CN100465549C - Evaporator pressure regulator control and diagnostics - Google Patents
Evaporator pressure regulator control and diagnostics Download PDFInfo
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- CN100465549C CN100465549C CNB2005800117419A CN200580011741A CN100465549C CN 100465549 C CN100465549 C CN 100465549C CN B2005800117419 A CNB2005800117419 A CN B2005800117419A CN 200580011741 A CN200580011741 A CN 200580011741A CN 100465549 C CN100465549 C CN 100465549C
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Abstract
An apparatus for refrigeration system control includes a plurality of circuits, each circuit having at least one refrigeration case and an electronic evaporator pressure regulator in communication with each circuit. Each electronic evaporator pressure regulator controls a temperature of one of the circuits. A sensor in communication with each circuit measures a parameter from the circuit. A controller associated with each electronic evaporator pressure regulator controls the respective electronic evaporator pressure regulator based upon measured parameters from each of the circuits.
Description
Technical field
This instruction relates generally to the method and apparatus of a kind of refrigeration system control and diagnosis, and relates in particular to the refrigeration system control of using evaporator pressure regulator and the method and apparatus of diagnosing.
Background technology
Traditional refrigeration system can comprise the frame of a plurality of compressors that link to each other with some refrigeration circuits.Refrigeration circuit is generally defined as the physically vertical case series of operating under identical usually pressure and/or temperature.For example, in the grocery store, may have the independent refrigeration circuit that is used for frozen food, meat and dairy produce, each circuit has one or more case (case) in similar temperature range operation, and described circuit is in the different temperatures range operation.Usually the valve of evaporimeter pressure regulation (EPR, the evaporator pressure regulator) valve by using machinery or other and each circuit located in series is realized the temperature difference between the described circuit.The pressure of all casees in each EPR valve regulation particular electrical circuit.The pressure of EPR valve controling circuit is set up between system's installation period usually, perhaps uses to place the mechanical guide screw (pilot screw) of valve to be recalibrated during safeguarding.The selection of circuit pressure is based on the pressure drop between the circuit top box, frame suction pressure and oven temperature, degree demand.
Use public suction header and public discharge collector described a plurality of compressors in parallel to form compressor rack.By driving each compressor of adjusting between state and the off status in a controlled manner, determine the suction pressure of compressor rack.The suction pressure set-point of compressor rack is set to satisfy the value of minimum evaporimeter circuit requirements usually.In other words, the circuit of operating under minimum temperature is controlled the suction pressure set-point usually, and this suction pressure set-point is fixed to satisfy the refrigerating capacity demand of described minimum temperature.
Because the continuous ambient temperature condition that changes, oven temperature, degree demand changes in the whole year usually.For example, in the winter time, the case useful load is lower usually, may need the high suction pressure set-point.On the contrary, in summer, the case useful load is higher usually, may need lower suction pressure set-point.By adjust the EPR valve seasonally, make the output adaptation of refrigeration system satisfy seasonal case useful load demand, can increase from efficient and realize cost savings.By changing the EPR valve, the suction pressure set-point of compressor rack is adjusted to influence refrigeration system output.Because the adjustment of EPR valve needs the Refrigeration Technique personnel usually, because this adjustment is carried out in cost and the restriction of time seldom at the scene.
Need not stand above-mentioned shortcoming such as those disclosed electronics EPR valve in assignee's United States Patent (USP) the 6th, 360,553,6,449,968,6,601,398 and 6,578,374 (its each incorporate into by reference) at this.Described EPR valve obtains more accurate and stable oven temperature, degree for each circuit provides the adaptation adjustment of evaporator pressure, but each EPR valve needs independent driver.
Summary of the invention
Improved evaporator pressure regulator system provides and the relevant compact control circuit of each electronic stepper regulator (ESR) valve module.Described system comprises the ESR valve module in the chain routed to system controller, simultaneously with the chrysanthemum link therefrom of other ESR valve module, with simplified wiring and reduce on-the-spot installation cost.Described ESR control circuit comprises diagnosis and communication feature, system's control of auxiliary cooling system and on-the-spot service.Described ESR valve module can comprise sensor and/or sight glass, so that the affirmation of mode of operation to be provided, further to have improved diagnosis and has reduced on-the-spot cost of serving.
From detailed description provided below, more many-sided ability of this instruction will become obvious.Should be appreciated that detailed description and clear and definite example when indicating the preferred embodiment of described instruction, only are intended for use illustrative purposes, and do not plan to limit the field of this instruction.
Description of drawings
From detailed description and drawings, this instruction will become and be easy to more by complete understanding, wherein:
Fig. 1 is the instruction according to this instruction, the block diagram of the refrigeration system of the method and apparatus of use coded system control;
Fig. 2 is the cut-away section side view according to the ESR valve of the instruction of this instruction;
Fig. 3 is the motor of ESR valve of Fig. 2 and the cross sectional side view and the schematic diagram of controller.
Fig. 4 is the cut-away section side view according to another ESR valve of the instruction of this instruction;
Fig. 5 is the motor of ESR valve of Fig. 4 and the cross sectional side view and the schematic diagram of controller; And
Fig. 6 is the cross sectional side view of the ESR valve of Fig. 2.
The specific embodiment
Followingly relate to being described in essence of the method and apparatus that uses the electronic anesthetic vaporizer pressure regulator to carry out refrigeration system control, and plan the described instruction of restriction or its application or use only as illustration.In addition, when going through this instruction with respect to the specific hardware type below, this instruction may be used the hardware of other type, and it can be operated and be configured to provide usually and identical control discussed herein.For example, to the description of this instruction in conjunction with refrigeration system, but be equally applicable to other system, comprising air-conditioning, cooler, hot pump in low temp and transportation.
Consult Fig. 1, show more detailed block diagram according to the refrigeration system 10 of this instruction.Described refrigeration system 10 comprise all be positioned at compressor rack 18, by shared suction header 14 with discharge a plurality of compressors 12 that collector 16 is carried together.Compressor rack 18 makes cold-producing medium by described refrigeration system 10 circulations, and by doing like this, the high-pressure refrigerant that evaporates is transported to condenser 20.Described condenser 20 is from the cold-producing medium of described compressor rack 18 reception evaporations and with the high-pressure refrigerant liquefaction of evaporating.
High pressure liquid refrigerant is transported to a plurality of refrigeration circuits 26 from condenser 20 through piping 24.Each refrigeration circuit 26 comprises at least one refrigeration case 22, and it is operated in similar temperature range to other refrigeration case 22 in the same circuit 26.Fig. 1 shows four (4) the individual circuit 26 that are labeled as circuit A, circuit B, circuit C and circuit D.Circuit 26 shown in each comprises four (4) individual refrigeration cases 22.However, person of skill in the art will appreciate that refrigeration system can comprise any amount of circuit 26, and can comprise any amount of refrigeration case 22 in the circuit 26.Each circuit 26 will be operated in the temperature range of determining usually.For example, circuit A can be used for frozen food, and circuit B can be used for dairy produce, and circuit C can be used for meat, or the like.
Each circuit 26 comprises pressure regulator, and preferably (ESR) valve module 28 is regulated in the electronics stepping, and it controls evaporator pressure, and therefore controls the temperature of the cooling space in the refrigeration case 22.Each ESR valve module 28 generally includes valve 110, and can comprise control and diagnosis unit (CDU, control and diagnostic unit) 132.Each ESR valve 28 can comprise independent CDU 132, perhaps replacedly, can arrange independent CDU 132 to control a plurality of ESR valve modules 28.Described valve module 28 interconnects in daisy chain circuit 35 by communication line 200.
For oven temperature, degree control, each refrigeration case 22 comprises evaporimeter and expansion valve, and expansion valve can be machinery or electronic valve, is used to control high pressure liquid refrigerant overheated of the evaporimeter that flows through each refrigeration case 22.Pressure drop takes place, high pressure liquid refrigerant is become the low pressure mixture of liquid and steam through expansion valve in described cold-producing medium herein.When the warm relatively air from refrigeration case 22 moved past evaporimeter, described low pressure liquid became gas, and described gas is transported to the ESR valve module 28 relevant with this particular electrical circuit 26.
At ESR valve module 28, when gas returned compressor rack 18, pressure descended according to the position of valve 110.Determine the position of described valve 110 it to be analyzed with the delivery valve position signalling by case and/or circuit state by control algolithm.In compressor rack 18, described low-pressure gas is compressed to higher pressure once more and is transported to condenser 20 to repeat kind of refrigeration cycle.
Described control algolithm can be carried out by main refrigeration controler 30 or CDU 132, to control the position of each other valve 110.In addition, main refrigeration controler 30 or CDU 132 can also control the suction pressure set-point of whole compressor frame 18.Einstein's area controller that main refrigeration controler 30 is preferably provided by CPC International Inc. of Atlanta, continent, Georgia, perhaps the Programmable Logic Controller of any other type as in this discussion, can be programmed to it.Main refrigeration controler 30 is by the compressor bank 12 in the input/output board 32 control compressor rack 18.Input/output board 32 has relay switch, so that compressor 12 operated the suction pressure that expectation is provided.
Consulting the circuit A of Fig. 1, is the overheated of the independent case controller 21 such as CC-100 case controller that CPC International Inc. of Atlanta, continent, Georgia the provides cooling agent that can be used to be controlled to each refrigeration case 22 equally.Case controller 21 can be by relevant electric expansion valve 25 cooperations of communication network or bus 34 and each refrigeration case 22.Described network/bus 34 can be any suitable communications platform such as RS-485 communication bus, LonWorks Echelon bus or wireless network, makes winner's refrigeration controler 30 and independent case controller 21 from each case 22 reception information.Consult the circuit B of Fig. 1, can use mechanical swelling valve 23 to replace case controller 21 and electric expansion valve 25.
