Dietary cabinet control method and device, dietary cabinet, storage medium and program product

Abstract

The invention discloses a control method and device of a meal cabinet, the meal cabinet, a storage medium and a computer program product. The meal cabinet comprises a warehouse, a refrigeration warehouse and a heating warehouse, and the refrigeration warehouse can send cold energy in the refrigeration warehouse into the warehouse through a first fan and a first air valve; the heating bin can send heat in the heating bin into the warehouse through the second draught fan and the second air valve. The method comprises the steps that during refrigeration, the rotating speed of a first fan is controlled according to the actual temperature and the target temperature of a warehouse and the cooling capacity in a refrigeration bin, and the opening degree of a first air valve is controlled according to the actual temperature and the target temperature; and during heating, the rotating speed of the second fan is controlled according to the actual temperature and the target temperature of the warehouse and heat in the heating warehouse, and the opening degree of the second air valve is controlled according to the actual temperature and the target temperature. According to the scheme, the refrigeration bin and the heating bin are arranged to supply cold and heat to the warehouse, meanwhile, the rotating speed of the draught fan and the opening degree of the air valve are controlled, the requirements for refrigeration and heating of the meal cabinet are met, and the accuracy of warehouse temperature control is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of food storage, and specifically relates to a control method, device, meal cabinet, storage medium and computer program product of a meal cabinet, and in particular to a control method, device, meal cabinet, storage medium and computer program product of a cargo compartment temperature of a meal cabinet. Background Art

[0002] As the pace of social life accelerates, more and more people choose to order takeout or eat out. Lunch box vending machines are gradually being used in the catering industry. They can quickly and conveniently provide meal services, effectively improve meal delivery efficiency, reduce labor costs, and provide 24-hour uninterrupted lunch box sales services. However, most existing lunch box vending machines only have a single refrigeration or heating function, which cannot meet consumers' needs for hot and cold foods at the same time, and cannot independently and accurately control the temperature of foods of different types and shelf life requirements.

[0003] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The object of the present invention is to provide a control method, device, meal cabinet, storage medium and computer program product for a meal cabinet, so as to solve the problem that the meal cabinet cannot meet the requirements of refrigeration and heating at the same time and the temperature control is not accurate in the related schemes, so as to achieve the goal of providing cooling and heating for the cargo warehouse by setting a refrigeration warehouse and a heating warehouse, and controlling the speed of the fan and the opening of the air valve at the same time to accurately control the temperature in the cargo warehouse, which not only meets the requirements of refrigeration and heating of the meal cabinet, but also improves the accuracy of the temperature control of the cargo warehouse, thereby improving the utilization efficiency of the meal cabinet and the food quality of the food stored in the meal cabinet.

[0005] The present invention provides a control method for a meal cabinet, the meal cabinet comprises a cargo compartment, a refrigeration compartment and a heating compartment; the refrigeration compartment is provided with an evaporator and a first fan, the heating compartment is provided with a condenser and a second fan; the cargo compartment comprises a first air inlet and a second air inlet; the first fan is used to deliver the cold in the refrigeration compartment into the cargo compartment through the first air inlet; the second fan is used to deliver the heat in the heating compartment into the cargo compartment through the second air inlet; the first air inlet is provided with a first air valve, and the second air inlet is provided with a second air valve; the method comprises: obtaining the actual temperature in the cargo compartment, The target temperature of the cargo warehouse, the amount of cold in the refrigerating warehouse, and the amount of heat in the heating warehouse; determine whether the cargo warehouse is in cooling mode or heating mode; if the cargo warehouse is in cooling mode, control the speed of the first fan according to the actual temperature, the target temperature, and the amount of cold in the refrigerating warehouse; and / or control the opening of the first air valve according to the actual temperature and the target temperature; if the cargo warehouse is in heating mode, control the speed of the second fan according to the actual temperature, the target temperature, and the amount of heat in the heating warehouse; and / or control the opening of the second air valve according to the actual temperature and the target temperature.

[0006] In some embodiments, if the cargo hold is in cooling mode, the opening of the second air valve is controlled to be a minimum opening; if the cargo hold is in heating mode, the opening of the first air valve is controlled to be a minimum opening.

[0007] In some embodiments, the speed of the first fan is controlled according to the actual temperature, the target temperature, and the cold capacity in the refrigeration warehouse, including: calculating the required cold capacity of the warehouse according to the actual temperature, the target temperature, and a preset first formula; recording the result of subtracting the required cold capacity from the cold capacity in the refrigeration warehouse as the cold capacity difference, and judging the size relationship between the cold capacity difference and the preset cold capacity threshold; if the cold capacity difference is greater than the preset cold capacity threshold, controlling the speed of the first fan to be the preset first speed; if the cold capacity difference is less than or equal to the preset cold capacity threshold, and the cold capacity in the refrigeration warehouse is greater than the required cold capacity, controlling the speed of the first fan to be the preset second speed; the preset first speed>the preset second speed; the preset first formula is:

[0008]

[0009] Among them, Q_l1 is the required cooling capacity of the warehouse; T_target_i is the target temperature; T_current_i is the actual temperature; Hc is the inner wall area of ​​the warehouse; N and i are parameters.

[0010] In some embodiments, the opening of the first air valve is controlled according to the actual temperature and the target temperature, including: recording the difference between the target temperature and the actual temperature as a first temperature difference; determining whether the first temperature difference is less than 0; if the first temperature difference is less than 0, increasing the opening of the first air valve by a preset first opening adjustment amount; if the first temperature difference is equal to 0, keeping the opening of the first air valve unchanged; if the first temperature difference is greater than 0, and the absolute value of the first temperature difference is greater than a preset temperature threshold, reducing the opening of the first air valve.

[0011] In some embodiments, the speed of the second fan is controlled according to the actual temperature, the target temperature, and the amount of heat in the heating bin, including: calculating the required heat of the cargo bin according to the actual temperature, the target temperature, and a preset second calculation formula; recording the result of subtracting the required heat from the heat in the heating bin as a heat difference, and determining the relationship between the heat difference and a preset heat threshold; if the heat difference is greater than the preset heat threshold, controlling the speed of the second fan to be a preset third speed; if the heat difference is less than or equal to the preset heat threshold, and the heat in the heating bin is greater than the required heat, controlling the speed of the second fan to be a preset fourth speed; the preset third speed>the preset fourth speed; the preset second formula is:

[0012]

[0013] Among them, Q_l2 is the required heat of the warehouse; T_target_i is the target temperature; T_current_i is the actual temperature; Hc is the inner wall area of ​​the warehouse; N and i are parameters.

[0014] In some embodiments, the opening of the second air valve is controlled according to the actual temperature and the target temperature, including: recording the difference between the target temperature and the actual temperature as a second temperature difference; determining whether the second temperature difference is greater than 0; if the second temperature difference is greater than 0, increasing the opening of the second air valve by a preset second opening adjustment amount; if the second temperature difference is equal to 0, keeping the opening of the second air valve unchanged; if the second temperature difference is less than 0, and the absolute value of the second temperature difference is greater than a preset temperature threshold, reducing the opening of the second air valve.

[0015] Matching the above method, the present invention provides a control device for a meal cabinet on the other hand, the meal cabinet includes a cargo compartment, a refrigeration compartment, and a heating compartment; the refrigeration compartment is provided with an evaporator and a first fan, and the heating compartment is provided with a condenser and a second fan; the cargo compartment includes a first air inlet and a second air inlet; the first fan is used to send the cold in the refrigeration compartment into the cargo compartment through the first air inlet; the second fan is used to send the heat in the heating compartment into the cargo compartment through the second air inlet; the first air inlet is provided with a first air valve, and the second air inlet is provided with a second air valve; the device includes: an acquisition unit, which is configured to acquire the actual temperature in the cargo compartment, the target temperature of the cargo compartment the target temperature, the cold amount in the refrigerating warehouse, and the heat amount in the heating warehouse; the control unit is configured to determine whether the cargo warehouse is in cooling mode or heating mode; the control unit is further configured to control the rotation speed of the first fan according to the actual temperature, the target temperature, and the cold amount in the refrigerating warehouse if the cargo warehouse is in cooling mode; and / or to control the opening of the first air valve according to the actual temperature and the target temperature; the control unit is further configured to control the rotation speed of the second fan according to the actual temperature, the target temperature, and the heat amount in the heating warehouse if the cargo warehouse is in heating mode; and / or to control the opening of the second air valve according to the actual temperature and the target temperature.

