A Multi-Temperature Zone Automotive Air Conditioning System Based on Mixed Airflow and Its Control Method

Abstract

This invention discloses a multi-temperature zone automotive air conditioning system based on mixed airflow and its control method, belonging to the field of automotive air conditioning technology. It includes a variable frequency compressor, a four-way reversing valve, an outdoor heat exchanger, a regenerator, a throttling device, an indoor heat exchanger, and a liquid receiver connected by pipelines. A fan is installed at the inlet of the second indoor heat exchanger. The air generated by the fan flows sequentially through the second and first indoor heat exchangers and is delivered to each air conditioning outlet. Damperes are provided within the airflow ducts to separate airflows of different temperatures within each duct. This invention, through a dual heat exchanger structure, provides three different temperatures of airflow at the inlet, outlet, and intermediate section of the heat exchangers. By controlling the opening of each damper within each duct, the airflows of different temperatures are mixed in different proportions, thereby achieving multi-temperature airflow, replacing electric heating, reducing energy waste, and improving energy utilization efficiency.

Description

Technical Field

[0001] This invention belongs to the field of automotive air conditioning technology, and relates to a multi-temperature zone air supply automotive air conditioner based on mixed air and its control method. Background Technology

[0002] Given the environmental pollution and fossil fuel shortages caused by the widespread use of gasoline-powered vehicles, the use and promotion of electric vehicles is a powerful tool for promoting energy conservation and emission reduction, and achieving the "dual carbon" goal. Since electric vehicles use batteries as their power source and do not utilize engine waste heat, an independent heat pump air conditioning system becomes an indispensable part of electric vehicles.

[0003] Conventional air conditioning systems use a single air supply, with uniform air parameters for all air vents in the passenger compartment. This air supply path structure is simple and reliable. However, from the perspective of passenger thermal comfort, due to the unevenness of the thermal environment in the passenger compartment and the differences in thermal comfort requirements among different passengers, using independent air supply parameters for different areas of the air vents has become essential to achieve individual passenger thermal comfort, improve the overall thermal comfort level of passengers, and achieve refined air supply control. By adopting multi-temperature zoned air supply control in automotive air conditioning, different air supplies can be delivered to different passenger areas, thereby achieving different thermal environments and better adapting to the differentiated thermal comfort needs of different passengers.

[0004] Currently, automotive air conditioning systems primarily achieve multi-temperature airflow by reheating the air. This means that the air emanating from the interior heat exchanger is preheated before being delivered to each zone, thus controlling the air temperature to the desired level. While this method allows for multi-temperature airflow adjustment and relatively precise control, the cooling-then-heating approach results in significant waste of cooling capacity, ultimately reducing the overall efficiency of the zoned air conditioning system.

[0005] Therefore, in order to improve energy utilization efficiency and minimize energy waste while achieving zoned air supply, it is necessary to improve the air supply method of air conditioning. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-temperature zone air supply automotive air conditioner based on mixed air and its control method, so as to solve the technical problem that the realization of multi-temperature air supply in automotive air conditioners in the prior art is mainly achieved by reheating the supplied air, which results in energy waste and low energy utilization efficiency.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] In one aspect, this application provides a multi-temperature zone automotive air conditioner based on mixed airflow, comprising a variable frequency compressor, an outdoor heat exchanger, a regenerator, a throttling device, a first indoor heat exchanger, a second indoor heat exchanger, a four-way reversing valve, and a liquid receiver connected by pipelines; the four ports of the four-way reversing valve are respectively connected to the variable frequency compressor, the outdoor heat exchanger, the regenerator, and the liquid receiver; the outdoor heat exchanger and the regenerator are also directly connected by pipelines; the inlet of the variable frequency compressor is also directly connected to the outlet of the liquid receiver by a pipeline; The heat exchanger is connected to a throttling device and a second indoor heat exchanger, respectively. The outlet of the throttling device is connected to the first indoor heat exchanger. A fan is installed at the inlet of the second indoor heat exchanger. The air generated by the fan can flow through the second indoor heat exchanger and the first indoor heat exchanger in sequence and be sent to the air conditioning outlet. There are several air conditioning outlets, all of which are connected to the air inlet pipe of the second indoor heat exchanger, the air outlet pipe of the second indoor heat exchanger, and the air outlet pipe of the first indoor heat exchanger. The fan, the variable frequency compressor, and the four-way reversing valve are all connected to the electronic control unit.

[0009] Further, the air conditioning outlet includes a first air outlet, a second air outlet, and a third air outlet; part of the air generated by the fan enters the second indoor heat exchanger, and the other part flows to the air conditioning outlet through the first damper; the air flowing to the air conditioning outlet is split by a sixth damper, with part entering the third air outlet and the other part flowing to the second air outlet; the air entering the second indoor heat exchanger, after heat exchange, flows out from the outlet of the second indoor heat exchanger, with part entering the first indoor heat exchanger and the other part flowing into the air conditioning outlet through the second damper; the flowing... The air from the air conditioning vent is split by the fifth damper, with one part entering the third air vent and the other part flowing to the second air vent. The air entering the first indoor heat exchanger is heated and then flows out from the air outlet of the first indoor heat exchanger. One part directly enters the first air vent, and the other part flows to the second and third air vents through the third damper. A fourth damper is set at the split point to control the specific air volume flowing into the second and third air vents. The first, second, third, fourth, fifth, and sixth dampers are all connected to the electronic control unit.

[0010] Furthermore, a first temperature sensor is installed at the air inlet of the second indoor heat exchanger; a second temperature sensor is installed at the air outlet of the second indoor heat exchanger; and a third temperature sensor is installed at the air outlet of the first indoor heat exchanger. The first, second, and third temperature sensors are all connected to the electronic control unit.

[0011] Furthermore, a fourth temperature sensor is installed at the first air outlet; a fifth temperature sensor is installed at the second air outlet.

[0012] Furthermore, a sixth temperature sensor is installed at the third air outlet; the fourth, fifth, and sixth temperature sensors are all connected to the electronic control unit.

[0013] Furthermore, the electronic control unit is also connected to a control panel; the control panel is used to input the setpoint signals of the air volume and air temperature of each area and transmit them to the electronic control unit.

[0014] Furthermore, the fan is a variable frequency fan.

[0015] Secondly, the present invention provides a control method for the above-mentioned multi-temperature zone air supply automotive air conditioner based on mixed airflow, comprising the following steps:

[0016] The control panel reads the user-input target temperature and air volume for each area and sends them to the electronic control unit. The electronic control unit receives the temperature sensor signal, calculates the required air volume for each temperature segment of the air supply, and controls the opening of the first, second, and third dampers according to the obtained air volume ratio. This controls the air distribution ratio of each temperature at the inlet, outlet, and outlet of the second indoor heat exchanger and the outlet of the first indoor heat exchanger. Based on the required air volume for each temperature segment of the air supply in each area, the control unit controls the opening of the fourth, fifth, and sixth dampers, thereby controlling the air distribution ratio of each temperature. The divided air at each temperature is mixed proportionally at each air outlet, thus achieving air supply with different temperatures and air volumes.

[0017] Furthermore, the calculation of the air volume ratio includes the following steps:

[0018] For each air supply route delivered to the passenger compartment, the electronic control unit receives information from the control panel regarding the air volume Q for that route. i and supply air temperature setpoint T i The system receives signals from the temperature sensor to obtain the inlet air temperature T of the second indoor heat exchanger. in The outlet air temperature T of the second indoor heat exchanger mid and the outlet air temperature T of the first indoor heat exchanger out Compare the setpoint T of the air supply temperature for that route. i With T in T out and T mid Based on the relationship, the required ratio of inlet and outlet air for each heat exchanger section is calculated;

[0019] When the system is in cooling mode:

[0020]

[0021] In the formula, x1 and x2 represent temperatures higher than T, respectively. i and temperatures below T i The ratio of the two mixed air components;

[0022] When the system is in heating mode:

[0023]

[0024] In the formula, x1 and x2 represent temperatures higher than T, respectively. i and temperatures below T i The ratio of the two mixed air components;

[0025] Multiply the obtained air mixing ratio by the air volume Q of that path. i The required inlet and outlet air volumes for each heat exchanger section are determined using the following formula:

[0026]

[0027] In the formula, Q in,i Q is the inlet air volume of the second indoor heat exchanger; mid,i The air volume at the outlet of the second indoor heat exchanger; the air volume at the outlet of the first indoor heat exchanger.

[0028] Furthermore, the calculation method for the opening degrees of the first, second, third, fourth, fifth, and sixth air dampers is as follows:

[0029] The opening degree d1 of the first damper is determined based on the required proportion of the inlet air of the second indoor heat exchanger to the total air volume. The specific calculation formula is as follows:

[0030]

[0031] Based on the required proportions of the outlet air from the first heat exchanger and the outlet air from the second indoor heat exchanger to the total air volume, determine the opening degree d2 of the second damper. The specific calculation formula is as follows:

[0032]

[0033] The opening degree d3 of the third damper is determined based on the proportion of the required air volume at the outlet of the first heat exchanger to the total air volume at the outlet of the first heat exchanger. The specific calculation formula is as follows:

[0034]

[0035] In the formula, Q out,1 The required air volume at the outlet of the first heat exchanger for supplying air to the first air outlet;

[0036] Based on the ratio of the total air volume required from the first heat exchanger outlet to the air volume supplied at the second and third air outlets, the opening degree d4 of the fourth damper is determined. The specific calculation formula is as follows:

[0037]

[0038] In the formula, Q out,2 Q is the required air volume at the outlet of the first heat exchanger for supplying air to the second air outlet. out,3 The required air volume at the outlet of the first heat exchanger for supplying air to the third air outlet;

[0039] Based on the ratio of the required air volume at the outlet of the second indoor heat exchanger to the required air volume at the second and third air outlets, the opening degree d5 of the fifth damper is determined. The specific calculation formula is as follows:

[0040]

[0041] In the formula, Q mid,2 Q is the required air volume at the outlet of the second heat exchanger for supplying air to the second air inlet. mid,3 The required air volume at the outlet of the second heat exchanger for supplying air to the third air outlet;

[0042] Based on the ratio of the inlet air volume of the second indoor heat exchanger required for air supply at the second air outlet and the third air outlet, the opening degree d6 of the sixth damper is determined. The specific calculation formula is as follows:

[0043]

[0044] In the formula, Q in,2 Q is the required inlet air volume of the second heat exchanger for supplying air to the second air outlet. in,3 The air volume required for the second heat exchanger inlet to supply air to the third air outlet.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] This invention discloses a multi-temperature zone air conditioning system for automobiles based on mixed airflow and its control method. Air generated by a fan flows sequentially through a second and a first indoor heat exchanger, and is delivered into the vehicle through multiple air conditioning vents. The two indoor heat exchangers can independently adjust their temperature, providing different temperatures of air according to the needs of different passengers. The target outlet air temperature of the first indoor heat exchanger is the minimum air temperature for each zone in cooling mode and the maximum air temperature for each zone in heating mode. This invention, through a dual heat exchanger structure, provides three different temperatures of airflow at the inlet, outlet, and intermediate sections of the heat exchangers. By controlling the opening of each damper in each air duct, the airflows of different temperatures are mixed in different proportions, thereby achieving multi-temperature airflow. This eliminates the secondary heating process, matching the cooling capacity of the cooling system with the required cooling capacity of the airflow, thus improving energy utilization efficiency and reducing energy waste. The electric vehicle zoned air conditioning system provided by this invention, calculated and analyzed under typical operating conditions, shows that its energy consumption can be reduced by about 15% to 35% compared with electric heating under the same conditions. It has significant economic and environmental benefits, and makes a significant contribution to environmental protection, alleviating the fossil energy crisis, and achieving carbon peaking and carbon neutrality. Attached Figure Description

[0047] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the structure of a multi-temperature zone air supply automotive air conditioner based on mixed airflow according to the present invention;

[0049] Figure 2 This is a schematic diagram of the signal receiving and control of the electronic control unit of the present invention.

[0050] The components include: 1. Variable frequency compressor; 2. Outdoor heat exchanger; 3. Regenerator; 4. Throttling device; 51. First indoor heat exchanger; 52. Second indoor heat exchanger; 6. Four-way reversing valve; 7. Liquid receiver; 8. Variable frequency fan; 91. First damper; 92. Second damper; 93. Third damper; 94. Fourth damper; 95. Fifth damper; 96. Sixth damper; 101. First air outlet; 102. Second air outlet; 103. Third air outlet; 111. First temperature sensor; 112. Second temperature sensor; 113. Third temperature sensor; 114. Fourth temperature sensor; 115. Fifth temperature sensor; 116. Sixth temperature sensor; 12. Electrical control unit; 13. Control panel. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0053] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0054] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0055] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0056] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0057] The present invention will now be described in further detail with reference to the accompanying drawings:

[0058] See Figure 1 This invention discloses a multi-temperature zone automotive air conditioner based on mixed airflow, comprising a variable frequency compressor 1, an outdoor heat exchanger 2, a regenerator 3, a throttling device 4, a first indoor heat exchanger 51, a second indoor heat exchanger 52, a four-way reversing valve 6, and a liquid receiver 7 connected by pipelines; the four ports of the four-way reversing valve 6 are respectively connected to the variable frequency compressor 1, the outdoor heat exchanger 2, the regenerator 3, and the liquid receiver 7; the regenerator 3 is respectively connected to the throttling device 4 and the second indoor heat exchanger 52, and the outlet of the throttling device 4 is connected to... A fan is installed at the inlet of the first indoor heat exchanger 51; the air generated by the fan can flow through the second indoor heat exchanger 52 and the first indoor heat exchanger 51 in sequence and be sent to the air conditioning outlet; there are several air conditioning outlets, all of which are connected to the air inlet pipe of the second indoor heat exchanger 52, the air outlet pipe of the second indoor heat exchanger 52 and the air outlet pipe of the first indoor heat exchanger 51; the fan, the variable frequency compressor 1 and the four-way reversing valve 6 are all connected to the electrical control unit 12.

[0059] In one feasible embodiment of the present invention, the air conditioning outlet includes a first air outlet 101, a second air outlet 102 and a third air outlet 103.

[0060] It should be noted that part of the air generated by the fan enters the second indoor heat exchanger 52, and the other part flows to the air conditioning outlet through the first damper 91; the air flowing to the air conditioning outlet is split by the sixth damper 96, with part entering the third air outlet 103 and the other part flowing to the second air outlet 102.

[0061] After the air entering the second indoor heat exchanger 52 is heat-exchanged, it flows out from the air outlet of the second indoor heat exchanger 52. Part of it enters the first indoor heat exchanger 51, and the other part flows into the air conditioning outlet through the second damper 92. The air flowing into the air conditioning outlet is split by the fifth damper 95. Part of it enters the third air outlet 103, and the other part flows to the second air outlet 102.

[0062] After heat exchange, the air entering the first indoor heat exchanger 51 flows out from the air outlet of the first indoor heat exchanger 51. Part of it directly enters the first air supply outlet 101, and the other part flows to the second air supply outlet 102 and the third air supply outlet 103 through the third damper 93. A fourth damper 94 is set at the split point to control the specific air volume flowing into the second air supply outlet 102 and the third air supply outlet 103. The first damper 91, the second damper 92, the third damper 93, the fourth damper 94, the fifth damper 95 and the sixth damper 96 are all connected to the electrical control unit 12.

[0063] In one feasible embodiment of the present invention, a first temperature sensor 111 is installed at the air inlet of the second indoor heat exchanger 52; a second temperature sensor 112 is installed at the air outlet of the second indoor heat exchanger 52; and a third temperature sensor 113 is installed at the air outlet of the first indoor heat exchanger 51. The first temperature sensor 111, the second temperature sensor 112, and the third temperature sensor 113 are all connected to the electronic control unit 12. A fourth temperature sensor 114 is installed at the first air outlet 101; a fifth temperature sensor 115 is installed at the second air outlet 102; and a sixth temperature sensor 116 is installed at the third air outlet 103. The fourth temperature sensor 114, the fifth temperature sensor 115, and the sixth temperature sensor 116 are all connected to the electronic control unit 12.

[0064] In one feasible embodiment of the present invention, see [link to relevant documentation]. Figure 2 The electronic control unit 12 is also connected to a control panel 13; the control panel 13 is used to input the setpoint signals of the air volume and air temperature of each area and transmit them to the electronic control unit 12.

[0065] In one feasible embodiment of the present invention, the fan is preferably a variable frequency fan 8.

[0066] This invention discloses a control method for a multi-temperature zone automotive air conditioning system based on mixed airflow, comprising the following steps:

[0067] The control panel 13 reads the target temperature and air volume of each area input by the user and sends them to the electronic control unit 12. The electronic control unit 12 receives the temperature sensor signal, calculates the required air volume of each temperature segment for each air supply, and controls the opening of the first damper 91, the second damper 92 and the third damper 93 according to the obtained air volume ratio. This controls the air distribution ratio of each temperature at the inlet of the second indoor heat exchanger 52, the outlet of the second indoor heat exchanger 52 and the outlet of the first indoor heat exchanger 51. According to the required air volume of each temperature segment for each area, the control unit controls the opening of the fourth damper 94, the fifth damper 95 and the sixth damper 96. This controls the air distribution ratio of each temperature and mixes the divided air at each air outlet according to the ratio, thereby achieving air supply of different temperatures and air volumes.

