CN108917093A - A kind of control method and control device of air conditioner anti-frost protection - Google Patents
A kind of control method and control device of air conditioner anti-frost protection Download PDFInfo
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- CN108917093A CN108917093A CN201810668155.0A CN201810668155A CN108917093A CN 108917093 A CN108917093 A CN 108917093A CN 201810668155 A CN201810668155 A CN 201810668155A CN 108917093 A CN108917093 A CN 108917093A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 238000004378 air conditioning Methods 0.000 claims description 25
- 230000006870 function Effects 0.000 claims description 15
- 230000002528 anti-freeze Effects 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 12
- 238000013507 mapping Methods 0.000 claims description 10
- 238000005057 refrigeration Methods 0.000 claims description 7
- 238000007791 dehumidification Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 230000009993 protective function Effects 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims 1
- 108010053481 Antifreeze Proteins Proteins 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 206010008190 Cerebrovascular accident Diseases 0.000 description 1
- 208000006011 Stroke Diseases 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000009790 rate-determining step (RDS) Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- F24F11/41—Defrosting; Preventing freezing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses the control methods and control device of a kind of air conditioner anti-frost protection, by obtaining current PWM pressure regulation duty ratio according to input voltage value and revolving speed driving voltage value；Whether the difference of the duty ratio and preset standard duty ratio that judge PWM pressure regulation exceeds default control threshold value and whether the coil temperature value of evaporator is in preset temperature value or less and continues preset time；If so, determining to be in frozen state when the coil pipe of front evaporator, then controls and open anti-frost protection function to air conditioner progress anti-frost protection.Control method disclosed in this invention and control device; by the way that pressure regulation duty ratio is combined with the temperature of the coil pipe of evaporator; the evaporator of comprehensive descision air conditioner whether there is the case where frosting; therefore more accurate testing result can be obtained; the erroneous judgement for avoiding result causes the unlatching of defencive function inconvenient to the use bring of air conditioner.
Description
Technical field
The present invention relates to air conditioner controlling technology field more particularly to a kind of control method of air conditioner anti-frost protection and
Control device.
Background technique
Air conditioner is during opening refrigeration or dehumidification mode, since evaporator shunts unevenness, will lead to air conditioner steaming
Hair device freezes.And in the prior art, refrigeration anti-freeze protection control ground method is all to reach 0 DEG C or less guarantor by inner coil pipe temperature
After holding a few minutes, that is, enter anti-freeze protection control.But the above method is merely by this single side of inner coil pipe temperature
Formula carries out whether air-conditioning is in the judgement under frozen state, can not judge the whether genuine frosting of indoor evaporator, so as to cause
The erroneous judgement of anti-freeze function.
Therefore, the existing technology needs further improvement.
Summary of the invention
In view of the above shortcomings in the prior art, antifreeze it is an object of the invention to provide a kind of air conditioner for user
The control method and control device of protection overcome in the prior art whether frosting judges as evaporator only with temperature condition
Condition leads to the defect of erroneous judgement.
First embodiment of the invention provides a kind of control method of air conditioner anti-frost protection, wherein including：
Acquire the input voltage value and revolving speed driving voltage value under air-conditioning indoor fan operating status, and acquisition predetermined amount of time
The temperature value of the coil pipe of interior evaporator；
Current PWM pressure regulation duty ratio is obtained according to input voltage value and revolving speed driving voltage value；Judge the duty of the PWM pressure regulation
Whether exceed default control threshold value than the difference with preset standard duty ratio, and judge evaporator coil pipe temperature value pre-
Whether preset temperature value or less is in section of fixing time；
If the difference is in preset temperature beyond the temperature value of default control threshold value and the coil pipe within a preset period of time
Value is then controlled and opens anti-frost protection function to air conditioner progress hereinafter, then determine be in frozen state when the coil pipe of front evaporator
Anti-frost protection.
Optionally, the method also includes：
According to the input voltage of windscreens different under air-conditioning indoor fan normal operating condition, standard PWM duty cycle is calculated, is obtained defeated
Enter the mapping table between voltage, wind file rank and standard PWM duty cycle.
