CN104567161A - Stable electronic expansion valve control method - Google Patents
Stable electronic expansion valve control method Download PDFInfo
- Publication number
- CN104567161A CN104567161A CN201410834971.6A CN201410834971A CN104567161A CN 104567161 A CN104567161 A CN 104567161A CN 201410834971 A CN201410834971 A CN 201410834971A CN 104567161 A CN104567161 A CN 104567161A
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- China
- Prior art keywords
- expansion valve
- electronic expansion
- degree
- opening degree
- heat pump
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Classifications
-
- 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
-
- 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
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Temperature (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses a stable electronic expansion valve control method, which includes the following steps: (A) when an electronic expansion valve is closed until the sum of a minimum opening degree and an opening degree deviation value, the opening degree of the electronic expansion valve is locked at the minimum opening degree, and the actual superheat degree of a heat pump system is then detected; (B) according to a comparison result between the actual superheat degree and a target superheat degree, the heat pump system is controlled. By detecting the opening degree of the electronic expansion valve, locking the adjustment pace of the electronic expansion valve at the minimum opening degree when the opening degree of the electronic expansion valve is less than a set value, and then carrying out corresponding control according to a current superheat degree, the method ensures that the electronic expansion valve can adjust the opening degree to be more than the minimum opening degree, thus ensuring not only the low-temperature heating effect of the system but also refrigerant flow needed by the evaporation of the system and the low-temperature evaporation effect of the system and enhancing the reliability of the system. Used as the stable electronic expansion valve control method, the invention can be widely applied in the field of heat pump control.
Description
Technical field
The present invention relates to heat pump control field, especially a kind of stable control method for electronic expansion valve.
Background technology
Under normal circumstances, the electric expansion valve of heat pump is all control according to system overheat degree, but, when heat pump be in low ring tender feeling condition under run time, in order to ensure the heating effect under low temperature environment, electric expansion valve constantly will turn down according to target superheat degree, thus occurs following problem:
1, still turning down to minimum aperture when electric expansion valve turns down, because the bore of electric expansion valve becomes more and more less, fluctuation is got up in adjustment will be increasing, thus have impact on the stable operation of system;
Although 2, above way ensure that the effect that system hypothermia heats, because the continuous reduction of cold medium flux, the evaporation effect of system can be have impact on the contrary, reduces system reliability.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the invention is: control method for electronic expansion valve stable under a kind of low temperature environment is provided.
The technical solution adopted in the present invention is: a kind of stable control method for electronic expansion valve, comprises the following steps:
A, when electric expansion valve turns down to minimum aperture and aperture deviate sum, the aperture of electric expansion valve is locked onto minimum aperture, then detects the actual degree of superheat of heat pump;
B, according to the comparative result of the actual degree of superheat and target superheat degree, heat pump to be controlled.
Further, described step B is specially:
B1, when the actual degree of superheat is greater than target superheat degree and the first temperature deviation value sum, controls the locking that heat pump exits minimum aperture and control, and carry out normal PID control;
B2, when the actual degree of superheat is greater than target superheat degree and the second temperature deviation value sum, start timing, after one section of delay time, control the locking that heat pump exits minimum aperture control, and carry out normal PID control.
Further, described first temperature deviation value is greater than the second temperature deviation value.
Further, described in described step B1, the first temperature deviation value is 10-20 DEG C.
Further, described in described step B2, the first temperature deviation value is 1-5 DEG C.
The invention has the beneficial effects as follows: this method is by detected electrons expansion valve opening and when it is less than setting value, electronic expansion valve regulation step number is locked in minimum aperture, then corresponding control is carried out according to the current actual degree of superheat, make electronic expansion valve regulation aperture more than minimum aperture, not only ensure that the effect that system hypothermia heats, also assures that the cold medium flux needed for evaporation and the low-temperature evaporation effect of system, improve the reliability of system.
Accompanying drawing explanation
Fig. 1 is the main flow chart of steps of the inventive method;
Fig. 2 is the flow chart of steps of the further enforcement of the inventive method.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
With reference to Fig. 1, a kind of stable control method for electronic expansion valve, comprises the following steps:
A, when electric expansion valve turns down to minimum aperture and aperture deviate sum, the aperture of electric expansion valve is locked onto minimum aperture, then detects the actual degree of superheat of heat pump;
If ensure the heating effect under low temperature environment, electric expansion valve constantly will turn down according to target superheat degree, thus causes the continuous reduction of cold medium flux in heat pump, and then affects evaporation effect, cause system reliability to reduce; Therefore set minimum aperture and aperture deviate in this method, because electronic expansion valve regulation aperture remains on more than minimum aperture, therefore do not affect evaporation effect, be conducive to modification stability.
B, according to the comparative result of the actual degree of superheat and target superheat degree, heat pump to be controlled.
With reference to Fig. 2, be further used as preferred embodiment, described step B is specially:
B1, when the actual degree of superheat is greater than target superheat degree and the first temperature deviation value sum, controls the locking that heat pump exits minimum aperture and control, and carry out normal PID control;
B2, when the actual degree of superheat is greater than target superheat degree and the second temperature deviation value sum, start timing, after one section of delay time, control the locking that heat pump exits minimum aperture control, and carry out normal PID control.
Wherein delay time can by software according to circumstances setting or set according to trouble free service experience in the past according to present case by staff automatically.
Be further used as preferred embodiment, in the arranging of said temperature deviate, described first temperature deviation value is greater than the second temperature deviation value.
In step bl is determined., because the actual degree of superheat is greater than target superheat degree and the first temperature deviation value sum, therefore the difference of the actual degree of superheat and target superheat degree is larger, the locking directly exiting minimum aperture controls, and uses under the actual degree of superheat being applicable to system can meet system stability Effec-tive Function condition.
In step B2, the difference of the actual degree of superheat and target superheat degree is relatively little, and the locking just exiting minimum aperture after therefore carrying out certain time delay controls, and uses under the actual degree of superheat being applicable to system also cannot meet system stability Effec-tive Function condition.
Be further used as preferred embodiment, described in described step B1, the first temperature deviation value is 10-20 DEG C.
Be further used as preferred embodiment, described in described step B2, the first temperature deviation value is 1-5 DEG C.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art can also make all equivalents or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent distortion or replacement are all included in the application's claim limited range.
Claims (5)
1. a stable control method for electronic expansion valve, is characterized in that: comprise the following steps:
A, when electric expansion valve turns down to minimum aperture and aperture deviate sum, the aperture of electric expansion valve is locked onto minimum aperture, then detects the actual degree of superheat of heat pump;
B, according to the comparative result of the actual degree of superheat and target superheat degree, heat pump to be controlled.
2. a kind of stable control method for electronic expansion valve according to claim 1, is characterized in that: described step B is specially:
B1, when the actual degree of superheat is greater than target superheat degree and the first temperature deviation value sum, controls the locking that heat pump exits minimum aperture and control, and carry out normal PID control;
B2, when the actual degree of superheat is greater than target superheat degree and the second temperature deviation value sum, start timing, after one section of delay time, control the locking that heat pump exits minimum aperture control, and carry out normal PID control.
3. a kind of stable control method for electronic expansion valve according to claim 2, is characterized in that: described first temperature deviation value is greater than the second temperature deviation value.
4. a kind of stable control method for electronic expansion valve according to claim 2, is characterized in that: described in described step B1, the first temperature deviation value is 10-20 DEG C.
5. a kind of stable control method for electronic expansion valve according to claim 2, is characterized in that: described in described step B2, the first temperature deviation value is 1-5 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410834971.6A CN104567161B (en) | 2014-12-29 | 2014-12-29 | Stable electronic expansion valve control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410834971.6A CN104567161B (en) | 2014-12-29 | 2014-12-29 | Stable electronic expansion valve control method |
Publications (2)
| Publication Number | Publication Date |
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| CN104567161A true CN104567161A (en) | 2015-04-29 |
| CN104567161B CN104567161B (en) | 2017-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410834971.6A Active CN104567161B (en) | 2014-12-29 | 2014-12-29 | Stable electronic expansion valve control method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108731313A (en) * | 2018-06-25 | 2018-11-02 | 宁波奥克斯电气股份有限公司 | expansion valve control method and air conditioner |
| CN109059369A (en) * | 2018-08-13 | 2018-12-21 | 宁波奥克斯电气股份有限公司 | A kind of control method of air-conditioning and multi-online air-conditioning system and air conditioner |
| CN111238075A (en) * | 2020-01-15 | 2020-06-05 | 广东芬尼克兹节能设备有限公司 | Variable-frequency CO2Control method and device for direct-heating electronic expansion valve and heat pump unit |
| CN112503811A (en) * | 2020-12-10 | 2021-03-16 | 珠海格力电器股份有限公司 | Control method of electronic expansion valve and heat pump system |
| CN112856865A (en) * | 2021-01-28 | 2021-05-28 | 山东奇威特太阳能科技有限公司 | Refrigerant flow control method and refrigerating unit |
| CN113324315A (en) * | 2020-02-28 | 2021-08-31 | 青岛海尔空调电子有限公司 | One-driving-two air conditioner and control method thereof |
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| CN103712309A (en) * | 2012-10-04 | 2014-04-09 | Tcl空调器(中山)有限公司 | Air-conditioner refrigerant flow control method |
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| CN102207320A (en) * | 2010-03-30 | 2011-10-05 | 海尔集团公司 | Control method of minimum opening of air conditioning expansion valves and air conditioning expansion valves |
| EP2407735A1 (en) * | 2010-04-30 | 2012-01-18 | Daikin Industries, Ltd. | Heat pump system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108731313A (en) * | 2018-06-25 | 2018-11-02 | 宁波奥克斯电气股份有限公司 | expansion valve control method and air conditioner |
| CN108731313B (en) * | 2018-06-25 | 2020-07-31 | 宁波奥克斯电气股份有限公司 | Expansion valve control method and air conditioner |
| CN109059369A (en) * | 2018-08-13 | 2018-12-21 | 宁波奥克斯电气股份有限公司 | A kind of control method of air-conditioning and multi-online air-conditioning system and air conditioner |
| CN111238075A (en) * | 2020-01-15 | 2020-06-05 | 广东芬尼克兹节能设备有限公司 | Variable-frequency CO2Control method and device for direct-heating electronic expansion valve and heat pump unit |
| CN113324315A (en) * | 2020-02-28 | 2021-08-31 | 青岛海尔空调电子有限公司 | One-driving-two air conditioner and control method thereof |
| WO2021169672A1 (en) * | 2020-02-28 | 2021-09-02 | 青岛海尔空调电子有限公司 | One-driving-two air conditioner and control method therefor |
| CN113324315B (en) * | 2020-02-28 | 2023-05-26 | 青岛海尔空调电子有限公司 | One-driving-two air conditioner and control method thereof |
| CN112503811A (en) * | 2020-12-10 | 2021-03-16 | 珠海格力电器股份有限公司 | Control method of electronic expansion valve and heat pump system |
| CN112856865A (en) * | 2021-01-28 | 2021-05-28 | 山东奇威特太阳能科技有限公司 | Refrigerant flow control method and refrigerating unit |
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| Publication number | Publication date |
|---|---|
| CN104567161B (en) | 2017-05-17 |
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