CN112648794A - Rapid and accurate temperature control method for medical refrigerator and medical refrigerator - Google Patents
Rapid and accurate temperature control method for medical refrigerator and medical refrigerator Download PDFInfo
- Publication number
- CN112648794A CN112648794A CN202011580029.3A CN202011580029A CN112648794A CN 112648794 A CN112648794 A CN 112648794A CN 202011580029 A CN202011580029 A CN 202011580029A CN 112648794 A CN112648794 A CN 112648794A
- Authority
- CN
- China
- Prior art keywords
- temperature
- control
- calculating
- medical
- proportionality coefficient
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
Abstract
The invention discloses a rapid and accurate temperature control method for a medical refrigerating box and the medical refrigerating box, and the method comprises the following steps: acquiring the actual temperature in the medical refrigerating box, and calculating the temperature difference between the preset target temperature in the box and the actual temperature in the box; if the temperature difference is larger than the condition threshold value delta M, calculating the proportionality coefficient K according to the environment temperature C of the environment where the medical refrigerating box is locatedP(C) Controlling by utilizing P to obtain the working frequency F of the variable frequency compressor; otherwise, calculating a proportionality coefficient K according to a preset in-box target temperature SP(S) and an integral coefficient KIAnd (S) utilizing PI control to obtain the working frequency F of the variable frequency compressor, and controlling the rotating speed of the variable frequency compressor according to the working frequency F to realize primary temperature control of the medical refrigerating box. The rapid and accurate temperature control method of the medical refrigerating box and the medical refrigerating box realize rapid and accurate temperature control.
Description
Technical Field
The application belongs to the technical field of medical refrigeration, and particularly relates to a quick and accurate temperature control method for a medical refrigerator and the medical refrigerator.
Background
With the rapid development of the medical refrigeration industry, at present, medical equipment is increasingly demanded by large medical places, research units and disease control centers, and higher requirements are put forward on the performance of the medical equipment. Some special articles such as sensitive medicines, vaccines, blood and the like have quite high requirements on the control precision and stability of the refrigeration temperature in the transportation and storage processes, and cannot exert the original effect even can cause failure when the refrigeration temperature is exceeded; such as: the vaccine must be preserved in the dark at the temperature of 2-8 ℃; whole blood and red blood cells must be stored within 4 ± 2 ℃ in order to allow the activity of enzymes in blood to be relatively low and prevent the enzymes from destroying blood components.
The control of the internal temperature uniformity and fluctuation of medical equipment on the market is not ideal at present. The temperature control schemes in the market at present are mainly divided into two types: one is to set a certain temperature difference according to a target temperature set by a user and carry out simple on-off control according to the temperature difference; and the other method adopts the traditional PID control method to control the temperature. However, the former cannot meet the requirement of accurate temperature control, and the latter has a large error with the target temperature and low control accuracy when the environmental temperature is changed in a complex manner, cannot perform adaptive adjustment according to the environmental temperature, and has poor adaptability.
In the prior art, for example, a patent with publication number CN109654790A discloses an accurate temperature control method for a medical refrigerator, which can transmit the temperature value detected in a temperature control system to a wireless local area network in real time to be connected with a mobile terminal, so that a user can monitor and adjust the temperature at any time, and then a temperature judger compares the detected temperature, and when an abnormality occurs, an alarm is given, and informs a temperature sensor to detect again, so as to detect and control the temperature in real time. However, the temperature control strategy of the technical scheme adopts simple on-off control, cannot achieve accurate temperature control, and is not suitable for the requirement of accurate temperature control of the medical refrigerator.
Disclosure of Invention
The application aims to provide a quick and accurate temperature control method for a medical refrigerating box and the medical refrigerating box, and the quick and accurate temperature control is realized.
In order to achieve the purpose, the technical scheme adopted by the application is as follows:
a quick and accurate temperature control method for a medical refrigerating box is used for controlling the rotating speed of a variable frequency compressor in the medical refrigerating box to realize temperature control, and comprises the following steps:
step 1, acquiring the actual temperature in a medical refrigerating box, and calculating the temperature difference between a preset target temperature in the box and the actual temperature in the box;
step 4, calculating a proportionality coefficient K according to a preset in-box target temperature SP(S) and an integral coefficient KI(S), the working frequency F of the inverter compressor is obtained by utilizing PI control, and the method comprises the following steps:
step 4.1, calculating the proportionality coefficient KP(S) and an integral coefficient KI(S) the following:
KP(S)＝A1S+b1
KI(S)＝A2S+b2
in the formula, A1、A2Is a coefficient of a first order term, b1、b2Is constant and 0<A1<1，0<A2<2，1<b1<5，5<b2<20；
And 4.2, calculating the output quantity of PI control as follows:
wherein e (t) is the input for PI control, i.e. the temperature difference, u (t)SIs the output quantity of PI control;
and 4.3, calculating the working frequency F of the variable frequency compressor according to the output quantity of the PI control as follows:
F＝DS×u(t)S
in the formula, DSIs a conversion coefficient under PI control;
and 5, controlling the rotating speed of the variable frequency compressor according to the working frequency F to realize primary temperature control of the medical refrigerating box.
Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.
Preferably, the proportional coefficient K is calculated according to the environmental temperature C of the environment where the medical refrigerating box is locatedP(C) And the working frequency F of the variable frequency compressor is obtained by utilizing P control, and the method comprises the following steps:
step 3.1, calculating a proportionality coefficient K according to the ambient temperature CP(C) The following were used:
if C is less than or equal to T1, the proportionality coefficient KP(C) Get KP1(ii) a If T1<C is less than or equal to T2, the proportionality coefficient KP(C) Get KP2(ii) a If T2<C is less than or equal to T3, the proportionality coefficient KP(C) Get KP3(ii) a If T3<C is less than or equal to T4, the proportionality coefficient KP(C) Get KP4(ii) a If C>T4, the proportionality coefficient KP(C) Get KP5(ii) a And KP5>KP4>KP3>KP2>KP1；
And 3.2, calculating the output quantity of P control as follows:
u(t)C＝KP(C)e(t)
in the formula, u (t)CAn output quantity controlled by P;
and 3.3, calculating the working frequency F of the variable frequency compressor according to the output quantity controlled by the P as follows:
F＝DC×u(t)C
in the formula, DCIs the conversion coefficient under control of P.
Preferably, K isP1>0 and KP5<10。
The application still provides a medical fridge, medical fridge is including the frequency conversion compressor who is used for exporting cold volume, installs the inside temperature sensor at medical fridge's incasement, installs the ring temperature sensor outside medical fridge's incasement to and the microcontroller of being connected with inside temperature sensor, ring temperature sensor and frequency conversion compressor, microcontroller includes memory and treater, the memory storage has computer program, the treater is executed computer program realizes following step:
step 1, receiving the actual temperature in the medical refrigerating box fed back by the internal temperature sensor, and calculating the temperature difference between the preset target temperature in the medical refrigerating box and the actual temperature in the medical refrigerating box;
step 4, calculating a proportionality coefficient K according to a preset in-box target temperature SP(S) and an integral coefficient KI(S), the working frequency F of the inverter compressor is obtained by utilizing PI control, and the method comprises the following steps:
step 4.1, calculating the proportionality coefficient KP(S) and an integral coefficient KI(S) the following:
KP(S)＝A1S+b1
KI(S)＝A2S+b2
in the formula, A1、A2Is a coefficient of a first order term, b1、b2Is constant and 0<A1<1，0<A2<2，1<b1<5，5<b2<20；
And 4.2, calculating the output quantity of PI control as follows:
wherein e (t) is the input for PI control, i.e. the temperature difference, u (t)SIs the output quantity of PI control;
and 4.3, calculating the working frequency F of the variable frequency compressor according to the output quantity of the PI control as follows:
F＝DS×u(t)S
in the formula, DSIs a conversion coefficient under PI control;
and 5, controlling the rotating speed of the variable frequency compressor according to the working frequency F to realize primary temperature control of the medical refrigerating box.
Preferably, the proportional coefficient K is calculated according to the environmental temperature C of the environment where the medical refrigerating box is locatedP(C) And obtaining the working frequency F of the inverter compressor by utilizing P control, and executing the following operations:
step 3.1, calculating a proportionality coefficient K according to the ambient temperature CP(C) The following were used:
if C is less than or equal to T1, the proportionality coefficient KP(C) Get KP1(ii) a If T1<C is less than or equal to T2, the proportionality coefficient KP(C) Get KP2(ii) a If T2<C is less than or equal to T3, the proportionality coefficient KP(c) Get KP3(ii) a If T3<C is less than or equal to T4, the proportionality coefficient KP(C) Get KP4(ii) a If C>T4, the proportionality coefficient KP(C) Get KP5(ii) a And KP5>KP4>KP3>KP2>KP1；
And 3.2, calculating the output quantity of P control as follows:
u(t)C＝KP(C)e(t)
in the formula, u (t)CAn output quantity controlled by P;
and 3.3, calculating the working frequency F of the variable frequency compressor according to the output quantity controlled by the P as follows:
F＝DC×u(t)C
in the formula, DCIs the conversion coefficient under control of P.
Preferably, K isP1>0 and KP5<10。
According to the rapid and accurate temperature control method for the medical refrigerating box and the medical refrigerating box, the actual temperature in the box of the medical refrigerating box is obtained, the temperature difference between the target temperature in the box and the actual temperature in the box is calculated, when the temperature difference is higher than a condition threshold value, a reasonable proportion coefficient is self-adapted according to the environment temperature, proportion control is conducted, and the error of a using system quickly reaches the threshold value.
According to the balance relation, when the target temperature is lower, the control quantity output under the larger steady state is needed to offset the larger cold loss, and the larger integral coefficient is used to reduce the demand quantity of the integral value, which is equal to the reduction of the adjusting time. In addition, when the target temperature is low, the effect of the proportional component can be increased by using a large proportional coefficient, so that the response speed is increased, and the adjusting time is shortened. Therefore, when the temperature difference is lower than the condition threshold, the proportional coefficient and the integral coefficient are calculated according to the linear function of the target temperature and the reasonable constant, and the aim of quickly and accurately controlling the temperature is fulfilled.
Especially under different ambient temperature, the fridge leads to cold-stored temperature sudden change because under the circumstances such as opening the door, door crack leak cold, the temperature control method of this application can self-adaptation, quick response temperature sudden change, avoids leading to the medicine inefficacy.
Drawings
FIG. 1 is a flow chart illustrating a method for rapidly and precisely controlling temperature of a medical cooler of the present application;
FIG. 2 is a schematic illustration of a medical cooler of the present application;
FIG. 3 is another schematic illustration of the medical cooler of the present application;
fig. 4 is a graph showing the test results of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
The environmental temperature is usually a nonlinear, time-lag and time-varying complex system, although the traditional PID control method has low cost and simple control mode, the parameters of the traditional PID control method are fixed and unchanged, when the complex system is encountered, the error with the target temperature is usually large, the control precision is also low, the rapid and self-adaptive adjustment cannot be carried out according to the environmental temperature, and the environmental adaptability is poor.
Therefore, the application provides a rapid and accurate temperature control method for a medical refrigerating box, which is used for controlling the rotating speed of a variable-frequency compressor in the medical refrigerating box to realize temperature control, and compared with the traditional PID control and the simple fuzzy PID control, the method has the advantages of smaller overshoot, quicker response speed and smaller steady-state error, can effectively adapt to the characteristics of nonlinearity, time lag and time variability of the ambient temperature, and realizes an accurate temperature control effect.
As shown in fig. 1, the method for rapidly and accurately controlling the temperature of the medical refrigerating container of the present embodiment comprises:
step 1, acquiring the actual temperature in the medical refrigerating box, and calculating the temperature difference between the preset target temperature in the box and the actual temperature in the box.
When the actual temperature in the box is obtained, the actual temperature is obtained based on a temperature sensor or a temperature and humidity sensor, and the type of the sensor is not limited. The sensors may be installed at any position or designated position in the medical refrigerator, and may acquire the temperature based on a single sensor, or may determine the final temperature by using a weighting method, an average value method, a median value method, etc. by comprehensively using the temperature values acquired by a plurality of sensors.
The present embodiment selectively performs the P control or the PI control according to the temperature difference. When the difference from the target temperature is large, the reasonable proportional coefficient is self-adapted according to the ambient temperature, proportional control (P control) is carried out, the cold loss of the refrigerating box caused by the cold dissipation problem is made up, the temperature drop can be self-adapted and quickly responded, and the drug failure is avoided. When the difference between the target temperature and the internal temperature is small, the internal temperature of the medical refrigerating box is accurately adjusted based on PI control, and the phenomena of vibration and the like are reduced.
The condition threshold Δ M is determined by the volume of the medical refrigerator, the refrigerating efficiency of the compressor, the refrigerating performance of the foam layer of the medical refrigerator, the door sealing performance of the refrigerator, and the like, and may be, for example, 1.5 times the target temperature in the refrigerator.
Step 3.1, calculating a proportionality coefficient K according to the ambient temperature CP(C) The following were used:
if C is less than or equal to T1, the proportionality coefficient KP(C) Get KP1(ii) a If T1<C is less than or equal to T2, the proportionality coefficient KP(C) Get KP2(ii) a If T2<C is less than or equal to T3, the proportionality coefficient KP(C) Get KP3(ii) a If T3<C is less than or equal to T4, the proportionality coefficient KP(C) Get KP4(ii) a If C>T4, the proportionality coefficient KP(C) Get KP5(ii) a And KP5>KP4>KP3>KP2>KP1。
And 3.2, calculating the output quantity of P control as follows:
u(t)C＝KP(C)e(t)
in the formula, u (t)CThe output quantity is controlled by P.
And 3.3, calculating the working frequency F of the variable frequency compressor according to the output quantity controlled by the P as follows:
F＝DC×u(t)C
in the formula, DCIs the conversion coefficient under control of P.
Because the ambient temperature also has certain influence to the accuse temperature of medical fridge, consequently this embodiment is according to ambient temperature adjustment proportionality coefficient when carrying out P control, has overcome among the prior art and has only looked at the incasement target temperature and adjust the time easily because of operations such as switch lead to adjusting untimely scheduling problem. Wherein
When the proportion is adjusted, the higher the environment temperature is, the larger the proportion coefficient is, the response speed is convenient to accelerate, and the adjusting time is shortened. K for adapting to different values of different medical refrigeratorsP1To KP5The value of (A) depends on the factors of the cold insulation performance of a foaming layer of the refrigerator, the door seal performance of the refrigerator and the like, and the general value range is KP1>0 and KP5<10。
It should be noted that, in the above method for adjusting the scaling factor according to the environmental temperature, in other embodiments, an adjustment may be performed based on the present embodiment, for example, the number of segments is reduced or increased.
Step 4, calculating a proportionality coefficient K according to a preset in-box target temperature SP(S) and an integral coefficient KI(S), the working frequency F of the inverter compressor is obtained by utilizing PI control, and the method comprises the following steps:
step 4.1, calculating the proportionality coefficient KP(S) and an integral coefficient KI(S) the following:
KP(S)＝A1S+b1
KI(S)＝A2S+b2
in the formula, A1、A2Is a coefficient of a first order term, b1、b2Is constant and 0<A1<1，0<A2<2，1<b1<5，5<b2<20. In addition, A is1、A2、b1、b2The value of (a) depends on the factor to be the cold insulation performance of the foaming layer of the refrigerating box, the door seal performance of the refrigerating box and the like, the value-taking mode provided by the embodiment has strong adaptability and good adjusting effect, and the value-taking mode can be adjusted according to the actual refrigerating temperature control requirement in other embodiments.
This application is based on linear function adjustment proportionality coefficient and integral coefficient of target temperature, and when target temperature was lower, the great cold loss was offset in the controlled quantity output under the great steady state of needs among the cooling control, uses great integral coefficient can reduce the demand to the integral value this moment, equals to reduce the adjust time. In addition, when the target temperature is low, the effect of the proportional component can be increased by using a large proportional coefficient, so that the response speed is increased, and the adjusting time is shortened.
And 4.2, calculating the output quantity of PI control as follows:
wherein e (t) is the input for PI control, i.e. the temperature difference, u (t)SIs the output of PI control.
And 4.3, calculating the working frequency F of the variable frequency compressor according to the output quantity of the PI control as follows:
F＝DS×u(t)S
in the formula, DSIs the conversion coefficient under PI control. Conversion coefficient D in the present embodimentC、DSMay be the same or may take different values and depend on the performance of the inverter compressor, e.g. the conversion factor DC、DSAll take 2.
And 5, controlling the rotating speed of the variable frequency compressor according to the working frequency F to realize primary temperature control of the medical refrigerating box. The step 1 to the step 5 are one time of temperature control in the temperature control of the medical refrigerator, and the continuous temperature control of the medical refrigerator can be realized by repeatedly executing the step 1 to the step 5.
The rotating speed of the variable frequency compressor is controlled by changing the working frequency of the variable frequency compressor, and the higher the rotating speed is, the higher the output power of the variable frequency compressor is, the more the corresponding output cold quantity is; the lower the rotating speed is, the smaller the output power of the variable frequency compressor is, and the corresponding output cold quantity is less.
The conversion relation among the working frequency, the rotating speed and the output power of the inverter compressor is not taken as the focus of the discussion of the application, and the relation among the three is related to the performance of the inverter compressor, for example, the rotating speed n can be 30 times of the working frequency.
In another embodiment, as shown in fig. 2, there is provided a medical refrigerator, the medical refrigerator of this embodiment comprising an inverter compressor for outputting cooling capacity, an internal temperature sensor installed inside a case of the medical refrigerator, an ambient temperature sensor installed outside the case of the medical refrigerator, and a Microcontroller (MCU) connected to the internal temperature sensor, the ambient temperature sensor, and the inverter compressor. The frequency conversion compressor can be a frequency conversion controller and a compressor which are connected, namely a microcontroller controls the frequency conversion controller, and then the frequency conversion controller controls the compressor to work so as to realize the regulation of output cold quantity.
Wherein the microcontroller comprises a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of:
step 1, receiving the actual temperature in the medical refrigerating box fed back by the internal temperature sensor, and calculating the temperature difference between the preset target temperature in the medical refrigerating box and the actual temperature in the medical refrigerating box.
Step 4, calculating a proportionality coefficient K according to a preset in-box target temperature SP(S) and an integral coefficient KI(S), the working frequency F of the inverter compressor is obtained by utilizing PI control, and the method comprises the following steps:
step 4.1, calculating the proportionality coefficient KP(S) and an integral coefficient KI(S) the following:
KP(S)＝A1S+b1
KI(S)＝A2S+b2
in the formula, A1、A2Is a coefficient of a first order term, b1、b2Is constant and 0<A1<1，0<A2<2，1<b1<5，5<b2<20。
And 4.2, calculating the output quantity of PI control as follows:
wherein e (t) is the input for PI control, i.e. the temperature difference, u (t)SIs the output of PI control.
And 4.3, calculating the working frequency F of the variable frequency compressor according to the output quantity of the PI control as follows:
F＝DS×u(t)S
in the formula, DSIs the conversion coefficient under PI control.
And 5, controlling the rotating speed of the variable frequency compressor according to the working frequency F to realize primary temperature control of the medical refrigerating box.
For the specific limitations of the step executed by the microcontroller in the medical refrigerator, reference may be made to the above-mentioned specific limitations of the method for rapidly and accurately controlling the temperature of the medical refrigerator, and details thereof will not be described herein.
In order to ensure the normal operation of the medical refrigerating box, the medical refrigerating box of the present embodiment further comprises a power circuit for supplying power to the microcontroller, which converts AC power to low voltage DC power.
It should be noted that the medical refrigerator provided in the present application includes only the main basic components, and a scheme of simply expanding the components or a scheme of adding necessary components based on the present embodiment still belongs to the protection scope of the present application.
For example, as shown in fig. 3, in another embodiment, an adaptive frequency conversion system of a refrigeration compressor is provided, which further includes a refrigeration blower, a hardware detection protection circuit, a sterilization module, a display keypad, a refrigeration lighting lamp, a refrigeration door switch circuit, and the like, in addition to the microcontroller, the internal temperature sensor, and the ambient temperature sensor mentioned above in the present embodiment.
The circuits are all existing circuits, and in order to illustrate that the medical refrigerating box has strong expansibility, the refrigerating fan is controlled by the microcontroller to provide circulating air for the interior of the medical refrigerating box; the hardware detection protection circuit is used for detecting the total current of the medical refrigerating box to realize rapid protection; the sterilization module is controlled by the microcontroller to sterilize the interior of the medical refrigerating box; the refrigeration illuminating lamp is controlled by the microcontroller to provide illumination for the interior of the medical refrigeration box; the display key board is used for improving the man-machine interaction performance of the medical refrigerating box; the switch circuit of the refrigeration door is controlled by the microcontroller to automatically control the opening and closing of the refrigeration door, and the use experience is improved.
In one embodiment, the scaling factor K is calculated based on the ambient temperature C of the environment in which the medical cooler is locatedP(C) And obtaining the working frequency F of the inverter compressor by utilizing P control, and executing the following operations:
step 3.1, calculating a proportionality coefficient K according to the ambient temperature CP(C) The following were used:
if C is less than or equal to T1, the proportionality coefficient KP(C) Get KP1(ii) a If T1<C is less than or equal to T2, the proportionality coefficient KP(C) Get KP2(ii) a If T2<C is less than or equal to T3, the proportionality coefficient KP(C) Get KP3(ii) a If T3<C is less than or equal to T4, the proportionality coefficient KP(C) Get KP4(ii) a If C>T4, the proportionality coefficient KP(C) Get KP5(ii) a And KP5>KP4>KP3>KP2>KP1。
And 3.2, calculating the output quantity of P control as follows:
u(t)C＝KP(C)e(t)
in the formula, u (t)CThe output quantity is controlled by P.
And 3.3, calculating the working frequency F of the variable frequency compressor according to the output quantity controlled by the P as follows:
F＝DC×u(t)C
in the formula, DCIs the conversion coefficient under control of P.
In one embodiment, the KP1>0 and KP5<10。
In order to intuitively explain that the rapid and accurate temperature control method for the medical refrigerator has the effects of rapid and accurate temperature control, a test example is used for explanation.
Setting test parameters: the condition threshold value delta M is 5 ℃, the target temperature S is 10 ℃, and K isP5＝2.0，KP4＝1.8，KP3＝1.2，KP2＝0.9，KP1＝0.5，A1＝0.5，A2＝1.0，b1＝2.0，b2＝10.0，Ds＝20，DC＝30，T1＝20℃，T2＝30℃，T3＝40℃，T4＝45℃。
Test subjects: a medical refrigerator with a volume of 90 liters is used as a test object, the temperature of the refrigerator is set to be 0.0-10.0 ℃, and the number of the refrigerators is 10.
The test process comprises the following steps: all test objects are placed in an environment with the same environmental temperature, based on the test objects and the test parameters, half of the test objects are controlled to operate based on the conventional PID control, half of the test objects operate based on the rapid and accurate temperature control method of the medical refrigerator, test data are recorded, and a temperature control curve is obtained and is shown in figure 4.
