CN107940694A - The exhaust protection control method and system of a kind of air conditioner - Google Patents
The exhaust protection control method and system of a kind of air conditioner Download PDFInfo
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- CN107940694A CN107940694A CN201711134353.0A CN201711134353A CN107940694A CN 107940694 A CN107940694 A CN 107940694A CN 201711134353 A CN201711134353 A CN 201711134353A CN 107940694 A CN107940694 A CN 107940694A
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Abstract
Control method and system are protected in a kind of exhaust the invention discloses air conditioner.The control method includes：Delivery temperature threshold values T is set0With delivery temperature duration threshold values t0；Detect the delivery temperature T of compressorExhaustAnd temperature duration t；It will detect delivery temperature TExhaustWith the delivery temperature threshold value T0It is compared, and by the duration t of delivery temperature compared with the time threshold t0, and the exhaust protected mode of compressor is judged according to comparative result.Method and system proposed by the present invention efficiently avoid the frequent frequency conversion of press or startup-shutdown, improve system service efficiency and the service life of compressor.
Description
Technical field
The present invention relates to air conditioner technical field, the exhaust of more particularly to a kind of air conditioner protects control method and is
System.
Background technology
The exhaust protection control method that traditional convertible frequency air-conditioner uses is that the temperature sensing package at compressor air-discharging end detects
When refrigerant temperature exceedes delivery temperature limit value, instruction is sent by the program of controller, compressor frequency is reduced or makes pressure
Contracting machine shuts down work, and when delivery temperature reaches safety value, controller sends raising frequency or start is specified, so as to fulfill to compression
The protection of machine.
Although the method that above-mentioned traditional frequency conversion air-conditioning uses plays the role of exhaust protection, but there are following defect：It is single
Purely according to delivery temperature to determine whether enable frequency reducing or stoppage protection, it can not ensure the accuracy judged, cause to press with this
The frequent frequency conversion of contracting machine or startup-shutdown, influence system service efficiency and the service life of compressor, are performed especially by frequency reducing
Exhaust protection can cause unit efficiency to adjust to control conflict mutually between frequency reducing protection, cause to occur system logic judge it is chaotic
Possibility.
Therefore in view of the above-mentioned drawbacks of the prior art, be necessary carry out developmental research, can accurate judgement to provide one kind
The control method of protection is vented, to improve the service life of system service efficiency and compressor.
The content of the invention
To solve technical problem existing in the prior art, the present invention proposes a kind of exhaust protection control method of air conditioner,
This method is protected according to delivery temperature and the temperature duration to determine whether enabling exhaust, to ensure the accuracy judged,
The service life of raising system service efficiency and compressor.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of exhaust protection control method of air conditioner, includes the following steps：
Delivery temperature threshold values T is set0With delivery temperature duration threshold values t0；Wherein, the delivery temperature threshold values T0Specific bag
Include：Limit frequency temperature T1, frequency reducing temperature T2, stoppage protection temperature T3And can recovery temperature T4；
Detect the delivery temperature T of compressorExhaustAnd temperature duration t；
It will detect delivery temperature TExhaustWith the delivery temperature threshold value T0It is compared, and the duration t by delivery temperature
With the time threshold t0It is compared, and the exhaust protected mode of compressor is judged according to comparative result.
The delivery temperature threshold values T0Including：Limit frequency temperature T1, frequency reducing temperature T2, stoppage protection temperature T3With can recover temperature
Spend T4, and T3＞ T2＞ T1＞ T4, T1-T4＞ tIfDEG C, tIfIt is preferred that 5 DEG C.
The exhaust protected mode includes limit frequency protected mode, frequency reducing protected mode and stoppage protection pattern.
Preferably, as compressor exhaust temperature TExhaust≥T4+ 5, and the duration be more than or equal to 5 seconds when, into limit frequency protect
Pattern, adjusts the aperture of electric expansion valve.
