CN103869847B - The position formula compressor cooling constant-temperature control method of a kind of multivariable control - Google Patents
The position formula compressor cooling constant-temperature control method of a kind of multivariable control Download PDFInfo
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- CN103869847B CN103869847B CN201410051862.7A CN201410051862A CN103869847B CN 103869847 B CN103869847 B CN 103869847B CN 201410051862 A CN201410051862 A CN 201410051862A CN 103869847 B CN103869847 B CN 103869847B
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Abstract
The present invention relates to the position formula compressor cooling constant-temperature control method of a kind of multivariable control, compressor is closed down a temperature deviation to be increased a compressor and runs continuously and carry out time effects additional components, makes additional components increase along with the increase of the time of carrying out; Compressor being closed down a temperature deviation and increases an ambient temperature effect additional content, this additional content is the temperature difference of desired temperature and envrionment temperature, and is directly proportional to control object internal-external temperature difference; The time delay protection time, when control object temperature deviation rises to compressor start point, compressor started immediately to the standby period later; In the continuous operation period after compressor start, the office by compression that only closes down of compressor stops point control, namely when control object temperature deviation be down to close down some time, or close down a little automatically on when rising to equal with control object temperature deviation, close down compressor immediately. The present invention can realize the exact constant temperature control of gamut.
Description
Technical field
The present invention relates to three-position type refrigerated constant temperature control techniques field, particularly relate to the position formula compressor cooling constant-temperature control method of a kind of multivariable control.
Background technology
Existing position formula refrigerated constant temperature control method is all the changing conditions by control object temperature deviation (i.e. the difference of observed value and set(ting)value, lower same), adopts the fixed three-position type control method of subsidiary compressor shutdown time delay protection function. Beyond the time delay protection time, it is all fixing that compressor start point (i.e. upper switching point temperature deviation) and compressor close down point (i.e. lower switching point temperature deviation). Its shortcoming is: when reference mark (i.e. design temperature, lower with) close to self-balance of heat time, due to thermal inertia effect, make compressor every time continuously the on time too long, temperature undershoot is severe; When reference mark is far below envrionment temperature, the quickening due to heat-up rate after compressor shutdown and the restriction by the time delay protection time, temperature upper punch is bigger. Therefore cannot taking into account above-mentioned two kinds of operating modes in gamut, temperature fluctuation degree and reference mark error are all bigger, cannot realize being better than �� accurate the temperature control of 0.5 DEG C of fluctuation degree.
Summary of the invention
Technical problem to be solved by this invention is to provide the position formula compressor cooling constant-temperature control method of a kind of multivariable control, overcomes various factors to the impact of control performance, to improve control accuracy.
The technical solution adopted for the present invention to solve the technical problems is: the position formula compressor cooling constant-temperature control method providing a kind of multivariable control, introduce carrying out time and envrionment temperature two independent variable(s) participation adjustments that compressor runs every time continuously, compressor is closed down a temperature deviation increase a compressor and run continuously and carry out time effects additional components, make this additional components increase along with the increase of the time of carrying out; Compressor being closed down a temperature deviation and increases an ambient temperature effect additional content, this additional content is the temperature difference of desired temperature and envrionment temperature, and is directly proportional to control object internal-external temperature difference; Time delay protection the time terminate after the standby period, when control object temperature deviation rises to compressor start point, compressor starts immediately; In the continuous operation period after compressor start, the office by compression that only closes down of compressor stops point control, namely when control object temperature deviation be down to close down some time, or close down a little automatically on when rising to equal with control object temperature deviation, close down compressor immediately.
Compressor closes down a temperature deviation: �� ��g=�� ��go+V����b+K(��s-��E), wherein, �� ��goFor setting compressor close down a base temperature deviation,��For carrying out time of running continuously after compressor start, V be close down the speed that a little rises at any time after compressor start, compressor that b is preset continue top limit, the �� that operation carries out time effects component every timesFor desired temperature, ��EFor envrionment temperature, K are the ambient temperature effect coefficient set.
Compressor start point temperature deviation: �� ��q=a, wherein, a is the preset compressor start point concrete numerical value of temperature deviation.
Reference mark is in the control near hot self-balance point: enter time delay protective time slot, time delay is protected a little, after entering the standby period, owing to reference mark is near hot self-balance point, therefore object temperature deviation lift velocity is extremely slow, object temperature deviation rises to start-up point, start compressor immediately and enter and run the period continuously, meanwhile compressor is closed down a temperature deviation and is also closed down from preset compressor immediately and increase with preset rising rate linear at any time a base temperature deviation basis, and when the 3rd time point and object temperature deviation meet, close down compressor immediately.
Reference mark lower than envrionment temperature many time control: experience time delay protection and standby startup after; it is quite low that compressor closes down a starting point of temperature deviation; add the maximum value carrying out time effects component that the compressor closed down a little runs every time continuously to be limited; final compressor closes down a temperature deviation, and to close down a base temperature deviation than preset compressor much lower; until just closing down compressor when object temperature deviation is down to bigger negative deviation during the 4th time point; making the positive and negative half period of object temperature deviation substantially symmetrical, namely reference mark error is close to zero.
Useful effect
Owing to have employed above-mentioned technical scheme, the present invention compared with prior art, has following advantage and positively effect:
The present invention controls in link at existing position formula refrigerated constant temperature, and introducing compressor runs continuously every time and carries out two independent variable(s) participation adjustments such as time and envrionment temperature, by the accumulation of experiment repeatedly, theoretical analysis and experience, sets up the mathematical model of controller. After correction, the performance of position formula refrigerated constant temperature control is improved greatly, it may be achieved the control of the exact constant temperature of gamut, thus realizes being better than �� accurate the temperature control of 0.5 DEG C of fluctuation degree.
The present invention both can independently as the control method of position formula refrigerated constant temperature controller, also can be used as the control method in position formula refrigerated constant temperature control link in cold and hot thermostatic control system, it is applied in the aspects such as temperature controller, illumination box, climatic chamber, incubator, growth cabinet.
Accompanying drawing explanation
Fig. 1 is the control principle schematic that embodiment is in control point near the control object self-balance point of heat;
Fig. 2 is the control principle schematic that embodiment is in the inside and outside big temperature difference control point of control object.
Embodiment
Below in conjunction with specific embodiment, set forth the present invention further. Limit the scope of the invention it will be understood that these embodiments are only not used in for illustration of the present invention. In addition it will be understood that after having read the content that the present invention lectures, the present invention can be made various changes or modifications by those skilled in the art, and these equivalent form of values fall within the application's appended claims limited range equally.
Embodiments of the present invention relate to the position formula compressor cooling constant-temperature control method of a kind of multivariable control, introduce carrying out time and envrionment temperature two independent variable(s) participation adjustments that compressor runs every time continuously, compressor is closed down a temperature deviation increase a compressor and run continuously and carry out time effects additional components, make additional components increase along with the increase of the time of carrying out, thus can effectively prevent the phenomenon of temperature undershoot near hot self-balance point; Compressor is closed down a temperature deviation and increases an ambient temperature effect additional content, this additional content and desired temperature are directly proportional to the temperature difference of envrionment temperature, therefore under same desired temperature, envrionment temperature is more high, above-mentioned close down a little more low, thus effectively overcome working point far below temperature upper punch phenomenon during envrionment temperature. The time delay protection time, when control object temperature deviation rises to compressor start point, compressor started immediately to the standby period later; In the continuous operation period after compressor start, the office by compression that only closes down of compressor stops point control, namely when control object temperature deviation be down to close down some time, or close down a little automatically on when rising to equal with control object temperature deviation, close down compressor immediately.
Interval refrigeration is divided into three periods power on after or compressor close down after time delay protective time slot, the same with routine inaccurate within this time limit start compressor; Time delay protects the time to the standby period later, as control object temperature deviation delta �� (i.e. observed value ��PWith set(ting)value ��sDifference) when rising to compressor start point, compressor starts immediately; In the continuous operation period after compressor start, the office by compression that only closes down of compressor stops point control, namely when control object temperature deviation delta �� be down to close down some time, or close down a little automatically on rise to equal with control object temperature deviation delta �� time, close down compressor immediately. Concrete start-up point and to close down expression a little as follows:
Compressor start point temperature deviation: �� ��q=a, wherein, a is the preset compressor start point concrete numerical value of temperature deviation, DEG C.
Compressor closes down a temperature deviation: �� ��g=�� ��go+V����b+K(��s-��E), wherein, �� ��goFor preset compressor closes down a base temperature deviation, DEG C, �� be the carrying out time run continuously after compressor start, s, V close down, after preset compressor start, the speed that a little rises at any time, DEG C/s, b be that preset compressor continues the top limit run and carry out time effects component every time, DEG C, ��sFor desired temperature, DEG C, ��EFor envrionment temperature, DEG C, K be setting ambient temperature effect coefficient.
Reference mark is in the control of the reference mark near hot self-balance some principle as shown in Figure 1, and now compressor closes down a temperature deviation delta ��gOnly close down a base temperature deviation delta �� by preset compressorgo, close down the some V of rising speed at any time and compressor start after preset compressor start after the �� product composition of carrying out time that runs continuously. After Controlling System is opened, entered time delay protective time slot before this, very first time point t1It is that time delay is protected a little, enters the standby period. Owing to being near hot self-balance point, therefore object temperature deviation delta �� lift velocity is extremely slow, the 2nd time point t2Being that object temperature difference �� rises to start-up point, now start compressor immediately and enter and run the period continuously, meanwhile compressor is closed down a temperature deviation and is closed down a base temperature deviation delta �� from preset compressor immediatelygoAt any time with preset rising speed V linear increase on basis, and in the 3rd time point t3Time and object temperature deviation meet (order), so closing down compressor immediately. Obviously, if by existing position formula refrigeration control method, it is necessary to make object temperature deviation delta �� be down to preset compressor and close down a base temperature deviation delta ��goShi Caihui closes down compressor, the object temperature deviation delta �� such as the present embodiment does not then also have to decline, even also just turn off compressor when heating up, so each continuous operating time of compressor can significantly shorten, thus lower momentum is declined to a great extent, temperature fluctuation degree is corresponding much slower also. Now illustrate: establish �� ��q=0.2 DEG C, �� ��go=0.1 DEG C, V=0.45 DEG C/min, establishing again reference mark near the self-balance point of heat, standby later stage object heat-up rate is 0.05 DEG C/minute. Then can solve: running the time of carrying out continuously after compressor start is 15 seconds. Just closing down compressor according to existing position formula refrigerating method when then �� �� is down to 0.1 DEG C, their run at least more than 30 seconds every time continuously, and the refrigerating duty of generation will how several times like this, and significantly undershoot is inevitable for temperature.
Fig. 2 be reference mark lower than envrionment temperature many time control principle drawing. This operating mode just refers to that high temperature season does the operating mode of low-temperature test, and now compressor closes down a temperature deviation delta ��gSection 3 be the negative temperature difference that an absolute value is relatively very big, compressor time standby like this and when compressor just starts closes down a temperature deviation delta ��gA base temperature deviation delta �� is closed down than preset compressorgoMuch lower. Therefore after experience time delay protection and standby startup; it is very low that compressor closes down a starting point of temperature deviation; adding the compressor closed down a little to run the maximum value carrying out time effects component every time continuously and be limited in b (being such as limited in less than 0.2 DEG C), therefore final compressor closes down a temperature deviation delta ��gA base temperature deviation delta �� is closed down than preset compressorgoMuch lower, until just closing down compressor when object temperature deviation delta �� is down to bigger negative deviation during the 4th time point t4, thus the positive and negative half period making object temperature difference �� is substantially symmetrical, and namely reference mark error is close to zero. And according to existing position formula refrigerated constant temperature control method; then close down compressor too early when the 4th time point t4; subsequently owing to object internal-external temperature difference is big; after shutdown soon temperature with regard to rapid increase; the time delay protection time does not also terminate, and object temperature deviation just exceedes start-up point temperature deviation already, when restarting compressor after waiting the time delay protection time to terminate; object temperature deviation is away from reference mark, thus causes bigger reference mark error. Now illustrate: establish �� ��q=0.2 DEG C, �� ��go=0.1 DEG C, V=0.45 DEG C/min, b DEG C=0.2 DEG C, K=0.020, ��S=5 DEG C, ��E=35 DEG C, then can solve: a temperature deviation of closing down for compressor is-0.3 DEG C. So, when adopting of the present invention in this example, compressor during this operating mode is closed down and is a little moved 0.4 DEG C than closing down of existing position formula refrigerated constant temperature control under a little, by having moved 0.4 DEG C under temperature averages, thus corrects reference mark error.
Being not difficult to find, the control performance of the position formula refrigerated constant temperature control of the multivariable control after above-mentioned improvement obtains and greatly improves, it may be achieved the exact constant temperature control of gamut, it is achieved that be better than �� the precise hard_drawn tuhes of more than 0.5 DEG C.
Claims (5)
1. the position formula compressor cooling constant-temperature control method of a multivariable control, it is characterized in that, introduce carrying out time and envrionment temperature two independent variable(s) participation adjustments that compressor runs every time continuously, compressor is closed down a temperature deviation increase a compressor and run continuously and carry out time effects additional components, make this additional components increase along with the increase of the time of carrying out; Compressor being closed down a temperature deviation and increases an ambient temperature effect additional content, this additional content and desired temperature are directly proportional to the temperature difference of envrionment temperature; Time delay protection the time terminate after the standby period, when control object temperature deviation rises to compressor start point, compressor starts immediately; In the continuous operation period after compressor start, the office by compression that only closes down of compressor stops point control, namely when control object temperature deviation be down to close down some time, or close down a little automatically on when rising to equal with control object temperature deviation, close down compressor immediately.
2. the position formula compressor cooling constant-temperature control method of multivariable control according to claim 1, it is characterised in that, compressor closes down a temperature deviation: �� ��g=�� ��go+V����b+K(��s-��E), wherein, �� ��goFor the compressor of setting close down a base temperature deviation, �� is carrying out time of running continuously after compressor start, V be close down the speed that a little rises at any time after compressor start, compressor that b is preset continue top limit, the �� that operation carries out time effects component every timesFor desired temperature, ��EFor envrionment temperature, K are the ambient temperature effect coefficient set.
3. the position formula compressor cooling constant-temperature control method of multivariable control according to claim 1, it is characterised in that, compressor start point temperature deviation: �� ��q=a, wherein, a is the preset compressor start point concrete numerical value of temperature deviation.
4. the position formula compressor cooling constant-temperature control method of multivariable control according to claim 1, it is characterized in that, reference mark is in the control near hot self-balance point: enter time delay protective time slot, time delay is protected a little, after entering the standby period, owing to reference mark is near hot self-balance point, therefore object temperature deviation lift velocity is extremely slow, object temperature deviation rises to start-up point, start compressor immediately and enter and run the period continuously, meanwhile compressor is closed down a temperature deviation and is also closed down from preset compressor immediately and increase with preset rising rate linear at any time a base temperature deviation basis, and when the 3rd time point and object temperature deviation meet, close down compressor immediately.
5. the position formula compressor cooling constant-temperature control method of multivariable control according to claim 1, it is characterized in that, reference mark lower than envrionment temperature many time control: experience time delay protection and standby startup after, it is very low that compressor closes down a starting point of temperature deviation, add the maximum value carrying out time effects component that the compressor closed down a little runs every time continuously to be limited, final compressor closes down a temperature deviation, and to close down a base temperature deviation than preset compressor much lower, until the object temperature difference is down to bigger negative deviation during the 4th time point, time just close down compressor, make the positive and negative half period of the object temperature difference substantially symmetrical, namely reference mark error is close to zero.
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| CN104948437B (en) * | 2015-07-03 | 2016-03-30 | 广州市庆瑞电子科技有限公司 | A kind of compressor control method |
| CN110410996B (en) * | 2019-07-19 | 2022-09-30 | 宁波东邦电器有限公司 | Compressor dehumidification position type constant humidity control method taking humidity valley value as adjusted parameter |
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| CN1758001A (en) * | 2004-10-09 | 2006-04-12 | 河南新飞电器有限公司 | Temperature control method of refrigerator |
| CN1926389A (en) * | 2004-03-04 | 2007-03-07 | 开利公司 | Multi-variable control of refrigerant systems |
| US7464748B2 (en) * | 2003-12-05 | 2008-12-16 | Hyundai Motor Company | Intercooler system and intake air cooling method |
| CN101408775A (en) * | 2007-10-12 | 2009-04-15 | 苏州三星电子有限公司 | Refrigerator temperature control method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7464748B2 (en) * | 2003-12-05 | 2008-12-16 | Hyundai Motor Company | Intercooler system and intake air cooling method |
| CN1926389A (en) * | 2004-03-04 | 2007-03-07 | 开利公司 | Multi-variable control of refrigerant systems |
| CN1758001A (en) * | 2004-10-09 | 2006-04-12 | 河南新飞电器有限公司 | Temperature control method of refrigerator |
| CN101408775A (en) * | 2007-10-12 | 2009-04-15 | 苏州三星电子有限公司 | Refrigerator temperature control method |
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