CN107514743B - Air conditioner control method and device and air conditioner - Google Patents

Air conditioner control method and device and air conditioner Download PDF

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Publication number
CN107514743B
CN107514743B CN201710623136.1A CN201710623136A CN107514743B CN 107514743 B CN107514743 B CN 107514743B CN 201710623136 A CN201710623136 A CN 201710623136A CN 107514743 B CN107514743 B CN 107514743B
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air conditioner
wind speed
frequency
fan
differential
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CN107514743A (en
Inventor
王伟锋
矫立涛
常利华
冯景学
邱洪刚
张一�
金锦花
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Zhijia Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Zhijia Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007Indoor units, e.g. fan coil units
    • F24F1/0018Indoor units, e.g. fan coil units characterised by fans
    • F24F1/0033Indoor units, e.g. fan coil units characterised by fans having two or more fans

Abstract

The invention provides a control method of an air conditioner, wherein the air conditioner at least comprises a first fan and a second fan, and the control method comprises the following steps: a user sets the first fan to operate according to a first set wind speed, and sets the second fan to operate according to a second set wind speed; if the first set wind speed and the second set wind speed are not equal, and the first set wind speed and the second set wind speed are not equal to zero, the air conditioner enters a differential control mode; calling a corresponding first set operation frequency according to the first set wind speed, calling a corresponding second set operation frequency according to the second set wind speed, calculating a differential operation frequency and controlling a compressor to operate according to the differential operation frequency; wherein the differential operating frequency is equal to an average of the first set operating frequency and the second set operating frequency. An air conditioner control device and an air conditioner are also disclosed. The invention has the advantages of good air conditioning effect, flexible control mode and high comfort.

Description

Air conditioner control method and device and air conditioner
Technical Field
The invention relates to the technical field of air conditioning, in particular to an air conditioner control method, a control device and an air conditioner.
Background
In order to solve the problems of complex air supply channel and large amount of noise and air quantity attenuation caused by the operation of the air conditioner in the prior art, the Chinese patent application (application number 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-back direction to drive the air to flow from back to front, and a 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. The problem that this exists is that, if the refrigerating output that the user demand is less, can only control two fans and move according to the low wind state simultaneously, control compressor low frequency operation simultaneously, although the energy consumption of this kind of control mode descends, the refrigeration effect also worsens simultaneously, appears the condition of repetition rate of rise and fall easily, causes the room temperature fluctuation great. Further optimization and improvement of this type of air conditioner are also ongoing in the prior art. For example, as disclosed in chinese patent application (application No. 201510485974.8), referring to the specification, "the wind speeds of the first fan and the second fan are determined according to the air volume required for heat exchange of the dual cross-flow air conditioner", in this control mode, the first fan and the second fan can operate at different wind speeds, but the wind speeds cannot be actively controlled by a user, the operation frequency of the compressor must be collected first, the required air volume is pushed back according to the operation frequency of the compressor, and the operating gear of the fan is calculated according to the air volume. Firstly, a user cannot actively adjust the wind speed of the fan according to actual feeling, and secondly, the feedback adjustment of the wind speed according to the actual running frequency of the compressor has obvious hysteresis and influences user experience; thirdly, the compressor operating frequency is not adjusted with the operation of the fan. Therefore, in the process of adjusting the rear air speed, the conditions that the running frequency of the compressor is high, the running speed of the fan is low, or the running frequency of the compressor is low and the running speed of the fan is high are not matched exist, the effect of the air conditioner is obviously affected, unnecessary energy waste is caused, and the frosting problem of the heat exchanger is solved.
In summary, the dual cross-flow air conditioner in the prior art has a single control mode, and cannot meet the personalized requirements of users.
Disclosure of Invention
The invention provides an air conditioner control method, which aims to solve the problem that a double-through-flow air conditioner in the prior art has a single control mode and cannot meet the personalized requirements of users.
A control method of an air conditioner, the air conditioner at least comprises a first fan and a second fan, the control method comprises the following steps:
a user sets the first fan to operate according to a first set wind speed, and sets the second fan to operate according to a second set wind speed; if the first set wind speed and the second set wind speed are not equal, and the first set wind speed and the second set wind speed are not equal to zero, the air conditioner enters a differential control mode;
calling a corresponding first set operation frequency according to the first set wind speed, calling a corresponding second set operation frequency according to the second set wind speed, calculating a differential operation frequency and controlling a compressor to operate according to the differential operation frequency; wherein the differential operating frequency is equal to an average of the first set operating frequency and the second set operating frequency.