In order to monitor the pressure in each circuit 26, can provide first pressure sensor 36 at each circuit 26, and be placed on the output of refrigeration case group 22 or adjacent with ESR valve module 28.Each first pressure sensor 36 transmits analog signals to the analog input plate 38 relevant with main refrigeration controler 30 or to the analog input 189 relevant with the CDU 132 of ESR valve module 28.For arbitrary arrangement, analog input plate 38 or analog input 189 measure analog signals, and send data to the CDU 132 of main refrigeration controler 30 or ESR valve module 28 respectively.Replacedly, can use Wi-Fi to transmit force value.Second pressure sensor 40 also is provided, and it is measured the suction pressure of compressor rack 18 and provides analog signal by communication bus 34 or by wireless network to analog input plate 38.
In order to change the position of the valve 110 in each assembly 28, main refrigeration controler 30 can be to the drive circuit sending valve position signalling of the CDU 132 of each ESR valve module 28, and ESR valve module 28 is communicated by letter with main refrigeration controler 30 by the daisy chain circuit 35 that is connected with communication bus 34.Replacedly, first pressure sensor 36 of each circuit 26 can provide analog signal to the CDU 132 of ESR valve module 28, and ESR valve module 28 operation control algolithms are determined subsequently can be by the position of the valve 110 of the drive circuit of CDU 132 driving.The position of valve 110 can send main refrigeration controler 30 to by daisy chain circuit 35, communication bus 34 and/or wireless network.
With to use first pressure sensor 36 to control ESR valve module 28 opposite, can also use environment temperatures in the case 22 to control the position of each valve 110.In this, the circuit C that illustrates has the temperature sensor 44 relevant with each independent refrigeration case 22.Each refrigeration case 22 among the circuit C can have independent temperature sensor 44, be used for measuring average/minimum/maximum temperature, be used for controlling ESR valve module 28, perhaps, when the ownership ice chest in the circuit 26 is operated, can use single temperature sensor 44 in the refrigeration case 22 in circuit C in essentially identical temperature range.These temperature inputs can be provided for analog input plate 38, and it turns back to main refrigeration controler 30 by communication bus 34 with information.
Main refrigeration controler 30 passes through its relevant CDU 132 subsequently to control valve 110 sending valve position signallings.Replacedly, can directly provide the temperature input to CDU 132, CDU 132 operation control algolithms are determined the valve position by the drive circuit driving.Once more, the position of valve 110 can send main refrigeration controler to by daisy chain circuit 35, communication bus 34 and/or wireless network.
Determine that with using independent temperature sensor 44 temperature of refrigeration case 22 is relative, can replacedly use the temperature display module 46 shown in circuit D.Temperature display module 46 preferably TD3 oven temperature, degree shows that the CPC International Inc. by Atlanta, the Georgia State provides equally, and at United States Patent (USP) the 6th, 502, have more comprehensively in 409 and 6,378,315 and describe, its each incorporate into especially by reference at this.In this, display module 46 will be installed in each refrigeration case 22.Each module 46 is designed to measure a plurality of temperature signals, comprises case delivery temperature, analog equipment temperature and defrosting final temperature.These sensors can also exchange with other sensor, such as returning air borne sensor, evaporator temperature sensor or clean (clean-switch) sensor that switches.
The product temperature of described simulation can be provided by the product probe, and the CPC International Inc. by Atlanta, the Georgia State provides equally, and describes to some extent in the patent of quoting in the above.According to above-described pressure and temperature sensor, temperature display module 46 can provide signal to main refrigeration controler 30, and main refrigeration controler 30 sends position signalling to CDU 132 conversely.Replacedly, temperature display module 46 can independently be determined control signal and direct control valve 110, perhaps can provide signal to CDU 132, and CDU 132 operation control algolithms are determined the position of valve 110.CDU132 can send the valve position of determining to main refrigeration controler 30 by daisy chain circuit 35, communication bus 34 and/or wireless network subsequently.
Fig. 2 and 4 shows valve 110, and it generally includes the main body 124 that electric motor assembly 120 and definition are fit to hold the axle opening 123 of piston 122.Piston 122 can move by bidirectional linear in main body 124.Main body 124 can comprise clock 125 and tube portion 126 and sight glass 127 and hall effect sensor 137.The electric motor assembly 120 of valve 110 provides power by CDU 132 and controls.
Consult Fig. 3 and 5 now, show the CDU 132 of electric motor assembly 120 and ESR valve module 28 in further detail.Described electric motor assembly 120 generally includes the motor 134 that is installed on the welding partition 136 that is fixed in motor casing 138.Shell 138 is closed by cover assembly 140, and cover assembly comprises conductive base pin 142, by this conductive base pin, will offer the motor 134 shown in Fig. 2 and 4 through the power that CDU 132 receives.Cover assembly 140 can be integrated with CDU132, perhaps as shown as independent parts.Motor 134 drives the pinion shaft 144 with screw thread, although do not illustrate.Pinion shaft 144 extends through the opening 148 of nut 150, and nut 150 is threaded onto the bottom of shell 138.Motor 134 and pinion shaft 144 comprise actuator 152, are used for providing linear force to piston 122.
As shown in the figure, motor 134 is the bipolar stepping motors of Linear Driving, but replacedly can be the one pole stepping motor.Motor 134 is controlled the required flow of coolant of temperature with discrete increment mobile piston 122 to adjust.Stepping motor provides discrete control, and, when mobile piston 122, only need minimum electrical power, and when piston 122 is remained on static position, do not need electrical power.Motor can be the bipolar stepping motor of two-phase, operates under the speed of 50 pulses of per second, 12 or 24 volts of direct current nominal bipolar driving voltages.As shown in the figure, motor 134 is directly to drive stepping motor.Direct and pinion shaft 144 couplings of electric motor assembly (not shown), direct and piston 122 couplings of pinion shaft.Therefore, there are not gear or other mechanical device to be used for increasing motor torque.
Described CDU 132 generally includes shell 180, and it can be directly mounted to shown in Fig. 2 and 3 on the ESR valve module 28, perhaps separates with ESR valve module 28 shown in Figure 4 and 5.CDU 132 directly is installed to the demand of having eliminated on the ESR valve module 28 for extend to the wire harness of each ESR valve module 28 from CDU 132.The order wire 200 that connects with the daisy chain relation can be used to be connected ESR valve module 28 with power line, has eliminated and has walked the needs of independent order wire 200 to main refrigeration controler 30.In addition, because wiring is carried out between erecting stage by manufacturer,, CDU 132 guaranteed that CDU 132 is connected to ESR valve module 28 by suitable lead so directly being installed to ESR valve module 28.
If shell 180 separates with ESR valve module 28, then CDU 132 can communicate by letter with ESR valve module 28 by any suitable communication means.For example, CDU 132 can directly be connected with ESR valve module 28 leads, and like this, the communication between CDU 132 and the ESR valve module 28 can be finished by wired connection.Replacedly, CDU 132 can with 28 wireless connections of ESR valve module, be positioned at the far-end of ESR valve module 28 to allow CDU 132.Line 201 schematically shows the wired or wireless communication (Figure 4 and 5) between CDU132 and the ESR valve module 28.In either case, network cable 200 can be connected ESR valve module 28 with daisy chaining with power line.
CDU controller 132 comprises processor 183, drive circuit 185, memory 187, COM1 188, analog input 189, operation LED 190, communication LED 191 and position LED 192.CDU controller 132 also comprises data/address bus 194, and processor 183, drive circuit 185, COM1 188, analog input 189 and LED 190,192 are provided, and the communication between one or more other ESR valve 28 and the main refrigeration controler 30.CDU 132 also comprises with conductive base pin 142 and being connected with the power circuit 196 to motor 134 power supplies.Power circuit 196 is by 132 monitorings of CDU controller.Shell 180 comprises the port that is used for conductive base pin 142, be used for the opening of access door 198 and one or more port of the order wire 200 that is used for ESR valve module 28 is connected with daisy chain circuit 35.Should be appreciated that above-mentioned relation is exemplary, and some parts of CDU 132 can be arranged differently.
In a kind of arrangement, analog input 189 can separate arrangement with CDU 132.For example, if CDU 132 is positioned on the valve module 28, then analog input 189 can be communicated by letter with CDU 132, but not necessarily places in the shell 180.
Turn to Fig. 4 now, show piston 122 in further detail with viewgraph of cross-section.Piston 122 comprises first end 154 that is fit to pinion shaft 144 couplings.As shown in the figure, piston first end 154 has screw thread to hold the pinion shaft 144 with screw thread, so that directly piston 122 is coupled in actuator output.Piston 122 also comprises second end 156, and base assembly 158 is coupled with it.Base assembly 158 comprises base disk 160, and it is contained in the circular passage 161 that is limited by base disk carriage 162.Flow tokenizer 163 can further be coupled to base disk 160.
For example, when notion counter when defrosting, may need valve 110 to stop fluid fully and 128 flow to outlet from entering the mouth for cooling.For closing of sealing is provided, base disk 160 must suitably match with the valve seat 164 that main body 124 is limited.Close and prevent internal leakage for what realize sealing, close the related many parts of sealing for formation and need very strict dimensional tolerance and assembling process.This accurate manufacturing demand has increased device cost naturally.Base assembly 158 is configured, and its second end 156 around piston is flexibly connected, and makes and changes with compensation and improve productibility.
As shown in Figure 6, second end 156 of piston defines and has spherical radius (be shown in phantom line and specified by mark 159), is tapered to the circular shaft shoulder 165 of common column part 166.Column part 166 has defined the diameter littler than the internal diameter of base disk carriage 162.The base disk carriage 162 adjacent circular shaft shoulders 165 so form sealing.Can packing ring 167 be set around the shaft shoulder 165, so base disk carriage 162 is in fact against packing ring 167 sealings.Can spring washer 168 and wave washer 169 be set respectively around piston column part 166, wherein spring washer 168 is positioned at against the tokenizer 163 on base disk 160 opposites.Snap ring 170 is contained in the annular groove 171 that is limited by column part 166, with second end, the 156 firm banking assemblies 158 around piston.Firm banking assembly 158 allows base assembly 158 to flexibly connect around the column part 166 of second end 156 of piston by this way.Spherical radius 159 by the circular shaft shoulder 165 promotes this " ball-and-socket " motion, allows 162 maintenances of base disk carriage and piston 122 sealings when base assembly 158 moves around second end 156.
Tokenizer 163 defines the internal diameter bigger than column part 166.This big internal diameter is together with fixing base assembly 158 through spring washer 168, wave washer 169 and snap ring 170, and the 163 horizontal slips of permission tokenizer are also own aims at valve base 164.This has further relaxed required dimensional accuracy and has compensated to make and has changed.
Piston 122 also comprises slipper seal pad 172, and in an embodiment of this instruction, slipper seal pad 172 is spring loaded.Slipper seal pad 172 can be made of artificial rubber well known in the art or thermoplastic.Slipper seal pad 172 is fixed on the shaft shoulder 174 by the snap ring 178 in packing ring 176 and the groove 179.The lip packing that slipper seal pad 172 forms opening 123 when piston 122 moves back and forth in main body 124.
Above the piston 122 and following pressure be balanced to reduce the required power output of motor 120 mobile pistons 122.The inwall and the shaft shoulder 174 of the axle opening 123 of the bottom surface of motor casing 138, main body 124 have defined chamber 181.Piston 122 has defined vertical hole 121 and the transverse holes 184 that is connected with vertical hole 121.Hole 121,184 provide from enter the mouth 128 to the chamber 181 fluid passage, with the pressure on first and second ends 154,156 of equalizing lever 122.
Suitably to flow to effuser 130 and flow to surrounding environment from valve 110 from inlet tube 128 with the fluid that prevents from not expect be very important to seal valve 110.Except that the slipper seal pad 172 of piston 122, the connection of some other sealings cooperates to finish this task.More precisely, in certain embodiments shown in, the motor casing 138 and the cap assembly 140 of electric motor assembly 120 as shown in Figure 3 are sealed.In addition, being threaded between motor casing 138 and the clock 125 and between the tube portion 126 of clock 125 and main body 124 (the best is seen Fig. 2) seals with the operation of mode well known in the art by knife-edge sealing 186.This metal has been eliminated to the Seal Design of metal needs outside seal O shape ring, and has eliminated and the relevant fault of O shape ring.By applying silicones RTV, silicone insulation body gel or other similar sealing medium on every side, come the connection between sealed electrical sub-controller 132 and the electric motor assembly 120 at surperficial contacting electronic controller 132 with electric motor assembly 120.
Suitable power adjusting by the control algolithm carried out at main refrigeration controler 30, perhaps pass through CDU 132, the driving that comes control valve 110 based on the operating parameter of monitoring such as electro-hot regulator (temperature sensor 44 or display module 46) or sensor (first pressure sensor 36).CDU controller 132 or main refrigeration controler 30 carried out the control software algorithms, so that to the drive circuit 183 sending valve position signallings of the power that is adjusted to motor 134.Consult Fig. 2 once more, motor 134 movement actuators 152, its with step-by-step system at axle opening 123 internal linear and two-way ground mobile piston 122, with opening and closing ESR valve module 28.Piston 122 linearities, two-way, step motion make it possible to control the fluid that flows through ESR valve module 28.
Each ESR valve module 28 can be by with at least a control the in three kinds of methods.Specifically, can based on one or more temperature reading of temperature sensor 44, perhaps, control each ESR valve module 28 based on the pressure reading of first pressure sensor 36 based on the product temperature of simulation.In addition, can carry out the diagnosis algorithm of each ESR valve module 28 with indication mode of operation or prognoses system fault by CDU 132.The various algorithms that are used for control valve 110 can be the assignee's of submission on March 31st, 2000 U.S. Patent applications the 09/539th, 563, present United States Patent (USP) the 6th, 360, and the type described in 553, it is disclosed in here incorporates into by reference.
Whether CDU 132 can comprise the valve position algorithm of determining valve position or valve moving direction, be unlocked or close and/or whether valve just is being driven to open or drive and closes such as valve 110.Hall effect sensor 137 combines with CDU 132 and/or main refrigeration controler 30, can whether in fact be in its controlled position by check valve 110.Replacedly, can monitor motor current to determine valve position or diagnosis valve state.
When valve 110 is positioned at complete opening or during the position closed fully, the drive current of the stepping motor 134 of monitoring valve 110 can also be used to determine valve position.CDU 132 can monitor power circuit 196, with the variation (about 30 percentage points) that detects about five to ten milliseconds of electric currents.The about every millisecond of analog to digital sampling of once sampling of speed will detect in complete opening or the decline of closed position electric current fully, and perhaps whether valve module 28 is owing to fragment and by viscous.
Because drive circuit 185 does not receive the valve position feedback data,, be difficult to determine when complete opening or close fully of valve 110 at normal valve control period.Therefore, must determine the accurate position of valve 110 by monitoring other parameter.
A kind of method of valve control is that the valve that excessive driving (over-drive) is closed cuts out or complete opening fully to guarantee it, write down then from that known complete opening or fully the closed position to the stepping of desired position.Can be very useful during this startup that is controlled at ESR valve module 28 and the initialization.For example, start and/or installation period between, can be by at first taking turns rotary valve 110 to complete opening or the position closed fully, driver's valve 110 is to another " self calibration " ESR valve module 28 of complete opening or the position closed fully then.Can be by monitoring current and/or by using hall effect sensor 137 to count valve 110 in complete opening and the stepping of process between the closed position fully.Then, the stepping of record can be used for determining the actual position of valve 110 between the normal operating period by CDU 132.Should be noted that, however, should note excessive driver's valve 110, because this operation can cause valve 110 viscous, if particularly rest on ad-hoc location after a very long time (just, during the defrosting).After excessively driving valve 110 being stepped back several steps can prevent viscous, but can allow to carry during defrosting hot gas.
Use the current sensor monitoring current to allow the valve position that detects complete opening or close fully, and need not to change the valve design, this allows described method to be applied to already used valve.Current waveform that can be by the analysis-driven electric current detects complete opening, closes or the viscous position fully.During normal running, electric current is index and rises, and keeps current value in the pulse duration then.Under the extreme case of valve position (just, complete opening or close fully), electric current begins to be index and rises, but descends about 30 percentage point five to ten milliseconds then.When valve 110 viscous, detect identical index and rise and descend.By placing small resistor (＜1 ohm) at the driving pin of valve, can use operational amplifier to amplify the voltage at resistance two ends, use the A/D converter relevant to read then with CDU 132.When applying pulsed drive, CDU 132 can about every millisecond to signal sampling once.Use saved software in the memory 187, can detect the decline of electric current and take suitable action.Be appreciated that except that current detecting, can also use other to collect the method for valve position or current data.In a single day current data is obtained by CDU132, can be sent to main refrigeration controler 30 and carry out diagnostic analysis.
Current detecting also allows CDU 132 to determine the various malfunctions relevant with ESR valve module 28.For example, if lead-in wire is cut off, disconnects or disconnect from CDU 132 from ESR valve module 28, then CDU 132 can detect the decline of electric current.This information can be sent to main refrigeration controler 30 and be used as diagnostic tool.
Can also determine valve position by using hall effect sensor 137, hall effect sensor 137 detects the position of valve 110 and the position is sent to the analog input 189 of CDU 132.CDU132 can also be sent to valve position main refrigeration controler 30, so that use the controlled location of being determined by CDU 132 or main refrigeration controler 30 to confirm the actual valve position.The supply voltage of hall effect sensor 137 and reference voltage be from CDU 132, and comprise ground terminal.Sensor 137 comprises the silicon chip that meets at right angles and place with magnetic field, is used for determining voltage change based on the position of valve 110.CDU 132 can also supply amplifier and pressure regulator.
The control technology of using valve position data can also be used to remove because fragment and the valve 110 of viscous.If complete opening or buttoned-up status took place before expection, then CDU 132 can attempt before the position of realizing once more expecting valve 110 being stepped back several steps, and thus, any fragment can be removed.If viscous state keeps, valve 110 can be driven to one of extreme position (complete opening or cut out fully), can count stepping then so that diagnostic assessment to be provided.If be less than the step-by-step counting of expection to opposite extreme step-by-step counting, then CDU 132 can predict the fragment state and give a warning.
When detecting the sticking valve state, can carry out control technology automatically by controller 132, perhaps can be undertaken by allowing the technical staff remotely between the opening and closing position, to take turns rotary valve assembly 28 " manually ".For example, when detecting the sticking valve state, CDU 132 can take turns rotary valve 110 automatically to attempt removing fragment between the opening and closing position.Replacedly, CDU 132 can circulate a notice of the sticking valve state to the technical staff, to allow technical staff's long-range land wheel rotary valve 110 between the opening and closing position.
No matter position and/or control strategy, if valve 110 does not have reaction or arrives initial valve position of indicating, CDU 132 can repeat driver's valve 110 to controlled location.Alarm can be sent to main refrigeration controler 30, and perhaps the position LED 192 via ESR valve module 28 places announces.Like this, and compare, can earlier report the valve fault by the state of temperature in the monitoring system ice chest (symptom).The diagnosis more early of this fault can prevent that food from damaging or to the infringement of compressor rack 18.
The description of this instruction is exemplary in essence, and therefore, the variation that does not break away from this instruction main idea is considered in the scope of this instruction.This variation can not be considered the spirit and scope that break away from this instruction.
Claims (44)
1. control device comprises:
The electronic anesthetic vaporizer pressure regulator valve is communicated by letter with the refrigeration circuit with a plurality of refrigeration cases, and described electronic anesthetic vaporizer pressure regulator valve allows the evaporimeter of cold-producing medium from described refrigeration circuit to flow to compressor and can operate the temperature that is used to control described circuit;
The valve sensor can be operated the position data that is used to generate the position of indicating described electronic anesthetic vaporizer pressure regulator valve;
Circuit sensor, the environment temperature of communicating by letter with described refrigeration circuit and can operate at least one the described refrigeration case that is used for measuring described refrigeration circuit; And
Controller receives described position data, and can operate the environment temperature that is used for based on described at least one refrigeration case of measuring, adjusts the position of described electronic anesthetic vaporizer pressure regulator valve, so that described refrigeration circuit is remained in the predetermined temperature range.
2. control device according to claim 1, wherein, described circuit sensor is measured the refrigerant pressure from described circuit.
3. control device according to claim 1 also comprises at least one compressor that flows and be coupled with described electronic anesthetic vaporizer pressure regulator valve.
4. control device according to claim 3, wherein, described controller is controlled the suction pressure of described at least one compressor based on the refrigeration case that has the minimum temperature set-point in the described circuit.
5. control device according to claim 1 also comprises the main refrigeration controler of communicating by letter with described controller.
6. control device according to claim 1, wherein, described controller is installed on the described electronic anesthetic vaporizer pressure regulator valve.
7. control device according to claim 1, wherein, described controller is mounted away from described electronic anesthetic vaporizer pressure regulator valve.
8. control device according to claim 1, wherein, described controller comprises microprocessor and memory.
9. control device according to claim 1, wherein, described valve sensor is a current sensor.
10. control device according to claim 1, wherein, described valve sensor is a hall effect sensor.
11. a control device comprises:
The electronic anesthetic vaporizer pressure regulator valve, communicate by letter with each refrigeration circuit in the refrigeration system, described refrigeration system comprises a plurality of refrigeration circuits, each refrigeration circuit has a plurality of refrigeration cases, and described electronic anesthetic vaporizer pressure regulator valve allows the evaporimeter of cold-producing medium from refrigeration circuit to flow to compressor and can operate the temperature that is used to control one of described a plurality of refrigeration circuits;
Position sensor, relevant with each electronic anesthetic vaporizer pressure regulator valve, and can operate the valve position data that is used to generate each evaporimeter pressure regulator valve;
Circuit sensor is communicated by letter with each refrigeration circuit, and can operate the environment temperature at least one the described refrigeration case that is used for measuring each described refrigeration circuit; And
Controller receives described position data, and can operate the environment temperature that is used for based on described at least one refrigeration case of measuring and control described electronic anesthetic vaporizer pressure regulator valve, so that described refrigeration circuit is remained in the predetermined temperature range.
12. control device according to claim 11, wherein, each described circuit sensor is measured the refrigerant pressure from each described circuit.
13. control device according to claim 11 also comprises at least one compressor that flows and be coupled with described electronic anesthetic vaporizer pressure regulator valve.
14. control device according to claim 13, wherein, described controller is controlled the suction pressure of described at least one compressor based on the lead-circuit with minimum temperature set-point.
15. control device according to claim 11 also comprises the main refrigeration controler of communicating by letter with described controller.
16. control device according to claim 11, wherein, described controller is installed on each electronic anesthetic vaporizer pressure regulator valve.
17. control device according to claim 11, wherein, described controller is mounted away from described electronic anesthetic vaporizer pressure regulator valve.
18. control device according to claim 11, wherein, each comprises microprocessor and memory described controller.
19. control device according to claim 11, wherein, described position sensor is a current sensor.
20. control device according to claim 11, wherein, described position sensor is a hall effect sensor.
21. a method comprises:
Use the electronic anesthetic vaporizer pressure regulator valve to regulate the suction pressure of at least one compressor of refrigeration circuit, so that control the temperature of described refrigeration circuit with a plurality of refrigeration cases;
Change described electronic anesthetic vaporizer pressure regulator valve is determined described electronic anesthetic vaporizer pressure regulator valve to first stop position valve position by wheel;
Determine the mode of operation of at least one described refrigeration case;
Described valve position and described mode of operation are sent to and the relevant controller of described electronic anesthetic vaporizer pressure regulator valve; And
Adjust the position of described electronic anesthetic vaporizer pressure regulator valve based on described detected mode of operation.
22. method according to claim 21, wherein, described definite valve position comprises: change described electronic anesthetic vaporizer pressure regulator valve during second stop position at wheel, measure the valve mode of operation of described electronic anesthetic vaporizer pressure regulator valve.
23. method according to claim 22, wherein, the described wheel changeed described electronic anesthetic vaporizer pressure regulator valve and comprised to described first stop position: wheel changes described electronic anesthetic vaporizer valve to full open position and one of closed position fully, and wheel changes described electronic anesthetic vaporizer pressure regulator valve and comprises to described second stop position: wheel changes described electronic anesthetic vaporizer pressure regulator valve another in described full open position and the complete closed position.
24. method according to claim 23 also comprises described valve mode of operation is sent to main refrigeration controler.
25. method according to claim 23, wherein, described measurement valve mode of operation comprises: the revolution of measuring the motor relevant with described electronic anesthetic vaporizer pressure regulator valve.
26. method according to claim 25, wherein, described measurement revolution comprises: use hall effect sensor.
27. method according to claim 23, wherein, described measurement valve mode of operation comprises: measure the electric current that is caused by described electronic anesthetic vaporizer pressure regulator valve.
28. method according to claim 21 also comprises the sticking valve state of monitoring described electronic anesthetic vaporizer pressure regulator valve.
29. method according to claim 28 also comprises: the described electronic anesthetic vaporizer pressure regulator valve of conversion between opening and closed condition, so that described electronic anesthetic vaporizer pressure regulator valve is discharged from described sticking valve state.
30. method according to claim 21 also comprises the electric current that monitoring is caused by described electronic anesthetic vaporizer pressure regulator valve.
31. method according to claim 30 also comprises when the electric current of described measurement is positioned at outside the preset range, the declaration malfunction.
