CN103836861A - Expansion Valve Position Control Systems And Methods - Google Patents

Expansion Valve Position Control Systems And Methods Download PDF

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Publication number
CN103836861A
CN103836861A CN201310590547.7A CN201310590547A CN103836861A CN 103836861 A CN103836861 A CN 103836861A CN 201310590547 A CN201310590547 A CN 201310590547A CN 103836861 A CN103836861 A CN 103836861A
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CN
China
Prior art keywords
compressor
control signal
expansion valve
load
preload
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Pending
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CN201310590547.7A
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Chinese (zh)
Inventor
林之勇
丹尼尔·J·舒特
贝内迪克特·J·多尔奇赫
罗杰·诺尔
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Vertiv Corp
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Liebert Corp
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Publication of CN103836861A publication Critical patent/CN103836861A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
    • H05K7/20718—Forced ventilation of a gaseous coolant
    • H05K7/20745—Forced ventilation of a gaseous coolant within rooms for removing heat from cabinets, e.g. by air conditioning device
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
    • H05K7/20836—Thermal management, e.g. server temperature control
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/06—Several compression cycles arranged in parallel
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • 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
    • F25B2600/01—Timing
    • 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
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • 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
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0253—Compressor control by controlling speed with variable speed
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
    • 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)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

A system includes a load module, a comparison module and a control module. The load module is configured to determine a current load of a compressor. The comparison module is configured to compare the current load to a previous load of the compressor to generate a comparison signal based on the comparison. The control module is configured to generate (i) a first control signal based on a superheat value of the compressor, and (ii) a second control signal based on the current load and the previous load. The control module is configured to, based on the comparison signal, control a position of an expansion valve according to either the first control signal or the second control signal.

Description

Expansion valve position control system and method
The cross reference of related application
The application requires the priority of No. 61/729029th, the U.S. Provisional Application of submitting on November 21st, 2012, and whole disclosures of above-mentioned application are incorporated herein by reference.
Technical field
The disclosure relates to cooling system, more particularly, relates to expansion valve control system.
Background technology
This section provides and relates to the not necessarily background information of the present disclosure of prior art.
Cooling system is applicable to wherein want the many different application of cooling fluid.Fluid may be the liquid of the gas of for example air or for example water.Example application comprises for cooling heat supply, ventilation, air-conditioning (HVAC) system and data center's atmosphere control system are carried out in the space at the people places such as such as office.Data center can refer to the room with some electronic equipments such as such as computer servers.
In Fig. 1, show the air-conditioning 50 that can use in machine room for example.Air-conditioning 50 comprises cooling circuit 51 and rack 52.Cooling circuit 51 is disposed in rack 52 and comprises evaporimeter 54, air moving device 56, compressor 58, condenser 60 and expansion valve 62.Evaporimeter 54, compressor 58, condenser 60 and expansion valve 62 are for example connected to, in the closed loop that cooling fluid (phase change refrigerant) circulates therein.Evaporimeter 54 can comprise having the V-arrangement of multiple cooling fins or A shape coil pack so that the cooling capacity of increase to be provided.Evaporimeter 54 receives cooling fluid and by cooling the air of the opening of the evaporimeter 54 of flowing through.For example fan of air moving device 56(or centrifugal blower) from the entrance (not shown) air amount in rack 52 and through evaporimeter 54.Cooling air exports in the cavity 64 rack 52 from evaporimeter 54.
Compressor 58 cycles through cooling fluid condenser 60, expansion valve 62, evaporimeter 54 and returns to compressor 58.Compressor 58 can be for example scroll compressor.Scroll compressor can be constant speed compressor, digital speed compressor or variable speed compressor.Scroll compressor generally includes two skew helical disks.The first helical disk is stationary disk or quiet whirlpool dish.The second helical disk is movable orbiting scroll.Cooling fluid is received in the porch of scroll compressor, between skew helical disk, is hunted down, compressed and towards condenser 60 center (or outlet) locate to be discharged.Condenser 60 can be by the micro-channel condenser cooling cooling fluid receiving from compressor 58.Expansion valve 62 can be electric expansion valve and cooling fluid is expanded out to steam from for example liquid from condenser 60.
The suction superheat value of compressor 58 is controlled in position (or opening percentage of expansion valve) that can variable expansion valve 62.The superheat value of compressor equals compressor inlet temperature and deducts the saturated inlet temperature of compressor.Compressor suction pressure can be for determining the saturated inlet temperature of compressor.Can determine compressor inlet temperature and compressor suction pressure by the signal based on carrying out the corresponding sensor of connection between comfortable evaporimeter 54 and compressor 58.Superheat value refers to the temperature of the cooling fluid under gaseous state is heated to the amount more than saturated inlet temperature of compressor.
Superheat value can be used for the position of modulation (or adjusting) expansion valve 62.The control of the position (or opening percentage) of expansion valve 62 can be carried out by PID (PID) control module.Pid control module control superheat value is to match with constant predetermined superheat setpoint.The efficiency that this guarantees compressor reliability and improves compressor.
Summary of the invention
This section provides overall summary of the present disclosure, but not discloses its four corner or its all features comprehensively.
In one aspect, provide a kind of system, this system comprises load module, comparison module and control module.Load block configuration is to determine the preload of working as of compressor.Comparison module is configured to compare to generate based on the comparison comparison signal when the first preload of preload and compressor.Control module is configured to the (i) superheat value based on compressor and generates the first control signal, and (ii) generates the second control signal based on working as preload and first preload.Control module is configured to, according to the first control signal or the second control signal, the based on the comparison position of signal controlling expansion valve.
In yet another aspect, provide a kind of system, this system comprises load module and control module.Load block configuration is to detect the variation of the load of compressor.Control module is configured to the (i) superheat value based on compressor and generates PID (PID) control signal, and (ii) the variation based on load generates expansion valve control signal.Control module is configured to, and in response to the variation of load, is to control the position of expansion valve according to expansion valve control signal from control the position transition of expansion valve according to pid control signal.
In yet another aspect, provide a kind of method, the method comprises determines working as preload and comparing when the first preload of preload and compressor of compressor.Generate based on the comparison comparison signal.Signal based on the comparison, the method also comprises: the superheat value based on compressor generates the first control signal and according to the position of the first control signal control expansion valve; Or based on when preload with first preload generates the second control signal and according to the position of the second control signal control expansion valve.
In addition,, according to the description providing herein, it is obvious that the field of application will become.Description in this summary of the invention and concrete example are only intended to the object of explanation and are not intended to limit the scope of the disclosure.
Accompanying drawing explanation
Accompanying drawing described herein is only for selected embodiment but not the illustrative object of all possible embodiment, and is not intended to limit the scope of the disclosure.
Fig. 1 is the perspective view of the air-conditioning of prior art;
Fig. 2 is the schematic diagram that is incorporated to the multistage cooling system of cooling control module according to an aspect of the present disclosure;
Fig. 3 is according to the functional block diagram of the overheated regulator control system of an aspect of the present disclosure; And
Fig. 4 is the logical flow chart illustrating according to the overheated regulate and control method of an aspect of the present disclosure.
In some figure in the accompanying drawings, corresponding Reference numeral represents corresponding part.
The specific embodiment
With reference to accompanying drawing, example embodiment is more fully described.
Can control with pid control module the electric expansion valve (EEV) of air-conditioning system and/or cooling circuit.Pid control module can be based on compressor the position (or opening percentage) of variation control (being sometimes called as modulation) EEV of superheat value.
Pid control module has the delay being associated in the time of the variation of response superheat value.When compressor is with constant load operation or in the variation while being less than predetermined amount of predetermined time section load, this delay can not throw into question.Within compressor is greater than the mechanical load and unloaded During of predetermined amount, the response speed of pid control module may be fast not.For example, in the time that operation has the digital scroll compressor of cylinder discharge mechanism or semi-closed compressor, may there is this kind of situation.
Owing to the response of the delay of pid control module, pid control module can overshoot superheat setpoint provide high overheated overshoot state or low overheated overshoot state thus.In addition, the response of delay also can provide low compression ratio (or pressure differential).The pressure differential of compressor refers to the poor of the inlet pressure of compressor or suction pressure and outlet pressure or discharge pressure.The low pressure difference difference of predetermined difference (or be less than) may cause compressor damage, compressor fault and/or compressor and/or system works unstable.
Embodiment disclosed herein provides the quick EEV control technology of crossing thermal conditioning being included in during compressor load and Light Condition.This embodiment comprises that the multiple heat control methods of crossing of use (i) occur high overheated overshoot and low overheated overshoot state and the (ii) generation of low compression ratio to stop.