Further, after the air conditioner enters a differential control mode, whether the temperature difference between the set temperature and the indoor temperature belongs to a first threshold interval or not is judged, and if the temperature difference belongs to the first threshold interval, the differential operation frequency is calculated and the compressor is controlled to operate according to the differential operation frequency.
Further, after the air conditioner enters a differential speed control mode, if the temperature difference between the set temperature and the indoor temperature does not belong to a first threshold interval and belongs to a second threshold interval, calculating the target frequency of the compressor according to a PID algorithm and controlling the compressor to operate to the target frequency; the first threshold interval and the second threshold interval are continuous, and the lower threshold of the first threshold interval is equal to the upper threshold of the second threshold interval.
Furthermore, a first electronic expansion valve is arranged on a refrigerant pipeline of the first heat exchanger corresponding to the first fan, and a second electronic expansion valve is arranged on a refrigerant pipeline of the second heat exchanger corresponding to the second fan; after the air conditioner enters a differential control mode, if the temperature difference belongs to a first threshold value interval, controlling the compressor to operate according to the differential operation frequency, wherein the opening degree of the first electronic expansion valve is reduced along with the reduction of the wind speed of the first fan, and the opening degree of the second electronic expansion valve is reduced along with the reduction of the wind speed of the second fan; the first electronic expansion valve and the second electronic expansion valve are kept in an open valve state.
Further, the control method further comprises the following steps:
if the first set wind speed is equal to the second set wind speed and the first set wind speed and the second set wind speed are both the highest wind speed, the air conditioner enters a constant speed control mode;
the air conditioner controller stores the corresponding relation between the outdoor environment temperature and the compressor running frequency in a constant speed control mode;
the air conditioner controller samples real-time outdoor environment temperature, calls corresponding set compressor running frequency according to the real-time outdoor environment temperature, and controls the compressor to run according to the set compressor running frequency; the first electronic expansion valve and the second electronic expansion valve are kept in a fully open state.
Further, in the constant speed control mode, the outdoor environment temperature is divided into a plurality of intervals, each interval corresponds to a compressor operation frequency set value, and when the real-time outdoor environment temperature matches any one interval, the corresponding compressor operation frequency set value is executed.
Further, a first coil temperature sensor is arranged on the first heat exchanger, and a second coil temperature sensor is arranged on the second heat exchanger; sampling first coil pipe temperature that first coil pipe temperature sensor detected, and the second coil pipe temperature that second coil pipe temperature sensor detected, according to the operation mode sample of air conditioner first coil pipe temperature and second coil pipe temperature's lower value or higher value are as early warning coil pipe temperature, work as early warning coil pipe temperature is when exceeding the settlement threshold value, output alarm signal.
Furthermore, the first coil temperature sensor and the second coil temperature sensor are respectively arranged in the middle of the branch pipe with the lowest outlet air temperature of the first heat exchanger and the second heat exchanger.
The air conditioner control method disclosed by the invention can greatly improve the starting characteristic and the variable load dynamic characteristic of a refrigerating system in the air conditioner, can adjust the fan and the compressor to form an optimized control strategy, quickly responds to the flexible requirement of a user on the cooling capacity of an air-conditioning room, and further ensures that the heat exchanger has high use efficiency, stable operation, low energy consumption and good temperature control precision.
The air conditioner comprises a first fan and a second fan; the control device includes:
a differential determination unit for determining whether or not the wind speed of the first fan and the wind speed of the second fan satisfy a control condition of a differential control mode; the control condition of the differential speed control mode is that the first set wind speed and the second set wind speed are not equal, and the first set wind speed and the second set wind speed are not equal to zero;
the compressor frequency determining unit is used for calling a corresponding first set running frequency according to the first set wind speed, calling a corresponding second set running frequency according to the second set wind speed, calculating the differential running frequency and controlling the compressor to run according to the differential running frequency after entering the differential control mode; wherein the differential operating frequency is equal to an average of the first set operating frequency and the second set operating frequency.