32. method according to claim 21 also comprises and uses hall effect sensor to monitor the revolution of the motor relevant with the electronic anesthetic vaporizer pressure regulator valve.
33. method according to claim 32 also comprises when described detected revolution is positioned at outside the preset range, the declaration malfunction.
34. a method comprises:
The electronic anesthetic vaporizer pressure regulator valve flowed be coupled to refrigeration circuit with at least one refrigeration case so that the temperature of controlling described refrigeration circuit, described electronic anesthetic vaporizer pressure regulator valve allows the evaporimeter of cold-producing medium from described refrigeration circuit to flow to compressor;
Wheel changes described electronic anesthetic vaporizer pressure regulator valve to first stop position;
Change described electronic anesthetic vaporizer pressure regulator valve in second stop position at wheel, the mode of operation of the described electronic anesthetic vaporizer pressure regulator valve of electronic induction; And
Determine the valve position of described electronic anesthetic vaporizer pressure regulator valve based on described induction.
35. method according to claim 34, wherein, described inductive operation state comprises: monitor the electric current that the motor relevant with described electronic anesthetic vaporizer pressure regulator valve causes.
36. method according to claim 34, wherein, described inductive operation state comprises: the revolution of monitoring the motor relevant with described electronic anesthetic vaporizer pressure regulator valve.
37. method according to claim 36, wherein, described monitoring revolution comprises the use hall effect sensor.
38. method according to claim 34 also comprises the electric current that monitoring is caused by described electronic anesthetic vaporizer pressure regulator valve.
39., also comprise based on the described electric current that causes and detect the sticking valve state according to the described method of claim 38.
40. according to the described method of claim 39, also being included between described first stop position and described second stop position changes described electronic anesthetic vaporizer pressure regulator valve from driving wheel, is eliminated up to described sticking valve state.
41., also comprise alarm is set when detecting described sticking valve state according to the described method of claim 39.
42. according to the described method of claim 41, also being included between described first stop position and described second stop position manual pulley changes described electronic anesthetic vaporizer pressure regulator valve, is eliminated up to described sticking valve state.
43. method according to claim 34 also comprises the broken string or the loose ends state of monitoring described evaporator pressure regulator, and when the described electric current that causes is positioned at outside the preset range, the declaration specific fault conditions.
44. method according to claim 34, wherein, described first stop position is one of full open position and complete closed position, and described second stop position is in full open position and the complete closed position another.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US55305304P | 2004-03-15 | 2004-03-15 | |
| US60/553,053 | 2004-03-15 | ||
| US11/081083 | 2005-03-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1942723A CN1942723A (en) | 2007-04-04 |
| CN100465549C true CN100465549C (en) | 2009-03-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800117419A Expired - Fee Related CN100465549C (en) | 2004-03-15 | 2005-03-15 | Evaporator pressure regulator control and diagnostics |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100465549C (en) |
| DK (1) | DK1738116T3 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6557921B2 (en) * | 2015-04-27 | 2019-08-14 | 株式会社テージーケー | Electric valve device and electric valve control device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4475686A (en) * | 1977-11-03 | 1984-10-09 | Danfoss A/S | Valve for liquid injection into a refrigerant evaporator |
| US5000009A (en) * | 1990-04-23 | 1991-03-19 | American Standard Inc. | Method for controlling an electronic expansion valve in refrigeration system |
| US5316263A (en) * | 1992-03-12 | 1994-05-31 | Kabushiki Kaisha Toshiba | System for controlling electronic expansion valve provided in refrigerating machine |
| US5867995A (en) * | 1995-07-14 | 1999-02-09 | Energy Controls International, Inc. | Electronic control of refrigeration systems |
| CN1462857A (en) * | 2003-06-05 | 2003-12-24 | 西安交通大学 | Dual temperatures vapor compression type refrigeration system and its control methods |
| CN1477356A (en) * | 2003-07-10 | 2004-02-25 | 上海交通大学 | Car air-conditioning air-supplying temp, control system |
-
2005
- 2005-03-15 CN CNB2005800117419A patent/CN100465549C/en not_active Expired - Fee Related
- 2005-03-15 DK DK05725679.4T patent/DK1738116T3/en active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4475686A (en) * | 1977-11-03 | 1984-10-09 | Danfoss A/S | Valve for liquid injection into a refrigerant evaporator |
| US5000009A (en) * | 1990-04-23 | 1991-03-19 | American Standard Inc. | Method for controlling an electronic expansion valve in refrigeration system |
| US5316263A (en) * | 1992-03-12 | 1994-05-31 | Kabushiki Kaisha Toshiba | System for controlling electronic expansion valve provided in refrigerating machine |
| US5867995A (en) * | 1995-07-14 | 1999-02-09 | Energy Controls International, Inc. | Electronic control of refrigeration systems |
| CN1462857A (en) * | 2003-06-05 | 2003-12-24 | 西安交通大学 | Dual temperatures vapor compression type refrigeration system and its control methods |
| CN1477356A (en) * | 2003-07-10 | 2004-02-25 | 上海交通大学 | Car air-conditioning air-supplying temp, control system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1942723A (en) | 2007-04-04 |
| DK1738116T3 (en) | 2016-04-11 |
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