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 bagInclude：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 temperatureWith 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 temperatureSpend 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 protectPattern, 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；WhenDetect 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 detectionTo 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, dropFrequency 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 meterCalculate frequency operation；
If c, continuous 3 seconds detect TExhaust≥T3When, system is directly entered stoppage protection pattern, until detecting TExhaust＜ T4Shi FangCan starting up.
Preferably, when compressor exhaust temperature sensor detects T1≤TExhaust＜ T2, and the duration was more than or equal to 5 secondsWhen, 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 thisTemperature is more than 3 seconds, then de-preservation pattern, electric expansion valve return to former aperture operation；If detect T1≤TExhaust＜ T2, andWhen 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 rowGas 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 temperatureThe 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 enablingExhaust protection；And when enabling exhaust protection, enable adjust electronic expansion valve opening to adjust first, if adjusting failure, openFrequency reducing is protected；If still failing, stoppage protection is opened.So as to ensure the accuracy judged, system service efficiency and compression are improvedThe service life of machine.
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 attachedFigure, 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 whetherEnable 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 andThe 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 withAn 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 extensiveRewarming degree T4.I.e. rapid S10 includes：Limit frequency temperature T is set1, frequency reducing temperature T2, stoppage protection temperature T3And can recovery temperatureT4.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 temperatureThe 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 downProtected mode.
Specifically, the electronic expansion valve opening pattern namely limits frequency pattern, and delivery temperature is in limit frequency in such a modeOpened 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 patternAfter 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 pressFrequency is adjusted.
The stoppage protection pattern is the pattern to adjust by close compressor operating, when limit frequency pattern and frequency reducing mouldWhen 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 openedOperate 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 5During 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 originalAperture 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 whenBetween 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 secondsFormer aperture K is returned to, simultaneity factor limit frequency rises, and maintains existing frequency to run.If adjusting electronic expansion valve opening=originalAperture K+10 step failures, and if still meeting T after five minutes1≤TExhaust＜ T2, then according to T2≤TExhaust＜ T3Section requires to perform frequency reducingPattern, frequency reducing 5Hz, and detect that delivery temperature declines after keeping the frequency 2 minutes, 2 minutes, and decline by a big margin, then solveExcept 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 isFrequency 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 directlyStoppage 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 energyPower 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 mouldFormula, 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 frequencyExported by actual frequency.Before system starts, if fruit detects delivery temperature TExhaust≥T4Then system does not allow to start, TExhaustMust be smallIn 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 controlThe detection module and initial value setup module module of molding block；Wherein, the initial value setup module is used to set exhaust temperatureBottom valve value T0With delivery temperature duration threshold values t0, wherein, the delivery temperature threshold values T0Specifically include：Limit frequency temperature T1, dropFrequency 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 usedIn will detect delivery temperature TExhaustWith the delivery temperature threshold value T0Be compared, and by the duration t of delivery temperature withTime threshold t0It is compared, and the exhaust protected mode of compressor is judged according to comparative result.The exhaust protected mode bagInclude 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 modeOpened 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 patternAfter 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 pressFrequency is adjusted.
The stoppage protection pattern is the pattern to adjust by close compressor operating, when limit frequency pattern and frequency reducing mouldWhen 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 openedOperate 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 temperatureSpend T3And can recovery temperature T4.Wherein stoppage protection temperature T3＞ frequency reducing temperature T2＞ limit frequency temperature T1＞ can recovery temperatureT4, 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≥T4+5, and the duration be more than or equal to 5 seconds when, controlModule control enters limit frequency protected mode, adjusts electronic expansion valve opening, electronic expansion valve opening K1=original aperture K+5 steps, andLimit 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 durationDuring 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 secondsExpansion valve returns to former aperture K, and simultaneity factor limit frequency rises, and maintains existing frequency to run.If adjust electric expansion valve to openDegree=original aperture K+10 step failure, and if still meeting T after five minutes1≤TExhaust＜ T2, then according to T2≤TExhaust＜ T3Section requires to holdRow frequency redution mode, frequency reducing 5Hz, and detected after keeping the frequency 2 minutes, 2 minutes delivery temperature decline, and fall compared withGreatly, then de-preservation pattern.If delivery temperature continues to rise after 2 minutes, and T2≤TExhaust＜ T3, then adjusting side in next step is enteredFormula.
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 isFrequency 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 directlyStoppage 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 energyPower 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 mouldFormula, 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 protectionWhen, enable adjust electronic expansion valve opening to adjust first, if adjusting failure, open frequency reducing protection；If still failing, openStoppage 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 andWithin principle, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention.