CN108332344B - Control method for partitioned air supply air conditioner and air conditioner - Google Patents
Control method for partitioned air supply air conditioner and air conditioner Download PDFInfo
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- CN108332344B CN108332344B CN201710623137.6A CN201710623137A CN108332344B CN 108332344 B CN108332344 B CN 108332344B CN 201710623137 A CN201710623137 A CN 201710623137A CN 108332344 B CN108332344 B CN 108332344B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
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Abstract
The control method of the air conditioner with the partitioned air supply comprises the steps that the air conditioner at least comprises at least two heat exchangers which are independently arranged, and the heat exchangers are respectively arranged in a shell which is arranged at intervals; the shell is provided with an air inlet and an air outlet, and the shell is also internally provided with a cross-flow fan; the air inlet, the heat exchanger, the cross-flow fan and the air outlet are sequentially arranged in the drainage air duct; a through-flow air duct is formed between the shells of the adjacent air conditioner bodies, and the flow guide air duct and the through air duct are mixed; each heat exchanger is provided with a coil temperature sensor; in the refrigeration mode, comparing the detection values of the coil temperature sensors, taking the lowest value, and calling the corresponding compressor operating frequency according to the lowest value; the highest value in the heating mode is used for calling the corresponding compressor running frequency; and controlling the air conditioner to run according to the running frequency of the compressor until the lowest value or the highest value belongs to a normal working set interval. Also comprises an air conditioner. Has the advantage of good air conditioning effect.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a control method of a partitioned air supply air conditioner and the air conditioner.
Background
In order to overcome the problems of complex air supply channel and large amount of noise and air quantity attenuation caused by the operation of the prior art air conditioner, the Chinese patent application (application No. 201410073610.4) discloses an air conditioner, wherein an air inlet is arranged on an independent shell, air channel structures of two air outlets form an air channel for inducing air along the front and back direction to drive the air to flow from back to front, and a cross-flow fan is respectively arranged in the two air channel structures.
The air conditioner provides softer air outlet, has better comfort level, and controls the two fans to synchronously run in the running process of the air conditioner. Although this air conditioner is improved in the duct structure of the indoor unit. The compressor operation frequency control is a frequency control mode which is continued to the common variable frequency air conditioner, the indoor unit receives an instruction from the remote controller, the temperature corresponding to the instruction of the remote controller is compared with the temperature measured by the room temperature sensor, the fuzzy controller infers the power supply frequency of the outdoor compressor, and the power supply frequency is transmitted to the outdoor through a communication circuit between the indoor unit and the outdoor unit to control the running speed of the compressor. However, different from the conventional inverter air conditioner, the air conditioner is provided with two heat exchangers, so that the heat load of each heat exchanger is different in the operation process, if the rotating speed of the compressor and other auxiliary equipment are controlled only according to the heat load of one heat exchanger as an early warning value, the input parameters have obvious deviation inevitably due to uneven closed-loop shunting between the two heat exchangers, further error operation of the air conditioner is caused, and if a plurality of heat exchangers are arranged, uneven closed-loop shunting is more obvious, and the air conditioning effect is seriously influenced.
Disclosure of Invention
The invention provides a control method of a partitioned air supply air conditioner, which aims to solve the problems that in the prior art, a double-through-flow air conditioner only controls the rotating speed of a compressor and other auxiliary equipment according to the heat load of one heat exchanger, so that misoperation of the air conditioner is easily caused, and the air conditioning effect is influenced.
A control method of a partitioned air supply air conditioner is characterized in that the air conditioner at least comprises at least two heat exchangers which are independently arranged, the heat exchangers are respectively arranged in a shell of an air conditioner body, and the shells of adjacent air conditioner bodies are arranged at intervals; the shell is provided with an air inlet and an air outlet, and a cross-flow fan is also arranged in the shell; a drainage air channel is formed in the shell, and the air inlet, the heat exchanger, the cross-flow fan and the air outlet are sequentially arranged in the drainage air channel along the air flowing direction; through air channels are formed between the shells of the adjacent air conditioner bodies, and the induced air of the two adjacent guide air channels and the air in the through air channels are mixed in the through air channels and sent to a specified area of an air-conditioning room; each heat exchanger is provided with a coil temperature sensor; the control method comprises the following steps:
if the air conditioner works in a refrigeration mode, comparing the detection values of the coil temperature sensors on each heat exchanger, taking the lowest value of the detection values of the coil temperature sensors, and looking up a table according to the lowest value to call the corresponding running frequency of the compressor; or if the air conditioner works in a heating mode, comparing the detection values of the coil temperature sensors on each heat exchanger, taking the highest value in the detection values of the coil temperature sensors, and calling the corresponding compressor running frequency according to the highest value lookup table; and controlling the air conditioner to run according to the running frequency of the compressor until the lowest value or the highest value belongs to a normal working set interval.