Optionally, the method also includes：
Corresponding PWM pressure regulation duty ratio critical value when testing air conditioner evaporator freeze, according to the standard PWM duty cycle of setting,
Duty cycle difference between the two is calculated, and the duty cycle difference is determined as to the control threshold of duty ratio.
Optionally, described to judge whether the PWM duty cycle and the difference of preset standard duty ratio exceed preset control
The step of threshold value further includes：
According to the input voltage of windscreen rank and blower locating for current air-conditioning indoor fan, searched from the mapping table
The standard PWM duty cycle to match out；
Calculate the difference between the PWM duty cycle of current PWM duty cycle and standard, and by the difference and default control threshold value
It is compared, sees if fall out the default control threshold value.
Optionally, further include before the method step：
Judge whether operational mode locating for current air-conditioning is refrigeration mode or dehumidification mode, if so, in current air conditioning chamber
Temperature value in the coil pipe predetermined amount of time of blower input voltage value, revolving speed driving voltage value and evaporator is acquired.
Optionally, when input voltage is fixed value, between the revolving speed driving voltage value and the PWM pressure regulation duty ratio
For proportional relationship.
Second embodiment provided by the invention is a kind of control device of air conditioner anti-frost protection, wherein including：It sets respectively
Set indoor machine controller on air conditioner indoor unit, indoor fan sum evaporator coil pipe；
The interior machine controller, including：Parameter collection module, data processing module and control protective module；
The parameter collection module, for acquiring input voltage value and revolving speed driving voltage under air-conditioning indoor fan operating status
The temperature value of the coil pipe of evaporator in value, and acquisition predetermined amount of time；
The data processing module, for obtaining current PWM pressure regulation duty ratio according to input voltage value and revolving speed driving voltage value；
Whether the difference of the duty ratio and preset standard duty ratio that judge the PWM pressure regulation exceeds default control threshold value, and judgement is steamed
Send out whether the temperature value of the coil pipe of device within a predetermined period of time is in preset temperature value or less；
Protective module is controlled, for when temperature value of the difference beyond default control threshold value and the coil pipe is in preset time period
When being inside in preset temperature value or less, then determines to be in frozen state when the coil pipe of front evaporator, then control and open antifreeze guarantor
Protective function carries out anti-frost protection to air conditioner.
Optionally, the data processing module is also used to according to windscreens different under air-conditioning indoor fan normal operating condition
Input voltage, calculate standard PWM duty cycle, obtain between input voltage, wind file rank and standard PWM duty cycle it is corresponding close
It is table.
Optionally, the data processing module is also used to PWM pressure regulation duty corresponding when testing air conditioner evaporator freeze
Duty cycle difference between the two is calculated according to the standard PWM duty cycle of setting than critical value, and the duty cycle difference is true
It is set to the control threshold of duty ratio.
Optionally, when input voltage is fixed value, between the revolving speed driving voltage value and the PWM pressure regulation duty ratio
For proportional relationship.
Beneficial effect, the invention discloses the control methods and control device of a kind of air conditioner anti-frost protection, pass through acquisition
Input voltage value and revolving speed driving voltage value under air-conditioning indoor fan operating status, and the pre- timing of coil pipe of acquisition evaporator
Between section temperature value；Current PWM pressure regulation duty ratio is obtained according to input voltage value and revolving speed driving voltage value；Judge the PWM
Whether the duty ratio of pressure regulation and the difference of preset standard duty ratio exceed the coil temperature value of default control threshold value and evaporator
Whether it is in preset temperature value or less and continues preset time；If temperature of the difference beyond default control threshold value and the coil pipe
When angle value is in preset temperature value or less within a preset period of time, then determine to be in frozen state when the coil pipe of front evaporator,
It then controls and opens anti-frost protection function to air conditioner progress anti-frost protection.Control method disclosed in this invention and control device,
By combining pressure regulation duty ratio with the temperature of the coil pipe of evaporator, the evaporator of comprehensive descision air conditioner whether there is frosting
The case where, therefore more accurate testing result can be obtained, the erroneous judgement of result is avoided, causes the unlatching of defencive function to sky
Adjust the use bring of device inconvenient.
