CN108534309B - Air conditioning system and control method thereof - Google Patents

Air conditioning system and control method thereof Download PDF

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Publication number
CN108534309B
CN108534309B CN201810354003.3A CN201810354003A CN108534309B CN 108534309 B CN108534309 B CN 108534309B CN 201810354003 A CN201810354003 A CN 201810354003A CN 108534309 B CN108534309 B CN 108534309B
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China
Prior art keywords
outdoor unit
unit fan
gear
rotating speed
air conditioning
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CN201810354003.3A
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Chinese (zh)
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CN108534309A (en
Inventor
王新利
许永锋
熊美兵
冯明坤
赵浩伟
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Priority to CN201810354003.3A priority Critical patent/CN108534309B/en
Publication of CN108534309A publication Critical patent/CN108534309A/en
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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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • 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
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/11—Fan speed control
    • F25B2600/111—Fan speed control of condenser fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/195—Pressures of the condenser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioning system and a control method thereof, wherein the control method is used for a refrigeration mode and comprises the following steps: comparing the output rate m of the air conditioner with a first specified value G1, and enabling the outdoor unit fan to enter a conventional control mode when m is less than or equal to G1; when m is larger than G1, judging the refrigerant coefficient n, if n is in a specified range, enabling the outdoor unit fan to enter a conventional control mode, if not, judging whether the current rotating speed of the outdoor unit fan is in a specified gear, if so, enabling the outdoor unit fan to enter the conventional control mode, otherwise, enabling the outdoor unit fan to be lowered or raised by one gear, and then comparing the air conditioner output rate m with a first specified value G1 again after running for a first preset time T1, wherein the conventional control mode is that the rotating speed of the outdoor unit fan is controlled according to the system refrigerant pressure Pc of the outdoor unit. According to the control method provided by the embodiment of the invention, the operation of the outdoor unit fan can be always in the optimal state.

Description

Air conditioning system and control method thereof
Technical Field
The invention relates to the technical field of air conditioning systems, in particular to an air conditioning system and a control method thereof.
Background
With the improvement of living standard and the enhancement of energy-saving consciousness of people, the air conditioner has gone into the majority of common families by the characteristics of energy conservation, flexible control, easy installation and maintenance and the like, and is applied more and more widely. In recent years, energy is in short supply, and national policies also put higher and higher requirements on energy conservation and efficient operation of air conditioning systems. However, in the related art, the control mode and the control logic of the air conditioning system cannot make the air conditioning system in the efficient operation state at all times, so that the heat transfer efficiency of the heat exchanger cannot be effectively exerted, and further the actual operation effect of the whole unit is affected, and the efficient heat transfer technology needs to be further developed and utilized.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a control method of an air conditioning system, which can enable the operation of an outdoor unit fan to be always in an optimal state.
The invention also provides an air conditioning system adopting the control method.
According to the control method of the air conditioning system of the embodiment of the invention, the control method is used for a cooling mode and comprises the following steps: comparing the output rate m of the air conditioner with a first specified value G1 and executing corresponding operation according to the comparison result, wherein when m is less than or equal to G1, the outdoor unit fan enters a conventional control mode; when m is larger than G1, judging the refrigerant coefficient n, if n is in a specified range, enabling the outdoor unit fan to enter the conventional control mode, if n is not in the specified range, judging whether the current rotating speed of the outdoor unit fan is in a specified gear, if yes, enabling the outdoor unit fan to enter the conventional control mode, if not, enabling the outdoor unit fan to be lowered or raised by one gear, and then executing corresponding operation again according to the comparison result of the air conditioner output rate m and the first specified value G1 after running for a first preset time T1, wherein the conventional control mode is that the rotating speed of the outdoor unit fan is controlled according to the system refrigerant pressure Pc of the outdoor unit.
According to the control method of the air conditioning system, the rotating speed regulation of the outdoor unit fan can be automatically controlled, so that the outdoor unit fan is always in the optimal state in operation, the heat exchange efficiency and reliability of the air conditioning system are improved, the air conditioning system is operated in a more efficient and energy-saving mode, and the heat exchange effect of the whole air conditioning system is improved.
In addition, the control method of the air conditioning system according to the above embodiment of the present invention may further have the following additional technical features:
according to the control method of the air conditioning system of the embodiment of the invention, the specified gears include a specified high gear and a specified low gear, wherein if the value of n is lower than the minimum value of the specified range, whether the current rotating speed of the outdoor unit fan is the specified low gear is judged, if yes, the outdoor unit fan is enabled to enter the conventional control mode, if no, the current rotating speed of the outdoor unit fan is enabled to be reduced by one gear, the size of the air conditioning output rate m is judged again after the outdoor unit fan operates for the first preset time T1, corresponding operation is executed according to the judgment result, if the value of n is higher than the maximum value of the specified range, whether the current rotating speed of the outdoor unit fan is the specified high gear is judged, if yes, the outdoor unit fan is enabled to enter the conventional control mode, if no, the current rotating speed of the outdoor unit fan is enabled to be increased by one gear, and judging the size of the air conditioner output rate m again after the first preset time T1 is operated, and executing corresponding operation according to the judgment result.
Further, the prescribed low gear is the lowest gear, and the prescribed high gear is the highest gear.