The air conditioner control device disclosed by the invention has the characteristics of flexible control strategy and high response speed.
Meanwhile, the air conditioner adopts the following air conditioner control method:
the air conditioner at least comprises a first fan and a second fan, and the control method comprises the following steps:
a user sets the first fan to operate according to a first set wind speed, and sets the second fan to operate according to a second set wind speed; if the first set wind speed and the second set wind speed are not equal, and the first set wind speed and the second set wind speed are not equal to zero, the air conditioner enters a differential control mode;
calling a corresponding first set operation frequency according to the first set wind speed, calling a corresponding second set operation frequency according to the second set wind speed, calculating a differential operation frequency and controlling a compressor to operate according to the differential operation frequency; wherein the differential operating frequency is equal to an average of the first set operating frequency and the second set operating frequency.
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 illustrating a first embodiment of a method for controlling an air conditioner according to the present invention;
FIG. 2 is a flowchart illustrating a second embodiment of a method for controlling an air conditioner according to the present invention;
FIG. 3 is a flow chart illustrating a third embodiment of a method for controlling an air conditioner according to the present invention;
FIG. 4 is a block diagram schematically illustrating the structure of an embodiment of the control apparatus for an air conditioner according to the present invention;
FIG. 5 is a schematic structural diagram of an air conditioner according to the present disclosure;
fig. 6 is a schematic view of an internal structure of the 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.
The air conditioner comprises an indoor unit and an outdoor unit, wherein the indoor unit and the outdoor unit are connected through an online pipe to realize the circulation of a refrigerant, and the indoor unit and the outdoor unit realize power supply and communication through an online line. An outdoor ambient temperature sensor (not shown) is preferably provided on the outdoor side. As shown in fig. 5 and 6, the indoor unit of an air conditioner preferably includes a base 11 and two air conditioning bodies disposed on the base 11. Air intake and air outlet have all been seted up on each air conditioner body, all are provided with a fan in each air conditioner body, first fan 2 and second fan 5 promptly, and first fan 2 and second fan 5 are through independent circuit control, each other do not influence. The first fan 2 and the second fan 5 are preferably cross-flow fans for guiding air from the corresponding air inlets to the air outlets. A first heat exchanger 1 is provided in the first air conditioning body 8 in correspondence with the first fan 2, and a second heat exchanger 4 is provided in the second air conditioning body 9 in correspondence with the second fan 5. A through air duct 10 is formed between the adjacent first air conditioner body 8 and the second air conditioner body 9. The air outlets of the first air conditioner body 8 and the second air conditioner body 9 are positioned in the through air duct 10. When the first fan 2 and/or the second fan 5 operate, air flows into the through air duct 10 from the air outlet of the first air conditioner body 8 and/or the air outlet of the second air conditioner body 9 through the first heat exchanger 1 and/or the second heat exchanger 4 in the first air conditioner body 8 and the second air conditioner body 9, negative pressure is formed between the air outlet of the first air conditioner body 8 and the air outlet of the second air conditioner body 9 under the action of the cross-flow fan, air around the air conditioner bodies is introduced into the through air duct 10, and mixed flow is achieved in the through air duct 10, so that air supply comfort is improved. In the air conditioner disclosed by the invention, because the first fan 2 and the second fan 5 are controlled by independent circuits, an independent key is arranged on a control device of the air conditioner, the start and stop of the first fan 2 and the second fan 5 and the wind speeds of the first fan 2 and the second fan 5 can be independently controlled, and meanwhile, the states of the air outlets of the first air conditioner body 8 and the second air conditioner body 9 can be independently controlled. The air supply of the first air conditioner body 8 and the second air conditioner body 9 in different areas is realized. The control device includes but is not limited to one or more of an infrared remote controller, an air conditioner control panel, a smart phone, a tablet computer and a wearable device.
Referring to fig. 1, a flow chart of a first embodiment of the air conditioner control method according to the present invention is shown. As shown in fig. 1, the air conditioner control method disclosed in the present embodiment includes the steps of:
s101, the air conditioner is in an operation stage. The user can set the wind speeds of the first fan and the second fan which operate independently through the control device. And the user sets the first fan to operate according to a first set wind speed, and sets the second fan to operate according to a second set wind speed. The user can arbitrarily set the first set wind speed and the second set wind speed through the remote controller. Preferably, the first set wind speed and the second set wind speed are divided into five steps, i.e., strong, high wind, medium wind, low wind, and quiet. The first fan and the second fan can be operated according to different gears according to the requirements of users.
And S102, receiving the first set wind speed and the second set wind speed fed back by the control device and comparing the first set wind speed and the second set wind speed by the air conditioner controller, preferably a control chip of an air conditioner indoor unit. If the first set wind speed and the second set wind speed are not equal, and the first set wind speed and the second set wind speed are not equal to zero, the air conditioner enters a differential speed air supply mode.
And S103, after entering a differential air supply mode, synchronously adjusting the refrigerating capacity of the air conditioner according to different first set air speed and second set air speed. The air conditioner controller stores therein a corresponding compressor operating frequency corresponding to each set wind speed. Preferably, there is a corresponding compressor operating frequency for each set wind speed, or a corresponding compressor operating frequency for each set wind speed. The air conditioner controller calls a corresponding first set operation frequency in a corresponding storage unit according to the first set wind speed, and calls a corresponding second set operation frequency in a corresponding storage unit according to the second set wind speed.
And S104, calculating a differential operation frequency by the air conditioner controller and controlling the compressor to operate according to the differential operation frequency, wherein the differential operation frequency is equal to the average value of the first set operation frequency and the second set operation frequency. It can be understood that, for the air conditioner, another alternative embodiment is to provide more air conditioner bodies, and to provide one fan capable of operating independently in each air conditioner body, and to provide the compressor operating frequency corresponding to the set wind speed of each fan. For this embodiment, the differential operating frequency is equal to the average of a plurality of set operating frequencies.
For example, the control device may be an infrared remote controller, and two independent keys are arranged on the infrared remote controller and are respectively used for controlling the wind speeds of the first fan and the second fan. Taking the direction facing the air conditioner as an example, as shown in fig. 5 and 6, the left side is a first air conditioner body, the right side is a second air conditioner body, and the through air duct is formed between the first air conditioner body and the second air conditioner body. If in a certain situation the user on the left side with respect to the air conditioner feels cold, the user on the right side with respect to the air conditioner feels comfortable or hot. Namely, the first fan can be set to operate according to a low wind gear through the infrared remote controller, the second fan is set to operate according to a high wind gear, and the air conditioner controller is automatically triggered to enter a differential control mode. The air conditioner controller respectively calls the set operating frequency corresponding to the wind speed value stored in the storage unit according to the sampled set wind speed values (the high wind speed is about 1000-. When the 'low wind' or the corresponding wind speed value is set, the first set operation frequency can be selected within the numerical range of 30-45Hz, and when the 'high wind' or the corresponding wind speed value is set, the second set operation frequency can be selected within the numerical range of 63-80 Hz. The preferred wind speed steps, wind speed, and compressor operating frequency are stored in a one-to-one correspondence in the form of a data table in a storage unit of the air conditioner controller. And calculating the average value of the first set operation frequency and the second set operation frequency, and controlling the compressor to operate according to the differential operation frequency by taking the average value of the first set operation frequency and the second set operation frequency as the differential operation frequency. If the capacity of the air conditioner is 3, the capacity of 1.5 can be exerted under the control method, and the actual requirement of a user is met.
As shown in fig. 2, which is a second specific embodiment of the control method provided by the present invention, it can be understood that the actual demand of the user for the air conditioner varies with the variation of the air conditioning load, and the refrigeration cycle of the air conditioner has the characteristics of large hysteresis and nonlinearity. Therefore, in the present embodiment, it is preferable to combine the actual demand of the user and the air conditioning load in the differential speed control mode to form an optimal control strategy.
The first two steps S201 and S202 of this embodiment are the same as those of the first embodiment, and are not described herein again.