[0068] It should be noted that in this embodiment, each air supply system entering the passenger compartment mixes the inlet and outlet air from two of the internal heat exchangers (51-52) with slightly higher and slightly lower temperatures, based on the target temperature. Exceptionally, the lowest temperature air supply in cooling mode and the highest temperature air supply in heating mode directly utilize the outlet air from the internal heat exchanger 51. The electronic control unit 12 can receive the air conditioning mode setting signal from the control panel 13 and control the state of the four-way reversing valve 6 to switch between cooling and heating modes. The target air temperature at the outlet of the internal heat exchanger 51 is the minimum air supply temperature for each area in cooling mode and the maximum air supply temperature for each area in heating mode.

[0069] In one feasible embodiment of the present invention, the calculation of the air volume ratio includes the following steps:

[0070] For each air supply route delivered to the passenger compartment, the electronic control unit 12 receives information from the control panel 13 regarding the air volume Q of that route. i and supply air temperature setpoint T i The signal is received, and the temperature sensor signal is received to obtain the inlet air temperature T of the second indoor heat exchanger 52. in The outlet air temperature T of the second indoor heat exchanger 52 mid and the outlet air temperature T of the first indoor heat exchanger 51 out Compare the setpoint T of the air supply temperature for that route. i With T in T out and T mid Based on the relationship, the required ratio of inlet and outlet air for each heat exchanger section is calculated;

[0071] When the system is in cooling mode:

[0072]

[0073] In the formula, x1 and x2 represent temperatures higher than T, respectively. i and temperatures below T i The ratio of the two mixed air components;

[0074] When the system is in heating mode:

[0075]

[0076] In the formula, x1 and x2 represent temperatures higher than T, respectively. i and temperatures below T i The ratio of the two mixed air components;

[0077] Multiply the obtained air mixing ratio by the air volume Q of that path. i The required inlet and outlet air volumes for each heat exchanger section are determined using the following formula:

[0078]

[0079] In the formula, Q in,i For the second indoor heat exchanger, the inlet air volume is 52; Q mid,i The air volume at the outlet of the second indoor heat exchanger 52; the air volume at the outlet of the first indoor heat exchanger 51.

[0080] Exceptionally, when T i When the target air temperature for each area is the minimum or the maximum value under heating mode, the air supplied in this route will all be from the outlet air of the first indoor heat exchanger 51.

[0081] In a feasible embodiment of the present invention, the calculation method for the opening degrees of the first damper 91, the second damper 92, the third damper 93, the fourth damper 94, the fifth damper 95, and the sixth damper 96 is as follows:

[0082] Based on the required proportion of the inlet air of the second indoor heat exchanger 52 to the total air volume, the opening degree d1 of the first damper 91 is determined, and the specific calculation formula is as follows:

[0083]

[0084] Based on the required proportions of the outlet air from the first heat exchanger 51 and the outlet air from the second indoor heat exchanger 52 to the total air volume, the opening degree d2 of the second damper 92 is determined. The specific calculation formula is as follows:

[0085]

[0086] Based on the proportion of the required air volume at the outlet of the first heat exchanger 51 to the total air volume at the outlet of the first heat exchanger 51, the opening degree d3 of the third damper 93 is determined. The specific calculation formula is as follows:

[0087]

[0088] In the formula, Q out,1 The required air volume at the outlet of the first heat exchanger 51 for air supply at the first air outlet 101;

[0089] Based on the ratio of the total air volume required for the air supply at the second air outlet 102 and the third air outlet 103 to the total air volume at the outlet of the first heat exchanger 51, the opening degree d4 of the fourth damper 94 is determined. The specific calculation formula is as follows:

[0090]

[0091] In the formula, Q out,2 The required outlet air volume of the first heat exchanger 51 for air supply at the second air outlet 102; Q out,3 The required air volume at the outlet of the first heat exchanger 51 for air supply at the third air outlet 103;

[0092] Based on the ratio of the air volume required for the air supply at the second air outlet 102 and the third air outlet 103 to the outlet air volume at the outlet of the second indoor heat exchanger 52, the opening degree d5 of the fifth damper 95 is determined. The specific calculation formula is as follows:

[0093]

[0094] In the formula, Q mid,2 Q is the required outlet air volume of the second heat exchanger 52 for air supply at the second air outlet 102; mid,3 The required outlet air volume of the second heat exchanger 52 for air supply at the third air outlet 103;

[0095] Based on the ratio of the inlet air volume of the second indoor heat exchanger 52 required for the air supply at the second air outlet 102 and the third air outlet 103, the opening degree d6 of the sixth damper 96 is determined. The specific calculation formula is as follows:

[0096]

[0097] In the formula, Q in,2 The required inlet air volume for the second heat exchanger 52 to supply air at the second air outlet 102; Q in,3 The air volume at the inlet of the second heat exchanger 52 required for air supply at the third air outlet 103.