According to some embodiments of the present invention, the predetermined range includes a first range [ a, b ] and a second range [ c, d ], the air conditioning system is provided with a second predetermined value G2, G1 < G2, wherein when m is greater than or equal to G2, if n is within the first range [ a, b ], the outdoor unit fan is put into the normal control mode, if n is not within the first range [ a, b ], whether the current rotation speed of the outdoor unit fan is at the predetermined gear is determined, if yes, the outdoor unit fan is put into the normal control mode, if no, the outdoor unit fan is lowered or raised by one gear, and then the magnitude of the air conditioning output rate m is determined again after the first predetermined time T1 is operated and corresponding operation is performed according to the determination result; and when G1 is less than m and less than G2, if n is in the second range [ c, d ], enabling the outdoor unit fan to enter the conventional control mode, if n is not in the second range [ c, d ], judging whether the current rotating speed of the outdoor unit fan is in the specified gear, if yes, enabling the outdoor unit fan to enter the conventional control mode, if not, enabling the outdoor unit fan to be lowered or raised by one gear, then judging the size of the air conditioner output rate m again after the first preset time T1 is operated, and executing corresponding operation according to the judgment result.
In some embodiments of the invention, the prescribed gears include a prescribed high gear and a prescribed low gear, and when m ≧ G2, if n < a, detecting whether the rotating speed of the outdoor unit fan is in the specified low level, if so, enabling the outdoor unit fan to enter the conventional control mode, if not, reducing the rotating speed of the outdoor unit fan by one level, and then judging the size of the air conditioner output rate m again after the first preset time T1 is operated, and executing corresponding operation according to the judgment result, if n is more than b, judging whether the current rotating speed of the outdoor unit fan is the specified high grade or not, if so, enabling the outdoor unit fan to enter the conventional control mode, if not, enabling the current rotating speed of the outdoor unit fan to be increased by one grade, and then judging the size of the air conditioner output rate m again after the first preset time T1 is operated, and executing corresponding operation according to the judgment result.
In some embodiments of the present invention, the prescribed gears include a prescribed high gear and a prescribed low gear, and when G1 < m < G2, if n < c, judging whether the rotating speed of the outdoor unit fan is in the specified low level, if so, enabling the outdoor unit fan to enter the conventional control mode, if not, reducing the rotating speed of the outdoor unit fan by one level, and then judging the size of the air conditioner output rate m again after the first preset time T1 is operated, and executing corresponding operation according to the judgment result, if n is more than d, judging whether the current rotating speed of the outdoor unit fan is the specified high grade or not, if so, enabling the outdoor unit fan to enter the conventional control mode, if not, enabling the current rotating speed of the outdoor unit fan to be increased by one grade, and then judging the size of the air conditioner output rate m again after the first preset time T1 is operated, and executing corresponding operation according to the judgment result.
Optionally, b > a, d > c, b > d or b ═ d, a > c or a ═ c, [ a, b ] > [ c, d ] or [ a, b ] ═ c, d ].
According to some embodiments of the invention, G1 has a value in the range of 20% to 40% and G2 has a value in the range of 60% to 80%.
Alternatively, the outdoor ambient temperature Th and the outdoor condenser outlet line temperature Tc, n-being (Tb1-Tc)/(Tb1-Th), n-being (Tb2-Tc)/(Tb2-Th), or n-being (Tb3-Tc)/(Tb3-Th) are detected for one of the outdoor condenser outlet refrigerant pressure P1, the outdoor condenser inlet refrigerant pressure P2 and the compressor discharge pressure P3, where Tb1, Tb2 and Tb3 are saturation temperatures corresponding to the outdoor condenser outlet refrigerant pressure P1, the outdoor condenser inlet refrigerant pressure P2 and the compressor discharge pressure P3, respectively.
In some embodiments of the present invention, when the air conditioning system is controlled to enter the cooling mode, the outdoor unit fan operates for 20 ± 5 seconds according to an initial wind level corresponding to an outdoor ambient temperature Th, and then compares the air conditioner output rate m with the first predetermined value G1 and performs a corresponding operation according to the comparison result.
According to some embodiments of the invention, 1min ≦ T1 ≦ 5 min.
In some embodiments of the invention, the normal control mode comprises the steps of: comparing the system refrigerant pressure Pc of the outdoor unit with a third prescribed value G3 and a fourth prescribed value G4 every second predetermined time T2, and performing corresponding operations according to the comparison result, wherein Pc is one of an outdoor condenser outlet refrigerant pressure P1, an outdoor condenser inlet refrigerant pressure P2 and a compressor discharge pressure P3, if Pc is greater than or equal to G3, the outdoor unit fan is raised by one gear, and if the current rotation speed is the highest gear, the outdoor unit fan is maintained at the highest gear; if Pc is less than or equal to G4, reducing the fan of the outdoor unit by one gear, and if the current rotating speed is the lowest gear, keeping the current rotating speed at the lowest gear; and if G4 is less than Pc and less than G3, keeping the current rotating speed of the outdoor unit fan.
The air conditioning system according to the embodiment of the present invention employs the control method of the air conditioning system according to the embodiment of the present invention.