Detailed description of the invention
Fig. 1 is the step flow chart of the control method of air conditioner anti-frost protection of the present invention；
The anti-frost protection structural principle block diagram of air conditioner when Fig. 2 is the method for the invention specific implementation；
Fig. 3 is the schematic block circuit diagram of indoor direct current generator in the method for the invention；
Fig. 4 is mapping table schematic diagram of the method for the invention apoplexy shelf grade not between standard PWM duty cycle；
Fig. 5 is the step flow chart of the method for the invention in a particular embodiment；
Fig. 6 is the theory structure schematic diagram of indoor controller in the control device of air conditioner anti-frost protection of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, right as follows in conjunction with drawings and embodiments
The present invention is further described.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and do not have to
It is of the invention in limiting.
Accurate judgement is carried out to whether air conditioner is in frosting state in order to realize in the present invention, in the prior art only
On the basis of being detected by the evaporator temperature to air conditioner, increases and sentenced according to the current load variation of air conditioner
It is disconnected.
Specifically, air can follow the rotation of indoor fan to pass through since indoor evaporator is not when having frosting
Evaporator realizes heat exchange, and indoor fan will bear biggish load at this time.When indoor evaporator since temperature is too low, tie
When white, air can not be normal through the fin of evaporator, and the load that indoor fan is born at this time is smaller.As it can be seen that evaporimeter frosting
It will affect the payload size of indoor fan, and indoor fan is under identical speed conditions, revolving speed driving voltage Vsp also will be with
The variation of load and change, under conditions of input voltage is certain, when loading big, revolving speed driving voltage is high, loads hour, revolving speed
Driving voltage is low；In input voltage not timing, input voltage is bigger, to reach same revolving speed, and revolving speed driving voltage is low, input
Voltage is smaller, to reach same revolving speed, and revolving speed driving voltage is high.The present invention is formulated according to above-mentioned known signal situation of change
Air conditioner anti-freeze defencive function control method and its device.
First embodiment of the invention provides a kind of control method of air conditioner anti-frost protection, as shown in Figure 1, including：
Step S1, the input voltage value and revolving speed driving voltage value under air-conditioning indoor fan operating status are acquired, and acquisition is in advance
The temperature value of the coil pipe of evaporator in section of fixing time.
Due to need to be realized according to the variation of load and the variation of temperature in this step to air conditioner whether the judgement of frosting,
Therefore need to acquire input voltage value and revolving speed driving voltage value under the indoor fan operating status of current air conditioner, to obtain
The case where present load, and using the temperature value on the temperature sensor acquisition evaporator coil of installation on an evaporator, it will
Load-factor and temperature factor combine judge current air conditioner whether frosting.
As shown in connection with fig. 2, the anti-frost protection structural principle block diagram of air conditioner when the method for the invention is embodied.It is indoor
Controller can carry out the sampling of the data such as the coil temperature of evaporator and motor speed on indoor unit；Outdoor unit control module can
To realize the controls of loads such as outdoor compressor, outer blower and the sampling of data information.Outdoor unit control module can also be simultaneously
Carry out the sample detecting of Current Voltage, the temperature sampling of outdoor environment, outdoor condenser and exhaust；Further, indoor unit with
Outdoor unit is communicated by indoor and outdoor connection, sampled data and operating condition inside and outside switch room, thus realize indoor unit to from
The data of outdoor unit acquisition are handled.
Step S2, current PWM pressure regulation duty ratio is obtained according to input voltage value and revolving speed driving voltage value；Described in judgement
Whether the duty ratio of PWM pressure regulation and the difference of preset standard duty ratio exceed default control threshold value, and judge the disk of evaporator
Whether the temperature value of pipe is in preset temperature value or less within a predetermined period of time.
Based on indoor fan under the conditions of same rotational speed, revolving speed drive voltage signal Vsp also by with the variation of load and
Variation, under input voltage certain condition, when loading big, voltage is high, loads hour, and voltage is low.Input voltage if it happens
Under change condition, input voltage is bigger, to reach same revolving speed, and Vsp voltage is lower, and input voltage is smaller, and Vsp voltage is bigger.
According to the above rule, air conditioner anti-freeze defencive function control mode is formulated.Vsp voltage adjusts accounting for for PWM by chip controls
Empty ratio, duty ratio is bigger, and Vsp is bigger, and duty ratio is smaller, and Vsp is smaller, therefore carries out PWM pressure regulation duty ratio in this step first
Calculating.
As shown in figure 3, obtaining PWM letter by the output end of voltage comparator module CM P for indoor direct current generator block diagram
Number, specifically, the negative terminal in voltage comparator inputs triangular signal, the triangular signal is what triangular-wave generator generated
The anode of standard triangular signal, voltage comparator is revolving speed drive voltage signal Vsp, and the output end of voltage comparator obtains
Pwm signal.Pwm signal is input to control chip, judge current PWM pressure regulation duty ratio and preset standard duty ratio difference whether
Beyond default control threshold value, intelligent power module, IPM driving circuit mainly completes the power amplification to pwm signal, driving
Internal power tube is to realize the driving to motor.Indispensable in motor control to test the speed, the accuracy to test the speed is directly reacted
To the precision of motor control, tested the speed using Hall revolution speed transducer realization to motor in the present invention, change of the IPM in middle low power
It is ideal power device in the controller of frequency modulation speed.
Since the evaporimeter frosting of air conditioner will lead to revolving speed drive voltage signal Vsp variation, i.e. voltage comparator just
End input signal can because evaporator whether frosting and frosting degree change, this variation can cause the pwm signal of output
Duty ratio change, i.e., different revolving speed driving voltages can obtain different pwm signals.Hereby, it is achieved that according to current defeated
Enter voltage value and revolving speed driving voltage value obtains current PWM pressure regulation duty ratio.When input voltage is fixed value, the revolving speed is driven
It is proportional relationship between dynamic voltage value and the PWM pressure regulation duty ratio.
If step S3, the described difference is located within a preset period of time beyond the temperature value of default control threshold value and the coil pipe
When below preset temperature value, then determines to be in frozen state when the coil pipe of front evaporator, then control and open anti-frost protection function
Anti-frost protection is carried out to air conditioner.
When determining the difference in above-mentioned steps S2 beyond default control threshold value, then illustrate that present load is small, evaporator
Coil pipe be likely to be at the white state of jelly, if detecting, current coil pipe is below preset temperature value within a preset period of time, such as：It is low
In subzero, then determines when the coil pipe of front evaporator is in frozen state, need to make anti-frost protection to it.It is described antifreeze
Knot protection can be stoppage protection, or enter heating mode, under anti-freeze state, carry out to the temperature of coil pipe on evaporator
Detection can then exit anti-freezing protection mode when temperature was restored to higher than predetermined temperature and duration.
Specifically, matching for the ease of realizing to get faster with present input voltage and PWM pressure regulation duty ratio
Standard PWM duty cycle, the method also includes：
According to the input voltage of windscreens different under air-conditioning indoor fan normal operating condition, standard PWM duty cycle is calculated, is obtained defeated
Enter the mapping table between voltage, wind file rank and standard PWM duty cycle.
The corresponding relationship being illustrated in figure 4 between windscreen rank and standard PWM duty cycle locating for input voltage, indoor fan
Table, wherein U1 ~ U6 is that voltage stepping is set in air conditioner voltage use scope, and Dxy is that air conditioner is different under each shelves voltage conditions
Run standard duty ratio when wind file.It, can be from according to windscreen rank at current input voltage value, indoor fan
In find out the standard PWM duty cycle to match.
Optionally, described to judge whether the PWM duty cycle and the difference of preset standard duty ratio exceed preset control
The step of threshold value further includes：
According to the input voltage of windscreen rank and blower locating for current air-conditioning indoor fan, searched from the mapping table
The standard PWM duty cycle to match out；
Calculate the difference between the PWM duty cycle of current PWM duty cycle and standard, and by the difference and default control threshold value
It is compared, sees if fall out the default control threshold value.