And (3) test results: according to the results shown in fig. 4, the temperature control speed of the present application is faster than that of the conventional PID, and the temperature control precision is higher and the temperature fluctuation is very small. According to the temperature curve of the application, when the temperature difference is larger than the condition threshold value, the control P can enable the temperature in the refrigerator to quickly approach the target temperature; when the temperature difference is smaller than the condition threshold, the PI control can shorten the adjusting time and can realize stable and accurate control.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. A quick and accurate temperature control method for a medical refrigerating box is used for controlling the rotating speed of a variable frequency compressor in the medical refrigerating box to realize temperature control, and is characterized in that the quick and accurate temperature control method for the medical refrigerating box comprises the following steps:
step 1, acquiring the actual temperature in a medical refrigerating box, and calculating the temperature difference between a preset target temperature in the box and the actual temperature in the box;
step 2, if the temperature difference is larger than a condition threshold value delta M, executing step 3; otherwise, executing step 4;
step 3, calculating the proportionality coefficient K according to the environment temperature C of the environment where the medical refrigerating box is locatedP(C) Controlling by utilizing P to obtain the working frequency F of the variable frequency compressor;
step 4, calculating a proportionality coefficient K according to a preset in-box target temperature SP(S) and an integral coefficient KI(S), the working frequency F of the inverter compressor is obtained by utilizing PI control, and the method comprises the following steps:
step 4.1, calculating the proportionality coefficient KP(S) and an integral coefficient KI(S) the following:
KP(S)＝A1S+b1
KI(S)＝A2S+b2
in the formula, A1、A2Is a coefficient of a first order term, b1、b2Is constant and 0 < A1＜1，0＜A2＜2，1＜b1＜5，5＜b2＜20；
And 4.2, calculating the output quantity of PI control as follows:
wherein e (t) is the input for PI control, i.e. the temperature difference, u (t)SIs the output quantity of PI control;
and 4.3, calculating the working frequency F of the variable frequency compressor according to the output quantity of the PI control as follows:
F＝DS×u(t)S
in the formula, DSIs a conversion coefficient under PI control;
and 5, controlling the rotating speed of the variable frequency compressor according to the working frequency F to realize primary temperature control of the medical refrigerating box.
2. The method as claimed in claim 1, wherein said calculating the scaling factor K is based on the ambient temperature C of the environment in which the medical cooler is locatedP(C) And the working frequency F of the variable frequency compressor is obtained by utilizing P control, and the method comprises the following steps:
step 3.1, calculating a proportionality coefficient K according to the ambient temperature CP(C) The following were used:
if C is less than or equal to T1, the proportionality coefficient KP(C) Get KP1(ii) a If T1 is more than C and less than or equal to T2, the proportionality coefficient KP(C) Get KP2(ii) a If T2 is more than C and less than or equal to T3, the proportionality coefficient KP(C) Get KP3(ii) a If T3 is more than C and less than or equal to T4, the proportionality coefficient KP(C) Get KP4(ii) a If C > T4, the proportionality coefficient KP(C) Get KP5(ii) a And KP5＞KP4＞KP3＞KP2＞KP1；
And 3.2, calculating the output quantity of P control as follows:
u(t)C＝KP(C)e(t)
in the formula, u (t)CAn output quantity controlled by P;
and 3.3, calculating the working frequency F of the variable frequency compressor according to the output quantity controlled by the P as follows:
F＝DC×u(t)C
in the formula, DCIs the conversion coefficient under control of P.
3. The method as claimed in claim 2, wherein said K is a number of KP1> 0 and KP5＜10。
4. The medical refrigerating box is characterized by comprising a variable frequency compressor for outputting cold, an internal temperature sensor arranged in a box of the medical refrigerating box, an annular temperature sensor arranged outside the box of the medical refrigerating box, and a microcontroller connected with the internal temperature sensor, the annular temperature sensor and the variable frequency compressor, wherein the microcontroller comprises a memory and a processor, the memory stores a computer program, and the processor executes the computer program to realize the following steps:
step 1, receiving the actual temperature in the medical refrigerating box fed back by the internal temperature sensor, and calculating the temperature difference between the preset target temperature in the medical refrigerating box and the actual temperature in the medical refrigerating box;
step 2, if the temperature difference is larger than a condition threshold value delta M, executing step 3; otherwise, executing step 4;
step 3, receiving the environment temperature C of the environment where the medical refrigerating box is located and fed back by the environment temperature sensor, and calculating a proportionality coefficient K according to the environment temperature CP(C) Controlling by utilizing P to obtain the working frequency F of the variable frequency compressor;
step 4, calculating a proportionality coefficient K according to a preset in-box target temperature SP(S) and an integral coefficient KI(S), the working frequency F of the inverter compressor is obtained by utilizing PI control, and the method comprises the following steps:
step 4.1, calculating the proportionality coefficient KP(S) and an integral coefficient KI(S) the following:
KP(S)＝A1S+b1
KI(S)＝A2S+b2
in the formula, A1、A2Is a coefficient of a first order term, b1、b2Is constant and 0 < A1＜1，0＜A2＜2，1＜b1＜5，5＜b2＜20；
And 4.2, calculating the output quantity of PI control as follows:
wherein e (t) is the input for PI control, i.e. the temperature difference, u (t)SIs the output quantity of PI control;
and 4.3, calculating the working frequency F of the variable frequency compressor according to the output quantity of the PI control as follows:
F＝DS×u(t)S
in the formula, DS is a conversion coefficient under PI control;
and 5, controlling the rotating speed of the variable frequency compressor according to the working frequency F to realize primary temperature control of the medical refrigerating box.