[0098] The working principle of this invention is as follows:

[0099] This invention comprises a refrigeration system consisting of a variable frequency compressor 1, an outdoor heat exchanger 2, a regenerator 3, a throttling device 4, a first indoor heat exchanger 51, a second indoor heat exchanger 52, a four-way reversing valve 6, and a liquid receiver 7; and an air supply system consisting of a variable frequency fan 8, a first damper 91, a second damper 92, a third damper 93, a fourth damper 94, a fifth damper 95, a sixth damper 96, a first air outlet 101, a second air outlet 102, and a third air outlet 103. The variable frequency fan 8 is connected to the first indoor heat exchanger 51 and the second indoor heat exchanger 52 of the refrigeration system, and the air outlets 101-103 are connected to the corresponding areas of the passenger compartment. A first temperature sensor 111, a second temperature sensor 112, a third temperature sensor 113, a fourth temperature sensor 114, a fifth temperature sensor 115, and a sixth temperature sensor 116 are arranged in the air duct of the air supply system to detect the air temperature at various locations.

[0100] The system includes an electronic control unit 12 and a control panel 13. The control panel 13 is located in the passenger compartment and connected to the electronic control unit 12, used to input passenger setting data to the electronic control unit 12. The electronic control unit 12 is connected to the variable frequency compressor 1 of the refrigeration system and controls the speed of the variable frequency compressor 1. The electronic control unit is also connected to the four-way reversing valve 6 and controls the state of the four-way reversing valve 6. The electronic control unit 12 is connected to the variable frequency fan 8 of the air supply system and the dampers 91-96, controlling the speed of the variable frequency fan 8 and the opening degree of the dampers 91-96. The electronic control unit 12 is also connected to the temperature sensors 111-116 and used to receive temperature sensor data.

[0101] The refrigeration system uses carbon dioxide as a refrigerant and achieves heat exchange with the air supplied by the air supply system through the first indoor heat exchanger 51 and the second indoor heat exchanger 52; heat exchange also occurs between the high-pressure section and the low-pressure section of the regenerator 3.

[0102] The air supply system generates air supply through the variable frequency fan 8 and connects to the first indoor heat exchanger 5 and the second indoor heat exchanger 52 for heat exchange. Multi-zone air supply temperature control is achieved through air intake and mixing in the middle of the two heat exchangers. Part of the air supply is drawn out through the first damper 91 and the second damper 92 at the inlet, outlet and middle section of the two heat exchangers, respectively. The air supply at different temperatures is divided through the third damper 93, the fourth damper 94, the fifth damper 95 and the sixth damper 96. Finally, the air supply is mixed in proportion at the air supply outlets 101-103 to obtain the air supply at the required temperature and is delivered to the corresponding area of ​​the passenger compartment through the air supply outlets 101-103.

[0103] The temperature sensors 111-116 are installed at the air outlets 101-103 of each area, the outlet air duct of the first internal heat exchanger 51, the inlet air duct of the second heat exchanger 52, and the middle section air duct of the indoor heat exchangers 51-52. They are used to detect the air temperature at each air outlet and at the inlet, outlet, and middle section of the internal heat exchangers, and send the detection results to the electronic control unit 12.

[0104] The electronic control unit 12 is used to determine the air temperature of each area based on the detection signals of the temperature sensors 111-116, and to receive signals from the control panel 13. It inputs control signals according to a preset control method, and controls the cooling system and air supply system to match the air supply temperature and air volume of each area with the target signals on the control panel. The four-way reversing valve 6 is used to switch the operating mode of the cooling system, and it has two states, corresponding to cooling and heating modes respectively.

[0105] This invention employs a multi-temperature air supply mixing method to obtain air at different temperatures, replacing electric heating, thereby reducing energy waste and improving energy utilization efficiency. Calculations and analyses of the electric vehicle zoned air conditioning system provided by this invention under typical operating conditions show that, compared with electric heating, its energy consumption can be reduced by approximately 15% to 35% under the same conditions, demonstrating significant economic and environmental benefits. This makes a significant contribution to environmental protection, alleviating the fossil fuel crisis, and achieving carbon peaking and carbon neutrality.

