CN108626919A - The control method and air-conditioner control system of electric expansion valve - Google Patents
The control method and air-conditioner control system of electric expansion valve Download PDFInfo
- Publication number
- CN108626919A CN108626919A CN201710152161.6A CN201710152161A CN108626919A CN 108626919 A CN108626919 A CN 108626919A CN 201710152161 A CN201710152161 A CN 201710152161A CN 108626919 A CN108626919 A CN 108626919A
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- Prior art keywords
- motor
- controller
- expansion valve
- electric expansion
- rotating speed
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
A kind of control method of electric expansion valve, control system include controller, and motor driving, Hall sensor and electric expansion valve, electric expansion valve include motor and valve body；Controller send control signal drive motor operation, and receive Hall sensor generation hall signal, according to hall signal and control signal relationship, judge motor whether step-out, if so, reduce rotating speed, if not, improve rotating speed to realize quick response；And then efficiency is improved, reduce energy consumption.
Description
【Technical field】
The present invention relates to the technical fields of refrigeration system control, and in particular to a kind of control method of electric expansion valve and
Air-conditioner control system.
【Background technology】
In the air-conditioning system of vehicle, electric expansion valve is used for accurately adjusting the flow of refrigerant, therefore electric expansion valve
The pressure difference of inlet and outlet can be with the control strategy significantly change of operating mode and air-conditioning, the refrigerant pressure of load and inlet and outlet
Difference is directly proportional.And electric expansion valve motor speed one timing certain in load, will make if the rotating speed of electric expansion valve is excessive
At motor desynchronizing, it will cause the waste of energy and the fever of motor is made to increase if rotating speed is too small.Therefore, how accurately to control
Electric expansion valve rotating speed size processed come reduce energy waste and unnecessary fever be asking of being faced of those skilled in the art
Topic.
Currently, motor control method is all to set a fixed rotating speed for motor to meet all operating modes, this method
It can ensure that motor is out-of-step free at electric expansion valve inlet and outlet pressure maximum, but when electric expansion valve inlet outlet pressure differential is relatively low
Continue to control motor with fixed rotating speed, can cause the system response time slow, long operational time, energy consumption increases, and it is swollen to influence electronics
The efficiency of swollen valve.
【Invention content】
To solve prior art problem, the present invention provides a kind of control method of electric expansion valve and control device,
Energy consumption can be reduced, improve efficiency.
A kind of control method of electric expansion valve, the electric expansion valve include motor and valve body, and the motor is stepping
Motor；The controller sends control signal and controls the motor operation, and receives the hall signal that Hall sensor monitors,
The controller according to the control signal and the hall signal judge the motor whether step-out, if so, the control
Device, which controls the motor, reduces rotating speed, if not, the controller, which controls the motor, improves rotating speed.
In such manner, it is possible to ensure that motor is acted with optimum speed always at runtime, the energy consumption of system is reduced, system is improved and rings
Answer rate.
【Description of the drawings】
Fig. 1 is electronic expansion valve controls system and electric expansion valve schematic diagram；
Fig. 2 is motor control method flow diagram；
Fig. 3 is conventional method rotational speed regulation schematic diagram；
Fig. 4 is 2 point-score rotational speed regulation schematic diagrames；
Fig. 5 is motor speed control embodiment flow diagram；
Fig. 6 is hall signal, pulse signal and motor speed correspondence schematic diagram.
【Specific implementation mode】
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only this
Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
The every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Firstly the need of explanation, the control method of electric expansion valve provided in an embodiment of the present invention and airconditioning control system
System, can be applied to control the switch degree of electric expansion valve in air-conditioner control system, can also include motor applied to other
Motor action in the system is controlled in the system of control unit, will not enumerate here.
Referring to Fig. 1, which is electronic expansion valve controls system and electric expansion valve schematic diagram.The control system includes：It is main
Controller 101, microprocessor 102, motor driving 103, Hall sensor 104；The electric expansion valve includes：Motor 105, valve body
106.Master controller 101 is communicated by LIN sends the rotating speed that control signal controls motor 105 to microprocessor 102, microprocessor
Device 102 controls the action step number of motor 105 according to the control signal received by motor driving 103.Motor driving 103 connects
Microprocessor 102 and motor 105 are connect, the control signal for receiving microprocessor 102 carrys out the operation of driving motor 105.Hall sensing
Device 104 is used for the action of 105 rotor of induction machine, and generate hall signal hair according to the rotation of 105 rotor of motor close to motor
Give microprocessor 102.The action band moving valve 106 of motor 105 moves, so as to adjust the on off state of valve body 106.The present invention
The control method and its control device for the electric expansion valve that embodiment is provided, motor is controlled applied to above-mentioned microprocessor
Make, to reduce the energy consumed during motor action, reduces the energy consumption of whole system.It wherein, can also be direct by controller
The action for controlling motor, saves microprocessor 102.