[0016] In some embodiments, the control unit is further configured to control the opening of the second air valve to be the minimum opening if the cargo hold is in cooling mode; and to control the opening of the first air valve to be the minimum opening if the cargo hold is in heating mode.

[0017] In some embodiments, the control unit controls the speed of the first fan according to the actual temperature, the target temperature, and the cold capacity in the refrigeration warehouse, including: calculating the required cold capacity of the cargo warehouse according to the actual temperature, the target temperature, and a preset first formula; recording the result of subtracting the required cold capacity from the cold capacity in the refrigeration warehouse as the cold capacity difference, and judging the size relationship between the cold capacity difference and the preset cold capacity threshold; if the cold capacity difference is greater than the preset cold capacity threshold, controlling the speed of the first fan to be the preset first speed; if the cold capacity difference is less than or equal to the preset cold capacity threshold, and the cold capacity in the refrigeration warehouse is greater than the required cold capacity, controlling the speed of the first fan to be the preset second speed; the preset first speed>the preset second speed; the preset first formula is:

[0018]

[0019] Among them, Q_l1 is the required cooling capacity of the warehouse; T_target_i is the target temperature; T_current_i is the actual temperature; Hc is the inner wall area of ​​the warehouse; N and i are parameters.

[0020] In some embodiments, the control unit controls the opening of the first air valve according to the actual temperature and the target temperature, including: recording the difference between the target temperature and the actual temperature as a first temperature difference; determining whether the first temperature difference is less than 0; if the first temperature difference is less than 0, increasing the opening of the first air valve by a preset first opening adjustment amount; if the first temperature difference is equal to 0, keeping the opening of the first air valve unchanged; if the first temperature difference is greater than 0, and the absolute value of the first temperature difference is greater than a preset temperature threshold, reducing the opening of the first air valve.

[0021] In some embodiments, the control unit controls the speed of the second fan according to the actual temperature, the target temperature, and the heat in the heating bin, including: calculating the required heat of the cargo bin according to the actual temperature, the target temperature, and a preset second calculation formula; recording the result of subtracting the required heat from the heat in the heating bin as a heat difference, and judging the relationship between the heat difference and a preset heat threshold; if the heat difference is greater than the preset heat threshold, controlling the speed of the second fan to be a preset third speed; if the heat difference is less than or equal to the preset heat threshold, and the heat in the heating bin is greater than the required heat, controlling the speed of the second fan to be a preset fourth speed; the preset third speed>the preset fourth speed; the preset second formula is:

[0022]

[0023] Among them, Q_l2 is the required heat of the warehouse; T_target_i is the target temperature; T_current_i is the actual temperature; Hc is the inner wall area of ​​the warehouse; N and i are parameters.

[0024] In some embodiments, the control unit controls the opening of the second air valve according to the actual temperature and the target temperature, including: recording the difference between the target temperature and the actual temperature as the second temperature difference; determining whether the second temperature difference is greater than 0; if the second temperature difference is greater than 0, increasing the opening of the second air valve by a preset second opening adjustment amount; if the second temperature difference is equal to 0, keeping the opening of the second air valve unchanged; if the second temperature difference is less than 0, and the absolute value of the second temperature difference is greater than a preset temperature threshold, reducing the opening of the second air valve.

[0025] Matching the above device, the present invention provides a meal cabinet on another aspect, including: the control device of the meal cabinet mentioned above.

[0026] Matching the above method, the present invention provides a storage medium on another aspect, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the control method of the dining cabinet described above.

[0027] Matching the above method, the present invention provides a computer program product on another aspect, wherein the computer program product includes a computer program, and when the computer program product is processed and executed, the steps of the above method for controlling the dining cabinet are implemented.

[0028] According to the scheme of the present invention, the meal cabinet includes a cargo warehouse, a refrigeration warehouse and a heating warehouse; an evaporator and a first fan are arranged at the refrigeration warehouse, and a condenser and a second fan are arranged at the heating warehouse; the first fan is used to send the cold in the refrigeration warehouse into the cargo warehouse through the first air inlet of the cargo warehouse; the second fan is used to send the heat in the heating warehouse into the cargo warehouse through the second air inlet of the cargo warehouse; a first air valve is arranged at the first air inlet, and a second air valve is arranged at the second air inlet; when the cargo warehouse is in the refrigeration mode, the rotation speed of the first fan is controlled according to the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse, and the cold in the refrigeration warehouse; and the opening of the first air valve is controlled according to the actual temperature and the target temperature of the cargo warehouse; when the cargo warehouse is in the heating mode, the rotation speed of the second fan is controlled according to the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse, and the heat in the heating warehouse; and the opening of the second air valve is controlled according to the actual temperature and the target temperature of the cargo warehouse. Therefore, by setting up a refrigeration bin and a heating bin to provide cooling and heating for the warehouse, and controlling the fan speed and the opening of the air valve at the same time, the temperature in the warehouse can be accurately controlled. This not only meets the refrigeration and heating needs of the food cabinet, but also improves the accuracy of the warehouse temperature control, improves the use efficiency of the food cabinet and the food quality of the food stored in the food cabinet.

[0029] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention.

[0030] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic flow chart of an embodiment of a method for controlling a dining cabinet of the present invention;

[0032] Figure 2 It is a structural schematic diagram of an embodiment of a control device for a dining cabinet of the present invention;

[0033] Figure 3It is a structural diagram of a dining cabinet of the present invention;

[0034] Figure 4 It is a flow chart of a method for controlling the operation mode of a meal cabinet of the present invention;

[0035] Figure 5 It is a schematic flow chart of a method for controlling the temperature of a cargo compartment of a meal cabinet according to the present invention.

[0036] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0037] 1-cargo compartment; 2-heating compartment; 3-refrigeration compartment; 4-condenser; 5-evaporator; 6-temperature sensor; 7-fan; 8-air supply duct; 9-exhaust duct; 102-acquisition unit; 104-control unit. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] According to an embodiment of the present invention, a control method for a meal cabinet is provided, wherein the meal cabinet comprises a cargo compartment, a refrigeration compartment, and a heating compartment; the cargo compartment is used to store food; an evaporator and a first fan are provided at the refrigeration compartment, and a condenser and a second fan are provided at the heating compartment; the cargo compartment comprises a first air inlet and a second air inlet; the first fan is used to deliver the cold in the refrigeration compartment into the cargo compartment through the first air inlet; the second fan is used to deliver the heat in the heating compartment into the cargo compartment through the second air inlet; a first air valve is provided at the first air inlet, and a second air valve is provided at the second air inlet.

[0040] The structure of the food cabinet is as follows Figure 3As shown, the internal space of the food cabinet is divided into a plurality of independent warehouses 1, and the warehouses 1 are independent of each other by physical division, forming a multi-dimensional storage space. Each warehouse 1 has an independent loading and access channel to ensure that the temperature in other warehouses 1 will not be affected during the storage and removal of food. Each warehouse 1 can be used as a cold storage warehouse 1 to store food that needs to be refrigerated, or as a hot storage warehouse 1 to store food that needs to be kept warm and heated. The inner and outer walls of the warehouse 1 are made of thermal insulation materials to ensure the temperature isolation between the warehouses 1. The thermal insulation materials include vacuum insulation panels, polyurethane foam materials, ceramic fibers, etc. A temperature sensor is provided in each warehouse 1 to detect the temperature in the warehouse 1.

[0041] The food cabinet also includes a heat pump system, which includes a compressor, an evaporator 5, a condenser 4, and a throttling device. The heat pump system can release cold and heat when it is in operation. The food cabinet is equipped with a separate heating chamber 2 for the condenser 4. After the condenser 4 exchanges heat with the air in the heating chamber 2, the heat is released into the heating chamber 2 and stored. The food cabinet is also equipped with a separate refrigeration chamber 3 for the evaporator 5. After the evaporator 5 exchanges heat with the air in the refrigeration chamber 3, the cold is released into the refrigeration chamber 3 and stored. Temperature sensors are provided in both the heating chamber 2 and the refrigeration chamber 3 to detect the temperature in each chamber.

