CN109436581B - Multi-mode cold accumulation fresh-keeping transport case control system based on surplus cold volume prediction - Google Patents
Multi-mode cold accumulation fresh-keeping transport case control system based on surplus cold volume prediction Download PDFInfo
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- CN109436581B CN109436581B CN201811590154.5A CN201811590154A CN109436581B CN 109436581 B CN109436581 B CN 109436581B CN 201811590154 A CN201811590154 A CN 201811590154A CN 109436581 B CN109436581 B CN 109436581B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
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- 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
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/042—Air treating means within refrigerated spaces
- F25D17/045—Air flow control arrangements
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- 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
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
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- 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
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- 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
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
Abstract
The invention discloses a control system of a multi-mode cold accumulation fresh-keeping fruit and vegetable transport box based on residual cold quantity prediction, which comprises an initial working condition input module, a cargo initial state estimation module, a residual cold quantity estimation module and a cold quantity release control module. The system obtains cargo information and destination information through the initial working condition module, estimates the initial temperature of the cargo through the cargo initial state estimation module, and calculates the precooling cold energy loss. And predicting through a residual cold quantity estimation module and a prediction model, observing cold energy through the static cooling rate, filtering the prediction and observation results, and correcting the residual cold energy. And based on the residual cold energy and the residual path, the cold energy release control module selects a plurality of modes of rapid cooling, energy-saving endurance and constant quality. The invention provides a control method for a cold storage type fruit and vegetable fresh-keeping transport case, which improves the estimation precision of cold storage and cold energy, enhances the effective temperature control time of the cold energy in the long-distance transport process and ensures the storage temperature of fruits and vegetables.
Description
Technical Field
The invention relates to the technical field of fruit and vegetable fresh-keeping storage and transportation, in particular to a multi-mode cold accumulation fresh-keeping fruit and vegetable transport box control system which takes a cold accumulation plate as a cold source and is based on residual cold amount prediction.
Background
At present, a replaceable cold accumulation plate type fruit and vegetable transport case is energy storage and fresh keeping equipment, and the fresh keeping process is a slow energy release process. The management of the energy of the cold accumulation plate is a core link of the control system. There has been little research on energy control systems for mobile cold storage devices. The mobile fresh-keeping equipment needs to comprehensively consider factors such as residual energy of the cold storage plate, residual distance, heat exchange of the mobile external environment and the like, reasonably utilize cold source energy in the transportation process, ensure that a full cold chain is continuously cooled, and keep the temperature in the box at a proper temperature. Therefore, a cold energy management control system with residual cold quantity prediction is required to be designed according to the characteristics of cold storage fruit and vegetable fresh-keeping equipment.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a multi-mode control system with residual cold energy monitoring and initial goods temperature estimation for solving the problems of energy management and system control of a cold storage type fruit and vegetable fresh-keeping transport cabinet.
The purpose of the invention is realized by the following technical scheme:
a multi-mode cold accumulation fresh-keeping transport case control system based on residual cold quantity prediction mainly comprises a control part and a transport case for fresh keeping; the control part is arranged in the transport box.
Specifically, the transport case comprises storage area, heat transfer district, return air duct, return air chamber, air-out channel and air-out chamber. The transport case mainly comprises a controller, an air return fan, a storage area temperature sensor, an air outlet fan, an air opening adjusting device, a cold storage plate, a lithium battery and a heat exchange area temperature sensor, wherein the air return fan is electrically connected with the controller respectively, and the heat exchange area temperature sensor is arranged in a storage area. And two ends of the air return channel are respectively communicated with the storage area and the air return chamber. And two ends of the air outlet channel are respectively communicated with the storage area and the air outlet chamber. The heat exchange area is respectively communicated with the air return chamber and the air outlet chamber. The air return fan is arranged at an inlet of the air return duct, the air outlet fan is arranged at an outlet of the air outlet duct, and the air port opening adjusting device is arranged at the inlet of the air outlet duct; the cold accumulation plate is arranged in the heat exchange area.
Specifically, the control part mainly comprises an initial working condition module, a cargo initial state estimation module, a residual cold quantity estimation module and a cold quantity release control module.
And the initial working condition module selects target fruits and vegetables, fruit and vegetable weights, destinations and transportation time through the control interface to obtain cargo information and destination information.
The initial state estimation module of the goods estimates the initial temperature of the goods through the time required by the initial cooling of the goods to reach the target temperature, and is used for calculating the total cold energy required by precooling.
And the residual cold energy estimation module predicts by using the prediction model, observes cold energy through the static cooling rate, filters the prediction and observation results and corrects residual cold energy information.
And the cold quantity release control module selects a plurality of modes of a quick precooling mode, an energy-saving endurance mode or a quality constant temperature mode based on the residual cold energy, the residual path and the residual time information.
The control system regulates and controls the temperature of the storage area by controlling the air quantity of the air return fan and the air outlet fan and the opening size of the air port, so that the aims of a rapid cooling mode, an energy-saving endurance mode and a quality constant temperature mode are fulfilled.
As a preferable aspect of the present invention, the initial operating condition module further includes: and estimating the consumption cold energy of the primary cooling through the primary cooling time. Meanwhile, the initial temperature of the goods is estimated according to the data of the temperature sensor, the specific heat capacity of the goods, the external temperature heat transfer of the box body and the initial temperature of the cold storage plate. And calculating cold energy required by initial precooling of the goods and the whole body in the box body based on the initial temperature. The main basis for the cooling intensity in the rapid cooling mode is as follows.
As a preferable aspect of the present invention, the remaining cold estimating module further includes: based on the inlet air temperature and the outlet air temperature of the refrigerating chamber, the cold storage amount of the cold storage plate is estimated through an energy release curve measured through tests and used as a predicted value. The temperature drop was measured based on the 10 minute state of rest of the heat transfer zone and was taken as a measure of the cold storage capacity of the cold storage plate. And establishing a Kalman filter based on the measured value and the predicted value to obtain the corrected cold accumulation amount of the cold accumulation plate.
As a preferable aspect of the present invention, the coldness discharge control module further includes: and selecting different working modes according to the residual cold quantity of the cold storage plate and the time for reaching the destination. And when the air conditioner is initially cooled, the rapid cooling mode is selected. And when the cold quantity is insufficient, selecting an energy-saving mode. When the cold quantity is sufficient, a constant temperature fresh-keeping mode is selected.
As a preferable aspect of the present invention, the rapid cooling mode includes: in order to meet the requirements of the initial refrigeration stage, the fruit and vegetable and the box body for rapid cooling, the system fan opens a large air quantity, the heat exchange area of the strong cold accumulation plate is increased, the internal circulation strength of the box is enhanced, and the temperature of the air outlet is controlled to prevent local cold damage.
As a preferable aspect of the present invention, the energy saving mode includes: in order to reduce the cold energy loss of the heat exchange area, the fan stops working intermittently, and heat exchange is carried out through the pressure difference between the high-temperature area and the low-temperature area to generate air flow. When the temperature difference in the box is too large, the fan in the box is turned on again to force the air to circulate and regulate the temperature.
As a preferable scheme of the present invention, the constant temperature fresh-keeping mode includes: in order to ensure constant temperature in the box and reduce fruit and vegetable loss, the system increases the sampling frequency of the temperature sampling system, regulates and controls the wind speed and the wind direction of the fan in real time, ensures the front and back air flow in the box and reduces the front and back temperature difference.
Furthermore, in order to obtain a better fresh-keeping effect, the outer wall of the transport case adopts a multi-layer structure and comprises two polyurethane plate layers and a vacuum heat insulation plate layer. The vacuum heat insulation plate layer is positioned between the two polyurethane plate layers and is fixedly connected with the polyurethane plate layers.
As the preferred scheme of the invention, in order to improve the efficiency of the rapid cooling mode, the return air fan and the air outlet fan are designed in two groups.
Compared with the prior art, the invention also has the following advantages:
(1) The multi-mode cold accumulation fresh-keeping transport case control system based on residual cold quantity prediction can remarkably improve the estimation precision of cold accumulation cold energy, enhance the effective temperature control time of the cold energy in the long-distance transport process and ensure the storage temperature of fruits and vegetables.
(2) The multi-mode cold accumulation fresh-keeping transport case control system based on residual cold amount prediction comprehensively considers the factors of cold accumulation residual energy, residual distance, heat exchange of a mobile external environment and the like, ensures reasonable utilization of cold source energy in the transport process, ensures continuous cold of a full cold chain, and keeps the temperature in a case at an appropriate temperature.
(3) The residual cold quantity estimation module provided by the invention predicts the cold energy released by the cold storage plate through the cold energy prediction model. And measuring the temperature descending amplitude through the standing state of the heat exchange zone for 10 minutes, and obtaining a more accurate observation value through the corresponding relation between the descending amplitude and the residual cold quantity. Based on the predicted value and the observed value, the cold storage plate can be estimated accurately for a long time.
(4) The initial state estimation module of the goods provided by the invention estimates the initial temperature of the goods by taking the time of first cooling as a characteristic value, and estimates the cold energy required by precooling. The estimation method integrates factors such as goods, a box body and an external environment, can more accurately estimate the scene during precooling, and improves the estimation precision of precooling cold energy.
Drawings
Fig. 1 is a schematic diagram of the structure and the flow of the multi-mode cold accumulation fresh-keeping transport box control system based on the residual cold prediction provided by the invention.
Fig. 2 is a schematic structural diagram of the transport case provided by the invention.
Fig. 3 isbase:Sub>A cross-sectional view atbase:Sub>A-base:Sub>A in fig. 2.
The reference numerals in the above figures illustrate:
1-a controller, 2-a return air chamber, 3-a return air duct, 4-a return air fan, 5-a storage area temperature sensor, 6-an air outlet chamber, 7-an air outlet duct, 8-an air outlet fan, 9-a heat exchange area, 10-an air port opening degree adjusting device, 11-a cold storage plate, 12-a lithium battery and 13-a heat exchange area temperature sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described below with reference to the accompanying drawings and examples.
Example 1:
as shown in fig. 1 to fig. 3, the present embodiment discloses a multi-mode cold accumulation fresh-keeping transport case control system based on residual cold amount prediction, the control system mainly includes a control part and a transport case for fresh keeping; the control part is installed in the transport box.
Specifically, the transport case comprises storage area, heat transfer district 9, return air duct 3, return air chamber 2, air-out channel 7 and air-out chamber 6. The transport case mainly comprises a controller 1, an air return fan 4, a storage area temperature sensor 5, an air outlet fan 8, an air opening adjusting device 10, a cold storage plate 11, a lithium battery 12 and a heat exchange area temperature sensor 13, wherein the air return fan 4 is electrically connected with the controller 1, the storage area temperature sensor is installed in a storage area, and the heat exchange area temperature sensor 13 is installed in a heat exchange area 9. And two ends of the air return duct 3 are respectively communicated with the storage area and the air return chamber 2. And two ends of the air outlet channel 7 are respectively communicated with the storage area and the air outlet chamber 6. The heat exchange area 9 is respectively communicated with the return air chamber 2 and the outlet air chamber 6. The air return fan 4 is arranged at the inlet of the air return duct 3, the air outlet fan 8 is arranged at the outlet of the air outlet duct 7, and the air inlet opening adjusting device 10 is arranged at the inlet of the air outlet duct 7; the cold accumulation plate 11 is installed in the heat exchange area 9.
Specifically, the control part mainly comprises an initial working condition module, a cargo initial state estimation module, a residual cold quantity estimation module and a cold quantity release control module.
The initial working condition module selects target fruits and vegetables, fruit and vegetable weights, destinations and transportation time through a control interface to obtain goods information and destination information.
The initial cargo state estimation module estimates the initial temperature of the cargo through the time required for the initial cooling of the cargo to reach the target temperature and is used for calculating the total cold energy required by precooling.
And the residual cold energy estimation module predicts by using the prediction model, observes cold energy through the static cooling rate, filters the prediction and observation results and corrects residual cold energy information.
And the cold quantity release control module selects a plurality of modes of a quick precooling mode, an energy-saving endurance mode or a quality constant temperature mode based on the residual cold energy, the residual path and the residual time information.
The control system regulates and controls the temperature of the storage area by controlling the air quantity of the air return fan 4 and the air outlet fan 8 and the opening degree of the air inlet, so that the aims of a rapid cooling mode, an energy-saving cruising mode and a quality constant temperature mode are fulfilled.
As a preferable aspect of the present invention, the initial operating condition module further includes: and estimating the consumption cold energy of the primary cooling through the primary cooling time. Meanwhile, the initial temperature of the goods is estimated according to the data of the temperature sensor, the specific heat capacity of the goods, the external temperature heat transfer of the box body and the initial temperature of the cold storage plate 11. And calculating cold energy required by initial precooling of the goods and the whole body in the box body based on the initial temperature. The main basis for the cooling intensity in the rapid cooling mode is as follows.
As a preferable aspect of the present invention, the remaining cold estimating module further includes: based on the inlet air and outlet air temperatures of the refrigerating chamber, the cold storage amount of the cold storage plate 11 is estimated through an energy release curve measured through experiments and used as a predicted value. The temperature decrease range is measured based on the standing state of the heat transfer zone for 10 minutes and is taken as a measurement value of the cold storage amount of the cold storage plate 11. And establishing a Kalman filter based on the measured value and the predicted value to obtain the cold accumulation amount of the cold accumulation plate 11.
As a preferable aspect of the present invention, the refrigeration release control module further includes: different working modes are selected according to the residual cold quantity of the cold storage plate 11 and the time of arriving at the destination. And when the air conditioner is initially cooled, the rapid cooling mode is selected. And when the cold quantity is insufficient, selecting an energy-saving mode. When the cold quantity is sufficient, a constant-temperature fresh-keeping mode is selected.
As a preferable aspect of the present invention, the rapid cooling mode includes: in order to meet the requirements of the initial refrigeration stage, the fruit and vegetable and the box body for rapid cooling, the system fan opens a large air quantity, the heat exchange area of the strong cold accumulation plate 11 is increased, the internal circulation strength of the box is enhanced, and meanwhile, the temperature of the air outlet is controlled to prevent local cold damage.
As a preferable aspect of the present invention, the energy saving mode includes: in order to reduce the cold energy loss of the heat exchange area 9, the fan stops working intermittently, and heat exchange is carried out through the pressure difference between the high-temperature area and the low-temperature area to generate air flow. When the temperature difference in the box is too large, the fan in the box is turned on again to force the air to circulate and regulate the temperature.
As a preferable scheme of the invention, the constant-temperature fresh-keeping mode comprises the following steps: in order to ensure constant temperature in the box and reduce fruit and vegetable loss, the system increases the sampling frequency of the temperature sampling system, regulates and controls the wind speed and the wind direction of the fan in real time, ensures the front and back air flow in the box and reduces the front and back temperature difference.
Furthermore, in order to obtain a better fresh-keeping effect, the outer wall of the transport case adopts a multi-layer structure and comprises two polyurethane plate layers and a vacuum heat insulation plate layer. The vacuum heat insulation plate layer is positioned between the two polyurethane plate layers and is fixedly connected with the polyurethane plate layers.
As a preferred scheme of the present invention, in order to improve the efficiency of the rapid cooling mode, the return air fan 4 and the outlet air fan 8 of the present invention both adopt two sets of designs.
Example 2:
as shown in fig. 2 and fig. 3, the control system of the multimode cold accumulation fresh-keeping fruit and vegetable transport case based on the residual cold prediction in the embodiment is provided. The control object is a fruit and vegetable transport case with a cold storage plate 11 as a cold source, and the fruit and vegetable transport case is composed of a controller 1, a return air chamber 2, a return air duct 3, a return air fan 4, a storage area temperature sensor 5, an air outlet fan 8, a heat exchange area 9, an air port opening degree adjusting device 10, a cold storage plate 11, a lithium battery 12 and a heat exchange area temperature sensor 13.
As shown in fig. 1, the control system of the multi-mode cold accumulation fresh-keeping fruit and vegetable transport box based on residual cold amount prediction adopts a multifunctional module design, and realizes the functions of transport state input, initial cargo state estimation, residual cold amount estimation of a cold accumulation plate 11, positioning, wireless communication, multi-mode refrigeration and the like according to the control system flow: which comprises the following steps:
and (4) inputting the transportation state, calling a working condition parameter input module by using an interface of the controller 1, and manually inputting information such as the type, the quality, the target distance, the delivery time and the like of the fruits and vegetables.
And the initial cargo state estimation module is used for estimating the initial temperature of the fruits and vegetables according to the initial cooling time and the environmental information of the external environmental temperature weather. And estimating the cooling energy of the box body according to the outdoor temperature, the target temperature and the specific heat of the box body. The initial temperature of the fruits and vegetables is estimated by the initial cooling time of the box body, the cooling time is in positive correlation with the initial temperature of the fruits and vegetables, meanwhile, the density, specific heat and other characteristics of different fruits and vegetables are considered, and corresponding curves of the initial temperatures of different fruits and vegetables and the initial cooling time are established through test fitting. And estimating the time and the cold energy required by the integral precooling of the fruits and the vegetables and the box body according to the initial states of the fruits and the vegetables and the initial state of the box body.
And the residual cold estimation module estimates the change of the air energy passing through the heat exchange area 9 through the temperature and the air speed of the air inlet and outlet channel to obtain a predicted value of the residual energy. And stopping the fan for 10 minutes at intervals, monitoring the temperature reduction degree of the heat exchange area 9, estimating the residual cold energy of the cold accumulation plate 11 as a cold amount observation value, correcting the predicted value according to the observation value, and ensuring the accuracy of cold amount estimation. The model used for observation is a corresponding curve model of the cold energy of the cold storage plate 11 and the temperature reduction rate of the heat exchange area 9, which is obtained through experiments under an ideal condition. The remaining cold energy can be monitored based on the curve. And (4) combining a prediction model and an observation model to accurately estimate the cold quantity of the cold accumulation plate 11.
And the cold quantity release control module realizes the selection of rapid cooling, energy-saving endurance and constant quality temperature based on the residual cold quantity provided by the residual cold quantity estimation module and the residual journey time obtained by the wireless system. The system adjusts the heat exchange condition of the cold accumulation plate 11 and the air by controlling the air quantity of the fan and the opening degree of an air port, and realizes the control of the cold quantity.
In the rapid cooling mode, the system fan is opened with large air quantity and the opening degree of the air port is maximum, so that the heat exchange area of the cold accumulation plate 11 is increased, and the cold air circulation strength in the box is enhanced. And meanwhile, the temperature of the air outlet is controlled to prevent local cold damage. The requirements of rapid cooling of fruits, vegetables and the box body at the initial stage of refrigeration are met.
The constant-temperature preservation mode reduces the loss of fruits and vegetables for guaranteeing constant temperature in the box, and the system increases the sampling frequency of the temperature sampling system, regulates and controls the wind speed and the opening of a wind gap of a fan in real time, guarantees the flow of air in the box from front to back, reduces the temperature difference in the box from front to back, and reduces the fluctuation of the temperature.
And calculating the residual cold energy, the cold energy release speed, the residual distance and the residual time, and when the residual cold energy cannot ensure that the constant temperature mode reaches the destination, the system enters an energy-saving mode. In the energy-saving mode, in order to reduce the cold energy loss of the heat exchange area 9, the fan stops working intermittently, and heat exchange is carried out through the pressure difference between the high-temperature area and the low-temperature area to generate air flow. When the temperature difference in the box is too large, the fan in the box is turned on again to force air circulation to adjust the temperature. The temperature in the box is not overhigh, and a large temperature difference can not occur.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (9)
1. A multi-mode cold accumulation fresh-keeping transport case control system based on surplus cold quantity prediction is characterized in that the control system comprises a control part and a transport case for keeping fresh; the control part is arranged in the transport box;
the transport case consists of a storage area, a heat exchange area, a return air duct, a return air chamber, an air outlet duct and an air outlet chamber, and comprises a controller, a return air fan, a storage area temperature sensor, an air outlet fan, an air port opening adjusting device, a cold storage plate, a lithium battery and a heat exchange area temperature sensor, wherein the return air fan, the storage area temperature sensor, the air outlet fan, the air port opening adjusting device, the cold storage plate, the lithium battery and the heat exchange area temperature sensor are respectively and electrically connected with the controller; two ends of the air return channel are respectively communicated with the storage area and the air return chamber; two ends of the air outlet channel are respectively communicated with the storage area and the air outlet chamber; the heat exchange area is respectively communicated with the air return chamber and the air outlet chamber; the air return fan is arranged at an inlet of the air return duct, the air outlet fan is arranged at an outlet of the air outlet duct, and the air port opening adjusting device is arranged at the inlet of the air outlet duct; the cold accumulation plate is arranged in the heat exchange area;
the control part comprises an initial working condition module, a cargo initial state estimation module, a residual cold quantity estimation module and a cold quantity release control module;
the initial working condition module selects target fruits and vegetables, fruit and vegetable weights, destinations and transportation time through a control interface to obtain cargo information and destination information;
the initial cargo state estimation module is used for estimating the initial temperature of the cargo by the time required for the initial cooling of the cargo to reach the target temperature and calculating the total cold energy required by precooling;
the residual cold energy estimation module predicts by using a prediction model, observes cold energy through the static cooling rate, filters the prediction and observation results and corrects residual cold energy information;
the cold energy release control module selects a rapid precooling mode, an energy-saving endurance mode or a quality constant temperature mode based on the residual cold energy, the residual path and the residual time information;
the control system regulates and controls the temperature of the storage area by controlling the air quantity of the return air fan and the air outlet fan and the opening degree of the air inlet, so that the aims of a rapid cooling mode, an energy-saving endurance mode and a quality constant temperature mode are fulfilled.
2. The multi-mode cold accumulation fresh-keeping transport case control system based on cold surplus capacity prediction as claimed in claim 1, wherein the initial working condition module further comprises: estimating the cold energy consumed by the primary cooling through the primary cooling time; meanwhile, estimating the initial temperature of the goods according to the data of the temperature sensor, the specific heat capacity of the goods, the external temperature heat transfer of the box body and the initial temperature of the cold storage plate; calculating cold energy required by initial precooling of the goods and the whole body in the box body based on the initial temperature; the main basis for the cooling intensity in the rapid cooling mode is as follows.
3. The multi-mode cold accumulation fresh-keeping transport box control system based on cold surplus prediction as claimed in claim 1, wherein the cold surplus estimation module further comprises: estimating the cold accumulation amount of the cold accumulation plate through an energy release curve measured by tests based on the air inlet and outlet temperatures of the refrigerating chamber and taking the cold accumulation amount as a predicted value; measuring the temperature reduction amplitude based on the 10-minute standing state of the heat exchange area, and taking the temperature reduction amplitude as a measured value of the cold accumulation amount of the cold accumulation plate; and establishing a Kalman filter based on the measured value and the predicted value to obtain the cold storage amount of the repaired cold storage plate.
4. The multi-mode cold accumulation fresh-keeping transport box control system based on cold surplus prediction as recited in claim 1, wherein the cold release control module further comprises: selecting different working modes according to the residual cold quantity of the cold storage plate and the time for reaching the destination; selecting a rapid cooling mode during primary refrigeration; when the cold quantity is insufficient, selecting an energy-saving mode; when the cold quantity is sufficient, a constant temperature fresh-keeping mode is selected.
5. The multi-mode cold accumulation fresh-keeping transportation box control system based on cold surplus prediction as claimed in claim 4, wherein the rapid cooling mode comprises: in order to meet the requirements of the initial refrigeration stage, the fruit and vegetable and the box body for rapid cooling, the system fan opens a large air quantity, the heat exchange area of the strong cold accumulation plate and the circulating gas is increased, the internal circulation strength of the box is enhanced, and the temperature of the air outlet is controlled to prevent local cold damage.
6. The multi-mode cold accumulation fresh-keeping transportation box control system based on cold surplus prediction as claimed in claim 4, wherein the energy saving mode comprises: in order to reduce the cold energy loss of the heat exchange area, the fan stops working intermittently, and heat exchange is carried out through the pressure difference between the high-temperature area and the low-temperature area to generate air flow; when the temperature difference in the box is too large, the fan in the box is turned on again to force the air to circulate and regulate the temperature.
7. The multi-mode cold accumulation fresh-keeping transportation box control system based on cold surplus prediction as claimed in claim 4, wherein the constant temperature fresh-keeping mode comprises: in order to ensure constant temperature in the box and reduce the loss of fruits and vegetables, the system increases the sampling frequency of the temperature sampling system, regulates and controls the wind speed and the wind direction of the fan in real time, ensures the front and back air flow in the box and reduces the front and back temperature difference.
8. The multi-mode cold accumulation and preservation transport case control system based on residual cold quantity prediction as claimed in claim 1, wherein the outer wall of the transport case is of a multi-layer structure and comprises two polyurethane plate layers and a vacuum heat insulation plate layer; the vacuum heat insulation plate layer is positioned between the two polyurethane plate layers and is fixedly connected with the polyurethane plate layers.
9. The multi-mode cold accumulation fresh-keeping transport case control system based on cold surplus prediction as claimed in claim 1, wherein the return air fan and the outlet air fan are both designed in two groups.
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| CN112648784A (en) * | 2019-10-10 | 2021-04-13 | 中车石家庄车辆有限公司 | Method and device for determining cold accumulation residual service life and computer equipment |
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