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CN104296310B - Control method and device for outlet air temperature of air conditioner indoor unit - Google Patents

Control method and device for outlet air temperature of air conditioner indoor unit Download PDF

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Publication number
CN104296310B
CN104296310B CN201310307353.1A CN201310307353A CN104296310B CN 104296310 B CN104296310 B CN 104296310B CN 201310307353 A CN201310307353 A CN 201310307353A CN 104296310 B CN104296310 B CN 104296310B
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temperature
air
heat exchanger
outlet
value
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CN104296310A (en
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黄剑云
赖想球
郭新生
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GD Midea Air Conditioning Equipment Co Ltd
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Guangdong Midea Refrigeration Equipment Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a control method and device for the outlet air temperature of an air conditioner indoor unit. The method comprises the first step of receiving a current heat exchanger temperature T2 (n) detected by a temperature sensor arranged in an indoor heat exchanger, and judging whether the absolute value of the difference value between T2 (n) and a heat exchanger temperature T2 (n-1) detected last time is smaller than a preset difference value extreme value D or not, the second step of judging whether T2 (n) is within a preset temperature interval corresponding to an air volume stable region when the inequation |T2 (n)-T2 (n-1)|＜D is satisfied, the third step of adjusting the outlet air volume of an air conditioner correspondingly according to the temperature interval corresponding to an air volume adjustment region where T2 (n) is located when T2 (n) is not within the temperature interval corresponding to the air volume stable region. By means of the method, a high outlet air temperature is reached quickly and kept constant, fluctuation of the indoor temperature and the outlet air temperature is reduced, the defect that the outlet air temperature of the air conditioner is low due to a low outdoor temperature is overcome, and the comfort level of users using the air conditioner is improved.

Description

Control method and device for air outlet temperature of indoor unit of air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for controlling the outlet air temperature of an indoor unit of an air conditioner.
Background
When the heat pump air conditioner operates in a heating mode, the refrigerant is evaporated in the outdoor heat exchanger, the heat exchange is carried out between the refrigerant and outdoor air through the heat exchanger, heat is absorbed from the outdoor air, the part of heat is brought into the indoor heat exchanger by the refrigerant, and the heat is released through the condensation process of the refrigerant in the indoor heat exchanger to heat the indoor air, so that people can enjoy a relatively comfortable environment.
Since the refrigerant needs to absorb heat from the outdoor air, when the outdoor temperature is gradually reduced, the heat exchange capacity of the outdoor heat exchanger is reduced, the evaporation pressure of the refrigerant is also reduced, and the capacity of the refrigerant for absorbing heat of the outdoor air is affected, so that the heat transferred to the indoor space is reduced. Because the air quantity of the indoor unit is constant, the reduction of the air outlet temperature can not be avoided even if the indoor return air temperature is kept constant, and when the air outlet temperature is reduced greatly, the temperature of air blown out from the air outlet is lower, so that the comfort of people can be seriously influenced. Even outdoor environment temperature is unchangeable, when outdoor environment temperature is lower, outdoor heat exchanger also has the process of frosting when heat pump air conditioner heats, and along with the thickening on frost layer, outdoor heat exchanger's heat transfer ability can also descend along with descending, and air-out temperature also can descend this moment, influences people's travelling comfort.
Disclosure of Invention
The invention mainly aims to provide a method and a device for controlling the outlet air temperature of an indoor unit of an air conditioner, which can reduce the fluctuation of the indoor temperature and the outlet air temperature, avoid the defect of low outlet air temperature of an outdoor low-temperature air conditioner and improve the use comfort of users.
The invention provides a method for controlling the outlet air temperature of an indoor unit of an air conditioner, which comprises the following steps:
receiving a current heat exchanger temperature T2(n) detected by a temperature sensor arranged in an indoor heat exchanger, and judging whether the absolute value of the difference between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is less than a preset difference extreme value D;
when the absolute value of T2(n) -T2(n-1) is more than or equal to D, the air conditioner operates normally without adjustment;
when the absolute value of T2(n) -T2(n-1) | < D, judging whether the current heat exchanger temperature T2(n) is in a temperature area corresponding to a preset air volume stabilizing area;
and when the current heat exchanger temperature T2(n) is not in the temperature zone corresponding to the preset air volume stabilizing zone, correspondingly adjusting the air volume according to the temperature zone corresponding to the air volume adjusting zone in which T2(n) is located so as to control the air temperature of the indoor unit of the air conditioner.
Preferably, before the step of determining whether the current heat exchanger temperature T2(n) is in the temperature interval corresponding to the preset air volume stable region, the method further includes:
and calculating a temperature stabilizing value T2S of the indoor heat exchanger corresponding to the stable air volume according to a preset air outlet temperature set value TcS, and determining a T2 temperature interval corresponding to the stable air volume area according to the T2S.
Preferably, the air volume adjusting area comprises an increasing area and a decreasing area;
when the current heat exchanger temperature T2(n) is smaller than the corresponding temperature minimum value of the air volume stabilizing zone, the current heat exchanger temperature T2(n) is in the air volume reduction zone;
and when the current heat exchanger temperature T2(n) is greater than or equal to the maximum corresponding temperature value of the air volume stabilizing zone, the current heat exchanger temperature T2(n) is in the air volume increasing zone.
Preferably, the step of correspondingly adjusting the air volume according to the air volume adjusting region in which T2(n) is located includes:
when the current heat exchanger temperature T2(n) is in a temperature interval corresponding to the air volume reduction area, reducing the air volume of the air conditioner air outlet according to a preset air volume reduction value;
and when the current heat exchanger temperature T2(n) is in a temperature range corresponding to the air volume increasing area, increasing the air outlet volume of the air conditioner according to a preset air volume increasing value.
Preferably, when T2(n) -T2(n-1) >0, the stabilizing region is [ T2S-T1, T2S + T2 ]; when T2(n) -T2(n-1) <0, the stable region is [ T2S-T3, T2S + T4 ]; wherein t1 > t3, and t2< t 4.
Preferably, before the step of receiving the current heat exchanger temperature T2(n) detected by the temperature sensor provided in the indoor heat exchanger, the method further comprises:
receiving a return air temperature T1 detected by a temperature sensor arranged at a return air inlet of the air conditioner, and judging whether the return air temperature T1 is in a preset indoor temperature area or not according to a preset indoor temperature set value TS; if yes, executing the step of judging whether the absolute value of the difference value between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is smaller than a preset difference value extreme value D; if not, the operation is normal and no adjustment is made.
The invention also provides a control device for the outlet air temperature of the indoor unit of the air conditioner, which comprises:
the indoor heat exchanger control system comprises a first receiving module, a second receiving module and a control module, wherein the first receiving module is used for receiving the current heat exchanger temperature T2(n) detected by a temperature sensor arranged in an indoor heat exchanger;
the first judgment module is used for judging whether the absolute value of the difference value between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is smaller than a preset difference value extreme value D or not;
the second judging module is used for judging whether the current heat exchanger temperature T2(n) is in a preset stable area or not when the absolute value of T2(n) -T2(n-1) | < D;
and the air volume adjusting module is used for correspondingly adjusting the air volume of the air conditioner outlet air according to the temperature interval corresponding to the air volume adjusting area in which the T2(n) is located when the current heat exchanger temperature T2(n) is not in the preset stable area so as to control the air outlet temperature of the indoor unit of the air conditioner.
Preferably, the control device for the outlet air temperature of the indoor unit of the air conditioner further comprises:
and the calculating and determining module is used for calculating a temperature stabilizing value T2S of the indoor heat exchanger corresponding to the stable air outlet quantity according to a preset air outlet temperature set value TcS, and determining a temperature interval corresponding to the air quantity stabilizing area according to the calculated stabilizing value T2S.
Preferably, the air volume adjusting area comprises an air volume increasing area and an air volume reducing area;
when the current heat exchanger temperature T2(n) is smaller than the minimum value of the temperature interval corresponding to the air volume stabilizing area, the current heat exchanger temperature T2(n) is in an air volume reduction area;
and when the current heat exchanger temperature T2(n) is greater than or equal to the maximum value of the temperature interval corresponding to the air volume stabilizing zone, the current heat exchanger temperature T2(n) is in the air volume increasing zone.
Preferably, the air volume adjusting module is specifically configured to:
when the current heat exchanger temperature T2(n) is in a temperature interval corresponding to the air volume reduction area, reducing the air volume of the air conditioner air outlet according to a preset air volume reduction value;
and when the current heat exchanger temperature T2(n) is in a temperature range corresponding to the air volume increasing area, increasing the air outlet volume of the air conditioner according to a preset air volume increasing value.
Preferably, when T2(n) -T2(n-1) >0, the stabilizing region is [ T2S-T1, T2S + T2 ]; when T2(n) -T2(n-1) <0, the stable region is [ T2S-T3, T2S + T4 ]; wherein t1 > t3, and t2< t 4.
Preferably, the control device for the outlet air temperature of the indoor unit of the air conditioner further comprises:
the second receiving module is used for receiving the return air temperature T1 detected by a temperature sensor arranged at an air outlet of the air conditioner;
and the third judgment module is used for judging whether the return air temperature T1 is in a preset indoor temperature area or not according to a preset indoor temperature set value TS.
After receiving the current heat exchanger temperature, judging whether the absolute value of the difference value between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is less than a preset difference value extreme value D; if yes, further judging whether the current heat exchanger temperature T2(n) is in a preset stable region; when the current heat exchanger temperature is not in the preset stable region, the air outlet volume is correspondingly adjusted according to the adjusting region where the current heat exchanger temperature T2(n) is located, so that the air outlet temperature of the indoor unit of the air conditioner is controlled, the purposes of quickly reaching the higher air outlet temperature and keeping the air outlet temperature constant are achieved, the fluctuation of the indoor temperature and the air outlet temperature is reduced, the defect of lower air outlet temperature of the air conditioner at low outdoor temperature is overcome, and the use comfort level of a user is improved.