Preferably, the aperture of electric expansion valve is adjusted to K1=original aperture K+5 steps, and limit compressor frequency and rise；When
Detect delivery temperature TExhaust≤T4When, return to the original aperture of electric expansion valve.
Compressor exhaust temperature T was detected when continuous 3 secondsExhaust≥T3When, stoppage protection pattern is directly entered, until detection
To TExhaust＜ T4When, start can be started.
When compressor air-discharging detects T2≤TExhaust＜ T3When, and when the duration is 5 seconds, into frequency reducing protected mode, drop
Frequency 5Hz, and keep the frequency 2 seconds, if T afterwards2≤TExhaust＜ T3When, then judge：
If a, TExhaust＜ T4When, maintain 3 minutes, system is run by the capacity calculation frequency of logic again；
If b, T4≤TExhaust＜ T2When, then keep the frequency run 30 minutes, follow-up system again according to control logic ability meter
Calculate frequency operation；
If c, continuous 3 seconds detect TExhaust≥T3When, system is directly entered stoppage protection pattern, until detecting TExhaust＜ T4Shi Fang
Can starting up.
Preferably, when compressor exhaust temperature sensor detects T1≤TExhaust＜ T2, and the duration was more than or equal to 5 seconds
When, into limit frequency protected mode.
Preferably, electronic expansion valve opening K=original aperture K+10 steps are adjusted, if detecting afterwardsT is vented≤T4, and keep this
Temperature is more than 3 seconds, then de-preservation pattern, electric expansion valve return to former aperture operation；If detect T1≤TExhaust＜ T2, and
When duration is more than 5 seconds, then into frequency reducing protected mode.
The present invention also proposes a kind of exhaust Protection control system of air conditioner, including：
Initial value setup module, for setting delivery temperature threshold values T0With delivery temperature duration threshold values t0, wherein, the row
Gas threshold temperature T0Specifically include：Limit frequency temperature T1, frequency reducing temperature T2, stoppage protection temperature T3And can recovery temperature T4, and T3
＞ T2＞ T1＞ T4, T1-T4＞ tIfDEG C, tIfIt is preferred that 5 DEG C；
Detection module, for detecting the delivery temperature T of compressorExhaustAnd the time t of the constant temperature；
Control module, for that will detect delivery temperature TExhaustWith the delivery temperature threshold value T0It is compared, and will exhaust temperature
The duration t and time threshold t of degree0It is compared, and the exhaust protected mode of compressor is judged according to comparative result.
The exhaust protected mode includes limit frequency protected mode, frequency reducing protected mode and stoppage protection pattern.
The limit frequency protected mode is realized by adjusting the aperture of electric expansion valve.
The frequency reducing protected mode is realized by reducing compressor frequency.
The beneficial effect of technical solution of the present invention is：
The exhaust protection control method of air conditioner of the present invention is according to delivery temperature and the temperature duration to determine whether enabling
Exhaust protection；And when enabling exhaust protection, enable adjust electronic expansion valve opening to adjust first, if adjusting failure, open
Frequency reducing is protected；If still failing, stoppage protection is opened.So as to ensure the accuracy judged, system service efficiency and compression are improved
The service life of machine.
Brief description of the drawings
Fig. 1 is the flow chart of the exhaust protection control method of air conditioner of the present invention.
Fig. 2 is the detailed process of the exhaust protection control method of air conditioner of the present invention.
Fig. 3 is the schematic diagram of exhaust one embodiment of Protection control system of air conditioner of the present invention.
Embodiment
In order to make those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention and attached
Figure, is described in detail technical solution of the present invention.
The exhaust protection control method of air conditioner of the present invention according to delivery temperature and the temperature duration to determine whether
Enable exhaust protection；And when enabling exhaust protection, enable adjust electronic expansion valve opening to adjust first, if adjusting failure,
Open frequency reducing protection；If still failing, stoppage protection is opened.So as to ensure judge accuracy, improve system service efficiency and
The service life of compressor.
