A multi-temperature-zone air supply heat pump air conditioning system and a control method thereof

Abstract

The application discloses a kind of multi-temperature zone air supply heat pump air conditioning systems and its control method, belong to electric automobile air conditioning technical field;The system includes refrigeration system, air supply system and electric control unit;The refrigeration system includes variable frequency compressor, liquid accumulator, outdoor heat exchanger, regenerator and four-way reversing valve;The outlet of regenerator is connected with first throttling device and second indoor heat exchanger respectively, and the outlet of first throttling device is connected to first indoor heat exchanger;First indoor heat exchanger and second indoor heat exchanger are connected to air supply system;The air supply system includes fan, first air outlet and third air outlet;The inlet of first indoor heat exchanger is connected third air outlet;The outlet of first indoor heat exchanger is connected first air outlet and second air outlet respectively.The application obtains multiple different temperature air supply by pre-matching design double heat exchanger structure, and by intermediate throttling, and further temperature adjustment is carried out by electric heating, to realize multi-temperature zone air supply.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric vehicle air conditioners and relates to a heat pump air conditioning system for multi-temperature zone air supply and a control method thereof. Background Art

[0002] Faced with current challenges such as fossil energy shortages, the greenhouse effect, and environmental pollution, pure electric vehicles are gradually entering people's lives as a proven solution. Their use and promotion is a powerful tool for promoting energy conservation and emission reduction, and achieving the "dual carbon" goals. Compared to fuel-powered vehicles, electric vehicles lack the ability to utilize waste heat from the engine, making independent heat pump air conditioning systems an integral part of the vehicle.

[0003] Conventional automotive air conditioning systems use a single-temperature air supply, simply distributing air from the evaporator outlet to each of the vehicle's air outlets based on volume, without further adjusting the air temperature at each outlet. This air supply system offers a simple air path structure and stable and reliable operation. However, from the perspective of occupant thermal comfort, the uneven thermal environment within the passenger compartment and the varying physiological thermal requirements of different passengers mean that the air supply parameters required to achieve optimal thermal comfort vary across different areas of the cabin. Using independent air supply parameters for air outlets in different zones has become essential to achieving thermal comfort for occupants in each compartment, improving overall passenger thermal comfort, and achieving refined air supply control. By implementing multi-temperature zoned air supply control for automotive air conditioning, different air supply can be provided to different passenger areas, creating distinct thermal environments and better accommodating the diverse thermal comfort needs of different passengers.

[0004] Currently, automotive air conditioners generally implement multi-temperature zone air supply by supercooling and then reheating the supply air. Specifically, the air at the indoor heat exchanger outlet is appropriately heated before being delivered to each zone, thereby controlling the supply air temperature to the desired level. While this method enables multi-temperature air supply regulation and is relatively simple to implement and control, it typically involves cooling the supply air to the required minimum temperature and then significantly heating the air that requires a relatively high temperature. This approach does not effectively regulate the system's cooling capacity and energy distribution, resulting in significant cooling waste and reducing the efficiency of the entire multi-temperature zone air supply system.

[0005] Therefore, in order to improve energy utilization efficiency and minimize energy waste on the basis of achieving multi-temperature zone air supply, it is necessary to improve the air supply form and control method of air conditioning. Summary of the Invention

[0006] The purpose of the present invention is to provide a heat pump air-conditioning system with multi-temperature zone air supply and a control method thereof, so as to solve the technical problem in the prior art that the air-conditioning air supply method of performing secondary heating of a single cold air to different degrees wastes cold energy, thereby reducing the efficiency of the entire multi-temperature zone air supply air-conditioning.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a heat pump air conditioning system for multi-temperature zone air supply, comprising:

[0009] A refrigeration system comprising a variable frequency compressor, a liquid accumulator, an outdoor heat exchanger, a regenerator, and a four-way reversing valve; the four interfaces of the four-way reversing valve are respectively connected to the variable frequency compressor, the outdoor heat exchanger, the regenerator, and the liquid accumulator; the variable frequency compressor and the liquid accumulator are also directly connected via a pipeline; the outdoor heat exchanger and the regenerator are also directly connected via a pipeline; the outlet of the regenerator is respectively connected to a first throttling device and a second indoor heat exchanger, and the outlet of the first throttling device is connected to a first indoor heat exchanger; the first indoor heat exchanger and the second indoor heat exchanger are connected to an air supply system;