Specifically, the method for calculating the control threshold of duty ratio in above-mentioned steps includes：
Corresponding PWM pressure regulation duty ratio critical value when testing air conditioner evaporator freeze, according to the standard PWM duty cycle of setting,
Duty cycle difference between the two is calculated, and the duty cycle difference is determined as to the control threshold of duty ratio.
By calculating under normal circumstances, it that is to say when non-frosting on the coil pipe on the evaporator of air conditioner, successively adjust
The duty ratio of pwm signal, detection close on the PWM pressure regulation duty ratio of the state of freezing when the evaporator of air conditioner, and by current PWM tune
Pressure duty ratio is determined as the standard PWM duty cycle under windscreen locating for present input voltage value and blower.
Since only when the operational mode of air-conditioning is in refrigeration mode or dehumidification mode, air conditioner is possible to tie
Freeze situation, therefore preferably, further includes before the method step to save the electricity of antifreeze detection：
Judge whether operational mode locating for current air-conditioning is refrigeration mode or dehumidification mode, if so, in current air conditioning chamber
Temperature value in the coil pipe predetermined amount of time of blower input voltage value, revolving speed driving voltage value and evaporator is acquired.
Be explained in more detail to be made to control method provided by the present invention, below with its concrete application embodiment into
Row explanation.
In concrete application embodiment, as shown in figure 5, including the following steps：
Step H1, PWM pressure regulation duty ratio critical value corresponding when the coil freeze of testing air conditioner evaporator, according to obtaining difference
Standard PWM duty cycle under windscreen locating for input voltage and blower obtains input voltage, wind file rank and standard PWM duty cycle
Between mapping table.
Step H2, judge air conditioner be presently in operational mode whether be refrigeration mode or dehumidification mode, if so,
Step H3 is executed, this anti-frost protection rate-determining steps is otherwise terminated.
Step H3, current PWM pressure regulation duty ratio is obtained according to input voltage value and revolving speed driving voltage value；Described in judgement
Whether the duty ratio of PWM pressure regulation and the difference of preset standard duty ratio exceed default control threshold value and indoor coil pipe value
Whether it is in preset temperature value or less and continues preset time.
If step H4, the described difference is located within a preset period of time beyond the temperature value of default control threshold value and the coil pipe
When below preset temperature value, then determine that current indoor coil pipe is in frozen state, then controls and open anti-frost protection function to sky
Device is adjusted to carry out anti-frost protection.
The preset temperature is 0 DEG C, and the duration is 3min.
Acquisition data go out active in order to prevent, preferably, the above method can also include the following steps：
It will be deemed as needing to open input voltage value, driving voltage value, indoor coil pipe, the PWM pressure regulation duty of anti-frost protection
Than saving in memory, by remaining input voltage value, driving voltage value, indoor coil pipe, PWM pressure regulation duty ratio from depositing
Reservoir is removed.
In order to improve the early warning that air conditioner may break down, when it is implemented, the control method further includes：
Separated in time, to the input voltage value in memory, driving voltage value, indoor coil pipe, PWM pressure regulation duty ratio
Counted, analyzed by data processed result, if within the period air conditioner enter anti-freeze protection frequency it is higher and higher,
Reach certain value, then issue signal remind user contact maintenance personal to air conditioner carry out maintenance, wherein interval time with
Frequency is the default value of default setting.
Second embodiment provided by the invention is a kind of control device of air conditioner anti-frost protection, the control device packet
It includes：Indoor machine controller, indoor fan and the evaporator being separately positioned on air conditioner indoor unit；
As shown in fig. 6, the interior machine controller 10, including：Parameter collection module 110, data processing module 120 and control are protected
Protect module 130；
The parameter collection module 110, for acquiring input voltage value and revolving speed driving under air-conditioning indoor fan operating status
The temperature value of the coil pipe of evaporator in voltage value, and acquisition predetermined amount of time；Its function is as shown in step S1.
