CN106568244B - A kind of electric expansion valve pretravel control method, system and electrical equipment - Google Patents

A kind of electric expansion valve pretravel control method, system and electrical equipment Download PDF

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Publication number
CN106568244B
CN106568244B CN201610988504.8A CN201610988504A CN106568244B CN 106568244 B CN106568244 B CN 106568244B CN 201610988504 A CN201610988504 A CN 201610988504A CN 106568244 B CN106568244 B CN 106568244B
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China
Prior art keywords
expansion valve
pretravel
electric expansion
superheat
pressure
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CN106568244A (en
Inventor
刘雅岚
梁涛
杨崇银
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Midea Group Co Ltd
Chongqing Midea General Refrigeration Equipment Co Ltd
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Midea Group Co Ltd
Chongqing Midea General Refrigeration Equipment Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2513Expansion valves
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The present invention relates to a kind of electric expansion valve pretravel control method, system and electrical equipments, which comprises according to compressor performance and the working condition for needing to run, obtains the pretravel of electric expansion valve;Electric expansion valve is opened by pretravel, and keeps preset time;When preset time reaches, judge whether to meet pretravel adjusting condition, control is adjusted according to pretravel of the preset rules to electric expansion valve if meeting, until meeting pretravel exit criteria, control electric expansion valve automatically adjusts;If being unsatisfactory for pretravel adjusting condition, directly controls electric expansion valve and automatically adjust.The present invention is realized in unit starting, is as early as possible stablized system, is reduced unnecessary fluctuation, make unit smooth transition to stable state.

Description

A kind of electric expansion valve pretravel control method, system and electrical equipment
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 electrical equipment.
Background technique
Electric expansion valve compares mechanical throttle device with very big advantage, although cost will be avoided to higher The cumbersome 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.PI D control is widely used in electronic expansion valve controls mode, according to suction superheat or discharge superheat Target value and variation tendency, which are adjusted, keeps the system suction degree of superheat or discharge superheat finally stable near target value, But in unit starting, electric expansion valve opening speed influences, and causes aperture inadequate, and temperature change is relatively slow, pressure becomes Change comparatively fast, so that the degree of superheat adjusts distortion, a period of time just can enter stabilization after degree of superheat fluctuation, and common solution is starting It fixes electronic expansion valve opening in advance before, carries out PI D control later.
However there are limitations for fixed aperture, because under certain conditions, under the conditions of especially some extreme operating conditions, Fixed opening value and actual needs is inadequate there may be deviation or aperture or aperture is too big, and especially Unit Low opens In the case where dynamic or frequent starting, the fluctuation of electronic expansion valve opening may seriously affect unit operation, lead to unit group Low pressure or to liquid.
Summary of the invention
The technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide a kind of electric expansion valve pretravel Control method, system and electrical equipment.
The technical scheme to solve the above technical problems is that a kind of electric expansion valve pretravel control method, packet Include following steps:
According to compressor performance and the working condition for needing to run, the pretravel of electric expansion valve is obtained;
Electric expansion valve is opened by pretravel, and keeps preset time;
When preset time reaches, judge whether to meet pretravel adjusting condition, according to preset rules pair if meeting Control is adjusted in the pretravel of electric expansion valve, until meeting pretravel exit criteria, control electric expansion valve carries out automatic It adjusts;If being unsatisfactory for pretravel adjusting condition, directly controls electric expansion valve and automatically adjust.
The beneficial effects of the present invention are: the present invention is by unit starting, first according to compressor performance and operating condition item Part estimate electric expansion valve pretravel, and keep pretravel run preset time, but pretravel and actual needs there may be Deviation, therefore in the case where meeting pretravel adjusting condition, pretravel is manually adjusted, is exited until meeting pretravel Condition;If having met actual needs after keeping pretravel operation preset time, then directly controls electric expansion valve and carry out automatically It adjusts;The present invention is realized in unit starting, is as early as possible stablized system, is reduced unnecessary fluctuation, make unit smooth transition To stable state.
Based on the above technical solution, the present invention can also be improved as follows.
Further, above-mentioned technical proposal further includes presetting compressor performance and working condition and electronic expansion valve opening The corresponding relationship of value.
Beneficial effect using above-mentioned further scheme is: the present invention is by presetting compressor performance and electronic expansion The corresponding relationship of valve opening value can quickly be estimated to obtain electricity according to compressor performance when estimating the pretravel of electric expansion valve The pretravel of sub- expansion valve.
Further, the compressor performance and working condition and the corresponding relationship of electronic expansion valve opening value include: by institute The default working condition under compressor performance is selected to need to be divided into n sections of regions, the n sections of regions area Zhong Meiduan according to range of operation and control Domain corresponds to an opening value, or the corresponding relationship of working condition parameter and opening value is directly fitted to curve, each work Condition condition parameter values correspond to an opening value.
Beneficial effect using above-mentioned further scheme is: electric expansion valve pretravel is according to compressor performance in the present invention And the method for combining actual operating mode segmentation assignment or curve matching confirms opening value, may be implemented quickly to estimate electronic expansion The pretravel of valve.
Further, the default working condition includes inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi), is vented and satisfies With temperature and air-breathing saturation temperature.
Beneficial effect using above-mentioned further scheme is: inlet and outlet temperature is consistent before compressor start, Suck and exhaust pressure Balance, therefore temperature can be saturated by inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi), exhaust saturation temperature and air-breathing The pretravel of the parameter Estimations 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 meet pretravel adjusting Control is adjusted according to pretravel of the preset rules to electric expansion valve in condition;Otherwise it is unsatisfactory for pretravel adjusting condition, directly Control electric expansion valve is connect to automatically adjust.
Using the beneficial effect of above-mentioned further scheme is: 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 preset rules to the aperture of electric expansion valve Value is manually adjusted, until meeting pretravel exit criteria, then is carried out automatically controlling, if two parameters are not low directly It carries out automatically controlling.
Further, in the case where meeting pretravel adjusting condition according to preset rules to the pretravel of electric expansion valve into Row adjusts control
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 It controls electric expansion valve and keeps current aperture, and continue to test until current pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) disengaging value PS_outAnd the current exhaust degree of superheat is greater than default degree of superheat disengaging value PeS_out, control electric expansion valve and enter automatic adjustment;
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 it is periodically stepped up the opening value of electric expansion valve, until current pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) and exits Value PS_out, control electric expansion valve and enter automatic adjustment;
If current pressure of inspiration(Pi) is greater 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 gradually reduced, until the current exhaust degree of superheat is greater than the default degree of superheat and exits Value PeS_out, control electric expansion valve and enter automatic adjustment;
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
Beneficial effect using above-mentioned further scheme is: this invention ensures that unit is in current pressure of inspiration(Pi) and is vented Under the too low working condition of temperature, or in current pressure of inspiration(Pi) under the normal working condition of too low and discharge superheat, or Under the working condition that person is normal in current pressure of inspiration(Pi) and discharge superheat is too low, unit can smoothly transit to automatic control, Fluctuation is reduced, the risk of generator protection is reduced, makes unit reliability service.
For achieving the above object, the present invention also provides a kind of electric expansion valve pretravel control systems, comprising:
Pretravel estimation module, for obtaining electric expansion valve according to compressor performance and the working condition for needing to run Pretravel;
Pretravel setup module opens electric expansion valve by pretravel, and keeps preset time;
Pretravel adjustment module judges whether to meet pretravel adjusting condition when preset time reaches, if meeting Control is adjusted according to pretravel of the preset rules to electric expansion valve, until meeting pretravel exit criteria, controls electronics Expansion valve automatically adjusts;If being unsatisfactory for pretravel adjusting condition, directly controls electric expansion valve and automatically adjust.
Based on the above technical solution, the present invention can also be improved as follows.
Above-mentioned technical proposal further includes provisioning module, swollen with electronics for presetting compressor performance and working condition The corresponding relationship of swollen valve opening value.
Further, the compressor performance and working condition and the corresponding relationship of electronic expansion valve opening value include: by institute The default working condition under compressor performance is selected to need to be divided into n sections of regions, the n sections of regions area Zhong Meiduan according to range of operation and control Domain corresponds to an opening value, or the corresponding relationship of working condition parameter and opening value is directly fitted to curve, each work Condition condition parameter values correspond to an opening value.
Further, the default working condition includes inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi), is vented and satisfies 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 meet pretravel adjusting Control is adjusted according to pretravel of the preset rules to electric expansion valve in condition;Otherwise it is unsatisfactory for pretravel adjusting condition, directly Control electric expansion valve is connect to automatically adjust.
Further, in the case where meeting pretravel adjusting condition according to preset rules to the pretravel of electric expansion valve into Row adjusts control
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 It controls electric expansion valve and keeps current aperture, and continue to test until current pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) disengaging value PS_outAnd the current exhaust degree of superheat is greater than default degree of superheat disengaging value PeS_out, control electric expansion valve and enter automatic adjustment;
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 it is periodically stepped up the opening value of electric expansion valve, until current pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) and exits Value PS_out, control electric expansion valve and enter automatic adjustment;
If current pressure of inspiration(Pi) is greater 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 gradually reduced, until the current exhaust degree of superheat is greater than the default degree of superheat and exits Value PeS_out, control electric expansion valve and enter automatic adjustment;
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 electrical equipments, including electricity described in above-mentioned technical proposal Sub- expansion valve pretravel control system.
Further, the electrical equipment includes air-conditioning, Teat pump boiler and refrigerating equipment.
Detailed description of the invention
Fig. 1 is a kind of electric expansion valve pretravel control method flow chart that the embodiment of the present invention 1 provides;
Fig. 2 is the inflow temperature and electronic expansion valve opening value correspondence diagram that the embodiment of the present invention 2 provides;
Fig. 3 is a kind of electric expansion valve pretravel control method flow chart that the embodiment of the present invention 2 provides;
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 electrical equipment schematic diagram provided in an embodiment of the present invention.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and It is non-to be used to limit the scope of the 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 obtains the pretravel of electric expansion valve according to compressor performance and the working condition for needing to run;It is described pre- to open Initial opening when degree is electric expansion valve starting;
S2 opens electric expansion valve by pretravel, and keeps preset time;
S3 judges whether to meet pretravel adjusting condition when preset time reaches, 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 controls electric expansion valve and automatically adjust.
The present invention is by estimating the pre- of electric expansion valve according to compressor performance and working condition first in unit starting Aperture, and keep pretravel to run preset time, but there may be deviations for pretravel and actual needs, therefore are meeting pretravel In the case where adjusting condition, pretravel is manually adjusted, until meeting pretravel exit criteria;If keeping pretravel fortune After row preset time, actual needs is met, has then directly controlled electric expansion valve and automatically adjust;The present invention is realized in machine When group starting, as early as possible stablizes system, reduce unnecessary fluctuation, make unit smooth transition to stable state.
Adjusting according to the opening value after pretravel operation preset time can supplement according to service condition, delete, or pre- Being directly entered automatic adjustment, especially bad working environments after the completion of aperture can achieve good effect.
It further include presetting compressor performance and working condition and electronic expansion valve opening value in the embodiment of the present invention Corresponding relationship, because its performance of the compressor of different model is different, the operating condition range that different compressors adapt to is different, such as wraps Worst cold case, room temperature operating condition and worst hot case etc. are included, under different working conditions, the pretravel of electric expansion valve is different, because This presets the aperture of compressor performance and the electric expansion valve under different working conditions;The present invention is by presetting compression The corresponding relationship of machine performance and working condition and electronic expansion valve opening value, can estimate electric expansion valve pretravel when root Quickly estimate to obtain the pretravel of electric expansion valve according to compressor performance.