In Fig. 2, show the schematic diagram of cooling system 100.Cooling system 100 comprises the upstream cooling class 102 of (or first) cooling circuit 104 that has upstream and has downstream (or second) cooling class 106 of downstream cooling circuit 108.Cooling circuit 104, cooling circuit 108 are controlled by cooling control module 109.Although show two cooling circuits, also can comprise the cooling circuit of varying number.Upstream cooling circuit 104 comprises the first evaporimeter 110, the first expansion valve 112, the first condenser 114, the first compressor 116 and the second compressor 118.Downstream cooling circuit 108 comprises the second evaporimeter 120, the second expansion valve 122, the second condenser 124, the 3rd compressor 126 and the 4th compressor 128.Evaporimeter 110, evaporimeter 120 have evaporator fan 130, evaporator fan 132 separately or have serially public fan.Condenser 114, condenser 124 have condenser fan 134, condenser fan 136 separately or have serially public fan.
Cooling control module 109 can generate condenser fan signal COND1, condenser fan signal COND2, evaporator fan signal EVAP1, evaporator fan signal EVAP2, expansion valve signal EXP1, expansion valve signal EXP2 and signal compressor PWM1, signal compressor PWM2, signal compressor PWM3, signal compressor PWM4 controls fan 130, fan 132, fan 134, fan 136, expansion valve 112, expansion valve 122 and compressor 116, compressor 118, compressor 126, compressor 128.
Cooling control module 109 can be based on control fan 130, fan 132, fan 134, fan 136, expansion valve 112, expansion valve 122 and/or compressor 116, compressor 118, compressor 126, compressor 128 from the signal of various sensors.Sensor can comprise for example environment temperature sensor 150, suction pressure sensor 152, suction pressure sensor 154, discharge pressure sensor 156, discharge pressure sensor 158 and/or suction port of compressor (or evaporator outlet) temperature sensor 160, suction port of compressor (or evaporator outlet) temperature sensor 162.Environment temperature sensor 150 can be outdoor environment temperature sensor and build environment temperature signal TA.Pressure sensor 152, pressure sensor 154 generate suction pressure signal SUC1, suction pressure signal SUC2 and detect the pressure of the fluid being received by compressor 116, compressor 118, compressor 126, compressor 128.Discharge pressure sensor 156, discharge pressure sensor 158 generate discharge pressure (or blowdown presssure) signal HEAD1, discharge pressure (or blowdown presssure) signal HEAD2 and detect the pressure from the fluid of compressor 116, compressor 118, compressor 126, compressor 128.Temperature sensor 160, temperature sensor 162 detect the temperature of the fluid in the downstream of (i) coming flash-pot 110, evaporimeter 120, and the (ii) temperature of the fluid between evaporimeter 110, evaporimeter 120 and compressor 116, compressor 118, compressor 126, compressor 128.
Evaporimeter 110, evaporimeter 120 can be microchannel (MC) cooling coil assemblies and/or comprise MC heat exchanger and/or can be fin tubular type cooling coil assembly.Expansion valve 112, expansion valve 122 are the expansion valves (for example EEV) based on electronics.Each condenser in condenser 114, condenser 124 can have polytype, for example air cooled condenser, water cooled condenser or glycol condenser.Condenser 114, condenser 124 can comprise heat release, and heat release is delivered to such as extraneous air of colder medium by heat from Returning fluid.Heat release can comprise air or liquid cooled heat exchangers.
In each cooling circuit in cooling circuit 104, cooling circuit 108, cooling fluid (or cold-producing medium) by compressor 116, compressor 118, compressor 126, compressor 128 accordingly to circulation.Fluid is from compressor 116, compressor 118, compressor 126, compressor 128 flow through condenser 114, condenser 124, and then expansion valve 112, expansion valve 122 and evaporimeter 110, evaporimeter 120 return to compressor 116, compressor 118, compressor 126, compressor 128.Evaporimeter 110, evaporimeter 120 can be disposed at different levels in, make air with the serial mode upstream evaporimeter 110 of first flowing through, the evaporator downstream device 120 of then flowing through.By multiple cooling class of arranging for serial Air Flow, reduce the temperature difference across evaporimeter 110, evaporimeter 120.This then allows evaporimeter 110, evaporimeter 120 with different stress level operations, and allows to reduce the pressure differential between corresponding evaporimeter 110, evaporimeter 120 and condenser 114, condenser 124.
Because compressor horsepower is the function of the pressure differential between evaporimeter and condenser, therefore lower pressure differential is high energy efficiency more.Each cooling circuit in cooling circuit 104, cooling circuit 108 can comprise that tandem compressor for example, to (compressor 116, compressor 118 or compressor 126, compressor 128).Each compressor in tandem compressor can be fixed capacity scroll compressor (for example compressor 116, compressor 126) or variable capacity scroll compressor (for example compressor 118, compressor 128).Fixed capacity scroll compressor can the control signal based on being generated by cooling control module 109 be activated (power-up state ON) and forbid (power-up state OFF).Variable capacity scroll compressor can be controlled by the corresponding data signal receiving from cooling control module 109.
Each cooling circuit in cooling circuit 104, cooling circuit 108 can comprise tandem compressor bank.Each compressor in tandem group can comprise two compressors of equal volume displacement.The first compressor can be to receive PWM percentage signal to control the speed of the first compressor and the digital pulse width modulation of capacity (PWM) scroll compressor.The second compressor can be the constant speed scroll compressor with simple On/Off volume controlled.The suction line of these two compressors and discharge pipe line can be that parallel pipeline is to form tandem group.As example, compressor 116, compressor 126 can be PWM scroll compressors, and compressor 118, compressor 128 can be constant speed scroll compressors.Constant speed scroll compressor can receive On/Off control signal, but not from the pwm signal of cooling control module 109.
The configuration of tandem compressor bank is by providing the capacity modulation of wide region to allow the temperature control of high energy efficiency for the cooling circuit of air-conditioning system.Tandem group provides the configuration of the high energy efficiency of compressor in the time starting by allowing digital PWM scroll compressor to be activated before constant speed scroll compressor.This allows tandem group to provide to have reduced the partial dislocation operation of volumetric displacement/capacity effectively, until need to be from the extra capacity of fixed scroll formula compressor.
Compressor pressure is as used herein poor refers to poor between the input pressure of compressor and output pressure.Low pressure difference (suction pressure and the discharge pressure that are less than predetermined difference and/or compressor are equal to each other) can cause unloaded compressor state.Compressor zero load can cause the cooling capacity of tandem compressor bank in the time starting to reduce and the potential damage of tandem group and/or the compressor electric motor that is associated.The unloaded ability that can reduce tandem group moving steam of compressor, therefore reduces cooling capacity.If reducing appears in pressure differential repeatedly, the minimizing of this pressure differential also can cause the damage of compressor electric motor.
Also with reference to figure 3, show the functional block diagram of overheated regulator control system 200.Overheated regulator control system 200 comprises cooling control module 109 and cooling circuit 202(for example one of cooling circuit 104, cooling circuit 108).Cooling control module 109 comprised thermal modules 204, first adder 206, pid control module 208, compressor load module 210, position determination module 212 and expansion valve (EV) control module 214.
Cross sensor 216(for example sensor 154, sensor 156, sensor 160, the sensor 162 of thermal modules 204 from cooling circuit 202) sensor-lodging and/or receive saturation temperature SatTemp from saturation block 218.Sensor signal can comprise suction pressure signal SucPres and compressor inlet temperature signal ComplNTemp.Saturation block 218 is determined the saturation temperature SatTemp of the compressor (for example one of compressor 116, compressor 118, compressor 126, compressor 128) of cooling circuit 202 based on suction pressure signal SucPres.Cross thermal modules 204 and can comprise the second adder 220 that compressor inlet temperature ComplNTemp can be deducted to saturation temperature SatTemp and generate heat alarm SH.Heat alarm SH can comprise the current superheat value of the superheat state of indicating compressor.
First adder 206 use superheat setpoint SET deduct heat alarm SH and generate rub-out signal ERROR.Can point out superheat setpoint SET by set point module 222.It can be the superheat setpoint SET of predetermined value that set point module 222 generates.
Pid control module 208 provides the PID control of the position of the EV of cooling circuit 202.Pid control module 208 generates control signal PIDCONT(or the first control signal) to control the position of EV based on rub-out signal ERROR.Pid control module 208 can have for example ratio, the integration and differentiation gain of the parameter of adjustment, and this adjustment parameter can be for being identified for the value of the PID that EV controls.
Compressor load module 210 is determined the load (or compressor load) of compressor and is generated the load signal LOAD of the determined load of indication.Compressor load can refer to the level of percent of available total compressor load.Available total compressor load can refer to one or more total loads that compressor is possible.Compressor load can refer to the total amount of the load that can use for tandem compressor bank.Compressor load can be directly proportional to the dutycycle of compressor (or (ON) time of unlatching is than closing (OFF) time).
As example, in one embodiment, use and there is the tandem group of two compressors and comprise digital scroll compressor and fixed scroll formula compressor.Compressor load be less than or equal to the total compressor load that for example can use 50% time, can use digital scroll compressor.Compressor load be greater than available total compressor load 50% time, except digital scroll compressor, can also use fixed scroll formula compressor.If compressor load is 60%, can 50% compressor load be provided and 10% compressor load can be provided by digital scroll compressor by fixed scroll formula compressor.The load of numeral scroll compressor can oblique deascension in the time opening fixed scroll formula compressor, and can oblique ascension in the time closing fixed scroll formula compressor.
Can generate load signal LOAD to regulate temperature and/or humidity level in room or predetermined region based on cooling request and/or dehumidifying request.Cooling control module 109 can generate cooling request and/or dehumidifying request in response to the input of the temperature and humidity level for cooling control module 109 (being jointly called input signal INPUT).The input of temperature and humidity level can provide via for example user interface 224, and user interface 224 can be connected to cooling control module 109 or be included in cooling control module 109 as a part.User interface 224 can comprise keypad, display, touch-screen or other suitable interfaces.
Position determination module 212 is determined EV226(for example one of EV112, EV122) position or opening percentage and generate the second control signal OPEN%.Position determination module 212 generates the second control signal OPEN% based on load signal LOAD.Can generate the second control signal OPEN%, OPEN% in formula 1 according to for example formula 1 prevprevious definite opening percentage or the first value of the second control signal OPEN%, OPEN% curthe second value as open front percentage or the second control signal OPEN%, CompLOAD curthe currency of current compressor load or load signal LOAD, CompLOAD prevbe the preceding value of previous compressor load or load signal LOAD, a is the first input constant, and b is the second input constant (or exponential constant).Variable a and b can be predetermined values.
OPEN % Cur = aOPEN % Prev [ CompLoad Cur CompLoad Prev ] b - - - ( 1 )
Compressor load module 210 and position determination module 212 can be for the amounts of the variation of anticipation compressor load and/or superheat value and prediction variation.Can the large step based on cooling and dehumidifying request prediction compressor load change (for example due to the unlatching of compressor or close or be greater than the variation of predetermined threshold value).For the reaction time of the fluid in the cooling circuit 202 of considering to change owing to the variation of the load of asking, the variation of the prediction of position determination module 212 based on compressor load generates the second control signal OPEN% to meet cooling and dehumidifying request.
Can be CompLOAD in current compressor load prevand the compressor load of estimating or predict can be CompLOAD cursituation under, can generate the second control signal OPEN%.Can before becoming the compressor load of estimating or predict, compressor load generate the second control signal OPEN%.Change while occurring and/or at the During of predetermined compressor load, EV control module 214 can generate EV control signal EV based on the second control signal OPEN% in compressor load.
EV control module 214 generates EV control signal to regulate the position of EV based on control signal PIDCONT and OPEN%.EV control module 214 comprises comparison module 230 and evaluation module 232.Comparison module 230 can receive load signal, current compressor load LOAD cand/or previous compressor load LOAD p.Can determine compressor load LOAD based on load signal LOAD c, compressor load LOAD p.Comparison module 230 also can receive predetermined threshold value PREDTHR and predetermined time TIME from memory 235 pRED.The threshold value that memory 235 is storing predetermined and time 236.Comparison module 230 is determined for predetermined time TIME pRED, load LOAD c, LOAD pbetween difference whether be greater than predetermined threshold value PREDTHR.Comparison module 230 can comprise the currency of timer 2 38 and predetermined time TIME pREDthe timer module 234 comparing.Comparison module 230 generates comparison signal LC based on the comparison.
