is the default frequency under other operating conditions.

[0024] S22. Real-time acquisition of the compressor's exhaust temperature;

[0025] S23. Determine whether the exhaust temperature is ≥ the exhaust temperature threshold; if yes, proceed to step S24; otherwise, proceed to step S25.

[0026] S24. Lowering the speed by one gear reduces the compressor frequency. If the exhaust temperature after lowering the speed by one gear is less than the exhaust temperature threshold, then the target frequency corresponding to the current speed is the appropriate frequency under other operating conditions.

[0027] S25. Increase the compressor frequency by one gear. If the exhaust temperature after increasing the gear by one gear is greater than or equal to the exhaust temperature threshold, then the target frequency corresponding to the initial gear is the appropriate frequency under other operating conditions.

[0028] Steps S21 to S25 are interconnected and work together. The detection and judgment of exhaust temperature in steps S22 and S23 help determine whether the compressor's high-temperature protection has been triggered. If the exhaust temperature is greater than or equal to the exhaust temperature threshold, it indicates that the compressor's high-temperature protection will be triggered. Then, proceed to step S24 to lower the compressor's frequency by one gear. If the exhaust temperature after lowering the frequency by one gear is less than the exhaust temperature threshold, the target frequency corresponding to the current gear is a suitable frequency for other operating conditions. If the exhaust temperature is less than the exhaust temperature threshold, it indicates that the compressor's high-temperature protection will not be triggered. Then, proceed to step S25 to raise the compressor's frequency by one gear. If the exhaust temperature after raising the frequency by one gear is greater than or equal to the exhaust temperature threshold, the target frequency corresponding to the initial gear is a suitable frequency for other operating conditions.

[0029] Furthermore, Iq 目标 =A×F0+B; Based on the outdoor ambient temperature Ta, look up the corresponding A and B values ​​in the table.

[0030] This setting facilitates obtaining Iq. 目标 .

[0031] Furthermore, by judging Iq 目标 andIq 实际 The frequency adjustment for the difference specifically includes the following steps:

[0032] If |Iq 目标 -Iq 实际 If |≤ the first preset current threshold [ΔI1], then the frequency will not be adjusted;

[0033] If the first preset current threshold [ΔI1] < Iq 目标 -Iq 实际 If the current is less than or equal to the second preset current threshold [ΔI2], then the frequency increases by the preset frequency adjustment reference value [ΔF].

[0034] If the second preset current threshold [ΔI2] < Iq 目标 -Iq 实际 If the current is less than or equal to the third preset current threshold [ΔI3], the frequency will increase by 2 * the preset frequency adjustment reference value [ΔF].

[0035] If the third preset current threshold [ΔI3] < Iq 目标 -Iq 实际 The frequency will increase by 4 * the preset frequency adjustment reference value [ΔF].

[0036] If the first preset current threshold [ΔI1] < Iq 目标 -Iq 实际 If the current is less than or equal to the second preset current threshold [ΔI2], then the frequency is reduced by the preset frequency adjustment reference value [ΔF].

[0037] If the second preset current threshold [ΔI2] < Iq 目标 -Iq 实际 If the current is less than or equal to the third preset current threshold [ΔI3], the frequency will decrease by 2 * the preset frequency adjustment reference value [ΔF].

[0038] If the third preset current threshold [ΔI3] < Iq 目标 -Iq 实际 If the frequency decreases by 4 * the preset frequency adjustment reference value [ΔF], then the frequency will decrease.

[0039] This setting makes it easy to adjust according to Iq. 目标 andIq 实际 The difference adjustment frequency.

[0040] Furthermore, the adjustment termination condition is: satisfying |Iq| three consecutive times. 目标 -Iq 实际 |≤First preset current threshold [ΔI1]; or, if the adjusted frequency > [F] is satisfied for 3 consecutive times. 当前档位最大频率 ]; or, if the adjusted frequency is less than [F] for three consecutive times. 当前档位最小频率 】; or, the cumulative number of adjustments reaches 15 times.

[0041] This setting facilitates the end of frequency adjustment.

[0042] In a second aspect, the present invention provides an air conditioner comprising an indoor unit and an outdoor unit, wherein the compressor of the outdoor unit uses a compressor frequency adjustment method as described in any one of the present invention.

[0043] The present invention proposes a method for adjusting the compressor frequency and an air conditioner. Compared with the prior art, the method for adjusting the compressor frequency and the air conditioner of the present invention have the following advantages:

[0044] 1) The compressor frequency adjustment method and air conditioner described in this invention allow developers to select different speed settings without frequently adjusting the specific frequency value of each speed setting, thus simplifying the operation process.

[0045] 2) The compressor frequency adjustment method and air conditioner described in this invention allow developers to simply select the gear, reducing the possibility of manually inputting the frequency and thus lowering the operational risk caused by input errors.

