CN106568244A - Control method and system for opening degree of electronic expansion valve, and electrical equipment - Google Patents
Control method and system for opening degree of electronic expansion valve, and electrical equipment Download PDFInfo
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- CN106568244A CN106568244A CN201610988504.8A CN201610988504A CN106568244A CN 106568244 A CN106568244 A CN 106568244A CN 201610988504 A CN201610988504 A CN 201610988504A CN 106568244 A CN106568244 A CN 106568244A
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- Prior art keywords
- expansion valve
- pretravel
- electric expansion
- superheat
- pressure
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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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)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a control method and system for the opening degree of an electronic expansion valve, and electrical equipment. The control method comprises the following steps: the opening degree of the electronic expansion valve is obtained according to compressor performances and required working conditions of operation; the electronic expansion valve is opened according to pre-opening degree, and a preset time is kept; when the preset time is reached, whether pre-opening degree adjusting conditions are met or not is judged, if the pre-opening degree adjusting conditions are met, adjustment and control are performed on the pre-opening degree of the electronic expansion valve according to preset rules until a pre-opening degree exit condition is met, and the electronic expansion valve is controlled for automatic adjustment; if the pre-opening degree adjusting conditions are not met, the electronic expansion valve is directly controlled for automatic adjustment. According to the method provided by the invention, in the starting of a machine set, the system is enabled to be stable as fast as possible, and unnecessary fluctuations are reduced, so as to enable the machine set to be transited into a stable state smoothly.
Description
Technical field
The present invention relates to electronic expansion valve technology field, more particularly to a kind of electric expansion valve pretravel control method, it is
System and electric equipment.
Background technology
Electric expansion valve compares mechanical throttle device with very big advantage, although cost to higher, but will be avoided
The loaded down with trivial details and unstability that mechanical device is adjusted, also increases the flexibility of control.Electric expansion valve has been widely used for
Large Central Air Conditioning System.The widely used PI D controls of electronic expansion valve controls mode, according to suction superheat or discharge superheat
Desired value and variation tendency are adjusted making the system suction degree of superheat or discharge superheat finally stable near desired value,
But in unit starting, electric expansion valve opening speed affects, cause aperture not enough, and temperature change relatively slow, pressure becomes
Change very fast so that the degree of superheat adjusts distortion, a period of time could enter stable after degree of superheat fluctuation, and common solution is to start
Fix electronic expansion valve opening in advance before, PI D controls are carried out afterwards.
But there is limitation in fixed aperture, because under some working conditions, especially under the conditions of some extreme operating conditions,
Fixed opening value there may be deviation with being actually needed, and either aperture is not enough or aperture is too big, and particularly Unit Low is opened
It is dynamic, or in the case of frequent starting, the fluctuation of electronic expansion valve opening may badly influence unit operation, cause unit group
Low pressure treats liquid.
The content of the invention
The technical problem to be solved is for the deficiencies in the prior art, there is provided a kind of electric expansion valve pretravel
Control method, system and electric equipment.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of electric expansion valve pretravel control method, bag
Include following steps：
According to compressor performance and the working condition of needs operation, the pretravel of electric expansion valve is obtained；
Electric expansion valve is opened by pretravel, and keeps Preset Time；
When Preset Time is reached, judge whether to meet pretravel adjusting condition, according to preset rules pair if meeting
The pretravel of electric expansion valve is adjusted control, until meeting pretravel exit criteria, control electric expansion valve is carried out automatically
Adjust；If being unsatisfactory for pretravel adjusting condition, directly control electric expansion valve and automatically adjust.
The invention has the beneficial effects as follows：The present invention by unit starting, first according to compressor performance and operating mode bar
Part estimates the pretravel of electric expansion valve, and keeps pretravel to run Preset Time, but pretravel there may be with being actually needed
Deviation, therefore in the case where pretravel adjusting condition is met, pretravel is adjusted manually, until meet pretravel exiting
Condition；If after keeping pretravel operation Preset Time, having met and being actually needed, then directly controlling electric expansion valve is carried out automatically
Adjust；Present invention achieves in unit starting, system stability is made as early as possible, unnecessary fluctuation is reduced, make unit smooth transition
To stable state.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Further, above-mentioned technical proposal also includes pre-setting compressor performance and working condition and electronic expansion valve opening
The corresponding relation of value.
It is using the beneficial effect of above-mentioned further scheme：The present invention is by pre-setting compressor performance and electronic expansion
The corresponding relation of valve opening value, can quickly estimate to draw electricity when the pretravel of electric expansion valve is estimated according to compressor performance
The pretravel of sub- expansion valve.
Further, the compressor performance and working condition include with the corresponding relation of electronic expansion valve opening value：By institute
The default working condition under compressor performance is selected to need to be divided into n sections region, n sections region Zhong Meiduan areas according to range of operation and control
Domain one opening value of correspondence, or the corresponding relation of working condition parameter and opening value is directly fitted to into curve, each work
Condition condition parameter values one opening value of correspondence.