[0042] Each cargo warehouse 1 has a separate first air inlet, a second air inlet, and an air outlet. The air outlet is located at the end of the air circulation path inside the cargo warehouse 1. A first air valve is provided at the first air inlet, a second air valve is provided at the second air inlet, and a third air valve is provided at the air outlet.

[0043] The first air inlet of each cargo compartment 1 is connected to the air outlet of the refrigerating compartment 3 through the air supply duct 8, and a fan 7 is provided at the air outlet of the refrigerating compartment 3. When the first air valve at the first air inlet is opened and the fan 7 at the air outlet of the refrigerating compartment 3 is running, the cold air in the refrigerating compartment 3 can flow into the cargo compartment 1 through the air supply duct 8 and the first air inlet, providing cooling for the cargo compartment 1.

[0044] The second air inlet of each cargo compartment 1 is connected to the exhaust port of the heating compartment 2 through the air supply duct 8, and a fan 7 is provided at the exhaust port of the heating compartment 2. When the second air valve at the second air inlet is opened and the fan 7 at the exhaust port of the heating compartment 2 is running, the hot air in the heating compartment 2 can flow into the cargo compartment 1 through the air supply duct 8 and the second air inlet, thereby increasing the heat of the cargo compartment 1. The air supply duct connected to the refrigeration compartment and the air supply duct connected to the heating compartment are independent of each other and are not connected to each other.

[0045] The exhaust port of each cargo hold 1 is connected to the exhaust duct 9 . When the third air valve at the exhaust port is opened, the air in the cargo hold 1 can be discharged through the exhaust port and the exhaust duct 9 .

[0046] The cargo hold 1 can be operated in heating mode or cooling mode. By controlling the opening and closing of the first air valve and the second air valve at the cargo hold 1, the cargo hold 1 can be switched between the heating mode and the cooling mode. For example, when the first air valve is opened and the second air valve is closed, the cargo hold 1 is operated in cooling mode; when the first air valve is closed and the second air valve is opened, the cargo hold 1 is operated in heating mode. In the heating mode, the heating hold 2 provides the required heat for the cargo hold 1; in the cooling mode, the cooling hold 3 provides the required cooling for the cargo hold 1. Thus, the meal cabinet can meet the needs of refrigerating or keeping food warm.

[0047] like Figure 1 The control method of the meal cabinet may include: step S110 to step S140.

[0048] In step S110, the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse, the cooling capacity in the refrigerating warehouse, and the heat capacity in the heating warehouse are obtained.

[0049] The target temperature of the cargo warehouse can be set by the user, or it can be matched to the corresponding target temperature according to the type of food stored in the cargo warehouse. The cooling capacity in the refrigeration warehouse and the heat capacity in the heating warehouse can be calculated by monitoring the operating parameters of the heat pump system, including the operating current of the compressor, the suction and exhaust pressure of the compressor, the refrigerant flow rate of the evaporator, the refrigerant flow rate of the condenser, etc.

[0050] In step S120, it is determined whether the cargo hold is in cooling mode or heating mode.

[0051] At step S130, if the cargo warehouse is in cooling mode, the speed of the first fan is controlled according to the actual temperature, the target temperature, and the amount of cooling in the refrigeration warehouse; and / or the opening of the first air valve is controlled according to the actual temperature and the target temperature.

[0052] In some embodiments, if the cargo hold is in cooling mode, the opening of the second air valve is controlled to be a minimum opening.

[0053] In some embodiments, in step S130, the specific process of controlling the rotation speed of the first fan according to the actual temperature, the target temperature, and the cooling capacity in the refrigeration compartment includes: steps S210 to S240.

[0054] Step S210, calculating the required cooling capacity of the warehouse according to the actual temperature, the target temperature, and a preset first formula. The preset first formula is:

[0055]

[0056] Among them, Q_l1 is the required cooling capacity of the warehouse; T_target_i is the target temperature; T_current_i is the actual temperature; Hc is the inner wall area of ​​the warehouse; N and i are parameters.

[0057] Step S220, recording the result of subtracting the required cooling capacity from the cooling capacity in the refrigeration bin as a cooling capacity difference, and determining the magnitude relationship between the cooling capacity difference and a preset cooling capacity threshold.

[0058] Step S230: If the cooling capacity difference is greater than a preset cooling capacity threshold, the rotation speed of the first fan is controlled to be a preset first rotation speed.

[0059] Step S240, if the cooling capacity difference is less than or equal to the preset cooling capacity threshold, and the cooling capacity in the refrigeration compartment is greater than the required cooling capacity, the speed of the first fan is controlled to be a preset second speed; the preset first speed>the preset second speed.

[0060] The preset cooling capacity threshold is a positive value, which is used to determine whether the cooling capacity in the refrigeration warehouse is sufficient. Since the refrigeration warehouse may need to provide cooling capacity for multiple warehouses at the same time, it is necessary to control the speed of the first fan in combination with the cooling capacity in the refrigeration warehouse to ensure that the temperature in each warehouse reaches the target temperature as much as possible. When the cooling capacity difference value is greater than the preset cooling capacity threshold value, it means that the cooling capacity in the refrigeration warehouse is sufficient to meet the refrigeration demand of the warehouse. In order to quickly reduce the temperature in the warehouse to the target temperature, the fan in the refrigeration warehouse is controlled to run at a larger preset first speed to increase the air circulation speed, input more cooling capacity into the warehouse, and increase the cooling rate. If the cooling capacity difference value is less than or equal to the preset cooling capacity threshold value, and the cooling capacity in the refrigeration warehouse is greater than the required cooling capacity, the fan in the refrigeration warehouse is controlled to run at a smaller preset second speed to reduce energy consumption and keep the temperature in the warehouse within a certain range. If the cooling capacity in the refrigeration warehouse is less than or equal to the required cooling capacity, it means that the temperature inside the warehouse cannot reach the target temperature, and it is considered that there is insufficient cooling in the refrigeration warehouse. At this time, the system issues an early warning prompt.

[0061] Optionally, the user may directly set the speed of the first fan to a preset first speed or a preset second speed. If the user does not set it, the speed of the first fan is controlled according to the actual temperature, the target temperature, and the cooling capacity in the refrigeration compartment.

[0062] In some implementations, in step S130, the specific process of controlling the opening of the first air valve according to the actual temperature and the target temperature includes: steps S310 to S350.

[0063] Step S310: Record the difference between the target temperature and the actual temperature as a first temperature difference.

[0064] Step S320, determining whether the first temperature difference is less than 0.

[0065] Step S330: if the first temperature difference is less than 0, increase the opening of the first air valve by a preset first opening adjustment amount.

[0066] The preset first opening adjustment amount is determined by calculating the first temperature difference, and the calculation formula is:

[0067] ΔD_i1=Kp*ΔT_1+Ki*∫ΔT_1dt+Kd*d(ΔT_1) / dt;

[0068] Among them, ΔD_i1 is the preset first opening adjustment amount; ΔT_1 is the first temperature difference; Kp is the proportional gain; Ki is the integral gain; and Kd is the differential gain.

[0069] Step S340: if the first temperature difference is equal to 0, the opening of the first air valve is kept unchanged.

[0070] Step S350: if the first temperature difference is greater than 0, and the absolute value of the first temperature difference is greater than a preset temperature threshold, then reducing the opening of the first air valve.

[0071] When the temperature in the cargo warehouse is higher than the target temperature, the first temperature difference is less than 0. At this time, the cargo warehouse needs to obtain more cold air from the refrigeration warehouse, so the opening of the first air valve is increased to make the temperature in the cargo warehouse reach the target temperature. When the temperature in the cargo warehouse is equal to the target temperature, the first temperature difference = 0. At this time, the first air valve can maintain the current opening. Then, the opening of the first air valve is fine-tuned through dynamic feedback to keep the temperature in the cargo warehouse near the target temperature. The preset temperature threshold is the temperature error. The opening of the first air valve is fine-tuned to ensure that the absolute value of the temperature difference is within the preset temperature threshold. When the first temperature difference is greater than 0, and the absolute value of the first temperature difference is greater than the preset temperature threshold, the temperature in the cargo warehouse is too low, and the opening of the first air valve needs to be reduced to increase the temperature in the cargo warehouse. If the opening value after increasing the opening of the first air valve exceeds the maximum opening of the first air valve, the opening of the first air valve is controlled to be the maximum opening.

[0072] At step S140, if the cargo warehouse is in heating mode, the speed of the second fan is controlled according to the actual temperature, the target temperature, and the heat in the heating warehouse; and / or the opening of the second air valve is controlled according to the actual temperature and the target temperature.

[0073] In some embodiments, if the cargo hold is in a heating mode, the opening of the first air valve is controlled to be a minimum opening.

[0074] In cooling mode, the refrigeration warehouse provides cooling for the cargo warehouse. At this time, the opening of the second air valve is the minimum opening, or the second air valve is closed to prevent the heat released by the heating warehouse from affecting the cooling efficiency of the cargo warehouse. The initial opening of the first air valve is the preset minimum opening. In heating mode, the heating warehouse provides heat for the cargo warehouse. At this time, the opening of the first air valve is the minimum opening, or the first air valve is closed to prevent the heat released by the heating warehouse from affecting the insulation effect of the cargo warehouse. The initial opening of the second air valve is the preset minimum opening. By controlling the speed of the fan and the opening of the air valve, the temperature in the cargo warehouse reaches the target temperature, which improves the accuracy of temperature control.

[0075] In some embodiments, in step S140, the specific process of controlling the rotation speed of the second fan according to the actual temperature, the target temperature, and the amount of heat in the heating chamber includes: steps S410 to S440.

[0076] Step S410, calculating the required heat of the warehouse according to the actual temperature, the target temperature, and a preset second calculation formula. The preset second formula is:

[0077]

[0078] Among them, Q_l2 is the required heat of the warehouse; T_target_i is the target temperature; T_current_i is the actual temperature; Hc is the inner wall area of ​​the warehouse; N and i are parameters.

[0079] Step S420, the result of subtracting the required heat from the heat in the heating chamber is recorded as a heat difference, and the relationship between the heat difference and a preset heat threshold is determined.

[0080] Step S430: If the heat difference is greater than a preset heat threshold, the rotation speed of the second fan is controlled to be a preset third rotation speed.

[0081] Step S440, if the heat difference is less than or equal to the preset heat threshold, and the heat in the heating chamber is greater than the required heat, the speed of the second fan is controlled to be a preset fourth speed; the preset third speed>the preset fourth speed.

[0082] The preset heat threshold is a positive value, which is used to determine whether the cold capacity in the refrigeration warehouse is sufficient. Since the heating warehouse may need to provide heat for multiple warehouses at the same time, it is necessary to control the speed of the second fan in combination with the cold capacity in the heating warehouse to ensure that the temperature in each warehouse reaches the target temperature as much as possible. When the heat difference value is greater than the preset heat threshold value, it means that the heat in the heating warehouse is sufficient to meet the heating demand of the warehouse. In order to quickly raise the temperature in the warehouse to the target temperature, the fan in the heating warehouse is controlled to run at a larger preset third speed to increase the air circulation speed, input more heat into the warehouse, and increase the heating rate. If the heat difference value is less than the preset heat threshold value, and the heat in the heating warehouse is greater than the required heat, the fan in the heating warehouse is controlled to run at a smaller preset fourth speed to reduce energy consumption and keep the temperature in the warehouse within a certain range. If the heat in the heating warehouse is less than the required heat, it means that the temperature inside the warehouse cannot reach the target temperature, and it is considered that there is insufficient heat in the heating warehouse. At this time, the system issues an early warning prompt.

[0083] Figure 4 FIG. 1 is a flow chart of a method for controlling the operating mode of a meal cabinet of the present invention, as shown in FIG. Figure 4 As shown, including:

[0084] Step 1, calculate the refrigeration / heating capacity Qc of the refrigeration / heating warehouse and the required cold / heating capacity Ql of the cargo warehouse, ΔQ=Qc-Ql. Determine whether ΔQ>0. If ΔQ≤0, it is considered that the refrigeration / heating capacity of the food cabinet is insufficient and cannot meet the demand, and an early warning prompt is issued at this time. If ΔQ>0, determine whether the user has set the operating mode. If the user sets the operating mode to the fast mode, increase the fan speed, increase the air circulation speed, and make the cargo warehouse temperature quickly reach the target temperature; if the user sets the operating mode to the energy-saving mode, control the fan to run at a lower speed to reduce energy consumption and keep the temperature in the cargo warehouse within a certain range; if the user sets the automatic mode or does not set the operating mode, execute step 2.

[0085] Step 2, determine whether ΔQ>threshold ΔQ'. If ΔQ>ΔQ', run in fast mode; if ΔQ≤ΔQ', run in energy-saving mode.

[0086] In some implementations, in step S140, the specific process of controlling the opening of the second air valve according to the actual temperature and the target temperature includes: steps S510 to S550.

[0087] Step S510: Record the difference between the target temperature and the actual temperature as a second temperature difference.

[0088] Step S520, determining whether the second temperature difference is greater than 0.

[0089] Step S530: if the second temperature difference is greater than 0, increasing the opening of the second air valve by a preset second opening adjustment amount.

[0090] The preset second opening adjustment amount is determined by calculating the second temperature difference, and the calculation formula is:

[0091] ΔD_i2=Kp*ΔT_2+Ki*∫ΔT_2dt+Kd*d(ΔT_2) / dt;

[0092] Among them, ΔD_i2 is the preset second opening adjustment amount; ΔT_2 is the second temperature difference; Kp is the proportional gain; Ki is the integral gain; and Kd is the differential gain.

[0093] Step S540: if the second temperature difference is equal to 0, the opening of the second air valve is kept unchanged.

[0094] Step S550: if the second temperature difference is less than 0, and the absolute value of the second temperature difference is greater than a preset temperature threshold, then reducing the opening of the second air valve.

[0095] When the temperature in the cargo warehouse is lower than the target temperature, the second temperature difference is greater than 0. At this time, the cargo warehouse needs to obtain more heat from the heating warehouse, so the opening of the second air valve is increased to make the temperature in the cargo warehouse reach the target temperature. When the temperature in the cargo warehouse is equal to the target temperature, the second temperature difference is 0. At this time, the second air valve can maintain the current opening. Then, the opening of the second air valve is fine-tuned through dynamic feedback to keep the temperature in the cargo warehouse near the target temperature. The preset temperature threshold is the temperature error. The opening of the second air valve is fine-tuned to ensure that the absolute value of the second temperature difference is within the preset temperature threshold. When the second temperature difference is less than 0, and the absolute value of the second temperature difference is greater than the preset temperature threshold, the temperature in the cargo warehouse is too high, and the opening of the second air valve needs to be reduced to lower the temperature in the cargo warehouse. If the opening value after increasing the opening of the second air valve exceeds the maximum opening of the second air valve, the opening of the second air valve is controlled to be the maximum opening.

[0096] Figure 5 FIG. 1 is a flow chart of a method for controlling the temperature of a cargo compartment of a meal cabinet of the present invention. Figure 5 As shown, including:

[0097] Step 11, the user initializes and sets the parameters of the meal cabinet, including the types of food stored in each bin, the operation mode of the bin, control parameters, etc. The system determines the target temperature of the bin according to the type of food.

[0098] Step 12, obtain the temperature in the warehouse, calculate the difference ΔT between the target temperature and the temperature in the warehouse, and determine the opening adjustment amount ΔD of the air valve according to ΔT. In cooling mode, if ΔT<0, increase the opening of the first air valve by ΔD; in heating mode, if ΔT>0, increase the opening of the second air valve by ΔD. If |ΔT|>threshold ε, then re-execute step 12; if |ΔT|≤threshold ε, enter the steady-state control stage, and maintain |ΔT|≤threshold ε by fine-tuning the opening of the air valve.

[0099] According to the technical solution of this embodiment, the meal cabinet includes a cargo warehouse, a refrigeration warehouse and a heating warehouse; an evaporator and a first fan are provided at the refrigeration warehouse, and a condenser and a second fan are provided at the heating warehouse; the first fan is used to send the cold in the refrigeration warehouse into the cargo warehouse through the first air inlet of the cargo warehouse; the second fan is used to send the heat in the heating warehouse into the cargo warehouse through the second air inlet of the cargo warehouse; a first air valve is provided at the first air inlet, and a second air valve is provided at the second air inlet; when the cargo warehouse is in the refrigeration mode, the speed of the first fan is controlled according to the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse and the cold in the refrigeration warehouse; and the opening of the first air valve is controlled according to the actual temperature and the target temperature of the cargo warehouse; when the cargo warehouse is in the heating mode, the speed of the second fan is controlled according to the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse and the heat in the heating warehouse; and the opening of the second air valve is controlled according to the actual temperature and the target temperature of the cargo warehouse. Therefore, by setting up a refrigeration bin and a heating bin to provide cooling and heating for the warehouse, and controlling the fan speed and the opening of the air valve at the same time, the temperature in the warehouse can be accurately controlled. This not only meets the refrigeration and heating needs of the food cabinet, but also improves the accuracy of the warehouse temperature control, improves the use efficiency of the food cabinet and the food quality of the food stored in the food cabinet.

[0100] According to an embodiment of the present invention, a control device for a meal cabinet corresponding to the control method of the meal cabinet is also provided. The meal cabinet comprises a cargo compartment, a refrigeration compartment, and a heating compartment; the cargo compartment is used to store food; an evaporator and a first fan are provided at the refrigeration compartment, and a condenser and a second fan are provided at the heating compartment; the cargo compartment comprises a first air inlet and a second air inlet; the first fan is used to send the cold in the refrigeration compartment into the cargo compartment through the first air inlet; the second fan is used to send the heat in the heating compartment into the cargo compartment through the second air inlet; a first air valve is provided at the first air inlet, and a second air valve is provided at the second air inlet.

[0101] The structure of the food cabinet is as follows Figure 3As shown, the internal space of the food cabinet is divided into a plurality of independent warehouses 1, and the warehouses 1 are independent of each other by physical division, forming a multi-dimensional storage space. Each warehouse 1 has an independent loading and access channel to ensure that the temperature in other warehouses 1 will not be affected during the storage and removal of food. Each warehouse 1 can be used as a cold storage warehouse 1 to store food that needs to be refrigerated, or as a hot storage warehouse 1 to store food that needs to be kept warm and heated. The inner and outer walls of the warehouse 1 are made of thermal insulation materials to ensure the temperature isolation between the warehouses 1. The thermal insulation materials include vacuum insulation panels, polyurethane foam materials, ceramic fibers, etc. A temperature sensor is provided in each warehouse 1 to detect the temperature in the warehouse 1.

[0102] The food cabinet also includes a heat pump system, which includes a compressor, an evaporator 5, a condenser 4, and a throttling device. The heat pump system can release cold and heat when it is in operation. The food cabinet is equipped with a separate heating chamber 2 for the condenser 4. After the condenser 4 exchanges heat with the air in the heating chamber 2, the heat is released into the heating chamber 2 and stored. The food cabinet is also equipped with a separate refrigeration chamber 3 for the evaporator 5. After the evaporator 5 exchanges heat with the air in the refrigeration chamber 3, the cold is released into the refrigeration chamber 3 and stored. Temperature sensors are provided in both the heating chamber 2 and the refrigeration chamber 3 to detect the temperature in each chamber.

[0103] Each cargo warehouse 1 has a separate first air inlet, a second air inlet, and an air outlet. The air outlet is located at the end of the air circulation path inside the cargo warehouse 1. A first air valve is provided at the first air inlet, a second air valve is provided at the second air inlet, and a third air valve is provided at the air outlet.

[0104] The first air inlet of each cargo compartment 1 is connected to the air outlet of the refrigerating compartment 3 through the air supply duct 8, and a fan 7 is provided at the air outlet of the refrigerating compartment 3. When the first air valve at the first air inlet is opened and the fan 7 at the air outlet of the refrigerating compartment 3 is running, the cold air in the refrigerating compartment 3 can flow into the cargo compartment 1 through the air supply duct 8 and the first air inlet, providing cooling for the cargo compartment 1.

[0105] The second air inlet of each cargo compartment 1 is connected to the exhaust port of the heating compartment 2 through the air supply duct 8, and a fan 7 is provided at the exhaust port of the heating compartment 2. When the second air valve at the second air inlet is opened and the fan 7 at the exhaust port of the heating compartment 2 is running, the hot air in the heating compartment 2 can flow into the cargo compartment 1 through the air supply duct 8 and the second air inlet, thereby increasing the heat of the cargo compartment 1. The air supply duct connected to the refrigeration compartment and the air supply duct connected to the heating compartment are independent of each other and are not connected to each other.

[0106] The exhaust port of each cargo hold 1 is connected to the exhaust duct 9 . When the third air valve at the exhaust port is opened, the air in the cargo hold 1 can be discharged through the exhaust port and the exhaust duct 9 .

[0107] The cargo hold 1 can be operated in heating mode or cooling mode. By controlling the opening and closing of the first air valve and the second air valve at the cargo hold 1, the cargo hold 1 can be switched between the heating mode and the cooling mode. For example, when the first air valve is opened and the second air valve is closed, the cargo hold 1 is operated in cooling mode; when the first air valve is closed and the second air valve is opened, the cargo hold 1 is operated in heating mode. In the heating mode, the heating hold 2 provides the required heat for the cargo hold 1; in the cooling mode, the cooling hold 3 provides the required cooling for the cargo hold 1. Thus, the meal cabinet can meet the needs of refrigerating or keeping food warm.

[0108] See also Figure 2 The control device of the meal cabinet may include: an acquisition unit 102 and a control unit 104 .

[0109] The acquisition unit 102 is configured to acquire the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse, the cooling capacity in the refrigeration warehouse, and the heat capacity in the heating warehouse.

[0110] The target temperature of the cargo warehouse can be set by the user, or it can be matched to the corresponding target temperature according to the type of food stored in the cargo warehouse. The cooling capacity in the refrigeration warehouse and the heat capacity in the heating warehouse can be calculated by monitoring the operating parameters of the heat pump system, including the operating current of the compressor, the suction and exhaust pressure of the compressor, the refrigerant flow rate of the evaporator, the refrigerant flow rate of the condenser, etc.

[0111] The control unit 104 is configured to determine whether the cargo hold is in a cooling mode or a heating mode.

[0112] The control unit 104 is further configured to control the speed of the first fan according to the actual temperature, the target temperature, and the amount of cold in the refrigeration warehouse if the warehouse is in a refrigeration mode; and / or to control the opening of the first air valve according to the actual temperature and the target temperature.

[0113] In some embodiments, the control unit 104 is further configured to control the opening of the second air valve to be the minimum opening if the cargo hold is in a cooling mode.

[0114] In some embodiments, the control unit 104 controls the speed of the first fan according to the actual temperature, the target temperature, and the cooling capacity in the refrigeration bin, including:

[0115] The control unit 104 is further configured to calculate the required cooling capacity of the warehouse according to the actual temperature, the target temperature, and a preset first formula. The preset first formula is:

[0116]

[0117] Among them, Q_l1 is the required cooling capacity of the warehouse; T_target_i is the target temperature; T_current_i is the actual temperature; Hc is the inner wall area of ​​the warehouse; N and i are parameters.

[0118] The control unit 104 is further configured to record the result of subtracting the required cooling capacity from the cooling capacity in the refrigeration bin as a cooling capacity difference, and determine the magnitude relationship between the cooling capacity difference and a preset cooling capacity threshold.

[0119] The control unit 104 is further specifically configured to control the rotation speed of the first fan to a preset first rotation speed if the cooling capacity difference is greater than a preset cooling capacity threshold.