Drawings
Fig. 1 is a schematic flow chart illustrating a method for controlling an outlet air temperature of an indoor unit of an air conditioner according to a first embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating the adjustment of the outlet air volume in the method for controlling the outlet air temperature of the indoor unit of the air conditioner according to the present invention;
fig. 3 is a schematic flow chart illustrating a method for controlling an outlet air temperature of an indoor unit of an air conditioner according to a second embodiment of the present invention;
fig. 4 is a schematic flow chart illustrating a method for controlling an outlet air temperature of an indoor unit of an air conditioner according to a third embodiment of the present invention;
fig. 5 is a schematic structural view of the control device for controlling the outlet air temperature of the indoor unit of the air conditioner according to the first embodiment of the present invention;
fig. 6 is a schematic structural view of a control device for controlling the outlet air temperature of an indoor unit of an air conditioner according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a control device for controlling the outlet air temperature of an indoor unit of an air conditioner according to a third embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a control method for the outlet air temperature of an indoor unit of an air conditioner. The temperature sensor arranged on the copper pipe elbow in the middle of the indoor heat exchanger of the air conditioner is used for detecting the current temperature of the heat exchanger, judging whether the air outlet volume is adjusted or not according to the current temperature of the heat exchanger, and carrying out corresponding operation according to the judgment result to realize the purpose of quickly reaching higher air outlet temperature and keeping constant.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for controlling an outlet air temperature of an indoor unit of an air conditioner according to a first embodiment of the present invention.
The method for controlling the outlet air temperature of the indoor unit of the air conditioner provided by the embodiment comprises the following steps:
a step S10 of receiving a current heat exchanger temperature T2(n) detected by a temperature sensor provided in the indoor heat exchanger;
step S11, judging whether the absolute value of the difference between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is less than a preset difference extreme value D;
in this embodiment, a temperature sensor disposed in the middle of an indoor heat exchanger of an air conditioner is used to periodically detect a current heat exchanger temperature T2(n), and after receiving the current heat exchanger temperature T2(n), it is determined whether an absolute value of a difference between the current heat exchanger temperature T2(n) and a last detected heat exchanger temperature T2(n-1) is less than a preset difference extreme value D, which can be set according to an actual situation, and if the absolute value of the difference between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is greater than or equal to the preset difference extreme value D, it indicates that the heat exchanger temperature has an excessively large change, and at this time, the air outlet volume of the indoor unit is not adjusted, so as to avoid large fluctuation in system operation.
Step S20, when | T2(n) -T2(n-1) | < D, judging whether the current heat exchanger temperature T2(n) is in a preset stable region;
and if the absolute value of the difference value between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is smaller than a preset difference value extreme value D, namely | T2(n) -T2(n-1) | < D, further judging whether the current heat exchanger temperature T2(n) is in a preset stable region. In this embodiment, the stable region means that when the current heat exchanger temperature T2(n) is within the interval range, the air outlet volume of the indoor unit is kept stable, and the air outlet volume is not adjusted.
And step S30, when the temperature T2(n) of the current heat exchanger is not in the preset stable region, correspondingly adjusting the air outlet volume according to the adjusting region where T2(n) is located so as to control the air outlet temperature of the indoor unit of the air conditioner.
In this embodiment, an adjustment area is further set corresponding to the stable area, that is, when the current heat exchanger temperature T2(n) is within the range of the adjustment area, the amount of outlet air is adjusted accordingly. The adjustment region comprises an increase region and a decrease region; when the current heat exchanger temperature T2(n) is smaller than the minimum value of the stable region, the current heat exchanger temperature T2(n) is in a reduction region, and the adjustment of the air outlet volume of the indoor unit corresponding to the current T2(n) is to reduce the air outlet volume; when the current heat exchanger temperature T2(n) is greater than or equal to the maximum value of the stable region, the current heat exchanger temperature T2(n) is in the increase region, and the adjustment of the air outlet volume of the indoor unit corresponding to T2(n) at this time is to increase the air outlet volume. When the current heat exchanger temperature T2(n) is in an upward trend and a downward trend compared to the last detected heat exchanger temperature T2(n-1), respective increasing zones and decreasing zones are provided. When the current heat exchanger temperature T2(n) is judged to be in the adjusting area, the air outlet volume is correspondingly increased and decreased according to the corresponding settings of the increasing area and the decreasing area, so that the air outlet temperature of the indoor unit of the air conditioner is further controlled.
Referring to fig. 2, fig. 2 is a schematic flow chart illustrating the adjustment of the outlet air volume in the method for controlling the outlet air temperature of the indoor unit of the air conditioner according to the present invention.
In this embodiment, step S30 specifically includes:
step S31, when the temperature T2(n) of the current heat exchanger is in a reduction area, the air outlet volume is reduced according to a preset air volume reduction value;
and step S31, when the temperature T2(n) of the current heat exchanger is in the increasing area, the air outlet volume is increased according to the preset air volume increasing value.
