Control method for heating device of air-conditioning system and air-conditioning system

Abstract

The present invention provides a control method for a heating device of an air conditioning system and an air conditioning system, which can use a heating device to assist in heating the air conditioning system while avoiding the temperature of the heating device being too high or rising too fast. The control method includes the following steps: an ambient temperature detection step of detecting the initial indoor ambient temperature; a preliminary judgment step of comparing the initial indoor ambient temperature with the air conditioning set temperature and comparing the initial indoor ambient temperature with a preset ambient temperature. If it is satisfied that the initial indoor ambient temperature is less than the air conditioning set temperature and the initial indoor ambient temperature is not greater than the preset ambient temperature, then enter a circulation process. The circulation process includes the following steps: a circulation detection step of detecting the current indoor ambient temperature and the air outlet temperature; a judgment step of turning on the heating device if it is satisfied that the air outlet temperature is not greater than the preset air outlet temperature, and turning off the heating device if the difference between the air conditioning set temperature and the current indoor ambient temperature is less than the minimum threshold or the air outlet temperature is not less than the preset air outlet temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and specifically, to a control method for a heating device of an air conditioning system and an air conditioning system. Background Art

[0002] With the rapid increase in the installation volume of air conditioners, air conditioning systems also face various installation environments. Among them, for environments with relatively low ambient temperatures, relying solely on the heating cycle of the air conditioner often cannot meet the heating requirements of the indoor environment. In response to this, a technical solution has been proposed in the prior art to provide a heating device at the air outlet of the indoor unit of the air conditioner, so that when the heating capacity of the air conditioning system is insufficient, the heating device can be turned on for heating compensation.

[0003] Among them, some control methods for starting and stopping the heating device of the air conditioning system have also been proposed in the prior art. For example, Chinese Patent CN102538132A discloses an intelligent control method for an air conditioner with auxiliary electric heating. The air conditioner includes an auxiliary electric heater, and the auxiliary electric heater includes two or more auxiliary electric heating units that can be independently controlled. Through the control system of the air conditioner, according to the indoor ambient temperature value T_inner, the indoor evaporator temperature value T_inner_pipe, and the set temperature value T_set, intelligent hierarchical control is performed on the auxiliary electric heating, and each auxiliary electric heating unit is instructed to be in the on or off working mode.

[0004] Since the electric heating is installed at the air outlet of the indoor unit, that is, the air first exchanges heat with the evaporator coil of the indoor unit and then exchanges heat with the electric heater, the temperature of the evaporator coil of the indoor unit has no direct relationship with the temperature of the electric heater. The temperature of the evaporator coil of the indoor unit can only represent the operating state of the air conditioning system and is easily affected by various factors such as ambient temperature, compressor frequency, and indoor fan speed, resulting in fluctuations.

[0005] Furthermore, for an air conditioning system that uses high-power electric heating wires (such as 15kW, 20kW) as the heating device for heating compensation, there is a large impact on the power grid at the moment of starting the electric heating wire, and the air outlet temperature of the indoor unit of the air conditioning system can reach 90°C or even higher instantaneously, causing the surface of the electric heating wire to turn red and triggering the built-in temperature controller / fuse protection of the electric heating wire, affecting the service life of the electric heating wire, and even causing a fire. Summary of the Invention

[0006] Aiming at the above technical problems in the prior art, the purpose of the present invention is to provide a control method for a heating device of an air conditioning system and an air conditioning system that can use the heating device to assist in heating the air conditioning system while avoiding the temperature of the heating device from being too high or rising too fast.

[0007] The control method for the heating device of the air conditioning system provided by the present invention includes the following steps:

[0008] Environmental temperature detection step, detecting the initial indoor environmental temperature;

[0009] Pre - judgment step, obtaining the air - conditioner set temperature and the preset environmental temperature, comparing the initial indoor environmental temperature with the air - conditioner set temperature, and comparing the initial indoor environmental temperature with the preset environmental temperature. If the initial indoor environmental temperature is less than the air - conditioner set temperature and the initial indoor environmental temperature is not greater than the preset environmental temperature, enter the loop process; if not, return to the environmental temperature detection step.

[0010] The loop process includes the following steps:

[0011] Loop detection step, continuously detecting the current indoor environmental temperature and the air - outlet temperature of the indoor unit of the air - conditioner system.

[0012] Judgment step, providing a preset air - outlet temperature, comparing the air - outlet temperature with the preset air - outlet temperature. If the air - outlet temperature is not greater than the preset air - outlet temperature, turn on the heating device; if the difference between the air - conditioner set temperature and the current indoor environmental temperature is less than the minimum threshold or the air - outlet temperature is not less than the preset air - outlet temperature, turn off the heating device.

[0013] According to the technical solution of the present invention, first, through the environmental temperature detection step and the pre - judgment step, it is judged whether the heating effect of the air - conditioner system can meet the heating demand, that is, whether the indoor unit of the air - conditioner system can heat the indoor environmental temperature to the air - conditioner set temperature and not be lower than the preset environmental temperature. Here, the preset environmental temperature can be the temperature at which the user feels comfortable, and there is no limit here. For example, it can be set to 26 °C. When the indoor environmental temperature cannot reach the air - conditioner set temperature, it is considered that the current heating effect of the air - conditioner is not sufficient to meet the demand of the air - conditioner set temperature. However, this may also be due to too high an air - conditioner set temperature or a short air - conditioner startup time, which may not necessarily affect the user's body feeling. Further, in combination with the preset environmental temperature, when the indoor environmental temperature cannot reach the preset environmental temperature, it is considered that the current indoor environmental temperature will make people feel cold, and it is necessary to increase the heating efficiency. Enter the loop process to judge whether to turn on the heating device.

[0014] Secondly, in the loop process, continuous cyclic detection and judgment are used to adjust the start - stop of the heating device, so as to be able to control the room temperature more timely and avoid the state of "sudden cold and sudden heat". In particular, the detection of the air - outlet temperature and the setting of the preset air - outlet temperature are also added in the loop process. Here, the preset air - outlet temperature can be any temperature value lower than the safety temperature of the heating device, and there is no limit here. By using the comprehensive judgment of the indoor environmental temperature, the preset environmental temperature and the air - outlet temperature to control the opening of the heating device, it can not only avoid the problem of sudden cold and sudden heat caused by frequent protection of the thermostat, but also avoid the fuse melting caused by too high an air - outlet temperature, so that the air - conditioner can meet the heating demand in time and improve the stability of the electric heating operation of the air - conditioner.

[0015] As a preferred technical solution of the present invention, the heating device includes a two-stage heater composed of a first heater and a second heater, and the judging step includes the following sub-steps:

[0016] The first start judgment step: When the first heater is closed and the second heater is closed, the first start judgment step is executed to obtain a first preset air outlet temperature, compare the air outlet temperature with the first preset air outlet temperature. If it is satisfied that the air outlet temperature is not greater than the first preset air outlet temperature, the first heater is turned on. If not, return to the loop detection step;

[0017] The second start judgment step: When the first heater is turned on and the second heater is closed, the second start judgment step is executed to obtain a second preset air outlet temperature, compare the air outlet temperature with the second preset air outlet temperature, and calculate the difference between the current indoor environment temperature and the air conditioner set temperature and the growth rate of the current indoor environment temperature relative to the initial indoor environment temperature over time. If all of the following are satisfied at the same time: the air outlet temperature is not greater than the second preset air outlet temperature, the difference between the current indoor environment temperature and the air conditioner set temperature is not less than a first threshold value, and the growth rate is not greater than a preset rate, then both the first heater and the second heater are turned on at the same time. If not, return to the loop detection step.

[0018] According to this preferred technical solution, in the first start judgment step, by simply comparing the air outlet temperature with the first preset air outlet temperature, the first heater can be turned on conveniently and quickly. For the second heater with higher heating efficiency, it is necessary to further judge whether the first heater cannot meet the heating demand or whether it is just that the first heater has been turned on for not enough time, so as to avoid the heating device from being protected due to too fast temperature rise and affecting the heating effect. Therefore, in the second start judgment step, considering that the air outlet temperature is not greater than the second preset air outlet temperature, whether the difference between the current indoor environment temperature and the air conditioner set temperature is less than the first threshold value, and whether the growth rate of the indoor environment temperature meets the preset rate, it can be determined whether the current air outlet temperature may exceed the safe temperature, whether the current indoor environment temperature is close to the air conditioner set temperature, and whether the growth of the indoor environment temperature tends to be stable. Only when there is still a margin between the current air outlet temperature and the safe temperature, the growth of the indoor environment temperature has tended to be stable, but the current indoor environment temperature is still far from the air conditioner set temperature, is it necessary to turn on the second heater. Thus, the turning-on methods of different heating sections can be more accurately regulated through segmented and different judgment criteria, and the indoor temperature can be kept rising and falling smoothly.

[0019] As a preferred technical solution of the present invention, the judging step further includes the following sub-steps:

[0020] The first shutdown determination step: When the first heater and the second heater are both turned on, the first shutdown determination step is executed to provide the highest air outlet temperature, compare the air outlet temperature with the highest air outlet temperature, and calculate the difference between the current indoor ambient temperature and the air conditioner set temperature. If the air outlet temperature is not less than the highest air outlet temperature, or the difference between the current indoor ambient temperature and the air conditioner set temperature is not greater than the second threshold, then the second heater is turned off. If not satisfied, return to the loop detection step;

[0021] The second shutdown determination step: When the first heater is turned on, the second shutdown determination step is executed to calculate the difference between the current indoor ambient temperature and the air conditioner set temperature. If the difference between the current indoor ambient temperature and the air conditioner set temperature is not greater than the third threshold, then the first heater is turned off. If not satisfied, return to the loop detection step.

[0022] According to this preferred technical solution, when the heating devices are turned on simultaneously, the rising rate of the air outlet temperature is relatively fast. Therefore, it is necessary to detect and compare the air outlet temperature with the highest air outlet temperature in real time through the first shutdown determination step, as well as the current indoor ambient temperature and the air conditioner set temperature, so as to be able to timely turn off the second heater when the air outlet temperature is too high or the heating efficiency is excessive, and only heat through the first heater, so as to be able to gently adjust the indoor ambient temperature while avoiding the temperature control protection or fuse protection phenomenon of the heating device caused by too high an air outlet temperature.

[0023] Furthermore, in the case where the first heater heats alone, the increase in the air outlet temperature is relatively gentle. Therefore, when there is no need for the second heater to supplement heating, as long as it is detected that the current indoor ambient temperature is close to or equal to the air conditioner set temperature, it can be considered that there is no need for the heating device to assist in heating, and thus the entire heating device is turned off.

[0024] As a preferred technical solution of the present invention, the first threshold, the second threshold, and the third threshold decrease in sequence, and the third threshold is not greater than 0.5.

[0025] According to this preferred technical solution, by controlling the heating device in segments, the indoor ambient temperature can be limited to gently approach the air conditioner set temperature in a way that the threshold gradually decreases, and the magnitude of the third threshold can directly determine the final control accuracy of this control method. Controlling it within 0.5 can enable the air conditioner system controlled by this control method to more accurately reach the air conditioner set temperature selected by the user.

[0026] As a preferred technical solution of the present invention, the first preset air outlet temperature, the second preset air outlet temperature, and the highest air outlet temperature increase in sequence, and the highest air outlet temperature is not greater than the minimum value of the protection temperature and the fuse temperature of the thermostat of the heating device.

[0027] According to this preferred technical solution, the first preset air outlet temperature in the first opening determination step is the lowest. This is because the first heater has not been turned on yet, and there is still a large temperature increase space in the subsequent process. Therefore, if the air outlet temperature is relatively high at this time, it may cause the temperature to exceed the safety temperature of the heating device during the subsequent temperature increase process. With the subsequent opening of the second heater, the second preset air outlet temperature is set. There is still a margin between the second preset air outlet temperature and the highest air outlet temperature at this time, thereby further avoiding safety problems caused by the rapid increase in the air outlet temperature by the heating device. Finally, after both heaters are turned on, it is necessary to monitor in real time whether the air outlet temperature exceeds the protection temperature. Therefore, by comparing with the highest air outlet temperature lower than the safety temperature, it is possible to effectively avoid the situation of temperature control protection or fuse protection caused by the air outlet temperature exceeding the safety temperature.

[0028] As a preferred technical solution of the present invention, the control method of the heating device of the air conditioning system further includes:

[0029] An active determination step, in response to a heating signal sent by the remote controller / line controller of the air conditioning system,

[0030] Obtain the current opening status of the heating device. If the heating device is not turned on, execute the first opening determination step. If the first heater is turned on and the second heater is not turned on, execute the second opening determination step and the second closing determination step. If both the first heater and the second heater are turned on, execute the first closing determination step.

[0031] According to this preferred technical solution, by receiving the heating signal of the remote controller / line controller, it is possible to directly enter the loop process to determine whether to turn on the heating device for auxiliary heating without pre-judgment, thereby reducing unnecessary judgment steps and responding in a timely manner when the user needs to actively turn on the heating device.

[0032] The present invention also provides an air conditioning system, including a two-stage heater composed of a first heater and a second heater, capable of executing the control method of the air conditioning system in any of the above technical solutions or a combination of multiple technical solutions. The air conditioning system further includes: a detection unit for detecting the indoor environmental temperature and the air outlet temperature; a judgment unit for generating a control instruction according to the detection result of the detection unit; a control unit for receiving the control instruction of the judgment unit and controlling the opening and closing of the heating device. Description of the Drawings

[0033] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present invention will become more apparent:

[0034] Figure 1 It is a schematic structural diagram of an air conditioning system provided by an embodiment of the present invention.

[0035] Figure 2 It is a schematic diagram of software modules of an air-conditioning system provided by an embodiment of the present invention.

[0036] Figure 3 It is a schematic flow chart of a control method for an air-conditioning system provided by an embodiment of the present invention;

[0037] Figure 4 It is a preferred schematic flow chart of a control method for an air-conditioning system provided by an embodiment of the present invention.

[0038] Description of reference numerals

[0039] 1 - Evaporator coil; 2 - Indoor motor; 3 - Heating device; 4 - Outlet air temperature sensor; 5 - Indoor temperature sensor; 6 - Control device; 61 - Detection unit; 62 - Judgment unit; 63 - Control unit. Detailed implementation manners

[0040] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all belong to the protection scope of the present invention.

[0041] Figure 1 It is a schematic structural diagram of an air-conditioning system provided by this embodiment. As Figure 1As shown in the figure, the indoor unit of the air conditioning system in this embodiment has an indoor motor 2, an evaporator coil 1, an indoor temperature sensor 5, a heating device 3, and an outlet air temperature sensor 4. Among them, the evaporator coil 1 is arranged on the upstream side of the heating device 3. The evaporator coil 1 dissipates heat to the indoor motor 2, and the indoor motor 2 blows hot air outwards. The heating device 3 is arranged on the air outlet side of the indoor motor 2, and the outlet air temperature sensor 4 is arranged on the air outlet side of the heating device 3, that is, at the air outlet of the indoor unit. Therefore, the air blown out by the indoor motor 2 will be blown out from the air outlet after being heated by the heating device 3. Therefore, the temperature of the outlet air temperature sensor 4 can truly reflect the heating air temperature of the heating device 3, and the indoor temperature sensor 5 can be arranged at any position in the room where the indoor unit is located, preferably near the air conditioner or the position where the user often stays, so as to better reflect the current body feeling temperature of the user. In particular, the heating device 3 in this embodiment includes a two-stage heater composed of a first heater and a second heater (not shown in the figure). Specifically, there is a sequence for the multi-stage heating device 3 to be turned on / off. The second heater can only be turned on on the premise that the first heater is turned on; the first heater needs to be turned off later than or simultaneously with the second heater. Therefore, when the second heater is turned on, it means that both the first heater and the second heater are turned on at the same time, and when the first heater is turned off, it also corresponds to the situation where both the first heater and the second heater are turned off at the same time. In this embodiment, the first heater and the second heater are only for facilitating the description of the control method of segmented adjustment, and do not specifically refer to two independently arranged heaters.

[0042] Figure 2 It is a schematic diagram of the software module of an air conditioning system provided by this embodiment. Combining Figure 1 and Figure 2 it can be seen that the air conditioning system in this embodiment also has a control device 6. The control device 6 can be an external computer structure or a composite structure of a memory and a controller built into the air conditioning system. The control device 6 includes: a detection unit 61, a judgment unit 62, and a control unit 62. Among them, the detection unit 61 can receive and obtain the detection results of the indoor temperature sensor 5 and the outlet air temperature sensor 4, so as to obtain the indoor environmental temperature and the outlet air temperature; the judgment unit 62 is used to analyze, compare or calculate according to the detection results of the detection unit 61, and generate a control instruction according to the calculation result; the control unit 62 can receive the control instruction of the judgment unit 62 and control the on and off of the first heater and the second heater of the heating device 3.

[0043] Specifically, the heating device 3 of the air conditioning system in this embodiment can use a high-power electric heating wire for heating compensation. However, when the high-power electric heating wire starts, it has a large impact on the power grid, and the air outlet temperature of the air conditioner can reach 90°C or even higher, causing the surface of the electric heating wire to turn red and then triggering the built-in temperature controller protection of the electric heating wire, affecting the service life of the electric heating wire. Even worse, it may lead to a fire. Moreover, when the indoor ambient temperature is relatively high and the user forcibly turns on the electric heating for heating through the remote control / line controller, the air outlet temperature of the air conditioner and the surface temperature of the electric heating wire will be even higher, even causing the fuse of the electric heating wire to blow and unable to heat, affecting the user's heating experience. Most of the existing technologies have drawbacks in controlling the electric heating through the indoor coil temperature.

[0044] As an example, in this embodiment, a vertical and horizontal duct air conditioner is equipped with a 15kW electric heating device. The electric heating device is located on the air outlet side of the indoor motor 2 and is divided into two sections, namely 7.5kW + 7.5kW. Each section is respectively connected in series with a temperature controller (Tw = 60°C) and a fuse (Tfu = 90°C). When the electric heating is fully open, the peak current is greater than 65A under the rated voltage. When the indoor ambient temperature is relatively high, it will cause the temperature controller protection action or the temperature to rise too fast, resulting in the fuse blowing.

[0045] Next, based on the above air conditioning system, the control method of the heating device of an air conditioning system provided by the present invention will be further explained and illustrated in combination with specific embodiments. It should be noted that the air conditioning system controlled by the control method of the heating device of an air conditioning system provided by the present invention can at least include the above indoor motor 2, heating device 3, indoor temperature sensor 5, and air outlet temperature sensor 4. Other components can be freely combined and connected according to requirements. Any air conditioning system including the indoor motor 2, heating device 3, indoor temperature sensor 5, and air outlet temperature sensor 4 can operate the control method of the heating device of an air conditioning system provided by the present invention, which belongs to the protection scope of the present invention.

[0046] Figure 3 It is a flowchart of the control method of the heating device of the air conditioning system in the embodiment of the present invention. As Figure 3 shown, the control method in this embodiment includes the following steps:

[0047] Ambient temperature detection step S1, detecting the initial indoor ambient temperature T1;

[0048] Pre - judgment step S2: Obtain the air - conditioner set temperature Ts and the preset ambient temperature Tn. Compare the initial indoor ambient temperature T1 with the air - conditioner set temperature Ts, and compare the initial indoor ambient temperature T1 with the preset ambient temperature Tn. If the initial indoor ambient temperature T1 is less than the air - conditioner set temperature Ts and the initial indoor ambient temperature T1 is not greater than the preset ambient temperature Tn (T1 < Ts and T1 ≤ Tn), then enter the loop process S3. If not satisfied, return to the ambient temperature detection step S1.

[0049] The loop process S3 includes the following steps:

[0050] Loop detection step S31: Continuously detect the current indoor ambient temperature T2 and the air - outlet temperature Tf of the indoor unit of the air - conditioner system.

[0051] Judgment step S32: Provide a preset air - outlet temperature Tfn. Compare the air - outlet temperature Tf with the preset air - outlet temperature Tfn. If the air - outlet temperature is not greater than the preset air - outlet temperature (Tf ≤ Tfn), turn on the heating device. If the difference between the air - conditioner set temperature Ts and the current indoor ambient temperature T2 is less than the minimum threshold S or the air - outlet temperature Tf is not less than the preset air - outlet temperature Tfn (Ts - T2 < S or Tf ≥ Tfn), turn off the heating device.

[0052] Specifically, first, execute the ambient temperature detection step S1. The detection unit 61 obtains the indoor ambient temperature detected by the indoor temperature sensor 5 and records it as the initial indoor ambient temperature T1. Then execute the pre - judgment step S2 to obtain the air - conditioner set temperature Ts set by the user and the preset ambient temperature Tn set in advance. The preset ambient temperature here can be the temperature at which the user feels comfortable, and there is no limit here. For example, in this embodiment, Tn can be taken as 26°C. The judgment unit 62 compares the initial indoor ambient temperature T1 with the air - conditioner set temperature Ts and compares the initial indoor ambient temperature T1 with the preset ambient temperature Tn. If T1 < Ts and T1 ≤ Tn, then execute the loop process S3. If not satisfied, return to the ambient temperature detection step S1.

[0053] Then the detection unit 61 executes the loop detection step S31, continuously obtains the detection results of the indoor temperature sensor 5 and the air - outlet temperature sensor 4, and records them as the current indoor ambient temperature T2 and the air - outlet temperature Tf. Then the judgment unit 62 executes the judgment step S32, provides a preset air - outlet temperature Tfn, for example, it can be any temperature value lower than the protection temperature of the heating device. Compare the air - outlet temperature Tf with the preset air - outlet temperature Tfn. If Tf ≤ Tfn, generate a heating device turn - on instruction. If Ts - T2 < S or Tf ≥ Tfn, generate a heating device turn - off instruction. The control unit 62 receives the control instruction sent by the judgment unit 62 and controls the heating device to turn on or off.

[0054] In this embodiment, first, through the ambient temperature detection step S1 and the pre-judgment step S2, it is determined whether the heating effect of the air-conditioning system can meet the heating demand, that is, whether the indoor unit of the air-conditioning system can heat up the initial indoor environmental temperature T1 to the air-conditioning set temperature Ts and not be lower than the preset environmental temperature Tn. When the initial indoor environmental temperature T1 cannot reach the air-conditioning set temperature Ts, it is considered that the current heating effect of the air conditioner is insufficient to meet the demand of the air-conditioning set temperature. However, this may also be due to the fact that the air-conditioning set temperature Ts is too high or the air conditioner has been turned on for a short time, which may not necessarily affect the user's body feeling. Further, in combination with the preset environmental temperature Tn, when the initial indoor environmental temperature T1 cannot reach the preset environmental temperature Tn, it is considered that the current heating effect is insufficient and the user feels cold, and it is necessary to increase the heating efficiency. Then, enter the loop process S3 to determine whether to turn on the heating device. Secondly, in the loop process S3, continuous loop detection and judgment are used to adjust the start and stop of the heating device, so that the room temperature can be adjusted more timely and the state of "sudden cold and sudden heat" can be avoided. In particular, the detection of the outlet air temperature Tf and the setting of the preset outlet air temperature Tfn are also added in the loop process S3. Among them, the preset outlet air temperature Tfn can be any temperature value lower than the safety temperature of the heating device, which is not limited here. By comprehensively judging the indoor environmental temperature, the preset environmental temperature and the outlet air temperature to control the opening of the heating device, it can not only avoid the problem of sudden cold and sudden heat caused by frequent protection of the thermostat, but also avoid the fuse from melting due to too high outlet air temperature, so that the air conditioner can meet the heating demand in time and improve the stability of the electric heating operation of the air conditioner.

[0055] Figure 4 It is a flowchart of a control method for a heating device of a preferred air-conditioning system provided by an embodiment of the present invention. As Figure 4 shown, the judgment step S32 includes the following sub-steps:

[0056] The first start judgment step S321. When the first heater is closed and the second heater is closed, the first start judgment step S321 is executed to obtain the first preset outlet air temperature Tf1, compare the outlet air temperature Tf with the first preset outlet air temperature Tf1. If the outlet air temperature Tf is not greater than the first preset outlet air temperature Tf1, turn on the first heater. If not, return to the loop detection step S31;

[0057] Second opening determination step S322: When the first heater is turned on and the second heater is turned off, the second opening determination step S322 is executed to obtain the second preset air outlet temperature Tf2. The air outlet temperature Tf is compared with the second preset air outlet temperature Tf2, and the difference between the current indoor ambient temperature T2 and the air conditioner set temperature Ts is calculated, as well as the growth rate of the current indoor ambient temperature T2 relative to the initial indoor ambient temperature T1 over time (T2 - T1) / t. If all of the following conditions are met simultaneously: the air outlet temperature Tf is not greater than the second preset air outlet temperature Tf2, the difference between the current indoor ambient temperature T2 and the air conditioner set temperature Ts is not less than the first threshold S1, and the growth rate (T2 - T1) / t is not greater than the preset rate k, that is, (Tf ≤ Tf2, Ts - T2 ≥ S1, and (T2 - T1) / t ≤ k), then both the first heater and the second heater are turned on. If not, return to the loop detection step S31.

[0058] First closing determination step S323: When both the first heater and the second heater are turned on, the first closing determination step S323 is executed to provide the maximum air outlet temperature Tf3. The air outlet temperature Tf is compared with the maximum air outlet temperature Tf3, and the difference between the current indoor ambient temperature T2 and the air conditioner set temperature Ts is calculated. If the air outlet temperature Tf is not less than the maximum air outlet temperature Tf3, or the difference between the current indoor ambient temperature T2 and the air conditioner set temperature Ts is not greater than the second threshold S2, that is, (Tf ≥ Tf3 or Ts - T2 ≤ S2), then the second heater is turned off. If not, return to the loop detection step S31;

[0059] Second closing determination step S324: When the first heater is turned on, the second closing determination step S324 is executed to calculate the difference between the current indoor ambient temperature T2 and the air conditioner set temperature Ts. If the difference between the current indoor ambient temperature T2 and the air conditioner set temperature Ts is not greater than the third threshold S3 (Ts - T2 ≤ S3), then the first heater is turned off. If not, return to the loop detection step.

[0060] Among them, preferably, the first threshold S1, the second threshold S2, and the third threshold S3 decrease in sequence, and the third threshold S3 is not greater than 0.5. For example, the first threshold S1, the second threshold S2, and the third threshold S3 can be 5°C, 2°C, and 0.5°C. By controlling the heating device in segments, the indoor ambient temperature can be restricted to approach the air conditioner set temperature Ts smoothly in a way that the threshold gradually decreases. The magnitude of the third threshold S3 can directly determine the final control accuracy of this control method. Controlling it within 0.5 can enable the air conditioner system controlled by this control method to more accurately reach the air conditioner set temperature Ts selected by the user.

[0061] Preferably, the first preset air outlet temperature Tf1, the second preset air outlet temperature Tf2, and the highest air outlet temperature Tf3 increase in sequence. For example, the first preset air outlet temperature Tf1, the second preset air outlet temperature Tf2, and the highest air outlet temperature Tf3 can be 35°C, 50°C, and 60°C. Among them, the interval between the first preset air outlet temperature Tf1 and the second preset air outlet temperature Tf2 is larger, so as to give the first heater a greater temperature increase space. The highest air outlet temperature Tf3 is not greater than the minimum value of the protection temperature (60°C) and the fusing temperature (90°C) of the temperature controller of the heating device.

[0062] Specifically, the first preset air outlet temperature Tf1 is the lowest in the first start judgment step S321. This is because the first heater has not been turned on yet, and there is still a large temperature increase space in the follow-up. Therefore, if the air outlet temperature is relatively high at this time, it may cause the temperature to exceed the safety temperature of the heating device during the subsequent temperature increase process. With the subsequent turning on of the second heater, the second preset air outlet temperature Tf2 is set. There is still a margin between the second preset air outlet temperature Tf2 and the highest air outlet temperature Tf3 at this time, so as to further avoid safety problems caused by the heating device quickly increasing the air outlet temperature. Finally, after both heaters are turned on, it is necessary to monitor in real time whether the air outlet temperature Tf exceeds the protection temperature. Therefore, by comparing with the highest air outlet temperature Tf3 that is less than the safety temperature, it is possible to effectively avoid the situation of temperature control protection or fusing protection caused by the air outlet temperature Tf exceeding the safety temperature.

[0063] In this embodiment, in the first start judgment step S321, by simply comparing the air outlet temperature Tf with the first preset air outlet temperature Tf1, the first heater can be turned on, which is convenient and fast. For the second heater with higher heating efficiency, it is necessary to further judge whether the first heater cannot meet the heating demand or just the first heater has been turned on for not enough time, so as to avoid the safety protection of the heating device due to too fast temperature increase and affect the heating effect. Therefore, in the second start judgment step S322, considering that the air outlet temperature Tf is not greater than the second preset air outlet temperature Tf2, whether the difference between the current indoor environment temperature T2 and the air conditioner set temperature Ts is less than the first threshold S1, and whether the growth rate of the indoor environment temperature (T2 - T1) / t meets the preset rate k, it can be determined whether the current air outlet temperature Tf may exceed the safety temperature, whether the current indoor environment temperature T2 is close to the air conditioner set temperature Ts, and whether the growth of the indoor environment temperature tends to be stable. Only when there is still a margin between the current air outlet temperature Tf and the safety temperature and the growth of the indoor environment temperature has tended to be stable but the current indoor environment temperature T2 is still far from the air conditioner set temperature T2, is it necessary to turn on the second heater. Thus, it is possible to more precisely control the turning-on methods of different heating sections through segmented and different judgment criteria, and keep the indoor temperature rising and falling smoothly.

[0064] Furthermore, when the heating devices are turned on simultaneously, the rising rate of the air outlet temperature is relatively fast. Therefore, it is necessary to detect and compare the air outlet temperature Tf and the maximum air outlet temperature Tf3 in real time through the first closing judgment step S323, as well as the current indoor ambient temperature T2 and the air conditioner set temperature Ts, so as to be able to timely turn off the second heater when the air outlet temperature Tf is too high or the heating efficiency is excessive, and only heat through the first heater, so that while gently adjusting the indoor ambient temperature, it is possible to avoid the temperature control protection or fuse protection phenomenon of the heating device caused by the too high air outlet temperature Tf. In addition, when the first heater heats alone, the increase in the air outlet temperature is relatively gentle. Therefore, when the second heater does not need to supplement the heating, it is only necessary to detect that the indoor ambient temperature is close to or equal to the air conditioner set temperature, and then it can be considered that the heating device does not need to assist in heating, so as to turn off the entire heating device.

[0065] Preferably, the control method of the heating device of the air conditioner system further includes: an active judgment step, in response to the heating signal sent by the remote controller / line controller of the air conditioner system, obtaining the current opening condition of the heating device. If the heating device is not turned on, the first opening judgment step S321 is executed. If the first heater is turned on and the second heater is not turned on, the second opening judgment step S322 and the second closing judgment step S324 are executed. If both the first heater and the second heater are turned on, the first closing judgment step S323 is executed. By receiving the heating signal of the remote controller / line controller, it is possible to directly enter the loop process without pre-judgment to judge whether it is necessary to turn on the heating device to assist in heating, so as to reduce redundant judgment steps and respond in a timely manner when the user needs to actively turn on the heating device.

[0066] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A control method for a heating device of an air conditioning system, the heating device comprising a two-stage heater composed of a first heater and a second heater, characterized in that, It includes the following steps: Ambient temperature detection step, detecting the initial indoor ambient temperature; Pre-judgment step, obtaining the air conditioner set temperature and the preset ambient temperature, comparing the initial indoor ambient temperature with the air conditioner set temperature, and comparing the initial indoor ambient temperature with the preset ambient temperature. If the initial indoor ambient temperature is less than the air conditioner set temperature and the initial indoor ambient temperature is not greater than the preset ambient temperature, enter the loop process. If not, return to the ambient temperature detection step. The loop process includes the following steps: Loop detection step, loop detecting the current indoor ambient temperature and the outlet air temperature of the indoor unit of the air conditioning system; Judgment step, providing a preset outlet air temperature, comparing the outlet air temperature with the preset outlet air temperature. If the outlet air temperature is not greater than the preset outlet air temperature, turn on the heating device. If the difference between the air conditioner set temperature and the current indoor ambient temperature is less than the minimum threshold or the outlet air temperature is not less than the preset outlet air temperature, turn off the heating device; First turn-on judgment step, when the first heater is off and the second heater is off, execute the first turn-on judgment step, obtaining the first preset outlet air temperature, comparing the outlet air temperature with the first preset outlet air temperature. If the outlet air temperature is not greater than the first preset outlet air temperature, turn on the first heater. If not, return to the loop detection step; Second turn-on judgment step, when the first heater is on and the second heater is off, execute the second turn-on judgment step, obtaining the second preset outlet air temperature, comparing the outlet air temperature with the second preset outlet air temperature, and calculating the difference between the current indoor ambient temperature and the air conditioner set temperature and the growth rate of the current indoor ambient temperature relative to the initial indoor ambient temperature over time. If all of the following are satisfied: the outlet air temperature is not greater than the second preset outlet air temperature, the difference between the current indoor ambient temperature and the air conditioner set temperature is not less than the first threshold, and the growth rate is not greater than the preset rate, turn on both the first heater and the second heater. If not, return to the loop detection step.

2. The control method of the heating device of the air conditioning system according to claim 1, wherein, The judgment step further includes the following sub-steps: First turn-off judgment step, when both the first heater and the second heater are on, execute the first turn-off judgment step, providing the maximum outlet air temperature, comparing the outlet air temperature with the maximum outlet air temperature, and calculating the difference between the current indoor ambient temperature and the air conditioner set temperature. If the outlet air temperature is not less than the maximum outlet air temperature, or the difference between the current indoor ambient temperature and the air conditioner set temperature is not greater than the second threshold, turn off the second heater. If not, return to the loop detection step; The second shutdown determination step: When the first heater is turned on, execute the second shutdown determination step. Calculate the difference between the current indoor ambient temperature and the air conditioner set temperature. If the difference between the current indoor ambient temperature and the air conditioner set temperature is not greater than the third threshold, turn off the first heater. If not satisfied, return to the loop detection step.

3. The control method of the heating device of the air conditioning system according to claim 2, characterized in that, The first threshold, the second threshold, and the third threshold decrease in sequence, and the third threshold is not greater than 0.

5.

4. The control method of the heating device of the air conditioning system according to claim 2, characterized in that, The first preset air outlet temperature, the second preset air outlet temperature, and the maximum air outlet temperature increase in sequence, and the maximum air outlet temperature is not greater than the minimum value of the protection temperature and the fusing temperature of the thermostat of the heating device.

5. The control method of the heating device of the air conditioning system according to claim 2, characterized in that, It further includes: The active determination step: In response to the heating signal sent by the remote controller / wired controller of the air conditioning system, Obtain the current opening status of the heating device. If the first heater is turned off and the second heater is turned off, execute the first opening determination step. If the first heater is turned on and the second heater is turned off, execute the second opening determination step and the second shutdown determination step. If both the first heater and the second heater are turned on, execute the first shutdown determination step.

6. An air conditioning system, characterized in that, It includes a two-stage heater composed of a first heater and a second heater, and can execute the control method of the heating device of the air conditioning system according to any one of claims 1-5. It further includes: A detection unit for detecting the indoor ambient temperature and the air outlet temperature; A judgment unit for generating a control instruction according to the detection result of the detection unit; A control unit for receiving the control instruction of the judgment unit and controlling the opening and closing of the heating device.

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