[0046] 3) The compressor frequency adjustment method and air conditioner described in this invention may need to quickly switch to a specific frequency under different working conditions. The target frequency can be quickly adjusted by using a preset gear.

[0047] 4) The compressor frequency adjustment method and air conditioner described in this invention can ensure consistent operating frequency on different devices by using the same gear, thereby standardizing the operation process.

[0048] 5) The compressor frequency adjustment method and air conditioner described in this invention can improve the stability and reliability of the system by setting a fixed target frequency, thereby preventing operators from accidentally adjusting the frequency to an inappropriate range. Attached Figure Description

[0049] Figure 1 This is a flowchart illustrating a method for adjusting the frequency of a compressor according to an embodiment of the present invention. Detailed Implementation

[0050] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. The descriptions of "first," "second," etc., mentioned in the embodiments of the present invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0051] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0052] This invention proposes a method for adjusting the frequency of a compressor, such as... Figure 1 As shown, the method for adjusting the compressor frequency includes the following steps:

[0053] S1. Under moderate operating conditions, set several levels for the compressor frequency, and obtain the target compressor frequency corresponding to each level under moderate operating conditions through a limited number of compressor frequency adjustments, thus obtaining the constant frequency mode frequency table under moderate operating conditions.

[0054] S2. Under other operating conditions (harsh or suitable conditions), select one of the target frequencies corresponding to the constant frequency mode in the moderate operating condition frequency table as the default frequency for the compressor under other operating conditions. By adjusting the gear, the compressor frequency can be increased or decreased to obtain the suitable frequency for other operating conditions.

[0055] The compressor frequency adjustment method described in this invention divides the frequency control into several levels. When adjusting the compressor, only the level needs to be adjusted, which can improve the ease of operation, reduce the operational risk, and help to quickly achieve the adjustment of a specific frequency.

[0056] Specifically, in this invention, the working conditions are divided into three types: severe working conditions, moderate working conditions, and suitable working conditions.

[0057] More specifically, severe operating conditions refer to heating in winter and cooling in summer; moderate operating conditions refer to heating and cooling in autumn and spring; and suitable operating conditions refer to cooling in winter and heating in summer.

[0058] Specifically, the appropriate frequency refers to the maximum operating frequency that will not trigger the compressor's high-temperature protection.

[0059] Specifically, there is no limit to the number of settings for the compressor frequency.

[0060] More specifically, the compressor frequency can be set to three levels, five levels, or even seven levels, and is not limited to these.

[0061] Specifically, step S1 includes the following steps:

[0062] S11. Under moderate operating conditions, the compressor frequency is set to several levels, including at least a high level, a low level, and other levels; first, the compressor is run at the default frequency under the high level to obtain the target frequency under the high level, and then the compressor is run at the default frequency under the low level to obtain the target frequency under the low level; or, the compressor is run at the default frequency under the low level to obtain the target frequency under the low level, and then the compressor is run at the default frequency under the high level to obtain the target frequency under the high level.

[0063] S12. Determine the target frequency for other gears.

[0064] This setting facilitates obtaining the compressor target frequency corresponding to each gear under suitable operating conditions, thus enabling the generation of a constant frequency mode frequency table under suitable operating conditions.

[0065] Specifically, the aforementioned gears include at least high gears, low gears, and other gears.

[0066] Specifically, the other gears are not limited to any particular gear.

[0067] The other gears can be medium gears, high-power gears, silent gears, and high-power gears, and are not limited to these.

[0068] More specifically, in step S11, obtaining the target frequency at the high gear through a limited number of compressor frequency adjustments includes the following steps:

[0069] Obtain the initial frequency F0 to start the compressor; obtain the outdoor ambient temperature Ta and the actual value of the compressor q-axis current Iq. 实际 ; Calculate the target value Iq of the compressor q-axis current. 目标 By judging Iq 目标 andIq 实际 Increase or decrease the frequency by the difference, and repeat the above process until the adjustment end condition is met to obtain the target frequency of the high-level setting.

[0070] This setting facilitates obtaining the target frequency at a higher gear.

[0071] More specifically, in step S11, obtaining the target frequency at the low gear through a limited number of compressor frequency adjustments includes the following steps:

[0072] Obtain the initial frequency F0 to start the compressor; obtain the outdoor ambient temperature Ta and the actual value of the compressor q-axis current Iq. 实际 ; Calculate the target value Iq of the compressor q-axis current. 目标 By judging Iq 目标 andIq 实际 Increase or decrease the frequency by the difference, and repeat the above process until the adjustment end condition is met to obtain the target frequency of the low gear.

[0073] This setting makes it easier to obtain the target frequency at the lower gear.

[0074] More specifically, in step S12, the target frequency for other gears is determined by the difference method.

[0075] This setting facilitates obtaining target frequencies for other settings and ensures that the obtained frequencies are compatible with most air conditioner models.

[0076] Specifically, obtaining the initial frequency F0 to run the compressor includes the following steps:

[0077] If it is the first constant frequency calculation after power-on: F0 = [F 当前档位默认 】,

【F 当前档位默认 This is the default frequency for the current gear. The specific value will be determined by testers in the laboratory.

[0078] If it is not the first time the frequency is constant after power-on, the frequency meter calculation is: F0 = F 上当前档位频率 F 上当前档位频率 The current gear frequency is calculated from the previous constant frequency table.

[0079] Specifically, obtain the actual value Iq of the compressor's q-axis current. 实际 Includes the following steps:

[0080] In each frequency calculation for the current gear, if the motor runs at the initial frequency F0 for 30 seconds before the first frequency adjustment, the average q-axis current recorded during the last 5 seconds of that running time is denoted as Iq. 实际 .

[0081] If, before the second and subsequent frequency adjustments, the motor runs at the frequency after the last adjustment for 6 or 10 seconds, the average q-axis current recorded during the last 5 seconds of operation is denoted as Iq actual; where, if |Iq| was the value before the last frequency adjustment... 目标 -Iq 实际 If |≤ the first preset current threshold [ΔI1], then run for 6 seconds; if |Iq before the last frequency adjustment 目标 -Iq 实际 If the first preset current threshold [ΔI1] is reached, the process will run for 10 seconds.

[0082] Specifically, the outdoor ambient temperature Ta is obtained through an outdoor ambient temperature sensor.

[0083] Specifically, Iq 目标 =A×F0+B; Based on the outdoor ambient temperature Ta, look up the corresponding A and B values ​​in the table.

[0084] Specifically, the A and B values ​​differ between high and low gear settings. Even at the same gear setting, the A and B values ​​differ under different outdoor ambient temperatures. The specific values ​​are determined by testers in the laboratory.

[0085] Specifically, by judging Iq 目标 andIq 实际 The frequency adjustment for the difference specifically includes the following steps:

[0086] If |Iq 目标 -Iq 实际 If |≤ the first preset current threshold [ΔI1], then the frequency will not be adjusted;

[0087] If the first preset current threshold [ΔI1] < Iq 目标 -Iq 实际 If the current is less than or equal to the second preset current threshold [ΔI2], then the frequency increases by the preset frequency adjustment reference value [ΔF].

[0088] If the second preset current threshold [ΔI2] < Iq 目标 -Iq 实际 If the current is less than or equal to the third preset current threshold [ΔI3], the frequency will increase by 2 * the preset frequency adjustment reference value [ΔF].

[0089] If the third preset current threshold [ΔI3] < Iq 目标 -Iq 实际 The frequency will increase by 4 * the preset frequency adjustment reference value [ΔF].

[0090] If the first preset current threshold [ΔI1] < Iq 目标 -Iq 实际 If the current is less than or equal to the second preset current threshold [ΔI2], then the frequency is reduced by the preset frequency adjustment reference value [ΔF].

[0091] If the second preset current threshold [ΔI2] < Iq 目标 -Iq 实际 If the current is less than or equal to the third preset current threshold [ΔI3], the frequency will decrease by 2 * the preset frequency adjustment reference value [ΔF].

[0092] If the third preset current threshold [ΔI3] < Iq 目标 -Iq 实际 If the frequency decreases by 4 * the preset frequency adjustment reference value [ΔF], then the frequency will decrease.

[0093] Specifically, by judging Iq 目标 andIq 实际 The difference adjustment frequency also includes the following steps:

[0094] After frequency adjustment,

[0095] If the adjusted frequency is > [F] 当前档位最大频率 If the frequency is adjusted, then the frequency = [F]. 当前档位最大频率 】;

[0096] If the adjusted frequency is < [F] 当前档位最小频率 If the frequency is adjusted, then the frequency = [F]. 当前档位最小频率 】

[0097] Specifically, the adjustment termination condition is: satisfying |Iq| for three consecutive times. 目标 -Iq 实际 |≤First preset current threshold [ΔI1]; or, if the adjusted frequency > [F] is satisfied for 3 consecutive times. 当前档位最大频率 ]; or, if the adjusted frequency is less than [F] for three consecutive times. 当前档位最小频率 】; or, the cumulative number of adjustments reaches 15 times.

[0098] Specifically, 0 < first preset current threshold [ΔI1] < second preset current threshold [ΔI2] < third preset current threshold [ΔI3].

[0099] Specifically, during the constant frequency table calculation in step S1, if a compressor shutdown command is received or a protection shutdown occurs, the compressor will stop. After the compressor restarts, the constant frequency table calculation in step S1 will be executed again.

[0100] Specifically, step S2 includes the following steps:

[0101] S21. Under other operating conditions (harsh or suitable conditions), the compressor is operated with one of the frequency settings in the constant frequency mode under moderate operating conditions as the initial setting, and the target frequency corresponding to the initial setting is the default frequency under other operating conditions.

[0102] S22. Real-time acquisition of the compressor's exhaust temperature;

[0103] Specifically, in step S22, the exhaust temperature is obtained through an exhaust temperature sensor.

[0104] S23. Determine whether the exhaust temperature is ≥ the exhaust temperature threshold; if yes, proceed to step S24; otherwise, proceed to step S25.

[0105] S24. Lowering the speed by one gear reduces the compressor frequency. If the exhaust temperature after lowering the speed by one gear is less than the exhaust temperature threshold, then the target frequency corresponding to the current speed is the appropriate frequency under other operating conditions.

[0106] S25. Increase the compressor frequency by one gear. If the exhaust temperature after increasing the gear by one gear is greater than or equal to the exhaust temperature threshold, then the target frequency corresponding to the initial gear is the appropriate frequency under other operating conditions.

[0107] Steps S21 to S25 are interconnected and work together. The detection and judgment of exhaust temperature in steps S22 and S23 help determine whether the compressor's high-temperature protection has been triggered. If the exhaust temperature is greater than or equal to the exhaust temperature threshold, it indicates that the compressor's high-temperature protection will be triggered. Then, proceed to step S24 to lower the compressor's frequency by one gear. If the exhaust temperature after lowering the frequency by one gear is less than the exhaust temperature threshold, the target frequency corresponding to the current gear is a suitable frequency for other operating conditions. If the exhaust temperature is less than the exhaust temperature threshold, it indicates that the compressor's high-temperature protection will not be triggered. Then, proceed to step S25 to raise the compressor's frequency by one gear. If the exhaust temperature after raising the frequency by one gear is greater than or equal to the exhaust temperature threshold, the target frequency corresponding to the initial gear is a suitable frequency for other operating conditions.

[0108] Specifically, step S24 includes the following steps:

[0109] S241, Lower the gear by one level;

[0110] S242, Obtain the exhaust temperature again;

[0111] S243. Determine whether the exhaust temperature is greater than the exhaust temperature threshold; if yes, proceed to step S244; if no, proceed to step S245.

[0112] S244. Lower the setting by one level until you obtain a suitable frequency for other operating conditions;

[0113] S245. The target frequency corresponding to the current gear is the appropriate frequency for other operating conditions.

[0114] Specifically, step S25 includes the following steps:

[0115] S251, Increase the gear by one level;

[0116] S252, Obtain the exhaust temperature again;

[0117] S253. Determine whether the exhaust temperature is ≥ the exhaust temperature threshold; if yes, proceed to step S254; if no, proceed to step S255.

[0118] S254. The target frequency corresponding to the initial gear position is the appropriate frequency under other operating conditions.

[0119] S255, then increase the setting by one level until a suitable frequency for other operating conditions is obtained.

[0120] Example 1

[0121] This embodiment proposes a method for adjusting the compressor frequency, which includes the following steps:

[0122] S1. Under moderate operating conditions, the compressor frequency is set to five levels: high power, high speed, medium speed, low speed and silent speed. The compressor target frequency corresponding to the five levels under moderate operating conditions is obtained by adjusting the compressor frequency a limited number of times, which is the constant frequency mode frequency table under moderate operating conditions.

[0123] S2. Under other operating conditions (harsh or suitable conditions), select one of the target frequencies corresponding to the constant frequency mode in the moderate operating condition frequency table as the default frequency for the compressor under other operating conditions, and adjust the frequency to achieve the compressor's operation.

[0124] The compressor frequency adjustment method described in this embodiment divides the frequency control into several levels. When adjusting the compressor, only the level needs to be adjusted, which can improve the ease of operation, reduce the operational risk, and help to quickly achieve the adjustment of a specific frequency.

[0125] Specifically, the frequency table for the constant frequency mode is shown in Table 1.

[0126] Table 1 Frequency Table for Constant Frequency Mode

[0127]

[0128] Specifically, step S1 includes the following steps:

[0129] S11. Under moderate operating conditions, the compressor frequency is set to five levels. First, use the default frequency F at the highest level. 高档默认 Running the compressor, the target frequency F at the high setting is obtained. 高档 Then, at the default frequency F in the low gear setting. 低档默认 Run the compressor to obtain the target frequency F at the low gear setting. 低档 ;

[0130] S12. Determine the target frequency F of the high-power setting. 强力档 Mid-range target frequency F 中档 The target frequency F of the mute mode 静音档 .

[0131] More specifically, in step S11, obtaining the target frequency at the high gear through a limited number of compressor frequency adjustments includes the following steps:

[0132] Obtain the initial frequency F0 to start the compressor; obtain the outdoor ambient temperature Ta and the actual value of the compressor q-axis current Iq. 实际 ; Calculate the target value Iq of the compressor q-axis current.目标 By judging Iq 目标 andIq 实际 The difference is increased or decreased in frequency, and the above process is repeated until the adjustment end condition is met, thus obtaining the target frequency F of the higher gear. 高档 .

[0133] More specifically, in step S11, obtaining the target frequency at the low gear through a limited number of compressor frequency adjustments includes the following steps:

[0134] Obtain the initial frequency F0 to start the compressor; obtain the outdoor ambient temperature Ta and the actual value of the compressor q-axis current Iq. 实际 ; Calculate the target value Iq of the compressor q-axis current. 目标 By judging Iq 目标 andIq 实际 The difference is increased or decreased in frequency, and the above process is repeated until the adjustment end condition is met, thus obtaining the target frequency F of the low gear. 低档 .

[0135] More specifically, in step S12, the target frequency F of the high-power setting is determined by the difference method. 强力档 Mid-range target frequency F 中档 The target frequency F of the mute mode 静音档 The target frequency.

[0136] More specifically, in step S12, the target frequency F of the high-power setting... 强力档 =F 高档 +(F 高档 -F 低档 ) / 2; Target frequency F for mid-range gear 中档 =(F 高档 +F 低档 ) / 2; Target frequency F of the mute mode 静音档 =F 低档 -(F 高档 -F 低档 ) / 2.

[0137] Specifically, obtaining the initial frequency F0 to run the compressor includes the following steps:

[0138] If it is the first constant frequency calculation after power-on: F0 = [F 当前档位默认 】,

【F 当前档位默认 This is the default frequency for the current gear. The specific value will be determined by testers in the laboratory.

[0139] If it is not the first time the frequency is constant after power-on, the frequency meter calculation is: F0 = F 上当前档位频率 F 上当前档位频率 The current gear frequency is calculated from the previous constant frequency table.

[0140] Specifically, obtain the actual value Iq of the compressor's q-axis current. 实际 Includes the following steps:

[0141] In each frequency calculation for the current gear, if the motor runs at the initial frequency F0 for 30 seconds before the first frequency adjustment, the average q-axis current recorded during the last 5 seconds of that running time is denoted as Iq. 实际 .

[0142] If, before the second and subsequent frequency adjustments, the motor runs at the frequency after the last adjustment for 6 or 10 seconds, the average q-axis current recorded during the last 5 seconds of operation is denoted as Iq actual; where, if |Iq| was the value before the last frequency adjustment... 目标 -Iq 实际 If |≤ the first preset current threshold [ΔI1], then run for 6 seconds; if |Iq before the last frequency adjustment 目标 -Iq 实际 If the first preset current threshold [ΔI1] is reached, the process will run for 10 seconds.

[0143] Specifically, the outdoor ambient temperature Ta is obtained through an outdoor ambient temperature sensor.

[0144] Specifically, Iq 目标 =A×F0+B; Based on the outdoor ambient temperature Ta, refer to the tables (Table 2 and Table 3) to obtain the corresponding A and B values ​​for the gear.

[0145] Specifically, the A and B values ​​differ between high and low gear settings. Even at the same gear setting, the A and B values ​​differ under different outdoor ambient temperatures. The specific values ​​are determined by testers in the laboratory.

[0146] Specifically, Table 2 shows the A and B values ​​corresponding to different outdoor ambient temperatures Ta under the high setting; Table 3 shows the A and B values ​​corresponding to different outdoor ambient temperatures Ta under the low setting.

[0147] Table 2. A and B values ​​corresponding to different outdoor ambient temperatures at the high setting.

[0148] Outdoor ambient temperature Ta (°C) Corresponding A value (EE table) Corresponding B value (EE table) Ta≤10

High_A1

High_B1

High_A2

High_B2

High_A3

High_B3

High_A4

High_B4

High_A5

High_B5

High_A6

High_B6

[0149] Table 3. Values ​​A and B corresponding to different outdoor ambient temperatures at the low setting.

[0150] Outdoor ambient temperature Ta (°C) Corresponding A value (EE form) Corresponding B value (EE table) Ta≤10

Low_A1

Low_B1

Low_A2

Low_B2

Low_A3

Low_B3

Low_A4

Low_B4

Low_A5

Low_B5

Low_A6

Low_B6

[0151] Specifically, by judging Iq 目标 andIq 实际 The frequency adjustment for the difference specifically includes the following steps:

[0152] If |Iq 目标 -Iq实际 If |≤ the first preset current threshold [ΔI1], then the frequency will not be adjusted;

[0153] If the first preset current threshold [ΔI1] < Iq 目标 -Iq 实际 If the current is less than or equal to the second preset current threshold [ΔI2], then the frequency increases by the preset frequency adjustment reference value [ΔF].

[0154] If the second preset current threshold [ΔI2] < Iq 目标 -Iq 实际 If the current is less than or equal to the third preset current threshold [ΔI3], the frequency will increase by 2 * the preset frequency adjustment reference value [ΔF].

[0155] If the third preset current threshold [ΔI3] < Iq 目标 -Iq 实际 The frequency will increase by 4 * the preset frequency adjustment reference value [ΔF].

[0156] If the first preset current threshold [ΔI1] < Iq 目标 -Iq 实际 If the current is less than or equal to the second preset current threshold [ΔI2], then the frequency is reduced by the preset frequency adjustment reference value [ΔF].

[0157] If the second preset current threshold [ΔI2] < Iq 目标 -Iq 实际 If the current is less than or equal to the third preset current threshold [ΔI3], the frequency will decrease by 2 * the preset frequency adjustment reference value [ΔF].

[0158] If the third preset current threshold [ΔI3] < Iq 目标 -Iq 实际 If the frequency decreases by 4 * the preset frequency adjustment reference value [ΔF], then the frequency will decrease.

[0159] Specifically, by judging Iq 目标 andIq 实际 The difference adjustment frequency also includes the following steps:

[0160] After frequency adjustment,

[0161] If the adjusted frequency is > [F] 当前档位最大频率 If the frequency is adjusted, then the frequency = [F]. 当前档位最大频率 】;

[0162] If the adjusted frequency is < [F] 当前档位最小频率 If the frequency is adjusted, then the frequency = [F]. 当前档位最小频率 】

[0163] More specifically, in the step of obtaining the target frequency at the high gear through a limited number of compressor frequency adjustments, the Iq is determined... 目标 andIq实际 The difference adjustment frequency also includes the following steps:

[0164] After frequency adjustment,

[0165] If the adjusted frequency is > [F] 高档最大频率 If the frequency is adjusted, then the frequency = [F]. 高档最大频率 】;

[0166] If the adjusted frequency is < [F] 高档最小频率 If the frequency is adjusted, then the frequency = [F]. 高档最小频率 】

[0167] More specifically, in the step of obtaining the target frequency at the low gear through a limited number of compressor frequency adjustments, the Iq is determined... 目标 andIq 实际 The difference adjustment frequency also includes the following steps:

[0168] After frequency adjustment,

[0169] If the adjusted frequency is > [F] 低档最大频率 If the frequency is adjusted, then the frequency = [F]. 低档最大频率 】;

[0170] If the adjusted frequency is < [F] 低档最小频率 If the frequency is adjusted, then the frequency = [F]. 低档最小频率 】

[0171] Specifically, the adjustment termination condition is: satisfying |Iq| for three consecutive times. 目标 -Iq 实际 |≤First preset current threshold [ΔI1]; or, if the adjusted frequency > [F] is satisfied for 3 consecutive times. 当前档位最大频率 ]; or, if the adjusted frequency is less than [F] for three consecutive times. 当前档位最小频率 】; or, the cumulative number of adjustments reaches 15 times.

[0172] More specifically, in the step of obtaining the target frequency at the high gear through a limited number of compressor frequency adjustments, the adjustment termination condition is: satisfying |Iq| for three consecutive times. 目标 -Iq 实际 |≤First preset current threshold [ΔI1]; or, if the adjusted frequency > [F] is satisfied for 3 consecutive times. 高档最大频率 ]; or, if the adjusted frequency is less than [F] for three consecutive times. 高档最小频率 】; or, the cumulative number of adjustments reaches 15 times.

[0173] More specifically, in the step of obtaining the target frequency at the low gear through a finite number of compressor frequency adjustments, the adjustment termination condition is: satisfying |Iq| for three consecutive times. 目标 -Iq 实际|≤First preset current threshold [ΔI1]; or, if the adjusted frequency > [F] is satisfied for 3 consecutive times. 低档最大频率 ]; or, if the adjusted frequency is less than [F] for three consecutive times. 低档最小频率 】; or, the cumulative number of adjustments reaches 15 times.

[0174] Specifically, 0 < first preset current threshold [ΔI1] < second preset current threshold [ΔI2] < third preset current threshold [ΔI3].

[0175] Specifically, during the constant frequency table calculation in step S1, if a compressor shutdown command is received or a protection shutdown occurs, the compressor will stop. After the compressor restarts, the constant frequency table calculation in step S1 will be executed again.

[0176] Specifically, step S2 includes the following steps:

[0177] S21. Under other operating conditions (harsh or suitable conditions), the compressor is operated with one of the frequency settings in the constant frequency mode under moderate operating conditions as the initial setting, and the target frequency corresponding to the initial setting is the default frequency under other operating conditions.

[0178] S22. Real-time acquisition of the compressor's exhaust temperature;

[0179] S23. Determine whether the exhaust temperature is ≥ the exhaust temperature threshold; if yes, proceed to step S24; otherwise, proceed to step S25.

[0180] S24. Lowering the speed by one gear reduces the compressor frequency. If the exhaust temperature after lowering the speed by one gear is less than the exhaust temperature threshold, then the target frequency corresponding to the current speed is the appropriate frequency under other operating conditions.