[0106] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-temperature zone automotive air conditioning system based on mixed airflow, characterized in that, The system includes a variable frequency compressor (1), an outdoor heat exchanger (2), a regenerator (3), a throttling device (4), a first indoor heat exchanger (51), a second indoor heat exchanger (52), a four-way reversing valve (6), and a liquid receiver (7) connected by pipelines. The four ports of the four-way reversing valve (6) are respectively connected to the variable frequency compressor (1), the outdoor heat exchanger (2), the regenerator (3), and the liquid receiver (7). The outdoor heat exchanger (2) and the regenerator (3) are also directly connected by pipelines. The inlet of the variable frequency compressor (1) is also directly connected to the outlet of the liquid receiver (7) by pipelines. The regenerator (3) is connected to the throttling device (4) and the second indoor heat exchanger. One end of the device (52) is connected to the other end of the second indoor heat exchanger (52) through the first indoor heat exchanger (51); a fan is provided at the inlet of the second indoor heat exchanger (52); the air generated by the fan can flow through the second indoor heat exchanger (52) and the first indoor heat exchanger (51) in sequence and be sent to the air conditioning outlet; there are several air conditioning outlets, all of which are connected to the air inlet pipe of the second indoor heat exchanger (52), the air outlet pipe of the second indoor heat exchanger (52) and the air outlet pipe of the first indoor heat exchanger (51); the fan, the variable frequency compressor (1) and the four-way reversing valve (6) are all connected to the electrical control unit (12). The air conditioning outlet includes a first air outlet (101), a second air outlet (102), and a third air outlet (103); part of the air generated by the fan enters the second indoor heat exchanger (52), and the other part flows to the air conditioning outlet through the first damper (91); the air flowing to the air conditioning outlet is split by the sixth damper (96), with part entering the third air outlet (103) and the other part flowing to the second air outlet (102); the air entering the second indoor heat exchanger (52) flows out from the outlet of the second indoor heat exchanger (52) after heat exchange, part of it enters the first indoor heat exchanger (51), and the other part flows into the air conditioning outlet through the second damper (92); the air flowing into the air conditioning outlet is split by the fifth damper (95). The airflow enters the third air outlet (103) and flows to the second air outlet (102). After heat exchange, the air entering the first indoor heat exchanger (51) flows out from the air outlet of the first indoor heat exchanger (51). Part of it directly enters the first air outlet (101), and the other part flows to the second air outlet (102) and the third air outlet (103) through the third damper (93). A fourth damper (94) is set at the split point to control the specific airflow into the second air outlet (102) and the third air outlet (103). The first damper (91), the second damper (92), the third damper (93), the fourth damper (94), the fifth damper (95) and the sixth damper (96) are all connected to the electrical control unit (12).

2. The multi-temperature zone automotive air conditioning system based on mixed air supply according to claim 1, characterized in that, A first temperature sensor (111) is installed at the air inlet of the second indoor heat exchanger (52); a second temperature sensor (112) is installed at the air outlet of the second indoor heat exchanger (52); a third temperature sensor (113) is installed at the air outlet of the first indoor heat exchanger (51); the first temperature sensor (111), the second temperature sensor (112) and the third temperature sensor (113) are all connected to the electronic control unit (12).

3. A multi-temperature zone automotive air conditioning system based on mixed air supply according to claim 2, characterized in that, A fourth temperature sensor (114) is installed at the first air outlet (101); a fifth temperature sensor (115) is installed at the second air outlet (102).

4. A multi-temperature zone automotive air conditioning system based on mixed air supply according to claim 3, characterized in that, A sixth temperature sensor (116) is installed at the third air outlet (103); the fourth temperature sensor (114), the fifth temperature sensor (115) and the sixth temperature sensor (116) are all connected to the electronic control unit (12).

5. A multi-temperature zone automotive air conditioning system based on mixed air supply according to claim 4, characterized in that, The electronic control unit (12) is also connected to a control panel (13); the control panel (13) is used to input the air volume and air temperature setpoint signals of each area and transmit them to the electronic control unit (12).

6. A multi-temperature zone automotive air conditioning system based on mixed air supply according to claim 1, characterized in that, The fan is a variable frequency fan (8).