[0010] An air supply system, the air supply system comprising a fan, a first air supply outlet, a second air supply outlet, and a third air supply outlet; the air generated by the fan passes through the second indoor heat exchanger and the first indoor heat exchanger in sequence; the inlet of the first indoor heat exchanger is connected to the third air supply outlet, and a third electric heater is provided in the air duct of the third air supply outlet; the outlet of the first indoor heat exchanger is connected to the first air supply outlet and the second air supply outlet respectively; a first electric heater is provided in the air duct of the first air supply outlet, and a second electric heater is provided in the air duct of the second air supply outlet;

[0011] The electronic control unit is electrically connected to the control panel, the variable frequency compressor, the four-way reversing valve, the fan, the first electric heater, the second electric heater and the third electric heater respectively; the electronic control unit is used to control the inlet and outlet air temperatures of the first indoor heat exchanger and the second indoor heat exchanger according to the target temperature input by the control panel, and then perform secondary heating through the first electric heater, the second electric heater and the third electric heater to finally reach the preset target temperature value of each area.

[0012] Furthermore, the refrigeration system also includes a second throttling device; the second throttling device is located on the connecting pipe between the regenerator and the second indoor heat exchanger; the first throttling device and the second throttling device are both electrically connected to the electronic control unit.

[0013] Furthermore, a second damper is provided at the inlet of the first indoor heat exchanger for controlling the air volume entering the third air supply port; the second damper is electrically connected to the electronic control unit.

[0014] Furthermore, a first damper is provided at the branching point of the pipeline main line connecting the first indoor heat exchanger to the first air supply port and the second air supply port respectively, for controlling the air volume entering the first air supply port and the second air supply port; the first damper is electrically connected to the electronic control unit.

[0015] Furthermore, the refrigeration system further includes an exhaust pressure sensor; the exhaust pressure sensor is located between the variable frequency compressor and the four-way reversing valve; and the exhaust pressure sensor is electrically connected to the electronic control unit.

[0016] Furthermore, a first temperature sensor is provided at the inlet of the first indoor heat exchanger; a second temperature sensor is provided at the outlet of the first indoor heat exchanger; a third temperature sensor is installed at the air outlet of the first air supply outlet; a fourth temperature sensor is installed at the air outlet of the second air supply outlet; and a fifth temperature sensor is installed at the air outlet of the third air supply outlet; the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor and the fifth temperature sensor are all electrically connected to the electronic control unit.

[0017] Furthermore, the fan is a variable frequency fan.

[0018] Furthermore, the refrigerant used in the refrigeration system is carbon dioxide.

[0019] In a second aspect, the present invention provides a method for controlling the multi-temperature zone heat pump air conditioning system, comprising the following steps:

[0020] The target temperature and air supply volume of each zone are transmitted to the electronic control unit through the control panel, and the target air supply temperature of each zone is determined according to the target temperature of each zone, thereby determining the inlet and outlet air temperatures of the first indoor heat exchanger and the second indoor heat exchanger;

[0021] The electronic control unit receives the signal from the exhaust pressure sensor, detects the exhaust pressure of the variable frequency compressor, and controls the speed of the variable frequency compressor to make the exhaust pressure reach the target value;

[0022] The electronic control unit receives signals from the first temperature sensor and the second temperature sensor to detect the inlet and outlet air temperatures of the first indoor heat exchanger; obtains the air-side heat exchange amount based on the target inlet and outlet air temperatures and air volumes of the first indoor heat exchanger and the second indoor heat exchanger, thereby determining the evaporation temperature of the refrigerant in the first indoor heat exchanger and the second indoor heat exchanger, and controls the openings of the first throttling device and the second throttling device so that the evaporation temperature of the refrigerant in the first indoor heat exchanger and the second indoor heat exchanger reaches the target value, thereby making the inlet and outlet air temperatures of the first indoor heat exchanger reach the target value;

[0023] The sum of the air supply volumes in each area is taken as the total air supply volume of the air supply system, and the total air supply volume of the air supply system is controlled to reach the target value by controlling the variable frequency fan;

[0024] The electronic control unit receives signals from the third temperature sensor, the fourth temperature sensor, and the fifth temperature sensor, detects the supply air temperature of the first air outlet, the second air outlet, and the third air outlet, and adjusts the supply air temperature of each area to a target value by controlling the power of the first electric heater, the second electric heater, and the third electric heater respectively;

[0025] According to the proportion of air supply volume in each area, the opening of the first damper and the second damper of the electronic control unit is adjusted to ensure that the air supply volume in different areas reaches the target value;

[0026] The electronic control unit receives the air conditioning mode setting signal from the control panel, controls the state of the four-way reversing valve, and switches between cooling mode and heating mode;

[0027] In cooling mode, the minimum supply air temperature of each zone is set as the outlet air temperature target value of the first indoor heat exchanger; the maximum supply air temperature of each zone is set as the inlet air temperature target value of the first indoor heat exchanger;

[0028] In heating mode, the second maximum value of the supply air temperature in each zone is set as the outlet air temperature target value of the first indoor heat exchanger; the minimum value of the supply air temperature in each zone is set as the inlet air temperature target value of the first indoor heat exchanger.

