Vehicle air conditioning unit and control method thereof

Abstract

The present invention relates to the field of vehicle air conditioning technology, and specifically provides a vehicle air conditioning unit and a control method thereof, aiming to solve the problems of high energy consumption and short life of vehicle batteries in existing vehicle air conditioning units. To this end, the refrigerant circulation circuit of the vehicle air conditioning unit of the present invention is provided with a condenser, a throttling component, an evaporator and a compressor, the vehicle exterior unit includes a housing and a vehicle exterior fan, the housing is provided with an air outlet, a first air inlet and a second air inlet, the second air inlet is located on the air flow path during vehicle driving, the air outlet is connected to one end of a heat exchange channel in the housing, and the first air inlet and the second air inlet are configured to be selectively connected to the other end of the heat exchange channel. Based on this, the present invention controls the connection state of the first air inlet and the second air inlet with the heat exchange channel according to the displacement speed of the vehicle, so as to fully utilize the air passing through the housing during vehicle driving to exchange heat with the condenser, reduce energy consumption, and ensure the service life of the vehicle battery.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle-mounted air conditioners, and specifically provides a vehicle-mounted air conditioner unit and a control method thereof. Background Art

[0002] Most vehicles are equipped with onboard air conditioning units to regulate the temperature and humidity inside the vehicle, providing a more comfortable riding environment, reducing driver fatigue, and ensuring driving safety. However, when the onboard air conditioning unit is used while driving, the vehicle battery is constantly discharging and charging, which can shorten the battery life. Furthermore, the high operating power of existing onboard air conditioners can lead to excessive energy consumption in the vehicle, all of which can result in a poor user experience.

[0003] Accordingly, the art requires a new vehicle air-conditioning unit and a control method thereof to solve the above problems. Summary of the Invention

[0004] The present invention aims to solve the above technical problems, that is, to solve the problems of high energy consumption and short life of vehicle batteries in existing vehicle air-conditioning units.

[0005] In a first aspect, the present invention provides a control method for a vehicle-mounted air-conditioning unit, the vehicle-mounted air-conditioning unit comprising an indoor unit, an outdoor unit, and a refrigerant circulation loop arranged between the indoor unit and the outdoor unit, the outdoor unit comprising a casing and an outdoor fan, a heat exchange channel being formed in the casing, a condenser, a throttling component, an evaporator, and a compressor being sequentially arranged on the refrigerant circulation loop, the evaporator being located in the indoor unit, the condenser and the outdoor fan being arranged in the heat exchange channel, an air outlet, a first air inlet, and a second air inlet being further provided on the casing, the air outlet being connected to one end of the heat exchange channel, the second air inlet being located on the airflow path during vehicle driving, and the first air inlet and the second air inlet being arranged to be selectively connected to the other end of the heat exchange channel, the control method comprising: obtaining a displacement speed of the vehicle; and controlling the connectivity between the first air inlet and the second air inlet and the heat exchange channel according to the displacement speed of the vehicle.

[0006] In the preferred technical solution of the above-mentioned control method, the step of "controlling the connection status of the first air inlet and the second air inlet with the heat exchange channel according to the displacement speed of the vehicle" includes: if the displacement speed of the vehicle is greater than or equal to the preset displacement speed, controlling the second air inlet to be connected with the heat exchange channel.

[0007] In a preferred technical solution of the above control method, the control method further includes: controlling the external fan to stop running when the second air inlet is connected to the heat exchange channel.

[0008] In the preferred technical solution of the above-mentioned control method, the step of "controlling the connection state of the first air inlet and the second air inlet with the heat exchange channel according to the displacement speed of the vehicle" also includes: if the displacement speed of the vehicle is less than the preset displacement speed, controlling the first air inlet to be connected with the heat exchange channel.

[0009] In a preferred technical solution of the above control method, the control method further includes: controlling the operation of the external fan when the first air inlet is connected to the heat exchange channel.

[0010] In the preferred technical solution of the above control method, the preset displacement speed is 20 km / h.

[0011] In the preferred technical solution of the above-mentioned control method, the control method also includes: when the second air inlet is connected to the heat exchange channel, obtaining the changes in the temperature of the evaporator and the temperature inside the vehicle; and selectively controlling the first air inlet to be connected to the heat exchange channel according to the changes in the temperature of the evaporator and the temperature inside the vehicle.

[0012] In the preferred technical solution of the above-mentioned control method, the step of "selectively controlling the first air inlet to be connected to the heat exchange channel according to changes in the temperature of the evaporator and the temperature inside the vehicle" specifically includes: when the vehicle-mounted air-conditioning unit is operating in a cooling condition, if the temperature of the evaporator is greater than a preset cooling temperature, and / or the decrease in the temperature inside the vehicle does not reach a preset decrease, then controlling the first air inlet to be connected to the heat exchange channel; when the vehicle-mounted air-conditioning unit is operating in a heating condition, if the temperature of the evaporator is lower than a preset heating temperature, and / or the increase in the temperature inside the vehicle does not reach a preset increase, then controlling the first air inlet to be connected to the heat exchange channel.

[0013] In the preferred technical solution of the above-mentioned control method, when the second air inlet is connected to the heat exchange channel, the control method also includes: when the vehicle-mounted air-conditioning unit is operating in a cooling condition, if the temperature of the evaporator is less than or equal to the preset cooling temperature and the decrease in the temperature inside the vehicle reaches the preset decrease, then the second air inlet is maintained in connection with the heat exchange channel; when the vehicle-mounted air-conditioning unit is operating in a heating condition, if the temperature of the evaporator is greater than or equal to the preset heating temperature and the increase in the temperature inside the vehicle reaches the preset increase, then the second air inlet is maintained in connection with the heat exchange channel.

[0014] On the other hand, the present invention further provides a vehicle-mounted air-conditioning unit, which includes a controller capable of executing the control method described in any one of the above-mentioned preferred technical solutions.

[0015] When the above technical solution is adopted, the vehicle-mounted air-conditioning unit of the present invention selectively connects the first air inlet and the second air inlet with the heat exchange channel according to the displacement speed of the vehicle. While ensuring the operational stability of the vehicle-mounted air-conditioning unit, it can also make full use of the natural flow of air passing through the casing during the vehicle's driving to exchange heat with the condenser, thereby reducing the frequency of use of the external fan, thereby effectively reducing the number of charge and discharge times of the vehicle-mounted battery, achieving the purpose of protecting the vehicle-mounted battery and extending its service life, and can also effectively reduce the energy consumption of the vehicle-mounted air-conditioning unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0017] Figure 1 It is a structural schematic diagram of the vehicle air-conditioning unit of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the vehicle exterior unit of the present invention;

[0019] Figure 3 2 is a schematic structural diagram of the vehicle exterior unit of the present invention when it is in active air supply mode;

[0020] Figure 4 2 is a schematic structural diagram of the vehicle exterior unit of the present invention when in natural air supply mode;

[0021] Figure 5 It is a flow chart of the main steps of the control method of the present invention;

[0022] Figure 6 is a flowchart of the specific steps of a preferred embodiment of the control method of the present invention;

[0023] Reference numerals:

[0024] 1. Outdoor unit;

[0025] 11. Casing; 111. Air outlet; 112. First air inlet; 113. Second air inlet;

[0026] 12. External fan;

[0027] 13. Shielding member; 131. Rotating member; 132. First engaging structure; 133. Second engaging structure; 134. Locking member;

[0028] 14. Temperature sensor; 15. Controller; 16. Baffle;

[0029] 2. Refrigerant circulation circuit;

[0030] 21. Condenser; 22. Throttling component; 23. Evaporator; 24. Compressor; 25. Four-way valve. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific applications. For example, the present invention does not impose any restrictions on the specific application objects of the vehicle-mounted air-conditioning unit. It can be applied to gasoline vehicles, electric vehicles, and plug-in hybrid vehicles. Technicians can set the application objects of the vehicle-mounted air-conditioning unit according to actual usage requirements. Such changes in specific application objects do not deviate from the principles of the present invention and still fall within the scope of protection of the present invention.

[0032] It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," "front," and "back" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or component described 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Although the various steps of the compressor frequency control method of the present invention are described in this application in a specific order, these orders are not restrictive. Without deviating from the basic principles of the present invention, those skilled in the art can perform the steps in different orders.