[0181] S25. Increase the compressor frequency by one gear. If the exhaust temperature after increasing the gear by one gear is greater than or equal to the exhaust temperature threshold, then the target frequency corresponding to the initial gear is the appropriate frequency under other operating conditions.

[0182] Steps S21 to S25 are interconnected and work together. The detection and judgment of exhaust temperature in steps S22 and S23 help determine whether the compressor's high-temperature protection has been triggered. If the exhaust temperature is greater than or equal to the exhaust temperature threshold, it indicates that the compressor's high-temperature protection will be triggered. Then, proceed to step S24 to lower the compressor's frequency by one gear. If the exhaust temperature after lowering the frequency by one gear is less than the exhaust temperature threshold, the target frequency corresponding to the current gear is a suitable frequency for other operating conditions. If the exhaust temperature is less than the exhaust temperature threshold, it indicates that the compressor's high-temperature protection will not be triggered. Then, proceed to step S25 to raise the compressor's frequency by one gear. If the exhaust temperature after raising the frequency by one gear is greater than or equal to the exhaust temperature threshold, the target frequency corresponding to the initial gear is a suitable frequency for other operating conditions.

[0183] Specifically, step S24 includes the following steps:

[0184] S241, Lower the gear by one level;

[0185] S242, Obtain the exhaust temperature again;

[0186] S243. Determine whether the exhaust temperature is greater than the exhaust temperature threshold; if yes, proceed to step S244; if no, proceed to step S245.

[0187] S244. Lower the setting by one level until you obtain a suitable frequency for other operating conditions;

[0188] S245. The target frequency corresponding to the current gear is the appropriate frequency for other operating conditions.

[0189] Specifically, step S25 includes the following steps:

[0190] S251, Increase the gear by one level;

[0191] S252, Obtain the exhaust temperature again;

[0192] S253. Determine whether the exhaust temperature is ≥ the exhaust temperature threshold; if yes, proceed to step S254; if no, proceed to step S255.

[0193] S254. The target frequency corresponding to the initial gear position is the appropriate frequency under other operating conditions.

[0194] S255, then increase the setting by one level until a suitable frequency for other operating conditions is obtained.

[0195] Compared with the prior art, the compressor frequency adjustment method described in this embodiment has the following advantages:

[0196] 1) The compressor frequency adjustment method described in this embodiment allows developers to simply select different gears without frequently adjusting the specific frequency value of each gear, thus simplifying the operation process.

[0197] 2) The compressor frequency adjustment method described in this embodiment only requires the developer to select the gear, reducing the possibility of manually inputting the frequency and thus reducing the operational risk caused by input errors.

[0198] 3) The compressor frequency adjustment method described in this embodiment may require a quick switch to a specific frequency under different working conditions. The target frequency can be quickly adjusted by using a preset gear.

[0199] 4) The compressor frequency adjustment method described in this embodiment allows operators to ensure a consistent operating frequency on different devices by using the same gear, thereby standardizing the operating procedure.

[0200] 5) The compressor frequency adjustment method described in this embodiment can prevent operators from accidentally adjusting the frequency to an inappropriate range by setting a fixed target frequency, thereby improving the stability and reliability of the system.

[0201] Example 2

[0202] This embodiment proposes an air conditioner, which includes an indoor unit and an outdoor unit. The compressor of the outdoor unit uses a compressor frequency adjustment method as described in any one of Embodiment 1.

[0203] The air conditioner includes other related components in addition to the compressor. Since the specific structure and assembly relationship of these components are existing technologies, they will not be described in detail here.

[0204] The advantages of the air conditioner described above and the compressor frequency adjustment method described above compared to the prior art are the same, and will not be repeated here.

[0205] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A method for adjusting the frequency of a compressor, characterized in that, The method for adjusting the compressor frequency includes the following steps: S1. Under moderate operating conditions, set several levels for the compressor frequency, and obtain the target compressor frequency corresponding to each level under moderate operating conditions through a limited number of compressor frequency adjustments, thus obtaining the constant frequency mode frequency table under moderate operating conditions. S2. Under other operating conditions (harsh or suitable conditions), select one of the target frequencies corresponding to the constant frequency mode in the moderate operating condition frequency table as the default frequency for the compressor under other operating conditions. By adjusting the gear, the compressor frequency can be increased or decreased to obtain the suitable frequency for other operating conditions.

2. The method for adjusting the frequency of a compressor according to claim 1, characterized in that, Step S1 includes the following steps: S11. Under moderate operating conditions, the compressor frequency is set to several levels, including at least a high level, a low level, and other levels; first, the compressor is run at the default frequency under the high level, and the target frequency under the high level is obtained through a limited number of compressor frequency adjustments; then, the compressor is run at the default frequency under the low level, and the target frequency under the low level is obtained through a limited number of compressor frequency adjustments; or, the compressor is first run at the default frequency under the low level, and the target frequency under the low level is obtained through a limited number of compressor frequency adjustments; then, the compressor is run at the default frequency under the high level, and the target frequency under the high level is obtained through a limited number of compressor frequency adjustments. S12. Determine the target frequency for other gears.

