Control method and device for heating high pressure protection of air conditioner

Abstract

The application discloses a control method and device for heating high-pressure protection of an air conditioner. The method comprises the following steps: presetting an exhaust parameter preset value; obtaining an exhaust temperature and an exhaust parameter change amount related to the exhaust temperature of the air conditioner in a heating mode; comparing whether the exhaust parameter change amount is not less than the exhaust parameter preset value; if yes, controlling the air conditioner to enter high-pressure protection and recording a high-pressure exhaust temperature when the air conditioner enters the high-pressure protection; counting a time length required for the exhaust temperature to rise to the high-pressure exhaust temperature; judging whether the air conditioner satisfies a high-pressure protection exit condition, and if yes, exiting the high-pressure protection; counting a number of times that the air conditioner enters the high-pressure protection, calculating a weighted average value of the exhaust parameter change amount, and updating the exhaust parameter preset value according to the weighted average value in the data processing step. In the case that a pressure sensor is not used to collect pressure, whether the air conditioner enters the high-pressure protection can be accurately judged, and the operation stability of the air conditioner is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, specifically a kind of control method and device for the heating high pressure protection of air conditioner. BACKGROUND

[0002] When air conditioner is in heating operation, due to the factors such as dirty blockage of indoor coil or excessive ESP (Exhaust Static Pressure), the indoor air supply volume is small, which leads to the situation that the pressure of indoor coil is too high. The compressor of air conditioner is prone to wear and tear when it is running under high pressure for a long time. Moreover, once the heating high pressure protection occurs, it is likely to be repeated in a short time, which easily triggers high pressure protection frequently, and affects the stability and service life of air conditioning system.

[0003] Most of the prior art determines whether the air conditioner enters high pressure protection during heating operation by preset threshold of indoor coil temperature or pressure sensor added on the exhaust pipe of outdoor unit compressor. However, the cost of pressure sensor is high, and there is a short board in using indoor coil temperature sensor: for the air conditioner without communication between indoor unit and outdoor unit, the outdoor unit cannot receive the indoor coil temperature transmitted by the indoor unit, so it cannot achieve the purpose of high pressure protection. SUMMARY

[0004] In view of the above problems, the present application provides a control method and device for the heating high pressure protection of air conditioner, which can accurately determine whether the air conditioner enters high pressure protection without using pressure sensor to collect pressure, improve the operation stability of air conditioner, and save the manufacturing cost of air conditioner.

[0005] The present application provides a control method for the heating high pressure protection of air conditioner, which comprises the following steps:

[0006] Pre-setting step: presetting exhaust parameter preset value;

[0007] Obtaining step: obtaining the exhaust temperature of air conditioner running in heating mode and the change amount of exhaust parameter related to exhaust temperature;

[0008] Comparing step: comparing whether the change amount of exhaust parameter is not less than exhaust parameter preset value;

[0009] Control step: if the change amount of exhaust parameter is not less than exhaust parameter preset value, controlling air conditioner to enter high pressure protection and recording the high pressure exhaust temperature when air conditioner enters high pressure protection;

[0010] Timing step: counting the time length required for the rise of exhaust temperature to high pressure exhaust temperature;

[0011] High pressure protection exit step: judging whether air conditioner meets high pressure protection exit condition, and if yes, exiting high pressure protection;

[0012] The data processing step is to count the number of times of entering the high-pressure protection of the air conditioner, and to calculate the weighted average value of the exhaust parameter variation according to the number of times, the exhaust parameter variation, and the time length corresponding to the exhaust parameter variation;

[0013] The updating step is to update the exhaust parameter preset value according to the weighted average value in the data processing step.

[0014] According to the technical scheme, the parameter or preset value related to the exhaust temperature is used as the condition for entering the high-pressure protection, the use of the pressure sensor is avoided, the cost is saved, and the characteristics of the high-pressure protection during heating are used, and the multiple weighted average values have the characteristics of representing the trend change. After multiple high-pressure protections, the exhaust parameter preset value is updated by using the weighted average value of the exhaust parameter variation in the actual operation process, that is, the exhaust parameter preset value is calibrated by using the weighted average value of the exhaust parameter variation in the actual operation process, the accuracy of entering the high-pressure protection is improved, the air conditioner can enter the high-pressure protection in time under different working conditions, and the stability of the air conditioner during heating operation is improved.

[0015] In the preferred embodiment of the present application, the exhaust parameter variation is the difference between the maximum exhaust temperature and the indoor coil condensation saturation temperature, and the exhaust parameter preset value is the superheat preset value.

[0016] According to the technical scheme, the gas discharged by the compressor is superheated gas, which becomes saturated / subcooled liquid after condensation in the indoor coil. Therefore, the exhaust temperature is equal to the sum of the condensation saturation temperature of the refrigerant and the superheat. However, if the heat exchange of the condensation coil is poor, the refrigerant cannot be condensed into saturated / subcooled liquid, and the temperature of the refrigerant is higher than the saturation temperature of the refrigerant. The part higher than the saturation temperature of the refrigerant is the superheat. Therefore, the increase of the superheat leads to the increase of the exhaust temperature. By comparing the difference between the maximum exhaust temperature and the indoor coil condensation saturation temperature (i.e. the maximum superheat) with the superheat preset value to determine whether to enter the high-pressure protection, the air conditioner can enter the high-pressure protection in time, and the stability of the air conditioner during operation can be improved.

[0017] In the preferred embodiment of the present application, in the control step, if the difference between the maximum exhaust temperature and the indoor coil condensation saturation temperature is not less than the superheat preset value, the air conditioner is controlled to enter the high-pressure protection.

[0018] According to the technical scheme, the condition for entering the high-pressure protection is that the difference between the maximum exhaust temperature and the indoor coil condensation saturation temperature is not less than the superheat preset value, which can avoid frequent entering of the high-pressure protection, improve the stability of the air conditioner during operation, and prolong the service life of the air conditioner.

[0019] In the preferred embodiment of the present application, in the timing step, the time length for the exhaust temperature to rise from the indoor coil saturation temperature to the high-pressure exhaust temperature is counted.

[0020] According to the technical scheme, the weighted average of the superheat degree can be calculated by counting the time length for the exhaust temperature to rise from the indoor coil saturation temperature to the high-pressure exhaust temperature and combining the exhaust parameter variation amount (variation amount of the exhaust temperature) in the time length, the preset value of the superheat degree is updated according to the calculated weighted average of the superheat degree, the calibration of the preset value of the superheat degree is realized, the purpose that the air conditioner can enter / exit the high-pressure protection in time under different working conditions is achieved, and the stability of the heating operation of the air conditioner is improved.

[0021] In the optional technical scheme of the present application, the exhaust parameter variation amount is the exhaust temperature variation rate when the exhaust temperature is not less than the first protection threshold, and the exhaust parameter preset value is the variation rate preset value.

[0022] According to the technical scheme, when the exhaust temperature is greater than or equal to the first protection threshold, the exhaust temperature variation rate is counted, and whether to enter the high-pressure protection is judged by comparing the exhaust temperature variation rate with the variation rate preset value, which can avoid frequent triggering of the high-pressure protection, improve the stability of the air conditioner operation and the service life of the air conditioner, and when the exhaust temperature rises, the exhaust temperature variation rate in a short time will also rise, so the exhaust temperature variation rate or the superheat degree can be selected as the judgment index for entering the high-pressure protection according to the needs.

[0023] In the optional technical scheme of the present application, the preset step further includes presetting the variation rate preset value.

[0024] In the comparison step, whether the exhaust temperature variation rate is not less than the variation rate preset value is further compared.

[0025] In the control step, if the exhaust temperature is not less than the first protection threshold and the exhaust temperature variation rate is not less than the variation rate preset value, the air conditioner is controlled to enter the high-pressure protection.

[0026] According to the technical scheme, whether to enter the high-pressure protection is judged by comparing the exhaust temperature variation rate with the variation rate preset value, which can avoid frequent triggering of the high-pressure protection, improve the stability of the air conditioner operation and the service life of the air conditioner.

[0027] In the optional technical scheme of the present application, in the timing step, the time length for the exhaust temperature to rise from the first protection threshold to the high-pressure exhaust temperature is counted.

[0028] According to the technical scheme, the weighted average of the exhaust temperature variation rate can be calculated by counting the time length for the exhaust temperature to rise from the first protection threshold to the high-pressure exhaust temperature and combining the exhaust parameter variation amount (exhaust temperature variation rate) in the time length, the variation rate preset value is updated according to the calculated weighted average of the exhaust temperature variation rate, the calibration of the variation rate preset value is realized, the purpose that the air conditioner can enter / exit the high-pressure protection in time under different working conditions is achieved, and the stability of the heating operation of the air conditioner is improved.

[0029] In the optional technical solution of the present application, the obtaining step further comprises: obtaining the outdoor coil temperature and the outdoor environment temperature.

[0030] In the comparison step, further comprising: comparing whether the exhaust temperature is not greater than the second protection threshold value.

[0031] In the high-pressure protection exit step, the high-pressure protection exit condition comprises: if the exhaust temperature is not greater than the second protection threshold value, and the absolute value of the difference between the outdoor coil temperature and the outdoor environment temperature is not greater than the preset temperature difference.

[0032] According to the technical solution, the air conditioner is normally heating, the outdoor coil is on the low-pressure side, the outdoor coil temperature is lower than the outdoor environment temperature, when the indoor coil heat exchange is poor, the temperature of the refrigerant returning to the outdoor coil after throttling will also rise, and in severe cases, it will be higher than the outdoor environment temperature. Therefore, when the exhaust temperature is not greater than the second protection threshold value, and the absolute value of the difference between the outdoor coil temperature and the outdoor environment temperature is less than or equal to the preset temperature difference, it indicates that the heat exchange capacity of the indoor coil is acceptable, at this time, the high-pressure protection can be exited, the normal operation of the air conditioner is maintained, and the user experience is improved.

[0033] In the optional technical solution of the present application, in the high-pressure protection exit step, the high-pressure protection exit condition comprises: the exhaust temperature is not greater than the second protection threshold value, and the change rate of the outdoor coil temperature is not greater than the preset rate.

[0034] According to the technical solution, the air conditioner is normally heating, the outdoor coil is on the low-pressure side, the outdoor coil temperature is lower than the outdoor environment temperature, when the indoor coil heat exchange is poor, the temperature of the refrigerant returning to the outdoor coil after throttling will also rise, and in severe cases, it will be higher than the outdoor environment temperature. Therefore, when the exhaust temperature is not greater than the second protection threshold value, and the absolute value of the difference between the outdoor coil temperature and the outdoor environment temperature is less than or equal to the preset temperature difference, it indicates that the heat exchange capacity of the indoor coil is acceptable, at this time, the high-pressure protection can be exited, the normal operation of the air conditioner is maintained, and the user experience is improved.

[0035] The present application further provides a control device for heating high-pressure protection of an air conditioner, comprising: a preset module, presetting an exhaust parameter preset value;

[0036] An obtaining module, obtaining the exhaust temperature and the change amount of the exhaust parameter related to the exhaust temperature of the air conditioner running in the heating mode;

[0037] A comparison module, comparing whether the change amount of the exhaust parameter is not less than the exhaust parameter preset value;

[0038] A control module, if the change amount of the exhaust parameter is not less than the exhaust parameter preset value, controlling the air conditioner to enter high-pressure protection and recording the high-pressure exhaust temperature when the air conditioner enters high-pressure protection;

[0039] Timing module, counting the time length required for the exhaust temperature to rise to the high-pressure exhaust temperature;

[0040] High-pressure protection exit module, judging whether the air conditioner meets the high-pressure protection exit condition, and exiting the high-pressure protection if the condition is met;

[0041] Data processing module, recording the number of times the air conditioner enters the high-pressure protection within a specified time period, and calculating the weighted average value of the exhaust parameter variation according to the number of times the air conditioner enters the high-pressure protection, the exhaust parameter variation, and the time length corresponding to the exhaust parameter variation;

[0042] Updating module, updating the exhaust parameter preset value according to the weighted average value in the data processing module. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 The figure is a flowchart of the control method of the heating high-pressure protection of the air conditioner in the embodiment of the present application.

[0044] Figure 2 The figure is a flowchart of the operation of the control method of the heating high-pressure protection of the air conditioner in the embodiment of the present application.

[0045] Figure 3 The figure is a structural diagram of the control device of the heating high-pressure protection of the air conditioner in the embodiment of the present application.

[0046] Figure 4 The figure is a structural diagram of the air conditioner in the embodiment of the present application.

[0047] Reference signs:

[0048] Control device 1; preset module 11; acquisition module 12; comparison module 13; control module 14; timing module 15; high-pressure protection exit module 16; data processing module 17; updating module 18; compressor 2; four-way valve 3; indoor coil 4; throttling device 5; outdoor coil 6; gas-liquid separator 7. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0050] As shown in the figure, the present application provides a control method of the heating high-pressure protection of an air conditioner, which comprises the following steps: Figure 1 Preset step: presetting an exhaust parameter preset value;

[0051] Preset step: presetting an exhaust parameter preset value;

[0052] an acquisition step of acquiring an exhaust temperature of the air conditioner in a heating mode and a variation of an exhaust parameter related to the exhaust temperature;

[0053] a comparison step of comparing whether the variation of the exhaust parameter is not less than a preset value of the exhaust parameter;

[0054] a control step of controlling the air conditioner to enter a high-pressure protection and recording a high-pressure exhaust temperature when the air conditioner enters the high-pressure protection, if the variation of the exhaust parameter is not less than the preset value of the exhaust parameter;

[0055] a timing step of counting a time length required for the exhaust temperature to rise to the high-pressure exhaust temperature;

[0056] a high-pressure protection exit step of judging whether the air conditioner satisfies a high-pressure protection exit condition, and exiting the high-pressure protection if the air conditioner satisfies the high-pressure protection exit condition;

[0057] a data processing step of counting a number of times that the air conditioner enters the high-pressure protection, and calculating a weighted average value of the variation of the exhaust parameter according to the number of times, the variation of the exhaust parameter and a time length corresponding to the variation of the exhaust parameter;

[0058] an updating step of updating the preset value of the exhaust parameter according to the weighted average value in the data processing step.

[0059] By the above manner, the parameter or the preset value related to the exhaust temperature is used as a condition for judging entering the high-pressure protection, so that the use of the pressure sensor is omitted, which is beneficial to saving cost, and the high-pressure protection in heating has the reproducibility, and the multiple weighted average values have the characteristics of representing the trend change, so that the preset value of the exhaust parameter is updated by the weighted average value of the variation of the exhaust parameter after multiple high-pressure protections, that is, the preset value of the exhaust parameter is calibrated by the weighted average value of the variation of the exhaust parameter in the actual operation process, the accuracy of the high-pressure protection is improved, the air conditioner can timely enter the high-pressure protection under different working conditions, and the stability of the air conditioner in the heating operation is improved.

[0060] In the preferred embodiment of the present application, the variation of the exhaust parameter is a difference between a maximum exhaust temperature and a condensation saturation temperature of an indoor coil, and the preset value of the exhaust parameter is a preset value of superheat.

[0061] The gas discharged by the compressor is superheated gas, which becomes saturated / subcooled liquid after being condensed by the indoor coil, so the exhaust gas temperature is equal to the sum of the refrigerant condensation saturation temperature and the superheat degree, but if the condensation coil heat exchange is poor, the refrigerant cannot be condensed into saturated / subcooled liquid, and the refrigerant temperature is higher than the refrigerant saturation temperature, and the part of the refrigerant saturation temperature is the superheat degree, so the increase of the superheat degree leads to the increase of the exhaust gas temperature, and by comparing the difference between the maximum exhaust gas temperature and the indoor coil condensation saturation temperature (i.e. the maximum superheat degree) with the superheat degree preset value, it can be judged whether to enter the high pressure protection, which can ensure that the air conditioner enters the high pressure protection in time, and can avoid frequent triggering of the high pressure protection, and improve the stability of the air conditioner operation.

[0062] In the preferred embodiment of the application, in the control step, if the difference between the maximum exhaust gas temperature and the indoor coil condensation saturation temperature is not less than the superheat degree preset value, the air conditioner is controlled to enter the high pressure protection.

[0063] By the above-mentioned manner, taking the difference between the maximum exhaust gas temperature and the indoor coil condensation saturation temperature as the condition for entering the high pressure protection, the air conditioner can avoid frequent entry into the high pressure protection, and the stability of the air conditioner operation and the service life of the air conditioner can be improved.

[0064] In the preferred embodiment of the application, in the timing step, the time length for the exhaust gas temperature to rise from the indoor coil saturation temperature to the high pressure exhaust gas temperature is counted.

[0065] By the above-mentioned manner, by counting the time length for the exhaust gas temperature to rise from the indoor coil saturation temperature to the high pressure exhaust gas temperature, and combining the exhaust gas parameter change amount (the change amount of the exhaust gas temperature) in the time length, the weighted average value of the superheat degree can be calculated, the superheat degree preset value is updated according to the calculated weighted average value of the superheat degree, the calibration of the superheat degree preset value is realized, and the purpose that the air conditioner can enter / exit the high pressure protection in time under different working condition loads is achieved, and the stability of the air conditioner heating operation is improved.

[0066] In the preferred embodiment of the application, the exhaust gas parameter change amount is the exhaust gas temperature change rate when the exhaust gas temperature is not less than the first protection threshold, and the exhaust gas parameter preset value is the change rate preset value.

[0067] By the above-mentioned manner, when the exhaust gas temperature is greater than or equal to the first protection threshold, the exhaust gas temperature change rate is counted, and whether to enter the high pressure protection is judged by comparing the exhaust gas temperature change rate with the change rate preset value, which can ensure that the air conditioner enters the high pressure protection in time, and can avoid frequent triggering of the high pressure protection, and the stability of the air conditioner operation and the service life of the air conditioner can be improved, and when the exhaust gas temperature rises, the exhaust gas temperature change rate in a short time will also rise, so the superheat degree or the exhaust gas temperature change rate can be selected as the judgment index for entering the high pressure protection according to the needs.

[0068] In the preset step, the preset step further comprises presetting a preset variation rate value.

[0069] In the comparison step, the comparison step further comprises comparing whether the variation rate of the exhaust temperature is not less than the preset variation rate value.

[0070] In the control step, if the exhaust temperature is not less than the first protection threshold value and the variation rate of the exhaust temperature is not less than the preset variation rate value, the air conditioner is controlled to enter the high-pressure protection.

[0071] In the above manner, the high-pressure protection is determined by comparing the variation rate of the exhaust temperature with the preset variation rate value, so that the high-pressure protection is avoided from being frequently triggered, and the stability of the air conditioner in operation and the service life of the air conditioner are improved.

[0072] In the timing step, the time length for the exhaust temperature to rise from the first protection threshold value to the high-pressure exhaust temperature is counted.

[0073] In the above manner, the weighted average value of the variation rate of the exhaust temperature is calculated by counting the time length for the exhaust temperature to rise from the first protection threshold value to the high-pressure exhaust temperature and combining the exhaust parameter variation amount (the variation rate of the exhaust temperature) in the time length, the preset variation rate value is updated according to the calculated weighted average value of the variation rate of the exhaust temperature, the preset variation rate value is calibrated, the air conditioner can timely enter / exit the high-pressure protection under different working conditions, and the stability of the air conditioner in heating operation is improved.

[0074] In the obtaining step, the obtaining step further comprises: obtaining an outdoor coil temperature and an outdoor environment temperature.

[0075] In the comparison step, the comparison step further comprises: comparing whether the exhaust temperature is not greater than a second protection threshold value.

[0076] In the high-pressure protection exit step, the high-pressure protection exit condition comprises: if the exhaust temperature is not greater than the second protection threshold value and the absolute value of the difference between the outdoor coil temperature and the outdoor environment temperature is not greater than a preset temperature difference.

[0077] In the above manner, the air conditioner is normally operated in heating, the outdoor coil is on the low-pressure side, the outdoor coil temperature is lower than the outdoor environment temperature, when the indoor coil heat exchange is poor, the temperature of the refrigerant returned to the outdoor coil after throttling is also increased, and in a severe case, the temperature of the refrigerant returned to the outdoor coil is higher than the outdoor environment temperature, therefore, when the exhaust temperature is not greater than the second protection threshold value and the absolute value of the difference between the outdoor coil temperature and the outdoor environment temperature is less than or equal to the preset temperature difference, it is indicated that the heat exchange capacity of the indoor coil is acceptable, the high-pressure protection is exited at this time, the normal operation of the air conditioner is maintained, and the user experience is improved.

[0078] In the high-pressure protection exiting step of the preferred embodiment of the present application, the high-pressure protection exiting condition comprises: the exhaust temperature is not greater than the second protection threshold, and the change rate of the outdoor coil temperature is not greater than the preset rate.

[0079] In the above manner, the air conditioner is normally heated, the outdoor coil is at the low-pressure side, the outdoor coil temperature is lower than the outdoor environment temperature, when the indoor coil heat exchange is poor, the temperature of the refrigerant returned to the outdoor coil after throttling is also increased, and in a severe case, the temperature is higher than the outdoor environment temperature. Therefore, when the exhaust temperature is not greater than the second protection threshold, and the change amount of the outdoor coil temperature is less than or equal to the preset rate, it indicates that the heat exchange capacity of the indoor coil is acceptable, at this time, the high-pressure protection can be exited, the normal operation of the air conditioner is maintained, and the user experience is improved.

[0080] In the preferred embodiment of the present application, if the number of times of triggering the heating high-pressure protection of the air conditioner within a specified time period is greater than or equal to a specified threshold, a system maintenance fault code is reported, at this time, the air conditioner needs to be powered off and restarted to be normally operated again.

[0081] As shown in the following, the heating high-pressure protection process of the air conditioner in the embodiment of the present application is described in one specific operation example. Figure 2

[0082] The air conditioner is operated in the heating mode;

[0083] The preset superheat degree preset value T1 and the change rate preset value S are set;

[0084] The outdoor unit exhaust temperature T is detected p , the maximum exhaust temperature T pmax is iteratively recorded, the outdoor coil temperature T3, the outdoor environment temperature T4 and the indoor coil condensation saturation temperature T b are detected;

[0085] The maximum exhaust temperature T pmax is compared with the sum of the preset superheat degree T1 and the indoor coil condensation saturation temperature T b , or the exhaust temperature T p is compared with the first preset protection threshold Ts, the exhaust temperature change rate ΔT p / Δt and the change rate preset value S, or the outdoor coil temperature T3 is compared with the outdoor environment temperature T4;

[0086] If T pmax ≥T1+T b , or T p ≥T s , ΔT p / Δt≥S, or T3≥T4, the high-pressure protection is entered;

[0087] ​Further, record the high pressure exhaust temperature T p-n when high pressure protection is entered p ; record the exhaust temperature T p from T b up to T p-n , and the time taken is recorded as t bn ; record the exhaust temperature T p when T s ≥ T p , and the exhaust temperature change rate ΔT n / Δt is recorded as S p (n = 0, 1, 2, 3,...); record the exhaust temperature T s from T p-n up to T sn , and the time taken is recorded as t p ;

[0088] continuously detect the relationship between the exhaust temperature T p and the second preset protection threshold T2;

[0089] on the premise that T b ≤ T2, if |T3-T4|≤ preset temperature difference M or the outdoor coil temperature T3 change rate ΔT3 / Δt'≤ preset rate K1, i.e. exit high pressure protection;

[0090] Further, record the number of times n of high pressure protection of the air conditioner (specifically, each time high pressure protection is entered and exited, n is assigned a value, n = n + 1);

[0091] calculate the weighted average of the exhaust temperature change rate S and the superheat T1 of the air conditioner when high pressure protection is entered:

[0092] At this point, a protection cycle (referring to a cycle from entering high pressure protection to exiting high pressure protection) is completed;

[0093] let after each protection cycle is completed, the weighted average values and are respectively assigned to the change rate preset value S and the preset superheat T1, i.e. the superheat preset value T1 or the change rate preset value S can be calibrated.

[0094] In the preferred embodiment of the present application, the superheat preset value T1 = 25℃, the indoor coil condensation saturation temperature T b = 65℃, the first protection threshold T s = 80℃; the change rate preset value S = 5, the second protection threshold T2 = 60℃; the preset temperature difference M = 2℃, and the rate preset value K1 = 0.2. Through the setting of the above parameters, the air conditioner can be timely entered / exited high pressure protection, and the stability of the air conditioner operation is ensured.

[0095] As Figure 3 shown, the application further provides a control device 1 for heating high-pressure protection of an air conditioner, comprising:

[0096] a preset module 11 for presetting an exhaust parameter preset value;

[0097] an acquisition module 12 for acquiring an exhaust temperature and a change amount of an exhaust parameter related to the exhaust temperature of the air conditioner in a heating mode;

[0098] a comparison module 13 for comparing whether the change amount of the exhaust parameter is not less than the exhaust parameter preset value;

[0099] a control module 14 for controlling the air conditioner to enter high-pressure protection and recording a high-pressure exhaust temperature when the air conditioner enters high-pressure protection if the change amount of the exhaust parameter is not less than the exhaust parameter preset value;

[0100] a timing module 15 for counting a time length required for the exhaust temperature to rise to the high-pressure exhaust temperature;

[0101] a high-pressure protection exit module 16 for judging whether the air conditioner satisfies a high-pressure protection exit condition, and exiting the high-pressure protection if the air conditioner satisfies the high-pressure protection exit condition;

[0102] a data processing module 17 for recording a number of times of entering high-pressure protection of the air conditioner in a specified time period, and calculating a weighted average value of the change amount of the exhaust parameter according to the number of times of entering high-pressure protection of the air conditioner, the change amount of the exhaust parameter and a time length corresponding to the change amount of the exhaust parameter;

[0103] an updating module 18 for updating the exhaust parameter preset value according to the weighted average value in the data processing module 17.

[0104] It should be noted that when calculating the outdoor coil temperature change rate, the timing module 15 is further used for counting a time length Δt' corresponding to the outdoor coil temperature, and when calculating the exhaust temperature change rate, the timing module 15 is further used for counting a time length Δt corresponding to the change amount of the exhaust temperature greater than the first protection threshold. The counting of time by the timing module 15 can be performed according to the existing method, and will not be described here.

[0105] The acquisition module 12 comprises temperature sensors for detecting the exhaust temperature, an outdoor environment temperature, an indoor coil temperature and an outdoor coil temperature; the acquisition module 12 further comprises a module capable of data processing, such as calculating the superheat degree according to the exhaust temperature, calculating the exhaust temperature change rate according to the exhaust temperature, etc.

[0106] The preset module 11, the comparison module 13, the high-pressure protection exit module 16, the data processing module 17 and the update module 18 can be integrated in the control module 14 at least in part, and the control module 14 can be a controller of the air conditioner. In this way, the integration degree of the air conditioner can be improved, and the occupied space of the control device 1 can be reduced.

[0107] As shown in Figure 4 The application further provides an air conditioner with the above-mentioned control device for heating high-pressure protection, which comprises a compressor 2, a four-way valve 3, an indoor coil 4, a throttling device 5, an outdoor coil 6 and a gas-liquid separator 7 which are sequentially connected to form a refrigerant circulation loop. An exhaust sensor is arranged at an exhaust outlet of the compressor 2, an outdoor ambient temperature sensor is arranged at the outdoor coil 6 to detect the outdoor ambient temperature, and an outdoor coil temperature sensor is arranged at an inlet pipeline of the outdoor coil 6 to detect the outdoor coil temperature. The condensation saturation temperature of the refrigerant is related to the pressure, and the condensation saturation temperature of the refrigerant is constant at a given pressure. For the air conditioner without communication between the indoor unit and the outdoor unit, even if the outdoor unit cannot receive the indoor coil temperature transmitted by the indoor unit, the purpose of high-pressure protection can also be achieved.

[0108] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method for high-pressure protection during heating in an air conditioner, characterized in that, Includes the following steps: Preset steps: Preset exhaust parameter preset values; Acquisition Steps: Acquire the exhaust temperature of the air conditioner when it is running in heating mode and the change in exhaust parameters related to the exhaust temperature. The change in exhaust parameters is the difference between the maximum exhaust temperature and the indoor coil condensation saturation temperature, or the rate of change of exhaust temperature when the exhaust temperature is not less than the first protection threshold. Comparison step: Compare whether the change in the exhaust parameters is not less than the preset value of the exhaust parameters; Control steps: If the change in the exhaust parameters is not less than the preset value of the exhaust parameters, control the air conditioner to enter high-pressure protection and record the high-pressure exhaust temperature when the air conditioner enters high-pressure protection; Timing step: Count the time required for the exhaust temperature to rise to the high-pressure exhaust temperature; High-voltage protection deactivation procedure: Determine whether the air conditioner meets the high-voltage protection deactivation conditions. If it does, deactivate the high-voltage protection. Data processing steps: Count the number of times the air conditioner enters high-pressure protection, and calculate the weighted average of the changes in exhaust parameters based on the number of times, the changes in exhaust parameters, and the duration corresponding to the changes in exhaust parameters; Update step: Update the preset value of the exhaust parameters according to the weighted average value in the data processing step. in, When the change in the exhaust parameters is the difference between the maximum exhaust temperature and the indoor coil condensation saturation temperature, the preset value of the exhaust parameters is the superheat preset value. When the change in the exhaust parameters is the rate of change of the exhaust temperature that is not less than the first protection threshold, the preset value of the exhaust parameters is the preset value of the rate of change.

2. The control method for high-pressure protection of an air conditioner during heating according to claim 1, characterized in that, In the control steps, if the difference between the maximum exhaust temperature and the indoor coil condensation saturation temperature is not less than the superheat preset value, the air conditioner is controlled to enter high-pressure protection.

3. The control method for high-pressure protection of an air conditioner during heating according to claim 1, characterized in that, In the timing step, the time taken for the exhaust temperature to rise from the indoor coil saturation temperature to the high-pressure exhaust temperature is counted.

4. The control method for high-pressure protection of heating in an air conditioner according to claim 1, characterized in that, The preset steps also include a preset change rate preset value; The comparison step also includes comparing whether the rate of change of exhaust temperature is not less than the preset value of the rate of change; In the control steps, if the exhaust temperature is not less than the first protection threshold and the exhaust temperature change rate is not less than the preset change rate value, the air conditioner is controlled to enter high-pressure protection.

5. The control method for high-pressure protection of an air conditioner during heating according to claim 1, characterized in that, In the timing step, the time taken for the exhaust temperature to rise from the first protection threshold to the high-pressure exhaust temperature is counted.

6. The control method for high-pressure protection of an air conditioner in heating mode according to any one of claims 1 to 5, characterized in that, The acquisition step also includes: acquiring the outdoor coil temperature and the outdoor ambient temperature; The comparison step also includes: comparing whether the exhaust temperature is not greater than the second protection threshold. In the high-pressure protection exit step, the high-pressure protection exit conditions include: if the exhaust temperature is not greater than the second protection threshold, and the absolute value of the difference between the outdoor coil temperature and the outdoor ambient temperature is not greater than a preset temperature difference.

7. The control method for high-pressure protection of an air conditioner during heating according to claim 6, characterized in that, In the high-voltage protection deactivation step, the high-voltage protection deactivation conditions include: the exhaust temperature is not greater than the second protection threshold, and the rate of change of the outdoor coil temperature is not greater than a preset rate.

8. A control device for high-pressure protection during heating in an air conditioner, characterized in that, include: Preset module, preset exhaust parameter preset values; The acquisition module acquires the exhaust temperature of the air conditioner when it is running in heating mode and the change in exhaust parameters related to the exhaust temperature. The change in exhaust parameters is the difference between the maximum exhaust temperature and the indoor coil condensation saturation temperature, or the rate of change of exhaust temperature when the exhaust temperature is not less than a first protection threshold. The comparison module compares whether the change in the exhaust parameters is not less than the preset value of the exhaust parameters; If the change in the exhaust parameters is not less than the preset value of the exhaust parameters, the control module controls the air conditioner to enter high-pressure protection and records the high-pressure exhaust temperature when the air conditioner enters high-pressure protection. The timing module counts the time required for the exhaust temperature to rise to the high-pressure exhaust temperature; The high-voltage protection exit module determines whether the air conditioner meets the high-voltage protection exit conditions. If it does, the high-voltage protection is exited. The data processing module records the number of times the air conditioner enters high-pressure protection within a specified time period, and calculates the weighted average of the changes in exhaust parameters based on the number of times the air conditioner enters high-pressure protection, the amount of change in exhaust parameters, and the duration corresponding to the changes in exhaust parameters. The update module updates the preset value of the exhaust parameters based on the weighted average value in the data processing module. in, When the change in the exhaust parameters is the difference between the maximum exhaust temperature and the indoor coil condensation saturation temperature, the preset value of the exhaust parameters is the superheat preset value. When the change in the exhaust parameters is the rate of change of the exhaust temperature that is not less than the first protection threshold, the preset value of the exhaust parameters is the preset value of the rate of change.

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