[0120] The control unit 104 is further specifically configured to control the speed of the first fan to a preset second speed if the cooling capacity difference is less than or equal to a preset cooling capacity threshold and the cooling capacity in the refrigeration compartment is greater than the required cooling capacity; the preset first speed > the preset second speed.

[0121] The preset cooling capacity threshold is a positive value, which is used to determine whether the cooling capacity in the refrigeration warehouse is sufficient. Since the refrigeration warehouse may need to provide cooling capacity for multiple warehouses at the same time, it is necessary to control the speed of the first fan in combination with the cooling capacity in the refrigeration warehouse to ensure that the temperature in each warehouse reaches the target temperature as much as possible. When the cooling capacity difference value is greater than the preset cooling capacity threshold value, it means that the cooling capacity in the refrigeration warehouse is sufficient to meet the refrigeration demand of the warehouse. In order to quickly reduce the temperature in the warehouse to the target temperature, the fan in the refrigeration warehouse is controlled to run at a larger preset first speed to increase the air circulation speed, input more cooling capacity into the warehouse, and increase the cooling rate. If the cooling capacity difference value is less than or equal to the preset cooling capacity threshold value, and the cooling capacity in the refrigeration warehouse is greater than the required cooling capacity, the fan in the refrigeration warehouse is controlled to run at a smaller preset second speed to reduce energy consumption and keep the temperature in the warehouse within a certain range. If the cooling capacity in the refrigeration warehouse is less than or equal to the required cooling capacity, it means that the temperature inside the warehouse cannot reach the target temperature, and it is considered that there is insufficient cooling in the refrigeration warehouse. At this time, the system issues an early warning prompt.

[0122] Optionally, the user may directly set the speed of the first fan to a preset first speed or a preset second speed. If the user does not set it, the speed of the first fan is controlled according to the actual temperature, the target temperature, and the cooling capacity in the refrigeration compartment.

[0123] In some implementations, the control unit 104 controls the opening of the first air valve according to the actual temperature and the target temperature, including:

[0124] The control unit 104 is further specifically configured to record a difference value obtained by subtracting the actual temperature from the target temperature as a first temperature difference value.

[0125] The control unit 104 is further configured to determine whether the first temperature difference is less than 0.

[0126] The control unit 104 is further specifically configured to increase the opening of the first air valve by a preset first opening adjustment amount if the first temperature difference is less than 0.

[0127] The preset first opening adjustment amount is determined by calculating the first temperature difference, and the calculation formula is:

[0128] ΔD_i1=Kp*ΔT_1+Ki*∫ΔT_1dt+Kd*d(ΔT_1) / dt;

[0129] Among them, ΔD_i1 is the preset first opening adjustment amount; ΔT_1 is the first temperature difference; Kp is the proportional gain; Ki is the integral gain; and Kd is the differential gain.

[0130] The control unit 104 is further specifically configured to keep the opening of the first air valve unchanged if the first temperature difference is equal to 0.

[0131] The control unit 104 is further specifically configured to reduce the opening of the first air valve if the first temperature difference is greater than 0 and the absolute value of the first temperature difference is greater than a preset temperature threshold.

[0132] When the temperature in the cargo warehouse is higher than the target temperature, the first temperature difference is less than 0. At this time, the cargo warehouse needs to obtain more cold air from the refrigeration warehouse, so the opening of the first air valve is increased to make the temperature in the cargo warehouse reach the target temperature. When the temperature in the cargo warehouse is equal to the target temperature, the first temperature difference = 0. At this time, the first air valve can maintain the current opening. Then, the opening of the first air valve is fine-tuned through dynamic feedback to keep the temperature in the cargo warehouse near the target temperature. The preset temperature threshold is the temperature error. The opening of the first air valve is fine-tuned to ensure that the absolute value of the temperature difference is within the preset temperature threshold. When the first temperature difference is greater than 0, and the absolute value of the first temperature difference is greater than the preset temperature threshold, the temperature in the cargo warehouse is too low, and the opening of the first air valve needs to be reduced to increase the temperature in the cargo warehouse. If the opening value after increasing the opening of the first air valve exceeds the maximum opening of the first air valve, the opening of the first air valve is controlled to be the maximum opening.

[0133] The control unit 104 is further configured to control the speed of the second fan according to the actual temperature, the target temperature, and the heat in the heating warehouse if the warehouse is in heating mode; and / or control the opening of the second air valve according to the actual temperature and the target temperature.

[0134] In some embodiments, the control unit 104 is further configured to control the opening of the first air valve to be the minimum opening if the cargo hold is in a heating mode.

[0135] In cooling mode, the refrigeration warehouse provides cooling for the cargo warehouse. At this time, the opening of the second air valve is the minimum opening, or the second air valve is closed to prevent the heat released by the heating warehouse from affecting the cooling efficiency of the cargo warehouse. The initial opening of the first air valve is the preset minimum opening. In heating mode, the heating warehouse provides heat for the cargo warehouse. At this time, the opening of the first air valve is the minimum opening, or the first air valve is closed to prevent the heat released by the heating warehouse from affecting the insulation effect of the cargo warehouse. The initial opening of the second air valve is the preset minimum opening. By controlling the speed of the fan and the opening of the air valve, the temperature in the cargo warehouse reaches the target temperature, which improves the accuracy of temperature control.

[0136] In some embodiments, the control unit 104 controls the speed of the second fan according to the actual temperature, the target temperature, and the amount of heat in the heating chamber, including:

[0137] The control unit 104 is further configured to calculate the required heat of the cargo warehouse according to the actual temperature, the target temperature, and a preset second calculation formula. The preset second formula is:

[0138]

[0139] Among them, Q_l2 is the required heat of the warehouse; T_target_i is the target temperature; T_current_i is the actual temperature; Hc is the inner wall area of ​​the warehouse; N and i are parameters.

[0140] The control unit 104 is further specifically configured to record the result of subtracting the required heat from the heat in the heating chamber as a heat difference, and determine the relationship between the heat difference and a preset heat threshold.

[0141] The control unit 104 is further specifically configured to control the rotation speed of the second fan to a preset third rotation speed if the heat difference is greater than a preset heat threshold.

[0142] The control unit 104 is further specifically configured to control the speed of the second fan to a preset fourth speed if the heat difference is less than or equal to a preset heat threshold and the heat in the heating chamber is greater than the required heat; the preset third speed>the preset fourth speed.

[0143] The preset heat threshold is a positive value, which is used to determine whether the cold capacity in the refrigeration warehouse is sufficient. Since the heating warehouse may need to provide heat for multiple warehouses at the same time, it is necessary to control the speed of the second fan in combination with the cold capacity in the heating warehouse to ensure that the temperature in each warehouse reaches the target temperature as much as possible. When the heat difference value is greater than the preset heat threshold value, it means that the heat in the heating warehouse is sufficient to meet the heating demand of the warehouse. In order to quickly raise the temperature in the warehouse to the target temperature, the fan in the heating warehouse is controlled to run at a larger preset third speed to increase the air circulation speed, input more heat into the warehouse, and increase the heating rate. If the heat difference value is less than the preset heat threshold value, and the heat in the heating warehouse is greater than the required heat, the fan in the heating warehouse is controlled to run at a smaller preset fourth speed to reduce energy consumption and keep the temperature in the warehouse within a certain range. If the heat in the heating warehouse is less than the required heat, it means that the temperature inside the warehouse cannot reach the target temperature, and it is considered that there is insufficient heat in the heating warehouse. At this time, the system issues an early warning prompt.

[0144] Figure 4 FIG. 1 is a flow chart of a method for controlling the operating mode of a meal cabinet of the present invention, as shown in FIG. Figure 4 As shown, including:

[0145] Step 1, calculate the refrigeration / heating capacity Qc of the refrigeration / heating warehouse and the required cold / heating capacity Ql of the cargo warehouse, ΔQ=Qc-Ql. Determine whether ΔQ>0. If ΔQ≤0, it is considered that the refrigeration / heating capacity of the food cabinet is insufficient and cannot meet the demand, and an early warning prompt is issued at this time. If ΔQ>0, determine whether the user has set the operating mode. If the user sets the operating mode to the fast mode, increase the fan speed, increase the air circulation speed, and make the cargo warehouse temperature quickly reach the target temperature; if the user sets the operating mode to the energy-saving mode, control the fan to run at a lower speed to reduce energy consumption and keep the temperature in the cargo warehouse within a certain range; if the user sets the automatic mode or does not set the operating mode, execute step 2.

[0146] Step 2, determine whether ΔQ>threshold ΔQ'. If ΔQ>ΔQ', run in fast mode; if ΔQ≤ΔQ', run in energy-saving mode.

[0147] In some implementations, the control unit 104 controls the opening of the second air valve according to the actual temperature and the target temperature, including:

[0148] The control unit 104 is further specifically configured to record a difference value obtained by subtracting the actual temperature from the target temperature as a second temperature difference value.

[0149] The control unit 104 is further configured to determine whether the second temperature difference is greater than zero.

[0150] The control unit 104 is further specifically configured to increase the opening of the second air valve by a preset second opening adjustment amount if the second temperature difference is greater than 0.

[0151] The preset second opening adjustment amount is determined by calculating the second temperature difference, and the calculation formula is:

[0152] ΔD_i2=Kp*ΔT_2+Ki*∫ΔT_2dt+Kd*d(ΔT_2) / dt;

[0153] Among them, ΔD_i2 is the preset second opening adjustment amount; ΔT_2 is the second temperature difference; Kp is the proportional gain; Ki is the integral gain; and Kd is the differential gain.

[0154] The control unit 104 is further specifically configured to keep the opening of the second air valve unchanged if the second temperature difference is equal to 0.

[0155] The control unit 104 is further specifically configured to reduce the opening of the second air valve if the second temperature difference is less than 0 and the absolute value of the second temperature difference is greater than a preset temperature threshold.

[0156] When the temperature in the cargo warehouse is lower than the target temperature, the second temperature difference is greater than 0. At this time, the cargo warehouse needs to obtain more heat from the heating warehouse, so the opening of the second air valve is increased to make the temperature in the cargo warehouse reach the target temperature. When the temperature in the cargo warehouse is equal to the target temperature, the second temperature difference is 0. At this time, the second air valve can maintain the current opening. Then, the opening of the second air valve is fine-tuned through dynamic feedback to keep the temperature in the cargo warehouse near the target temperature. The preset temperature threshold is the temperature error. The opening of the second air valve is fine-tuned to ensure that the absolute value of the second temperature difference is within the preset temperature threshold. When the second temperature difference is less than 0, and the absolute value of the second temperature difference is greater than the preset temperature threshold, the temperature in the cargo warehouse is too high, and the opening of the second air valve needs to be reduced to lower the temperature in the cargo warehouse. If the opening value after increasing the opening of the second air valve exceeds the maximum opening of the second air valve, the opening of the second air valve is controlled to be the maximum opening.

[0157] Figure 5 FIG. 1 is a flow chart of a method for controlling the temperature of a cargo compartment of a meal cabinet of the present invention. Figure 5 As shown, including:

[0158] Step 11, the user initializes and sets the parameters of the meal cabinet, including the types of food stored in each bin, the operation mode of the bin, control parameters, etc. The system determines the target temperature of the bin according to the type of food.

[0159] Step 12, obtain the temperature in the warehouse, calculate the difference ΔT between the target temperature and the temperature in the warehouse, and determine the opening adjustment amount ΔD of the air valve according to ΔT. In cooling mode, if ΔT<0, increase the opening of the first air valve by ΔD; in heating mode, if ΔT>0, increase the opening of the second air valve by ΔD. If |ΔT|>threshold ε, then re-execute step 12; if |ΔT|≤threshold ε, enter the steady-state control stage, and maintain |ΔT|≤threshold ε by fine-tuning the opening of the air valve.

[0160] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0161] According to the technical solution of the present invention, the meal cabinet includes a cargo warehouse, a refrigeration warehouse and a heating warehouse; an evaporator and a first fan are provided at the refrigeration warehouse, and a condenser and a second fan are provided at the heating warehouse; the first fan is used to send the cold in the refrigeration warehouse into the cargo warehouse through the first air inlet of the cargo warehouse; the second fan is used to send the heat in the heating warehouse into the cargo warehouse through the second air inlet of the cargo warehouse; a first air valve is provided at the first air inlet, and a second air valve is provided at the second air inlet; when the cargo warehouse is in the refrigeration mode, the rotation speed of the first fan is controlled according to the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse and the cold in the refrigeration warehouse; and the opening of the first air valve is controlled according to the actual temperature and the target temperature of the cargo warehouse; when the cargo warehouse is in the heating mode, the rotation speed of the second fan is controlled according to the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse and the heat in the heating warehouse; and the opening of the second air valve is controlled according to the actual temperature and the target temperature of the cargo warehouse. Therefore, by setting up a refrigeration bin and a heating bin to provide cooling and heating for the warehouse, and controlling the fan speed and the opening of the air valve at the same time, the temperature in the warehouse can be accurately controlled. This not only meets the refrigeration and heating needs of the food cabinet, but also improves the accuracy of the warehouse temperature control, improves the use efficiency of the food cabinet and the food quality of the food stored in the food cabinet.

[0162] According to an embodiment of the present invention, a meal cabinet corresponding to the control device of the meal cabinet is also provided. The meal cabinet may include: the control device of the meal cabinet described above.

[0163] Since the processing and functions implemented by the dining cabinet of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned device, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0164] According to the technical solution of the present invention, the meal cabinet includes a cargo warehouse, a refrigeration warehouse and a heating warehouse; an evaporator and a first fan are provided at the refrigeration warehouse, and a condenser and a second fan are provided at the heating warehouse; the first fan is used to send the cold in the refrigeration warehouse into the cargo warehouse through the first air inlet of the cargo warehouse; the second fan is used to send the heat in the heating warehouse into the cargo warehouse through the second air inlet of the cargo warehouse; a first air valve is provided at the first air inlet, and a second air valve is provided at the second air inlet; when the cargo warehouse is in the refrigeration mode, the rotation speed of the first fan is controlled according to the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse and the cold in the refrigeration warehouse; and the opening of the first air valve is controlled according to the actual temperature and the target temperature of the cargo warehouse; when the cargo warehouse is in the heating mode, the rotation speed of the second fan is controlled according to the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse and the heat in the heating warehouse; and the opening of the second air valve is controlled according to the actual temperature and the target temperature of the cargo warehouse. Therefore, by setting up a refrigeration bin and a heating bin to provide cooling and heating for the warehouse, and controlling the fan speed and the opening of the air valve at the same time, the temperature in the warehouse can be accurately controlled. This not only meets the refrigeration and heating needs of the food cabinet, but also improves the accuracy of the warehouse temperature control, improves the use efficiency of the food cabinet and the food quality of the food stored in the food cabinet.

[0165] According to an embodiment of the present invention, a storage medium corresponding to the control method of the dining cabinet is also provided, the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the control method of the dining cabinet described above.

[0166] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0167] According to the technical solution of the present invention, the meal cabinet includes a cargo warehouse, a refrigeration warehouse and a heating warehouse; an evaporator and a first fan are provided at the refrigeration warehouse, and a condenser and a second fan are provided at the heating warehouse; the first fan is used to send the cold in the refrigeration warehouse into the cargo warehouse through the first air inlet of the cargo warehouse; the second fan is used to send the heat in the heating warehouse into the cargo warehouse through the second air inlet of the cargo warehouse; a first air valve is provided at the first air inlet, and a second air valve is provided at the second air inlet; when the cargo warehouse is in the refrigeration mode, the rotation speed of the first fan is controlled according to the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse and the cold in the refrigeration warehouse; and the opening of the first air valve is controlled according to the actual temperature and the target temperature of the cargo warehouse; when the cargo warehouse is in the heating mode, the rotation speed of the second fan is controlled according to the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse and the heat in the heating warehouse; and the opening of the second air valve is controlled according to the actual temperature and the target temperature of the cargo warehouse. Therefore, by setting up a refrigeration bin and a heating bin to provide cooling and heating for the warehouse, and controlling the fan speed and the opening of the air valve at the same time, the temperature in the warehouse can be accurately controlled. This not only meets the refrigeration and heating needs of the food cabinet, but also improves the accuracy of the warehouse temperature control, improves the use efficiency of the food cabinet and the food quality of the food stored in the food cabinet.