Further, if the air conditioner is operated in a cooling mode,
a coil temperature set value in the refrigeration mode is called, the coil temperature set value comprises an upper threshold and a lower threshold, and a plurality of numerical value intervals are divided between the upper threshold and the lower threshold; and determining a numerical value interval to which the lowest value belongs, and calling the corresponding compressor operating frequency according to the numerical value interval.
Furthermore, each value interval corresponds to a compressor operation frequency correction coefficient. And correcting the running frequency of the compressor by using the running frequency correction coefficient of the compressor, and controlling the compressor to run according to the corrected running frequency of the compressor.
Further, if the air conditioner operates in a heating mode, the control method includes the following stages:
a startup stage, in which the detection values of the coil temperature sensors are compared, the lowest value of the detection values of the coil temperature sensors is taken, the relationship between the coil temperature detection values and the running state of the cross-flow fan is called, and the running state of the cross-flow fan is determined according to the lowest value detected in real time;
the operation stage is that in the operation stage, the detection values of the coil temperature sensors are compared, the highest value of the detection values of the coil temperature sensors is taken, the coil temperature set value in the heating mode is obtained, the coil temperature set value comprises an upper limit threshold value and a lower limit threshold value, and a plurality of numerical value intervals are divided between the upper limit threshold value and the lower limit threshold value; and determining a numerical value interval to which the highest value belongs, and calling the corresponding compressor operating frequency according to the numerical value interval.
Furthermore, the starting-up stage has a fixed set period, when the fixed set period is over, the air conditioner exits the starting-up stage, and the cross-flow fan operates according to the setting of a user.
Furthermore, each numerical value interval corresponds to a compressor operation frequency correction coefficient, the compressor operation frequency is corrected by using the compressor operation frequency correction coefficient, and the compressor is controlled to operate according to the corrected compressor operation frequency.
Further, the control method further comprises an auxiliary heat control stage, wherein the auxiliary heat control stage comprises:
judging whether auxiliary heating operation is allowed or not, if so, judging whether the indoor environment temperature meets an environment temperature condition or not, if so, judging whether the temperature difference between the indoor environment temperature and the set temperature meets a temperature difference condition or not, if so, judging the operation state of the cross-flow fan, if so, comparing the detection values of the coil temperature sensors, taking the highest value in the detection values of the coil temperature sensors, and judging whether the highest value is greater than or equal to the auxiliary heating operation set temperature or not; and if the highest value is greater than or equal to the auxiliary heating operation set temperature, at least controlling the electric heating arranged in one of the shells to be started.
Further, after the electric heating is started, whether the maximum value is greater than or equal to the auxiliary heating operation protection temperature is judged; and if the highest value is greater than or equal to the auxiliary heating operation protection temperature or any one of the indoor environment temperature, the temperature difference and the operation state of the cross-flow fan does not meet the judgment condition, the electric heating is closed.
Further, a first delay exists between the auxiliary heating operation stage and the starting-up stage.
According to the control method of the partitioned air supply air conditioner, the temperatures detected by the first coil temperature sensor and the second coil temperature sensor are sampled and compared, the effective coil temperature detection value is used as an input variable, the frequency of the compressor and the starting, stopping and running states of various auxiliary devices are controlled, and the influence of uneven closed-loop shunting on the air conditioner is overcome. The method is particularly suitable for controlling the partitioned air supply air conditioner with a plurality of heat exchangers.
An air conditioner adopting the control method is also disclosed. The air conditioner at least comprises at least two heat exchangers which are independently arranged, the heat exchangers are respectively arranged in the shell of one air conditioner body, and the shells of the adjacent air conditioner bodies are arranged at intervals; the shell is provided with an air inlet and an air outlet, and a cross-flow fan is also arranged in the shell; a drainage air channel is formed in the shell, and the air inlet, the heat exchanger, the cross-flow fan and the air outlet are sequentially arranged in the drainage air channel along the air flowing direction; through air channels are formed between the shells of the adjacent air conditioner bodies, and the induced air of the two adjacent guide air channels and the air in the through air channels are mixed in the through air channels and sent to a specified area of an air-conditioning room; each heat exchanger is provided with a coil temperature sensor; the control method comprises the following steps:
if the air conditioner works in a refrigeration mode, comparing the detection values of the coil temperature sensors on each heat exchanger, taking the lowest value of the detection values of the coil temperature sensors, and looking up a table according to the lowest value to call the corresponding running frequency of the compressor; or if the air conditioner works in a heating mode, comparing the detection values of the coil temperature sensors on each heat exchanger, taking the highest value in the detection values of the coil temperature sensors, and calling the corresponding compressor running frequency according to the highest value lookup table; and controlling the air conditioner to run according to the running frequency of the compressor until the lowest value or the highest value belongs to a normal working set interval.