Specifically, the compressor performance and working condition and the corresponding relationship of electronic expansion valve opening value include: by institute The default working condition under compressor performance is selected to need to be divided into n sections of regions, degree of taking away a according to range of operation and control1、a2、a3、 a4、a5……an, the corresponding opening value in the n sections of regions region Zhong Meiduan, or by working condition parameter pass corresponding with opening value System is directly fitted to curve, the corresponding opening value of each working condition parameter value.Joined in S1 according to current compressor performance Region belonging to numerical value or the corresponding opening value of the position acquisition on curve, and the opening value that will acquire is 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.
It includes inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi) that working condition is preset described in the embodiment of the present invention Power, exhaust saturation temperature and air-breathing saturation temperature.Inlet and outlet temperature is consistent before compressor start, Suck and exhaust pressure balance, therefore Inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi), the exhaust parameters such as saturation temperature and air-breathing saturation temperature can be passed through 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 meet pretravel tune Control is adjusted to electric expansion valve according to preset rules in section condition;Otherwise it is unsatisfactory for pretravel adjusting condition, controls electronics Expansion valve automatically adjusts.The present invention is using current pressure of inspiration(Pi) and the current exhaust degree of superheat as reference frame, when any one When a too low, manually adjusted according to opening value of the preset rules to electric expansion valve, until meet pretravel exit criteria, It carries out automatically controlling, is directly carried out automatically controlling if two parameters are not low again.
It is adjusted in the case where meeting pretravel adjusting condition according to pretravel of the preset rules to electric expansion valve 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 It controls electric expansion valve and keeps current aperture, and continue to test until current pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) disengaging value PS_outAnd the current exhaust degree of superheat is greater than default degree of superheat disengaging value PeS_out, control electric expansion valve and enter automatic adjustment.This In too low (when being respectively less than preset value) that current pressure of inspiration(Pi) and current exhaust overheat, control electric expansion valve is protected for invention It holds current aperture to be failure to actuate, until exiting manually when current pressure of inspiration(Pi) and the current exhaust degree of superheat are all larger than default disengaging value It adjusts, into automatic adjustment;This invention ensures that the operating condition that unit is too low in current pressure of inspiration(Pi) and the current exhaust degree of superheat Under the conditions of, automatic control is smoothly transitted to, fluctuation is reduced, reduces the risk of generator protection, 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 it is periodically stepped up the opening value of electric expansion valve, until current pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) and exits Value PS_out, control electric expansion valve and enter automatic adjustment.The present invention is too low in current pressure of inspiration(Pi) 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 greater than or equal to preset value), periodically gradually increase Add the opening value of electric expansion valve, specifically each cycle tc increases aperture a%, and the incrementss of each cycle can not also wait, according to root Factually actual value and target value difference is exited to determine, difference is bigger, and incrementss are bigger, and the smaller incrementss of difference are smaller;Work as pressure of inspiration(Pi) When power is greater than default pressure of inspiration(Pi) disengaging value, exits and manually adjust, into automatic adjustment;This invention ensures that unit is inhaled currently Under atmospheric pressure is too low and the normal working condition of the current exhaust degree of superheat, automatic control is smoothly transitted to, reduces fluctuation, reduces machine The risk of group protection, makes unit reliability service.
If current pressure of inspiration(Pi) is greater 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 gradually reduced, until the current exhaust degree of superheat is greater than the default degree of superheat and exits Value PeS_out, control electric expansion valve and enter automatic adjustment.The present invention is normal in current pressure of inspiration(Pi) and current exhaust overheat is spent When low (i.e. current pressure of inspiration(Pi) is greater than or equal to preset value, when the current exhaust degree of superheat is less than preset value), periodically gradually subtract The opening value of small electric expansion valve, specifically each cycle tc reduces aperture b%, and the reduction amount of each cycle can not also wait, according to root Factually actual value and target value difference is exited to determine, difference is bigger, and reduction amount is bigger, and the smaller reduction amount of difference is smaller, until current Discharge superheat is greater than default degree of superheat disengaging value, exits and manually adjusts, into automatic adjustment.This invention ensures that unit is being worked as Under the working condition that preceding pressure of inspiration(Pi) is normal and the current exhaust degree of superheat is too low, automatic control is smoothly transitted to, 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 are with the pretravel of certain model compressor inflow temperature estimation electric expansion valve Example illustrates the technical solution of the embodiment of the present invention.