[0029] Furthermore, the method further includes: pre-matching and designing the two heat exchangers according to relevant parameters under the designed operating conditions or actual operating conditions. The specific steps are as follows:

[0030] Obtain the actual operating conditions or designed operating conditions of the automobile zone air conditioner and obtain the user-set data under the corresponding operating conditions; for each set of operating conditions, calculate the target air supply temperature data of each air outlet, and arrange them from large to small as T1>T2>T3; combined with the inlet air temperature T in , the second indoor heat exchanger outlet air temperature T mid and the first indoor heat exchanger outlet air temperature T out By controlling the cooling capacity of the refrigeration system, the outlet air temperature of the first indoor heat exchanger reaches the minimum temperature T3 in the cooling mode, and the energy efficiency coefficient η is defined as:

[0031]

[0032] The outlet air temperature of the first indoor heat exchanger reaches the intermediate temperature value T2 in the heating mode, and the energy efficiency coefficient η is defined as:

[0033]

[0034] When the outlet air temperature of the second indoor heat exchanger is close to T1 in cooling mode and close to T3 in heating mode, the actual operating conditions are close to the ideal conditions, and the energy efficiency coefficient η approaches 1;

[0035] Divide the expected ambient temperature range into several areas according to the frequency of occurrence. <T env1 ,T env1 ~T env2 ,T env2 ~T env3 ,…,>T envn , according to the expected frequency of occurrence of each temperature range under actual operating conditions, a weight coefficient ω is assigned to it i ,ω i =Frequency of current temperature range working condition / total number of environmental working conditions; get the comprehensive energy efficiency based on weight coefficient under all working conditions:

[0036] η a =∑ω i η i

[0037] By adjusting the opening of the second throttling device, the cooling capacity distribution of the first indoor heat exchanger and the second indoor heat exchanger is adjusted so that the outlet air temperature of the second indoor heat exchanger is T mid The limit is always kept below T1, which can meet the air supply needs of all working conditions and achieve the highest system energy efficiency.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention discloses a heat pump air conditioning system with multi-temperature zone air supply and its control method. By pre-matching the dual heat exchangers (rationally designing the size, dimensions, and heat exchange capacity of the two heat exchangers) and implementing secondary throttling between the dual heat exchangers, three different air supply temperatures are achieved at the inlet, outlet, and intermediate section of the first and second indoor heat exchangers. Finally, further temperature adjustment is performed through electric heating, thereby achieving multi-temperature air supply. Compared to methods that perform varying degrees of secondary heating of a single cold air stream to achieve multiple air supply temperatures, this method ensures that the cooling capacity of the refrigeration system closely matches the cooling capacity required for air supply, significantly reduces the required electric heating power, and thus improves energy efficiency and reduces energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 This is a schematic diagram of a multi-temperature zone air conditioning and air supply system for an electric vehicle according to an embodiment of the present invention;

[0042] Figure 2This is a control diagram of a multi-temperature zone air conditioning and air supply system for an electric vehicle according to an embodiment of the present invention.

[0043] Among them: 1. Variable frequency compressor; 2. Exhaust pressure sensor; 3. Outdoor heat exchanger; 4. Regenerator; 51. First throttling device; 52. Second throttling device; 61. First indoor heat exchanger; 62. Second indoor heat exchanger; 7. Four-way reversing valve; 8. Liquid reservoir; 9. Variable frequency fan; 101. First damper; 102. Second damper; 111. First electric heater; 112. Second electric heater; 113. Third electric heater; 121. First temperature sensor; 122. Second temperature sensor; 123. Third temperature sensor; 124. Fourth temperature sensor; 125. Fifth temperature sensor; 131. First air outlet; 132. Second air outlet; 133. Third air outlet; 14. Electronic control unit; 15. Control panel. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0047] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is typically placed when in use. These terms are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0048] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only 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.

