Heating control method for air conditioner

Abstract

The application discloses a heating control method of an air conditioner, which comprises the following steps: when the air conditioner is in a heating mode, monitoring the operation parameters of the air conditioner; when the temperature IPT of the indoor coil is greater than or equal to a set high-temperature threshold, controlling the outdoor fan to be turned off, and accumulating the stop running time of the outdoor fan; when the temperature IPT of the indoor coil is less than or equal to a first set temperature, controlling the outdoor fan to be turned on, and temporarily stopping the accumulation of the stop running time M of the outdoor fan; when the accumulated time M of the stop running of the outdoor fan is greater than or equal to a first set time, performing a defrosting operation, and resetting the accumulated time M of the stop running of the outdoor fan. According to the monitoring of the temperature of the indoor coil and the stop running time of the outdoor fan, the start state of the outdoor fan and the air conditioner is adjusted, high-temperature protection is realized, and whether defrosting is needed can be determined in time, so that the outdoor unit is prevented from being seriously iced due to the long-time stop of the outdoor fan.

Description

Technical Field

[0001] This invention relates to the field of air conditioner heating control technology, and more specifically to a heating control method for air conditioners. Background Technology

[0002] When an air conditioner is in heating mode, high-temperature, high-pressure refrigerant evaporates and dissipates heat indoors, heating the air and achieving the heating effect. When operating in heating mode at high ambient temperatures, the high indoor and outdoor temperatures lead to high pressure in the air conditioner, resulting in a high compressor temperature. To avoid affecting the compressor's lifespan, the conventional practice is to shut down the outdoor fan and compressor sequentially when the indoor heat exchanger's inner coil temperature reaches a set threshold for overheat protection. However, if heating continues, the outdoor unit's temperature drops sharply due to the outdoor fan's shutdown. With prolonged shutdown of the outdoor fan, severe icing may occur on the condenser, affecting the air conditioner's heating performance. Therefore, the purpose of this application is to provide a heating control method for an air conditioner to solve at least one of the above-mentioned problems. Summary of the Invention

[0003] Based on the above analysis, the present invention proposes a heating control method for an air conditioner to address the shortcomings of the prior art.

[0004] This invention is mainly achieved through the following technical solutions:

[0005] The present invention provides a heating control method for an air conditioner, comprising the following steps:

[0006] S1: When the air conditioner is in heating mode, monitor the operating parameters of the air conditioner, including the indoor coil temperature IPT and the cumulative time M during which the outdoor fan stops running;

[0007] S2: Determine whether the collected indoor coil temperature IPT is greater than or equal to the set high temperature threshold. If it is greater than or equal to, control the outdoor fan to shut down and accumulate the downtime of the outdoor fan, and then proceed to step S3; if it is less than, maintain the heating mode and continue to monitor the operating parameters.

[0008] S3: Determine whether the collected indoor coil temperature IPT is less than or equal to the first set temperature. If it is less than or equal to, control the outdoor fan to start, and pause the accumulation of the outdoor fan's stop running time M, and then proceed to step S4.

[0009] S4: When the cumulative time M of the outdoor fan stopping operation is greater than or equal to the first set time, perform defrosting operation and reset the cumulative time M of the outdoor fan stopping operation.

[0010] The high temperature threshold is greater than the first set temperature.

[0011] Furthermore, step S2 specifically includes the following operating conditions:

[0012] S2a: When the indoor coil temperature IPT is greater than or equal to the first set high temperature and less than the second set high temperature, control the outdoor fan to shut down, accumulate the downtime of the outdoor fan, and then proceed to step S3a.

[0013] S2b: When the collected indoor coil temperature IPT is greater than or equal to the second set high temperature, control the compressor to shut down, the indoor fan to run at the set first wind speed, control the outdoor fan to shut down, and accumulate the stop time of the outdoor fan, and then proceed to step S3b.

[0014] The steps in step S3 corresponding to running conditions S2a and S2b are as follows:

[0015] S3a: When the collected indoor coil temperature IPT is less than or equal to the first set temperature, control the outdoor fan to start, and pause the accumulation of the outdoor fan's stop time M.

[0016] S3b: When the collected indoor coil temperature IPT is less than or equal to the first set temperature, control the outdoor fan and compressor to start, the indoor fan to run at the set second wind speed, and the outdoor fan's stop time M is paused and accumulated.

[0017] By monitoring the temperature of the indoor coil in different zones, the compressor is not shut down unless necessary, which reduces the adverse effects of frequent start-stop cycles on compressor and system performance and safety, and improves the performance of the air conditioner.

[0018] Furthermore, the operating parameters in step S1 also include the compressor's operating time t1, and the specific monitoring of the air conditioner's operating parameters in step S1 is as follows:

[0019] S111: After the air conditioner has been running in heating mode for the second set time, monitor the operating parameters of the air conditioner;

[0020] S112: Collect the indoor coil temperature IPT, set the collected indoor coil temperature at this time as the maximum indoor coil temperature IPTm, and set the compressor running time t1 at this time as the time t corresponding to the maximum indoor coil temperature, i.e., t = t1.

[0021] After step S4 is completed, return to step S112.

[0022] Furthermore, before shutting down the outdoor fan in the operating condition step S2a, the following steps are also included:

[0023] S21: Collect the indoor coil temperature IPT and compare the currently collected indoor coil temperature IPT with the currently set maximum indoor coil temperature IPTm;

[0024] S22: When IPT is greater than or equal to IPTm, the temperature of the indoor coil currently collected is set to the new maximum temperature of the inner coil, and the running time t1 of the compressor corresponding to the current collection time is set to the time t corresponding to the new maximum temperature of the inner coil, i.e., t=t1. Otherwise, the values ​​of the maximum temperature of the inner coil IPTm and the time t corresponding to the maximum temperature of the inner coil remain unchanged.

[0025] Furthermore, step S3, corresponding to operating conditions S2a and S2b respectively, also includes the following steps:

[0026] S311: When the collected indoor coil temperature IPT is greater than the first set temperature, then return to step S21 to determine the magnitude of IPT and IPTm;

[0027] S321: When the collected indoor coil temperature IPT is greater than the first set temperature, compare the currently collected indoor coil temperature IPT with the currently set maximum indoor coil temperature IPTm.

[0028] S322: When IPT is greater than or equal to IPTm, set the currently collected indoor coil temperature to the new maximum indoor coil temperature, and set the compressor running time t1 corresponding to the current collection time to the time t corresponding to the new maximum indoor coil temperature, i.e., t=t1. Otherwise, keep the values ​​of the maximum indoor coil temperature IPTm and the time t corresponding to the maximum indoor coil temperature unchanged, and then return to step S2b to control the compressor to shut down, the indoor fan to run at the set first fan speed, and control the outdoor fan to shut down.

[0029] Furthermore, the operating parameters in step S1 also include the number of defrosts P within a set time period, the cumulative operating time N of the compressor, and the time difference Δt between the set maximum temperature of the inner disk and the time when the defrost temperature difference is met.

[0030] Furthermore, after step S2, which states "if the value is less than, maintain the heating mode and continue monitoring the operating parameters," the following steps are also included:

[0031] S5: When the collected indoor coil temperature IPT is lower than the first set high temperature, compare the currently collected indoor coil temperature IPT with the set maximum indoor coil temperature IPTm.

[0032] S6: When IPT is greater than or equal to IPTm, set the currently collected indoor coil temperature to the new maximum indoor coil temperature, and set the compressor running time t1 corresponding to the current collection time to the time t corresponding to the new maximum indoor coil temperature, i.e., t=t1. Otherwise, keep the values ​​of the maximum indoor coil temperature IPTm and the time t corresponding to the maximum indoor coil temperature unchanged.

[0033] S7: Calculate ΔIPT = IPTm - IPT. When ΔIPT is greater than or equal to the first set temperature difference, set the compressor running time t1 at this time to the time t2 when defrosting meets the defrosting temperature difference, that is, t2 = t1, and then proceed to step S8.

[0034] S8: Determine whether the collected indoor coil temperature IPT is less than or equal to the second set temperature. If it is less than or equal to the second set temperature, determine whether the collected compressor cumulative running time N is greater than or equal to the third set time. If IPT is greater than the second set temperature, return to step 5 to compare the size of IPT and IPTm.

[0035] S9: When N is greater than or equal to the third set time, determine whether the number of defrosts collected P is equal to 0; when N is less than the third set time, return to step 5 to compare the size of IPT and IPTm.

[0036] S10: When P=0, perform defrosting operation, set Δt to t2-t, reset the compressor's cumulative running time N, set the defrosting count P to 1, and then return to step S112; when P is not equal to 0, proceed to step S11.

[0037] S11: Calculate the actual value of the time difference between the maximum temperature of the inner plate and the time when the defrosting temperature difference is met, Δt´= t2-t. Compare the set Δt with Δt´, i.e. Δt-(t2-t), and perform the corresponding defrosting operation. Set Δt to t2-t, reset the cumulative running time N of the compressor, set the number of defrosting times P to 1, and then return to step S112.

[0038] Furthermore, the following steps are included after step S4:

[0039] S12: When the cumulative time M of the outdoor fan stops running is less than the first set time, proceed to step 5 to compare the size of IPT and IPTm.

[0040] Furthermore, the operating parameters in step S1 also include the wind speed of the indoor fan;

[0041] The following steps are included after step S7:

[0042] S13: When ΔIPT is less than the first set temperature difference, determine whether the cumulative running time N of the compressor is greater than or equal to the fourth set time and whether the indoor coil temperature IPT is less than or equal to the third set temperature. When N ≥ the fourth set time and IPT ≤ the third set temperature, perform defrosting operation, reset the cumulative running time N of the compressor, set the number of defrosting times P to 1, and then return to step S112; when neither condition is met, compare the collected indoor coil temperature with the second set temperature.

[0043] S14: When IPT > the second set temperature, determine whether the indoor fan is running at the set third wind speed; when IPT ≤ the second set temperature, return to step 5 to compare the size of IPT and IPTm.

[0044] S15: When the indoor fan is running at the third wind speed, calculate ΔIPT = IPTm - IPT. When ΔIPT is greater than or equal to the second set temperature difference, set the compressor running time t1 corresponding to the data collection to the time t2 when defrosting meets the defrosting temperature difference, i.e., t2 = t1, and determine whether the collected defrosting times P is equal to 0. When ΔIPT is less than the second set temperature difference, return to step 5 to compare the size of IPT and IPTm.

[0045] S16: When P=0, perform defrosting operation, set Δt to t2-t, reset the compressor's cumulative running time N, set the defrosting count P to 1, and then return to step S112; when P is not equal to 0, proceed to step S17.

[0046] S17: Calculate the actual value of the time difference between the maximum temperature of the inner plate and the time when the defrosting temperature difference is met, Δt´= t2-t. Compare the set Δt with Δt´, i.e. Δt-(t2-t), and perform the corresponding defrosting operation. Set Δt to t2-t, reset the cumulative running time N of the compressor, set the number of defrosting times P to 1, and then return to step S112.

[0047] Furthermore, step 7 is followed by the following steps:

[0048] S18: When ΔIPT is less than the first set temperature difference, determine whether the cumulative time N of the compressor operation is greater than or equal to the fifth set time. If N ≥ the fifth set time, determine whether the temperature of the indoor coil is greater than the second set temperature. If N is less than the fifth set time, return to step 5 to compare the size of IPT and IPTm.

[0049] S19: When IPT > the second set temperature, determine whether the indoor fan is running at the set third wind speed; when IPT ≤ the second set temperature, return to step 5 to compare the size of IPT and IPTm.

[0050] S20: When the indoor fan is running at the third wind speed, calculate ΔIPT = IPTm - IPT. When ΔIPT is greater than or equal to the second set temperature difference, set the compressor running time t1 corresponding to the data collection to the time t2 when defrosting meets the defrosting temperature difference, i.e., t2 = t1, and determine whether the collected defrosting times P is equal to 0. When ΔIPT is less than the second set temperature difference, return to step 5 to compare the size of IPT and IPTm.

[0051] S21: When P=0, perform defrosting operation, set Δt to t2-t, reset the compressor's cumulative running time N, set the defrosting count P to 1, and then return to step S112; when P is not equal to 0, proceed to step S22.

[0052] S22: Calculate the actual value of the time difference between the maximum temperature of the inner plate and the time when the defrosting temperature difference is met, Δt´= t2-t. Compare the set Δt with Δt´, i.e. Δt-(t2-t), and perform the corresponding defrosting operation. Set Δt to t2-t, reset the cumulative running time N of the compressor, set the number of defrosting times P to 1, and then return to step S112.

[0053] Furthermore, the defrosting operation in step S4 includes the following steps:

[0054] Turn off the compressor, delay for 30 seconds, close the four-way valve, turn off the outdoor and indoor fans, delay for 15 seconds, turn on the compressor, delay for another 8 minutes, turn on the outdoor fan, delay for 20 seconds to open the four-way valve, delay for 5 seconds, and then turn on the indoor fan.

[0055] Furthermore, the set Δt is compared with Δt´, i.e., Δt-(t2-t), and the corresponding defrosting operation is performed, specifically including the following operating conditions:

[0056] When Δt-(t2-t) is greater than or equal to the first time difference, shut down the compressor, delay for 30 seconds, close the four-way valve, shut down the outdoor and indoor fans, delay for 15 seconds, turn on the compressor, delay for another 10 minutes, turn on the outdoor fan, delay for 20 seconds to open the four-way valve, delay for 5 seconds, and then turn on the indoor fan.

[0057] When Δt-(t2-t) is less than or equal to the second time difference, shut down the compressor, delay for 30 seconds, close the four-way valve, shut down the outdoor and indoor fans, delay for 15 seconds, turn on the compressor, delay for another 7 minutes, turn on the outdoor fan, delay for 20 seconds to open the four-way valve, delay for 5 seconds, and then turn on the indoor fan.

[0058] When Δt-(t2-t) is greater than the second time difference and less than the first time difference, the compressor is turned off, the four-way valve is turned off after a 30-second delay, the outdoor and indoor fans are turned off, the compressor is turned on after a 15-second delay, the outdoor fan is turned on after an 8-minute delay, the four-way valve is turned on after a 20-second delay, and the indoor fan is turned on after a 5-second delay.

[0059] Furthermore, the operating parameters in step S1 also include the cumulative operating time N of the compressor and the number of defrost cycles P within the set time period;

[0060] It also includes the following steps:

[0061] S23: When the cumulative running time N of the compressor is greater than or equal to the fourth set time and the temperature of the indoor coil is less than or equal to the third set temperature, a defrosting operation is performed, the number of defrosts P is set to 1, and the cumulative running time N of the compressor is reset.

[0062] Compared with the prior art, the beneficial effects of the technical solution of the present invention are as follows:

[0063] This invention provides a heating control method for an air conditioner. By monitoring the temperature of the indoor coil, the operating status of air conditioner components such as the indoor fan and compressor can be adjusted in a timely manner to achieve high-temperature protection. By monitoring the shutdown time of the outdoor fan, it can promptly determine whether defrosting is needed, avoiding severe icing of the outdoor unit due to prolonged shutdown of the outdoor fan. This method better protects the air conditioner, prevents compressor damage, and improves the user experience. Attached Figure Description

[0064] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings 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.

[0065] Figure 1 This is a schematic flowchart of a heating control method for an air conditioner provided in an embodiment of the present invention;

[0066] Figure 2 This is a flowchart of step S1 provided in an embodiment of the present invention;

[0067] Figure 3 This is a flowchart of step S5 provided in an embodiment of the present invention;

[0068] Figure 4 This is a flowchart of steps S13 and S18 provided in the embodiments of the present invention;

[0069] Figure 5This is a schematic diagram of the principle of the air conditioner provided in the embodiment of the present invention.

[0070] The attached figures are labeled as follows:

[0071] 1. Compressor, 2. Indoor heat exchanger, 3. Outdoor heat exchanger, 4. Capillary tube, 5. Four-way valve, 6. High-pressure valve, 7. Low-pressure valve, 8. Indoor coil. Detailed Implementation

[0072] To enable those skilled in the art to better understand the present invention and to more clearly define the scope of protection of the present invention, the present invention will be described in detail below with reference to certain specific embodiments. It should be noted that the following are only some specific embodiments of the present invention, and are merely a part of the embodiments of the present invention. The specific and direct descriptions of related structures are only for the convenience of understanding the present invention, and the specific features do not necessarily or directly limit the scope of the present invention. Conventional choices and substitutions made by those skilled in the art under the guidance of the present invention should be considered within the scope of protection of the present invention.

[0073] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0074] Example 1

[0075] This invention provides a heating control method for air conditioners, applicable to... Figure 5 The air conditioner shown includes a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, a capillary tube 4, a four-way valve 5, a high-pressure valve 6, and a low-pressure valve 7. The exhaust pipe and return pipe of the compressor 1, the indoor unit 2, and the outdoor unit 3 are connected to the respective ports of the four-way valve 5. The indoor unit 2 and the outdoor unit 3 are connected in series via the high-pressure valve 6 and the capillary tube 4. A low-pressure valve 7 is installed between the corresponding ports of the indoor unit 2 and the four-way valve 5. The indoor heat exchanger 2 includes an indoor coil 8 and an indoor fan, and the outdoor heat exchanger 3 includes an outdoor fan. The air conditioner system also includes a controller, a memory, and a temperature sensor to adjust the operating status of the air conditioner based on the detected operating conditions and the temperature information obtained by the temperature sensor. The memory can also store set parameters, updated parameter information, collected temperature information, and other related information.

[0076] The heating control method for an air conditioner provided by this invention includes the following steps:

[0077] Before the air conditioner starts operating in heating mode, the following are also included:

[0078] S01: When the air conditioner starts, set the cumulative running time N of the compressor, the cumulative time M during which the outdoor fan stops running, and the number of defrost cycles P to 0 respectively.

[0079] S02: When the air conditioner detects a heating signal, it starts the compressor, four-way valve and outdoor fan, while the indoor fan does not start.

[0080] S03: Detect the indoor coil temperature (IPT). When the indoor coil temperature is greater than 37°C, turn on the indoor fan.

[0081] When the indoor coil temperature (IPT) is below 37°C, no heat is generated temporarily, and the air blown out by the indoor fan will be relatively cold, making people feel uncomfortable. Therefore, it is necessary to wait until the temperature reaches 37°C before turning on the indoor fan.

[0082] like Figure 1 As shown, S1: When the air conditioner is in heating mode, monitor the operating parameters of the air conditioner, including the indoor coil temperature IPT and the cumulative time M during which the outdoor fan stops running.

[0083] The operating parameters also include the compressor's operating time t1, the number of defrost cycles P within a set time period (the set time is manually set), the compressor's cumulative operating time N, the time difference Δt between the set maximum inner plate temperature and the time when the defrost temperature difference is met, and the indoor fan speed.

[0084] like Figure 2 As shown, preferably, the monitoring of the air conditioner's operating parameters specifically includes:

[0085] S111: After the air conditioner has been running in heating mode for the second set time, monitor the operating parameters of the air conditioner;

[0086] S112: Collect the indoor coil temperature IPT, set the collected indoor coil temperature at this time as the maximum indoor coil temperature IPTm, and set the compressor running time t1 at this time as the time t corresponding to the maximum indoor coil temperature, i.e., t = t1.

[0087] Specifically, the second time setting is 6 minutes. Only after 6 minutes can the temperature of the indoor coil be monitored to provide an accurate reference, ensuring the detection effect, reducing detection errors, and making the detection more efficient.

[0088] After the air conditioner has been running in heating mode for 6 minutes, it begins monitoring the indoor coil temperature IPT, the outdoor fan stop time M, the compressor running time t1, the compressor's cumulative running time N, the indoor fan speed, the number of defrost cycles P, and the time difference Δt between the set maximum indoor coil temperature and the time when the defrost temperature difference is met. The set value of the maximum indoor coil temperature changes with the heating operation time, making the maximum indoor coil temperature IPTm more reliable and ensuring more accurate subsequent judgment conditions.

[0089] S2: Determine whether the collected indoor coil temperature IPT is greater than or equal to the set high temperature threshold. If it is greater than or equal to, control the outdoor fan to shut down and accumulate the downtime of the outdoor fan, and then proceed to step S3; if it is less than, maintain the heating mode and continue to monitor the operating parameters.

[0090] S3: Determine whether the collected indoor coil temperature IPT is less than or equal to the first set temperature. If it is less than or equal to, control the outdoor fan to start, and pause the accumulation of the outdoor fan's stop running time M, and then proceed to step S4.

[0091] In this embodiment, the high temperature threshold is greater than the first set temperature, specifically the second set high temperature is greater than the first set high temperature, the first set high temperature is greater than the first set temperature, and the first set temperature is 48°C.

[0092] Specifically, the following operating conditions are included:

[0093] Condition 1S2a: When the collected indoor coil temperature IPT is greater than or equal to the first set high temperature and less than the second set high temperature, the outdoor fan is turned off, and the outdoor fan's downtime is accumulated, then proceed to step S3a. The steps in step S3 corresponding to operating condition S2a are as follows: S3a: When the collected indoor coil temperature IPT is less than or equal to the first set temperature, the outdoor fan is turned on, and the accumulation of the outdoor fan's downtime M is paused; otherwise, proceed to step S311. S311: When the collected indoor coil temperature IPT is greater than the first set temperature, return to step S21 to determine the magnitude of IPT and IPTm. The first set high temperature is 55℃, and the second set high temperature is 65℃.

[0094] In this embodiment, before controlling the outdoor fan to shut down, the following steps are also included: S21: Collect the temperature IPT of the indoor coil and compare the currently collected indoor coil temperature IPT with the currently set maximum inner coil temperature IPTm; S22: When IPT is greater than or equal to IPTm, set the currently collected indoor coil temperature to the new maximum inner coil temperature, and set the compressor running time t1 corresponding to the current collection time to the time t corresponding to the new maximum inner coil temperature, i.e., t = t1; otherwise, keep the values ​​of the maximum inner coil temperature IPTm and the time t corresponding to the maximum inner coil temperature unchanged.

[0095] Condition 2S2b: When the collected indoor coil temperature IPT is greater than or equal to the second set high temperature, control the compressor to shut down, the indoor fan to run at the set first wind speed, control the outdoor fan to shut down, and accumulate the outdoor fan's downtime, then proceed to step S3b. The steps in step S3 corresponding to operating condition S2b are as follows: S3b: When the collected indoor coil temperature IPT is less than or equal to the first set temperature, control the outdoor fan and compressor to turn on, the indoor fan to run at the set second wind speed, and pause the accumulation of the outdoor fan's downtime M; otherwise, proceed to step S321. S321: When the collected indoor coil temperature IPT is greater than the first set temperature, compare the currently collected indoor coil temperature IPT with the currently set maximum inner coil temperature IPTm; S322: When IPT is greater than or equal to IPTm, set the currently collected indoor coil temperature to the new maximum inner coil temperature, and set the compressor running time t1 corresponding to the current collection time to the time t corresponding to the new maximum inner coil temperature, i.e., t=t1; otherwise, keep the values ​​of the maximum inner coil temperature IPTm and the time t corresponding to the maximum inner coil temperature unchanged, and then return to step S2b to control the compressor to shut down, the indoor fan to run at the set first fan speed, and control the outdoor fan to shut down.

[0096] The first wind speed is the high speed. The second wind speed is the initial set wind speed, which is set according to the air conditioner's remote control. The wind speed when the indoor and outdoor fans start is determined by the control commands of the remote control.

[0097] In step S322, t1 and in step S22 both represent the compressor's running time when the indoor coil temperature is detected. However, this does not mean that t1 in step S32 is numerically equal to t1 in step S22, because the numerical values ​​of t in different steps are not the same due to the different running times of the compressor during actual data collection.

[0098] like Figure 3 As shown, specifically, if the value is less than, after maintaining the heating mode and continuing to monitor the operating parameters, the following operating conditions are also included:

[0099] Condition 3S5: When the collected indoor coil temperature IPT is less than the first set high temperature, compare the currently collected indoor coil temperature IPT with the set maximum indoor coil temperature IPTm.

[0100] S6: When IPT is greater than or equal to IPTm, set the currently collected indoor coil temperature to the new maximum indoor coil temperature, and set the compressor running time t1 corresponding to the current collection time to the time t corresponding to the new maximum indoor coil temperature, i.e., t=t1. Otherwise, keep the values ​​of the maximum indoor coil temperature IPTm and the time t corresponding to the maximum indoor coil temperature unchanged.

[0101] S7: Calculate ΔIPT = IPTm - IPT. When ΔIPT is greater than or equal to the first set temperature difference, set the compressor's running time t1 at this time to the time t2 when defrosting meets the defrosting temperature difference, i.e., t2 = t1, and then proceed to step S8; otherwise, proceed to step S13. The first set temperature difference is 7℃.

[0102] like Figure 4 As shown, the specific operating conditions include the following:

[0103] Condition 1S13: When ΔIPT is less than the first set temperature difference, determine whether the collected cumulative compressor running time N is greater than or equal to the fourth set time and whether the collected indoor coil temperature IPT is less than or equal to the third set temperature. If N ≥ the fourth set time and IPT ≤ the third set temperature, perform a defrost operation, reset the compressor's cumulative running time N, set the defrost count P to 1, and then return to step S112. If neither condition is met, compare the collected indoor coil temperature with the second set temperature. The fourth set time is greater than the third set time (120 min), and the third set temperature is less than the second set temperature (35℃).

[0104] In this embodiment, the defrosting operation includes turning off the compressor, delaying for 30 seconds, turning off the four-way valve, turning off the outdoor fan and the indoor fan, delaying for 15 seconds, turning on the compressor, delaying for another 8 minutes, turning on the outdoor fan, delaying for 20 seconds to open the four-way valve, delaying for 5 seconds, and then turning on the indoor fan.

[0105] S14: When IPT > the second set temperature, determine whether the indoor fan is running at the set third fan speed. When IPT ≤ the second set temperature, return to step 5 to compare the magnitudes of IPT and IPTm. The third fan speed is low speed.

[0106] S15: When the indoor fan is running at the third fan speed, calculate ΔIPT = IPTm - IPT. When ΔIPT is greater than or equal to the second set temperature difference, set the compressor running time t1 corresponding to the data collection to the time t2 when defrosting meets the defrosting temperature difference, i.e., t2 = t1, and determine whether the collected defrosting count P is equal to 0. When ΔIPT is less than the second set temperature difference, return to step 5 to compare the size of IPT and IPTm. The second set temperature difference is less than the first set temperature difference, and the second set temperature difference is 5℃.

[0107] S16: When P=0, perform defrosting operation, set Δt to t2-t, reset the compressor's cumulative running time N, set the number of defrosting times P to 1, and then return to step S112; when P is not equal to 0, proceed to step S17.

[0108] In this embodiment, the defrosting operation includes turning off the compressor, delaying for 30 seconds, turning off the four-way valve, turning off the outdoor fan and the indoor fan, delaying for 15 seconds, turning on the compressor, delaying for another 8 minutes, turning on the outdoor fan, delaying for 20 seconds to open the four-way valve, delaying for 5 seconds, and then turning on the indoor fan.

[0109] After defrosting, IPTm needs to be reset, based on the indoor coil temperature measured 6 minutes after heating restarts.

[0110] S17: Calculate the actual value of the time difference between the maximum temperature of the inner plate and the time when the defrosting temperature difference is met, Δt´= t2-t. Compare the set Δt with Δt´, i.e. Δt-(t2-t), and perform the corresponding defrosting operation. Set Δt to t2-t, reset the cumulative running time N of the compressor, set the number of defrosting times P to 1, and then return to step S112.

[0111] The t2 in step S15 and the t2 in step S7 only represent the time when the maximum temperature of the inner plate and the defrosting temperature meet different defrosting temperature differences under different operating conditions. They do not mean that the t2 in step S17 is numerically equal to the t2 in step S7, because the t values ​​in different steps are not the same due to the different running time t of the compressor during actual data collection.

[0112] Condition 2S18: When ΔIPT is less than the first set temperature difference, determine whether the cumulative compressor running time N is greater than or equal to the fifth set time. If N ≥ the fifth set time, determine whether the indoor coil temperature is greater than the second set temperature. If N is less than the fifth set time, return to step 5 to compare IPT with IPTm. The fifth set time is equal to the third set time, and the fifth set time is 50 minutes.

[0113] S19: When IPT > the second set temperature, determine whether the indoor fan is running at the set third fan speed. When IPT ≤ the second set temperature, return to step 5 to compare the magnitudes of IPT and IPTm. The third fan speed is low speed.

[0114] S20: When the indoor fan is running at the third fan speed, calculate ΔIPT = IPTm - IPT. When ΔIPT is greater than or equal to the second set temperature difference, set the compressor running time t1 corresponding to the data collection to the time t2 when defrosting meets the defrosting temperature difference, i.e., t2 = t1, and determine whether the collected defrosting count P is equal to 0. When ΔIPT is less than the second set temperature difference, return to step 5 to compare the size of IPT and IPTm. The second set temperature difference is 5℃.

[0115] In this embodiment, when the indoor fan is not running at the third wind speed, the process returns to step 5 to compare the magnitudes of IPT and IPTm.

[0116] S21: When P=0, perform defrosting operation, set Δt to t2-t, reset the compressor's cumulative running time N, set the defrosting count P to 1, and then return to step S112; when P is not equal to 0, proceed to step S22.

[0117] In this embodiment, the defrosting operation includes turning off the compressor, delaying for 30 seconds, turning off the four-way valve, turning off the outdoor fan and the indoor fan, delaying for 15 seconds, turning on the compressor, delaying for another 8 minutes, turning on the outdoor fan, delaying for 20 seconds to open the four-way valve, delaying for 5 seconds, and then turning on the indoor fan.

[0118] S22: Calculate the actual value of the time difference between the maximum temperature of the inner plate and the time when the defrosting temperature difference is met, Δt´= t2-t. Compare the set Δt with Δt´, i.e. Δt-(t2-t), and perform the corresponding defrosting operation. Set Δt to t2-t, reset the cumulative running time N of the compressor, set the number of defrosting times P to 1, and then return to step S112.

[0119] S8: Determine whether the collected indoor coil temperature IPT is less than or equal to the second set temperature. If it is less than or equal to the second set temperature, determine whether the collected cumulative compressor running time N is greater than or equal to the third set time. If IPT is greater than the second set temperature, return to step 5 to compare the size of IPT and IPTm. The second set temperature is less than the first set temperature, the second set temperature is 42℃, and the third set time is 50 minutes.

[0120] S9: When N is greater than or equal to the third set time, determine whether the number of defrosts collected P is equal to 0. When N is less than the third set time, return to step 5 to compare the size of IPT and IPTm.

[0121] S10: When P=0, perform defrosting operation, set Δt to t2-t, reset the compressor's cumulative running time N, set the defrosting count P to 1, and then return to step S112; when P is not equal to 0, proceed to step S11.

[0122] In this embodiment, the defrosting operation includes turning off the compressor, delaying for 30 seconds, turning off the four-way valve, turning off the outdoor fan and the indoor fan, delaying for 15 seconds, turning on the compressor, delaying for another 8 minutes, turning on the outdoor fan, delaying for 20 seconds to open the four-way valve, delaying for 5 seconds, and then turning on the indoor fan.

[0123] S11: Calculate the actual value of the time difference between the maximum temperature of the inner plate and the time when the defrosting temperature difference is met, Δt´= t2-t. Compare the set Δt with Δt´, i.e. Δt-(t2-t), and perform the corresponding defrosting operation. Set Δt to t2-t, reset the cumulative running time N of the compressor, set the number of defrosting times P to 1, and then return to step S112.

[0124] In steps S11, S17, and S22, the set Δt is compared with Δt´, i.e., Δt-(t2-t), and the corresponding defrosting operation is performed. Specifically, the operating conditions are as follows:

[0125] Condition 1: When Δt - (t2 - t) is greater than or equal to the first time difference, shut down the compressor, delay for 30 seconds, close the four-way valve, shut down the outdoor and indoor fans, delay for 15 seconds, turn on the compressor, delay for another 10 minutes, turn on the outdoor fan, delay for 20 seconds to open the four-way valve, delay for 5 seconds, and then turn on the indoor fan. The first time difference is 4 minutes.

[0126] Condition 2: When Δt - (t2 - t) is less than or equal to the second time difference, shut down the compressor, delay for 30 seconds, close the four-way valve, shut down the outdoor and indoor fans, delay for 15 seconds, turn on the compressor, delay for another 7 minutes, turn on the outdoor fan, delay for 20 seconds to open the four-way valve, delay for 5 seconds, and then turn on the indoor fan. The second time difference is -6 minutes.

[0127] Condition 3: When Δt-(t2-t) is greater than the second time difference and less than the first time difference, shut down the compressor, delay for 30 seconds, close the four-way valve, shut down the outdoor fan and the indoor fan, delay for 15 seconds, turn on the compressor, delay for another 8 minutes, turn on the outdoor fan, delay for 20 seconds to open the four-way valve, delay for 5 seconds, and then turn on the indoor fan.

[0128] By comparing Δt and Δt´, we can determine the rate of time decrease from the point when the inner plate's maximum temperature reaches its maximum to the point when the inner plate's maximum temperature reaches its minimum. This information is then used to determine the rate of frost formation and adjust the defrost time accordingly. When P is 0, since this is the first defrost operation, there is no need to judge Δt-(t2-t), and defrosting can proceed directly. When P is not equal to 0, since this is not the first defrost operation, it is necessary to judge Δt-(t2-t) to adjust the defrost time.

[0129] S4: When the cumulative time M during which the outdoor fan has stopped running is greater than or equal to the first set time, perform a defrosting operation and reset the cumulative time M during which the outdoor fan has stopped running; after step S4, return to step S112. The first set time is 120 minutes.

[0130] In this embodiment, the defrosting operation includes the following steps: turn off the compressor, delay for 30 seconds, close the four-way valve, turn off the outdoor fan and the indoor fan, delay for 15 seconds, turn on the compressor, delay for another 8 minutes, turn on the outdoor fan, delay for 20 seconds to open the four-way valve, delay for 5 seconds, and then turn on the indoor fan.

[0131] S12: When the cumulative time M of the outdoor fan stops running is less than the first set time, proceed to step 5 to compare the size of IPT and IPTm.

[0132] The following steps are also included in the operation of the air conditioner:

[0133] S23: When the cumulative compressor running time N is greater than or equal to the fourth set time and the indoor coil temperature is less than or equal to the third set temperature, a defrosting operation is performed, the defrosting count P is set to 1, and the cumulative compressor running time N is reset. After step S23, return to step S112. The fourth set time is 120 minutes, and the third set temperature is 35°C.

[0134] In this embodiment, the defrosting operation includes the following steps: turning off the compressor, delaying for 30 seconds, turning off the four-way valve, turning off the outdoor fan and the indoor fan, delaying for 15 seconds, turning on the compressor, delaying for another 8 minutes, turning on the outdoor fan, delaying for 20 seconds to open the four-way valve, delaying for 5 seconds, and then turning on the indoor fan.

[0135] To improve control accuracy, this application employs a multi-parameter monitoring approach under different operating conditions, enabling the air conditioner to defrost accurately. The corresponding operating conditions in each step are simultaneously monitored, and then one is selected for execution.

[0136] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A heating control method for an air conditioner, characterized in that, Includes the following steps: S1: When the air conditioner is in heating mode, monitor the operating parameters of the air conditioner, including the indoor coil temperature IPT and the cumulative time M during which the outdoor fan stops running; S2: Determine whether the collected indoor coil temperature IPT is greater than or equal to the set high temperature threshold. If it is greater than or equal to, control the outdoor fan to shut down and accumulate the downtime of the outdoor fan, and then proceed to step S3; if it is less than, maintain the heating mode and continue to monitor the operating parameters. S3: Determine whether the collected indoor coil temperature IPT is less than or equal to the first set temperature. If it is less than or equal to, control the outdoor fan to start, and pause the accumulation of the outdoor fan's stop running time M, and then proceed to step S4. S4: When the cumulative time M of the outdoor fan stopping operation is greater than or equal to the first set time, perform defrosting operation and reset the cumulative time M of the outdoor fan stopping operation. The high temperature threshold is greater than the first set temperature; The operating parameters in step S1 also include the number of defrost cycles P within a set time period, the cumulative operating time N of the compressor, and the time difference Δt between the set maximum internal plate temperature and the time when the defrost temperature difference is met; and after "if it is less than, then maintain the heating mode and continue to monitor the operating parameters" in step S2, the following steps are also included: S5: When the collected indoor coil temperature IPT is lower than the first set high temperature, compare the currently collected indoor coil temperature IPT with the set maximum indoor coil temperature IPTm. S6: When IPT is greater than or equal to IPTm, set the currently collected indoor coil temperature to the new maximum indoor coil temperature, and set the compressor running time t1 corresponding to the current collection time to the time t corresponding to the new maximum indoor coil temperature, i.e., t = t1. Otherwise, keep the values ​​of the maximum indoor coil temperature IPTm and the time t corresponding to the maximum indoor coil temperature unchanged. S7: Calculate ΔIPT = IPTm - IPT. When ΔIPT is greater than or equal to the first set temperature difference, set the compressor running time t1 at this time to the time t2 when defrosting meets the defrosting temperature difference, that is, t2 = t1, and then proceed to step S8. S8: Determine whether the collected indoor coil temperature IPT is less than or equal to the second set temperature. If it is less than or equal to the second set temperature, determine whether the collected compressor cumulative running time N is greater than or equal to the third set time. When IPT is greater than the second set temperature, return to step 5 to compare the size of IPT and IPTm; S9: When N is greater than or equal to the third set time, determine whether the number of defrosts collected P is equal to 0; when N is less than the third set time, return to step 5 to compare the size of IPT and IPTm. S10: When P=0, perform defrosting operation, set Δt to t2-t, reset the compressor's cumulative running time N, set the defrosting count P to 1, and then return to step S112; when P is not equal to 0, proceed to step S11. S11: Calculate the actual value of the time difference between the maximum temperature of the inner plate and the time when the defrosting temperature difference is met, Δt´= t2-t. Compare the set Δt with Δt´, i.e. Δt-(t2-t), and perform the corresponding defrosting operation. Set Δt to t2-t, reset the cumulative running time N of the compressor, set the number of defrosting times P to 1, and then return to step S112.

2. The heating control method for an air conditioner as described in claim 1, characterized in that, Step S2 specifically includes the following operating conditions: S2a: When the indoor coil temperature IPT is greater than or equal to the first set high temperature and less than the second set high temperature, control the outdoor fan to shut down, accumulate the downtime of the outdoor fan, and then proceed to step S3a. S2b: When the collected indoor coil temperature IPT is greater than or equal to the second set high temperature, control the compressor to shut down, the indoor fan to run at the set first wind speed, control the outdoor fan to shut down, and accumulate the stop time of the outdoor fan, and then proceed to step S3b. The steps in step S3 corresponding to running conditions S2a and S2b are as follows: S3a: When the collected indoor coil temperature IPT is less than or equal to the first set temperature, control the outdoor fan to start, and pause the accumulation of the outdoor fan's stop time M. S3b: When the collected indoor coil temperature IPT is less than or equal to the first set temperature, control the outdoor fan and compressor to start, the indoor fan to run at the set second wind speed, and the outdoor fan's stop time M is paused and accumulated.

3. The heating control method for an air conditioner as described in claim 2, characterized in that, The operating parameters in step S1 also include the compressor's operating time t1, and the specific operating parameters of the air conditioner monitored in step S1 are as follows: S111: After the air conditioner has been running in heating mode for the second set time, monitor the operating parameters of the air conditioner; S112: Collect the indoor coil temperature IPT, set the collected indoor coil temperature at this time as the maximum indoor coil temperature IPTm, and set the compressor running time t1 at this time as the time t corresponding to the maximum indoor coil temperature, i.e., t = t1. After step S4 is completed, return to step S112.

4. The heating control method for an air conditioner as described in claim 3, characterized in that, Before shutting down the outdoor fan in the operating condition step S2a, the following steps are also included: S21: Collect the indoor coil temperature IPT and compare the currently collected indoor coil temperature IPT with the currently set maximum indoor coil temperature IPTm; S22: When IPT is greater than or equal to IPTm, the temperature of the indoor coil currently collected is set to the new maximum temperature of the inner coil, and the running time t1 of the compressor corresponding to the current collection time is set to the time t corresponding to the new maximum temperature of the inner coil, i.e., t = t1. Otherwise, the values ​​of the maximum temperature of the inner coil IPTm and the time t corresponding to the maximum temperature of the inner coil remain unchanged. The steps S3 mentioned above, corresponding to operating conditions S2a and S2b respectively, also include the following steps: S311: When the collected indoor coil temperature IPT is greater than the first set temperature, then return to step S21 to determine the magnitude of IPT and IPTm; S321: When the collected indoor coil temperature IPT is greater than the first set temperature, compare the currently collected indoor coil temperature IPT with the currently set maximum indoor coil temperature IPTm. S322: When IPT is greater than or equal to IPTm, set the currently collected indoor coil temperature to the new maximum indoor coil temperature, and set the compressor running time t1 corresponding to the current collection time to the time t corresponding to the new maximum indoor coil temperature, i.e., t=t1. Otherwise, keep the values ​​of the maximum indoor coil temperature IPTm and the time t corresponding to the maximum indoor coil temperature unchanged, and then return to step S2b to control the compressor to shut down, the indoor fan to run at the set first fan speed, and control the outdoor fan to shut down.