It elaborates below in conjunction with the accompanying drawings to the specific implementation mode of the present invention.
Embodiment of the method：
Referring to Fig. 2, which is the flow diagram of motor control method provided by the invention.
Motor control method provided in this embodiment, including：
S201：The step number that motor need to be walked in computational theory and the hall signal number that will be received；
Motor described in the present embodiment is stepper motor, and controller calculates theoretically according to the preset strokes of motor first
The number for the hall signal that the step number and controller of motor needs action will receive, to ensure the normal startup of motor,
Controller is controlled motor and is first started with fixed rotating speed value.
S202：Pulse signal is sent to motor, receives the hall signal that Hall sensor is sent；
After motor is started with fixed rotating speed value, controller sends the action step number that pulse signal controls motor to motor,
The action of Hall sensor induction electromotor rotor, and generate corresponding hall signal and be sent to controller.
S203：According to the pulse signal and hall signal, judge motor whether step-out；
In the present embodiment, between two adjacent hall signals, motor action two synchronizings, two of which synchronizing are
4 half steps often send a pulse signal to motor, one and half step of motor action, i.e., adjacent Hall in the case of out-of-step free
4 pulse signals are set between signal.Therefore, it can judge electricity according to the pulse signal of the hall signal and transmission that receive
Machine whether step-out.
In some possible realization methods of the present embodiment, can by count the total quantity of pulse signal that need to be sent and
The number of the pulse signal sent come judge motor whether step-out, it is specific as follows：The total quantity for the pulse signal that need to be sent and
The number of the pulse signal sent；When n-th receives the hall signal, judge to receive from the N-1 times it is described suddenly
Your signal starts the quantity for the preset the pulse signal whether number of pulses sent is more than between adjacent hall signal, this
The quantity that preset pulse signal is arranged in embodiment between adjacent hall signal is 4, and N is the integer more than 1；If
It is, then the motor desynchronizing；If it is not, then the motor is out-of-step free.
Can also by counting the number of the pulse signal between adjacent hall signal, come judge motor whether step-out；Tool
Body judges to send after the pulse signal from first hall signal to the number of the pulse signal between second hall signal
Whether amount is more than the quantity of preset pulse signal between the adjacent hall signal, in the present embodiment adjacent hall signal it
Between preset pulse signal quantity be 4, if it is, the motor desynchronizing；If it is not, then the motor is out-of-step free.
Can also by the hall signal and the pulse signal, judge the motor whether step-out, including：Statistics needs
The total quantity of the pulse signal of transmission；Judge that distance generates the described of first hall signal after sending the pulse signal
Whether the quantity of pulse signal is more than the quantity of preset pulse signal between the adjacent hall signal；If it is, described
Motor desynchronizing；If it is not, then the motor is out-of-step free；Whether can judge motor when receiving first hall signal in this way
Step-out.
Specifically, a counter can be arranged, to record the umber of pulse of the transmission from receiving the N-1 hall signal
Amount.In the present embodiment, preset pulse signal number is 4 between adjacent hall signal, is not connect yet when sending 5 pulse signals
Hall signal is received, then illustrates that the step number of motor action is less than 2, i.e. motor desynchronizing；It is just received when before sending the 5th pulse
To hall signal, then illustrate that 2 step of motor action, i.e. motor do not have step-out.
S204：When the motor desynchronizing, rotating speed is reduced to the maximum speed that step-out does not occur；When the motor does not occur
When step-out, motor speed is improved.
When step-out does not occur for motor, illustrate that the rotating speed provided to motor is less than the motor band required rotating speed of dynamic load.