The data processing module 120, for obtaining current PWM pressure regulation according to input voltage value and revolving speed driving voltage value
Duty ratio；Whether the difference of the duty ratio and preset standard duty ratio that judge the PWM pressure regulation exceeds default control threshold value, and
Judge whether the temperature value of the coil pipe of evaporator within a predetermined period of time is in preset temperature value or less；Specifically, when input
It is proportional relationship between the revolving speed driving voltage value and the PWM pressure regulation duty ratio when voltage is fixed value.Its function is such as
Shown in step S2.
Protective module 130 is controlled, for when temperature value of the difference beyond default control threshold value and the coil pipe is pre-
If be in preset temperature value or less in the period, then determine to be in frozen state when the coil pipe of front evaporator, then control is opened
It opens anti-frost protection function and anti-frost protection is carried out to air conditioner.Its function is as shown in step S3.
For the ease of realizing that greater efficiency and accurate get are accounted for the standard PWM to match under current operating conditions
Empty ratio, the data processing module 120 are also used to the input electricity according to windscreens different under air-conditioning indoor fan normal operating condition
Pressure calculates standard PWM duty cycle, obtains the mapping table between input voltage, wind file rank and standard PWM duty cycle.
The frozen state of current air conditioner, the control of difference are accurately obtained according to current PWM pressure regulation duty ratio in order to realize
Threshold value processed is important parameter of measurement, therefore the data processing module, is also used to corresponding when testing air conditioner evaporator freeze
PWM pressure regulation duty ratio critical value duty cycle difference between the two is calculated, and will be described according to the standard PWM duty cycle of setting
Duty cycle difference is determined as the control threshold of duty ratio.
The invention discloses the control methods and control device of a kind of air conditioner anti-frost protection, pass through wind in acquisition air conditioning chamber
Input voltage value and revolving speed driving voltage value under machine operating status, and acquire the temperature of the coil pipe predetermined amount of time of evaporator
Value；Current PWM pressure regulation duty ratio is obtained according to input voltage value and revolving speed driving voltage value；Judge the duty of the PWM pressure regulation
Whether the coil temperature value for whether exceeding default control threshold value and evaporator than the difference with preset standard duty ratio is in pre-
If below temperature value and continuing preset time；If temperature value of the difference beyond default control threshold value and the coil pipe is default
When being in preset temperature value or less in the period, then determines to be in frozen state when the coil pipe of front evaporator, then control unlatching
Anti-frost protection function carries out anti-frost protection to air conditioner.Control method disclosed in this invention and control device, by by pressure regulation
The case where duty ratio is combined with the temperature of the coil pipe of evaporator, and the evaporator of comprehensive descision air conditioner whether there is frosting, because
This can obtain more accurate testing result, avoid the erroneous judgement of result, and the unlatching of defencive function is caused to make to air conditioner
With bring inconvenience.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to the guarantor of appended claims of the invention
Protect range.
Claims (10)
1. a kind of control method of air conditioner anti-frost protection, which is characterized in that including：
Acquire the input voltage value and revolving speed driving voltage value under air-conditioning indoor fan operating status, and acquisition predetermined amount of time
The temperature value of the coil pipe of interior evaporator；
Current PWM pressure regulation duty ratio is obtained according to input voltage value and revolving speed driving voltage value；Judge the duty of the PWM pressure regulation
Whether exceed default control threshold value than the difference with preset standard duty ratio, and judge evaporator coil pipe temperature value pre-
Whether preset temperature value or less is in section of fixing time；
If the difference is in preset temperature beyond the temperature value of default control threshold value and the coil pipe within a preset period of time
Value is then controlled and opens anti-frost protection function to air conditioner progress hereinafter, then determine be in frozen state when the coil pipe of front evaporator
Anti-frost protection.
2. the control method of air conditioner anti-frost protection according to claim 1, which is characterized in that the method also includes：
According to the input voltage of windscreens different under air-conditioning indoor fan normal operating condition, standard PWM duty cycle is calculated, is obtained defeated
Enter the mapping table between voltage, wind file rank and standard PWM duty cycle.