It is using the beneficial effect of above-mentioned further scheme：Electric expansion valve pretravel is according to compressor performance in the present invention
And it is segmented the method confirmation opening value of assignment or curve matching with reference to actual operating mode, it is possible to achieve quickly estimate electronic expansion
The pretravel of valve.
Further, the default working condition includes that inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi), exhaust are full
With temperature and air-breathing saturation temperature.
It is using the beneficial effect of above-mentioned further scheme：Compressor start advance leaving water temperature is consistent, Suck and exhaust pressure
Balance, therefore can be by inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi), exhaust saturation temperature and air-breathing saturation temperature
The pretravel of the parameter Estimation electric expansion valves such as degree.
Further, when current pressure of inspiration(Pi) and/or the current exhaust degree of superheat are less than preset value, then pretravel regulation is met
Condition, according to preset rules control is adjusted to the pretravel of electric expansion valve；Pretravel adjusting condition is otherwise unsatisfactory for, directly
Connect control electric expansion valve to automatically adjust.
It is using the beneficial effect of above-mentioned further scheme：The present invention is made with current pressure of inspiration(Pi) and the current exhaust degree of superheat
For reference frame, after the basic pretravel time, when any one is too low, according to aperture of the preset rules to electric expansion valve
Value is adjusted manually, until meeting pretravel exit criteria, then is automatically controlled, direct if two parameters are not low
Automatically controlled.
Further, in the case where pretravel adjusting condition is met the pretravel of electric expansion valve is entered according to preset rules
Row adjusts control to be included：
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is less than degree of superheat preset value Pes, then
Control electric expansion valve keeps current aperture, and continues detection until current pressure of inspiration(Pi) is more than default pressure of inspiration(Pi) disengaging value
PS_outAnd the current exhaust degree of superheat is more than default degree of superheat disengaging value PeS_out, control electric expansion valve entrance and automatically adjust；
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is default more than or equal to the degree of superheat
Value Pes, then the opening value of electric expansion valve is periodically stepped up, until current pressure of inspiration(Pi) is exited more than default pressure of inspiration(Pi)
Value PS_out, control electric expansion valve entrance and automatically adjust；
If current pressure of inspiration(Pi) is more than or equal to pressure preset PSAnd the current exhaust degree of superheat is default less than the degree of superheat
Value Pes, then the opening value of electric expansion valve is periodically progressively reduced, until the current exhaust degree of superheat is exited more than the default degree of superheat
Value PeS_out, control electric expansion valve entrance and automatically adjust；
Wherein, pressure preset PSLess than default pressure of inspiration(Pi) disengaging value PS_out；Degree of superheat preset value PesLess than presetting
Temperature disengaging value PeS_out。
It is using the beneficial effect of above-mentioned further scheme：Unit be this invention ensures that in current pressure of inspiration(Pi) and be vented
Under the too low working condition of temperature, or current pressure of inspiration(Pi) is too low and the normal working condition of discharge superheat under, or
Under the working condition that current pressure of inspiration(Pi) is normal and discharge superheat is too low, unit can be smoothly transitted to and automatically controlled person,
Fluctuation is reduced, the risk of generator protection is reduced, unit reliability service is made.
For achieving the above object, the present invention also provides a kind of electric expansion valve pretravel control system, including：
Pretravel estimation module, for according to the working condition of compressor performance and needs operation, obtaining electric expansion valve
Pretravel；
Pretravel setup module, by pretravel electric expansion valve is opened, and keeps Preset Time；
Pretravel adjustment module, when Preset Time is reached, judges whether to meet pretravel adjusting condition, if meeting
Control is adjusted to the pretravel of electric expansion valve according to preset rules, until meeting pretravel exit criteria, electronics is controlled
Expansion valve automatically adjusts；If being unsatisfactory for pretravel adjusting condition, directly control electric expansion valve and automatically adjust.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Above-mentioned technical proposal also includes provisioning module, swollen with electronics for pre-setting compressor performance and working condition
The corresponding relation of swollen valve opening value.
Further, the compressor performance and working condition include with the corresponding relation of electronic expansion valve opening value：By institute
The default working condition under compressor performance is selected to need to be divided into n sections region, n sections region Zhong Meiduan areas according to range of operation and control
Domain one opening value of correspondence, or the corresponding relation of working condition parameter and opening value is directly fitted to into curve, each work
Condition condition parameter values one opening value of correspondence.
Further, the default working condition includes that inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi), exhaust are full
With temperature and air-breathing saturation temperature.
Further, when current pressure of inspiration(Pi) and/or the current exhaust degree of superheat are less than preset value, then pretravel regulation is met
Condition, according to preset rules control is adjusted to the pretravel of electric expansion valve；Pretravel adjusting condition is otherwise unsatisfactory for, directly
Connect control electric expansion valve to automatically adjust.