[0049] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0050] The present invention is described in further detail below with reference to the accompanying drawings:

[0051] See also Figure 1 The embodiment of the present invention discloses a heat pump air conditioning system with multi-temperature zone air supply, including a refrigeration system, an air supply system and an electronic control unit 14. The refrigeration system includes a variable frequency compressor 1, a liquid storage tank 8, an outdoor heat exchanger 3, a regenerator 4, a first throttling device 51, a first indoor heat exchanger 61, a second indoor heat exchanger 62 and a four-way reversing valve 7 connected by pipelines; the outlet of the regenerator 4 is respectively connected to the first throttling device 51 and the second indoor heat exchanger 62, and the outlet of the first throttling device 51 is connected to the first indoor heat exchanger 61; the first indoor heat exchanger 61 and the second indoor heat exchanger 62 are connected to the air supply system; the fan in the air supply system is sequentially connected to the second indoor heat exchanger 62 and the first indoor heat exchanger 61; the inlet of the first indoor heat exchanger 61 The wind is partially drawn out through the diverter damper 102 and then sent to the third air supply port 133. The air duct of the third air supply port 133 is equipped with a third electric heater 113. The outlet air of the first indoor heat exchanger 61 is divided by the diverter damper 101 and sent to the first air supply port 131 and the second air supply port 132 respectively. The air duct of the first air supply port 131 is equipped with a first electric heater 111, and the air duct of the second air supply port 132 is equipped with a second electric heater 112. The air supply ports (131-133) are connected to the corresponding temperature zones of the passenger compartment. The electric heaters (111-113) are arranged in the air duct to heat the supply air. Figure 2 The electronic control unit is electrically connected to the control panel 15, the variable frequency compressor 1, the four-way reversing valve 7, the fan, the first electric heater 111, the second electric heater 112, and the third electric heater 113. The control panel 15 is arranged in the passenger compartment and is connected to the electronic control unit 14 for inputting passenger setting data into the electronic control unit 14.

[0052] The refrigeration and air supply systems of this embodiment utilize a dual heat exchanger configuration to achieve dual inlet and outlet air temperature acquisition. These dual heat exchangers are pre-designed to meet actual application conditions and user data requirements, ensuring maximum outlet air temperature while fully utilizing the heat exchanger's capabilities. Furthermore, intermediate throttling controls the evaporation temperature, ensuring that the intermediate outlet air temperature of the heat exchanger meets air supply requirements, maximizing system performance. Furthermore, by leveraging the higher outlet air temperature distribution that cannot be achieved with electric heating, the system achieves the highest overall energy efficiency while ensuring dual air supply requirements.

[0053] In a feasible embodiment of the present invention, the refrigeration system also includes a second throttling device 52; the first throttling device 51 is located on the connecting pipe between the regenerator 4 and the first indoor heat exchanger 61; the second throttling device 52 is located on the connecting pipe between the regenerator 4 and the second indoor heat exchanger 62; the first throttling device 51 and the second throttling device 52 are both electrically connected to the electronic control unit 14, and the electronic control unit 14 can control the speed of the variable frequency compressor 1 and the opening of the first throttling device 51 and the second throttling device 52.

[0054] In one feasible embodiment of the present invention, a second damper 102 is provided at the inlet of the first indoor heat exchanger 61 for controlling the amount of air entering the third air supply port 133; the second damper 102 is electrically connected to the electronic control unit 14. A first damper 101 is provided at the branch point of the main pipeline connecting the first indoor heat exchanger 61 to the first air supply port 131 and the second air supply port 132, respectively, for controlling the amount of air entering the first air supply port 131 and the second air supply port 132; the first damper 101 is electrically connected to the electronic control unit 14.

[0055] In a feasible embodiment of the present invention, the refrigeration system further includes an exhaust pressure sensor 2 ; the exhaust pressure sensor 2 is located between the variable frequency compressor 1 and the four-way reversing valve 7 ; the exhaust pressure sensor 2 is electrically connected to the electronic control unit 14 .

[0056] In a feasible embodiment of the present invention, a first temperature sensor 121 is provided at the inlet of the first indoor heat exchanger 61; a second temperature sensor 122 is provided at the outlet of the first indoor heat exchanger 61; a third temperature sensor 123 is installed at the outlet of the first air supply port 131; a fourth temperature sensor 124 is installed at the outlet of the second air supply port 132; and a fifth temperature sensor 125 is installed at the outlet of the third air supply port. The first temperature sensor 121, the second temperature sensor 122, the third temperature sensor 123, the fourth temperature sensor 124, and the fifth temperature sensor 125 are all electrically connected to the electronic control unit 14. The temperature sensors are arranged in the air duct of the air supply system to detect the air temperature at each position;

[0057] In a feasible embodiment of the present invention, preferably, the fan is preferably a variable frequency fan 9; the refrigeration system uses carbon dioxide as a refrigerant, and realizes heat exchange with the air supplied by the air supply system through the first indoor heat exchanger 61 and the second indoor heat exchanger 62; heat exchange is performed between the high-pressure section and the low-pressure section of the regenerator 4;

[0058] The embodiment of the present invention discloses a control method for a heat pump air conditioning system with multi-temperature zone air supply, which specifically includes:

[0059] The control panel 15 reads the target temperature and air volume of each zone input by the user and sends them to the electronic control unit 14. The air temperature of each zone is determined based on the target temperature of each zone, and then the inlet and outlet air temperature target value of the first indoor heat exchanger 61 is determined.