The exhaust Protection control system of air conditioner proposed by the present invention include an initial value setup module, a detection module with
An and control module.As shown in Figure 1 and Figure 2, the exhaust protection control method of air conditioner proposed by the present invention includes the following steps：
Step S10：Setup module sets delivery temperature threshold values T0With delivery temperature duration threshold values t0；
Wherein, the delivery temperature threshold values T0Including：Limit frequency temperature T1, frequency reducing temperature T2, stoppage protection temperature T3And can be extensive
Rewarming degree T4.I.e. rapid S10 includes：Limit frequency temperature T is set1, frequency reducing temperature T2, stoppage protection temperature T3And can recovery temperature
T4.Wherein stoppage protection temperature T3＞ frequency reducing temperature T2＞ limit frequency temperature T1＞ can recovery temperature T4, and T1-T45 DEG C of ＞.
Step S11：Detect the delivery temperature T of compressorExhaustAnd temperature duration t；
In step S11, delivery temperature T is detected by the temperature sensor of contracting press exhaust end in real timeExhaust。
Step S12：It will detect delivery temperature TExhaustWith the delivery temperature threshold value T0It is compared, and will exhaust temperature
The duration t of the degree and time threshold t0It is compared, and the exhaust protected mode of compressor is judged according to comparative result；
In the embodiment of the present invention, the exhaust protected mode has the electronic expansion valve opening pattern that adjusts, frequency reducing protected mode, shuts down
Protected mode.
Specifically, the electronic expansion valve opening pattern namely limits frequency pattern, and delivery temperature is in limit frequency in such a mode
Opened when between temperature and frequency reducing temperature, limitation press frequency is current frequency, while increases electric expansion valve step number.
The frequency redution mode is to be adjusted by reducing compressor frequency, can not reduce exhaust when by limiting frequency pattern
After to limit frequency temperature or when delivery temperature is directly risen to more than frequency reducing temperature, that is, frequency redution mode is enabled, by reducing press
Frequency is adjusted.
The stoppage protection pattern is the pattern to adjust by close compressor operating, when limit frequency pattern and frequency reducing mould
When two kinds of regulative modes of formula can not be still dropped to delivery temperature below limit frequency temperature, stoppage protection pattern, close compressor are opened
Operate to be adjusted.
In step S12, when compressor air-discharging end, temperature sensor detects TExhaust≥T4+ 5, and the duration is more than or equal to 5
During the second, then control system enters limit frequency protected mode, adjusts electronic expansion valve opening, electronic expansion valve opening K1=original aperture K
+ 5 steps, and limit compressor frequency and rise, when detecting delivery temperature TExhaust≤ can recovery temperature T4When, return to electronic valve original
Aperture K, otherwise, continues to adjust electronic expansion valve opening, when delivery temperature is less than T4When+5, de-preservation pattern.
When limit frequency mode tuning failure, and compressor air-discharging end temperature sensor detects T1≤TExhaust＜ T2, and continue when
Between when being more than or equal to 5 seconds, no matter which kind of pattern is system operation be in, adjusts electronic expansion valve opening=original aperture K+10 and walks,
When compressor air-discharging end, temperature sensor detects TExhaust≤T4, and keep this temperature then to adjust electric expansion valve more than 3 seconds
Former aperture K is returned to, simultaneity factor limit frequency rises, and maintains existing frequency to run.If adjusting electronic expansion valve opening=original
Aperture K+10 step failures, and if still meeting T after five minutes1≤TExhaust＜ T2, then according to T2≤TExhaust＜ T3Section requires to perform frequency reducing
Pattern, frequency reducing 5Hz, and detect that delivery temperature declines after keeping the frequency 2 minutes, 2 minutes, and decline by a big margin, then solve
Except protected mode.If delivery temperature continues to rise after 2 minutes, and T2≤TExhaust＜ T3, then into next step regulative mode.