[0034] See first Figure 1 and 2 , Figure 1 It is a structural diagram of the vehicle air-conditioning unit of the present invention, Figure 2 Schematic diagram of the structure of the vehicle exterior unit of the present invention. Figure 1 and 2As shown, the vehicle air conditioning unit of the present invention includes an in-vehicle unit (not shown), an outdoor unit 1, and a refrigerant circulation circuit 2 disposed between the in-vehicle unit and the outdoor unit 1. The outdoor unit 1 includes a housing 11 and an outdoor fan 12. A heat exchange channel is formed in the housing 11. The refrigerant circulation circuit 2 is sequentially provided with a condenser 21, a throttling member 22, an evaporator 23, a compressor 24, and a four-way valve 25. The evaporator 23 is located in the in-vehicle unit, and the condenser 21 and the outdoor fan 12 are disposed in the heat exchange channel. The housing 11 is also provided with an air outlet 111, a first air inlet 112, and a second air inlet 113. The air outlet 111 is connected to one end of the heat exchange channel. The second air inlet 113 is located in the airflow path during vehicle travel. The first air inlet 112 and the second air inlet 113 are configured to selectively connect to the other end of the heat exchange channel. Based on the above-mentioned setting method, the vehicle-mounted air-conditioning unit of the present invention can make full use of the natural flow of air passing through the casing 11 during the vehicle's driving to facilitate heat exchange for the condenser 21, thereby reducing the frequency of use of the external fan 12, and thus effectively reducing the number of charge and discharge times of the vehicle-mounted battery, thereby achieving the purpose of protecting the vehicle-mounted battery and extending its service life, and can also effectively reduce the energy consumption of the vehicle-mounted air-conditioning unit, providing users with a good user experience.

[0035] It should be noted that the present invention does not impose any restrictions on the specific structure of the in-car unit, nor does it impose any restrictions on the specific types and specific structures of the condenser 21, the throttling component 22, the evaporator 23 and the compressor 24. The condenser 21 and the evaporator 23 can be coil heat exchangers, fin heat exchangers, or shell and tube heat exchangers; the throttling component 22 can be a throttling capillary or an electronic expansion valve. This is not restrictive. As long as the on-board air-conditioning unit can achieve heat exchange through the in-car unit, the outdoor unit 1 and the refrigerant circulation loop 2 arranged between the in-car unit and the outdoor unit 1, technicians can set it themselves according to actual usage.

[0036] Furthermore, it should be noted that the present invention does not impose any restrictions on the specific shape of the housing 11. It can be circular, square, or irregular, and technicians can customize it based on actual usage. As a preferred configuration, the shape of the housing 11 is determined by the specific location of the off-board unit 1 in the vehicle to more efficiently utilize the vehicle's space.

[0037] As a specific embodiment, the exterior unit 1 further includes a shielding member 13. The shielding member 13 is configured to be movable between the first air inlet 112 and the second air inlet 113 so that either the first air inlet 112 or the second air inlet 113 can be connected to the other end of the heat exchange channel. It should be noted that the present invention does not impose any restrictions on the specific structure or shape of the shielding member 13. As long as the shielding member 13 can enable either the first air inlet 112 or the second air inlet 113 to be connected to the other end of the heat exchange channel, technicians can customize the structure based on actual usage.

[0038] Preferably, the shielding member 13 is rotatably connected to the housing 11, and a portion of the housing 11 can be rotated by the shielding member 13 to open or close the second air inlet 113. Specifically, a rotating member 131 is provided at the connection between the shielding member 13 and the housing 11 to enable the shielding member 13 to be rotatably moved between the first air inlet 112 and the second air inlet 113. Of course, the present invention does not impose any restrictions on the specific structure of the rotating member 131. It can be a rotating hinge structure or a rotating spring structure, which is not restrictive. Technicians can set it according to the actual rotation of the shielding member 13.

[0039] Further preferably, the shielding member 13 is further provided with a first engaging structure 132 and a second engaging structure 133. The first engaging structure 132 can engage with the first air inlet 112 to seal the first air inlet 112, and the second engaging structure 133 can engage with the second air inlet 113 to seal the second air inlet 113. It should be noted that the present invention does not impose any restrictions on the specific structure and shape of the first engaging structure 132 and the second engaging structure 133. The first engaging structure 132 and the second engaging structure 133 can be shielding plates or shielding blocks, which are not restrictive. Technicians can set the first engaging structure 132 and the second engaging structure 133 according to the actual shielding situation.