As shown in Figure 2,3, inflow temperature is needed to be divided into n sections of areas according to range of operation and control in the embodiment of the present invention Domain, degree of taking away a1、a2、a3、a4、a5……an, the corresponding opening value in the n sections of regions region Zhong Meiduan, or working condition is joined Several corresponding relationships with opening value are directly fitted to curve, the corresponding opening value of each working condition parameter value, and conduct Pretravel.
Control executes corresponding pretravel, and after keeping preset time t, the temperature, pressure of unit operation tends towards stability.
But the pretravel and actual conditions determined need there may be deviation, if pretravel executes preset time t Afterwards, current pressure of inspiration(Pi) is too low, is less than pressure preset PS, to prevent fluctuation from causing to protect, still maintain manual;
If current pressure of inspiration(Pi) is less than pressure preset PS, and discharge superheat is greater 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 greater than default Pressure of inspiration(Pi) disengaging value PS_outBacked off after random is manual, into automatic adjustment;
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 greater than default pressure of inspiration(Pi) disengaging value PS_outAnd discharge superheat Degree is greater than default degree of superheat disengaging value Pes_outBacked off after random is manual;
If pretravel executes preset time tcAfterwards, the current exhaust degree of superheat is less than degree of superheat preset value Pes, to prevent wave It is dynamic to cause to protect, it still maintains 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 greater than default degree of superheat disengaging value Pes_outBacked off after random is manual, into automatic adjustment.
As shown in figure 4, the embodiment of the present invention also provides a kind of electric expansion valve pretravel control system, comprising:
Pretravel estimation module, for obtaining electric expansion valve according to compressor performance and the working condition for needing to run Pretravel;
Pretravel setup module for opening electric expansion valve by pretravel, and keeps preset time;
Pretravel adjustment module, for judging whether to meet pretravel adjusting condition when preset time reaches, if full It is sufficient then control is adjusted according to pretravel of the preset rules to electric expansion valve, until meeting pretravel exit criteria, control Electric expansion valve automatically adjusts;If being unsatisfactory for pretravel adjusting condition, directly controls electric expansion valve and carry out automatically It adjusts.
Above-mentioned technical proposal further includes provisioning module, swollen with electronics for presetting compressor performance and working condition The corresponding relationship of swollen valve opening value.
Specifically, the compressor performance and working condition and the corresponding relationship of electronic expansion valve opening value include: by institute The default working condition under compressor performance is selected to need to be divided into n sections of regions, the n sections of regions area Zhong Meiduan according to range of operation and control Domain corresponds to an opening value, or the corresponding relationship of working condition parameter and opening value is directly fitted to curve, each work Condition condition parameter values correspond to an opening value.
It includes inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi) that working condition is preset described in the embodiment of the present invention 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 When preset value, then meet pretravel adjusting condition, control is adjusted according to pretravel of the preset rules to electric expansion valve;It is no It is then unsatisfactory for pretravel adjusting condition, control electric expansion valve automatically adjusts.
It is adjusted in the case where meeting pretravel adjusting condition according to pretravel of the preset rules to electric expansion valve 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 It controls electric expansion valve and keeps current aperture, and continue to test until current pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) disengaging value PS_outAnd the current exhaust degree of superheat is greater than default degree of superheat disengaging value PeS_out, control electric expansion valve and enter automatic adjustment.This In too low (when being respectively less than preset value) that current pressure of inspiration(Pi) and current exhaust overheat, control electric expansion valve is protected for invention Current aperture is held to be failure to actuate, until exit and manually adjust when current pressure of inspiration(Pi) and discharge superheat are all larger than default disengaging value, Into automatic adjustment;This invention ensures that the working condition that unit is too low in current pressure of inspiration(Pi) and the current exhaust degree of superheat Under, automatic control is smoothly transitted to, fluctuation is reduced, reduces the risk of generator protection, make unit reliability service.
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is greater than degree of superheat preset value Pes, then It is periodically stepped up the opening value of electric expansion valve, until current pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) disengaging value PS_out, Control electric expansion valve enters automatic adjustment.The present invention is too low in current pressure of inspiration(Pi) and the current exhaust degree of superheat normally (is worked as Preceding pressure of inspiration(Pi) is less than preset value, when the current exhaust degree of superheat is greater than preset value) when, periodically it is stepped up electric expansion valve Opening value, specifically each cycle tc increases aperture a%, when pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) disengaging value, exits manually It adjusts, into automatic adjustment;This invention ensures that unit is too low in current pressure of inspiration(Pi) and the normal work of the current exhaust degree of superheat Under the conditions of condition, automatic control is smoothly transitted to, fluctuation is reduced, reduces the risk of generator protection, make unit reliability service.
If current pressure of inspiration(Pi) is greater than pressure preset PSAnd the current exhaust degree of superheat is less than degree of superheat preset value Pes, then The opening value of electric expansion valve is periodically gradually reduced, until the current exhaust degree of superheat is greater than default degree of superheat disengaging value PeS_out, Control electric expansion valve enters automatic adjustment.The present invention is normal in current pressure of inspiration(Pi) and the current exhaust degree of superheat is too low (works as Preceding pressure of inspiration(Pi) is greater than preset value, when the current exhaust degree of superheat is less than preset value) when, periodically gradually reduce electric expansion valve Opening value, specifically each cycle tc reduces aperture a%, until the current exhaust degree of superheat is greater than default degree of superheat disengaging value, exits It manually adjusts, into automatic adjustment.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 automatic control, reduce fluctuation, reduce the risk of generator protection, 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 electrical equipment, including electric expansion valve as described in example 4 Pretravel control system.Electrical 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 compressor performance and the operating condition item for needing to run Part obtains the pretravel of electric expansion valve;Pretravel setup module for opening electric expansion valve by pretravel, and keeps pre- If the time;Pretravel adjustment module, for judging whether to meet pretravel adjusting condition when preset time reaches, if full It is sufficient then control is adjusted according to pretravel of the preset rules to electric expansion valve, until meeting pretravel exit criteria, control Electric expansion valve automatically adjusts;If being unsatisfactory for pretravel adjusting condition, directly controls electric expansion valve and carry out automatically It adjusts.
Above-mentioned technical proposal further includes provisioning module, swollen with electronics for presetting compressor performance and working condition The corresponding relationship of swollen valve opening value.Specifically, the compressor performance and working condition are corresponding with electronic expansion valve opening value Relationship includes: to need to be divided into n sections of regions, n according to range of operation and control for the default working condition under selected compressor performance The corresponding opening value in the section region region Zhong Meiduan, or the corresponding relationship of working condition parameter and opening value is directly fitted to Curve, the corresponding opening value of each working condition parameter value.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 meet pretravel adjusting condition, root Control is adjusted according to pretravel of the preset rules to electric expansion valve;Otherwise it is unsatisfactory for pretravel adjusting condition, controls electronics Expansion valve automatically adjusts.