5. The medical cooler of claim 4, wherein said scaling factor K is calculated based on an ambient temperature C of an environment in which said medical cooler is locatedP(C) And obtaining the working frequency F of the inverter compressor by utilizing P control, and executing the following operations:
step 3.1, calculating a proportionality coefficient K according to the ambient temperature CP(C) The following were used:
if C is less than or equal to T1, the proportionality coefficient KP(C) Get KP1(ii) a If T1 is more than C and less than or equal to T2, the proportionality coefficient KP(C) Get KP2(ii) a If T2 is more than C and less than or equal to T3, the proportionality coefficient KP(C) Get KP3(ii) a If T3 is more than C and less than or equal to T4, the proportionality coefficient KP(C) Get KP4(ii) a If C > T4, the proportionality coefficient KP(C) Get KP5(ii) a And KP5＞KP4＞KP3＞KP2＞KP1；
And 3.2, calculating the output quantity of P control as follows:
u(t)C＝KP(C)e(t)
in the formula, u (t)CAn output quantity controlled by P;
and 3.3, calculating the working frequency F of the variable frequency compressor according to the output quantity controlled by the P as follows:
F＝DC×u(t)C
in the formula, DCIs the conversion coefficient under control of P.
6. The medical cooler of claim 5, wherein said K isP1> 0 and KP5＜10。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011580029.3A CN112648794B (en) | 2020-12-28 | 2020-12-28 | Rapid and accurate temperature control method for medical refrigerator and medical refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011580029.3A CN112648794B (en) | 2020-12-28 | 2020-12-28 | Rapid and accurate temperature control method for medical refrigerator and medical refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112648794A true CN112648794A (en) | 2021-04-13 |
| CN112648794B CN112648794B (en) | 2022-06-21 |
Family
ID=75363285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011580029.3A Active CN112648794B (en) | 2020-12-28 | 2020-12-28 | Rapid and accurate temperature control method for medical refrigerator and medical refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112648794B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114543435A (en) * | 2022-02-16 | 2022-05-27 | 长虹美菱股份有限公司 | Back icing control method for direct-cooling refrigerator and direct-cooling refrigerator with back icing control method |
| CN115435543A (en) * | 2021-06-02 | 2022-12-06 | 青岛海尔生物医疗股份有限公司 | Method and device for controlling variable-frequency compressor of refrigerator and refrigerator |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5932734A (en) * | 1982-08-18 | 1984-02-22 | Mitsubishi Electric Corp | Hot water supplier |
| US4789025A (en) * | 1987-11-25 | 1988-12-06 | Carrier Corporation | Control apparatus for refrigerated cargo container |
| US5929581A (en) * | 1997-10-22 | 1999-07-27 | Hewlett-Packard Company | Proportional integral fan controller for computer |
| CN102749939A (en) * | 2012-07-27 | 2012-10-24 | 武汉光迅科技股份有限公司 | Closed cavity pulse width modulation (PWM) heating control method and system thereof |
| CN103941778A (en) * | 2014-03-26 | 2014-07-23 | 太仓微芯电子科技有限公司 | Temperature control system and method for miniature constant-temperature box |
| CN204421479U (en) * | 2015-01-13 | 2015-06-24 | 郭志君 | The outer intelligent temperature controller of refrigerator machine |
| CN106123234A (en) * | 2016-07-04 | 2016-11-16 | 青岛海尔空调器有限总公司 | A kind of method regulating outdoor machine of air-conditioner electronic expansion valve |
| CN106524395A (en) * | 2016-10-19 | 2017-03-22 | 青岛海尔空调器有限总公司 | Air-conditioner frequency control method and device and air conditioner |
| CN108302692A (en) * | 2018-01-11 | 2018-07-20 | 广东美的制冷设备有限公司 | Air conditioning control method and air conditioner |
| CN109654790A (en) * | 2019-01-22 | 2019-04-19 | 安徽中科都菱商用电器股份有限公司 | Medical refrigerated cabinet accurate temperature controlling method |
| CN110425817A (en) * | 2019-08-28 | 2019-11-08 | 广东富信科技股份有限公司 | Self-adaptive temperature adjusting method, the apparatus and system of breast milk cold storage plant |
| CN111491408A (en) * | 2020-05-07 | 2020-08-04 | 中电海康集团有限公司 | Constant temperature control method of steaming and baking oven |
| CN111982302A (en) * | 2020-08-24 | 2020-11-24 | 广东工业大学 | Temperature measurement method with noise filtering and environment temperature compensation |
-
2020
- 2020-12-28 CN CN202011580029.3A patent/CN112648794B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5932734A (en) * | 1982-08-18 | 1984-02-22 | Mitsubishi Electric Corp | Hot water supplier |