[0040] As a specific embodiment, the first joint structure 132 and the second joint structure 133 are both shielding plates, so as to effectively ensure the sealing of the first air inlet 112 and the second air inlet 113, and effectively ensure that when the heat exchange channel is connected to the second air inlet 113, the first air inlet 112 will not leak air, thereby effectively reducing the frequency of use of the external fan 12 and ensuring the service life of the vehicle battery. At the same time, it can also effectively reduce the energy consumption of the vehicle air-conditioning unit and enhance the user experience.

[0041] Furthermore, one end of the first engaging structure 132 and one end of the second engaging structure 133 are connected to form an obtuse angle, so that the shielding member 13 can selectively shield the first air inlet 112 and the second air inlet 113. Of course, the present invention does not impose any restrictions on the specific angle formed between the first engaging structure 132 and the second engaging structure 133. Technicians can set the angle between the first engaging structure 132 and the second engaging structure 133 according to actual engagement conditions.

[0042] Further preferably, one end of the second coupling structure 133 away from the first coupling structure 132 is connected to the rotating member 131. During the rotation of the second coupling structure 133, the first coupling structure 132 rotates with the second coupling structure 133 to realize the opening or closing of the first air inlet 112 and the second air inlet 113.

[0043] Furthermore, in this preferred embodiment, a locking member 134 is provided at one end of the portion of the housing 11 that rotates with the shielding member 13, away from the rotating member 131. The locking member 134 can lock the housing 11 that rotates with the shielding member 13, thereby sealing the second air inlet 113. It should be noted that the present invention does not impose any limitations on the specific structure of the locking member 134. The locking member 134 can be a magnetic locking structure or a snap-on locking structure, which is not restrictive and can be configured by a skilled person based on actual locking requirements.

[0044] Furthermore, the external fan 12 is configured to be turned on only when the first air inlet 112 is connected to the heat exchange channel, so that the vehicle-mounted air-conditioning unit can make full use of the natural flow of air passing through the casing 11 during the vehicle's driving to exchange heat with the condenser 21, thereby reducing the frequency of use of the external fan 12, thereby effectively reducing the number of charge and discharge times of the vehicle-mounted battery, achieving the purpose of protecting the vehicle-mounted battery and extending its service life, and can also effectively reduce the energy consumption of the vehicle-mounted air-conditioning unit, providing users with a good user experience.

[0045] Furthermore, in this preferred embodiment, a first air inlet 112 is positioned on the side of the housing 11, and a second air inlet 113 is positioned at the top of the housing 11. The second air inlet 113 forms an angle with the vehicle's direction of travel, effectively utilizing the natural flow of air through the housing 11 during travel, thereby effectively protecting the vehicle's battery and reducing energy consumption of the vehicle air conditioning unit. Furthermore, two first air inlets 112 are positioned on either side of the housing 11 to effectively exchange heat with the condenser 21.

[0046] It should be noted that the present invention does not impose any restrictions on the specific number and location of the air outlet 111, the first air inlet 112, and the second air inlet 113. Furthermore, the present invention does not impose any restrictions on the specific structure and shape of the air outlet 111, the first air inlet 112, and the second air inlet 113. The air outlet 111, the first air inlet 112, and the second air inlet 113 can have a mesh structure or a single hole-like structure. This is not restrictive and can be set by technicians based on actual usage.

[0047] Furthermore, the condenser 21 and the external fan 12 are sequentially arranged in the heat exchange channel along the direction of the heat exchange airflow, with the external fan 12 located near the air outlet 111 to effectively ensure the heat exchange effect of the heat exchange channel on the condenser 21, thereby effectively reducing the energy consumption of the vehicle air conditioning unit, protecting the vehicle battery, and ensuring the service life of the vehicle battery. Of course, the present invention does not impose any restrictions on the specific location of the condenser 21 and the external fan 12. The condenser 21 and the external fan 12 can also be located in other positions within the external unit 1, and technicians can set them according to actual usage.