Evaluation module 232 reception control signal PIDCONT, OPEN% and generate EV control signal EV based on control signal PIDCONT, OPEN%.In one embodiment, evaluation module 232 is determined based on the first control signal PIDCONT or the second control signal OPEN% generation EV control signal.This definite signal LC based on the comparison.
Can use a large amount of methods to operate overheated regulator control system 200, provide exemplary method by the method for Fig. 4.In Fig. 4, show the logical flow chart of overheated regulate and control method.The method can start at 300 and 306 places, and can be carried out by cooling control module 109.Although mainly described task below with respect to the embodiment of Fig. 2 to Fig. 3, these tasks can easily revise to be applied to other embodiments of the present disclosure.These tasks can be carried out iteratively, and can relate to two algorithms and/or the control method that can carry out concurrently.The first method that is called as PID control method starts at 300 places and comprises that task 300 is to task 304.The second method that is called as the method based on compressor load 306 beginnings and comprise task 302 and task 306 to task 316.
At 302 places, evaluation module 232 determines whether to receive and/or generate owing to the variation of the variation of current compressor load or the expection of compressor load the request that changes EV position.This request can refer to comparison signal LC, and whether the variation of this comparison signal LC indication compressor load is greater than predetermined threshold value PREOTHR.Constant in compressor load, will keep variation constant and/or compressor load while being less than or equal to predetermined threshold value PREDTHR, evaluation module 232 executes the task 304.The variation of compressor load can be the current detection variation of arriving or the variation of prediction.In the time that the variation that receives request, generation request and/or compressor load is greater than predetermined threshold value PREDTHR, execute the task 316.
At 304 places, evaluation module 232 can be based on the first control signal PIDCONT but not is controlled EV226 based on the second control signal OPEN%.Regulate the position (or opening percentage) of EV226 in response to the first control signal PIDCONT.After task 302, execute the task 302.
At 308 places, comparison module 230 reads or definite the first compressor load Load 1and reset and start timer 2 38.Comparison module 230 can receive or definite the first compressor load Load based on load signal LOAD 1and by the first compressor load Load 1be stored in memory 235.Timer module 234 is reset and/or is started timer 2 38.
At 310 places, timer module 234 determines whether the value of timer 2 38 equals predetermined time TIME pRED.Task 310 provides delay between task 308 and task 310.In the time of the variation that predicts compressor load, can not execute the task 310.If the value of timer 2 38 equals predetermined time TIME pRED, execute the task 312.
At 312 places, comparison module 230 reads, determines and/or prediction the second compressor load Load 2with the position of EV226 and stop timer 2 38.Can ask to determine and/or predict the second compressor load Load based on cooling and dehumidifying 2.The position of EV226 or first open front percentage OPEN% pREVcan determine and/or be stored in memory 235 based on previous EV control signal.Comparison module 230 can receive or definite the second compressor load Load based on load signal LOAD 2and by the second compressor load Load 2be stored in memory 235.
At 314 places, comparison module 230 can obtain compressor load LOAD by reference to storage 235 1, compressor load LOAD 2, by compressor load LOAD 1, compressor load LOAD 2compare and/or whether the variation of definite compressor load is greater than predetermined threshold value PREDTHR.If the variation of compressor load is greater than predetermined threshold value PREDTHR, executes the task 302, otherwise execute the task 308.If execute the task 302, comparison module 230 can ask to use method rather than PID control method based on compressor load to carry out EV Position Control.If execute the task 308, the PID that continues the position to EV226 at 304 places controls.
Can execute the task and 308 predict the variation of the compressor load that is greater than predetermined threshold value PREDTHR to task 314.Can execute the task and 308 carry out the large variation of anticipation compressor load to task 314, for example, in the time opening or close the fixing compressor group of tandem.Can be in compressor load from the first compressor load LOAD 1change to the second compressor load LOAD 2before actual generation, execute the task 308 to task 314.As mentioned above, can determine the second compressor load LOAD based on cooling and dehumidifying request 2.There is compressor load from the first compressor load LOAD 1actual change is to the second compressor load LOAD 2time and/or change in compressor load predetermined during in, can execute the task 316.
At 316 places, evaluation module 232 generates EV control signal, the position (or opening percentage) of this second control signal OPEN% based on previous compressor load and current compressor load and EV226 based on the second control signal OPEN%.Use respectively the first load LOAD 1with the second load LOAD 2as previous compressor load CompLOAD pREVwith current compressor load CompLOAD cur, can calculate the second control signal OPEN% according to the formula 1 for example providing above.The first open front percentage OPEN%PREV of formula 1 can the EV control signal based on previous determine.
