CN116045383A - Air conditioner - Google Patents
Air conditioner Download PDFInfo
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- CN116045383A CN116045383A CN202310088891.XA CN202310088891A CN116045383A CN 116045383 A CN116045383 A CN 116045383A CN 202310088891 A CN202310088891 A CN 202310088891A CN 116045383 A CN116045383 A CN 116045383A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/08—Compressors specially adapted for separate outdoor units
- F24F1/10—Arrangement or mounting thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F25B49/022—Compressor control arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Biomedical Technology (AREA)
- Human Computer Interaction (AREA)
- Health & Medical Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The embodiment of the invention provides an air conditioner, and relates to the technical field of electric appliances. The air conditioner can improve the success rate of starting the compressor through software algorithm optimization. The air conditioner includes: an indoor unit and an outdoor unit; the indoor unit is electrically connected with the outdoor unit; the outdoor unit includes a compressor; the compressor comprises a motor; the outdoor unit further includes a controller configured to: setting an upper limit of starting current and a lower limit of starting current of the compressor; controlling the compressor to start at an initial start current value; the initial starting current value is any current value between the starting current upper limit and the starting current lower limit; if the starting fails, the failure type of the starting failure is recorded, the starting current for restarting the compressor is determined according to different failure types, and if the restarting current reaches the upper limit of the starting current and the lower limit of the starting current, the compressor still fails to restart, the step of controlling the compressor to start with the initial starting current value is returned.
Description
Technical Field
The invention relates to the technical field of electric appliances, in particular to an air conditioner.
Background
With the development of scientific technology, the application of air conditioners is more and more common, and more people's daily lives are closely related to the air conditioners.
The air conditioner comprises a compressor, and at present, the starting current of the compressor is a fixed value, so that the following problems are caused: for a single rotor compressor in an air conditioner outdoor unit, the load torques corresponding to different mechanical angles in one mechanical cycle are different. When the machine is restarted, the load torque is different when the machine is started due to different shutdown angles, if the machine is stopped at the angle with the maximum load torque, the machine needs to be started by larger starting current when the machine is restarted, otherwise, the machine is likely to be stopped due to too small current, the machine is failed to start, and the machine is continuously failed to start. Or, for the compressor manufacturer, the motor parameters and the mechanical parameters of each produced compressor cannot be guaranteed to be completely consistent, for example, certain compressors may have higher friction coefficients, and when the compressor is started by applying larger starting current, the compressor is suitable, and when the starting current is smaller, the compressor has a high probability of starting failure. The above-mentioned problems may occur even when the press is subjected to parameter drift such as demagnetization due to high temperature or other factors, or other mechanical abnormality such as mechanical wear due to long-term operation, and the magnitude of the starting current needs to be adjusted.
Disclosure of Invention
The embodiment of the invention provides an air conditioner, which controls a compressor to start through a controller in an outdoor unit and improves the success rate of starting the compressor by adjusting the starting current.
The air conditioner includes: an indoor unit and an outdoor unit; the indoor unit is electrically connected with the outdoor unit; the outdoor unit includes a compressor; the compressor includes a motor; the outdoor unit further includes a controller configured to:
setting an upper limit of starting current and a lower limit of starting current of the compressor; controlling the compressor to start at an initial start current value; wherein the initial starting current value is any current value between the starting current upper limit and the starting current lower limit; if the starting fails, recording a failure type of the starting failure, and determining the restarting starting current of the compressor according to different failure types, wherein the restarting starting current is a set stepping current value which is gradually increased or gradually decreased on the basis of the starting current of the last starting, and the compressor is controlled to restart with the restarting starting current until the restarting is successful; and if the restarted starting current reaches the upper starting current limit or the lower starting current limit, the compressor still fails to restart, and the step of controlling the compressor to start at the initial starting current value is returned.
In some embodiments, the compressor start-up procedure includes: a rotor positioning process, an open-loop dragging process and a closed-loop running process; in the rotor positioning process, the rotating speed of the rotating speed ring is set to be zero, and the D-axis current is set to be the starting current; in the open-loop dragging process, the rotating speed of the rotating speed ring is increased to a closed-loop rotating speed value required by a closed-loop cutting process at a set frequency increasing rate in a second set time, and the D-axis current is kept unchanged; in the closed-loop running process, the rotating speed of the rotating speed ring is a closed-loop rotating speed value, the rotating speed ring introduces estimated rotating speed feedback, and the D-axis current is reduced to 0.
In some embodiments, the compressor further comprises a proportional-integral-adjustment controller configured to receive a difference between the rotational speed of the rotational speed loop and an estimated rotational speed for calculation of a current loop.
In some embodiments, the fault types include: a first type of fault and a second type of fault; the first type of fault includes: the estimated rotating speed is smaller than a lower rotating speed limit threshold value and exceeds a third set time to cause the compressor to stop in a fault manner; the second type of fault includes: the estimated rotational speed is greater than a lower rotational speed threshold and exceeds a third set time resulting in a failed shutdown of the compressor.
In some embodiments, the first type of fault further comprises: the estimated counter potential is less than the theoretical counter potential threshold for more than a fourth set time, resulting in a failed shutdown of the compressor; the rotating speed ring is switched from an open-loop stage to a closed-loop stage, and the difference between the rotating speed of the rotating speed ring and the estimated rotating speed is larger than a first set threshold value for exceeding a fifth set time, so that the compressor is stopped in a fault manner; the first set threshold is a positive number.
In some embodiments, the second type of fault further comprises: the rotating speed ring is switched from an open-loop stage to a closed-loop stage, and the difference between the estimated rotating speed and the rotating speed of the rotating speed ring is larger than a second set threshold value and exceeds a sixth set time; when the phase current exceeds a set threshold value in the open-loop phase or the open-loop phase of the rotating speed ring is closed, the compressor is stopped; the second set threshold is a positive number.
In some embodiments, the controller is configured to determine that the restarted starting current is a step-up setting current value that is gradually increased over the last started starting current until the start is successful, in the case where the type of fault that failed the first start is a first type of fault; wherein the restarting starting current is less than or equal to the starting current upper limit.
In some embodiments, the controller is configured to determine that the restarted starting current is a step-by-step current value that is gradually reduced over the last started starting current until the start is successful, in the event that the type of fault that failed the first start is a first type of fault; wherein the restarting starting current is greater than or equal to a starting current lower limit.
In some embodiments, after the compressor fails to start, the controller delays the compressor for a first set time and then controls the compressor to restart; the first set time is 3min.
In some embodiments, the motor is a permanent magnet synchronous motor.
Based on the above technical solution, the air conditioner provided in some embodiments of the present invention identifies the fault type when the compressor fails to start through the controller, so that the controller controls the compressor to increase or decrease the starting current to improve the success rate of the compressor starting.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and do not limit the invention.
Fig. 1 is a system block diagram of an air conditioner according to an embodiment of the present invention;
fig. 2 is a system block diagram of an outdoor unit according to an embodiment of the present invention;
fig. 3 is a system block diagram of another outdoor unit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a load moment variation in a unit mechanical cycle of a single rotor compressor according to an embodiment of the present invention;
fig. 5 is a system block diagram of an outdoor unit according to another embodiment of the present invention;
fig. 6 is a system block diagram of an outdoor unit according to another embodiment of the present invention;
FIG. 7 is a flow chart of a compressor start-up portion provided by an embodiment of the present invention;
FIG. 8 is a flow chart of another compressor start-up portion provided by an embodiment of the present invention;
fig. 9 is an overall flowchart of starting a compressor according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. In addition, when describing a pipeline, the terms "connected" and "connected" as used herein have the meaning of conducting. The specific meaning is to be understood in conjunction with the context.
In embodiments of the invention, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
As described in the background art, currently, for a single rotor compressor in an air conditioner outdoor unit, load torques corresponding to different mechanical angles within one mechanical cycle are different. When the machine is restarted, the load torque is different when the machine is started due to different shutdown angles, if the machine is stopped at the angle with the maximum load torque, the machine needs to be started by larger starting current when the machine is restarted, otherwise, the machine is likely to be stopped due to too small current, the machine is failed to start, and the machine is continuously failed to start.