[0048] In addition, in this preferred embodiment, the outdoor unit 1 also includes a temperature sensor 14 and a controller 15. The temperature sensor 14 can sense the temperature of the condenser 21, and the controller 15 can control the operating state of the on-board air-conditioning unit, for example, controlling the frequency of the compressor 24, the speed and operating state of the outdoor fan 12, etc. Specifically, the temperature sensor 14 is located in the condenser 21, and the controller 15 is located near the compressor 24. Of course, the specific location of the temperature sensor 14 and the controller 15 is not restrictive. It can be understood by those skilled in the art that the present invention does not impose any restrictions on the specific structure and model of the controller 15, and the controller 15 can be the original controller of the on-board air-conditioning unit, or it can be a controller separately set for executing the compressor frequency control method of the present invention. The technician can set the structure and model of the controller 15 according to actual use requirements.

[0049] Furthermore, the outdoor unit 1 also includes a baffle 16, one end of the baffle 16 is connected to the rotating member 131, and the other end is connected to the casing 11 to isolate the compressor 24 and the controller 15, thereby effectively preventing the air in the heat exchange channel from affecting the service life of the compressor 24 and the controller 15.

[0050] In this preferred embodiment, the vehicle air conditioning unit includes an active air supply mode and a natural air supply mode. Based on the specific structure of the above vehicle air conditioning unit, the working principles of the active air supply mode and the natural air supply mode of the vehicle air conditioning unit are as follows:

[0051] First, see Figure 3 , Figure 3 This is a schematic diagram of the structure of the vehicle exterior unit of the present invention when it is in active air supply mode. Figure 3 As shown, in the active air supply mode, the locking member 134 is in a closed state, the second coupling structure 133 and part of the housing 11 jointly cover the second air inlet 113, and the first coupling structure 132 and the first air inlet 112 are in a separated state. The air of the outdoor unit 1 can enter the heat exchange channel from the first air inlet 112 to exchange heat with the condenser 21. At this time, the outdoor fan 12 is in working state, and the air after heat exchange is drawn out by the outdoor fan 12 to the air outlet 111, and then discharged to the outside of the vehicle.

[0052] Next, see Figure 4 , Figure 4 Schematic diagram of the structure of the vehicle exterior unit of the present invention when it is in natural air supply mode. Figure 4 As shown, in the natural air supply mode, the locking member 134 is in the open state, allowing the partial housing 11 to rotate clockwise with the shielding member 13 under the rotation of the rotating member 131. The partial housing 11 and the second engaging structure 133 rotate to open the second air inlet 113. At the same time, the first engaging structure 132 rotates to the first air inlet 112 and just covers the first air inlet 112. At this time, the external fan 12 is in the closed state. During the vehicle's driving, the naturally flowing air enters the heat exchange channel through the second air inlet 113 to exchange heat with the condenser 21. The heat-exchanged air is then discharged to the outside of the vehicle through the holes in the external fan 12 and the air outlet 111.

[0053] Based on the setting mode in which the above-mentioned vehicle-mounted air-conditioning unit can switch between active air supply mode and natural air supply mode, when the active air supply mode is not needed, the external fan 12 is in the off state, and the vehicle-mounted air-conditioning unit can make full use of the natural flow of air passing through the casing 11 during the vehicle's driving to facilitate heat exchange for the condenser 21, thereby reducing the frequency of use of the external fan 12, thereby effectively reducing the number of charge and discharge times of the vehicle-mounted battery, achieving the purpose of protecting the vehicle-mounted battery and extending the service life of the vehicle-mounted battery, and can also effectively reduce the energy consumption of the vehicle-mounted air-conditioning unit, providing users with a good user experience.

[0054] See next Figure 5 , Figure 5 This is a flow chart of the main steps of the control method of the present invention. Figure 5 As shown, based on the vehicle air conditioning unit described in the above embodiment, the control method of the present invention mainly includes the following steps:

[0055] S1: Get the displacement speed of the vehicle;

[0056] S2: Controlling the connection between the first air inlet and the second air inlet and the heat exchange channel according to the displacement speed of the vehicle.

[0057] First, in step S1, the displacement speed of the vehicle is obtained. It should be noted that the present invention does not impose any restrictions on the specific method of obtaining the displacement speed. The displacement speed can be obtained based on a vehicle speed detector set on the vehicle, or it can be obtained by calculation based on the actual running time and running distance of the vehicle. This is not restrictive.

[0058] Next, in step S2, the connectivity between the first and second air inlets 112, 113 and the heat exchange channel is controlled based on the displacement speed of the vehicle. It should be noted that the present invention does not impose any restrictions on the specific method for determining the connectivity between the first and second air inlets 112, 113 and the heat exchange channel based on the displacement speed. The method can be determined based on a comparison of the displacement speed with a preset displacement speed, or by comparing the displacement speed with other introduced parameters, such as the temperature of the evaporator 23, through a mathematical calculation formula. These are not restrictive and can be determined by technicians based on actual circumstances.

[0059] Next see Figure 6 , Figure 6 1 is a flow chart of the specific steps of a preferred embodiment of the control method of the present invention. Figure 6 As shown, based on the vehicle air conditioning unit described in the above preferred embodiment, the preferred embodiment of the control method of the present invention specifically includes the following steps:

[0060] S101: Obtain the displacement speed of the vehicle;

[0061] S102: If the displacement speed of the vehicle is greater than or equal to a preset displacement speed, controlling the second air inlet to communicate with the heat exchange channel;

[0062] S103: Control the external fan to stop running;

[0063] S104: If the displacement speed of the vehicle is less than a preset displacement speed, controlling the first air inlet to communicate with the heat exchange channel;

[0064] S105: Control the operation of the external fan;

[0065] S106: Obtaining changes in the evaporator temperature and the vehicle interior temperature;

[0066] S107: If the temperature of the evaporator is greater than the preset cooling temperature, or the decrease in the temperature inside the vehicle does not reach the preset decrease, controlling the first air inlet to communicate with the heat exchange channel;

[0067] S108: If the temperature of the evaporator is less than or equal to the preset cooling temperature, and the decrease in the temperature inside the vehicle reaches the preset decrease, maintaining the second air inlet in communication with the heat exchange channel;

[0068] S109: If the temperature of the evaporator is lower than the preset heating temperature, or the increase in the temperature inside the vehicle does not reach the preset increase, controlling the first air inlet to communicate with the heat exchange channel;

[0069] S110: If the temperature of the evaporator is greater than or equal to the preset heating temperature, and the increase in the temperature inside the vehicle reaches the preset increase, the second air inlet is maintained in communication with the heat exchange channel.

[0070] In steps S101 to S105, first, the displacement speed of the vehicle is obtained. It should be noted that the present invention does not impose any restrictions on the method of obtaining the displacement speed. It can be obtained based on the vehicle speed detector set by the vehicle, or it can be obtained by calculation based on the actual running time and running distance of the vehicle. This is not restrictive. Then, the connection state between the first air inlet 112 and the second air inlet 113 and the heat exchange channel is controlled according to the displacement speed. It should be noted that the present invention does not impose any restrictions on the specific judgment method of controlling the connection state between the first air inlet 112 and the second air inlet 113 and the heat exchange channel according to the displacement speed, and it can be judged by comparing the size or ratio of the displacement speed with the preset displacement speed, or it can be judged by combining the displacement speed with other introduced parameters, such as the temperature of the evaporator 23, through a mathematical calculation formula. This is not restrictive and technicians can set it according to actual circumstances.

[0071] Specifically, to more intuitively and quickly determine the connectivity between the first and second air inlets 112, 113 and the heat exchange passage, a preferred configuration is to control the second air inlet 113 to communicate with the heat exchange passage if the displacement speed is greater than or equal to a preset displacement speed, thereby placing the vehicle air conditioning unit in natural air supply mode. Simultaneously, when the second air inlet 113 is connected to the heat exchange passage, the controller 15 controls the external fan 12 to stop operating, allowing the vehicle to fully utilize the natural flow of air through the housing 11 during driving to exchange heat with the condenser 21. This reduces the frequency of external fan 12 usage, thereby effectively reducing the number of charge and discharge cycles of the vehicle battery, thereby protecting the battery and extending its service life, and effectively reducing the energy consumption of the vehicle air conditioning unit. On the contrary, if the displacement speed is less than the preset displacement speed, the first air inlet 112 is controlled to be connected to the heat exchange channel, that is, the vehicle-mounted air-conditioning unit is controlled to be in active air supply mode. At the same time, when the first air inlet 112 is connected to the heat exchange channel, the external fan 12 is controlled to continue to run to ensure the user's actual heat exchange needs.

[0072] It should be noted that the present invention does not impose any restrictions on the specific setting method of the preset displacement speed. As a preferred setting method, the preset displacement speed is 20 km / h, so as to effectively meet the user's usage needs, while effectively reducing the energy consumption of the vehicle-mounted air-conditioning unit and ensuring the service life of the vehicle-mounted battery. Of course, it can be set by the user according to his or her actual usage needs, or it can be set at the factory according to the actual operating parameters of the vehicle. This is not restrictive, and technicians can set it according to actual circumstances.

[0073] Furthermore, in step S106, while the second air inlet 113 is in communication with the heat exchange channel, the temperature of the evaporator 23 and the changes in the vehicle interior temperature are continuously acquired. Based on the changes in the temperature of the evaporator 23 and the changes in the vehicle interior temperature, the first air inlet 112 is selectively controlled to be in communication with the heat exchange channel. Of course, the present invention does not impose any limitations on the specific method for acquiring the changes in the temperature of the evaporator 23 and the changes in the vehicle interior temperature. For example, the changes in the temperature of the evaporator 23 and the changes in the vehicle interior temperature can be acquired based on the average values ​​of the temperatures measured by a temperature sensor installed in the vehicle over different time periods, or based on the real-time temperature in the vehicle. Preferably, the changes in the temperature of the evaporator 23 and the changes in the vehicle interior temperature are acquired based on the real-time temperature in the vehicle, so that the operating state of the vehicle air conditioning unit can be adjusted in a timely and effective manner, thereby effectively reducing the energy consumption of the vehicle air conditioning unit and ensuring the service life of the vehicle battery.

[0074] Specifically, in steps S107 and S108, when the vehicle air conditioning unit is in the cooling mode, if the temperature of the evaporator 23 is greater than the preset cooling temperature or the decrease in the vehicle interior temperature does not reach the preset decrease, the first air inlet 112 is controlled to be connected to the heat exchange channel. Of course, if the temperature of the evaporator 23 is greater than the preset cooling temperature and the decrease in the vehicle interior temperature does not reach the preset decrease, the first air inlet 112 can also be controlled to be connected to the heat exchange channel. This is not restrictive and can be set by technicians according to actual conditions. Preferably, when the temperature of the evaporator 23 and the decrease in the vehicle interior temperature both meet the requirements, the first air inlet 112 is controlled to be connected to the heat exchange channel so that the vehicle air conditioning unit can be in the natural air supply mode for a longer period of time to reduce energy consumption. On the other hand, if the temperature of the evaporator 23 is less than or equal to the preset cooling temperature and the decrease in the vehicle interior temperature reaches the preset decrease, the second air inlet 113 is maintained in communication with the heat exchange channel.

[0075] Furthermore, in steps S109 and S110, when the vehicle air conditioning unit is in the heating mode, if the temperature of the evaporator 23 is less than the preset heating temperature or the increase in the vehicle interior temperature does not reach the preset increase, the first air inlet 112 is controlled to communicate with the heat exchange channel to better ensure the heat exchange effect. Of course, if the temperature of the evaporator 23 is less than the preset heating temperature and the increase in the vehicle interior temperature does not reach the preset increase, the first air inlet 112 can also be controlled to communicate with the heat exchange channel. Of course, this is not restrictive and can be set by technicians based on actual circumstances. Preferably, when the temperature of the evaporator 23 and the increase in the vehicle interior temperature both meet the requirements, the first air inlet 112 is controlled to communicate with the heat exchange channel so that the vehicle air conditioning unit can remain in the natural air supply mode for a longer period of time to reduce energy consumption. On the other hand, if the temperature of the evaporator 23 is greater than or equal to the preset heating temperature and the increase in the vehicle interior temperature reaches the preset increase, the second air inlet 113 is maintained in communication with the heat exchange channel.

[0076] It should be noted that the present invention does not impose any restrictions on the specific setting methods of the preset cooling temperature, the preset heating temperature, the preset reduction range, and the preset increase range. These can be set by the user or based on the actual operating conditions of the vehicle air conditioning unit and the vehicle. Preferably, the preset cooling temperature and the preset heating temperature are both 20°C. This is not restrictive and technicians can set them according to actual conditions.

[0077] In addition, it should be noted that the present invention does not impose any restrictions on the specific method of determining the connectivity status of the first air inlet 112 and the second air inlet 113 with the heat exchange channel. It can be determined only by the displacement speed of the vehicle, or it can be determined jointly by the displacement speed of the vehicle, the temperature of the evaporator 23 and the change in the temperature inside the vehicle; preferably, it is determined jointly by the displacement speed of the vehicle, the temperature of the evaporator 23 and the change in the temperature inside the vehicle, so as to further and more effectively reduce energy consumption and ensure the service life of the vehicle battery while ensuring the stable operation of the vehicle air-conditioning unit.

[0078] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A control method for a vehicle air-conditioning unit, characterized in that: The vehicle air conditioning unit includes an in-vehicle unit, an out-vehicle unit, and a refrigerant circulation circuit provided between the in-vehicle unit and the out-vehicle unit. The off-board unit includes a housing and an off-board fan, wherein a heat exchange channel is formed in the housing. The refrigerant circulation loop is sequentially provided with a condenser, a throttling component, an evaporator and a compressor, the evaporator is located in the in-vehicle unit, the condenser and the outdoor fan are provided in the heat exchange channel, The housing is further provided with an air outlet, a first air inlet, and a second air inlet. The air outlet is connected to one end of the heat exchange channel, and the second air inlet is located on the air flow path during the vehicle's driving process. The first air inlet and the second air inlet are configured to selectively connect to the other end of the heat exchange channel. The control method includes: Get the displacement speed of the vehicle; Controlling the communication state between the first air inlet and the second air inlet and the heat exchange channel according to the displacement speed of the vehicle, the steps comprising: if the displacement speed of the vehicle is greater than or equal to a preset displacement speed, controlling the second air inlet to communicate with the heat exchange channel; When the second air inlet is in communication with the heat exchange channel, obtaining changes in the temperature of the evaporator and the temperature inside the vehicle; Selectively controlling the first air inlet to communicate with the heat exchange channel according to changes in the temperature of the evaporator and the temperature inside the vehicle, the steps comprising: When the vehicle-mounted air-conditioning unit operates in a cooling condition, if the temperature of the evaporator is greater than a preset cooling temperature and / or the drop in the temperature inside the vehicle does not reach a preset drop, the first air inlet is controlled to be connected to the heat exchange channel. When the first air inlet is connected to the heat exchange channel, the external fan is controlled to operate.

2. The control method according to claim 1, characterized in that: The control method further includes: When the second air inlet is connected to the heat exchange channel, the external fan is controlled to stop running.

3. The control method according to claim 1, wherein: The step of “controlling the communication state between the first air inlet and the second air inlet and the heat exchange channel according to the displacement speed of the vehicle” further includes: If the displacement speed of the vehicle is less than the preset displacement speed, the first air inlet is controlled to communicate with the heat exchange channel.

4. The control method according to any one of claims 1 to 3, characterized in that: The preset displacement speed is 20 km / h.

5. The control method according to claim 1, characterized in that: The step of “selectively controlling the first air inlet to communicate with the heat exchange channel according to changes in the temperature of the evaporator and the temperature inside the vehicle” specifically includes: When the vehicle air-conditioning unit operates in a heating condition, if the temperature of the evaporator is lower than a preset heating temperature and / or the increase in the temperature inside the vehicle does not reach a preset increase, the first air inlet is controlled to communicate with the heat exchange channel.

6. The control method according to claim 5, characterized in that: When the second air inlet is connected to the heat exchange channel, the control method further includes: When the vehicle air conditioning unit operates in a cooling mode, if the temperature of the evaporator is less than or equal to the preset cooling temperature and the decrease in the vehicle interior temperature reaches the preset decrease, maintaining the second air inlet in communication with the heat exchange channel; When the vehicle air-conditioning unit operates in a heating condition, if the temperature of the evaporator is greater than or equal to the preset heating temperature and the increase in the vehicle interior temperature reaches the preset increase, the second air inlet is maintained in communication with the heat exchange channel.

7. A vehicle air conditioning unit, characterized in that: The vehicle air conditioning unit includes a controller capable of executing the control method according to any one of claims 1 to 6.

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