[0060] The electronic control unit 14 receives the signal from the exhaust pressure sensor 2, detects the exhaust pressure of the variable frequency compressor 1, and controls the speed of the variable frequency compressor 1 to make the exhaust pressure reach the target value.

[0061] The electronic control unit 14 receives signals from the first temperature sensor 121 and the second temperature sensor 122, detects the inlet and outlet air temperatures of the first indoor heat exchanger 61, obtains the wind-side heat exchange amount according to the inlet and outlet target air temperatures and air volume of the first indoor heat exchanger 51, thereby determining the evaporation temperature of the refrigerant in the first indoor heat exchanger 61 and the second indoor heat exchanger 62, and controls the opening of the first throttling device 51 and the second throttling device so that the evaporation temperature of the refrigerant in the first indoor heat exchanger 61 and the second indoor heat exchanger 62 reaches the target value, thereby making the inlet and outlet air temperatures of the first indoor heat exchanger 61 reach the target value.

[0062] The sum of the air supply volumes of each area is taken as the total air supply volume of the air supply system, and the total air supply volume of the air supply system is controlled to reach the target value by controlling the variable frequency fan 9.

[0063] The electronic control unit 14 receives the supply air temperature setting value signal of each area of ​​the control panel 15, and receives the signals of the third temperature sensor 123, the fourth temperature sensor 124, and the fifth temperature sensor 125, detects the supply air temperature of the first air supply outlet 131, the second air supply outlet 132, and the third air supply outlet 133, and uses the supply air temperature as the control target to control the heating power of the first electric heater 111, the second electric heater 112, and the third electric heater 113, and adjusts the supply air temperature of the air supply outlet to the target value by changing the electric heating power.

[0064] The electronic control unit 14 receives the air supply volume signal of each area from the control panel 15, and adjusts the opening of the first damper 101 and the second damper 102 according to the air supply volume ratio of each area, so that the air supply volume of different areas reaches the target value.

[0065] The electronic control unit 14 receives the air conditioning mode setting signal from the control panel 15 and controls the state of the four-way reversing valve 7 to switch between the cooling mode and the heating mode.

[0066] It should be noted that the target outlet air temperature of the first indoor heat exchanger 61 is set to the minimum supply air temperature for each zone in cooling mode and the second-highest supply air temperature for each zone in heating mode. The target inlet air temperature of the first indoor heat exchanger 61 is set to the maximum supply air temperature for each zone in cooling mode and the minimum supply air temperature for each zone in heating mode.

[0067] It should be noted that, for each air supply route to the passenger compartment, the openings of the first air door 101 and the second air door 102 are determined according to the air volume required for each air supply route.

[0068] The opening degree of the first air door 101 is determined according to the ratio of the air volume required by the first air supply port 131 and the second air supply port 132 .

[0069] The opening degree of the second air door 102 is determined according to the proportion of the third air supply port 133 in the total air volume.

[0070] In summary, the present invention achieves multi-temperature air supply through dual heat exchanger air induction and temperature adjustment through electric heating. Compared with the method of performing different degrees of secondary heating on a single cold air, a method of obtaining air supply at multiple temperatures is achieved. Under this method, the cooling capacity of the refrigeration system is approximately matched with the cooling capacity required for air supply, and the required electric heating power is greatly reduced, thereby improving energy utilization efficiency and reducing energy waste. Calculation and analysis of the electric vehicle zoned air conditioning supply system provided by the present invention under typical operating conditions show that its energy consumption can be reduced by about 10% to 20% under the same conditions compared with electric heating. It has significant economic and environmental benefits, and has made significant contributions to environmental protection, alleviating the fossil energy crisis, and achieving carbon neutrality and carbon peak.

[0071] The working principle of the present invention is as follows:

[0072] The air supply system generates supply air through the variable frequency fan 9, and is connected to the first indoor heat exchanger 61 and the second indoor heat exchanger 62 for heat exchange. Part of the supply air is drawn out through the first damper 101 and the second damper 102 at the outlet and inlet of the first indoor heat exchanger 61 respectively. After the temperature is adjusted by electric heating, the required temperature supply air is finally obtained at the air supply port and sent into the corresponding area of ​​the passenger compartment through the air supply port.

[0073] Temperature sensors are respectively arranged at the air supply outlets of each area and the inlet and outlet of the first indoor heat exchanger 61 to detect the air supply temperature at the inlet and outlet of each air supply outlet and the first indoor heat exchanger 61 and send the detection results to the electronic control unit 14.

[0074] The electronic control unit 14 is used to determine the air temperature in each area based on the detection signal of the temperature sensor, and receive the signal from the control panel 15, input the control signal according to the preset control method, and achieve the matching of the air supply temperature and air supply volume in each area with the target signal of the control panel by controlling the refrigeration system and the air supply system.

[0075] In order to obtain the outlet air temperature that meets the actual operating conditions and improve the heat exchanger efficiency and the overall energy efficiency of the system, the two heat exchangers are pre-matched and designed according to the relevant parameters under the design conditions or actual operating conditions. The method is as follows:

[0076] The actual operating conditions or designed operating conditions of the automobile zone air conditioner are obtained by measuring the target environment, analyzing climate and driving data, and the user setting data under the corresponding operating conditions is obtained by analyzing user habit data. For each set of operating conditions, the target air supply temperature data of each air outlet is calculated based on the corresponding data, and arranged from large to small as T1>T2>T3, combined with the inlet air temperature T in , the outlet air temperature of the second indoor heat exchanger 62 is T mid , the outlet air temperature of the first indoor heat exchanger 61 is T out By controlling the cooling capacity of the refrigeration system, the outlet air temperature of the first indoor heat exchanger 61 reaches the minimum target air supply temperature T3 of each air supply outlet (the middle value T2 in heating mode), that is, T out ≈T3(cooling) or T out ≈T2(heating), define the energy efficiency coefficient η:

[0077]

[0078] When the mode is heating, the above formula becomes:

[0079]

[0080] When the outlet air temperature of the second indoor heat exchanger 62 is T mid When it is close to T1 (T3 in heating mode), the actual operating condition is close to the ideal condition, and the energy efficiency coefficient η approaches 1. According to the temperature limit and temperature difference limit of the outlet air temperature of the second indoor heat exchanger 62 required under each actual operating condition, by changing the parameters such as the size, structure, and number of flow channels of the first indoor heat exchanger 61 and the second indoor heat exchanger 62, the heat exchange capacity ratio of the two heat exchangers is changed, so that the outlet air temperature T of the second indoor heat exchanger 62 is met under different actual operating conditions or designed operating conditions. mid Do not exceed T1 (T3 in heating mode) and maximize the energy efficiency coefficient η.

[0081] By statistically analyzing the environmental parameters and user setting data under a large number of reference working conditions, the application environment and user condition bias of the automotive zone air conditioner are obtained. The possible ambient temperature range is divided into several areas according to the frequency of occurrence, such as " <T env1 ,T env1 ~T env2 ,T env2 ~T env3 ,…,>T envn ", according to the possible frequency of occurrence of each temperature range under actual operating conditions, a weight coefficient ω is assigned to it i , that is, ω i = Frequency of current temperature range working condition / total number of environmental working conditions. For different user settings under each environmental working condition, weighting is performed in the same way. Finally, the comprehensive energy efficiency based on the weight coefficient under all working conditions is obtained:

[0082] η a =∑ω i η i

[0083] Under the premise of meeting the intermediate outlet temperature limit of the heat exchanger and the outlet temperature difference limit of the heat exchanger, the comprehensive energy efficiency of all working conditions is maximized, thereby obtaining the optimal heat exchanger matching design. At the same time, by adjusting the opening of the second throttling device 52, the cooling capacity distribution of the first indoor heat exchanger 61 and the second indoor heat exchanger 62 is adjusted so that the outlet air temperature T mid The limit is always kept below T1, which means that the air supply needs of all working conditions can be met, while at the same time the required electric heating power is reduced as much as possible, making the system energy efficient.

[0084] The four-way reversing valve 7 is used to switch the working mode of the refrigeration system. It has two states, corresponding to the cooling mode and the heating mode respectively.

[0085] The air supply system supplies air to the passenger compartment in each direction, controls the refrigeration system according to the target temperature, so that the air inlet and outlet of the first indoor heat exchanger 61 reaches a temperature close to the preset temperature, and adjusts the temperature through electric heating.

