CN111795468A - Refrigeration control method for indoor unit electronic expansion valve - Google Patents
Refrigeration control method for indoor unit electronic expansion valve Download PDFInfo
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- CN111795468A CN111795468A CN202010672099.5A CN202010672099A CN111795468A CN 111795468 A CN111795468 A CN 111795468A CN 202010672099 A CN202010672099 A CN 202010672099A CN 111795468 A CN111795468 A CN 111795468A
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a refrigeration control method of an indoor unit electronic expansion valve, which is applied to a refrigeration system consisting of a compressor, an oil separator, a four-way valve, an outdoor unit, an indoor unit and a gas-liquid separator.
Description
Technical Field
The invention relates to an air conditioner control method, in particular to a control method of an electronic expansion valve of an air conditioner, and specifically relates to a refrigeration control method of an indoor unit electronic expansion valve.
Background
With the development of air conditioning technology, the variable frequency air conditioner is gradually favored by people with the advantages of good energy-saving effect, intelligent control, high comfort level and the like; the electronic expansion valve has the characteristics of wide regulation and control range, high precision and the like, and is widely applied to the internal and external machines of the frequency conversion unit. Therefore, the control of the electronic expansion valve becomes an important part in the air conditioning technology, and whether the control of the valve reasonably and directly influences the state, the reliability and even the user experience of the unit. Especially, the control of the electronic expansion valve is the most complicated because a plurality of internal machines in different operation environments need to be controlled simultaneously in the multi-split air conditioning unit. For controlling the electronic expansion valve of the internal machine, the valve opening degree is controlled by taking the superheat degree of the internal machine or the suction superheat degree of the external machine as main parameters at present. Because parameters such as the superheat degree of the inner machine and the suction superheat degree of the outer machine can only reflect the local running state of the refrigerating system, the opening degree of the valve of the inner machine is controlled according to the local parameters, the fluctuation of the system is easily caused, and the adverse effect is caused on the stable and efficient running of the unit. Therefore, improvements are needed.
Disclosure of Invention
The invention aims to provide a refrigeration control method of an indoor unit electronic expansion valve, which can control the valve opening of the refrigeration indoor unit from the overall state of a system, so that a unit can operate stably and efficiently, and the reliability and the user experience are improved.
The technical scheme of the invention is as follows:
a refrigeration control method of an indoor unit electronic expansion valve is applied to a refrigeration system consisting of a compressor, an oil separator, a four-way valve, an outdoor unit, an indoor unit and a gas-liquid separator;
an outdoor unit condensation temperature sensor is arranged in the middle of the outdoor unit and can detect the outdoor unit condensation temperature To 3;
an outlet end of the outdoor unit is provided with an outdoor unit electronic expansion valve; an outdoor unit condensed temperature sensor is arranged at the outlet end of the outdoor unit electronic expansion valve and can detect the condensed temperature To2 of the outdoor unit;
an inlet end of the indoor unit is provided with an indoor unit electronic expansion valve; an indoor unit disc inlet temperature sensor is arranged between the indoor unit electronic expansion valve and the indoor unit and can detect the indoor unit disc inlet temperature Ti 1;
an outlet end of the indoor unit is provided with an indoor unit outlet disc temperature sensor which can detect the indoor unit outlet disc temperature Ti 3;
an outer machine air suction temperature sensor and an outer machine low-pressure sensor are arranged at the inlet end of the gas-liquid separator and can respectively detect the outer machine air suction temperature To1 and the outer machine low-pressure LP;
an outlet end of the oil separator is provided with an outer machine high-pressure sensor which can detect the outer machine high-pressure HP;
the top of the compressor is provided with a compressor top temperature sensor which can detect the top temperature Tds of the compressor;
the control method comprises the following steps:
1) starting a system;
2) detecting whether the system is a starting-up process or not, if so, turning to the step 3); if not, turning to the step 4);
3) executing initial refrigeration control to enable the electronic expansion valve of the indoor unit to maintain the opening degree P0 for a duration time of t 0;