Further, the air conditioning system comprises an air conditioning unit.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow diagram of a control method according to one embodiment of the invention;
FIG. 2 is a schematic flow chart diagram of a control method according to another embodiment of the invention;
FIG. 3 is a flow chart diagram of a control method according to yet another embodiment of the invention;
FIG. 4 is a flow chart diagram of a control method according to yet another embodiment of the present invention;
FIG. 5 is a flow chart illustrating a conventional control scheme of a control method according to an embodiment of the present invention;
fig. 6 is a flow chart illustrating a control method according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below are exemplary embodiments for explaining the present invention with reference to the drawings and should not be construed as limiting the present invention, and those skilled in the art can make various changes, modifications, substitutions and alterations to the embodiments without departing from the principle and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
A control method of an air conditioning system according to an embodiment of the present invention is described below with reference to the accompanying drawings.
Referring to fig. 1, a control method of an air conditioning system according to an embodiment of the present invention may be used in a cooling mode, and the control method includes the steps of:
step 101: comparing the air conditioner output rate m with a first specified value G1, and then executing corresponding operation according to the comparison result;
when m is less than or equal to G1, executing step 102: enabling an outdoor unit fan to enter a conventional control mode;
when m > G1, then step 103 is performed: judging the size of the refrigerant coefficient n, and then executing corresponding operation according to whether the refrigerant coefficient n is in a specified range;
if n is within the prescribed range, executing step 102: enabling an outdoor unit fan to enter a conventional control mode;
if n is not within the predetermined range, execute step 104: judging whether the current rotating speed of the outdoor unit fan is in a specified gear, and then executing corresponding operation according to a judgment result;
if the current rotating speed of the outdoor unit fan is in a specified gear, executing the step 102: enabling an outdoor unit fan to enter a conventional control mode;
if the current rotating speed of the outdoor unit fan is not in the specified gear, executing step 105: and (3) lowering or raising the outdoor unit fan for the first gear, then returning to the step (101) after running for the first preset time T1, and executing corresponding operation according to the comparison result of the air conditioner output rate m and the first prescribed value G1.
It should be noted that, in some embodiments of the present invention, the air conditioning output rate m refers to a ratio of a heat exchange amount actually required by the air conditioning system to a rated heat exchange amount of the air conditioning system. The refrigerant coefficient n is a parameter for measuring the utilization rate of the refrigerant of the air conditioning system and the degree of the refrigerant liquid accumulation in the condenser, and the capacity of the air conditioning system for realizing heat exchange through the refrigerant can be judged according to the refrigerant coefficient n. In addition, the conventional control mode is to control the rotation speed of the outdoor unit fan according to the system refrigerant pressure Pc of the outdoor unit, so that the system refrigerant pressure Pc of the outdoor unit is matched with the rotation speed, and the outdoor unit fan operates more stably and efficiently.
In the invention, whether the outdoor unit fan directly enters the conventional control mode or the conventional control mode is judged according to the output rate m of the air conditioner, and the rotating speed of the outdoor unit fan is rationalized by using the refrigerant coefficient n. In addition, in the process of rationalizing the rotating speed of the outdoor unit fan by using the refrigerant coefficient n, the operating gear of the outdoor unit fan is reduced or increased according to the size of the refrigerant coefficient n to adjust the rotating speed, so that the rotating speed of the outdoor unit fan can better meet the actual heat exchange quantity requirement, the energy waste caused by overhigh rotating speed of the outdoor unit fan is avoided, or the rotating speed of the outdoor unit fan is too low to meet the heat exchange quantity requirement. The operation of off-premises station fan is in optimum all the time, improves the refrigerant utilization ratio to improve air conditioning system's heat exchange efficiency and reliability, air conditioning system can be with more energy-efficient mode operation, not only can improve the travelling comfort in the user's use, can satisfy the dual demand of energy development and market development moreover.
According to the control method of the air conditioning system, the gear of the outdoor unit fan is rationalized according to the key parameters of the air conditioning system, namely the air conditioning output rate m and the refrigerant coefficient n, the rotating speed adjustment of the outdoor unit fan can be automatically controlled, the operation of the outdoor unit fan is always in the optimal state, the heat exchange efficiency and the reliability of the air conditioning system are improved, the air conditioning system operates in a more efficient and energy-saving mode, and the heat exchange effect of the whole air conditioning system is improved.
According to some embodiments of the present invention, as shown in fig. 2, the prescribed gear may include a prescribed high gear and a prescribed low gear, and the control method includes the steps of:
step 201: comparing the air conditioner output rate m with a first specified value G1, and then executing corresponding operation according to the comparison result;
when m is less than or equal to G1, step 202 is executed: enabling an outdoor unit fan to enter a conventional control mode;
when m > G1, then step 203 is performed: judging the size of the refrigerant coefficient n, and then executing corresponding operation according to the judgment result;
if n is within the specified range, go to step 202: enabling an outdoor unit fan to enter a conventional control mode;
if the value of n is lower than the minimum value of the specified range, execute step 204: judging whether the current rotating speed of the outdoor unit fan is in a specified low level or not, and then executing corresponding operation according to a judgment result;
if the current rotating speed of the outdoor unit fan is the specified low gear, executing step 202: enabling an outdoor unit fan to enter a conventional control mode; if the current rotating speed of the outdoor unit fan is not the prescribed low gear, step 205 is executed: reducing the current rotating speed of the outdoor unit fan by one gear, and after the outdoor unit fan operates for the first preset time T1, returning to execute the step 201: judging the output rate m of the air conditioner and executing corresponding operation according to the judgment result;
if the value of n is higher than the maximum value of the specified range, execute step 206: judging whether the current rotating speed of the outdoor unit fan is a specified high-grade or not, and then executing corresponding operation according to a judgment result;
if the current rotating speed of the outdoor unit fan is a specified high level, step 202 is executed: enabling an outdoor unit fan to enter a conventional control mode; if the current rotating speed of the outdoor unit fan is the specified low gear, step 207 is executed: and increasing the current rotating speed of the outdoor unit fan by one gear, and after the outdoor unit fan runs for the first preset time T1, returning to execute the step 201: and judging the output rate m of the air conditioner and executing corresponding operation according to the judgment result.
Further, in the present invention, the low gear may be the lowest gear, and the high gear may be the highest gear, where the rotation speed of the outdoor unit fan at the lowest gear may be zero or not, which is within the protection scope of the present invention. And when the value of n is lower than the minimum value of the specified range, judging whether the current rotating speed of the outdoor unit fan is the lowest gear or not, if not, reducing the current rotating speed of the outdoor unit fan by one gear, judging the output rate m of the air conditioner again after running for the first preset time T1, and executing corresponding operation according to the judgment result. And if the value of n is still lower than the minimum value of the specified range and the current rotating speed of the outdoor unit fan is not the lowest gear in the operation process, reducing the current rotating speed of the outdoor unit fan by one gear again.
And when the value of n is higher than the maximum value of the specified range, judging whether the current rotating speed of the outdoor unit fan is the highest gear or not, if not, increasing the current rotating speed of the outdoor unit fan by one gear, operating for a first preset time T1, judging the size of the output rate m of the air conditioner again, and executing corresponding operation according to the judgment result. And if the value of n is still higher than the minimum value of the specified range and the current rotating speed of the outdoor unit fan is not the highest gear in the operation process, increasing the current rotating speed of the outdoor unit fan by one gear again.
In some embodiments of the present invention, as shown in fig. 3, the prescribed range may include a first range [ a, b ] and a second range [ c, d ], the air conditioning system may be provided with a second prescribed value G2, and G1 < G2, and the control method may include the steps of:
step 301: comparing the air conditioner output rate m with a first specified value G1, and then executing corresponding operation according to the comparison result;
when m is less than or equal to G1, executing step 302: enabling an outdoor unit fan to enter a conventional control mode;
when m is greater than or equal to G2, step 303 is executed: carrying out first logic judgment on the size of the refrigerant coefficient n, and then executing corresponding operation according to whether the refrigerant coefficient n is in a first range [ a, b ];
if n is within the first range [ a, b ], go to step 302: enabling an outdoor unit fan to enter a conventional control mode;
if n is not within the first range [ a, b ], then step 304 is performed: judging whether the current rotating speed of the outdoor unit fan is in a specified gear, and then executing corresponding operation according to a judgment result;
if the current rotating speed of the outdoor unit fan is in a specified gear, executing step 302: enabling an outdoor unit fan to enter a conventional control mode; if the current rotating speed of the outdoor unit fan is not in the specified gear, executing step 305: the outdoor unit fan is lowered or raised by a first gear, and then after the outdoor unit fan is operated for a first preset time T1, the method returns to the step 301: judging the output rate m of the air conditioner and executing corresponding operation according to the judgment result;
when G1 < m < G2, then execute step 306: performing second logic judgment on the size of the refrigerant coefficient n, and then executing corresponding operation according to whether the refrigerant coefficient n is in a second range [ c, d ];
if n is within the second range [ c, d ], go to step 302: enabling an outdoor unit fan to enter a conventional control mode;
if n is not within the second range [ c, d ], go to step 307: judging whether the current rotating speed of the outdoor unit fan is in a specified gear, and then executing corresponding operation according to a judgment result;
if the current rotating speed of the outdoor unit fan is in a specified gear, executing step 302: enabling an outdoor unit fan to enter a conventional control mode; if the current rotating speed of the outdoor unit fan is not in the specified gear, step 308 is executed: the outdoor unit fan is lowered or raised by a first gear, and then after the outdoor unit fan is operated for a first preset time T1, the method returns to the step 301: and judging the output rate m of the air conditioner and executing corresponding operation according to the judgment result.
According to a further embodiment of the present invention, as shown in fig. 4, the prescribed gear may include a prescribed high gear and a prescribed low gear, and the control method may include the steps of:
step 401: comparing the air conditioner output rate m with a first specified value G1, and then executing corresponding operation according to the comparison result;
when m is less than or equal to G1, executing step 402: enabling an outdoor unit fan to enter a conventional control mode;
when m is greater than or equal to G2, step 403 is executed: carrying out first logic judgment on the size of the refrigerant coefficient n, and then executing corresponding operation according to whether the refrigerant coefficient n is in a first range [ a, b ];
if n is within the first range [ a, b ], then step 402 is performed: enabling an outdoor unit fan to enter a conventional control mode;
if n < a, go to step 404: judging whether the current rotating speed of the outdoor unit fan is in a specified low level or not, and then executing corresponding operation according to a judgment result;
if the current rotating speed of the outdoor unit fan is in a specified low gear, executing step 402: enabling an outdoor unit fan to enter a conventional control mode; if the current rotating speed of the outdoor unit fan is not in the specified low gear, step 405 is executed: the outdoor unit fan is lowered by one gear, and then after the outdoor unit fan is operated for the first preset time T1, the method returns to the step 401: judging the output rate m of the air conditioner and executing corresponding operation according to the judgment result;
if n > b, go to step 406: judging whether the current rotating speed of the outdoor unit fan is a specified high-grade or not, and then executing corresponding operation according to a judgment result;
if the current rotating speed of the outdoor unit fan is in a specified high range, executing step 402: enabling an outdoor unit fan to enter a conventional control mode; if the current rotating speed of the outdoor unit fan is not in the specified high range, step 407 is executed: the outdoor unit fan is raised by one gear, and then after the outdoor unit fan is operated for the first preset time T1, the method returns to the step 401: judging the output rate m of the air conditioner and executing corresponding operation according to the judgment result;
when G1 < m < G2, then step 408 is performed: performing second logic judgment on the size of the refrigerant coefficient n, and then executing corresponding operation according to whether the refrigerant coefficient n is in a second range [ c, d ];
if n is within the second range [ c, d ], go to step 402: enabling an outdoor unit fan to enter a conventional control mode;
if n is less than c, go to step 409: judging whether the rotating speed of the outdoor unit fan is in a specified low level or not, and then executing corresponding operation according to a judgment result;
if the rotating speed of the outdoor unit fan is in a specified low level, executing step 402: enabling an outdoor unit fan to enter a conventional control mode; if the current rotating speed of the outdoor unit fan is not in the specified low gear, step 410 is executed: the outdoor unit fan is lowered by one gear, and then after the outdoor unit fan is operated for the first preset time T1, the method returns to the step 401: judging the output rate m of the air conditioner and executing corresponding operation according to the judgment result;
if n > d, go to step 411: judging whether the current rotating speed of the outdoor unit fan is a specified high-grade or not, and then executing corresponding operation according to a judgment result;
if the current rotating speed of the outdoor unit fan is in a specified high range, executing step 402: enabling an outdoor unit fan to enter a conventional control mode; if the current rotating speed of the outdoor unit fan is not in the specified high range, step 412 is executed: the outdoor unit fan is raised by one gear, and then after the outdoor unit fan is operated for the first preset time T1, the method returns to the step 401: and judging the output rate m of the air conditioner and executing corresponding operation according to the judgment result.
In the embodiment where the predetermined range includes the first range [ a, b ] and the second range [ c, d ], the larger the air conditioner output rate m is, the higher the required heat exchange amount is, and the larger the corresponding refrigerant coefficient n is, and therefore, the maximum value of the first range [ a, b ] in which the refrigerant coefficient n is determined to be larger than or equal to G2 is not lower than the maximum value of the second range [ c, d ] in which the refrigerant coefficient n is determined to be larger than or equal to G1 < m < G2, that is, b is not smaller than d. For example, in some embodiments of the invention, b > a, d > c, [ a, b ] > [ c, d ] or [ a, b ] ═ c, d ], where [ a, b ] > [ c, d ], b > d ≧ a > c, or b ≧ d > a > c, or b > d > c, or b > a > c, [ a, b ] ═ c, b ═ d > c, or b > a ═ d > c.
In addition, in the invention, the value range of G1 is 20-40%, the value of G2 is 60-80%, and the specific values of G1 and G2 can be flexibly set according to the specific conditions of the air conditioner, for example, G1 can be 20%, 25%, 30%, 35%, 40%, etc., G2 can be 60%, 65%, 70%, 75%, 80%, etc., and the requirement that G1 is less than G2 only needs to be met.
According to some embodiments of the present invention, the control method of the air conditioning system may detect one of an outdoor condenser outlet refrigerant pressure P1, an outdoor condenser inlet refrigerant pressure P2, and a compressor discharge pressure P3, an outdoor ambient temperature Th, and an outdoor condenser pipe temperature (e.g., an outdoor condenser outlet pipe temperature) Tc, and the refrigerant coefficient n may be calculated as:
n ═ Tb1-Tc)/(Tb1-Th), n ═ Tb2-Tc)/(Tb2-Th or n ═ Tb3-Tc)/(Tb3-Th)
Tb1, Tb2, and Tb3 are saturation temperatures corresponding to the outdoor condenser outlet refrigerant pressure P1, the outdoor condenser inlet refrigerant pressure P2, and the compressor discharge pressure P3, respectively. According to some embodiments of the present invention, the control method of the air conditioning system may detect one of P1, P2, and P3, Th, and Tc at any time, and automatically calculate the refrigerant coefficient n, so as to control the rotation speed of the outdoor unit fan according to the magnitude of the refrigerant coefficient n.
In some embodiments of the present invention, when the air conditioning system is controlled to enter the cooling mode, the outdoor unit fan may first operate for a predetermined time according to an initial wind level corresponding to the outdoor environment temperature Th, for example, may operate for 20 ± 5 seconds in the initial wind level, so as to stabilize the operation of the air conditioning system, and then compare the output rate m of the air conditioner with the first predetermined value G1 and perform a corresponding operation according to the comparison result.
It can be understood that if the first predetermined time T1 for the outdoor unit fan to operate after lowering or raising the gear is too short, it is not favorable for the outdoor unit fan to operate stably and the parameter detection is too frequent, which may cause energy waste, and if T1 is too long, it may reduce the high efficiency of the air conditioning system operation, therefore, in the present invention, T1 is not more than 1min and not more than 5 min. For example, in some embodiments of the invention, T1 may be 1.5min, 2min, 2.5min, 3min, 3.5min, 4min, 4.5min, and the like, respectively.
According to some embodiments of the present invention, as shown in fig. 5, the normal control mode is to control the rotation speed of the outdoor unit fan according to the system refrigerant pressure Pc of the outdoor unit, wherein the system refrigerant pressure Pc may be one of an outdoor condenser outlet refrigerant pressure P1, an outdoor condenser inlet refrigerant pressure P2 and a compressor discharge pressure P3. Specifically, the normal control mode includes the steps of:
step 501: comparing the system refrigerant pressure Pc of the outdoor unit with a third prescribed value G3 and a fourth prescribed value G4, and performing corresponding operations according to the comparison result;
if Pc is greater than or equal to G3, go to step 502: after the outdoor unit fan is raised to the first gear and then operated for the second preset time T2, the process returns to step 501: executing corresponding operation according to the comparison result of the system refrigerant pressure Pc and the third prescribed value G3 and the fourth prescribed value G4;
if Pc is less than or equal to G4, go to step 503: the outdoor unit fan is lowered by one gear, and then, after the operation is performed for the second predetermined time T2, the process returns to the step 501: executing corresponding operation according to the comparison result of the system refrigerant pressure Pc and the third prescribed value G3 and the fourth prescribed value G4;
if G4 < Pc < G3, go to step 504: keeping the current rotating speed of the outdoor unit fan, and then returning to execute the step 501 after the outdoor unit fan operates for a second preset time T2: and performing corresponding operation according to the comparison result of the system refrigerant pressure Pc and the third and fourth prescribed values G3 and G4.
It should be noted that when Pc is greater than or equal to G3, if the current rotation speed of the outdoor unit fan is the highest gear, the gear is not raised any more, and is kept at the highest gear; and when Pc is less than or equal to G4, if the current rotating speed of the outdoor unit fan is the lowest gear, the gear is not reduced any more and is kept at the lowest gear.
In addition, if the second predetermined time T2 is too short, the operation of the outdoor unit fan may be unstable and the detection is too frequent, which may cause energy waste, and if the second predetermined time T2 is too long, it may not be ensured that the outdoor unit fan adjusts the rotation speed in time to keep efficient operation. Therefore, in the present invention, 5 seconds T2 is 20 seconds. For example, according to some embodiments of the invention, the second predetermined time T2 may be 7 seconds, 10 seconds, 15 seconds, 18 seconds, and the like, respectively.
The air conditioning system according to the embodiment of the present invention employs the control method of the air conditioning system according to the embodiment of the present invention. The control method of the air conditioning system according to the embodiment of the invention has the beneficial technical effects, so that the air conditioning system according to the embodiment of the invention can realize automatic control of the rotating speed regulation of the outdoor unit fan, and the operation of the outdoor unit fan is always in the optimal state, thereby improving the heat exchange efficiency and reliability of the air conditioning system, operating in a more efficient and energy-saving manner and improving the heat exchange effect of the whole air conditioning system.
Further, the air conditioning system may include an air conditioning unit.
Still further, the air conditioning unit may include an indoor unit and an outdoor unit, the outdoor unit may include an outdoor ambient temperature sensor, an outdoor condenser pipe temperature sensor, an outdoor condenser refrigerant pressure sensor, a compressor, and a compressor discharge pressure sensor, and the air conditioning system may further include a control unit.
The control unit can control the outdoor environment temperature sensor to detect the outdoor environment temperature Th constantly, the outdoor condenser pipeline temperature sensor to detect the outdoor condenser pipeline temperature Tc constantly, the outdoor condenser refrigerant pressure sensor to detect the outdoor condenser outlet refrigerant pressure P1 or the outdoor condenser inlet refrigerant pressure P2 constantly, and the compressor exhaust pressure sensor to detect the compressor exhaust pressure P3 constantly, and execute the control method of the air conditioning system according to the embodiment of the invention to judge the air conditioner output rate m in real time and calculate the refrigerant coefficient n and the like according to the detection data.
A control method of an air conditioning system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, it being understood that the following description is illustrative only and not to be construed as limiting the invention.
As shown in fig. 6, after the air conditioning system receives the start command, the control unit first determines the start mode, and if the air conditioning system operates in the cooling mode, the outdoor unit fan operates for 20 seconds according to the initial wind level corresponding to the outdoor environment temperature Th. The control unit detects the outdoor environment temperature Th, the pressure P1 of the refrigerant at the outlet of the outdoor condenser and the temperature Tc of the pipeline of the outdoor condenser in real time, and automatically calculates the saturation temperature Tb1 corresponding to P1.
The control unit can judge the air conditioner output rate m in real time, wherein m is the heat exchange amount actually required by the air conditioning system/the rated heat exchange amount of the air conditioning system.
If m is larger than or equal to 70%, the refrigerant coefficient n is automatically calculated and a first logic judgment is carried out. A refrigerant coefficient n is automatically calculated by the control unit, where n is (saturation temperature for the outdoor condenser outlet refrigerant pressure-outdoor condenser line temperature)/(saturation temperature for the outdoor condenser outlet refrigerant pressure-outdoor ambient temperature), i.e., n is (Tb1-Tc)/(Tb 1-Th).
Further, whether the refrigerant coefficient n is in a first range [ a, b ] is judged, and if yes, the outdoor unit fan enters a conventional control mode to adjust gears.
If the refrigerant coefficient n is not in the first range [ a, b ], further judging whether n < a is satisfied, if so, further judging whether the current rotating speed of the outdoor unit fan is the lowest gear, if so, entering the conventional control mode to adjust the gear, if not, reducing the gear by one gear at the current gear, and then judging the size of the air conditioner output rate m again according to the air conditioner output rate m detected in real time after running for two minutes.
If n is less than a, further judging whether n is greater than b, if so, further judging whether the current rotating speed of the outdoor unit fan is the highest gear, if so, entering the conventional control mode to adjust the gear of the outdoor unit fan, if not, increasing the current gear by one gear, and then judging the output rate m of the air conditioner again according to the output rate m of the air conditioner detected in real time after running for two minutes.
If n is larger than b, returning to judge the air conditioner output rate m again according to the air conditioner output rate m detected in real time.
If m is more than 30% and less than 70%, the refrigerant coefficient n is automatically calculated and second logic judgment is carried out.
And further, judging whether the refrigerant coefficient n is in a second range [ c, d ], and if so, enabling the outdoor unit fan to enter a conventional control mode to adjust gears.
If the refrigerant coefficient n is not in the second range [ c, d ], further judging whether n is greater than c, if so, further judging whether the current rotating speed of the outdoor unit fan is the lowest gear, if so, entering the conventional control mode to adjust the gear, if not, reducing the gear by one gear at the current gear, and then judging the size of the air conditioner output rate m again according to the air conditioner output rate m detected in real time after running for two minutes.
If n is less than c, further judging whether n is greater than d, if so, further judging whether the current rotating speed of the outdoor unit fan is the highest gear, if so, entering the conventional control mode to adjust the gear of the outdoor unit fan, if not, increasing the gear of the current gear by one, and then judging the output rate m of the air conditioner again according to the output rate m of the air conditioner detected in real time after running for two minutes.
If n is larger than b, returning to judge the air conditioner output rate m again according to the air conditioner output rate m detected in real time.
Wherein b > a, d > c, b > d or b ═ d, a > c or a ═ c, [ a, b ] > [ c, d ] or [ a, b ] ═ c, d ].
If m is less than or equal to 30%, the outdoor unit fan does not control gears according to the refrigerant coefficient, and the outdoor unit fan directly enters a conventional control mode to operate.
Other configurations and operations of the air conditioning system and the control method according to the embodiment of the present invention will be known to those skilled in the art and will not be described in detail herein.
In the description herein, references to the description of the terms "embodiment," "particular embodiment," "example," etc., mean that a particular feature, process, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, acts or characteristics described may be combined in any suitable manner in any one or more of the embodiments or examples without interference or inconsistency.

Claims (13)

1. A control method of an air conditioning system, the control method being used in a cooling mode and comprising the steps of:
compares the air conditioner output rate m with the first prescribed value G1 and performs a corresponding operation according to the comparison result, wherein,
when m is less than or equal to G1, enabling the outdoor unit fan to enter a conventional control mode;
when m is larger than G1, judging the refrigerant coefficient n, if n is in a specified range, enabling the outdoor unit fan to enter the conventional control mode, if n is not in the specified range, judging whether the current rotating speed of the outdoor unit fan is in a specified gear, if yes, enabling the outdoor unit fan to enter the conventional control mode, if not, enabling the outdoor unit fan to be lowered or raised by one gear, then executing corresponding operation again according to the comparison result of the air conditioner output rate m and the first specified value G1 after running for a first preset time T1, wherein the conventional control mode is that the rotating speed of the outdoor unit fan is controlled according to the system refrigerant pressure Pc of the outdoor unit,
the air conditioning output rate m refers to the ratio of the heat exchange amount actually required by the air conditioning system to the rated heat exchange amount of the air conditioning system, one of the pressure P1 of the refrigerant at the outlet of the outdoor condenser, the pressure P2 of the refrigerant at the inlet of the outdoor condenser and the pressure P3 of the exhaust gas of the compressor, the outdoor ambient temperature Th and the temperature Tc of the outlet pipeline of the outdoor condenser are detected, n is (Tb1-Tc)/(Tb1-Th), n is (Tb2-Tc)/(Tb2-Th) or n is (Tb3-Tc)/(Tb3-Th), wherein Tb1, Tb2 and Tb3 are saturation temperatures corresponding to the refrigerant outlet pressure P1, the refrigerant inlet pressure P2 and the discharge pressure P3 of the compressor respectively, pc is one of an outdoor condenser outlet refrigerant pressure P1, an outdoor condenser inlet refrigerant pressure P2, and a compressor discharge pressure P3.
2. The control method of an air conditioning system according to claim 1, characterized in that the prescribed gear includes a prescribed high gear and a prescribed low gear, wherein,
if the value of n is lower than the minimum value of the specified range, judging whether the current rotating speed of the outdoor unit fan is the specified low gear or not, if so, enabling the outdoor unit fan to enter the conventional control mode, if not, enabling the current rotating speed of the outdoor unit fan to be reduced by one gear, judging the size of the air conditioner output rate m again after the first preset time T1 is operated, and executing corresponding operation according to the judgment result,
if the value of n is higher than the maximum value of the specified range, judging whether the current rotating speed of the outdoor unit fan is the specified high-grade, if so, enabling the outdoor unit fan to enter the conventional control mode, if not, enabling the current rotating speed of the outdoor unit fan to be increased by one grade, judging the output rate m of the air conditioner again after the first preset time T1 is operated, and executing corresponding operation according to the judgment result.
3. The control method of an air conditioning system according to claim 2, wherein the prescribed low range is a lowest range, and the prescribed high range is a highest range.
4. The control method of an air conditioning system according to claim 1, wherein the prescribed ranges include a first range [ a, b ] and a second range [ c, d ], the air conditioning system is provided with a second prescribed value G2, G1 < G2, wherein,
when m is larger than or equal to G2, if n is within the first range [ a, b ], enabling the outdoor unit fan to enter the conventional control mode, if n is not within the first range [ a, b ], judging whether the current rotating speed of the outdoor unit fan is in the specified gear, if yes, enabling the outdoor unit fan to enter the conventional control mode, if not, enabling the outdoor unit fan to be reduced or increased by one gear, then judging the size of the air conditioner output rate m again after operating the first preset time T1, and executing corresponding operation according to the judgment result;
and when G1 is less than m and less than G2, if n is in the second range [ c, d ], enabling the outdoor unit fan to enter the conventional control mode, if n is not in the second range [ c, d ], judging whether the current rotating speed of the outdoor unit fan is in the specified gear, if yes, enabling the outdoor unit fan to enter the conventional control mode, if not, enabling the outdoor unit fan to be lowered or raised by one gear, then judging the size of the air conditioner output rate m again after the first preset time T1 is operated, and executing corresponding operation according to the judgment result.
5. The control method of an air conditioning system according to claim 4, wherein the prescribed gear includes a prescribed high gear and a prescribed low gear, and when m ≧ G2,
if n is less than a, detecting whether the rotating speed of the outdoor unit fan is in the specified low gear, if so, enabling the outdoor unit fan to enter the conventional control mode, if not, reducing the rotating speed of the outdoor unit fan by one gear, then judging the size of the air conditioner output rate m again after the first preset time T1 is operated, and executing corresponding operation according to the judgment result,
if n is greater than b, judging whether the current rotating speed of the outdoor unit fan is the specified high grade, if so, enabling the outdoor unit fan to enter the conventional control mode, if not, enabling the current rotating speed of the outdoor unit fan to be increased by one grade, then judging the output rate m of the air conditioner again after the first preset time T1 is operated, and executing corresponding operation according to the judgment result.
6. The control method of an air conditioning system according to claim 4, characterized in that the prescribed gear includes a prescribed high gear and a prescribed low gear, and when G1 < m < G2,
if n is less than c, judging whether the rotating speed of the outdoor unit fan is in the specified low level, if so, enabling the outdoor unit fan to enter the conventional control mode, if not, reducing the rotating speed of the outdoor unit fan by one level, then judging the size of the air conditioner output rate m again after the first preset time T1 is operated, and executing corresponding operation according to the judgment result,
if n is larger than d, judging whether the current rotating speed of the outdoor unit fan is the specified high grade, if so, enabling the outdoor unit fan to enter the conventional control mode, if not, enabling the current rotating speed of the outdoor unit fan to be increased by one grade, then judging the output rate m of the air conditioner again after the first preset time T1 is operated, and executing corresponding operation according to the judgment result.
7. The control method of an air conditioning system according to any one of claims 4 to 6, wherein b > a, d > c, b > d or b ═ d, a > c or a ═ c, [ a, b ] > [ c, d ] or [ a, b ] ═ c, d ].
8. The control method of the air conditioning system according to any one of claims 4 to 6, wherein a value range of G1 is 20% to 40%, and a value range of G2 is 60% to 80%.
9. The method of claim 1, wherein when the air conditioning system is controlled to enter the cooling mode, the outdoor unit fan is operated for 20 ± 5 seconds according to an initial windshield temperature corresponding to an outdoor ambient temperature Th, and then the air conditioning output rate m is compared with the first predetermined value G1 and corresponding operation is performed according to the comparison result.
10. The control method of an air conditioning system according to claim 1, wherein T1 is 1min ≦ T1 ≦ 5 min.
11. The control method of an air conditioning system according to claim 1, wherein the normal control mode includes the steps of:
comparing the system refrigerant pressure Pc of the outdoor unit with a third prescribed value G3 and a fourth prescribed value G4 every second predetermined time T2 and performing corresponding operations according to the comparison result,
if Pc is larger than or equal to G3, the outdoor unit fan is raised by one gear, and if the current rotating speed is the highest gear, the current rotating speed is kept at the highest gear;
if Pc is less than or equal to G4, reducing the fan of the outdoor unit by one gear, and if the current rotating speed is the lowest gear, keeping the current rotating speed at the lowest gear;
and if G4 is less than Pc and less than G3, keeping the current rotating speed of the outdoor unit fan.
12. An air conditioning system characterized by employing the control method of the air conditioning system according to any one of claims 1 to 11.
13. The air conditioning system of claim 12, wherein the air conditioning system comprises an air conditioning unit.
CN201810354003.3A 2018-04-19 2018-04-19 Air conditioning system and control method thereof Active CN108534309B (en)

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