3. the control method of air conditioner anti-frost protection according to claim 1 or 2, which is characterized in that the method is also wrapped
It includes：
Corresponding PWM pressure regulation duty ratio critical value, accounts for according to the standard PWM of setting when the coil freeze of testing air conditioner evaporator
Empty ratio calculates the difference of duty ratio between the two, and the difference of the duty ratio is determined as to the control threshold of duty ratio.
4. the control method of air conditioner anti-frost protection according to claim 2, which is characterized in that the judgement PWM
The step of whether difference of duty ratio and preset standard duty ratio exceeds preset control threshold further include：
According to the input voltage of windscreen rank and blower locating for current air-conditioning indoor fan, searched from the mapping table
The standard PWM duty cycle to match out with the input voltage for working as front windshield rank and blower；
Calculate the difference between the PWM duty cycle of current PWM duty cycle and standard, and by the difference and default control threshold value
It is compared, sees if fall out the default control threshold value.
5. the control method of air conditioner anti-frost protection according to claim 2, which is characterized in that before the method step
Further include：
Judge whether operational mode locating for current air-conditioning is refrigeration mode or dehumidification mode, if so, in current air conditioning chamber
Temperature value in the coil pipe predetermined amount of time of blower input voltage value, revolving speed driving voltage value and evaporator is acquired.
6. the control method of air conditioner anti-frost protection according to claim 5, which is characterized in that when input voltage is to fix
It is proportional relationship between the revolving speed driving voltage value and the PWM pressure regulation duty ratio when value.
7. a kind of control device of air conditioner anti-frost protection, which is characterized in that including：It is separately positioned on the room on air conditioner indoor unit
The coil pipe of interior machine controller, indoor fan and evaporator；
The interior machine controller, including：Parameter collection module, data processing module and control protective module；
The parameter collection module, for acquiring input voltage value and revolving speed driving voltage under air-conditioning indoor fan operating status
The temperature value of the coil pipe of evaporator in value, and acquisition predetermined amount of time；
The data processing module, for obtaining current PWM pressure regulation duty ratio according to input voltage value and revolving speed driving voltage value；
Whether the difference of the duty ratio and preset standard duty ratio that judge the PWM pressure regulation exceeds default control threshold value, and judgement is steamed
Whether the temperature value for sending out the coil pipe of device is in preset temperature value or less within a predetermined period of time；
Protective module is controlled, for when temperature value of the difference beyond default control threshold value and the coil pipe is in preset time period
When being inside in preset temperature value or less, then determines to be in frozen state when the coil pipe of front evaporator, then control and open antifreeze guarantor
Protective function carries out anti-frost protection to air conditioner.
8. the control device of air conditioner anti-frost protection according to claim 7, which is characterized in that the data processing mould
Block is also used to calculate standard PWM duty cycle according to the input voltage of windscreens different under air-conditioning indoor fan normal operating condition,
Obtain the mapping table between input voltage, wind file rank and standard PWM duty cycle.
9. the control device of air conditioner anti-frost protection according to claim 7, which is characterized in that the data processing mould
Block is also used to PWM pressure regulation duty ratio critical value corresponding when the coil freeze of testing air conditioner evaporator, according to the standard of setting
PWM duty cycle calculates the difference of duty ratio between the two, and the difference of the duty ratio is determined as to the control threshold of duty ratio
Value.
10. the control device of air conditioner anti-frost protection according to claim 7, which is characterized in that when input voltage is solid
It is proportional relationship between the revolving speed driving voltage value and the PWM pressure regulation duty ratio when definite value.
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| CN110686361A (en) * | 2019-10-15 | 2020-01-14 | 广东美的暖通设备有限公司 | Fresh air machine control method, fresh air machine and computer readable storage medium |
| CN110793159A (en) * | 2019-11-19 | 2020-02-14 | 宁波奥克斯电气股份有限公司 | Air conditioner refrigeration anti-freezing protection control method and device and air conditioner |
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| CN112728741A (en) * | 2020-12-30 | 2021-04-30 | 珠海拓芯科技有限公司 | Control method and device of air conditioner fan and air conditioner |
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