3. The method for adjusting the compressor frequency according to claim 2, characterized in that, In step S11, obtaining the target frequency at the high gear through a finite number of compressor frequency adjustments includes the following steps: Obtain the initial frequency F0 to start the compressor; obtain the outdoor ambient temperature Ta; obtain the actual value Iq of the compressor's q-axis current. 实际 ; Calculate the target value Iq of the compressor q-axis current. 目标 By judging Iq 目标 andIq 实际 Adjust the frequency difference and repeat the above process until the adjustment end condition is met to obtain the target frequency of the high gear.

4. The method for adjusting the compressor frequency according to claim 2, characterized in that, In step S11, obtaining the target frequency at the low gear through a finite number of compressor frequency adjustments includes the following steps: Obtain the initial frequency F0 to start the compressor; obtain the outdoor ambient temperature Ta; obtain the actual value Iq of the compressor's q-axis current. 实际 ; Calculate the target value Iq of the compressor q-axis current. 目标 By judging Iq 目标 andIq 实际 Adjust the frequency difference and repeat the above process until the adjustment end condition is met to obtain the target frequency of the low gear.

5. A method for adjusting the frequency of a compressor according to claim 2, characterized in that, In step S12, the target frequency for other gears is determined by the difference method.

6. The method for adjusting the frequency of a compressor according to claim 1, characterized in that, Step S2 includes the following steps: S21. Under other operating conditions (harsh or suitable conditions), the compressor is operated with one of the frequency settings in the constant frequency mode under moderate operating conditions as the initial setting, and the target frequency corresponding to the initial setting is the default frequency under other operating conditions. S22. Real-time acquisition of compressor discharge temperature; S23. Determine whether the exhaust temperature is ≥ the exhaust temperature threshold; if yes, proceed to step S24; otherwise, proceed to step S25. S24. Lowering the speed by one gear reduces the compressor frequency. If the exhaust temperature after lowering the speed by one gear is less than the exhaust temperature threshold, then the target frequency corresponding to the current speed is the appropriate frequency under other operating conditions. S25. Increase the compressor frequency by one gear. If the exhaust temperature after increasing the gear by one gear is greater than or equal to the exhaust temperature threshold, then the target frequency corresponding to the initial gear is the appropriate frequency under other operating conditions.

7. A method for adjusting the frequency of a compressor according to claim 3 or 4, characterized in that, Iq 目标 =A×F0+B; Based on the outdoor ambient temperature Ta, look up the corresponding A and B values ​​in the table.

8. A method for adjusting the frequency of a compressor according to claim 3 or 4, characterized in that, By judging Iq 目标 andIq 实际 The frequency adjustment for the difference specifically includes the following steps: If |Iq 目标 -Iq 实际 If |≤ the first preset current threshold [ΔI1], then the frequency will not be adjusted; If the first preset current threshold [ΔI1] < Iq 目标 -Iq 实际 If the current is less than or equal to the second preset current threshold [ΔI2], then the frequency increases by the preset frequency adjustment reference value [ΔF]. If the second preset current threshold [ΔI2] < Iq 目标 -Iq 实际 If the current is less than or equal to the third preset current threshold [ΔI3], the frequency will increase by 2 * the preset frequency adjustment reference value [ΔF]. If the third preset current threshold [ΔI3] < Iq 目标 -Iq 实际 The frequency will increase by 4 * the preset frequency adjustment reference value [ΔF]. If the first preset current threshold [ΔI1] < Iq 目标 -Iq 实际 If the current is less than or equal to the second preset current threshold [ΔI2], then the frequency is reduced by the preset frequency adjustment reference value [ΔF]. If the second preset current threshold [ΔI2] < Iq 目标 -Iq 实际 If the current is less than or equal to the third preset current threshold [ΔI3], the frequency will decrease by 2 * the preset frequency adjustment reference value [ΔF]. If the third preset current threshold [ΔI3] < Iq 目标 -Iq 实际 If the frequency decreases by 4 * the preset frequency adjustment reference value [ΔF], then the frequency will decrease.

9. A method for adjusting the frequency of a compressor according to claim 3 or 4, characterized in that, The adjustment termination condition is: |Iq| is satisfied three times consecutively. 目标 -Iq 实际 |≤First preset current threshold [ΔI1]; or, if the adjusted frequency > [F] is satisfied for 3 consecutive times. 当前档位最大频率 ]; or, if the adjusted frequency is less than [F] for three consecutive times. 当前档位最小频率 】; or, the cumulative number of adjustments reaches 15.

10. An air conditioner, characterized in that, The air conditioner includes an indoor unit and an outdoor unit, and the compressor of the outdoor unit uses a compressor frequency adjustment method according to any one of claims 1 to 9.

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