In one embodiment, use PID control method control method by default.As determined at 314 places, in the time that the variation of compressor load is greater than predetermined threshold value PREOTHR, can regulate the position of an EV226.After the variation based on compressor load, control can turn back to the position of controlling to regulate EV226 based on PID.As an example, in the time that the variation of compressor load is greater than predetermined threshold value PREOTHR, comparison signal LC can equal 1 or TRUE(true), and in the time that the variation of compressor load is less than or equal to predetermined threshold value PREOTHR, comparison signal LC can be 0 or FALSE(vacation).Equal the method that can use based on compressor load at comparison signal LC at 1 o'clock, and equal can use PID control method at 0 o'clock at comparison signal.
It is illustrative example that above-mentioned task is intended to; Can be according to being applied in during the overlapping time cycle sequentially, synchronously, simultaneously, carry out these tasks continuously or with different orders.In addition, can not carry out or skip any task in these tasks according to embodiment and/or sequence of events.
In fact, description is above only illustrative, and is never intended to limit present disclosure, its application or purposes.Can realize with various forms the teaching widely of present disclosure.Therefore, although present disclosure comprises specific example, the true scope of present disclosure should not be restricted to this, because in the time of study accompanying drawing, description and described claim, other modifications will become obvious.For clarity, will use identical Reference numeral to identify identical element in the accompanying drawings.As used herein, at least one in word A, B and C is to be understood as and uses exclusive logic OR presentation logic (A or B or C).Should be understood that, in the case of not changing the principle of present disclosure, can be with one or more step in different order (or simultaneously) manner of execution.
As used herein, term " module " can refer to the part in following or comprise following: special IC (ASIC); Electronic circuit; Combinational logic circuit; Field programmable gate array (FPGA); The processor (shared, special or group) of run time version; Described functional other suitable hardware componenies are provided; Or the combination of above-mentioned some or all is as in SOC(system on a chip).Term " module " can comprise the memory (shared, special or group) of storing the code of being carried out by processor.
As used above, term " code " can comprise software, firmware and/or microcode, and can refer to program, method, function, class and/or object.As used above, term " is shared " some or all codes that represent from multiple modules and can be carried out with single (sharing) processor.In addition, can be by single (sharing) memory stores from some or all codes of multiple modules.As used above, term " group " represents can carry out with one group of processor from some or all codes of individual module.In addition, can store with storage stack from some or all codes of individual module.
Equipment described herein and method can be realized by one or more computer programs, and one or more computer programs are carried out by one or more processors.Computer program comprises the executable instruction of processor being stored on the tangible computer-readable medium of non-transient state.Computer program also can comprise the data of storage.Nonrestrictive nonvolatile memory, magnetic memory and the optical memory of being exemplified as of the tangible computer-readable medium of non-transient state.
Although term " first ", " second ", " the 3rd " etc. can be in this article for describing various elements, parts and/or module, these projects should not limited by these terms.These terms can be only for distinguishing a project and another project.While using in this article term as " first ", " second " and other terms with numeral, unless explicitly point out by context, otherwise do not imply sequence or order.Therefore,, in the case of not departing from the teaching of example embodiment, the first project discussed herein can be called as the second project.
For the purpose of illustration and description, provide describing of embodiment above.This is not intended to exhaustive or restriction the present invention.Unique element or the feature of specific implementations are not limited to this specific implementations conventionally, but applicable in the situation that even without pointing out particularly or describing, be also interchangeable and can be in selected embodiment.Same element or feature also can change in many ways.This variation should not be regarded as a departure from the present invention, and all such modifications are all intended to be included in the scope of present disclosure.

Claims (20)

1. a system, comprising:
Load module, it is configured to determine the preload of working as of compressor;
Comparison module, it is configured to the described first preload when preload and described compressor to compare with based on the described comparison signal that relatively generates; And
Control module, it is configured to the (i) superheat value based on described compressor and generates the first control signal, and (ii) generates the second control signal based on described when preload and described first preload,
Wherein, described control module is configured to, and based on described comparison signal, controls the position of expansion valve according to described the first control signal or described the second control signal.