Further, in the case where pretravel adjusting condition is met the pretravel of electric expansion valve is entered according to preset rules
Row adjusts control to be included：
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is less than degree of superheat preset value Pes, then
Control electric expansion valve keeps current aperture, and continues detection until current pressure of inspiration(Pi) is more than default pressure of inspiration(Pi) disengaging value
PS_outAnd the current exhaust degree of superheat is more than default degree of superheat disengaging value PeS_out, control electric expansion valve entrance and automatically adjust；
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is default more than or equal to the degree of superheat
Value Pes, then the opening value of electric expansion valve is periodically stepped up, until current pressure of inspiration(Pi) is exited more than default pressure of inspiration(Pi)
Value PS_out, control electric expansion valve entrance and automatically adjust；
If current pressure of inspiration(Pi) is more than or equal to pressure preset PSAnd the current exhaust degree of superheat is default less than the degree of superheat
Value Pes, then the opening value of electric expansion valve is periodically progressively reduced, until the current exhaust degree of superheat is exited more than the default degree of superheat
Value PeS_out, control electric expansion valve entrance and automatically adjust；
Wherein, pressure preset PSLess than default pressure of inspiration(Pi) disengaging value PS_out；Degree of superheat preset value PesLess than presetting
Temperature disengaging value PeS_out。
For achieving the above object, the present invention also provides a kind of electric equipment, including the electricity described in above-mentioned technical proposal
Sub- expansion valve pretravel control system.
Further, the electric equipment includes air-conditioning, Teat pump boiler and refrigerating equipment.
Description of the drawings
Fig. 1 is a kind of electric expansion valve pretravel control method flow chart that the embodiment of the present invention 1 is provided；
Fig. 2 is the inflow temperature and electronic expansion valve opening value corresponding relation schematic diagram that the embodiment of the present invention 2 is provided；
Fig. 3 is a kind of electric expansion valve pretravel control method flow chart that the embodiment of the present invention 2 is provided；
Fig. 4 is a kind of electric expansion valve pretravel control system block diagram provided in an embodiment of the present invention；
Fig. 5 is a kind of electric equipment schematic diagram provided in an embodiment of the present invention.
Specific embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, example is served only for explaining the present invention, and
It is non-for limiting the scope of the present invention.
Embodiment 1, as shown in figure 1, the embodiment of the present invention provides a kind of electric expansion valve pretravel control method, including such as
Lower step：
S1, according to compressor performance and the working condition of needs operation, obtains the pretravel of electric expansion valve；It is described pre- to open
Spend initial opening when starting for electric expansion valve；
S2, by pretravel electric expansion valve is opened, and keeps Preset Time；
S3, when Preset Time is reached, judges whether to meet pretravel adjusting condition, according to preset rules if meeting
Control is adjusted to the pretravel of electric expansion valve, until meeting pretravel exit criteria, control electric expansion valve is carried out certainly
It is dynamic to adjust；If being unsatisfactory for pretravel adjusting condition, directly control electric expansion valve and automatically adjust.
The present invention according to compressor performance and working condition by unit starting, estimating the pre- of electric expansion valve first
Aperture, and keep pretravel to run Preset Time, but pretravel there may be deviation with being actually needed, therefore meeting pretravel
In the case of adjusting condition, pretravel is adjusted manually, until meeting pretravel exit criteria；If keeping pretravel fortune
After row Preset Time, meet and be actually needed, then directly controlled electric expansion valve and automatically adjust；Present invention achieves in machine
When group starts, system stability is made as early as possible, reduce unnecessary fluctuation, make unit smooth transition to stable state.
The opening value after Preset Time is run according to pretravel and is adjusted and can be supplemented, delete according to service condition, or in advance
It is directly entered after the completion of aperture and automatically adjusts, particularly bad working environments can reaches good effect.
Also include pre-setting compressor performance and working condition with electronic expansion valve opening value in the embodiment of the present invention
Corresponding relation, because its performance of the compressor of different model is different, the operating condition scope that different compressors are adapted to is different, such as wraps
Include worst cold case, normal temperature operating mode and worst hot case etc., under different working conditions, the pretravel of electric expansion valve be it is different, because
This pre-sets the aperture of the electric expansion valve under compressor performance and different working conditions；The present invention is by pre-setting compression
The corresponding relation of machine performance and working condition and electronic expansion valve opening value, can when the pretravel of electric expansion valve is estimated root
The pretravel for drawing electric expansion valve is quickly estimated according to compressor performance.
Specifically, the compressor performance and working condition include with the corresponding relation of electronic expansion valve opening value：By institute
The default working condition under compressor performance is selected to need to be divided into n sections region, degree of taking away a according to range of operation and control1、a2、a3、
a4、a5……an, n sections region Zhong Meiduan regions correspondence one opening value, or by working condition parameter it is corresponding with opening value pass
System is directly fitted to curve, each working condition parameter value one opening value of correspondence.Joined according to current compressor performance in S1
Region belonging to numerical value or the corresponding opening value of the position acquisition on curve, and using the opening value for obtaining as pretravel.This
Electric expansion valve pretravel confirms opening value, Ke Yishi according to the method that compressor performance is segmented assignment or curve matching in invention
Now quickly estimate the pretravel of electric expansion valve.