7. A control method for a multi-temperature zone automotive air conditioning system based on mixed airflow as described in any one of claims 1 to 6, characterized in that, Includes the following steps: The control panel (13) reads the target temperature and air volume of each area input by the user and sends them to the electronic control unit (12). The electronic control unit (12) receives the temperature sensor signal, calculates the air volume of each temperature air supply required for each air supply, and controls the opening of the first damper (91), the second damper (92) and the third damper (93) according to the obtained air volume ratio. Thus, it controls the air split ratio of each temperature air supply at the inlet of the second indoor heat exchanger (52), the outlet of the second indoor heat exchanger (52) and the outlet of the first indoor heat exchanger (51). According to the air volume of each temperature air supply required for each area, it controls the opening of the fourth damper (94), the fifth damper (95) and the sixth damper (96), thus controlling the air supply split ratio of each temperature air supply. The split air supply of each temperature air supply is mixed in each air supply outlet according to the ratio, thereby realizing the air supply of different temperatures and air volumes.

8. The control method for a multi-temperature zone automotive air conditioning system based on mixed air supply according to claim 7, characterized in that, The calculation of the air volume ratio includes the following steps: For each air supply route to the crew compartment, the electronic control unit (12) receives information from the control panel (13) regarding the air volume of that air supply route. Q i and air supply temperature setpoint T i The signal is received, and the temperature sensor signal is received to obtain the inlet air temperature of the second indoor heat exchanger (52). T in The outlet air temperature of the second indoor heat exchanger (52) T mid and the outlet air temperature of the first indoor heat exchanger (51) T out Compare the air supply temperature setpoint of this route. T i and T in , T out and T mid Based on the relationship, the required ratio of inlet and outlet air for each heat exchanger section is calculated; When the system is in cooling mode: and In the formula, x 1 and x 2 are respectively the temperature is higher than T i and temperatures below T i The ratio of the two mixed air components; When the system is in heating mode: and In the formula, x 1 and x 2 are respectively the temperature is higher than T i and temperatures below T i The ratio of the two mixed air components; Multiply the obtained air mixing ratio by the air volume of that supply path. Q i The required inlet and outlet air volumes for each heat exchanger section are determined using the following formula: or In the formula, Q in,i For the inlet air volume of the second indoor heat exchanger (52); Q mid,i The outlet air volume of the second indoor heat exchanger (52); the outlet air volume of the first indoor heat exchanger (51).

9. The control method for a multi-temperature zone automotive air conditioning system based on mixed air supply according to claim 8, characterized in that, The calculation method for the opening of the first air damper (91), the second air damper (92), the third air damper (93), the fourth air damper (94), the fifth air damper (95), and the sixth air damper (96) is as follows: The opening degree of the first damper (91) is determined based on the proportion of the inlet air of the second indoor heat exchanger (52) to the total air volume. d 1. The specific calculation formula is as follows: The opening degree of the second damper (92) is determined based on the proportion of the required outlet air of the first indoor heat exchanger (51) and the outlet air of the second indoor heat exchanger (52) to the total air volume. d 2. The specific calculation formula is as follows: The opening degree of the third damper (93) is determined based on the proportion of the outlet air volume of the first indoor heat exchanger (51) required for air supply at the first air outlet (101) to the total outlet air volume of the first indoor heat exchanger (51). d 3. The specific calculation formula is as follows: In the formula, The air volume at the outlet of the first indoor heat exchanger (51) required to supply air to the first air outlet (101); Based on the ratio of the total air volume of the first indoor heat exchanger (51) required for air supply at the second air outlet (102) and the third air outlet (103), the opening degree of the fourth damper (94) is determined. d 4. The specific calculation formula is as follows: In the formula, The air volume at the outlet of the first indoor heat exchanger (51) required to supply air to the second air outlet (102); The air volume at the outlet of the first indoor heat exchanger (51) required to supply air to the third air outlet (103); Based on the ratio of the air volume required for the second indoor heat exchanger (52) outlet to the air supply at the second air outlet (102) and the third air outlet (103), determine the opening degree of the fifth damper (95). d 5. The specific calculation formula is as follows: In the formula, The air volume at the outlet of the second indoor heat exchanger (52) required to supply air to the second air outlet (102); The outlet air volume of the second indoor heat exchanger (52) required to supply air to the third air outlet (103); Based on the ratio of the inlet air volume of the second indoor heat exchanger (52) required for air supply at the second air outlet (102) and the third air outlet (103), determine the opening degree of the sixth damper (96). d 6. The specific calculation formula is as follows: In the formula, The inlet air volume of the second indoor heat exchanger (52) required to supply air to the second air outlet (102); The inlet air volume of the second indoor heat exchanger (52) required to supply air to the third air outlet (103).

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