As shown in fig. 4, fig. 4 is a schematic diagram of load moment variation in a unit mechanical cycle of a single-rotor compressor according to an embodiment of the present invention. The relation between the crank angle and the resistance moment is shown in the figure, only the crank angle is 180 degrees, the resistance moment reaches the maximum, the crank angle is between 0 and 180 degrees, and the resistance moment is continuously increased from zero; the crank angle is between 180 degrees and 360 degrees, and the resistance moment is continuously reduced from the maximum value to zero. When the compressor is stopped and restarted each time, the stopping angles of the compressors are different, the corresponding resistance moment is different, the corresponding loads of the compressors are different when the compressors are started, and the required starting currents are different. The starting current required for restarting the compressor again after each time the compressor is stopped is different, and if the current value of the starting current is not changed, the stopping of the compressor, that is, the starting failure of the compressor, is highly likely to occur.
The crankshaft of the engine rotates for 360 degrees, the ignition time of the ignition engine is set by taking the crank angle as a reference, the fuel injection time of the compression engine is set, the opening and closing time and the opening and closing angle of the intake valve and the exhaust valve are set, and the guiding distribution of the piston is controlled. The crank angle is expressed in degrees of rotation of the crankshaft at 1 degrees of 360 degrees, typically 0 degrees of rotation at piston motion to top dead center.
Wherein, the formula of the resistance moment is as follows: moment of resistance = resistance x resistance action point to spindle vertical distance.
The failure to start the compressor may also be related to the compressor manufacturer: for compressor manufacturers, the motor parameters and the mechanical parameters of each produced compressor cannot be guaranteed to be completely consistent, for example, certain compressors may have higher friction coefficients, and the compressors are properly started by applying larger starting currents, so that the compressors have a larger probability of failure in starting when the starting currents are smaller.
In some cases, the above-mentioned problems are also caused in cases where the press is subjected to parameter drift such as demagnetization due to high temperature or other factors, or other mechanical anomalies such as mechanical wear due to long-term operation, and the magnitude of the starting current needs to be adjusted.
Based on this, an embodiment of the present invention provides an air conditioner, as shown in fig. 1, an air conditioner 1000 includes: an outdoor unit 100 and an indoor unit 200; the indoor unit 200 is electrically connected to the outdoor unit 100.
In some embodiments, as shown in fig. 2, the outdoor unit 100 includes: a compressor 1; as shown in fig. 3, the compressor 1 includes a motor 11. The compressor 1 is configured to temperature-regulate the air conditioner 1000, and the motor 11 is configured as a power source of the above-described compressor 1.
In some embodiments, the motor is a permanent magnet synchronous motor.
The permanent magnet synchronous motor uses the permanent magnet to provide excitation, so that the motor structure is simpler, the processing and assembly cost is reduced, a collecting ring and an electric brush which are easy to cause problems are omitted, and the operation reliability of the motor is improved; and because exciting current is not needed, exciting loss is avoided, and the efficiency and the power density of the motor are improved.
As shown in fig. 5, the embodiment of the present invention provides an outdoor unit further comprising a controller 2, wherein the controller 2 is electrically connected with the compressor 1; the controller 2 is configured to: setting an upper limit of starting current and a lower limit of starting current of the compressor; controlling the compressor to start at an initial start current value; the initial starting current value is any current value between the starting current upper limit and the starting current lower limit.
If the starting fails, recording the failure type of the starting failure, and determining the restarting starting current of the compressor according to different failure types, wherein the restarting starting current is a set stepping current value which is gradually increased or gradually decreased on the basis of the starting current of the last starting, and controlling the compressor to restart with the restarting starting current until the restarting is successful; if the restarting starting current reaches the upper starting current limit and the lower starting current limit, the compressor still fails to restart, and the step of controlling the compressor to start with the initial starting current value is returned.
The embodiment of the invention provides an air conditioner, and the starting of a compressor 1 is controlled by a controller 2. First the starting current I (I) has an upper starting current limit I max And a lower starting current limit I min The starting current I (I) exceeds the starting current upper limit I max Or the starting current I (I) is lower than the starting current lower limit I min Are considered to be start-up failures.
Wherein the upper limit of the starting current I max Refers to the maximum value allowed in the starting current of the compressor, and the lower limit I of the starting current min Refers to the minimum allowed in the compressor starting current.
So the initial starting current value I (I) is the starting current upper limit I max And a lower starting current limit I min Any current value in between. If the starting is successful by the initial current value I (I), no processing is carried out, and the compressor 1 continues to run; if the starting fails with the initial current value I (I), the controller 2 detects the fault type and selects different starting modes according to different fault types. At this time, the controller needs to restart again after stopping the machine for a first set time in a delayed manner, and judges according to the type of the fault just detected:
under the condition that the fault type of the first starting failure is a first type of fault, determining that the starting current of restarting is gradually increased by a set stepping current value on the starting current of last starting until the starting is successful; wherein the restarting starting current is less than or equal to the starting current upper limit I max 。
Under the condition that the fault type of the first starting failure is the second type of fault, determining that the starting current of restarting is a step-by-step current value which is gradually reduced on the starting current of the last starting until the starting is successful; wherein the restarting starting current is greater than or equal to the starting current lower limit I min 。
If the process still fails to start, the initial starting current value is returned to restart, and the process is repeated.
In some embodiments, after the compressor fails to start, the controller delays the first set time and then controls the compressor to restart; the first set time is 3min.
That is, the first start-up failure is a first type of failure due to the start-up current being too small. In order to restart, the starting current needs to be gradually increased, that is, the restarting starting current is gradually increased by a set stepping current value on the starting current started last time until the starting is successful. Meanwhile, after the start failure of the compressor, the compressor can be restarted at intervals of 3 minutes, so that the compressor is better protected.
The first start-up failure is due to the fact that the start-up current is too large, which results in a second kind of failure. In order to restart, the starting current needs to be gradually reduced, that is, the restarting starting current is a set stepping current value gradually reduced on the starting current started last time until the starting is successful. Meanwhile, after the start failure of the compressor, the compressor can be restarted at intervals of 3 minutes, so that the compressor is better protected.
In summary, in some embodiments of the present invention, the air conditioner identifies the fault type when the compressor fails to start through the controller, so that the controller controls the compressor to increase or decrease the starting current to improve the success rate of the compressor start.
In some embodiments, the compressor 1 start-up procedure described above includes: a rotor positioning process, an open-loop dragging process and a closed-loop running process; in the rotor positioning process, the rotating speed of the rotating speed ring is set to be zero, and the D-axis current is set to be the starting current; in the open-loop dragging process, the rotating speed of the rotating speed ring is increased to a closed-loop rotating speed value required by the closed-loop cutting process at a set frequency increasing rate in a second set time, and the D-axis current is kept unchanged; in the closed-loop running process, the rotating speed of the rotating speed ring is a closed-loop rotating speed value, the rotating speed ring introduces estimated rotating speed feedback, and the D-axis current is reduced to 0.
The rotating speed of the rotating speed ring has different rotating speed values at different stages, which are equivalent to actual rotating speeds; the estimated rotational speed is the rotational speed that has been set before the compressor is started.
In some embodiments, the above-described compressor 1 further comprises a proportional-integral-adjustment controller configured to receive a difference between the rotational speed of the rotational speed ring and the estimated rotational speed for calculation of the current ring.
The PI controller (proportional integral controller) is a linear controller which forms a control deviation based on a given value and an actual output value, and forms a control amount by linearly combining the proportional and integral of the deviation to control a controlled object.
Optionally, the fault types include: a first type of fault and a second type of fault; the first type of fault includes: the estimated rotating speed is smaller than the lower rotating speed threshold value and exceeds a third set time to cause the fault shutdown of the compressor; the second type of fault includes: the estimated rotational speed is greater than the lower rotational speed threshold and exceeds the third set time resulting in a failed compressor shutdown.
In some embodiments, the first type of fault further comprises: the estimated counter potential is less than the theoretical counter potential threshold for more than a fourth set time, resulting in a compressor failure shutdown; the rotating speed ring is switched from an open-loop stage to a closed-loop stage, and the difference between the rotating speed of the rotating speed ring and the estimated rotating speed is larger than a first set threshold value for more than a fifth set time, so that the compressor is stopped in a fault manner; and the first set threshold is positive.
In some embodiments, the second type of fault further comprises: the rotating speed ring is switched from an open-loop stage to a closed-loop stage, and the difference between the estimated rotating speed and the rotating speed of the rotating speed ring is larger than a second set threshold value and exceeds a sixth set time; when the phase current exceeds a set threshold value in the open-loop stage or the open-loop stage of the rotating speed ring is switched to the closed-loop stage, the compressor is stopped; and the second set threshold is positive.
The second set time, the third set time, the fourth set time, the fifth set time, and the sixth set time are all set according to actual conditions.
As shown in fig. 5 and 6, the controller 2 is configured to determine that the restart starting current is a set stepping current value that is gradually increased over the last start starting current until the start is successful, in the case where the failure type of the first start failure is the first type of failure; wherein the restart starting current is less than or equal to the starting current upper limit. The controller is further configured to determine that the restarted starting current is a step-by-step reduction set stepping current value on the starting current started last time until the starting is successful, in the case that the fault type of the first starting failure is the second type of fault; wherein the restarting starting current is greater than or equal to the starting current lower limit.
As shown in fig. 9, fig. 9 is an overall flowchart of starting a compressor according to an embodiment of the present invention.
The start of the compressor 1 is controlled by the controller 2:
s101, starting with an initial current value I (I).
S102, judging whether starting with the initial current value I (I) can be successfully started.
S103, if the starting is successful by the initial current value I (I), no processing is carried out, and the compressor continues to run.
As shown in fig. 7 and 9, if the initial current value I (I) fails to start, the controller detects the fault type, and selects different starting modes according to different fault types.
S104, judging whether the fault type is a first type of fault.
S105, if the first type of fault is a first type of fault, the restarting current is I (i+1) =i (I) +Δi.
That is, in the case where the type of the fault of the first start failure is the first type of fault, it is determined that the starting current for restarting is a set stepping current value which is gradually increased on the starting current for last starting until the starting is successful; wherein the restart starting current is less than or equal to the starting current upper limit. I (i+1) =i (I) +Δi.
S106, judging whether the restarting is successful or not.
And S107, if the starting current I (i+1) =I (I) +delta I is successful, no processing is performed, and the compressor continues to run.
S108, if the starting current I (i+1) =I (I) +delta I is unsuccessful, judging whether the starting current meets I (i+1). Ltoreq.I max 。
For step S108, the controller 2 is required to determine whether the restart starting current I (i+1) is less than or equal to the starting current upper limit I max If the I (i+1) is less than or equal to I max Then the current value is continuously increased according to I (i+1) =I (I) +delta I until I (i+1) exceeds the upper limit of the starting current, if I (i+1) is not satisfied to be less than or equal to I max Returning to step S101, the controller 2 controls the compressor 1 to restart at the initial current value I (I), and repeats the above steps S101 to S108.
As shown in fig. 8 and 9, if the initial current value I (I) fails to start, the controller detects the fault type, and selects different starting modes according to different fault types.
S104, judging whether the fault type is a first type of fault.
S201, the fault type is not a first type of fault, and the fault type is a second type of fault.
S202, if the second type of faults exist, restarting starting current is I (i+1) =I (I) -delta I.
That is, in the case where the failure type of the first start failure is the second type of failure, it is determined that the start current of the restart is a set stepping current value that is gradually decreased over the start current of the last start until the start is successful, i.e., I (i+1) =i (I) - Δi.
S203, judging whether the restarting is successful or not.
S204, if the starting current I (i+1) =I (I) -delta I is successful, no processing is performed, and the compressor 1 continues to run.
S205, if the starting current I (i+1) =I (I) -DeltaI is unsuccessful, judging whether the starting current meets I (i+1) > I min 。
For step S205, the controller 2 is required to determine whether I (i+1) is greater than or equal to the lower limit of the start current I min If the I (i+1) is not less than I min Continuing to decrease the current value according to I (i+1) =i (I) - Δi until I (i+1) is below the lower starting current limit; if not meeting I (i+1) is not more than I min Returning to step S101, the controller 2 controls the compressor 1 to restart at the initial current value I (I), and repeats the above steps S101 to S104 and steps S201 to S205.
According to the embodiment of the invention, the air conditioner identifies the fault type when the compressor fails to start through the controller, so that the controller controls the compressor to increase or decrease the starting current to improve the success rate of the starting of the compressor. For compressor manufacturers, the motor parameters and the mechanical parameters of each produced compressor cannot be guaranteed to be completely consistent, the method can better adapt to the discrete difference of single bodies of the compressor, and different starting currents can be applied to different compressor body expressions; meanwhile, the starting success rate can be effectively improved under the conditions that parameters of the press drift such as demagnetization caused by high temperature or other factors or other mechanical anomalies such as mechanical abrasion caused by long-time operation.
The present invention is not limited to the above embodiments, and any changes or substitutions within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. An air conditioner, comprising: an indoor unit and an outdoor unit;
the indoor unit is electrically connected with the outdoor unit;
the outdoor unit includes a compressor; the compressor includes a motor;
the outdoor unit further includes a controller configured to:
setting an upper limit of starting current and a lower limit of starting current of the compressor;
controlling the compressor to start at an initial start current value; wherein the initial starting current value is any current value between the starting current upper limit and the starting current lower limit;
if the starting fails, recording a failure type of the starting failure, and determining the restarting starting current of the compressor according to different failure types, wherein the restarting starting current is a set stepping current value which is gradually increased or gradually decreased on the basis of the starting current of the last starting, and the compressor is controlled to restart with the restarting starting current until the restarting is successful; and if the restarted starting current reaches the upper starting current limit or the lower starting current limit, the compressor still fails to restart, and the step of controlling the compressor to start at the initial starting current value is returned.
2. The air conditioner of claim 1, wherein the compressor start-up process comprises: a rotor positioning process, an open-loop dragging process and a closed-loop running process;
in the rotor positioning process, the rotating speed of the rotating speed ring is set to be zero, and the D-axis current is set to be the starting current;
in the open-loop dragging process, the rotating speed of the rotating speed ring is increased to a closed-loop rotating speed value required by a closed-loop cutting process at a set frequency increasing rate in a second set time, and the D-axis current is kept unchanged;
in the closed-loop running process, the rotating speed of the rotating speed ring is a closed-loop rotating speed value, the rotating speed ring introduces estimated rotating speed feedback, and the D-axis current is reduced to 0.
3. The air conditioner of claim 2, wherein the compressor further comprises a proportional integral adjustment controller configured to receive a difference between a rotational speed of the rotational speed loop and an estimated rotational speed for calculation of a current loop.
4. An air conditioner according to claim 3, wherein the fault type comprises: a first type of fault and a second type of fault;
the first type of fault includes: the estimated rotating speed is smaller than a lower rotating speed limit threshold value and exceeds a third set time to cause the compressor to stop in a fault manner;
the second type of fault includes: the estimated rotational speed is greater than a lower rotational speed threshold and exceeds a third set time resulting in a failed shutdown of the compressor.
5. The air conditioner of claim 4, wherein the first type of fault further comprises:
the estimated counter potential is less than the theoretical counter potential threshold for more than a fourth set time, resulting in a failed shutdown of the compressor;
the rotating speed ring is switched from an open-loop stage to a closed-loop stage, and the difference between the rotating speed of the rotating speed ring and the estimated rotating speed is larger than a first set threshold value for exceeding a fifth set time, so that the compressor is stopped in a fault manner;
the first set threshold is a positive number.
6. The air conditioner of claim 4, wherein the second type of fault further comprises:
the rotating speed ring is switched from an open-loop stage to a closed-loop stage, and the difference between the estimated rotating speed and the rotating speed of the rotating speed ring is larger than a second set threshold value and exceeds a sixth set time;
when the phase current exceeds a set threshold value in the open-loop phase or the open-loop phase of the rotating speed ring is closed, the compressor is stopped;
the second set threshold is a positive number.
7. The air conditioner according to claim 5 or 6, wherein the controller is configured to determine that the restarted starting current is a step-up setting stepping current value which is gradually increased from the starting current of the last start until the start is successful, in the case that the type of failure of the first start is a first type of failure; wherein the restarting starting current is less than or equal to the starting current upper limit.
8. The air conditioner according to claim 5 or 6, wherein the controller is configured to determine that the restarted starting current is a set stepping current value that is gradually reduced on the starting current of the last start until the start is successful, in the case where the type of failure of the first start failure is a first type of failure; wherein the restarting starting current is greater than or equal to a starting current lower limit.
9. The air conditioner of claim 1, wherein the controller delays a first set time after the start-up of the compressor fails, and controls the compressor to restart; the first set time is 3min.
10. The air conditioner of claim 1, wherein the motor is a permanent magnet synchronous motor.
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