[0086] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A heat pump air conditioning system with multi-temperature zone air supply, characterized in that: include: A refrigeration system, comprising a variable frequency compressor (1), a liquid accumulator (8), an outdoor heat exchanger (3), a regenerator (4) and a four-way reversing valve (7); four interfaces of the four-way reversing valve (7) are respectively connected to the variable frequency compressor (1), the outdoor heat exchanger (3), the regenerator (4) and the liquid accumulator (8); the variable frequency compressor (1) and the liquid accumulator (8) are also directly connected via a pipeline; the outdoor heat exchanger (3) and the regenerator (4) are also directly connected via a pipeline; the outlet of the regenerator (4) is respectively connected to a first throttling device (51) and a second indoor heat exchanger (62); the outlet of the first throttling device (51) is connected to the first indoor heat exchanger (61); the first indoor heat exchanger (61) and the second indoor heat exchanger (62) are connected to an air supply system; An air supply system, comprising a fan, a first air supply port (131), a second air supply port (132) and a third air supply port (133); the air generated by the fan passes through the second indoor heat exchanger (62) and the first indoor heat exchanger (61) in sequence; the inlet of the first indoor heat exchanger (61) is connected to the third air supply port (133), and a third electric heater (113) is provided in the air duct of the third air supply port (133); the outlet of the first indoor heat exchanger (61) is respectively connected to the first air supply port (131) and the second air supply port (132); the first electric heater (111) is provided in the air duct of the first air supply port (131), and the second electric heater (112) is provided in the air duct of the second air supply port (132); An electric control unit (14) is electrically connected to a control panel (15), a variable frequency compressor (1), a four-way reversing valve (7), a fan, a first electric heater (111), a second electric heater (112), and a third electric heater (113). The electric control unit (14) is used to control the inlet and outlet air temperatures of the first indoor heat exchanger (61) and the second indoor heat exchanger (62) according to a target temperature input by the control panel (15), and then perform secondary heating through the first electric heater (111), the second electric heater (112), and the third electric heater (113), so as to finally reach a preset target temperature value for each area.

2. A heat pump air conditioning system with multi-temperature zone air supply according to claim 1, characterized in that: The refrigeration system further includes a second throttling device (52); the second throttling device (52) is located on the connecting pipe between the regenerator (4) and the second indoor heat exchanger (62); and the first throttling device (51) and the second throttling device (52) are both electrically connected to the electronic control unit (14).

3. The heat pump air conditioning system with multi-temperature zone air supply according to claim 1, characterized in that: A second damper (102) is provided at the inlet of the first indoor heat exchanger (61) for controlling the air volume entering the third air supply port (133); the second damper (102) is electrically connected to the electronic control unit (14).

4. The heat pump air conditioning system with multi-temperature zone air supply according to claim 1, characterized in that: A first damper (101) is provided at a branch point of a pipeline main line connecting the first indoor heat exchanger (61) to the first air supply port (131) and the second air supply port (132), respectively, for controlling the amount of air entering the first air supply port (131) and the second air supply port (132); the first damper (101) is electrically connected to an electronic control unit (14).

5. The heat pump air conditioning system with multi-temperature zone air supply according to claim 1, characterized in that: The refrigeration system further comprises an exhaust pressure sensor (2); the exhaust pressure sensor (2) is located between the variable frequency compressor (1) and the four-way reversing valve (7); and the exhaust pressure sensor (2) is electrically connected to the electronic control unit (14).

6. The heat pump air conditioning system with multi-temperature zone air supply according to claim 1, characterized in that: A first temperature sensor (121) is provided at the inlet of the first indoor heat exchanger (61); a second temperature sensor (122) is provided at the outlet of the first indoor heat exchanger (61); a third temperature sensor (123) is installed at the air outlet of the first air supply port (131); a fourth temperature sensor (124) is installed at the air outlet of the second air supply port (132); and a fifth temperature sensor (125) is installed at the air outlet of the third air supply port; the first temperature sensor (121), the second temperature sensor (122), the third temperature sensor (123), the fourth temperature sensor (124) and the fifth temperature sensor (125) are all electrically connected to the electronic control unit (14).

7. The heat pump air conditioning system with multi-temperature zone air supply according to claim 1, characterized in that: The fan is a variable frequency fan (9).

8. The heat pump air conditioning system with multi-temperature zone air supply according to claim 1, characterized in that: The refrigerant used in the refrigeration system is carbon dioxide.