The air conditioner provided by the invention has the advantages of good air conditioning effect, flexible control mode and high comfort.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of an embodiment of a method for controlling a zoned air conditioner according to the present invention;
FIG. 2 is a flow chart of a cooling mode of the zoned air conditioner control method according to the present invention;
FIG. 3 is a flowchart illustrating a first embodiment of a heating mode of the zoned air conditioner control method according to the present invention;
FIG. 4 is a flow chart illustrating a second embodiment of a heating mode of the zoned air conditioner control method according to the present invention;
FIG. 5 is a sectional view of the zoned feed air conditioner in the control method shown in FIGS. 1 to 4;
FIG. 6 is a front view of the zoned feed air conditioner of FIG. 5;
FIG. 7 is a rear view of the zoned feed air conditioner of FIG. 5;
fig. 8 is an exploded view of the zoned air supply air conditioner shown in fig. 5.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 5 to 8, schematic diagrams of the zoned air conditioner according to the present invention are shown. As shown in the drawings, the zoned air-feeding air conditioner includes a base 500 and at least two air-conditioning bodies disposed on the base 500. It can be understood that the number of the air conditioner bodies can be more according to actual needs. The following takes two adjacent air conditioner bodies, i.e. a first air conditioner body 1 and a second air conditioner body 2 as shown in the figure, as an example, and specifically describes a specific structure of a zoned air supply air conditioner. The base 500 is enclosed by a base rear wall 9, base side walls 7, 8, a base front wall 6, and a chassis. Functional components 4 such as humidifying components are provided in the base 500. The first air conditioner body 1 includes a first casing 10 and a first air guide duct B1 formed in the first casing 10, and the second air conditioner body 2 includes a second casing 20 and a second air guide duct B2 formed in the second casing 20.
Structurally, unlike the prior art, the first casing 10 and the second casing 20 are independently spaced apart without interference therebetween. The first casing 10 comprises a first casing rear wall 10-1, a first casing top wall 10-2 and a first casing front wall 10-3, and the first casing rear wall 10-1, the first casing top wall 10-2 and the first casing front wall 10-3 are all designed to be streamlined. The second housing 20 includes a second housing rear wall 20-1, a second housing top wall 20-2, and a second housing front wall 20-3. The second housing top wall 20-2 and the second housing front wall 20-3 are streamlined. The first casing rear wall 10-1 is provided with a first air inlet 11, the first casing front wall 10-3 is provided with a first air outlet 14, and the first casing 10 is internally provided with a first cross flow fan 13 and a first heat exchanger 12. The first crossflow blower 13 includes a first crossflow blower fan 131 and a first crossflow blower motor 132, and the second crossflow blower 23 includes a second crossflow blower fan 231 and a second crossflow blower motor 232. The first through-flow fan motor 132 is disposed in the first housing top wall 10-2. The first air inlet 11, the first heat exchanger 12, the first through-flow fan 13, and the first air outlet 14 are sequentially arranged in the first air guide duct B1 along the air flowing direction. A second air outlet 24 is formed on the front wall of the second casing 20, a second air inlet 21 is formed on the rear wall 20-1 of the second casing, and a second cross-flow fan 23 and a second heat exchanger 22 are arranged in the second casing 20. Second crossflow blower motor 232 is disposed in second housing top wall 20-2. The second air inlet 21, the second heat exchanger 22, the second cross-flow fan 23 and the second air outlet 24 are sequentially arranged in the second air guide duct B2 along the air flowing direction. The first air conditioner body 1 and the second air conditioner body 2 are adjacently arranged, a through air duct A is formed between the first shell 10 and the second shell 20, the cross section shape of the through air duct A is limited through the streamline design of the first shell front wall 10-3, the first shell rear wall 10-1 and the first shell top wall 10-2 and the streamline design of the second shell front wall 20-3, the second shell rear wall 20-1 and the second shell top wall 20-2, and the flow rate and the flow direction of air in the through air duct A are further limited. The induced air in the first induced air duct B1 and the second induced air duct B2 and the air in the through air duct A are mixed in the through air duct. The through air duct a is preferably in the shape of a double horn which gradually expands from a tapered shape to a reduced shape and then gradually expands as shown in fig. 5. The converging preferably occurs between the first outlet 14 and the second outlet 24, i.e. through the middle section and the front end of the air duct a. The mixed air is sent to a designated area of the air-conditioned room.