2. system according to claim 1, wherein, described control module is configured to be greater than predetermined threshold value in response to described comparison signal, controls the position of described expansion valve according to described the second control signal.
3. system according to claim 2, wherein, described control module is configured to be less than or equal to described predetermined threshold value in response to described comparison signal, controls the position of described expansion valve according to described the first control signal.
4. system according to claim 2, also comprises timer module, and described timer module is configured to the value of timer and predetermined time to compare,
Wherein, described control module is configured to (i) determine described first preload, then starts timer, and (ii) determines the described preload of working as in the time that the value of described timer equals described predetermined time.
5. system according to claim 1, wherein, described control module is configured to acquiescence and controls the position of described expansion valve according to described the first control signal, and in the time that the variation of described load is greater than predetermined threshold value, controls the position of described expansion valve according to described the second control signal.
6. system according to claim 1, wherein, described the first control signal is at least one in PID control signal.
7. system according to claim 1, wherein, described control module is configured to generate described the first control signal based on superheat setpoint,
Wherein, described control module is configured to based on determine described superheat value to get off: (i) the inlet temperature of described compressor, and the (ii) suction pressure of described compressor.
8. system according to claim 1, wherein, described control module is configured to generate described the second control signal based on the described ratio when preload and described first preload.
9. system according to claim 1, wherein, described control module is configured to generate described the second control signal based on the previous version of described the second control signal.
10. system according to claim 9, wherein, described control module is configured to generate described the second control signal based on the first input constant, the described ratio when preload and described first preload and the second input constant.
11. 1 kinds of systems, comprising:
Load module, it is configured to the variation of the load that detects compressor; And
Control module, it is configured to (i) superheat value proportional integral in the next life differential pid control signal based on described compressor, and (ii) the variation based on described load generates expansion valve control signal,
Wherein, described control module is configured to, and in response to the variation of described load, becomes from the position transition of controlling expansion valve according to described pid control signal the position of controlling described expansion valve according to described expansion valve control signal.
12. systems according to claim 11, wherein, described control module is configured to acquiescence and controls the described position of described expansion valve according to described pid control signal, and in the time that the variation of described load is greater than predetermined threshold value, controls the position of described expansion valve according to described expansion valve control signal.
13. systems according to claim 11, wherein, the ratio that described control module is configured to the first preload based on described load and described compressor generates described expansion valve control signal.
14. systems according to claim 11, wherein, described control module is configured to generate described expansion valve control signal based on the previous version of described expansion valve control signal.
15. systems according to claim 14, wherein, described control module is configured to multiply each other to generate described expansion valve control signal based on following three: (i) the first input constant, (ii) the described previous version of described expansion valve control signal, and the (iii) power of the index input constant of the ratio of described load and first preload.
16. 1 kinds of methods, comprising:
Determine the preload of working as of compressor;
The described first preload when preload and described compressor is compared;
Based on the described comparison signal that relatively generates; And
Based on described comparison signal,
Superheat value based on described compressor generates the first control signal and according to the position of described the first control signal control expansion valve, or
Based on described when preload with described first preload generates the second control signal and according to the position of expansion valve described in described the second control signal control.
17. methods according to claim 16, also comprise:
Be greater than predetermined threshold value and control according to described the second control signal the position of described expansion valve in response to described comparison signal; And
Be less than or equal to described predetermined threshold value and control according to described the first control signal the position of described expansion valve in response to described comparison signal.
18. methods according to claim 16, also comprise:
In the time that the variation of described load is less than or equal to predetermined threshold value according to described the first control signal rather than control the position of described expansion valve according to described the second control signal; And
In the time that the variation of described load is greater than described predetermined threshold value, according to described the second control signal rather than control the position of described expansion valve according to described the first control signal.
19. methods according to claim 16, also comprise based on described the second control signal of following generation:
The described ratio when preload and described first preload of described compressor; And
The previous version of described the second control signal.
20. methods according to claim 16, also comprise:
Generate described the first control signal based on superheat setpoint;
Inlet temperature based on (i) described compressor and the (ii) suction pressure of described compressor are determined described superheat value; And
Previous position based on described expansion valve and described ratio of working as preload and described first preload generate described the second control signal.
CN201310590547.7A 2012-11-21 2013-11-20 Expansion Valve Position Control Systems And Methods Pending CN103836861A (en)

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