It is adjusted in the case where meeting pretravel adjusting condition according to pretravel of the preset rules to electric expansion valve If control includes: that 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, It then controls electric expansion valve and keeps current aperture, and continue to test until current pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) disengaging value PS_outAnd the current exhaust degree of superheat is greater than default degree of superheat disengaging value PeS_out, control electric expansion valve and enter automatic adjustment;Such as The current pressure of inspiration(Pi) of fruit is less than pressure preset PSAnd the current exhaust degree of superheat is greater than degree of superheat preset value Pes, then periodically gradually Increase the opening value of electric expansion valve, until current pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) disengaging value PS_out, it is swollen to control electronics Swollen valve enters automatic adjustment;If current pressure of inspiration(Pi) is greater 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 gradually reduced, until the current exhaust degree of superheat is greater than default degree of superheat disengaging value PeS_out, control electric expansion valve and enter automatic adjustment.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 may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure Member and algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware With the interchangeability of software, each exemplary composition and step are generally described according to function in the above description.This A little functions are implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Specially Industry technical staff can use different methods to achieve the described function each specific application, but this realization is not It is considered as beyond the scope of this invention.
It is apparent to those skilled in the art that for convenience of description and succinctly, foregoing description is The specific work process of system, device and unit, can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the division of unit, Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be with In conjunction with or be desirably integrated into another system, or some features can be ignored or not executed.
Unit may or may not be physically separated as illustrated by the separation member, shown as a unit Component may or may not be physical unit, it can and it is in one place, or may be distributed over multiple networks On unit.It can select some or all of unit therein according to the actual needs to realize the mesh of the embodiment of the present invention 's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit It is that each unit physically exists alone, is also possible to two or more units and is integrated in one unit.It is above-mentioned integrated Unit both can take the form of hardware realization, can also realize in the form of software functional units.
It, can if integrated unit is realized in the form of SFU software functional unit and when sold or used as an independent product To be stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention substantially or Say that all or part of the part that contributes to existing technology or the technical solution can embody in the form of software products Out, which is stored in a storage medium, including some instructions are used so that a computer equipment (can be personal computer, server or the network equipment etc.) executes all or part of each embodiment method of the present invention Step.And storage medium above-mentioned include: USB flash disk, it is mobile hard disk, read-only memory (ROM, Read-Only Memory), random Access various Jie that can store program code such as memory (RAM, Random Access Memory), magnetic or disk 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 specific features, structure, material or spy described in conjunction with this embodiment or example Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples It closes and combines.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.

Claims (12)

1. a kind of electric expansion valve pretravel control method, which comprises the steps of:
According to compressor performance and the working condition for needing to run, the pretravel of electric expansion valve is obtained;
Electric expansion valve is opened by pretravel, and keeps preset time;
When preset time reaches, judge whether to meet pretravel adjusting condition, according to preset rules to electronics if meeting Control is adjusted in the pretravel of expansion valve, until meeting pretravel exit criteria, control electric expansion valve automatically adjusts; If being unsatisfactory for pretravel adjusting condition, directly controls electric expansion valve and automatically adjust;
Control is adjusted according to pretravel of the preset rules to electric expansion valve in the case where meeting pretravel adjusting condition Include:
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 to test until current pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) disengaging value PS_outAnd The current exhaust degree of superheat is greater than default degree of superheat disengaging value PeS_out, control electric expansion valve and enter automatic adjustment;
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is greater than or equal to degree of superheat preset value Pes, It is then periodically stepped up the opening value of electric expansion valve, until current pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) disengaging value PS_out, control electric expansion valve and enter automatic adjustment;
If current pressure of inspiration(Pi) is greater than or equal to pressure preset PSAnd the current exhaust degree of superheat is less than degree of superheat preset value Pes, The opening value of electric expansion valve is then periodically gradually reduced, until the current exhaust degree of superheat is greater than default degree of superheat disengaging value PeS_out, control electric expansion valve and enter automatic adjustment;
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
2. electric expansion valve pretravel control method according to claim 1, which is characterized in that further include presetting pressure The corresponding relationship of contracting machine performance and working condition and electronic expansion valve opening value.
3. electric expansion valve pretravel control method according to claim 2, which is characterized in that the compressor performance and The corresponding relationship of working condition and electronic expansion valve opening value include: by the default working condition under selected compressor performance according to Range of operation and control need to be divided into n sections of regions, the corresponding opening value in the n sections of regions region Zhong Meiduan, or by working condition The corresponding relationship of parameter and opening value is directly fitted to curve, the corresponding opening value of each working condition parameter value.
4. a kind of electric expansion valve pretravel control method according to claim 3, which is characterized in that the default operating condition item Part includes inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi), exhaust saturation temperature and air-breathing saturation temperature.
5. electric expansion valve pretravel control method according to claim 1-4, which is characterized in that inhaled currently When atmospheric pressure and/or the current exhaust degree of superheat are less than preset value, then meet pretravel adjusting condition, according to preset rules to electronics Control is adjusted in the pretravel of expansion valve;Otherwise it is unsatisfactory for pretravel adjusting condition, electric expansion valve is directly controlled and carries out certainly It is dynamic to adjust.
6. a kind of electric expansion valve pretravel control system characterized by comprising
Pretravel estimation module, for obtaining the pre- of electric expansion valve according to compressor performance and the working condition for needing to run Aperture;
Pretravel setup module opens electric expansion valve by pretravel, and keeps preset time;
Pretravel adjustment module, preset time reach when, judge whether to meet pretravel adjusting condition, if meet if basis Control is adjusted to the pretravel of electric expansion valve in preset rules, until meeting pretravel exit criteria, controls electronic expansion Valve automatically adjusts;If being unsatisfactory for pretravel adjusting condition, directly controls electric expansion valve and automatically adjust;
Control is adjusted according to pretravel of the preset rules to electric expansion valve in the case where meeting pretravel adjusting condition Include:
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 to test until current pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) disengaging value PS_outAnd The current exhaust degree of superheat is greater than default degree of superheat disengaging value PeS_out, control electric expansion valve and enter automatic adjustment;
If current pressure of inspiration(Pi) is less than pressure preset PSAnd the current exhaust degree of superheat is greater than or equal to degree of superheat preset value Pes, It is then periodically stepped up the opening value of electric expansion valve, until current pressure of inspiration(Pi) is greater than default pressure of inspiration(Pi) disengaging value PS_out, control electric expansion valve and enter automatic adjustment;
If current pressure of inspiration(Pi) is greater than or equal to pressure preset PSAnd the current exhaust degree of superheat is less than degree of superheat preset value Pes, The opening value of electric expansion valve is then periodically gradually reduced, until the current exhaust degree of superheat is greater than default degree of superheat disengaging value PeS_out, control electric expansion valve and enter automatic adjustment;
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. electric expansion valve pretravel control system according to claim 6, which is characterized in that further include being pre-configured mould Block, for presetting the corresponding relationship of compressor performance and working condition and electronic expansion valve opening value.
8. electric expansion valve pretravel control system according to claim 7, which is characterized in that the compressor performance and The corresponding relationship of working condition and electronic expansion valve opening value include: by the default working condition under selected compressor performance according to Range of operation and control need to be divided into n sections of regions, the corresponding opening value in the n sections of regions region Zhong Meiduan, or by working condition The corresponding relationship of parameter and opening value is directly fitted to curve, the corresponding opening value of each working condition parameter value.
9. a kind of electric expansion valve pretravel control system according to claim 8, which is characterized in that the default operating condition item Part includes inflow temperature, leaving water temperature, pressure at expulsion, pressure of inspiration(Pi), exhaust saturation temperature and air-breathing saturation temperature.
10. according to the described in any item electric expansion valve pretravel control systems of claim 6-9, which is characterized in that current When pressure of inspiration(Pi) and/or the current exhaust degree of superheat are less than preset value, then meet pretravel adjusting condition, according to preset rules to electricity Control is adjusted in the pretravel of sub- expansion valve;Otherwise it is unsatisfactory for pretravel adjusting condition, directly controls electric expansion valve progress Automatic adjustment.
11. a kind of electrical equipment, which is characterized in that including the described in any item electric expansion valve pretravel controls of claim 6-10 System processed.
12. electrical equipment according to claim 11, which is characterized in that the electrical equipment includes air-conditioning and freezing and refrigeration Equipment.
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