At this point, the reaction rate of system should be improved by improving motor speed, to realize quick response.By controller according to practical feelings
Condition carries high-revolving control signal to motor transmission, and driving motor improves rotating speed.The raising of motor speed, the response speed of system
It can also be correspondingly improved with working efficiency.Such as within air-conditioning systems, the valve body of electric expansion valve need to move a distance to adjust
The flow of whole refrigerant, the movement speed of motor is faster compared with the prior art at this time so that valve body can reach preset position faster
It sets, the response speed of electric expansion valve faster, improves the speed of cold medium flux adjusting, to reduce the energy of air-conditioning system
Consumption.
It, can be out-of-step free to control motor by reducing rotating speed when motor desynchronizing.Without detecting the specific number of refrigerant pressure
Value and on this basis come control motor with realize reduce energy consumption purpose.For example, motor speed value includes at least minimum speed
Value, intermediate speed value, maximum (top) speed value.In the present embodiment, intermediate speed value can be divided into the first tachometer value, the second tachometer value with
And third tachometer value gradually successively decreases, and be reference with maximum (top) speed value, the order of magnitude that successively decreases is 20%, i.e. intermediate speed value can be
40%, 60%, 80% etc. of maximum (top) speed value.In the present embodiment, the rotating speed of motor is set as 5 grades, respectively V1, V2, V3, V4,
V5, wherein V1<V2<V3<V4<Rotational speed regulation is maximum speed when ensureing that motor is out-of-step free by V5.
During motor operation, refrigerant pressure is real-time change, and the load of refrigerant pressure and electric expansion valve is just
Correlation, when refrigerant pressure is low, load is small, and the rotating speed needed is also just smaller；When refrigerant pressure is high, load is big, required rotating speed
Also bigger.So in the different moments of motor operation, need that rotating speed is adjusted according to actual conditions.Rotational speed regulation
Method is varied, can step by step be adjusted according to conventional method, referring to Fig. 3, can also be adjusted using 2 point-scores, referring to Fig. 4, originally
Field technology personnel can specifically set according to actual conditions, will not enumerate here.
It should be noted that due to the load of motor will not be frequent variation, when motor commits a fault step, motor is to adjust
The rotating speed crossed runs for optimum speed.
Therefore, in some possible realization methods of the present embodiment, step S204 is specifically included：Judge the motor
Whether commit a fault step；When the motor does not commit a fault step, adjustment current rotating speed is to realize that optimum speed is run.
It is understood that when receiving second hall signal, due to when receiving first hall signal, electricity
Step-out do not occur centainly for machine, therefore just without judging whether motor commits a fault step.It, can when receiving second hall signal
With the motor directly judged according to current time, whether the judging result of step-out determines whether to adjust rotating speed, reduces
Control flow improves control efficiency.
In some possible realization methods of the present embodiment, motor action is controlled in order to be more accurate and realizes reduction
The purpose of energy consumption can accurately control the step number of motor action according to the control signal that controller is sent.By taking air-conditioning system as an example,
The master controller of air-conditioning sends a control signal to electric expansion valve to control the switch degree of electronic expansion valve body.For example, as master
Controller sends control signal control valve body when being moved to target location from current location, microprocessor according to the model of motor,
It can learn the quantity a and the number of pulses 2a that need to be sent of the synchronizing that motor need to act.The synchronizing quantity a that need to be acted due to motor
When very few, the decline that step S201-S204 may result in control efficiency is executed.Therefore, in the preferred embodiment party of the present embodiment
In case, when the synchronizing number a that motor need to act is less than 4, do not execute step S201-S204, directly to start when fixed rotating speed
Driving motor acts a steps.And when receiving first hall signal, it can be seen that the specific location of rotor.Also
Know and has sent b pulse signal.Since 2 synchronizings of motor correspond to a hall signal, and in the case where motor is out-of-step free
One hall signal corresponds to 4 pulses, this makes it possible to learn also to need to receive x hall signal, and is receiving (x+1)th suddenly
It after your signal, needs to retransmit y pulse so that motor covers a steps, wherein the difference of 2a-b divided by 4 obtains y more than x, then execute step
Rapid S201-S204.Due to can not surveying for motor load, after receiving (x+1)th hall signal, adjustment electronics rotating speed sends surplus
Y remaining pulse signal makes motor cover remaining step number with nominal speed.The adjusting of rotating speed can conventionally step by step
It adjusts, referring to Fig. 4, can also be adjusted using 2 point-scores, referring to Fig. 5, be will not enumerate herein.
Below for controlling the switch degree of electronic expansion valve body of air-conditioning system, this reality is introduced in conjunction with concrete scene
Apply the specific implementation of example.Referring to Fig. 5, in the present embodiment, preset pulse signal number is 4 between adjacent hall signal.
After electric expansion valve receives action command, the step number for needing to walk from current location to target location is calculated by microprocessor first,
It is denoted as B, while calculating in entire stroke that Hall sensor is by the number for the hall signal that will receive, if the Hall that will be will receive
Signal number is less than 2, it is believed that stroke is too short, if directly covering B hall signal numbers with nominal speed is not less than 2, starts certainly
Dynamic control rotational speed sequence, automatically controlling rotational speed sequence includes：Motor starts to act with nominal speed, monitors first Hall letter
After number, the step number that microprocessor records have acted is denoted as X；And remaining hall signal number is calculated, it is denoted as Y, and last
Motor, which reaches target location, when one hall signal occurs also needs the step number gone further, and is denoted as Z；Microprocessor, which controls motor and improves, to be turned
Speed, and monitor next hall signal and occur, the step number passed by from a upper hall signal is recorded, C is denoted as；Due to 4 arteries and veins
It rushes signal and corresponds to 1 hall signal, 1 pulse signal driving motor walks half step, according to the walked step number of motor and hall signal
Relationship come judge motor whether step-out, judgment method is：From last hall signal, if C>5 do not monitor hall signal yet,
Think that rotating speed is too fast, reduces rotating speed new record of laying equal stress on and needed the step number walked from last hall signal, while rotating speed is too fast
Position is labeled as 1；From last hall signal, if monitoring hall signal in the strokes of C≤5, it is believed that rotating speed reaches actual requirement,
Continuation is acted according to current rotating speed, if rotating speed mark position 1 at this time, it is believed that and optimum speed value has been found, rotating speed is no longer improved,
If rotating speed mark position 0 at this time, rotating speed is improved under the premise of ensureing that motor is out-of-step free, continues to improve rotating speed until finding most
Good rotating speed；When Hall sensor monitoring occurs to last 1 hall signal, microprocessor calculates what motor residue to be walked
Rotational speed regulation is nominal speed, covers remaining distance by step number.The control method of expansion valve of electric motor provided in this embodiment and its
Control device receives Hall sensor according to the electricity sensed after transmission pulse signal to motor is to control electric motor starting
The hall signal that the position of machine rotor is generated determines the step number of motor action according to hall signal.Then, believed according to Hall
Number and be sent to the pulse signal of motor, judge motor whether step-out.When the non-step-out of motor, motor speed is improved until looking for
To optimum speed, to improve system working efficiency；When motor desynchronizing, motor speed is reduced, to reduce system energy consumption.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications, or is revised as the equivalent embodiment of equivalent variations.Therefore, it is every without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, still fall within technical solution of the present invention protection in the range of.
Claims (10)
1. a kind of control method of electric expansion valve, the electric expansion valve includes motor and valve body, and the motor is stepping electricity
Machine；The step number run is needed to obtain in turn it is characterized in that, controller calculates the motor according to the preset strokes of the motor
Need the number of the control signal sent and the number of the hall signal that the controller can theoretically receive, the control
Device processed sends control signal and controls the motor operation, and receives the hall signal that Hall sensor senses, the controller
According to the control signal and the hall signal judge the motor whether step-out, if so, the controller control described in
Motor reduces rotating speed, if not, the controller, which controls the motor, improves rotating speed.
2. the control method of electric expansion valve according to claim 1, which is characterized in that the controller sends control letter
Number control motor is started with nominal speed, and the nominal speed refers to disclosure satisfy that all designs of the electric expansion valve
Whether the maximum speed of working condition, the number of the hall signal that judges the controller theoretically and can receive are less than etc.
In 2, if so, the motor has run full journey with the nominal speed, improved if not, the controller controls the motor
Rotating speed.
3. the control method of electric expansion valve according to claim 2, which is characterized in that the control signal is believed for pulse
Number, after the controller controls the motor raising rotating speed, judge whether the controller receives first hall signal, such as
Fruit is, before judgement receives first hall signal, whether the pulse signal number that the controller has been sent is more than phase
Preset pulse signal number between adjacent hall signal, if so, step-out occurs for the motor, motor speed is too fast, the control
Device processed, which controls the motor, reduces rotating speed, if not, step-out does not occur for motor, the controller, which controls the motor, to be continued to carry
High rotating speed.
4. the control method of electric expansion valve according to claim 3, which is characterized in that the rotating speed of the motor be divided into
3 grades few, every grade of rotating speed is successively increased from the nominal speed, and when the motor is out-of-step free, the controller controls the electricity
Machine improves rotating speed.
5. the control method of electric expansion valve according to claim 3, which is characterized in that the controller controls the electricity
Machine is run with nominal speed, and after monitoring first hall signal, the controller records the step number that the motor has acted
And the quantity of remaining hall signal is calculated, judge whether remaining hall signal number is less than 2, if so, the controller control
It makes the motor and whole process is covered with nominal speed, continue to act if not, controlling the motor and further increasing rotating speed, and monitor
The appearance of next hall signal.
6. the control method of electric expansion valve according to claim 3, which is characterized in that when step-out occurs for the motor
When, the controller, which controls the motor, reduces rotating speed to the maximum speed before step-out does not occur, lay equal stress on new record from it is last suddenly
Your signal plays the step number that the motor is passed by, while the rotating speed of the motor when motor to step-out to occur is in mark position 1.
7. the control method of electric expansion valve according to claim 6, which is characterized in that when step-out occurs for the motor
When, the controller, which controls the motor, reduces rotating speed to the maximum speed before step-out does not occur, lay equal stress on new record from it is last suddenly
Your signal plays the step number that the motor is passed by, while the maximum speed before step-out will not occur in mark position 0.
8. the control method of electric expansion valve according to claim 7, which is characterized in that when the motor speed reaches real
When border requires, judge whether the marker bit sets 1, if so, current rotating speed is optimum speed, the motor is transported with current rotating speed
Row；If not, the controller, which controls the motor, further increases rotating speed until finding optimum speed.
9. the control method of electric expansion valve according to claim 5, which is characterized in that the controller receives to the end
When one hall signal, the step number to be walked of motor residue is calculated, the motor is controlled and whole process is covered with nominal speed.
10. a kind of air-conditioner control system, the air-conditioner control system includes controller and electric expansion valve, and the controller includes
Main controller and microprocessor, the master controller send out control signal, and the microprocessor receives control signal and controls electronics
Expansion valve, which runs and receives Hall sensor, monitors the operation of the electric expansion valve and the hall signal of generation, the main control
Device according to the control signal and the hall signal judge the electric expansion valve whether step-out, if so, controller control
The electric expansion valve is run with nominal speed, if not, controller, which is sent, controls the electric expansion valve raising rotating speed operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710152161.6A CN108626919A (en) | 2017-03-15 | 2017-03-15 | The control method and air-conditioner control system of electric expansion valve |
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| CN201710152161.6A CN108626919A (en) | 2017-03-15 | 2017-03-15 | The control method and air-conditioner control system of electric expansion valve |
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| CN110486991A (en) * | 2019-09-09 | 2019-11-22 | 珠海格力电器股份有限公司 | Control method, device, equipment and the storage medium of electric expansion valve step-out |
| CN113162509A (en) * | 2021-03-10 | 2021-07-23 | 上海高仙自动化科技发展有限公司 | Power equipment control method and device, robot and computer readable storage medium |
| WO2022247777A1 (en) * | 2021-05-24 | 2022-12-01 | 浙江盾安人工环境股份有限公司 | Control method, control apparatus, and electronic expansion valve |
| CN117387192A (en) * | 2023-11-23 | 2024-01-12 | 宜所(广东)智能科技有限公司 | Control method and system for electronic expansion valve of air conditioner |
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| WO2022247777A1 (en) * | 2021-05-24 | 2022-12-01 | 浙江盾安人工环境股份有限公司 | Control method, control apparatus, and electronic expansion valve |
| CN117387192A (en) * | 2023-11-23 | 2024-01-12 | 宜所(广东)智能科技有限公司 | Control method and system for electronic expansion valve of air conditioner |
| CN117387192B (en) * | 2023-11-23 | 2024-04-16 | 宜所(广东)智能科技有限公司 | Control method and system for electronic expansion valve of air conditioner |
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Application publication date: 20181009 |