Working condition is preset described in the embodiment of the present invention includes inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi)
Power, exhaust saturation temperature and air-breathing saturation temperature.Compressor start advance leaving water temperature is consistent, Suck and exhaust pressure balance, therefore
Can be by inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi), the exhaust parameter such as saturation temperature and air-breathing saturation temperature
Estimate the pretravel of electric expansion valve.
In step S3, when current pressure of inspiration(Pi) and/or the current exhaust degree of superheat are less than preset value, then pretravel tune is met
Section condition, according to preset rules control is adjusted to electric expansion valve；Pretravel adjusting condition is otherwise unsatisfactory for, electronics is controlled
Expansion valve automatically adjusts.The present invention using current pressure of inspiration(Pi) and the current exhaust degree of superheat as reference frame, when any one
When individual too low, the opening value of electric expansion valve is adjusted manually according to preset rules, until meet pretravel exit criteria,
Automatically controlled again, directly automatically controlled if two parameters are not low.
In the case where pretravel adjusting condition is met the pretravel of electric expansion valve is adjusted according to preset rules
Control includes：
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is less than degree of superheat preset value Pes, then
Control electric expansion valve keeps current aperture, and continues detection until current pressure of inspiration(Pi) is more than default pressure of inspiration(Pi) disengaging value
PS_outAnd the current exhaust degree of superheat is more than default degree of superheat disengaging value PeS_out, control electric expansion valve entrance and automatically adjust.This
At current pressure of inspiration(Pi) and current exhaust overheated too low (when being respectively less than preset value), control electric expansion valve is protected for invention
Hold current aperture to be failure to actuate, until when current pressure of inspiration(Pi) and the current exhaust degree of superheat are all higher than default disengaging value, exiting manually
Adjust, enter and automatically adjust；This invention ensures that unit in the too low operating mode of current pressure of inspiration(Pi) and the current exhaust degree of superheat
Under the conditions of, smoothly transit to and automatically control, fluctuation is reduced, the risk of generator protection is reduced, make unit reliability service.
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is default more than or equal to the degree of superheat
Value Pes, then the opening value of electric expansion valve is periodically stepped up, until current pressure of inspiration(Pi) is exited more than default pressure of inspiration(Pi)
Value PS_out, control electric expansion valve entrance and automatically adjust.The present invention current pressure of inspiration(Pi) is too low and the current exhaust degree of superheat just
Often when (i.e. current pressure of inspiration(Pi) is less than preset value, when the current exhaust degree of superheat is more than or equal to preset value), periodically progressively increase
Plus the opening value of electric expansion valve, specifically each cycle tc increase aperture a%, the incrementss of each cycle also can not be waited, according to root
Factually actual value and exit desired value difference to determine, the bigger incrementss of difference are bigger, and the less incrementss of difference are less；Work as pressure of inspiration(Pi)
When power is more than default pressure of inspiration(Pi) disengaging value, regulation manually is exited, enter and automatically adjust；This invention ensures that unit is inhaled currently
Atmospheric pressure is too low and the normal working condition of the current exhaust degree of superheat under, smoothly transit to and automatically control, reduce fluctuation, reduce machine
The risk of group protection, makes unit reliability service.
If current pressure of inspiration(Pi) is more than or equal to pressure preset PSAnd the current exhaust degree of superheat is default less than the degree of superheat
Value Pes, then the opening value of electric expansion valve is periodically progressively reduced, until the current exhaust degree of superheat is exited more than the default degree of superheat
Value PeS_out, control electric expansion valve entrance and automatically adjust.The present invention is normal in current pressure of inspiration(Pi) and current exhaust is overheated spends
When low (i.e. current pressure of inspiration(Pi) is more than or equal to preset value, when the current exhaust degree of superheat is less than preset value), periodically progressively subtract
The opening value of little electric expansion valve, specifically each cycle tc reduce aperture b%, the reduction amount of each cycle also can not be waited, according to root
Factually actual value and exit desired value difference to determine, the bigger reduction amount of difference is bigger, and the less reduction amount of difference is less, until currently
Discharge superheat exits regulation manually more than default degree of superheat disengaging value, enters and automatically adjusts.This invention ensures that unit is being worked as
Front pressure of inspiration(Pi) is smoothly transitted to and automatically controlled normally and under the too low working condition of the current exhaust degree of superheat, reduces fluctuation, drop
The risk of low generator protection, makes unit reliability service.
Wherein, pressure preset PSLess than default pressure of inspiration(Pi) disengaging value PS_out；Degree of superheat preset value PesLess than presetting
Temperature disengaging value PeS_out。
Embodiment 2, the embodiment of the present invention estimates that the pretravel of electric expansion valve is with certain model compressor inflow temperature
Example illustrates the technical scheme of the embodiment of the present invention.
As shown in Figure 2,3, inflow temperature needed according to range of operation and control in the embodiment of the present invention to be divided into n sections area
Domain, degree of taking away a1、a2、a3、a4、a5……an, n sections region Zhong Meiduan regions one opening value of correspondence, or working condition is joined
Number is directly fitted to curve with the corresponding relation of opening value, each working condition parameter value one opening value of correspondence, and conduct
Pretravel.
Control performs corresponding pretravel, and keeps after preset time t, and the temperature, pressure of unit operation tends towards stability.
But what the pretravel being to determine and actual conditions needed there may be deviation, if pretravel performs preset time t
Afterwards, current pressure of inspiration(Pi) is too low, less than pressure preset PS, to prevent fluctuation from causing protection, remain in that manually；
If current pressure of inspiration(Pi) is less than pressure preset PS, and discharge superheat is more than or equal to degree of superheat preset value
Pes, then periodically it is stepped up the opening value of electric expansion valve, i.e. each cycle tcIncrease aperture a%, pressure of inspiration(Pi) is more than default
Pressure of inspiration(Pi) disengaging value PS_outBacked off after random manually, is entered and automatically adjusted；
If current pressure of inspiration(Pi) is less than pressure preset PS, and the current exhaust degree of superheat is less than degree of superheat preset value Pes,
Electric expansion valve keeps current aperture to be failure to actuate, until pressure of inspiration(Pi) is more than default pressure of inspiration(Pi) disengaging value PS_outAnd discharge superheat
Degree is more than default degree of superheat disengaging value Pes_outBacked off after random is manual；
If pretravel performs preset time tcAfterwards, the current exhaust degree of superheat is less than degree of superheat preset value Pes, to prevent ripple
It is dynamic to cause protection, remain in that manually, if the current exhaust degree of superheat is less than degree of superheat preset value Pes, and current pressure of inspiration(Pi)
More than or equal to pressure preset PS, then each cycle tcReduce aperture a%；The current degree of superheat is more than default degree of superheat disengaging value
Pes_outBacked off after random manually, is entered and automatically adjusted.
As shown in figure 4, the embodiment of the present invention also provides a kind of electric expansion valve pretravel control system, including：
Pretravel estimation module, for according to the working condition of compressor performance and needs operation, obtaining electric expansion valve
Pretravel；
Pretravel setup module, for pressing pretravel electric expansion valve is opened, and keeps Preset Time；
Pretravel adjustment module, for when Preset Time is reached, judging whether to meet pretravel adjusting condition, if full
It is sufficient then control is adjusted to the pretravel of electric expansion valve according to preset rules, until meet pretravel exit criteria, control
Electric expansion valve automatically adjusts；If being unsatisfactory for pretravel adjusting condition, directly controlling electric expansion valve is carried out automatically
Adjust.
Above-mentioned technical proposal also includes provisioning module, swollen with electronics for pre-setting compressor performance and working condition
The corresponding relation of swollen valve opening value.
Specifically, the compressor performance and working condition include with the corresponding relation of electronic expansion valve opening value：By institute
The default working condition under compressor performance is selected to need to be divided into n sections region, n sections region Zhong Meiduan areas according to range of operation and control
Domain one opening value of correspondence, or the corresponding relation of working condition parameter and opening value is directly fitted to into curve, each work
Condition condition parameter values one opening value of correspondence.
Working condition is preset described in the embodiment of the present invention includes inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi)
Power, exhaust saturation temperature and air-breathing saturation temperature.
In the pretravel adjustment module of the embodiment of the present invention, it is less than in current pressure of inspiration(Pi) and/or the current exhaust degree of superheat
During preset value, then pretravel adjusting condition is met, control is adjusted to the pretravel of electric expansion valve according to preset rules；It is no
Pretravel adjusting condition is then unsatisfactory for, control electric expansion valve automatically adjusts.
In the case where pretravel adjusting condition is met the pretravel of electric expansion valve is adjusted according to preset rules
Control includes：
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is less than degree of superheat preset value Pes, then
Control electric expansion valve keeps current aperture, and continues detection until current pressure of inspiration(Pi) is more than default pressure of inspiration(Pi) disengaging value
PS_outAnd the current exhaust degree of superheat is more than default degree of superheat disengaging value PeS_out, control electric expansion valve entrance and automatically adjust.This
At current pressure of inspiration(Pi) and current exhaust overheated too low (when being respectively less than preset value), control electric expansion valve is protected for invention
Hold current aperture to be failure to actuate, until when current pressure of inspiration(Pi) and discharge superheat are all higher than default disengaging value, regulation manually is exited,
Into automatically adjusting；This invention ensures that unit in the too low working condition of current pressure of inspiration(Pi) and the current exhaust degree of superheat
Under, smoothly transit to and automatically control, fluctuation is reduced, the risk of generator protection is reduced, make unit reliability service.
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is more than degree of superheat preset value Pes, then
The opening value of electric expansion valve is periodically stepped up, until current pressure of inspiration(Pi) is more than default pressure of inspiration(Pi) disengaging value PS_out,
Control electric expansion valve is entered and automatically adjusted.The present invention current pressure of inspiration(Pi) is too low and the current exhaust degree of superheat it is normal (i.e. when
Front pressure of inspiration(Pi) is less than preset value, when the current exhaust degree of superheat is more than preset value) when, periodically it is stepped up electric expansion valve
Opening value, specifically each cycle tc increase aperture a%, when pressure of inspiration(Pi) is more than default pressure of inspiration(Pi) disengaging value, exits manually
Adjust, enter and automatically adjust；This invention ensures that unit current pressure of inspiration(Pi) is too low and the normal work of the current exhaust degree of superheat
Under the conditions of condition, smoothly transit to and automatically control, reduce fluctuation, reduce the risk of generator protection, make unit reliability service.
If current pressure of inspiration(Pi) is more than pressure preset PSAnd the current exhaust degree of superheat is less than degree of superheat preset value Pes, then
Periodically progressively reduce the opening value of electric expansion valve, until the current exhaust degree of superheat is more than default degree of superheat disengaging value PeS_out,
Control electric expansion valve is entered and automatically adjusted.The present invention current pressure of inspiration(Pi) is normal and the current exhaust degree of superheat it is too low (i.e. when
Front pressure of inspiration(Pi) is more than preset value, when the current exhaust degree of superheat is less than preset value) when, periodically progressively reduce electric expansion valve
Opening value, specifically each cycle tc reduces aperture a%, until the current exhaust degree of superheat is exited more than default degree of superheat disengaging value
Adjust manually, enter and automatically adjust.This invention ensures that unit is normal in current pressure of inspiration(Pi) and the current exhaust degree of superheat is too low
Working condition under, smoothly transit to and automatically control, reduce fluctuation, reduce generator protection risk, make unit reliability service.
Wherein, pressure preset PSLess than default pressure of inspiration(Pi) disengaging value PS_out；Degree of superheat preset value PesLess than presetting
Temperature disengaging value PeS_out。
As shown in figure 5, the embodiment of the present invention also provides a kind of electric equipment, including the electric expansion valve described in embodiment 4
Pretravel control system.Electric equipment described in the embodiment of the present invention can be air-conditioning and refrigerating equipment etc..The electronics
Expansion valve pretravel control system includes：Pretravel estimation module, for according to the operating mode bar of compressor performance and needs operation
Part, obtains the pretravel of electric expansion valve；Pretravel setup module, for pressing pretravel electric expansion valve is opened, and keeps pre-
If the time；Pretravel adjustment module, for when Preset Time is reached, judging whether to meet pretravel adjusting condition, if full
It is sufficient then control is adjusted to the pretravel of electric expansion valve according to preset rules, until meet pretravel exit criteria, control
Electric expansion valve automatically adjusts；If being unsatisfactory for pretravel adjusting condition, directly controlling electric expansion valve is carried out automatically
Adjust.
Above-mentioned technical proposal also includes provisioning module, swollen with electronics for pre-setting compressor performance and working condition
The corresponding relation of swollen valve opening value.Specifically, the compressor performance and working condition are corresponding with electronic expansion valve opening value
Relation includes：Default working condition under selected compressor performance is needed according to range of operation and control to be divided into n sections region, n
Section region Zhong Meiduan regions one opening value of correspondence, or working condition parameter is directly fitted to the corresponding relation of opening value
Curve, each working condition parameter value one opening value of correspondence.Described in the embodiment of the present invention preset working condition include into
Coolant-temperature gage, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi), exhaust saturation temperature and air-breathing saturation temperature.
When current pressure of inspiration(Pi) and/or the current exhaust degree of superheat are less than preset value, then pretravel adjusting condition, root are met
Control is adjusted to the pretravel of electric expansion valve according to preset rules；Pretravel adjusting condition is otherwise unsatisfactory for, electronics is controlled
Expansion valve automatically adjusts.
In the case where pretravel adjusting condition is met the pretravel of electric expansion valve is adjusted according to preset rules
Control includes：If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is less than degree of superheat preset value Pes,
Then control electric expansion valve and keep current aperture, and continue detection until current pressure of inspiration(Pi) is more than default pressure of inspiration(Pi) disengaging value
PS_outAnd the current exhaust degree of superheat is more than default degree of superheat disengaging value PeS_out, control electric expansion valve entrance and automatically adjust；Such as
The current pressure of inspiration(Pi) of fruit is less than pressure preset PSAnd the current exhaust degree of superheat is more than degree of superheat preset value Pes, then periodically progressively
Increase the opening value of electric expansion valve, until current pressure of inspiration(Pi) is more than default pressure of inspiration(Pi) disengaging value PS_out, control electronics swollen
Swollen valve is entered and automatically adjusted；If current pressure of inspiration(Pi) is more than pressure preset PSAnd discharge superheat is less than degree of superheat preset value
Pes, then the opening value of electric expansion valve is periodically progressively reduced, until the current exhaust degree of superheat is more than default degree of superheat disengaging value
PeS_out, control electric expansion valve entrance and automatically adjust.Wherein, pressure preset PSLess than default pressure of inspiration(Pi) disengaging value PS_out；
Degree of superheat preset value PesLess than default degree of superheat disengaging value PeS_out。
Those of ordinary skill in the art are it is to be appreciated that the list of each example with reference to the embodiments described herein description
Unit and algorithm steps, can with electronic hardware, computer software or the two be implemented in combination in, in order to clearly demonstrate hardware
With the interchangeability of software, according to function the composition and step of each example have been generally described in the above description.This
A little functions are performed with hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.Specially
Industry technical staff can use different methods to realize described function to each specific application, but this realization is not
It is considered as beyond the scope of this invention.
Those skilled in the art can be understood that, for convenience of description and succinctly, foregoing description is
The specific work process of system, device and unit, may be referred to the corresponding process in preceding method embodiment, will not be described here.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method, can be with
Realize by another way.For example, device embodiment described above is only schematic, for example, the division of unit,
It is only a kind of division of logic function, there can be other dividing mode when actually realizing, such as multiple units or component can be with
With reference to or be desirably integrated into another system, or some features can be ignored, or not perform.
Can be as the unit of separating component explanation or may not be physically separate, show as unit
Part can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple networks
On unit.Some or all of unit therein can according to the actual needs be selected to realize the mesh of embodiment of the present invention scheme
's.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit, it is also possible to
It is that unit is individually physically present, or two or more units are integrated in a unit.It is above-mentioned integrated
Unit both can be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If integrated unit is realized and as independent production marketing or when using using in the form of SFU software functional unit, can
In to be stored in a computer read/write memory medium.Based on such understanding, technical scheme substantially or
The part contributed to prior art is said, or all or part of the technical scheme can be embodied in the form of software product
Out, the computer software product is stored in a storage medium, including some instructions are used so that a computer equipment
(can be personal computer, server, or network equipment etc.) performs all or part of each embodiment method of the invention
Step.And aforesaid storage medium includes：It is USB flash disk, portable hard drive, read-only storage (ROM, Read-Only Memory), random
Access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with Jie of store program codes
Matter.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be with office
Combine in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
Art personnel can be tied the feature of the different embodiments or example described in this specification and different embodiments or example
Close and combine.
The foregoing is only presently preferred embodiments of the present invention, not to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (14)
1. a kind of electric expansion valve pretravel control method, it is characterised in that comprise the steps：
According to compressor performance and the working condition of needs operation, the pretravel of electric expansion valve is obtained；
Electric expansion valve is opened by pretravel, and keeps Preset Time；
When Preset Time is reached, judge whether to meet pretravel adjusting condition, according to preset rules to electronics if meeting
The pretravel of expansion valve is adjusted control, until meeting pretravel exit criteria, control electric expansion valve automatically adjusts；
If being unsatisfactory for pretravel adjusting condition, directly control electric expansion valve and automatically adjust.
2. electric expansion valve pretravel control method according to claim 1, it is characterised in that also including pre-setting pressure
The corresponding relation of contracting machine performance and working condition and electronic expansion valve opening value.
3. electric expansion valve pretravel control method according to claim 2, it is characterised in that the compressor performance and
Working condition includes with the corresponding relation of electronic expansion valve opening value：By the default working condition under selected compressor performance according to
Range of operation and control need to be divided into n sections region, n sections region Zhong Meiduan regions one opening value of correspondence, or by working condition
Parameter is directly fitted to curve with the corresponding relation of opening value, each working condition parameter value one opening value of correspondence.
4. a kind of electric expansion valve pretravel control method according to claim 3, it is characterised in that the default operating mode bar
Part includes inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi), exhaust saturation temperature and air-breathing saturation temperature.
5. the electric expansion valve pretravel control method according to any one of claim 1-4, it is characterised in that inhale currently
When atmospheric pressure and/or the current exhaust degree of superheat are less than preset value, then pretravel adjusting condition is met, according to preset rules to electronics
The pretravel of expansion valve is adjusted control；Pretravel adjusting condition is otherwise unsatisfactory for, directly control electric expansion valve is carried out certainly
It is dynamic to adjust.
6. electric expansion valve pretravel control method according to claim 5, it is characterised in that adjust pretravel is being met
Being adjusted control to the pretravel of electric expansion valve according to preset rules in the case of condition includes：
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is less than degree of superheat preset value Pes, then control
Electric expansion valve keeps current aperture, and continues detection until current pressure of inspiration(Pi) is more than default pressure of inspiration(Pi) disengaging value PS_outAnd
The current exhaust degree of superheat is more than default degree of superheat disengaging value PeS_out, control electric expansion valve entrance and automatically adjust；
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is more than or equal to degree of superheat preset value Pes,
The opening value of electric expansion valve is then periodically stepped up, until current pressure of inspiration(Pi) is more than default pressure of inspiration(Pi) disengaging value
PS_out, control electric expansion valve entrance and automatically adjust；
If current pressure of inspiration(Pi) is more than or equal to pressure preset PSAnd the current exhaust degree of superheat is less than degree of superheat preset value Pes,
Then periodically progressively reduce the opening value of electric expansion valve, until the current exhaust degree of superheat is more than default degree of superheat disengaging value
PeS_out, control electric expansion valve entrance and automatically adjust；
Wherein, pressure preset PSLess than default pressure of inspiration(Pi) disengaging value PS_out；Degree of superheat preset value PesLess than the default degree of superheat
Disengaging value PeS_out。
7. a kind of electric expansion valve pretravel control system, it is characterised in that include：
Pretravel estimation module, for according to the working condition of compressor performance and needs operation, obtaining the pre- of electric expansion valve
Aperture；
Pretravel setup module, by pretravel electric expansion valve is opened, and keeps Preset Time；
Pretravel adjustment module, when Preset Time is reached, judges whether to meet pretravel adjusting condition, the basis if meeting
Preset rules are adjusted control to the pretravel of electric expansion valve, until meeting pretravel exit criteria, control electronic expansion
Valve automatically adjusts；If being unsatisfactory for pretravel adjusting condition, directly control electric expansion valve and automatically adjust.
8. electric expansion valve pretravel control system according to claim 7, it is characterised in that also including pre-configured mould
Block, for pre-setting the corresponding relation of compressor performance and working condition and electronic expansion valve opening value.
9. electric expansion valve pretravel control system according to claim 8, it is characterised in that the compressor performance and
Working condition includes with the corresponding relation of electronic expansion valve opening value：By the default working condition under selected compressor performance according to
Range of operation and control need to be divided into n sections region, n sections region Zhong Meiduan regions one opening value of correspondence, or by working condition
Parameter is directly fitted to curve with the corresponding relation of opening value, each working condition parameter value one opening value of correspondence.
10. a kind of electric expansion valve pretravel control system according to claim 9, it is characterised in that the default operating mode
Condition includes inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi), exhaust saturation temperature and air-breathing saturation temperature.
The 11. electric expansion valve pretravel control systems according to any one of claim 7-10, it is characterised in that current
When pressure of inspiration(Pi) and/or the current exhaust degree of superheat are less than preset value, then pretravel adjusting condition is met, according to preset rules to electricity
The pretravel of sub- expansion valve is adjusted control；Pretravel adjusting condition is otherwise unsatisfactory for, directly control electric expansion valve is carried out
Automatically adjust.
12. electric expansion valve pretravel control systems according to claim 11, it is characterised in that adjust pretravel is met
Being adjusted control to the pretravel of electric expansion valve according to preset rules in the case of section condition includes：
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is less than degree of superheat preset value Pes, then control
Electric expansion valve keeps current aperture, and continues detection until current pressure of inspiration(Pi) is more than default pressure of inspiration(Pi) disengaging value PS_outAnd
The current exhaust degree of superheat is more than default degree of superheat disengaging value PeS_out, control electric expansion valve entrance and automatically adjust；
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is more than or equal to degree of superheat preset value Pes,
The opening value of electric expansion valve is then periodically stepped up, until current pressure of inspiration(Pi) is more than default pressure of inspiration(Pi) disengaging value
PS_out, control electric expansion valve entrance and automatically adjust；
If current pressure of inspiration(Pi) is more than or equal to pressure preset PSAnd the current exhaust degree of superheat is less than degree of superheat preset value Pes,
Then periodically progressively reduce the opening value of electric expansion valve, until the current exhaust degree of superheat is more than default degree of superheat disengaging value
PeS_out, control electric expansion valve entrance and automatically adjust；
Wherein, pressure preset PSLess than default pressure of inspiration(Pi) disengaging value PS_out；Degree of superheat preset value PesLess than the default degree of superheat
Disengaging value PeS_out。
13. a kind of electric equipments, it is characterised in that including the electric expansion valve pretravel control described in any one of claim 7-12
System processed.
14. electric equipments according to claim 13, it is characterised in that the electric equipment includes air-conditioning and freezing and refrigeration
Equipment.
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| CN201610988504.8A CN106568244B (en) | 2016-11-09 | 2016-11-09 | A kind of electric expansion valve pretravel control method, system and electrical equipment |
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| CN108317782A (en) * | 2018-02-08 | 2018-07-24 | 广东高而美制冷设备有限公司 | A kind of the tune valve method and tune valve gear of frequency conversion system memory valve body aperture |
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| CN111407123A (en) * | 2020-04-24 | 2020-07-14 | 珠海格力电器股份有限公司 | Control method for reducing temperature fluctuation, temperature control device and display cabinet |
| 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 |
| CN112503811B (en) * | 2020-12-10 | 2021-12-10 | 珠海格力电器股份有限公司 | Control method of electronic expansion valve and heat pump system |
| CN113218114A (en) * | 2021-06-04 | 2021-08-06 | 江苏拓米洛环境试验设备有限公司 | Control method of electronic expansion valve |
| CN115265012A (en) * | 2022-07-08 | 2022-11-01 | 珠海格力电器股份有限公司 | Electronic expansion valve opening control method, system and unit |
| CN115265012B (en) * | 2022-07-08 | 2024-01-12 | 珠海格力电器股份有限公司 | Electronic expansion valve opening control method, system and unit |
| CN115371305A (en) * | 2022-07-26 | 2022-11-22 | 浙江中广电器集团股份有限公司 | Method for controlling opening degree of electronic expansion valve in defrosting process |
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