When it is judged that the current heat exchanger temperature T2(n) is within the adjustment zone range, it is further judged whether the current heat exchanger temperature T2(n) is in the decrease zone or the increase zone. At this time, the determination method is the same whether the current heat exchanger temperature T2(n) is in an upward trend or a downward trend compared with the last detected heat exchanger temperature T2 (n-1). If the current heat exchanger temperature T2(n) is smaller than the minimum value of the stable region, the current heat exchanger temperature T2(n) is in a reduction region, and at the moment, the air outlet volume is reduced according to a preset reduction value corresponding to the reduction region; if the current heat exchanger temperature T2(n) is larger than or equal to the maximum value of the stable region, the current heat exchanger temperature T2(n) is in an increasing region, and at the moment, the air outlet volume is increased according to a preset increasing value corresponding to the increasing region; the preset reduction value and the preset increase value are preset indicated values of the reduction or the increase of the air outlet volume, namely, the air outlet volume is reduced or increased by the magnitude of the indicated values according to the set indicated values.
In this embodiment, the reduction area and the increase area may be further subdivided, that is, the reduction area and the increase area are divided into a plurality of reduction areas and increase areas according to the current heat exchanger temperature T2(n), and a corresponding reduction value and an increase value are set for each of the reduction areas and the increase areas. And selecting a reduction area or an increase area where the heat exchanger is located according to the current temperature T2(n), and correspondingly adjusting the air outlet volume according to the corresponding reduction value or increase value.
In the embodiment, after the current heat exchanger temperature is received, whether the absolute value of the difference between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is smaller than a preset difference extreme value D is judged; if yes, further judging whether the current heat exchanger temperature T2(n) is in a preset stable region; when the current heat exchanger temperature is not in the preset stable region, the air outlet volume is correspondingly adjusted according to the adjusting region where the current heat exchanger temperature T2(n) is located, so that the air outlet temperature of the indoor unit of the air conditioner is controlled, the purposes of quickly reaching the higher air outlet temperature and keeping the air outlet temperature constant are achieved, the fluctuation of the indoor temperature and the air outlet temperature is reduced, the defect of lower air outlet temperature of the air conditioner at low outdoor temperature is overcome, and the use comfort level of a user is improved.
Referring to fig. 3, fig. 3 is a schematic flow chart illustrating a method for controlling an outlet air temperature of an indoor unit of an air conditioner according to a second embodiment of the present invention.
On the basis of the first embodiment of the method for controlling the outlet air temperature of the indoor unit of the air conditioner, before the step S20 is executed, the method further includes:
step S40, calculating a stable value T2S corresponding to the stable air outlet amount according to the preset air outlet temperature set value TcS, and determining a stable region according to the calculated stable value T2S.
In this embodiment, an outlet air temperature setting value TcS may be preset, the outlet air temperature setting value TcS may be set by a user, and a stable value T2S of the heat exchanger temperature corresponding to the stable outlet air volume may be calculated according to the outlet air temperature setting value TcS, that is, when the heat exchanger temperature is T2S, the outlet air volume of the indoor unit is the most stable. In this embodiment, the stable value T2S and the set value TcS of the outlet air temperature have the following relationship: T2S = ATcS + B, where a and B are constants, which are obtained according to actual measurement in a laboratory, and because the positions where the temperature sensors are installed in the indoor heat exchangers of the air conditioner and the heat exchange capacity of the indoor heat exchangers are different for different models during actual installation, the values of a and B are slightly different, which can be summarized according to actual data in the laboratory.
After the stable value T2S is calculated according to the set value TcS of the outlet air temperature, a stable region is determined according to the stable value T2S, in this embodiment, the minimum value of the stable region can be determined by T2S-TnThe maximum value of the stable region can be determined by T2S + TmTo determine where t isnAnd tmIs an appropriate error value, t, which can be set by usernAnd tmThe values of (a) may be the same or different,provided that T2S-T is guaranteed thereinnTo T2S + TmThe air outlet volume in the range of (1) is kept stable without adjustment. In this embodiment, T2(n) may be shown to be more elevated than T2(n-1), i.e., T2(n) -T2(n-1)>The stability region at 0 was set to [ T2S-T1, T2S + T2](ii) a The trend of T2(n) was downward compared with T2(n-1), namely T2(n) -T2(n-1)<The stability region at 0 was set to [ T2S-T3, T2S + T4]。
To avoid that the temperature rises too fast without increasing the outlet air volume in time when T2(n) is rising compared to T2(n-1) and is above the range of the stable region, and that the temperature drops too fast without decreasing the outlet air volume in time when T2(n) is falling compared to T2(n-1) and is below the range of the stable region, resulting in an uncomfortable experience for the user when the outlet air temperature is too high or too low, T1 > T3 is set, and T2< T4, that is, the minimum and maximum values of the stable region when T2(n) -T2(n-1) >0 are set to be smaller than the minimum and maximum values of the stable region when T2(n) -T2(n-1) < 0. Therefore, when T2(n) -T2(n-1) >0 and T2(n) is higher than the range of the stable region, the air outlet volume is increased earlier, so that the air outlet temperature can be prevented from being too high; when T2(n) -T2(n-1) <0 and T2(n) is lower than the range of the stable region, the air outlet volume is reduced earlier, so that the air outlet temperature can be prevented from being too low; and the fluctuation range of the outlet air temperature is reduced.
Before judging whether the current heat exchanger temperature T2(n) is in a stable region, firstly, a stable value T2S is calculated according to a preset air outlet temperature set value TcS, and the stable region is determined according to the stable value T2S, so that the premise guarantee is provided for achieving high air outlet temperature quickly, keeping the high air outlet temperature constant and reducing fluctuation of indoor temperature and air outlet temperature.
Referring to fig. 4, fig. 4 is a schematic flow chart illustrating a method for controlling an outlet air temperature of an indoor unit of an air conditioner according to a third embodiment of the present invention.
On the basis of the first and second embodiments of the method for controlling the outlet air temperature of the indoor unit of the air conditioner, before the step S10 is executed, the method further includes:
step S50, receiving the return air temperature T1 detected by a temperature sensor arranged at the air outlet of the air conditioner;
step S51, according to the preset indoor temperature set value TS, judging whether the return air temperature T1 is in the preset indoor temperature area; if yes, go to step S10; if not, the operation is normal and no adjustment is made.
In this embodiment, the return air temperature T1 at the return air inlet is detected by a temperature sensor provided at the return air inlet of the air conditioner. When the air conditioner is operated in a heating mode, after receiving the return air temperature T1, it is determined whether the return air temperature T1 is within the range of a preset indoor temperature zone. In this embodiment, the indoor temperature value that the room set by the user is expected to reach is defined as TS, and the indoor temperature zone is determined by TS-E, where E is a constant, and the value of E can also be set by the user. After receiving the return air temperature T1, judging whether the return air temperature is in the preset indoor temperature range according to the relation T1 which is not less than TS-E, judging whether the return air temperature is in the preset indoor temperature range or not because the outlet air temperature when the air conditioner system is started to operate in the heating mode is also lower when the indoor temperature is lower, and judging whether the return air temperature T1 is in the preset indoor temperature range or not at the moment, so that the outlet air volume is adjusted according to the temperature of the heat exchanger when the return air temperature T1 is close to the indoor temperature set value TS, thereby ensuring that the air conditioner system can still be put in with the maximum heating quantity when being started to operate in the heating mode, quickly raising the indoor temperature and reaching the indoor temperature set value required by.
The invention also provides a control device for the outlet air temperature of the indoor unit of the air conditioner.
Referring to fig. 5, fig. 5 is a schematic structural diagram of the control device for controlling the outlet air temperature of the indoor unit of the air conditioner according to the first embodiment of the present invention.
The controlling means of air conditioner indoor unit air-out temperature that this embodiment provided includes:
a first receiving module 10, configured to receive a current heat exchanger temperature T2(n) detected by a temperature sensor disposed in the indoor heat exchanger;
the first judging module 20 is configured to judge whether an absolute value of a difference between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is less than a preset difference extreme value D;
the second judging module 30 is used for judging whether the current heat exchanger temperature T2(n) is in a preset stable region or not when the absolute value of T2(n) -T2(n-1) | < D;
and the air volume adjusting module 40 is used for correspondingly adjusting the air outlet volume according to the adjusting area where the T2(n) is located when the current heat exchanger temperature T2(n) is not in the preset stable area so as to control the air outlet temperature of the indoor unit of the air conditioner.
In this embodiment, the current heat exchanger temperature T2(n) is periodically detected by a temperature sensor disposed in the middle of an indoor heat exchanger of an air conditioner, after the first receiving module 10 receives the current heat exchanger temperature T2(n), the first determining module 20 determines whether an absolute value of a difference between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is less than a preset difference extreme value D, which can be set according to an actual situation, if the absolute value of the difference between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is greater than or equal to the preset difference extreme value D, it indicates that the heat exchanger temperature changes too much, and at this time, the air outlet volume of the indoor unit is not adjusted, so as to avoid large fluctuation in system operation.
If the absolute value of the difference between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is less than the preset extreme value D of difference, i.e., | T2(n) -T2(n-1) | < D, the second determining module 30 further determines whether the current heat exchanger temperature T2(n) is in the preset stable region. In this embodiment, the stable region means that when the current heat exchanger temperature T2(n) is within the interval range, the air outlet volume of the indoor unit is kept stable, and the air outlet volume is not adjusted.