In order to avoid the phenomenon of uneven flow distribution of the closed loop to cause the false shutdown or false alarm of the air conditioner, in the invention, a first coil temperature sensor 71 and a second coil temperature sensor 72 are respectively arranged on the first heat exchanger 12 and the second heat exchanger 22, wherein the first heat exchanger 12 and the second heat exchanger 22 are completely the same, and the arrangement positions of the first coil temperature sensor 71 and the second coil temperature sensor 72 are the same. After the air conditioner is in the on state, the first coil temperature sensor 71 and the second coil temperature sensor 72 return the first coil temperature detection value and the second coil temperature detection value in real time. If a plurality of air conditioning bodies are provided, one coil temperature sensor is provided for each heat exchanger in the air conditioning body.
Theoretically, if there is no closed-loop maldistribution between first heat exchanger 12 and second heat exchanger 22, then correspondingly, under actual operating conditions, the first coil temperature measurement and the second coil temperature measurement are the same, i.e., the thermal load of first heat exchanger 12 and second heat exchanger 22 under the same operating conditions is the same. In order to protect the refrigeration system and the compressor in the operation process, a group of coil temperature set values are set in the system, and the group of coil temperature set values comprise an upper limit threshold value, a lower limit threshold value and a normal work set interval. If the first coil pipe temperature detection value and the second coil pipe temperature detection value meet the set conditions of the coil pipe temperature set value, for example, the first coil pipe temperature detection value and the second coil pipe temperature detection value are higher than corresponding lower limit threshold values under the refrigeration working condition and belong to normal working set intervals, or the first coil pipe temperature detection value and the second coil pipe temperature detection value are lower than corresponding upper limit threshold values under the heating working condition and belong to normal working intervals, the pressure difference between the exhaust side and the suction side of the compressor is stable, ideal heating or refrigeration effects can be achieved by matching with the operation of other functional components, the compressor is not stopped before the ideal heating or refrigeration effects are achieved. And when the highest value exceeds the upper limit threshold value or the lowest value exceeds the lower limit threshold value, forming an alarm signal or controlling the compressor to stop.
However, for the zoned air-conditioning apparatus disclosed in the present invention, because there is an unavoidable phenomenon of closed-loop uneven distribution and the uneven distribution may be aggravated by the cooperation of other functional components, there is a significant difference in the thermal load of the first heat exchanger 12 and the second heat exchanger 22 under the same condition compared to the standard thermal load for the actual operating condition of the zoned air-conditioning apparatus disclosed in the present invention. Due to the differential thermal load, the first coil temperature sensor 71 and the second coil temperature sensor 72 have significantly different values during actual operation. Under standard experimental conditions, the relationship between the coil temperature sensor and the differential thermal load trend can be derived. In the cooling mode, if the deviation of the coil temperature detection value from the coil temperature set value in the normal cooling state is larger, the difference heat load is also gradually increased. In the heating mode, if the deviation between the actually detected coil temperature and the coil temperature set value in the normal heating state is large, the differential thermal load is also gradually increased. Since the heat load of the heat exchanger is equal to the cooling capacity of the compressor under the calculated condition and the power consumption of the compressor under the calculated condition, the operation frequency of the compressor needs to be controlled so as to suppress and correct the differential heat load. In order to suppress and correct the differential thermal load, the present embodiment obtains the relationship between the detected value of the coil temperature and the operating frequency of the compressor for suppressing the differential thermal load through a large amount of experimental data and stores the relationship in the form of a data table in the controller of the indoor unit of the air conditioner. After the detection value of the coil temperature sensor is received, the current compressor running frequency can be determined and corrected in a table look-up mode according to the coil temperature detection value, the air conditioner is controlled to run according to the corrected compressor running frequency until the coil temperature detection value belongs to a normal working set interval, the frequency of system alarm or compressor halt is reduced, and meanwhile the heating or refrigerating effect of the air conditioner is guaranteed.
As shown in fig. 1, specifically, in the control method disclosed in the present invention, if the air conditioner is operating in the cooling mode, the detection values of the first coil temperature sensor 71 and the second coil temperature sensor 72 are compared, and the lowest value among the detection values of the coil temperature sensors is taken. The method is also suitable for sampling a plurality of coil temperature sensors, and the lowest value of the plurality of coil temperature sensors is taken. The lowest value corresponds to a greater differential thermal load between the two heat exchangers in the cooling state. If the air conditioner is operated in the heating mode, the detection values of the first and second coil temperature sensors 71 and 72 are compared, and the highest value among the detection values of the coil temperature sensors is taken. The method is also suitable for sampling a plurality of coil temperature sensors, and the highest value of the plurality of coil temperature sensors is taken. The highest value corresponds to a greater differential thermal load between the two heat exchangers in the heating mode. If the air conditioner works in the heating mode, when the maximum value is gradually increased and deviates from the set value of the temperature of the coil, the difference heat load is also gradually increased and even exceeds the set threshold value. To suppress this trend, it is necessary to reduce the compressor operating frequency or to reduce the rate of increase of the compressor operating frequency so that the differential thermal load is kept in a reasonable interval or even eliminated completely. If the air conditioner is operated in the cooling mode, the differential thermal load is gradually increased as the minimum value is gradually decreased and further deviates from the set value of the temperature of the coil, and in order to suppress this tendency, it is also necessary to decrease the operating frequency of the compressor or to decrease the increasing speed of the operating frequency of the compressor so that the differential thermal load is kept in a reasonable interval or even eliminated. An optional mode is that the lowest value and the highest value are in one-to-one correspondence with the compressor frequency, after the lowest value or the highest value is received, the compressor operation frequency can be directly obtained through table lookup, and the air conditioner is controlled to operate according to the directly obtained compressor operation frequency until the lowest value or the highest value belongs to a normal operation set interval.
Referring to fig. 2, in actual operation, the operating frequency of the compressor is constantly changing. To increase the response speed for generating a corrected compressor operating frequency. In a preferred mode, when the air conditioner operates in the cooling mode, a set of coil temperature setting values for normal operation of the air conditioner in the cooling mode is first retrieved, where the coil temperature setting values include corresponding upper threshold and lower threshold. If the lowest value is higher than the lower limit threshold and lower than the upper limit threshold, the difference heat load is judged to belong to a controllable range interval, if the lowest value is higher than the upper limit threshold, the difference heat load is judged to belong to a normal working set interval, namely the lowest value belongs to the normal working set interval, and PID algorithm or fuzzy algorithm control is maintained. The upper threshold is preferably 10 deg.C, the lower threshold is preferably 0 deg.C, and the deviation is no more than 10%. It can be understood that the coil temperature set value may also be related to the type of the refrigerant, so that the upper threshold and the lower threshold are only preferred values, after the coil temperature sensor returns the minimum value in real time, if the differential thermal load belongs to a controllable range, the value range to which the minimum value belongs is determined, the compressor operation frequency corresponding to the value range is obtained according to the table lookup of the value range, and the air conditioner is controlled to operate according to the obtained compressor operation frequency until the minimum value is higher than the upper threshold, and belongs to the normal operation set range. In this many-to-one manner, the amount of data processing in the controller may be reduced.
A more preferable mode is described below, for example, if the interval in which the lowest value is located is the first interval, it is stated that the possibility of the occurrence of the differential thermal load starts to increase in the next sampling period, and the frequency-up rate of the compressor needs to be decreased, and the operating frequency correction coefficient is set to be +1Hz/10s corresponding to the allocation of the first interval, that is, the compressor is controlled to be slowly frequency-up at the rate of 1Hz per 10 seconds. If the interval in which the lowest value is located is the second interval, the probability that the difference heat load appears in the next sampling period tends to be stable, the real-time running frequency of the current compressor needs to be kept, the second interval is correspondingly allocated, the running frequency correction coefficient is set to be 0Hz/s, namely the compressor is controlled to run according to the current frequency, and the air conditioning effect is not sacrificed. If the interval in which the lowest value is located is the third interval, the air conditioning effect needs to be adjusted to control the difference heat load in the next sampling period, the third interval is correspondingly distributed to set the running frequency correction coefficient to be-1 Hz/10s, namely the compressor is controlled to slowly descend at the rate of 1Hz per 10 seconds; if the interval in which the lowest value is located is the fourth interval, the difference heat load is relatively large in the next sampling period, the frequency increasing rate of the compressor needs to be reduced rapidly, the compressor is prevented from entering shutdown protection, the operating frequency correction coefficient is set to be-1 Hz/s corresponding to the fourth interval, and the compressor is controlled to reduce the frequency rapidly according to the rate of 1Hz per second. Inevitably, the lowest sampling value is 0 ℃, that is, the lowest sampling value is equal to or less than the lower threshold, which indicates that in the next sampling period, the compressor needs to be shut down and protected, the compressor is shut down, and the normal operation is resumed after the compressor is shut down for 3 seconds.
The first interval is (ice _ temp _4, ice _ temp _ 3), the second interval is (ice _ temp _3, ice _ temp _ 2), the third interval is (ice _ temp _2, ice _ temp _ 1), the fourth interval is (ice _ temp _1, ice _ temp _ 0), wherein ice _ temp _0 is 0, and ice _ temp _4 is an upper threshold set to 10 ℃. And the ice _ temp _4, ice _ temp _3, ice _ temp _2, ice _ temp _1 and ice _ temp _0 are gradually decreased in an equant or non-equant manner.
As shown in fig. 3 and 4, if there is a significant differential thermal load in the air conditioning system, the operating states of other functional components will further increase the differential thermal load, and in the case of heating, the air conditioning effect will be significantly affected, or the service life of the functional components, such as the auxiliary electric heating, will be affected. To avoid this situation, as shown in fig. 3, the control method disclosed in the present invention includes at least a start-up phase and an operation phase if the air conditioner operates in the heating mode.
In the power-on phase, the detection values of the first coil temperature sensor 71 and the second coil temperature sensor 72 are compared, and the lowest value of the detection values of the coil temperature sensors is taken. The relation between the coil temperature detection value and the running state of the cross-flow fan is stored in the indoor unit of the air conditioner. Preferably, if the lowest value is less than 23 ℃, the first crossflow blower 13 and the second crossflow blower 23 are kept in a shutdown state, when the lowest value is greater than or equal to 23 ℃ and less than or equal to 37 ℃, the first crossflow blower 13 and the second crossflow blower 23 keep the minimum wind speed operation, until the lowest value is greater than or equal to 38 ℃, the first crossflow blower 13 and the second crossflow blower 23 receive an operation signal set by a user through an indoor unit of an air conditioner, and operate according to the set wind speed. The running states of the compressor, the first cross flow fan 13 and the second cross flow fan 23 are controlled to be stable in the starting-up stage, so that a large amount of low-temperature air is prevented from being sent into a room to reduce user experience. The startup phase has a fixed period, and after the startup phase is finished, the first cross flow fan 13 and the second cross flow fan 23 both operate according to the set wind speed corresponding to the operation signal set by the user no matter what the minimum value fed back in real time is, so that the actual experience of the user is ensured.
After exiting the starting stage, the air conditioner automatically enters the operation stage. And in the operation stage, comparing the detection values of the coil temperature sensors, taking the highest value in the detection values of the coil temperature sensors, and calling a group of coil temperature set values for normal work of the air conditioner in the heating mode. The coil temperature set point for normal operation includes a lower threshold of preferably 50 c and an upper threshold of preferably 70 c with a deviation of no more than 10%. And if the highest value is lower than the lower limit threshold, judging that the difference heat load belongs to a normal working set interval, namely, the highest value belongs to the normal working set interval, and maintaining PID algorithm or fuzzy algorithm control. And if the highest value is higher than the lower threshold and lower than the upper threshold, determining that the differential thermal load belongs to a controllable range interval. It will be appreciated that the coil temperature set point may also be related to the type of refrigerant, and therefore the lower and upper thresholds herein are merely preferred values. And further determining a value interval of the differential heat load according to the determination, and correcting the running frequency of the real-time compressor by using the running frequency of the corrected compressor corresponding to the value interval until the differential heat load meets a set interval of normal running conditions, namely the highest value belongs to the set interval of normal work. Similar to the cooling mode, the compressor operating frequency can be obtained by direct lookup in a one-to-one or many-to-one manner.
A more preferable mode is that if the interval in which the highest value is located is the first interval, the difference thermal load is larger, and the possibility of the shutdown protection of the compressor is higher; in order to avoid the compressor entering shutdown protection, the operation frequency correction coefficient is set to be-2 Hz/10s or-5 Hz/10s corresponding to the first interval, namely the compressor is controlled to rapidly reduce the frequency at the rate of 2Hz per ten seconds or 5Hz per ten seconds. If the interval in which the highest value is located is a second interval, the increase trend of the differential heat load is obvious, the running frequency of the compressor needs to be reduced, the correction coefficient of the running frequency corresponding to the second interval is set to be-1 Hz/5s, and the compressor is controlled to slowly decrease at the rate of 1Hz per 5 seconds; if the interval in which the highest value is located is a third interval, the difference thermal load tends to be stable, the operation frequency needs to be kept, and the operation frequency correction coefficient is set to be 0Hz/s corresponding to the third interval, namely the compressor is controlled to operate according to the current frequency; if the interval in which the highest value is located is a fourth interval, the trend that the difference heat load is about to increase is shown, the frequency rising rate of the compressor needs to be delayed, the operation frequency correction coefficient is set to be +1Hz/5s corresponding to the fourth interval, and the compressor is controlled to slowly rise at the rate of 1Hz per 5 seconds; if the interval in which the highest value is located is the fifth interval, the trend that the difference heat load is likely to increase is shown, the frequency increasing rate of the compressor needs to be properly reduced, the operation frequency correction coefficient is set to be +2Hz/10s or +5Hz/10s corresponding to the fifth interval, namely, the compressor is controlled to slowly increase according to the rate of 2Hz per 10 seconds or 5Hz per 10 seconds. If the sampled highest value is higher than the upper threshold, the compressor is firstly controlled to stop for 3 seconds, and the compressor is started after the highest value is lower than the lower threshold. The first interval is (ice _ temp _6, ice _ temp _ 5), the second interval is (ice _ temp _5, ice _ temp _ 4), the third interval is (ice _ temp _4, ice _ temp _ 3), the second interval is (ice _ temp _3, ice _ temp _ 2), the first interval is (ice _ temp _2, ice _ temp _ 1), wherein ice _ temp _1 is a lower threshold set to 50 ℃, and ice _ temp _6 is an upper threshold set to 70 ℃. ice _ temp _6, ice _ temp _5, ice _ temp _4, ice _ temp _3, ice _ temp _2, ice _ temp _1 are gradually decreased in an equal or unequal manner,
first and second electric heaters 81 and 82 are provided in the first and second casings respectively corresponding to the first and second crossflow blowers 13 and 23. And an auxiliary heating control stage is arranged in parallel with the starting stage and comprises a plurality of judgment conditions. It is first determined whether the allowable auxiliary heating operation is set. The setting permission signal is set by a user through a remote controller. The remaining steps can be performed only if allowed. And if the temperature difference between the indoor environment temperature and the set temperature meets the temperature difference condition, preferably, whether the temperature difference is greater than 2 ℃, if the temperature difference meets the temperature difference condition, judging the running state of the cross-flow fan, and allowing the electric heating to be started when the corresponding electric heating cross-flow fan is in the running state so as to avoid dry burning of the electric heating. If the auxiliary heating system is in operation, comparing the detection values of the coil temperature sensors, taking the highest value in the detection values of the coil temperature sensors, and judging whether the highest value is less than or equal to the auxiliary heating operation set temperature; and if the highest value is less than or equal to the auxiliary heating operation set temperature, controlling and setting at least one electric heating corresponding to the operation state to be started. The auxiliary heating operation set temperature is preferably 52 ℃.
After the electric heating is started, judging whether the highest value is greater than or equal to the auxiliary heating operation protection temperature; and if the highest value is greater than or equal to the auxiliary heating operation protection temperature or any one of the indoor environment temperature, the temperature difference and the operation state of the cross-flow fan does not meet the judgment condition, the electric heating is closed. The auxiliary heat operation protection temperature is preferably 57 ℃.
In principle, the auxiliary warm-up phase is completely synchronized in parallel with the boot-up phase. Preferably, a first delay exists between the auxiliary heating operation phase and the starting-up phase. The first delay is preferably set to 5 seconds to ensure that the crossflow blower can operate stably.
The invention also discloses a partitioned air supply air conditioner. The control method described in detail in the above embodiments is employed. The specific steps of the control method are described in detail in the detailed description and the depiction of the above embodiment and the drawings in the specification, and are not repeated herein. The zoned air supply air conditioner adopting the control method has the same technical effect.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A control method of a partitioned air supply air conditioner is characterized in that the air conditioner at least comprises at least two heat exchangers which are independently arranged, the heat exchangers are respectively arranged in a shell of an air conditioner body, and the shells of adjacent air conditioner bodies are arranged at intervals; the shell is provided with an air inlet and an air outlet, and a cross-flow fan is also arranged in the shell; a drainage air channel is formed in the shell, and the air inlet, the heat exchanger, the cross-flow fan and the air outlet are sequentially arranged in the drainage air channel along the air flowing direction; through air channels are formed between the shells of the adjacent air conditioner bodies, and the induced air of the two adjacent guide air channels and the air in the through air channels are mixed in the through air channels and sent to a specified area of an air-conditioning room; each heat exchanger is provided with a coil temperature sensor; the control method comprises the following steps:
if the air conditioner works in a refrigeration mode, comparing the detection values of the coil temperature sensors on each heat exchanger, taking the lowest value of the detection values of the coil temperature sensors, and looking up a table according to the lowest value to call the corresponding running frequency of the compressor; or if the air conditioner works in a heating mode, comparing the detection values of the coil temperature sensors on each heat exchanger, taking the highest value in the detection values of the coil temperature sensors, and calling the corresponding compressor running frequency according to the highest value lookup table; controlling the air conditioner to run according to the running frequency of the compressor until the lowest value or the highest value belongs to a normal working set interval;
if the air conditioner works in a heating mode, the control method comprises the following stages:
a startup stage, in which the detection values of the coil temperature sensors are compared, the lowest value of the detection values of the coil temperature sensors is taken, the relationship between the coil temperature detection values and the running state of the cross-flow fan is called, and the running state of the cross-flow fan is determined according to the lowest value detected in real time;
the operation stage is that in the operation stage, the detection values of the coil temperature sensors are compared, the highest value of the detection values of the coil temperature sensors is taken, the coil temperature set value in the heating mode is obtained, the coil temperature set value comprises an upper limit threshold value and a lower limit threshold value, and a plurality of numerical value intervals are divided between the upper limit threshold value and the lower limit threshold value; and determining a numerical value interval to which the highest value belongs, and calling the corresponding compressor operating frequency according to the numerical value interval.
2. The zone blowing air conditioner control method according to claim 1,
if the air conditioner is operated in the cooling mode,
a coil temperature set value in the refrigeration mode is called, the coil temperature set value comprises an upper threshold and a lower threshold, and a plurality of numerical value intervals are divided between the upper threshold and the lower threshold; and determining a numerical value interval to which the lowest value belongs, and calling the corresponding compressor operating frequency according to the numerical value interval.
3. The zoned air supply air conditioner control method according to claim 2, wherein each of the value sections corresponds to a compressor operation frequency correction coefficient; and correcting the running frequency of the compressor by using the running frequency correction coefficient of the compressor, and controlling the compressor to run according to the corrected running frequency of the compressor.
4. The method of claim 1, wherein the start-up phase has a fixed set period, the air conditioner exits the start-up phase when the fixed set period ends, and the crossflow blower operates according to user settings.
5. The method of claim 4, wherein each of the number ranges corresponds to a compressor operating frequency correction factor, the compressor operating frequency is corrected using the compressor operating frequency correction factor, and the compressor is controlled to operate at the corrected compressor operating frequency.
6. The method of controlling a zoned air conditioning unit as claimed in claim 5, further comprising an auxiliary heat control stage comprising:
judging whether auxiliary heating operation is allowed or not, if so, judging whether the indoor environment temperature meets an environment temperature condition or not, if so, judging whether the temperature difference between the indoor environment temperature and the set temperature meets a temperature difference condition or not, if so, judging the operation state of the cross-flow fan, if so, comparing the detection values of the coil temperature sensors, taking the highest value in the detection values of the coil temperature sensors, and judging whether the highest value is greater than or equal to the auxiliary heating operation set temperature or not; and if the highest value is greater than or equal to the auxiliary heating operation set temperature, at least controlling the electric heating arranged in one of the shells to be started.
7. The method of claim 6, wherein after the electrical heating is turned on, determining whether the maximum value is greater than or equal to an auxiliary heating operation protection temperature; and if the highest value is greater than or equal to the auxiliary heating operation protection temperature or any one of the indoor environment temperature, the temperature difference and the operation state of the cross-flow fan does not meet the judgment condition, the electric heating is closed.
8. The method of claim 7, wherein a first delay exists between the auxiliary warm-up phase and the startup phase.
9. An air conditioner characterized by adopting the method for controlling a zoned air conditioner according to any one of claims 1 to 8.
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| CN112212462B (en) * | 2020-09-21 | 2023-04-25 | 青岛海尔空调电子有限公司 | Air conditioner and control method thereof |
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