When detecting T2≤TExhaust＜ T3, and the duration be more than 3 seconds when, no matter which kind of pattern is system operation be in, then is
Frequency 5Hz again drops in system at once, and keeps the frequency 2 minutes, after frequency reducing 2 minutes：
If a, still meet T2≤TExhaust＜ T3When, then 5 Hz of frequency reducing rate, maintain 2 minutes, be still T at this time2≤TExhaust＜ T3, then directly
Stoppage protection is connect, when detecting TExhaust＜ T2When, then system exits stoppage protection pattern, turns back on operation.
If b, T4≤TExhaust＜ T2When, then keep the frequency run 30 minutes, follow-up system again according to control logic energy
Power calculates frequency operation.
If c, TExhaust＜ T4When, maintain 3 minutes, system is run by the capacity calculation frequency of logic again.
System operation whenever, once continuous 3 seconds detect T3≤TExhaust, system directly enters stoppage protection mould
Formula, and show " exhaust high temperature protection ", until detecting TExhaust＜ T4Shi Fangke starting up, otherwise remain shut off protected mode.
In the embodiment of the present invention, under any of the above protected mode if current frequency is less than by capacity calculation output frequency
Exported by actual frequency.Before system starts, if fruit detects delivery temperature TExhaust≥T4Then system does not allow to start, TExhaustMust be small
In T4It can start.
As shown in figure 3, the exhaust Protection control system of air conditioner proposed by the present invention includes：One control module, connection control
The detection module and initial value setup module module of molding block；Wherein, the initial value setup module is used to set exhaust temperature
Bottom valve value T0With delivery temperature duration threshold values t0, wherein, the delivery temperature threshold values T0Specifically include：Limit frequency temperature T1, drop
Frequency temperature T2, stoppage protection temperature T3And can recovery temperature T4, and T3＞ T2＞ T1＞ T4, T1-T4＞ tIf, t hereIfTake 5
℃；The detection module is used for the delivery temperature T for detecting compressorExhaustAnd the time t of the constant temperature；The control module is used
In will detect delivery temperature TExhaustWith the delivery temperature threshold value T0Be compared, and by the duration t of delivery temperature with
Time threshold t0It is compared, and the exhaust protected mode of compressor is judged according to comparative result.The exhaust protected mode bag
Include electronic expansion valve opening pattern, frequency reducing protected mode and stoppage protection pattern.
Wherein, the electronic expansion valve opening pattern namely limits frequency pattern, and delivery temperature is in limit frequency temperature in such a mode
Opened when between degree and frequency reducing temperature, limitation press frequency is current frequency, while increases electric expansion valve step number.
The frequency redution mode is to be adjusted by reducing compressor frequency, can not reduce exhaust when by limiting frequency pattern
After to limit frequency temperature or when delivery temperature is directly risen to more than frequency reducing temperature, that is, frequency redution mode is enabled, by reducing press
Frequency is adjusted.
The stoppage protection pattern is the pattern to adjust by close compressor operating, when limit frequency pattern and frequency reducing mould
When two kinds of regulative modes of formula can not be still dropped to delivery temperature below limit frequency temperature, stoppage protection pattern, close compressor are opened
Operate to be adjusted.
In the embodiment of the present invention, the initial value setup module sets limit frequency temperature T1, frequency reducing temperature T2, stoppage protection temperature
Spend T3And can recovery temperature T4.Wherein stoppage protection temperature T3＞ frequency reducing temperature T2＞ limit frequency temperature T1＞ can recovery temperature
T4, and T1-T45 DEG C of ＞.The detection module detects delivery temperature T by the temperature sensor of contracting press exhaust endExhaust。
When compressor air-discharging end, temperature sensor detects TExhaust≥T 4 +5, and the duration be more than or equal to 5 seconds when, control
Module control enters limit frequency protected mode, adjusts electronic expansion valve opening, electronic expansion valve opening K1=original aperture K+5 steps, and
Limit compressor frequency to rise, when detecting delivery temperature TExhaust≤ can recovery temperature T4When, electronic valve original aperture K is returned to,
Otherwise, continue to adjust electronic expansion valve opening, when delivery temperature is less than T4When+5, de-preservation pattern.
When limit frequency mode tuning failure, and compressor air-discharging end temperature sensor detects T1≤TExhaust＜ T2, the duration
During more than or equal to 5 seconds, no matter which kind of pattern is system operation be in, and control module adjusts electronic expansion valve opening=original aperture K
+ 10 steps, when compressor air-discharging end, temperature sensor detects TExhaust≤T4, and keep this temperature then to adjust electronics more than 3 seconds
Expansion valve returns to former aperture K, and simultaneity factor limit frequency rises, and maintains existing frequency to run.If adjust electric expansion valve to open
Degree=original aperture K+10 step failure, and if still meeting T after five minutes1≤TExhaust＜ T2, then according to T2≤TExhaust＜ T3Section requires to hold
Row frequency redution mode, frequency reducing 5Hz, and detected after keeping the frequency 2 minutes, 2 minutes delivery temperature decline, and fall compared with
Greatly, then de-preservation pattern.If delivery temperature continues to rise after 2 minutes, and T2≤TExhaust＜ T3, then adjusting side in next step is entered
Formula.
When detecting T2≤TExhaust＜ T3, and the duration be more than 3 seconds when, no matter which kind of pattern is system operation be in, then is
Frequency 5Hz again drops in system at once, and keeps the frequency 2 minutes, after frequency reducing 2 minutes：
If a, still meet T2≤TExhaust＜ T3When, then 5 Hz of frequency reducing rate, maintain 2 minutes, be still T at this time2≤TExhaust＜ T3, then directly
Stoppage protection is connect, when detecting TExhaust＜ T2When, then system exits stoppage protection pattern, turns back on operation.
If b, T4≤TExhaust＜ T2When, then keep the frequency run 30 minutes, follow-up system again according to control logic energy
Power calculates frequency operation.
If c, TExhaust＜ T4When, maintain 3 minutes, system is run by the capacity calculation frequency of logic again.
System operation whenever, once continuous 3 seconds detect T3≤TExhaust, system directly enters stoppage protection mould
Formula, and show " exhaust high temperature protection ", until detecting TExhaust＜ T4Shi Fangke starting up, otherwise remain shut off protected mode.
The present invention is protected according to delivery temperature and the temperature duration to determine whether enabling exhaust, enables exhaust protection
When, enable adjust electronic expansion valve opening to adjust first, if adjusting failure, open frequency reducing protection；If still failing, open
Stoppage protection, so as to ensure the accuracy judged, improves system service efficiency and the service life of compressor.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention.
Claims (14)
1. the exhaust protection control method of a kind of air conditioner, it is characterised in that include the following steps：
Delivery temperature threshold values T is set0With delivery temperature duration threshold values t0；
Detect the delivery temperature T of compressorExhaustAnd temperature duration t；
It will detect delivery temperature TExhaustWith the delivery temperature threshold value T0It is compared, and the duration t by delivery temperature
With the time threshold t0It is compared, and the exhaust protected mode of compressor is judged according to comparative result.
2. exhaust protection control method according to claim 1, it is characterised in that the delivery temperature threshold values T0Including：Limit
Frequency temperature T1, frequency reducing temperature T2, stoppage protection temperature T3With can recovery temperature T4, and T3＞ T2＞ T1＞ T4, T1-T4＞ tIf℃。
3. exhaust protection control method according to claim 2, it is characterised in that the exhaust protected mode includes limit frequency
Protected mode, frequency reducing protected mode and stoppage protection pattern.
4. the exhaust protection control method according to Claims 2 or 3, it is characterised in that as compressor exhaust temperature TExhaust≥
T4+ 5, and when the duration is more than or equal to 5 seconds, into limit frequency protected mode, adjust the aperture of electric expansion valve.
5. exhaust protection control method according to claim 4, it is characterised in that the aperture of electric expansion valve is adjusted to K1=
Original aperture K+5 steps, and limit compressor frequency and rise；When detecting delivery temperature TExhaust≤T4When, return to electric expansion valve
Aperture originally.
6. the exhaust protection control method according to Claims 2 or 3, it is characterised in that detected compressor when continuous 3 seconds
Delivery temperature TExhaust≥T3When, stoppage protection pattern is directly entered, until detecting TExhaust＜ T4When, start can be started.
7. the exhaust protection control method according to Claims 2 or 3, it is characterised in that it is characterized in that, when compressor is arranged
Gas detects T2≤TExhaust＜ T3When, and the duration be 5 seconds when, into frequency reducing protected mode, frequency reducing rate 5Hz, and keep the frequency
Rate 2 seconds, if T afterwards2≤TExhaust＜ T3When, then judge：
If a, TExhaust＜ T4When, maintain 3 minutes, system is run by the capacity calculation frequency of logic again；
If b, T4≤TExhaust＜ T2When, then keep the frequency run 30 minutes, follow-up system again according to control logic ability meter
Calculate frequency operation；
If c, continuous 3 seconds detect TExhaust≥T3When, system is directly entered stoppage protection pattern, until detecting TExhaust＜ T4Shi Fang
Can starting up.
8. the exhaust protection control method according to Claims 2 or 3, it is characterised in that when compressor exhaust temperature senses
Device detects T1≤TExhaust＜ T2, and the duration be more than or equal to 5 seconds when, into limit frequency protected mode.
9. exhaust protection control method according to claim 8, it is characterised in that adjusting electronic expansion valve opening K=original
Aperture K+10 is walked, if detecting afterwardsT is vented≤T4, and this temperature is kept more than 3 seconds, then de-preservation pattern, electric expansion valve
Return to former aperture operation；If detect T1≤TExhaust＜ T2, and the duration be more than 5 seconds when, then into frequency reducing protected mode.
10. exhaust protection control method according to claim 9, it is characterised in that frequency reducing rate 5Hz, and keep the frequency 2
Second, if T afterwards2≤TExhaust＜ T3When, then judge：
If a, TExhaust＜ T4When, maintain 3 minutes, system is run by the capacity calculation frequency of logic again；
If b, T4≤TExhaust＜ T2When, then keep the frequency run 30 minutes, follow-up system again according to control logic ability meter
Calculate frequency operation；
If c, continuous 3 seconds detect TExhaust≥T3When, system is directly entered stoppage protection pattern, until detecting TExhaust＜ T4Shi Fang
Can starting up.
A kind of 11. exhaust Protection control system of air conditioner, it is characterised in that including：
Initial value setup module, for setting delivery temperature threshold values T0With delivery temperature duration threshold values t0, wherein, the row
Gas threshold temperature T0Specifically include：Limit frequency temperature T1, frequency reducing temperature T2, stoppage protection temperature T3And can recovery temperature T4, and T3
＞ T2＞ T1＞ T4, T1-T4＞ tIf℃；
Detection module, for detecting the delivery temperature T of compressorExhaustAnd the time t of the constant temperature；
Control module, for that will detect delivery temperature TExhaustWith the delivery temperature threshold value T0It is compared, and will exhaust temperature
The duration t and time threshold t of degree0It is compared, and the exhaust protected mode of compressor is judged according to comparative result.
12. exhaust Protection control system according to claim 11, it is characterised in that the exhaust protected mode includes limit
Frequency protected mode, frequency reducing protected mode and stoppage protection pattern.
13. the exhaust Protection control system of air conditioner according to claim 12, it is characterised in that the limit frequency protection mould
Formula is realized by adjusting the aperture of electric expansion valve.
14. the exhaust Protection control system of air conditioner as claimed in claim 12, it is characterised in that the frequency reducing protected mode
Realized by reducing compressor frequency.
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| CN201711134353.0A CN107940694A (en) | 2017-11-16 | 2017-11-16 | The exhaust protection control method and system of a kind of air conditioner |
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| CN201711134353.0A CN107940694A (en) | 2017-11-16 | 2017-11-16 | The exhaust protection control method and system of a kind of air conditioner |
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