4) the normal control of the cooling is performed,
4.1) obtaining the actual indoor machine superheat degree E = Ti3-Ti1 by detecting every period t, further obtaining delta E = E-E, and recording the difference value of the ith period as delta Ei(ii) a Calculating a valve opening adjustment value Δ P1= K1 Δ E by a unit processori+K2*（ΔEi-ΔEi-1) (ii) a Wherein E is the superheat range of the target indoor unit; k1 and K2 are adjustment factors;
4.2) acquiring the actual air suction superheat degree H = To1-Te of the outdoor unit by detecting every period t, further acquiring delta H = H-H, and recording the difference value of the ith period as delta Hi; calculating a valve opening adjustment value delta P2 through the unit processor: Δ P2= K3 Δ Hi + K4 (Δ Hi-1); wherein Te is the saturation temperature of the refrigerant corresponding to LP; k3 and K4 are adjustment factors;
4.3) obtaining the actual supercooling degree C = To3-To2 of the outdoor unit by detecting every period t, further obtaining delta C = C-C, and recording the difference value of the ith period as delta Ci(ii) a Calculating a valve opening adjustment value Δ P3= K5 Δ C by a unit processori+K6*（ΔCi-ΔCi-1) (ii) a Wherein C is the supercooling degree range of the target outer machine; k5 and K6 are adjustment factors;
4.4) adjusting the opening degree of the electronic expansion valve of the indoor unit by delta P: Δ P = Q1 × Δ P1+ Q2 × Δ P2+ Q3 × Δ P3; wherein Q1, Q2 and Q3 are weighting coefficients, Q3 < Q1 < Q2;
5) detecting whether the system enters an oil return flow or not; if yes, go to step 6); if not, turning to step 7);
6) the opening degree of the electronic expansion valve of the indoor unit is kept at P2, the duration is t2, and then the step 4) is returned;
7) detecting whether the system enters a shutdown process or not; if yes, go to step 8); if not, turning to the step 4);
8) the electronic expansion valve of the indoor unit keeps the current opening degree until the electronic expansion valve is closed at t3 after the compressor stops;
9) obtaining the superheat Dsh = Tds-Tc of the top of the compressor through detection; if Dsh is more than Tp, closing the opening of the electronic expansion valve of the indoor unit by delta Pp every period, and then returning to the step 4); wherein: tc is the refrigerant saturation temperature corresponding to HP; tp and Δ Pp are determined by the indoor and outdoor ambient temperatures and Dsh.
Further, the P0 and t0 are determined according to the indoor and outdoor ambient temperature.
Further, E, H and C are all determined according to the indoor and outdoor ambient temperatures.
Further, the P2 and t2 are determined by the indoor and outdoor ambient temperature and the total cooling load.
The invention has the beneficial effects that:
the invention has reasonable design, clear logic and convenient control, can start from the integral state of the system, and integrates various factors to control the opening of the electronic expansion valve of the refrigeration indoor unit, thereby ensuring that the unit operates stably and efficiently, improving the reliability of the unit and improving the user experience.
Drawings
FIG. 1 is a control flow diagram of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
A refrigeration control method of an indoor unit electronic expansion valve is applied to a refrigeration system consisting of a compressor, an oil separator, a four-way valve, an outdoor unit, an indoor unit and a gas-liquid separator.
And an outdoor unit condensation temperature sensor is arranged in the middle of the outdoor unit and can detect the outdoor unit condensation temperature To 3.
An outlet end of the outdoor unit is provided with an outdoor unit electronic expansion valve; an outlet end of the outdoor unit electronic expansion valve is provided with an outdoor unit condensed temperature sensor which can detect the outdoor unit condensed temperature To 2.
An inlet end of the indoor unit is provided with an indoor unit electronic expansion valve; an indoor unit disc inlet temperature sensor is arranged between the indoor unit electronic expansion valve and the indoor unit and can detect the indoor unit disc inlet temperature Ti 1.
And an outlet end of the indoor unit is provided with an indoor unit outlet disc temperature sensor which can detect the indoor unit outlet disc temperature Ti 3.
And an outer machine air suction temperature sensor and an outer machine low-pressure sensor are arranged at the inlet end of the gas-liquid separator and can respectively detect the outer machine air suction temperature To1 and the outer machine low-pressure LP.
And an outlet end of the oil separator is provided with an outer machine high-pressure sensor which can detect the outer machine high-pressure HP.
The compressor top is equipped with compressor top temperature sensor, can detect compressor top temperature Tds.
The indoor units may be connected in parallel.
As shown in fig. 1, the control method includes the steps of:
1) starting a system;
2) detecting whether the system is a starting-up process or not, if so, turning to the step 3); if not, turning to the step 4);
3) executing initial refrigeration control to enable the electronic expansion valve of the indoor unit to maintain the opening degree P0 for a duration time of t 0; the P0 and t0 are determined according to the indoor and outdoor ambient temperature;
4) the normal control of the cooling is performed,
4.1) obtaining the actual indoor machine superheat degree E = Ti3-Ti1 by detecting every period t, further obtaining delta E = E-E, and recording the difference value of the ith period as delta Ei(ii) a Calculating a valve opening adjustment value Δ P1= K1 Δ E by a unit processori+K2*（ΔEi-ΔEi-1) (ii) a Wherein E is the superheat range of the target indoor unit; k1 and K2 are adjustment factors;
4.2) acquiring the actual air suction superheat degree H = To1-Te of the outdoor unit by detecting every period t, further acquiring delta H = H-H, and recording the difference value of the ith period as delta Hi; calculating a valve opening adjustment value delta P2 through the unit processor: Δ P2= K3 Δ Hi + K4 (Δ Hi-1); wherein Te is the saturation temperature of the refrigerant corresponding to LP; k3 and K4 are adjustment factors;
4.3) obtaining the actual supercooling degree C = To3-To2 of the outdoor unit by detecting every period t, further obtaining delta C = C-C, and recording the difference value of the ith period as delta Ci(ii) a Calculating a valve opening adjustment value Δ P3= K5 Δ C by a unit processori+K6*（ΔCi-ΔCi-1) (ii) a Wherein C is the supercooling degree range of the target outer machine; k5 and K6 are adjustment factors;
4.4) adjusting the opening degree of the electronic expansion valve of the indoor unit by delta P: Δ P = Q1 × Δ P1+ Q2 × Δ P2+ Q3 × Δ P3; q1, Q2 and Q3 are weighting coefficients, Q3 is more than Q1 is more than Q2, namely when the opening of the valve of the refrigeration inner machine is adjusted, the air suction superheat degree of the outer machine is a first consideration factor, the superheat degree of the inner machine is second, and finally the supercooling degree of the outer machine is obtained; the current valve opening of the internal machine is the opening of the previous period plus an opening adjustment value delta P;
5) detecting whether the system enters an oil return flow or not; if yes, go to step 6); if not, turning to step 7);
6) the opening degree of the electronic expansion valve of the indoor unit is kept at P2, the duration is t2, and then the step 4) is returned; the P2 and t2 are determined by the indoor and outdoor ambient temperature and the total refrigeration load;
7) detecting whether the system enters a shutdown process or not; if yes, go to step 8); if not, turning to the step 4);
8) the electronic expansion valve of the indoor unit keeps the current opening degree until the electronic expansion valve is closed at t3 after the compressor stops;
9) obtaining the superheat Dsh = Tds-Tc of the top of the compressor through detection; if Dsh is more than Tp, closing the opening of the electronic expansion valve of the indoor unit by delta Pp every period, and then returning to the step 4); wherein: tc is the refrigerant saturation temperature corresponding to HP; tp and Δ Pp are determined by the indoor and outdoor ambient temperatures and Dsh.
E, H and C are all determined according to the indoor and outdoor ambient temperatures.
The invention can start from the integral state of the system, and control the opening of the electronic expansion valve of the refrigeration indoor unit by integrating various factors, so that the unit can stably and efficiently operate, the reliability of the unit is improved, and the user experience is improved.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (4)
1. A refrigeration control method of an indoor unit electronic expansion valve is applied to a refrigeration system consisting of a compressor, an oil separator, a four-way valve, an outdoor unit, an indoor unit and a gas-liquid separator;
an outdoor unit condensation temperature sensor is arranged in the middle of the outdoor unit and can detect the outdoor unit condensation temperature To 3;
an outlet end of the outdoor unit is provided with an outdoor unit electronic expansion valve; an outdoor unit condensed temperature sensor is arranged at the outlet end of the outdoor unit electronic expansion valve and can detect the condensed temperature To2 of the outdoor unit;
an inlet end of the indoor unit is provided with an indoor unit electronic expansion valve; an indoor unit disc inlet temperature sensor is arranged between the indoor unit electronic expansion valve and the indoor unit and can detect the indoor unit disc inlet temperature Ti 1;
an outlet end of the indoor unit is provided with an indoor unit outlet disc temperature sensor which can detect the indoor unit outlet disc temperature Ti 3;
an outer machine air suction temperature sensor and an outer machine low-pressure sensor are arranged at the inlet end of the gas-liquid separator and can respectively detect the outer machine air suction temperature To1 and the outer machine low-pressure LP;
an outlet end of the oil separator is provided with an outer machine high-pressure sensor which can detect the outer machine high-pressure HP;
the top of the compressor is provided with a compressor top temperature sensor which can detect the top temperature Tds of the compressor;
the method is characterized in that: the control method comprises the following steps:
1) starting a system;
2) detecting whether the system is a starting-up process or not, if so, turning to the step 3); if not, turning to the step 4);
3) executing initial refrigeration control to enable the electronic expansion valve of the indoor unit to maintain the opening degree P0 for a duration time of t 0;
4) the normal control of the cooling is performed,
4.1) obtaining the actual indoor machine superheat degree E = Ti3-Ti1 by detecting every period t, further obtaining delta E = E-E, and recording the difference value of the ith period as delta Ei(ii) a Calculating a valve opening adjustment value Δ P1= K1 Δ E by a unit processori+K2*（ΔEi-ΔEi-1) (ii) a Wherein E is the superheat range of the target indoor unit; k1 and K2 are adjustment factors;
4.2) acquiring the actual air suction superheat degree H = To1-Te of the outdoor unit by detecting every period t, further acquiring delta H = H-H, and recording the difference value of the ith period as delta Hi; calculating a valve opening adjustment value delta P2 through the unit processor: Δ P2= K3 Δ Hi + K4 (Δ Hi-1); wherein Te is the saturation temperature of the refrigerant corresponding to LP; k3 and K4 are adjustment factors;
4.3) obtaining the actual supercooling degree C = To3-To2 of the outdoor unit by detecting every period t, further obtaining delta C = C-C, and recording the difference value of the ith period as delta Ci(ii) a Calculating a valve opening adjustment value Δ P3= K5 Δ C by a unit processori+K6*（ΔCi-ΔCi-1) (ii) a Wherein C is the supercooling degree range of the target outer machine; k5 and K6 are adjustment factors;
4.4) adjusting the opening degree of the electronic expansion valve of the indoor unit by delta P: Δ P = Q1 × Δ P1+ Q2 × Δ P2+ Q3 × Δ P3; wherein Q1, Q2 and Q3 are weighting coefficients, Q3 < Q1 < Q2;
5) detecting whether the system enters an oil return flow or not; if yes, go to step 6); if not, turning to step 7);
6) the opening degree of the electronic expansion valve of the indoor unit is kept at P2, the duration is t2, and then the step 4) is returned;
7) detecting whether the system enters a shutdown process or not; if yes, go to step 8); if not, turning to the step 4);
8) the electronic expansion valve of the indoor unit keeps the current opening degree until the electronic expansion valve is closed at t3 after the compressor stops;
9) obtaining the superheat Dsh = Tds-Tc of the top of the compressor through detection; if Dsh is more than Tp, closing the opening of the electronic expansion valve of the indoor unit by delta Pp every period, and then returning to the step 4); wherein: tc is the refrigerant saturation temperature corresponding to HP; tp and Δ Pp are determined by the indoor and outdoor ambient temperatures and Dsh.
2. The refrigeration control method of an indoor unit electronic expansion valve as claimed in claim 1, wherein: the P0 and t0 are determined according to the indoor and outdoor ambient temperature.
3. The refrigeration control method of an indoor unit electronic expansion valve as claimed in claim 1, wherein: e, H and C are all determined according to the indoor and outdoor ambient temperatures.
4. The refrigeration control method of an indoor unit electronic expansion valve as claimed in claim 1, wherein: the P2 and t2 are determined by the indoor and outdoor ambient temperature and the total cooling load.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113291128A (en) * | 2021-04-29 | 2021-08-24 | 东风柳州汽车有限公司 | Integrated power battery cooling system, cooling control method and electric automobile |
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| CN111271901A (en) * | 2019-12-24 | 2020-06-12 | 宁波奥克斯电气股份有限公司 | Oil return control method and system, air conditioner and computer readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113291128A (en) * | 2021-04-29 | 2021-08-24 | 东风柳州汽车有限公司 | Integrated power battery cooling system, cooling control method and electric automobile |
| CN113291128B (en) * | 2021-04-29 | 2022-05-03 | 东风柳州汽车有限公司 | Integrated power battery cooling system, cooling control method and electric automobile |
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