In this embodiment, an adjustment area is further set corresponding to the stable area, that is, when the current heat exchanger temperature T2(n) is within the range of the adjustment area, the air volume adjustment module 40 adjusts the air volume. The adjustment region comprises an increase region and a decrease region; when the current heat exchanger temperature T2(n) is smaller than the minimum value of the stable region, the current heat exchanger temperature T2(n) is in a reduction region, and the adjustment of the air outlet volume of the indoor unit corresponding to the current T2(n) is to reduce the air outlet volume; when the current heat exchanger temperature T2(n) is greater than or equal to the maximum value of the stable region, the current heat exchanger temperature T2(n) is in the increase region, and the adjustment of the air outlet volume of the indoor unit corresponding to T2(n) at this time is to increase the air outlet volume. When the current heat exchanger temperature T2(n) is in an upward trend and a downward trend compared to the last detected heat exchanger temperature T2(n-1), respective increasing zones and decreasing zones are provided. When the current heat exchanger temperature T2(n) is judged to be in the adjusting area, the air outlet volume is correspondingly reduced and increased according to the corresponding settings of the increasing area and the decreasing area, so that the air outlet temperature of the indoor unit of the air conditioner is further controlled.
In this embodiment, the air volume adjusting module 40 is specifically configured to:
when the temperature T2(n) of the current heat exchanger is in a reduction zone, reducing the air outlet volume according to a preset air volume reduction value;
when the temperature T2(n) of the current heat exchanger is in the increasing area, the air outlet volume is increased according to the preset air volume increasing value.
When it is judged that the current heat exchanger temperature T2(n) is within the adjustment zone range, it is further judged whether the current heat exchanger temperature T2(n) is in the decrease zone or the increase zone. At this time, the determination method is the same whether the current heat exchanger temperature T2(n) is in an upward trend or a downward trend compared with the last detected heat exchanger temperature T2 (n-1). If the current heat exchanger temperature T2(n) is smaller than the minimum value of the stable region, the current heat exchanger temperature T2(n) is in a reduction region, and at the moment, the air outlet volume is reduced according to a preset reduction value corresponding to the reduction region; if the current heat exchanger temperature T2(n) is larger than or equal to the maximum value of the stable region, the current heat exchanger temperature T2(n) is in an increasing region, and at the moment, the air outlet volume is increased according to a preset increasing value corresponding to the increasing region; the preset reduction value and the preset increase value are preset indicated values of the reduction or the increase of the air outlet volume, namely, the air outlet volume is reduced or increased by the magnitude of the indicated values according to the set indicated values.
In this embodiment, the reduction area and the increase area may be further subdivided, that is, the reduction area and the increase area are divided into a plurality of reduction areas and increase areas according to the current heat exchanger temperature T2(n), and a corresponding reduction value and an increase value are set for each of the reduction areas and the increase areas. And selecting a reduction area or an increase area where the heat exchanger is located according to the current temperature T2(n), and correspondingly adjusting the air outlet volume according to the corresponding reduction value or increase value.
In the embodiment, after the current heat exchanger temperature is received, whether the absolute value of the difference between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is smaller than a preset difference extreme value D is judged; if yes, further judging whether the current heat exchanger temperature T2(n) is in a preset stable region; when the current heat exchanger temperature is not in the preset stable region, the air outlet volume is correspondingly adjusted according to the adjusting region where the current heat exchanger temperature T2(n) is located, so that the air outlet temperature of the indoor unit of the air conditioner is controlled, the purposes of quickly reaching the higher air outlet temperature and keeping the air outlet temperature constant are achieved, the fluctuation of the indoor temperature and the air outlet temperature is reduced, the defect of lower air outlet temperature of the air conditioner at low outdoor temperature is overcome, and the use comfort level of a user is improved.
Referring to fig. 6, fig. 6 is a schematic structural view of a control device for controlling the outlet air temperature of an indoor unit of an air conditioner according to a second embodiment of the present invention.
On the basis of the first embodiment of the control device for the outlet air temperature of the indoor unit of the air conditioner, the device further comprises:
and the calculating and determining module 50 is configured to calculate a stable value T2S corresponding to the stable air outlet amount according to the preset air outlet temperature set value TcS, and determine a stable region according to the calculated stable value T2S.
In this embodiment, an outlet air temperature setting value TcS may be preset, the outlet air temperature setting value TcS may be set by a user, and the calculation and determination module 50 may calculate a stable value T2S of the heat exchanger temperature corresponding to the stable outlet air volume TcS, that is, when the heat exchanger temperature is T2S, the outlet air volume of the indoor unit is the most stable. In this embodiment, the stable value T2S and the set value TcS of the outlet air temperature have the following relationship: T2S = ATcS + B, where a and B are constants, which are obtained according to actual measurement in a laboratory, and because the positions where the temperature sensors are installed in the indoor heat exchangers of the air conditioner and the heat exchange capacity of the indoor heat exchangers are different for different models during actual installation, the values of a and B are slightly different, which can be summarized according to actual data in the laboratory.
After the stable value T2S is calculated according to the set value TcS of the outlet air temperature, a stable region is determined according to the stable value T2S, in this embodiment, the minimum value of the stable region can be determined by T2S-TnThe maximum value of the stable region can be determined by T2S + TmTo determine where t isnAnd tmIs an appropriate error value, t, which can be set by usernAnd tmMay be the same or different, provided that T2S-T is ensured herenTo T2S + TmThe air outlet volume in the range of (1) is kept stable without adjustment. In this embodiment, T2(n) may be shown to be more elevated than T2(n-1), i.e., T2(n) -T2(n-1)>The stability region at 0 was set to [ T2S-T1, T2S + T2](ii) a The trend of T2(n) was downward compared with T2(n-1), namely T2(n) -T2(n-1)<The stability region at 0 was set to [ T2S-T3, T2S + T4]。
To avoid that the temperature rises too fast without increasing the outlet air volume in time when T2(n) is rising compared to T2(n-1) and is above the range of the stable region, and that the temperature drops too fast without decreasing the outlet air volume in time when T2(n) is falling compared to T2(n-1) and is below the range of the stable region, resulting in an uncomfortable experience for the user when the outlet air temperature is too high or too low, T1 > T3 is set, and T2< T4, that is, the minimum and maximum values of the stable region when T2(n) -T2(n-1) >0 are set to be smaller than the minimum and maximum values of the stable region when T2(n) -T2(n-1) < 0. Therefore, when T2(n) -T2(n-1) >0 and T2(n) is higher than the range of the stable region, the air outlet volume is increased earlier, so that the air outlet temperature can be prevented from being too high; when T2(n) -T2(n-1) <0 and T2(n) is lower than the range of the stable region, the air outlet volume is reduced earlier, so that the air outlet temperature can be prevented from being too low; and the fluctuation range of the outlet air temperature is reduced.
Before judging whether the current heat exchanger temperature T2(n) is in a stable region, firstly, a stable value T2S is calculated according to a preset air outlet temperature set value TcS, and the stable region is determined according to the stable value T2S, so that the premise guarantee is provided for achieving high air outlet temperature quickly, keeping the high air outlet temperature constant and reducing fluctuation of indoor temperature and air outlet temperature.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a control device for controlling the outlet air temperature of an indoor unit of an air conditioner according to a third embodiment of the present invention.
On the basis of the first embodiment and the second embodiment of the control device for the outlet air temperature of the indoor unit of the air conditioner, the device further comprises:
a second receiving module 60, configured to receive a return air temperature T1 detected by a temperature sensor disposed at a return air inlet of the air conditioner;
and a third judging module 70, configured to judge whether the return air temperature T1 is in a preset indoor temperature zone according to the preset indoor temperature setting TS.
In this embodiment, the return air temperature T1 at the return air inlet is detected by a temperature sensor provided at the return air inlet of the air conditioner. When the air conditioner is operated in the heating mode, the second receiving module 60 receives the return air temperature T1, and then determines whether the return air temperature T1 is within the range of the preset indoor temperature zone by the third determining module 70. In this embodiment, the indoor temperature value that the room set by the user is expected to reach is defined as TS, and the indoor temperature zone is determined by TS-E, where E is a constant, and the value of E can also be set by the user. After receiving the return air temperature T1, judging whether the return air temperature is in the preset indoor temperature range according to the relation T1 which is not less than TS-E, judging whether the return air temperature is in the preset indoor temperature range or not because the outlet air temperature when the air conditioner system is started to operate in the heating mode is also lower when the indoor temperature is lower, and judging whether the return air temperature T1 is in the preset indoor temperature range or not at the moment, so that the outlet air volume is adjusted according to the temperature of the heat exchanger when the return air temperature T1 is close to the indoor temperature set value TS, thereby ensuring that the air conditioner system can still be put in with the maximum heating quantity when being started to operate in the heating mode, quickly raising the indoor temperature and reaching the indoor temperature set value required by.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.

Claims (11)

1. A control method for the outlet air temperature of an indoor unit of an air conditioner is characterized by comprising the following steps:
receiving a current heat exchanger temperature T2(n) detected by a temperature sensor arranged in an indoor heat exchanger, and judging whether the absolute value of the difference between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is less than a preset difference extreme value D;
when the absolute value of T2(n) -T2(n-1) is more than or equal to D, the air conditioner operates normally without adjustment;
when the absolute value of T2(n) -T2(n-1) | < D, judging whether the current heat exchanger temperature T2(n) is in a temperature area corresponding to a preset air volume stabilizing area;
when the current heat exchanger temperature T2(n) is not in the temperature zone corresponding to the preset air volume stable zone, the air volume of the outlet air is correspondingly adjusted according to the temperature zone corresponding to the air volume adjusting zone in which T2(n) is located so as to control the air temperature of the outlet air of the indoor unit of the air conditioner; wherein,
before the step of judging whether the current heat exchanger temperature T2(n) is in the temperature interval corresponding to the preset air volume stable region, the method further includes:
and calculating a temperature stabilizing value T2S of the indoor heat exchanger corresponding to the stable air outlet volume according to a preset air outlet temperature set value TcS, and determining a T2 temperature interval corresponding to the air volume stabilizing area according to the T2S.
2. The method for controlling the outlet air temperature of the indoor unit of an air conditioner according to claim 1, wherein the air volume adjusting area comprises an increasing area and a decreasing area;
when the current heat exchanger temperature T2(n) is smaller than the corresponding temperature minimum value of the air volume stabilizing zone, the current heat exchanger temperature T2(n) is in the air volume reduction zone;
and when the current heat exchanger temperature T2(n) is greater than or equal to the maximum corresponding temperature value of the air volume stabilizing zone, the current heat exchanger temperature T2(n) is in the air volume increasing zone.
3. The method for controlling the outlet air temperature of the indoor unit of the air conditioner as claimed in claim 2, wherein the step of correspondingly adjusting the outlet air volume according to the air volume adjusting region in which T2(n) is located comprises:
when the current heat exchanger temperature T2(n) is in a temperature interval corresponding to the air volume reduction area, reducing the air volume of the air conditioner air outlet according to a preset air volume reduction value;
and when the current heat exchanger temperature T2(n) is in a temperature range corresponding to the air volume increasing area, increasing the air outlet volume of the air conditioner according to a preset air volume increasing value.
4. The method for controlling the outlet air temperature of the indoor unit of an air conditioner as claimed in claim 1, wherein when T2(n) -T2(n-1) >0, the stable region is [ T2S-T1, T2S + T2 ]; when T2(n) -T2(n-1) <0, the stable region is [ T2S-T3, T2S + T4 ]; wherein t1 > t3, and t2< t 4.
5. The method for controlling the outlet air temperature of the indoor unit of the air conditioner as claimed in any one of claims 1 to 4, wherein before the step of receiving the current heat exchanger temperature T2(n) detected by the temperature sensor arranged in the indoor heat exchanger, the method further comprises:
receiving a return air temperature T1 detected by a temperature sensor arranged at a return air inlet of the air conditioner, and judging whether the return air temperature T1 is in a preset indoor temperature area or not according to a preset indoor temperature set value TS; if yes, executing the step of judging whether the absolute value of the difference value between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is smaller than a preset difference value extreme value D; if not, the operation is normal and no adjustment is made.
6. The utility model provides a controlling means of air-conditioner indoor unit air-out temperature which characterized in that includes:
the indoor heat exchanger control system comprises a first receiving module, a second receiving module and a control module, wherein the first receiving module is used for receiving the current heat exchanger temperature T2(n) detected by a temperature sensor arranged in an indoor heat exchanger;
the first judgment module is used for judging whether the absolute value of the difference value between the current heat exchanger temperature T2(n) and the last detected heat exchanger temperature T2(n-1) is smaller than a preset difference value extreme value D or not;
the second judging module is used for judging whether the current heat exchanger temperature T2(n) is in a preset stable area or not when the absolute value of T2(n) -T2(n-1) | < D;
and the air volume adjusting module is used for correspondingly adjusting the air volume of the air conditioner outlet air according to the temperature interval corresponding to the air volume adjusting area in which the T2(n) is located when the current heat exchanger temperature T2(n) is not in the preset stable area so as to control the air outlet temperature of the indoor unit of the air conditioner.
7. The device for controlling the outlet air temperature of the indoor unit of the air conditioner as claimed in claim 6, further comprising:
and the calculating and determining module is used for calculating a temperature stabilizing value T2S of the indoor heat exchanger corresponding to the stable air outlet quantity according to a preset air outlet temperature set value TcS, and determining a temperature interval corresponding to the air quantity stabilizing area according to the calculated stabilizing value T2S.
8. The control device for the outlet air temperature of the indoor unit of the air conditioner as claimed in claim 7, wherein the air volume adjusting area comprises an air volume increasing area and an air volume decreasing area;
when the current heat exchanger temperature T2(n) is smaller than the minimum value of the temperature interval corresponding to the air volume stabilizing area, the current heat exchanger temperature T2(n) is in an air volume reduction area;
and when the current heat exchanger temperature T2(n) is greater than or equal to the maximum value of the temperature interval corresponding to the air volume stabilizing zone, the current heat exchanger temperature T2(n) is in the air volume increasing zone.
9. The device for controlling the outlet air temperature of the indoor unit of the air conditioner according to claim 8, wherein the air volume adjusting module is specifically configured to:
when the current heat exchanger temperature T2(n) is in a temperature interval corresponding to the air volume reduction area, reducing the air volume of the air conditioner air outlet according to a preset air volume reduction value;
and when the current heat exchanger temperature T2(n) is in a temperature range corresponding to the air volume increasing area, increasing the air outlet volume of the air conditioner according to a preset air volume increasing value.
10. The device for controlling the outlet air temperature of the indoor unit of an air conditioner as claimed in claim 7, wherein when T2(n) -T2(n-1) >0, the stable region is [ T2S-T1, T2S + T2 ]; when T2(n) -T2(n-1) <0, the stable region is [ T2S-T3, T2S + T4 ]; wherein t1 > t3, and t2< t 4.
11. The device for controlling the outlet air temperature of the indoor unit of the air conditioner as claimed in any one of claims 6 to 10, further comprising:
the second receiving module is used for receiving the return air temperature T1 detected by a temperature sensor arranged at the return air inlet of the air conditioner;
and the third judgment module is used for judging whether the return air temperature T1 is in a preset indoor temperature area or not according to a preset indoor temperature set value TS.
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