[0168] According to an embodiment of the present invention, a computer program product corresponding to the control method of the meal cabinet is also provided, wherein the computer program product comprises a computer program, and when the computer program product is processed and executed, the steps of the control method of the meal cabinet are implemented.

[0169] Since the processing and functions implemented by the computer program product of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0170] According to the technical solution of the present invention, the meal cabinet includes a cargo warehouse, a refrigeration warehouse and a heating warehouse; an evaporator and a first fan are provided at the refrigeration warehouse, and a condenser and a second fan are provided at the heating warehouse; the first fan is used to send the cold in the refrigeration warehouse into the cargo warehouse through the first air inlet of the cargo warehouse; the second fan is used to send the heat in the heating warehouse into the cargo warehouse through the second air inlet of the cargo warehouse; a first air valve is provided at the first air inlet, and a second air valve is provided at the second air inlet; when the cargo warehouse is in the refrigeration mode, the rotation speed of the first fan is controlled according to the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse and the cold in the refrigeration warehouse; and the opening of the first air valve is controlled according to the actual temperature and the target temperature of the cargo warehouse; when the cargo warehouse is in the heating mode, the rotation speed of the second fan is controlled according to the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse and the heat in the heating warehouse; and the opening of the second air valve is controlled according to the actual temperature and the target temperature of the cargo warehouse. Therefore, by setting up a refrigeration bin and a heating bin to provide cooling and heating for the warehouse, and controlling the fan speed and the opening of the air valve at the same time, the temperature in the warehouse can be accurately controlled. This not only meets the refrigeration and heating needs of the food cabinet, but also improves the accuracy of the warehouse temperature control, improves the use efficiency of the food cabinet and the food quality of the food stored in the food cabinet.

[0171] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0172] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A method for controlling a dining cabinet, characterized in that: The food cabinet includes a cargo compartment, a refrigeration compartment, and a heating compartment; the refrigeration compartment is provided with an evaporator and a first fan, and the heating compartment is provided with a condenser and a second fan; the cargo compartment includes a first air inlet and a second air inlet; the first fan is used to send the cold in the refrigeration compartment into the cargo compartment through the first air inlet; the second fan is used to send the heat in the heating compartment into the cargo compartment through the second air inlet; A first air valve is provided at the first air inlet, and a second air valve is provided at the second air inlet; The method comprises: Obtaining the actual temperature in the cargo warehouse, the target temperature of the cargo warehouse, the cooling capacity in the refrigeration warehouse, and the heating capacity in the heating warehouse; Determining whether the cargo hold is in cooling mode or heating mode; If the cargo warehouse is in cooling mode, the speed of the first fan is controlled according to the actual temperature, the target temperature, and the cooling capacity in the refrigeration warehouse; and / or the opening of the first air valve is controlled according to the actual temperature and the target temperature; If the cargo warehouse is in heating mode, the speed of the second fan is controlled according to the actual temperature, the target temperature, and the amount of heat in the heating warehouse; and / or the opening of the second air valve is controlled according to the actual temperature and the target temperature.

2. The control method of the dining cabinet according to claim 1, characterized in that: Also includes: If the cargo compartment is in cooling mode, the opening of the second air valve is controlled to be the minimum opening; If the cargo hold is in heating mode, the opening of the first air valve is controlled to be the minimum opening.

3. The control method of the dining cabinet according to claim 1, characterized in that: Controlling the rotation speed of the first fan according to the actual temperature, the target temperature, and the cooling capacity in the refrigeration bin includes: Calculating the required cooling capacity of the warehouse according to the actual temperature, the target temperature, and a preset first formula; The result of subtracting the required cooling capacity from the cooling capacity in the refrigeration bin is recorded as the cooling capacity difference, and the magnitude relationship between the cooling capacity difference and the preset cooling capacity threshold is determined; If the cooling capacity difference is greater than a preset cooling capacity threshold, controlling the rotation speed of the first fan to be a preset first rotation speed; If the cooling capacity difference is less than or equal to the preset cooling capacity threshold, and the cooling capacity in the refrigeration bin is greater than the required cooling capacity, the speed of the first fan is controlled to be a preset second speed; the preset first speed> the preset second speed; the preset first formula is: Among them, Q_l1 is the required cooling capacity of the warehouse; T_target_i is the target temperature; T_current_i is the actual temperature; Hc is the inner wall area of ​​the warehouse; N and i are parameters.

4. The control method of the dining cabinet according to claim 1 or 3, characterized in that: Controlling the opening of the first air valve according to the actual temperature and the target temperature includes: Recording the difference between the target temperature and the actual temperature as a first temperature difference; Determine whether the first temperature difference is less than 0; If the first temperature difference is less than 0, increasing the opening of the first air valve by a preset first opening adjustment amount; If the first temperature difference is equal to 0, the opening of the first air valve is kept unchanged; If the first temperature difference is greater than 0, and the absolute value of the first temperature difference is greater than a preset temperature threshold, the opening of the first air valve is reduced.

5. The control method of the dining cabinet according to claim 1, characterized in that: Controlling the speed of the second fan according to the actual temperature, the target temperature, and the amount of heat in the heating chamber includes: Calculating the required heat of the cargo warehouse according to the actual temperature, the target temperature, and a preset second calculation formula; The result of subtracting the required heat from the heat in the heating chamber is recorded as a heat difference, and the magnitude relationship between the heat difference and a preset heat threshold is determined; If the heat difference is greater than a preset heat threshold, controlling the speed of the second fan to a preset third speed; If the heat difference is less than or equal to the preset heat threshold, and the heat in the heating chamber is greater than the required heat, the speed of the second fan is controlled to be the preset fourth speed; the preset third speed> the preset fourth speed; the preset second formula is: Among them, Q_l2 is the required heat of the warehouse; T_target_i is the target temperature; T_current_i is the actual temperature; Hc is the inner wall area of ​​the warehouse; N and i are parameters.

6. The control method of the dining cabinet according to claim 1 or 5, characterized in that: Controlling the opening of the second air valve according to the actual temperature and the target temperature includes: Recording the difference between the target temperature and the actual temperature as a second temperature difference; Determine whether the second temperature difference is greater than 0; If the second temperature difference is greater than 0, the opening of the second air valve is increased by a preset second opening adjustment amount; If the second temperature difference is equal to 0, the opening of the second air valve is kept unchanged; If the second temperature difference is less than 0, and the absolute value of the second temperature difference is greater than a preset temperature threshold, the opening of the second air valve is reduced.

7. A control device for a dining cabinet, characterized in that: The food cabinet includes a cargo compartment, a refrigeration compartment, and a heating compartment; the refrigeration compartment is provided with an evaporator and a first fan, and the heating compartment is provided with a condenser and a second fan; the cargo compartment includes a first air inlet and a second air inlet; the first fan is used to send the cold in the refrigeration compartment into the cargo compartment through the first air inlet; the second fan is used to send the heat in the heating compartment into the cargo compartment through the second air inlet; A first air valve is provided at the first air inlet, and a second air valve is provided at the second air inlet; The device comprises: an acquisition unit configured to acquire an actual temperature in the cargo warehouse, a target temperature in the cargo warehouse, a cooling capacity in the refrigeration warehouse, and a heating capacity in the heating warehouse; a control unit configured to determine whether the cargo hold is in a cooling mode or a heating mode; The control unit is further configured to control the speed of the first fan according to the actual temperature, the target temperature, and the cooling capacity in the refrigeration bin if the bin is in a refrigeration mode; and / or control the opening of the first air valve according to the actual temperature and the target temperature; The control unit is further configured to control the speed of the second fan according to the actual temperature, the target temperature, and the heat in the heating warehouse if the warehouse is in heating mode; and / or to control the opening of the second air valve according to the actual temperature and the target temperature.

8. A dining cabinet, characterized in that: include: The control device of the dining cabinet as claimed in claim 7.

9. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the control method of the dining cabinet according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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