5. The heating control method for an air conditioner as described in claim 1, characterized in that, The step S4 is followed by the following step: S12: When the cumulative time M of the outdoor fan stop running is less than the first set time, proceed to step 5 to compare the size of IPT and IPTm.

6. The heating control method for an air conditioner as described in claim 1, characterized in that, The operating parameters in step S1 also include the air speed of the indoor fan; after step S7, the following steps are also included: S13: When ΔIPT is less than the first set temperature difference, determine whether the cumulative running time N of the compressor is greater than or equal to the fourth set time and whether the indoor coil temperature IPT is less than or equal to the third set temperature. When N ≥ the fourth set time and IPT ≤ the third set temperature, perform defrosting operation, reset the cumulative running time N of the compressor, set the number of defrosting times P to 1, and then return to step S112; when neither condition is met, compare the collected indoor coil temperature with the second set temperature. S14: When IPT > the second set temperature, determine whether the indoor fan is running at the set third wind speed; when IPT ≤ the second set temperature, return to step 5 to compare the size of IPT and IPTm. S15: When the indoor fan is running at the third wind speed, calculate ΔIPT = IPTm - IPT. When ΔIPT is greater than or equal to the second set temperature difference, set the compressor running time t1 corresponding to the data collection to the time t2 when defrosting meets the defrosting temperature difference, i.e., t2 = t1, and determine whether the collected defrosting times P is equal to 0. When ΔIPT is less than the second set temperature difference, return to step 5 to compare the size of IPT and IPTm. S16: When P=0, perform defrosting operation, set Δt to t2-t, reset the compressor's cumulative running time N, set the defrosting count P to 1, and then return to step S112; when P is not equal to 0, proceed to step S17. S17: Calculate the actual value of the time difference between the maximum temperature of the inner plate and the time when the defrosting temperature difference is met, Δt´= t2-t. Compare the set Δt with Δt´, i.e. Δt-(t2-t), and perform the corresponding defrosting operation. Set Δt to t2-t, reset the cumulative running time N of the compressor, set the number of defrosting times P to 1, and then return to step S112.

7. The heating control method for an air conditioner as described in claim 6, characterized in that, The following steps are included after step S7: S18: When ΔIPT is less than the first set temperature difference, determine whether the cumulative time N of the compressor operation is greater than or equal to the fifth set time. If N ≥ the fifth set time, determine whether the temperature of the indoor coil is greater than the second set temperature. If N is less than the fifth set time, return to step 5 to compare the size of IPT and IPTm. S19: When IPT > the second set temperature, determine whether the indoor fan is running at the set third wind speed; when IPT ≤ the second set temperature, return to step 5 to compare the size of IPT and IPTm. S20: When the indoor fan is running at the third wind speed, calculate ΔIPT = IPTm - IPT. When ΔIPT is greater than or equal to the second set temperature difference, set the compressor running time t1 corresponding to the data collection to the time t2 when defrosting meets the defrosting temperature difference, i.e., t2 = t1, and determine whether the collected defrosting times P is equal to 0. When ΔIPT is less than the second set temperature difference, return to step 5 to compare the size of IPT and IPTm. S21: When P=0, perform defrosting operation, set Δt to t2-t, reset the compressor's cumulative running time N, set the defrosting count P to 1, and then return to step S112; when P is not equal to 0, proceed to step S22. S22: Calculate the actual value of the time difference between the maximum temperature of the inner plate and the time when the defrosting temperature difference is met, Δt´= t2-t. Compare the set Δt with Δt´, i.e. Δt-(t2-t), and perform the corresponding defrosting operation. Set Δt to t2-t, reset the cumulative running time N of the compressor, set the number of defrosting times P to 1, and then return to step S112.

8. The heating control method for an air conditioner as described in any one of claims 1-7, characterized in that, The defrosting operation in step S4 includes the following steps: Turn off the compressor, delay for 30 seconds, close the four-way valve, turn off the outdoor and indoor fans, delay for 15 seconds, turn on the compressor, delay for another 8 minutes, turn on the outdoor fan, delay for 20 seconds to open the four-way valve, delay for 5 seconds, and then turn on the indoor fan.

9. The heating control method for an air conditioner as described in claim 8, characterized in that, The operating parameters in step S1 also include the cumulative compressor operating time N and the number of defrost cycles P within the set time period; and also include the following steps: S23: When the cumulative running time N of the compressor is greater than or equal to the fourth set time and the temperature of the indoor coil is less than or equal to the third set temperature, a defrosting operation is performed, the number of defrosts P is set to 1, and the cumulative running time N of the compressor is reset.

10. The heating control method for an air conditioner as described in any one of claims 1, 6, and 7, characterized in that, The set Δt is compared with Δt´, i.e., Δt-(t2-t), and the corresponding defrosting operation is performed, specifically including the following operating conditions: When Δt-(t2-t) is greater than or equal to the first time difference, shut down the compressor, delay for 30 seconds, close the four-way valve, shut down the outdoor and indoor fans, delay for 15 seconds, turn on the compressor, delay for another 10 minutes, turn on the outdoor fan, delay for 20 seconds to open the four-way valve, delay for 5 seconds, and then turn on the indoor fan. When Δt-(t2-t) is less than or equal to the second time difference, shut down the compressor, delay for 30 seconds, close the four-way valve, shut down the outdoor and indoor fans, delay for 15 seconds, turn on the compressor, delay for another 7 minutes, turn on the outdoor fan, delay for 20 seconds to open the four-way valve, delay for 5 seconds, and then turn on the indoor fan. When Δt-(t2-t) is greater than the second time difference and less than the first time difference, the compressor is turned off, the four-way valve is turned off after a 30-second delay, the outdoor and indoor fans are turned off, the compressor is turned on after a 15-second delay, the outdoor fan is turned on after an 8-minute delay, the four-way valve is turned on after a 20-second delay, and the indoor fan is turned on after a 5-second delay.

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