| US4789025A (en) * | 1987-11-25 | 1988-12-06 | Carrier Corporation | Control apparatus for refrigerated cargo container |
| US5929581A (en) * | 1997-10-22 | 1999-07-27 | Hewlett-Packard Company | Proportional integral fan controller for computer |
| CN102749939A (en) * | 2012-07-27 | 2012-10-24 | 武汉光迅科技股份有限公司 | Closed cavity pulse width modulation (PWM) heating control method and system thereof |
| CN103941778A (en) * | 2014-03-26 | 2014-07-23 | 太仓微芯电子科技有限公司 | Temperature control system and method for miniature constant-temperature box |
| CN204421479U (en) * | 2015-01-13 | 2015-06-24 | 郭志君 | The outer intelligent temperature controller of refrigerator machine |
| CN106123234A (en) * | 2016-07-04 | 2016-11-16 | 青岛海尔空调器有限总公司 | A kind of method regulating outdoor machine of air-conditioner electronic expansion valve |
| CN106524395A (en) * | 2016-10-19 | 2017-03-22 | 青岛海尔空调器有限总公司 | Air-conditioner frequency control method and device and air conditioner |
| CN108302692A (en) * | 2018-01-11 | 2018-07-20 | 广东美的制冷设备有限公司 | Air conditioning control method and air conditioner |
| CN109654790A (en) * | 2019-01-22 | 2019-04-19 | 安徽中科都菱商用电器股份有限公司 | Medical refrigerated cabinet accurate temperature controlling method |
| CN110425817A (en) * | 2019-08-28 | 2019-11-08 | 广东富信科技股份有限公司 | Self-adaptive temperature adjusting method, the apparatus and system of breast milk cold storage plant |
| CN111491408A (en) * | 2020-05-07 | 2020-08-04 | 中电海康集团有限公司 | Constant temperature control method of steaming and baking oven |
| CN111982302A (en) * | 2020-08-24 | 2020-11-24 | 广东工业大学 | Temperature measurement method with noise filtering and environment temperature compensation |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115435543A (en) * | 2021-06-02 | 2022-12-06 | 青岛海尔生物医疗股份有限公司 | Method and device for controlling variable-frequency compressor of refrigerator and refrigerator |
| CN115435543B (en) * | 2021-06-02 | 2023-07-21 | 青岛海尔生物医疗股份有限公司 | Method and device for controlling variable frequency compressor of refrigerator and refrigerator |
| CN114543435A (en) * | 2022-02-16 | 2022-05-27 | 长虹美菱股份有限公司 | Back icing control method for direct-cooling refrigerator and direct-cooling refrigerator with back icing control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112648794B (en) | 2022-06-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106091231B (en) | The control method and equipment of air-conditioning equipment in a kind of data center | |
| EP3441700B1 (en) | Refrigerator and partition control method | |
| CN112648794B (en) | Rapid and accurate temperature control method for medical refrigerator and medical refrigerator | |
| AU2012316722B2 (en) | Heating, ventilation, and air conditioning management system and method | |
| CN111397132B (en) | Industrial machine room energy-saving regulation and control system and method based on big data and storage medium | |
| CN105953369B (en) | A kind of control method for frequency conversion air conditioner and device | |
| CN104533819B (en) | Method and device for controlling fan motor of refrigerator and refrigerator | |
| US8186173B2 (en) | Refrigerator unit and/or freezer unit | |
| CN104534810B (en) | Control method and device of refrigerator compressor and refrigerator | |
| US20090088873A1 (en) | Apparatus and method for thermal management of electronic devices | |
| JP2010078198A (en) | Cooling system | |
| CN108253603B (en) | Air conditioner control method, device and system and air conditioner | |
| CN109764629B (en) | Variable frequency refrigerator and control method thereof | |
| US20210278115A1 (en) | Speed control strategies for a condenser fan in a refrigeration system | |
| US9664433B2 (en) | Refrigerator with energy consumption optimization using adaptive fan delay | |
| CN109708394B (en) | Control method and control system for cooling fan of refrigerator | |
| CN112066635A (en) | Storehouse temperature control method, device and system | |
| CN104006502A (en) | Air conditioner operating method and device | |
| CA2881086A1 (en) | System for controlling operation of an hvac system | |
| JP2010025466A (en) | Heat source system | |
| US20140165636A1 (en) | Precise Air Conditioning System Fan Control Method and Apparatus, and Precise Air Conditioning System | |
| CN107726700B (en) | Refrigerator control method and system | |
| US11236937B2 (en) | Cooling control method for refrigerator | |
| CN108369056B (en) | Apparatus and method for multifunction networking | |
| CN112665239B (en) | Water chilling unit starting method and device and water chilling unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |