A control method and device of a compressor, the compressor and a readable storage medium

Abstract

This invention provides a compressor control method, apparatus, compressor, and readable storage medium, comprising: acquiring the compressor's frequency-limited discharge temperature T. 限 The initial target frequency P0; the initial discharge temperature T0 of the compressor, and the discharge temperature T when the compressor reaches the initial target frequency P0. P According to the frequency-limited exhaust temperature T 限 The compressor reaches the frequency-limited discharge temperature T from the initial discharge temperature T0. 限 The first heating rate α1 and the compressor's temperature rise from the initial discharge temperature T0 to the final discharge temperature T P The second heating rate α2 is used to determine the critical discharge temperature T of the compressor. § According to the critical exhaust temperature T § This invention controls the operating frequency of the compressor. The critical discharge temperature T of the compressor is used as the control factor. § Control the rate of temperature rise and fall of the exhaust gas to prevent large fluctuations in the compressor exhaust temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioners, and in particular, the present application relates to a control method and device of a compressor, a compressor and an air conditioner. BACKGROUND

[0002] With the gradual improvement of people's living standards, air conditioners have gradually become one of the commonly used electrical appliances in people's daily life, especially multi-connected air conditioning units, which have been increasingly favored by people in recent years. A multi-connected air conditioning unit is a kind of air conditioning unit in which one outdoor unit can be connected to multiple indoor units, and through controlling the refrigerant circulation amount of the compressor and the refrigerant flow into each heat exchanger, the indoor cooling and heating load requirements can be met in time.

[0003] However, some multi-connected outdoor units have the phenomenon of fast frequency increase during the starting process, which causes the exhaust temperature of the compressor to rise quickly, and the compressor reaches the temperature limit frequency interval more quickly. When the temperature limit frequency interval is reached, the frequency reduction reaction is slow, and the exhaust temperature continues to rise, thereby causing the exhaust protection fault shutdown and affecting the normal use of customers. Therefore, how to control the compressor to run smoothly after starting has been the goal pursued by researchers in the field. SUMMARY

[0004] The present application aims to solve at least one of the above technical problems.

[0005] To this end, the first object of the present application is to provide a control method of a compressor.

[0006] The second object of the present application is to provide a control device of a compressor.

[0007] The third object of the present application is to provide a compressor.

[0008] The fourth object of the present application is to provide an air conditioner.

[0009] To achieve the first object of the present application, the present application provides a control method of a compressor, comprising: obtaining a limit frequency exhaust temperature T 限 and an initial target frequency P0 of the compressor; detecting an initial exhaust temperature T0 of the compressor, and an arrival exhaust temperature T P when the compressor reaches the initial target frequency P0; determining a critical exhaust temperature T § of the compressor according to the limit frequency exhaust temperature T 限 , a first temperature rise rate a1 of the compressor from the initial exhaust temperature T0 to the limit frequency exhaust temperature T 限 , and a second temperature rise rate a2 of the compressor from the initial exhaust temperature T0 to the arrival exhaust temperature T P ; and controlling the operating frequency of the compressor according to the critical exhaust temperature T § .

[0010] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: by setting one of the critical exhaust temperature T 限 A certain distance § , the critical exhaust temperature T § is reached, and the compressor exhaust temperature is controlled, so that the compressor reaches the frequency limiting exhaust temperature T 限 , which needs more time, so that there is sufficient time to control the frequency of the compressor, so that the compressor can run smoothly after starting, and will not be stopped due to exhaust protection failure, thereby affecting normal use.

[0011] In the above technical scheme, the first temperature rise rate α1 is obtained by the following formula:

[0012]

[0013] Wherein, △S is the time used from the initial exhaust temperature T0 to reach the exhaust frequency limiting temperature T 限 .

[0014] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: the first temperature rise rate α1 is the temperature rise rate of the compressor from the initial exhaust temperature T0 to reach the frequency limiting exhaust temperature T 限 , that is, the difference between the frequency limiting exhaust temperature T 限 and the initial exhaust temperature T0 and the time △S used from the initial exhaust temperature T0 to reach the exhaust frequency limiting temperature T 限 , the first temperature rise rate α1 obtained by the formula is accurate and simple to calculate, and is easy to obtain.

[0015] In any of the above technical schemes, the second temperature rise rate α2 is obtained by the following formula:

[0016]

[0017] Wherein, △S1 is the time required from the initial exhaust temperature T0 to reach the initial exhaust temperature T P .

[0018] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: the second temperature rise rate α2 is the temperature rise rate of the compressor from the initial exhaust temperature T0 to reach the exhaust temperature T P , that is, the difference between the exhaust temperature T P and the initial exhaust temperature T0 and the time △S1 used from the initial exhaust temperature T0 to reach the exhaust temperature T P , the second temperature rise rate α2 obtained by the formula is accurate and simple to calculate, and is easy to obtain.

[0019] In any of the above technical schemes, the critical exhaust temperature T § is obtained by the following formula:

[0020]

[0021] Where A is the first correction factor.

[0022] Compared with existing technologies, the technical effect achieved by this technical solution is that the critical exhaust temperature T can be calculated using the first heating rate α1 and the second heating rate α2. § To achieve the critical exhaust temperature T § For a more accurate result, multiply by the first correction factor A, thus obtaining the critical exhaust temperature T. § The degree is relatively reasonable, which can fully guarantee the slowdown of the exhaust temperature rise rate, so as to allow enough time to control the compressor frequency.

[0023] In any of the above technical solutions, based on the critical exhaust temperature T § Controlling the compressor's operating frequency specifically includes: based on the critical discharge temperature T § Determine the compressor's frequency ramp rate β1; control the compressor to reach the critical discharge temperature T. § Then, increase the frequency according to the up-frequency rate β1.

[0024] Compared with existing technologies, the technical effects achieved by this technical solution are: when the compressor's exhaust temperature reaches the critical exhaust temperature T... § Afterwards, the compressor still needs to increase its frequency for a period of time. At this time, the frequency increase rate is β1, and the compressor continues to run at the frequency increase rate β1 until the compressor's discharge temperature reaches the frequency-limited discharge temperature T. 限 Controlling the compressor operation according to the frequency increase rate can make the compressor frequency rise appropriately.

[0025] In any of the above technical solutions, the upsampling rate β1 is obtained by the following formula:

[0026]

[0027] Where B is the second correction coefficient, β0 is the initial frequency ramp-up rate of the compressor; α2 is the second heating rate, and α3 is the rate at which the compressor reaches its critical discharge temperature T. § The third heating rate after that.

[0028] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: the frequency increase rate β1 calculated by the above formula is more suitable and will not cause the compressor to increase its frequency too quickly, thus preventing malfunctions; at the same time, the formula also uses a second correction coefficient B, which makes the obtained frequency increase rate β1 result more accurate, thereby enabling better control of the compressor frequency increase.

[0029] In any of the above technical solutions, the initial up-frequency rate β0 is obtained by the following formula:

[0030]

[0031] Where △S1 is the initial exhaust temperature T0 reaching the initial exhaust temperature T P The time required.

[0032] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: the initial up-frequency rate β0 is equal to the initial target frequency P0 and the initial exhaust temperature T0, reaching the initial exhaust temperature T. P The ratio of the required time ΔS1 to the initial up-rate β0 obtained using the above formula is more accurate, thus making the obtained up-rate β1 more accurate as well.

[0033] In any of the above technical solutions, the third heating rate α3 is obtained by the following formula:

[0034]

[0035] Where C is the third correction factor.

[0036] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: the third heating rate α2 is the rate at which the compressor reaches its critical discharge temperature T. § The subsequent heating rate is determined by the second heating rate α2 and the critical exhaust temperature T. § and frequency-limited exhaust temperature T 限 To make the calculation results more accurate, a third correction coefficient C is also used in the formula to make the obtained third heating rate α3 more accurate, thereby making the obtained frequency increase rate β1 more accurate.

[0037] In any of the above technical solutions, after frequency increase at a rate β1, the critical exhaust temperature T is determined. § Controlling the compressor's operating frequency also includes: based on the critical temperature T § Given the frequency ramp rate β1, determine the compressor's frequency ramp rate β2; control the compressor to reach the frequency ramp discharge temperature T. 降 Then, the frequency is reduced according to the reduction rate β2.

[0038] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: when the exhaust temperature reaches the frequency-reduced exhaust temperature T... 降 After that, frequency reduction will inevitably be triggered when the compressor reaches the frequency-limited discharge temperature T. 限 After the frequency stabilizes, changes in the external environment cause the exhaust temperature to continue to rise slowly, eventually reaching the reduced-frequency exhaust temperature T. 降 In order to quickly reduce the exhaust temperature, the compressor frequency is controlled to decrease at this time.

[0039] In any of the above technical solutions, the frequency reduction rate β2 is obtained by the following formula:

[0040]

[0041] Where D is the fourth correction factor.

[0042] Compared with existing technologies, the technical effect achieved by this technical solution is that the absolute value of the compressor frequency reduction rate β2 should be greater than that of the compressor from the critical discharge temperature T. § Rise to frequency-limited exhaust temperature T 限 The frequency rise rate β1 is related to the critical exhaust temperature T. § The frequency reduction rate β2 obtained by correlation can achieve a better frequency reduction effect by controlling the compressor frequency reduction, thereby enabling the compressor to operate smoothly. In order to make the result of frequency reduction rate β2 more accurate, a fourth correction coefficient D is used to correct the result, so as to achieve a better control effect of compressor frequency reduction.

[0043] To achieve the second objective of this invention, this invention provides a compressor control device, comprising: an acquisition module for acquiring the compressor's frequency-limited discharge temperature T. 限 The initial target frequency P0; a detection module, used to detect the temperature T0 when the compressor starts to discharge and the discharge temperature T when it reaches the initial target frequency P0. P ; Calculation module, the calculation module is used to calculate the frequency-limited exhaust temperature T 限 The compressor reaches the frequency-limited discharge temperature T from the initial discharge temperature T0. 限 The first heating rate α1 and the compressor's temperature rise from the initial discharge temperature T0 to the final discharge temperature T P The second heating rate α2 is used to determine the critical discharge temperature T of the compressor. § The control module is used to determine the critical exhaust temperature T. § Control the operating frequency of the compressor.

[0044] The compressor control device of the present invention can realize the compressor control method of any technical solution of the present invention. The compressor control device of the present invention has all the beneficial effects of the compressor control method of any technical solution of the present invention, which will not be repeated here.

[0045] To achieve the third objective of this invention, this invention provides a compressor capable of executing a control method as described in any of the above technical solutions.

[0046] The compressor of the present invention can realize the control method as described in any technical solution of the present invention, and the compressor of the present invention has all the beneficial effects of the control method as described in any technical solution of the present invention, which will not be repeated here.

[0047] To achieve the fourth objective of this invention, this invention provides a readable storage medium, which includes: a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement a control method as described in any of the above technical solutions.

[0048] The readable storage medium of the present invention can implement the control method as described in any of the technical solutions of the present invention, and the readable storage medium of the present invention has all the beneficial effects of the control method as described in any of the technical solutions of the present invention, which will not be repeated here.

[0049] By adopting the technical solution of the present invention, the following technical effects can be achieved:

[0050] 1. The critical discharge temperature T of the compressor § Control the rate of exhaust temperature rise and fall to prevent large fluctuations in compressor exhaust temperature;

[0051] 2. Control the compressor's frequency ramp-up rate β1 and frequency ramp-down rate β2 to enable the compressor to reach stable operation more quickly. Attached Figure Description

[0052] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 This is a flowchart of the compressor control method according to an embodiment of the present invention;

[0054] Figure 2 This is a schematic diagram of the control device for the compressor according to an embodiment of the present invention.

[0055] Explanation of reference numerals in the attached figures:

[0056] 100 - Control device; 110 - Acquisition module; 120 - Detection module; 130 - Calculation module; 140 - Control module. Detailed Implementation

[0057] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0058] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0059] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the following description is provided in conjunction with... Figure 1 and Figure 2 Specific embodiments of the present invention will be described in detail below.

[0060] like Figure 1 As shown, an embodiment of the present invention provides a compressor control method, including:

[0061] S100, Obtain the compressor's frequency-limited discharge temperature T 限 and the initial target frequency P0;

[0062] S200, detects the initial discharge temperature T0 of the compressor, and the discharge temperature T when the compressor reaches the initial target frequency P0. P ;

[0063] S300, based on the frequency-limited exhaust temperature T 限 The compressor reaches the frequency-limited discharge temperature T from the initial discharge temperature T0. 限 The first heating rate α1 and the compressor's temperature rise from the initial discharge temperature T0 to the final discharge temperature T P The second heating rate α2 is used to determine the critical discharge temperature T of the compressor. § ;

[0064] S400, based on the critical exhaust temperature T § Control the operating frequency of the compressor.

[0065] In related technologies, multi-split outdoor units exhibit a rapid frequency increase during startup, causing the compressor exhaust temperature to rise quickly. When the temperature reaches the frequency limiting range, the frequency limiting and reduction responses are slow, resulting in a continuous rise in exhaust temperature. This leads to exhaust protection failure and shutdown, affecting normal customer use.

[0066] In view of this, the present invention determines the critical discharge temperature T of the compressor. § This is used to control the operating frequency of the compressor, thereby enabling the compressor to operate smoothly.

[0067] Specifically, the compressor's frequency-limited discharge temperature T is obtained. 限 The initial discharge temperature T0 of the compressor and the discharge temperature T0 when the compressor reaches the initial target frequency P0 are detected by a temperature sensor or thermometer. P The initial exhaust temperature T0 to the frequency-limited exhaust temperature T are obtained respectively. 限and the initial exhaust temperature T0 to the reached exhaust temperature T P The critical exhaust temperature T can be obtained by determining the heating rate, i.e., the first heating rate α1 and the second heating rate α2. § Then, based on the critical exhaust temperature T... § By controlling the operating frequency of the compressor, the compressor can be made to run smoothly.

[0068] Preferably, the compressor typically reaches the frequency-limited discharge temperature T. 限 The compressor frequency is only controlled at a certain time, but this results in a short controllable time, and the compressor's operating frequency cannot be fully controlled. A frequency-limiting discharge temperature T is then set. 限 Critical exhaust temperature T at a certain distance § This allows the critical exhaust temperature T to be reached. § The compressor discharge temperature is controlled from the start to ensure that the compressor reaches the frequency-limited discharge temperature T. 限 It requires more time to allow sufficient time to control the compressor frequency, ensuring that the compressor can run smoothly after startup and will not stop due to exhaust protection failure, thus affecting normal use.

[0069] Preferably, the frequency-limited exhaust temperature T 限 The preferred temperature is 80℃~90℃, and the preferred initial target frequency P0 is 15Hz~30Hz.

[0070] It should be noted that the steps S100 to S400 described in the embodiments of the present invention are not limited to a specific order, but are only for the convenience of description and do not represent a sequential relationship.

[0071] In some embodiments of the present invention, the first heating rate α1 is obtained by the following formula:

[0072]

[0073] Where △S is the initial exhaust temperature T0 reaching the exhaust frequency limiting temperature T 限 The time taken.

[0074] Preferably, the first heating rate α1 is the rate at which the compressor reaches the frequency-limited exhaust temperature T from the initial exhaust temperature T0. 限 The heating rate is the frequency-limited exhaust temperature T. 限 The difference between the initial exhaust temperature T0 and the exhaust frequency limiting temperature T0 reached by the initial exhaust temperature T0. 限 The ratio of the time ΔS used, the first heating rate α1 obtained by this formula is accurate and easy to calculate, and readily available.

[0075] In some embodiments of the present invention, the second heating rate α2 is obtained by the following formula:

[0076]

[0077] Where △S1 is the initial exhaust temperature T0 reaching the initial exhaust temperature T P The time required.

[0078] Preferably, the second heating rate α2 is the rate at which the compressor reaches the discharge temperature T from the initial discharge temperature T0. P The rate of heating is the rate at which the exhaust temperature T is reached. P The difference between the initial exhaust temperature T0 and the initial exhaust temperature T0 reaching the exhaust temperature T P The ratio of the time ΔS1 used, the second heating rate α2 obtained by this formula is accurate and easy to calculate, and readily available.

[0079] In some embodiments of the present invention, the critical exhaust temperature T § It can be obtained through the following formula:

[0080]

[0081] Where A is the first correction factor.

[0082] Preferably, the critical exhaust temperature T can be calculated using the first heating rate α1 and the second heating rate α2. § To achieve the critical exhaust temperature T § For a more accurate result, multiply by the first correction factor A, thus obtaining the critical exhaust temperature T. § The degree is relatively reasonable, which can fully guarantee the slowdown of the exhaust temperature rise rate, so as to allow enough time to control the compressor frequency.

[0083] Preferably, the first correction coefficient A is an empirical value, and its range is preferably 0 to 1, which can make the obtained critical exhaust temperature T § The value is more accurate.

[0084] In some embodiments of the present invention, based on the critical exhaust temperature T § Controlling the compressor's operating frequency specifically includes: based on the critical discharge temperature T § Determine the compressor's frequency ramp rate β1; control the compressor to reach the critical discharge temperature T. § Then, increase the frequency according to the up-frequency rate β1.

[0085] Preferably, the compressor discharge temperature reaches the critical discharge temperature T. § Afterwards, the compressor's discharge temperature is not very high, and the compressor still needs to operate at a higher frequency for a period of time. At this time, the frequency increase rate is β1, and the compressor continues to run at the frequency increase rate β1, so that the compressor's discharge temperature continues to rise to the frequency-limited discharge temperature T. 限Controlling the compressor operation according to the frequency increase rate can ensure that the compressor frequency increases appropriately, preventing the compressor's exhaust temperature from rising too quickly and causing the compressor to shut down for protection.

[0086] In some embodiments of the present invention, the upsampling rate β1 is obtained by the following formula:

[0087]

[0088] Where B is the second correction coefficient, β0 is the initial frequency ramp-up rate of the compressor; α2 is the second heating rate, and α3 is the rate at which the compressor reaches its critical discharge temperature T. § The third heating rate after that.

[0089] Preferably, the frequency ramp rate β1 obtained by the above formula is more suitable and will not cause the compressor to ramp up too quickly and cause failure. At the same time, the formula also uses a second correction coefficient B to make the obtained frequency ramp rate β1 result more accurate, thereby enabling better control of the compressor frequency ramp.

[0090] Preferably, the value of the second correction coefficient B is in the range of 0 to 1, which can make the obtained up-rate β1 value more accurate.

[0091] It should be noted that the initial frequency ramp rate β0 can be a set value or determined according to the actual operating conditions of the compressor. When the initial frequency ramp rate β0 is determined according to the actual operating conditions of the compressor, the initial frequency ramp rate β0 is obtained by calculation.

[0092] In some embodiments of the present invention, the initial up-rate β0 is obtained by the following formula:

[0093]

[0094] Where △S1 is the initial exhaust temperature T0 reaching the initial exhaust temperature T P The time required.

[0095] Preferably, the initial boost rate β0 is the sum of the initial target frequency P0 and the initial exhaust temperature T0 reaching the initial exhaust temperature T. P The ratio of the required time ΔS1 to the initial up-rate β0 obtained using the above formula is more accurate, thus making the obtained up-rate β1 more accurate as well.

[0096] In some embodiments of the present invention, the third heating rate α3 is obtained by the following formula:

[0097]

[0098] Where C is the third correction factor.

[0099] Preferably, the third heating rate α2 is the rate at which the compressor reaches its critical discharge temperature T. § The subsequent heating rate is determined by the second heating rate α2 and the critical exhaust temperature T. § and frequency-limited exhaust temperature T 限 To make the calculation results more accurate, a third correction coefficient C is also used in the formula to make the obtained third heating rate α3 more accurate, thereby making the obtained frequency increase rate β1 more accurate.

[0100] Preferably, the value range of the third correction coefficient C is 0 to 1, which can make the obtained value of the third heating rate α3 more accurate.

[0101] In some embodiments of the present invention, after frequency upsampling at a rate β1, the critical exhaust temperature T is determined. § Controlling the compressor's operating frequency also includes: based on the critical temperature T § Given the frequency ramp rate β1, determine the compressor's frequency ramp rate β2; control the compressor to reach the frequency ramp discharge temperature T. 降 Then, the frequency is reduced according to the reduction rate β2.

[0102] Preferably, when the exhaust temperature reaches the reduced-frequency exhaust temperature T 降 After that, frequency reduction will inevitably be triggered when the compressor reaches the frequency-limited discharge temperature T. 限 After the frequency stabilizes, changes in the external environment cause the exhaust temperature to continue to rise slowly, eventually reaching the reduced-frequency exhaust temperature T. 降 In order to quickly reduce the exhaust temperature, the compressor frequency is controlled to decrease at this time.

[0103] Preferably, when the frequency reduction exhaust temperature T is reached... 降 After that, the compressor frequency remains unchanged. At this time, the compressor's exhaust temperature may drop slightly, and then be finely adjusted to a stable level. The control method of this invention will not be executed again. The main purpose of the control method of this invention is to control the stability of the start-up process and prevent the machine from shutting down immediately after startup.

[0104] In some embodiments of the present invention, the down-frequency rate β2 is obtained by the following formula:

[0105]

[0106] Where D is the fourth correction factor.

[0107] Preferably, the absolute value of the compressor frequency reduction rate β2 should be greater than the compressor's frequency reduction rate from the critical discharge temperature T. § Rise to frequency-limited exhaust temperature T 限 The frequency rise rate β1 is related to the critical exhaust temperature T. §The frequency reduction rate β2 obtained by correlation can achieve a better frequency reduction effect by controlling the compressor frequency reduction, thereby enabling the compressor to operate smoothly. In order to make the result of frequency reduction rate β2 more accurate, a fourth correction coefficient D is used to correct the result, so as to achieve a better control effect of compressor frequency reduction.

[0108] Preferably, the frequency reduction exhaust temperature T 降 The preferred temperature is 100℃~110℃, and the fourth correction coefficient D is preferably -5~-10, which can make the obtained frequency reduction rate β2 more accurate.

[0109]

Example 1

[0110] With the machine running at full capacity, the compressor's frequency-limited discharge temperature T is obtained based on the compressor model. 限 The initial discharge temperature is 30℃, and the compressor reaches the discharge frequency limiting temperature T0 at a temperature of 90℃. According to design requirements, the initial discharge temperature T0 is 30℃. 限 The time ΔS used is 300s, therefore the first heating rate α1 during the entire frequency increase process is calculated to be 0.2℃ / s.

[0111] After powering on, determine the initial target frequency P0 of the compressor to be 50Hz based on the compressor model. The compressor reaches the discharge temperature T0 from the difference between the initial discharge temperature T0 and the initial discharge temperature T0. P The time ΔS1 taken is 60s to reach the exhaust temperature T. P With a temperature of 45℃, the second heating rate α2 is 0.25℃ / s, and the initial frequency ramp rate β0 is 0.83Hz / s.

[0112] The first correction factor A is empirically set to 0.98. The critical discharge temperature T of the compressor can be obtained from the above data. § The temperature is 70℃, based on the critical exhaust temperature T. § The second correction factor B is empirically set to 0.8, resulting in a frequency rise rate β1 of 0.4 Hz / s. The third correction factor C is empirically set to 0.77, and the third heating rate α3 is 0.15 ℃ / s.

[0113] The compressor exhaust temperature reaches the critical exhaust temperature T. § Then, the frequency is increased at the rate β1 until the exhaust temperature reaches the frequency-limited exhaust temperature T. 限 Alternatively, if the compressor is operating at full frequency, maintain that frequency. The exhaust temperature will continue to rise until it reaches the reduced-frequency exhaust temperature T. 降 The temperature is 107℃. Based on the above data and the empirically chosen value of the fourth correction factor D (-5.1), the compressor's frequency reduction rate β2λ is -0.9Hz / s. The compressor is controlled to reduce its frequency at this rate until the exhaust temperature drops to the frequency-limited exhaust temperature T. 限 until.

[0114]

Example 2

[0115] With the machine running at full capacity, the compressor's frequency-limited discharge temperature T is obtained based on the compressor model. 限 The initial discharge temperature is 25℃, and the compressor reaches the discharge frequency limiting temperature T0 at 80℃. 限 The time ΔS used was 270s, therefore the first heating rate α1 during the entire frequency increase process was calculated to be 0.2℃ / s.

[0116] After powering on, determine the initial target frequency P0 of the compressor to be 30Hz based on the compressor model. The compressor reaches the discharge temperature T0 from the difference between the initial discharge temperature T0 and the initial discharge temperature T0. P The time ΔS1 taken is 60s to reach the exhaust temperature T. P With a temperature of 40℃, the second heating rate α2 can be calculated to be 0.25℃ / s, and the initial frequency ramp rate β0 is 0.5Hz / s.

[0117] The first correction factor A is empirically set to 0.89. The critical discharge temperature T of the compressor can be obtained from the above data. § The temperature is 57℃, based on the critical exhaust temperature T. § The second correction factor B is empirically set to 0.8, resulting in a frequency rise rate β1 of 0.2 Hz / s. The third correction factor C is empirically set to 0.7, and the third heating rate α3 is 0.12 ℃ / s.

[0118] The compressor exhaust temperature reaches the critical exhaust temperature T. § Then, the frequency is increased at the rate β1 until the exhaust temperature reaches the frequency-limited exhaust temperature T. 限 Alternatively, if the compressor is operating at full frequency, maintain that frequency. The exhaust temperature will continue to rise until it reaches the reduced-frequency exhaust temperature T. 降 Given a temperature of 105℃, and based on the above data and the empirically chosen value of the fourth correction factor D (-5.5), the compressor's frequency reduction rate β2λ is -0.6Hz / s. The compressor is controlled to reduce its frequency at this rate until the exhaust temperature drops to the frequency-limited exhaust temperature T. 限 until.

[0119]

Example 3

[0120] With the machine running at full capacity, the compressor's frequency-limited discharge temperature T is obtained based on the compressor model. 限 The initial discharge temperature is 28℃, and the compressor reaches the discharge frequency limiting temperature T0 at 85℃. According to design requirements, the initial discharge temperature T0 is 28℃. 限 The time ΔS used was 290s, therefore the first heating rate α1 during the entire frequency increase process was calculated to be 0.2℃ / s.

[0121] After powering on, determine the initial target frequency P0 to be 20Hz based on the compressor model. The compressor starts from the difference between the initial discharge temperature T0 and the initial discharge temperature T0 to reach the discharge temperature T. P The time ΔS1 taken is 55s to reach the exhaust temperature T. P With a temperature of 40℃, the second heating rate α2 is 0.22℃ / s, and the initial frequency ramp rate β0 is 0.36Hz / s.

[0122] The first correction factor A is empirically set to 0.9. The critical discharge temperature T of the compressor can be obtained from the above data. § The temperature is 70℃, based on the critical exhaust temperature T. § The second correction factor B is empirically set to 0.75, resulting in a frequency rise rate β1 of 0.18 Hz / s. The third correction factor C is empirically set to 0.8, resulting in a third heating rate α3 of 0.14 ℃ / s.

[0123] The compressor exhaust temperature reaches the critical exhaust temperature T. § Then, the frequency is increased at the rate β1 until the exhaust temperature reaches the frequency-limited exhaust temperature T. 限 Alternatively, if the compressor is operating at full frequency, maintain that frequency. The exhaust temperature will continue to rise until it reaches the reduced-frequency exhaust temperature T. 降 The temperature is 103℃. Based on the above data and the empirically chosen value of the fourth correction factor D (-6.1), the compressor's frequency reduction rate β2λ is -0.76Hz / s. The compressor is controlled to reduce its frequency at this rate until the exhaust temperature drops to the frequency-limited exhaust temperature T. 限 until.

[0124]

Example 4

[0125] like Figure 2 As shown, an embodiment of the present invention provides a compressor control device 100, including: an acquisition module 110, used to acquire the compressor's frequency-limited discharge temperature T. 限 The initial target frequency P0; detection module 120 is used to detect the temperature T0 when the compressor starts to discharge and the discharge temperature T when the initial target frequency P0 is reached. P ; Calculation module 130, the calculation module 130 is used to calculate the frequency-limited exhaust temperature T 限 The compressor reaches the frequency-limited discharge temperature T from the initial discharge temperature T0. 限 The first heating rate α1 and the compressor's temperature rise from the initial discharge temperature T0 to the final discharge temperature T P The second heating rate α2 is used to determine the critical discharge temperature T of the compressor. § Control module 140, the control module 140 is used to determine the critical exhaust temperature T. § Control the operating frequency of the compressor.

[0126] Preferably, the compressor obtains the compressor's frequency-limited discharge temperature T through the acquisition module 110. 限 The initial target frequency P0 is detected by the detection module 120, which detects the temperature T0 when the compressor starts to discharge and the discharge temperature T when it reaches the initial target frequency P0. P The difference between the initial discharge temperature T0 and the initial discharge temperature T0 reaching the discharge frequency limiting temperature T 限 The time ΔS used and the time required for the compressor to heat from the initial discharge temperature T0 to the reached discharge temperature T P The required time △S1, the results of the acquisition module 110 and the detection module 120 are transmitted to the calculation module 130 for calculation, and the calculation is used to determine the compressor's temperature from the initial exhaust temperature T0 to the frequency-limited exhaust temperature T. 限 The first heating rate α1 and the compressor from the initial exhaust temperature T0 to the exhaust temperature T P The second heating rate α2 is used to calculate and determine the critical discharge temperature T of the compressor. § Then, the control module 140 calculates the critical exhaust temperature T based on the calculation module 130. § This is used to control the operating frequency of the compressor.

[0127] Preferably, the calculation module 130 can also calculate the compressor's initial frequency ramp-up rate β0 and the compressor reaching its critical discharge temperature T. § The third heating rate α3, based on the results from the calculation module 130, can be determined by the control module 140 to be related to the compressor's critical discharge temperature T. § The associated boost rate β1 and deboost rate β2 are used to control the operating frequency of the compressor. The control module 140 controls the operating frequency of the compressor based on the obtained boost rate β1 and deboost rate β2 of the compressor.

[0128]

Example 5

[0129] Embodiments of the present invention provide a compressor capable of performing the control method as described in any of the above embodiments.

[0130] Preferably, the compressor's operating frequency is controlled by a control device, and the compressor's frequency-limited discharge temperature T is obtained first. 限 The initial target frequency P0 is then used to detect the initial discharge temperature T0 of the compressor and the discharge temperature T0 when the compressor reaches the initial target frequency P0, using a temperature sensor or thermometer. P Then, obtain the initial exhaust temperature T0 to the frequency-limited exhaust temperature T. 限 and the initial exhaust temperature T0 to the reached exhaust temperature T P The critical exhaust temperature T can be obtained by determining the heating rate, i.e., the first heating rate α1 and the second heating rate α2.§ Then, based on the critical exhaust temperature T... § By obtaining the third heating rate α3, acquiring the initial frequency increase rate β0, determining the compressor's frequency increase rate β1 and frequency decrease rate β2, and controlling the compressor to increase or decrease the frequency according to the frequency increase rate β1 and frequency decrease rate β2, the compressor can operate smoothly.

[0131]

Example 6

[0132] Embodiments of the present invention provide a readable storage medium, which includes: a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the control method as described in any of the above embodiments.

[0133] Preferably, the readable storage medium has a processor that can control the operation of the compressor and limit the discharge temperature T. 限 The initial target frequency P0 is stored in the memory of a readable storage medium, along with the detected initial discharge temperature T0 of the compressor and the discharge temperature T when the compressor reaches the initial target frequency P0. P The detection results are then transmitted to the processor for analysis and calculation to obtain the first heating rate α1, the second heating rate α2, and the critical exhaust temperature T. § Then, based on the critical exhaust temperature T § The third heating rate α3, the frequency increase rate β1, and the frequency decrease rate β2 are obtained, thereby controlling the compressor to operate smoothly.

[0134] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0135] 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 controlling a compressor, characterized in that, include: Obtain the frequency-limited exhaust temperature T of the compressor. 限 and the initial target frequency P0; The initial discharge temperature T0 of the compressor is detected, as well as the discharge temperature T0 reached when the compressor reaches the initial target frequency P0. P ; According to the frequency-limited exhaust temperature T 限 The compressor reaches the frequency-limited exhaust temperature T from the initial exhaust temperature T0. 限 The first heating rate α1 and the compressor reaching the final exhaust temperature T from the initial exhaust temperature T0 P The second heating rate α2 is used to determine the critical discharge temperature T of the compressor. § ; According to the critical exhaust temperature T § Control the operating frequency of the compressor; The first heating rate α1 is obtained by the following formula: ； Wherein, △S represents the initial exhaust temperature T0 reaching the frequency-limited exhaust temperature T. 限 The time taken; The second heating rate α2 is obtained by the following formula: ； Wherein, △S1 is the initial exhaust temperature T0 reaching the final exhaust temperature T P Time required; The critical exhaust temperature T § It can be obtained through the following formula: ； Where A is the first correction factor.

2. The control method according to claim 1, characterized in that, The critical exhaust temperature T § Controlling the operating frequency of the compressor specifically includes: According to the critical exhaust temperature T § Determine the frequency ramp rate of the compressor. ; Control the compressor to reach the critical discharge temperature T § Then, according to the stated upsampling rate Upclocking.

3. The control method according to claim 2, characterized in that, The up-frequency rate It can be obtained through the following formula: ； Where B is the second correction factor. α1 is the initial frequency ramp rate of the compressor; α2 is the second temperature ramp rate; and α3 is the rate at which the compressor reaches the critical discharge temperature T. § The third heating rate after that.

4. The control method according to claim 3, characterized in that, The initial up-frequency rate It can be obtained through the following formula: ； Wherein, △S1 is the initial exhaust temperature T0 reaching the final exhaust temperature T P The time required.

5. The control method according to claim 3, characterized in that, The third heating rate α3 is obtained by the following formula: ； Where C is the third correction factor.

6. The control method according to claim 2, characterized in that, According to the frequency upsampling rate After frequency increase, the critical exhaust temperature T is used as the basis for... § Controlling the operating frequency of the compressor further includes: According to the critical exhaust temperature T § and the upsampling rate Determine the frequency reduction rate of the compressor. ; Control the compressor to reach the reduced-frequency exhaust temperature T 降 Then, according to the stated frequency reduction rate Reduce frequency.

7. The control method according to claim 6, characterized in that, The frequency reduction rate It can be obtained through the following formula: ； Where D is the fourth correction factor.

8. A control device for a compressor, characterized in that, include: Acquisition module (110), the acquisition module (110) is used to acquire the frequency-limited discharge temperature T of the compressor. 限 and the initial target frequency P0; The detection module (120) is used to detect the initial exhaust temperature T0 of the compressor and the exhaust temperature T0 at which the initial target frequency P0 is reached. P ; Calculation module (130), the calculation module (130) is used to calculate the frequency-limited exhaust temperature T. 限 The first heating rate α1 of the compressor from the initial exhaust temperature T0 to the frequency-limited exhaust temperature T, and the compressor's rate of increase from the initial exhaust temperature T0 to the reached exhaust temperature T. P The second heating rate α2 is used to determine the critical discharge temperature T of the compressor. § The first heating rate α1 is obtained by the following formula: Wherein, △S represents the initial exhaust temperature T0 reaching the frequency-limited exhaust temperature T. 限 The time taken; the second heating rate α2 is obtained by the following formula: Wherein, △S1 is the distance from the initial exhaust temperature T0 to the reached exhaust temperature T. P The required time; the critical exhaust temperature T § It can be obtained through the following formula: Where A is the first correction factor; Control module (140), the control module (140) is used to determine the critical exhaust temperature T based on the critical exhaust temperature T. § Control the operating frequency of the compressor.

9. A compressor, characterized in that, It is capable of performing the control method as described in any one of claims 1-7.

10. A readable storage medium, characterized in that, The readable storage medium includes: a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the control method as described in any one of claims 1 to 7.

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