9. A control method for a heat pump air conditioning system with multi-temperature zone air supply according to any one of claims 2 to 8, characterized in that: The following steps are involved: The target temperature and air supply volume of each zone are transmitted to the electric control unit (14) through the control panel (15), and the target air supply temperature of each zone is determined according to the target temperature of each zone, thereby determining the inlet and outlet air temperatures of the first indoor heat exchanger (61) and the second indoor heat exchanger (62); The electronic control unit (14) receives a signal from the exhaust pressure sensor (2), detects the exhaust pressure of the variable frequency compressor (1), and controls the speed of the variable frequency compressor (1) so that the exhaust pressure reaches a target value; The electronic control unit (14) receives signals from the first temperature sensor (121) and the second temperature sensor (122) to detect the inlet and outlet air temperatures of the first indoor heat exchanger (61); obtains the air-side heat exchange amount according to the target inlet and outlet air temperatures and air volumes of the first indoor heat exchanger (61) and the second indoor heat exchanger (62), thereby determining the evaporation temperature of the refrigerant in the first indoor heat exchanger (61) and the second indoor heat exchanger (62); and controls the opening of the first throttling device (51) and the second throttling device (52) so that the evaporation temperature of the refrigerant in the first indoor heat exchanger (61) and the second indoor heat exchanger (62) reaches the target value, thereby making the inlet and outlet air temperatures of the first indoor heat exchanger (61) reach the target value; The sum of the air supply volumes of each area is taken as the total air supply volume of the air supply system, and the total air supply volume of the air supply system is controlled to reach a target value by controlling the variable frequency fan (9); The electric control unit (14) receives signals from the third temperature sensor (123), the fourth temperature sensor (124), and the fifth temperature sensor (125), detects the air supply temperature of the first air supply port (131), the second air supply port (132), and the third air supply port (133), and adjusts the air supply temperature of each area to a target value by controlling the power of the first electric heater (111), the second electric heater (112), and the third electric heater (113); According to the proportion of air supply volume in each area, the opening of the first air door (101) and the second air door (102) of the electric control unit (14) is adjusted so that the air supply volume in different areas reaches the target value; The air conditioning mode setting signal from the control panel (15) is received by the electronic control unit (14), and the state of the four-way reversing valve (7) is controlled to realize the switching between the cooling mode and the heating mode; In cooling mode, the minimum air supply temperature of each zone is set as the outlet air temperature target value of the first indoor heat exchanger (61); the maximum air supply temperature of each zone is set as the inlet air temperature target value of the first indoor heat exchanger (61); In the heating mode, the second maximum value of the air supply temperature in each area is set as the outlet air temperature target value of the first indoor heat exchanger (61); and the minimum value of the air supply temperature in each area is set as the inlet air temperature target value of the first indoor heat exchanger (61).

10. The control method of a heat pump air conditioning system with multi-temperature zone air supply according to claim 9, characterized in that: Also includes: According to the relevant parameters under the design operating conditions or actual operating conditions, the two heat exchangers are pre-matched and designed. The specific steps are as follows: Obtain the actual operating conditions or designed operating conditions of the automobile partition air conditioner and obtain the user setting data under the corresponding operating conditions; for each set of operating conditions, calculate the target air supply temperature data of each air supply outlet, and arrange them from large to small as T1>T2>T3; combine the inlet air temperature T of the second indoor heat exchanger (62) in , the outlet air temperature of the second indoor heat exchanger (62) T mid and the outlet air temperature T of the first indoor heat exchanger (61) out By controlling the cooling capacity of the refrigeration system, the outlet air temperature of the first indoor heat exchanger (61) reaches the minimum temperature T3 in the cooling mode, and the energy efficiency coefficient η is defined as: The outlet air temperature of the first indoor heat exchanger (61) reaches the intermediate temperature value T2 in the heating mode, and the energy efficiency coefficient η is defined as: When the outlet air temperature of the second indoor heat exchanger (62) is close to T1 in cooling mode and close to T3 in heating mode, the actual operating condition is close to the ideal condition, and the energy efficiency coefficient η approaches 1; Divide the expected ambient temperature range into several areas according to the frequency of occurrence. <T env1 ,T env1 ~T env2 ,T env2 ~T env3 ,…,>T envn , according to the expected frequency of occurrence of each temperature range under actual operating conditions, a weight coefficient ω is assigned to it i ,ω i =Frequency of current temperature range working condition / total number of environmental working conditions; get the comprehensive energy efficiency based on weight coefficient under all working conditions: or a =∑ωη i By adjusting the opening of the second throttling device (52), the cooling capacity distribution of the first indoor heat exchanger (61) and the second indoor heat exchanger (62) is adjusted so that the outlet air temperature T mid The limit is always kept below T1, which can meet the air supply needs of all working conditions and achieve the highest system energy efficiency.

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