The control strategy includes a plurality of phases. After the air conditioner enters the differential mode, it is first determined whether the temperature difference between the set temperature and the indoor temperature belongs to the first threshold interval (step S203 shown in fig. 2). If the temperature difference belongs to the first threshold interval, the first set operating frequency and the second set operating frequency are called (step S2041 shown in fig. 2), the differential operating frequency is calculated, and the compressor is controlled to operate according to the differential operating frequency (step S205 shown in fig. 2). The first threshold interval is preferably set to be greater than 3 deg.c. Under the conditions of the temperature difference and the wind speed, the refrigerating capacity required by a user is small, a certain deviation exists between the set temperature and the indoor temperature, and the temperature difference belongs to a large range. In the second phase, the temperature difference deviates from the first threshold interval after a period of operation at the differential operating frequency. If the temperature difference does not belong to the first threshold interval and the second threshold interval, calculating the target frequency of the compressor according to the PID algorithm and controlling the compressor to operate to the target frequency (step S2042 shown in fig. 2). The first threshold interval and the second threshold interval are continuous, and the lower threshold of the first threshold interval is equal to the upper threshold of the second threshold interval. The second threshold interval is preferably set to 3 ℃ or less. In the second stage, the temperature difference is small, the compressor is controlled according to the PID algorithm, the response overshoot of the system can be effectively avoided, and the compressor is enabled to enter a steady state as soon as possible. The input parameters of the PID algorithm are temperature difference and the change rate of the temperature difference, and the output parameters are the target frequency of the compressor.
In order to improve the comfort of the air-conditioned room, the fluctuation of the temperature of the air-conditioned room is reduced. And a first electronic expansion valve is arranged on a refrigerant pipeline of the first heat exchanger corresponding to the first fan, and a second electronic expansion valve is arranged on a refrigerant pipeline of the second heat exchanger corresponding to the second fan. After the air conditioner enters a differential control mode, if the temperature difference belongs to a first threshold interval, the compressor is controlled to operate according to the differential frequency. Meanwhile, the opening degree of the first electronic expansion valve is controlled to be reduced along with the reduction of the wind speed of the first fan, and the opening degree of the second electronic expansion valve is controlled to be reduced along with the reduction of the wind speed of the second fan. The first electronic expansion valve and the second electronic expansion valve are always kept in an open state (step S206 shown in fig. 2). In the first stage of the differential control mode, the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve can be adjusted through a fuzzy control algorithm or a table look-up method, and for the latter, the empirically established first fan wind speed and the opening degree corresponding to the first electronic expansion valve, and the fuzzy control table of the second fan wind speed and the opening degree corresponding to the second electronic expansion valve are stored in a storage unit of the air conditioner controller, and the opening degrees of the first electronic expansion valve and the second electronic expansion valve are obtained through a direct table look-up method according to the first fan wind speed and the second fan wind speed. The mode has simple control structure, high response speed and low resource expenditure, and is particularly suitable for the double-through-flow air conditioner with various user requirements and complex air conditioner parameter coupling relation. After entering the second stage, the opening degrees of the first electronic expansion valve and the second electronic expansion valve are preferably adjusted by adopting a fuzzy algorithm, the input parameter is the superheat degree of the first heat exchanger and the second heat exchanger, and the output parameter is the opening degree of the electronic expansion valves. The adjusting algorithm of the valve opening degree of the second stage is consistent with the opening degree control algorithm of the electronic expansion valve of the variable frequency air conditioner in the prior art, which is not the protection key point of the invention and is not repeated here.
As an example in the first embodiment, the first fan disposed on the left side is operated with low wind, and the second fan disposed on the right side is operated with high wind. In order to reduce the temperature fluctuation of the air-conditioned room, when the temperature difference is greater than 3 ℃, it is preferable to set the first electronic expansion valve (as shown in fig. 6, fig. 3) on the left side to be maintained at a distance of 50 steps from the closing critical point, look up a table to obtain the opening degree of the electronic expansion valve in the high wind state, and adjust the second electronic expansion valve on the right side to have the opening degree of the electronic expansion valve in the high wind state. In this way, a small amount of refrigerant can be maintained in the first heat exchanger on the left (as shown in fig. 6, fig. 1), while a larger flow of refrigerant is maintained in the second heat exchanger on the right, reducing overall energy consumption while maintaining customer demand.
Referring to fig. 3, a flow chart of a third embodiment of the air conditioner control method according to the present invention is shown. When the user needs a large refrigerating capacity, the air conditioner is controlled according to a constant speed control mode. The user controls the first fan to operate at a first set wind speed through the control device, and controls the second fan to operate at a second set wind speed (step S301 shown in fig. 3). If the first set wind speed and the second set wind speed are equal and both the first set wind speed and the second set wind speed are the highest wind speed, the air conditioner enters a constant speed control mode (step S302 shown in fig. 3).
The air conditioner controller stores the corresponding relation between the outdoor environment temperature and the compressor running frequency in the constant speed control mode. The air conditioner controller samples the real-time outdoor ambient temperature (step S303 shown in fig. 3), calls a corresponding set compressor operating frequency according to the real-time outdoor ambient temperature (step S304 shown in fig. 3), and controls the compressor to operate according to the set compressor operating frequency in the constant speed control mode (step S305 shown in fig. 3). And simultaneously controlling the first electronic expansion valve and the second electronic expansion valve to keep a full-open state (step S306 shown in fig. 3), and keeping the maximum refrigerant flow.
More specifically, in the constant speed control mode, the outdoor ambient temperature is preferably divided into a plurality of intervals, and each interval corresponds to a set value of the operating frequency of the compressor. And when the real-time outdoor environment temperature is matched with any one interval, executing a corresponding compressor running frequency set value. Optionally, the outdoor environment temperature may be in an interval of every 6 ℃ or every 7 ℃, on the premise of ensuring maximum energy saving, the target frequency of the compressor is rapidly obtained according to the preset conditions, and meanwhile, the opening degree of the electronic expansion valve is rapidly adjusted, the flow of the refrigerant is controlled, and the temperature difference fluctuation in the room is reduced, so that the comfort of the air conditioner can be enhanced.
The differential control mode and the constant speed control mode are combined, the starting characteristic and the variable load dynamic characteristic of the refrigerating system are greatly improved, the requirement of a user on the cold quantity of an air-conditioning room can be quickly responded, and the heat exchanger is further guaranteed to be high in use efficiency, stable in operation, low in energy consumption and good in temperature control precision.
For guaranteeing the normal refrigeration and heating effect of first heat exchanger and second heat exchanger, form the protection to the compressor simultaneously, be provided with first coil pipe temperature sensor on first heat exchanger, be provided with second coil pipe temperature sensor on second heat exchanger, the first coil pipe temperature that first coil pipe temperature sensor detected is sampled to and the second coil pipe temperature that second coil pipe temperature sensor detected. The first coil temperature and the second coil temperature are further compared. If the air conditioner is operated in a cooling or dehumidifying mode, the lower value of the first coil temperature and the second coil temperature is sampled as the early warning coil temperature. When the temperature of the early warning coil is lower than a set threshold value, an alarm signal is output to control the compressor to stop. The threshold was set at around 0 ℃. Similarly, if the air conditioner is operating in the heating mode, the higher of the first coil temperature and the second coil temperature is sampled as the early warning coil temperature. When the temperature of the early warning coil is higher than a set threshold value, an alarm signal is output to control the compressor to stop, and the set threshold value is about 70 ℃, so that the influence on the whole refrigerating system caused by abnormal load of the first heat exchanger or the second heat exchanger is avoided.
As mentioned above, the first coil temperature and the second coil temperature are used for indicating the heat exchange effect of the first heat exchanger and the second heat exchanger, if the heat exchanger is divided unevenly, the phenomenon that other branches operate normally, and frost formation occurs due to the fact that the system pressure is too low due to too much refrigerant in one branch can occur. This can affect the operation of the overall refrigerant system. Therefore, the first coil temperature sensor and the second coil temperature sensor are respectively arranged in the middle of the branch pipe with the lowest outlet air temperature of the first heat exchanger and the second heat exchanger. Preferably the path with the coil lowermost.
The invention also discloses an air conditioner control device. The air conditioner control device includes a first fan and a second fan. A differential determination unit a for determining whether or not the wind speed of the first fan and the wind speed of the second fan satisfy a control condition of a differential control mode; the control condition of the differential speed control mode is that the first set wind speed and the second set wind speed are not equal, and the first set wind speed and the second set wind speed are not equal to zero;
the compressor frequency determining unit B is used for calling a corresponding first set operation frequency according to the first set wind speed, calling a corresponding second set operation frequency according to the second set wind speed, calculating the differential operation frequency and controlling the compressor to operate according to the differential operation frequency after entering the differential control mode; wherein the differential operating frequency is equal to an average of the first set operating frequency and the second set operating frequency.
The invention also discloses an air conditioner adopting the control method, and the control method specifically refers to the detailed description of the three embodiments and the detailed description of the drawings in the specification, which are not repeated herein. The 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 (7)

1. A control method of an air conditioner, the air conditioner at least comprises a first fan and a second fan, and the control method is characterized by comprising the following steps:
a user sets the first fan to operate according to a first set wind speed, and sets the second fan to operate according to a second set wind speed; if the first set wind speed and the second set wind speed are not equal, and the first set wind speed and the second set wind speed are not equal to zero, the air conditioner enters a differential control mode;
calling a corresponding first set operation frequency according to the first set wind speed, calling a corresponding second set operation frequency according to the second set wind speed, calculating a differential operation frequency and controlling a compressor to operate according to the differential operation frequency; wherein the differential operating frequency is equal to an average of the first and second set operating frequencies;
a first electronic expansion valve is arranged on a refrigerant pipeline of the first heat exchanger corresponding to the first fan, and a second electronic expansion valve is arranged on a refrigerant pipeline of the second heat exchanger corresponding to the second fan; after the air conditioner enters a differential control mode, judging whether the temperature difference between the set temperature and the indoor temperature belongs to a first threshold interval, if the temperature difference belongs to the first threshold interval, calculating the differential operation frequency and controlling the compressor to operate according to the differential operation frequency, wherein the opening degree of a first electronic expansion valve is reduced along with the reduction of the wind speed of a first fan, and the opening degree of a second electronic expansion valve is reduced along with the reduction of the wind speed of a second fan; the first electronic expansion valve and the second electronic expansion valve are kept in an open valve state.
2. The air conditioner control method according to claim 1, wherein after the air conditioner enters the differential speed control mode, if the temperature difference between the set temperature and the indoor temperature does not belong to the first threshold interval and the second threshold interval, calculating a target frequency of the compressor according to a PID algorithm and controlling the compressor to operate to the target frequency; the first threshold interval and the second threshold interval are continuous, and the lower threshold of the first threshold interval is equal to the upper threshold of the second threshold interval.
3. The air conditioner control method according to claim 2, characterized by further comprising the steps of:
if the first set wind speed is equal to the second set wind speed and the first set wind speed and the second set wind speed are both the highest wind speed, the air conditioner enters a constant speed control mode;
the air conditioner controller stores the corresponding relation between the outdoor environment temperature and the compressor running frequency in a constant speed control mode;
the air conditioner controller samples real-time outdoor environment temperature, calls corresponding set compressor running frequency according to the real-time outdoor environment temperature, and controls the compressor to run according to the set compressor running frequency; the first electronic expansion valve and the second electronic expansion valve are kept in a fully open state.
4. The air conditioner control method according to claim 3, characterized in that:
and under the constant speed control mode, the outdoor environment temperature is divided into a plurality of intervals, each interval corresponds to a compressor running frequency set value, and when the real-time outdoor environment temperature is matched with any interval, the corresponding compressor running frequency set value is executed.
5. The air conditioner control method according to claim 4, wherein:
a first coil pipe temperature sensor is arranged on the first heat exchanger, and a second coil pipe temperature sensor is arranged on the second heat exchanger; sampling first coil pipe temperature that first coil pipe temperature sensor detected, and the second coil pipe temperature that second coil pipe temperature sensor detected, according to the operation mode sample of air conditioner first coil pipe temperature and second coil pipe temperature's lower value or higher value are as early warning coil pipe temperature, work as early warning coil pipe temperature is when exceeding the settlement threshold value, output alarm signal.
6. The air conditioner control method according to claim 5, characterized in that:
and the first coil pipe temperature sensor and the second coil pipe temperature sensor are respectively arranged in the middle of one branch pipe with the lowest outlet air temperature of the first heat exchanger and the second heat exchanger.
7. An air conditioner characterized by employing the air conditioner control method as claimed in any one of claims 1 to 6.
CN201710623136.1A 2017-07-27 2017-07-27 Air conditioner control method and device and air conditioner Active CN107514743B (en)

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