Vehicle-mounted air conditioning unit and frequency control method of variable frequency compressor thereof

Abstract

The present application relates to the technical field of vehicle air conditioner, and particularly provides a vehicle air conditioner unit and a frequency control method of a variable frequency compressor thereof, aiming at solving the problems of high energy consumption and short service life of vehicle battery of the existing vehicle air conditioner unit. For this purpose, the vehicle air conditioner unit is provided with a condenser, a throttling component, an evaporator and a variable frequency compressor on a refrigerant circulation loop, and an outdoor unit includes a casing and an outdoor fan, the casing is provided with an air outlet, a first air inlet and a second air inlet, the air outlet is in communication with one end of a heat exchange channel in the casing, the first air inlet and the second air inlet are arranged to be selectively in communication with the other end of the heat exchange channel, and based on this, the frequency of the variable frequency compressor is adjusted according to the rotating speed of the outdoor fan when the first air inlet and the second air inlet are respectively in communication with the heat exchange channel, so as to effectively reduce the energy consumption, ensure the service life of the vehicle battery, and also ensure that the temperature of the evaporator will not fluctuate too much, and improve the stability of the operation of the vehicle air conditioner unit.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vehicle-mounted air conditioners, and particularly provides a vehicle-mounted air conditioner unit and a frequency control method of a variable frequency compressor thereof. BACKGROUND

[0002] Most existing vehicles are equipped with vehicle-mounted air conditioner units to adjust the temperature and humidity in the vehicle, thereby providing a more comfortable driving environment for users, and reducing the fatigue of the driver to ensure driving safety. However, when the user uses the vehicle-mounted air conditioner unit during driving, the vehicle-mounted battery will be in a state of continuous discharge and charge, which can shorten the service life of the vehicle-mounted battery. In addition, the existing vehicle-mounted air conditioner has a large running power, which can also cause high energy consumption of the vehicle, which brings a poor user experience.

[0003] Correspondingly, there is a need for a new vehicle-mounted air conditioner unit and a frequency control method of a variable frequency compressor thereof to solve the above problems. SUMMARY

[0004] The present application aims to solve the above technical problems, i.e., to solve the problems of high energy consumption of the existing vehicle-mounted air conditioner unit and short service life of the vehicle-mounted battery.

[0005] In a first aspect, the present application provides a frequency control method of a variable frequency compressor of a vehicle-mounted air conditioner unit, the vehicle-mounted air conditioner 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 passage being formed in the casing, the refrigerant circulation loop comprising, in sequence, a condenser, a throttling member, an evaporator, and a variable frequency compressor, the evaporator being located in the indoor unit, the condenser and the outdoor fan being arranged in the heat exchange passage, the casing further comprising an air outlet, a first air inlet, and a second air inlet, the air outlet being in communication with one end of the heat exchange passage, the second air inlet being located on an air flow path during vehicle driving, and the first air inlet and the second air inlet being arranged to be selectively in communication with the other end of the heat exchange passage, the frequency control method of the variable frequency compressor comprising: obtaining the rotational speed of the outdoor fan before switching and the rotational speed of the outdoor fan after switching when the vehicle-mounted air conditioner unit is switched from a state in which the first air inlet is in communication with the heat exchange passage to a state in which the second air inlet is in communication with the heat exchange passage; and adjusting the frequency of the variable frequency compressor according to the rotational speed of the outdoor fan before switching and the rotational speed of the outdoor fan after switching.

[0006] In the preferred technical scheme of the frequency control method of the variable frequency compressor, the step of adjusting the frequency of the variable frequency compressor according to the difference between the rotational speed of the outdoor fan before switching and the rotational speed of the outdoor fan after switching comprises: calculating the difference between the rotational speed of the outdoor fan before switching and the rotational speed of the outdoor fan after switching; and determining the adjustment range of the frequency of the variable frequency compressor according to the numerical value of the difference between the rotational speed of the outdoor fan before switching and the rotational speed of the outdoor fan after switching.

[0007] In the preferred technical scheme of the frequency control method of the variable frequency compressor, the step of determining the adjustment range of the frequency of the variable frequency compressor according to the numerical value of the difference between the rotational speed of the outdoor fan before switching and the rotational speed of the outdoor fan after switching comprises: calculating the product of a first adjustment coefficient and the difference between the rotational speed of the outdoor fan before switching and the rotational speed of the outdoor fan after switching, which is the adjustment range of the frequency of the variable frequency compressor.

[0008] In the preferred technical scheme of the frequency control method of the variable frequency compressor, the frequency control method of the variable frequency compressor further comprises: obtaining the temperature of the evaporator before switching and the temperature of the evaporator after switching; and determining the adjustment range of the frequency of the variable frequency compressor in combination with the temperature of the evaporator before switching and the temperature of the evaporator after switching.

[0009] In the preferred technical scheme of the frequency control method of the variable frequency compressor, the step of determining the adjustment range of the frequency of the variable frequency compressor in combination with the temperature of the evaporator before switching and the temperature of the evaporator after switching comprises: calculating the difference between the rotational speed of the outdoor fan before switching and the rotational speed of the outdoor fan after switching, which is a first difference; calculating the difference between the temperature of the evaporator before switching and the temperature of the evaporator after switching, which is a second difference; and determining the adjustment range of the frequency of the variable frequency compressor according to the first difference and the second difference.

[0010] In the preferred technical scheme of the frequency control method of the variable frequency compressor, the step of determining the adjustment range of the frequency of the variable frequency compressor according to the first difference and the second difference comprises: calculating the sum of the product of a first adjustment coefficient and the first difference and the product of a second adjustment coefficient and the second difference, which is the adjustment range of the frequency of the variable frequency compressor.

[0011] In the preferred technical scheme of the frequency control method of the variable frequency compressor, the first adjustment coefficient is greater than the second adjustment coefficient.

[0012] In the preferred technical scheme of the frequency control method of the variable frequency compressor, the step of adjusting the frequency of the variable frequency compressor according to the rotational speed of the external fan before switching and the rotational speed of the external fan after switching further comprises: determining the adjustment direction of the frequency of the variable frequency compressor according to the size relationship between the rotational speed of the external fan before switching and the rotational speed of the external fan after switching.

[0013] In the preferred technical scheme of the frequency control method of the variable frequency compressor, the step of determining the adjustment direction of the frequency of the variable frequency compressor according to the size relationship between the rotational speed of the external fan before switching and the rotational speed of the external fan after switching specifically comprises: increasing the frequency of the variable frequency compressor if the rotational speed of the external fan before switching is greater than the rotational speed of the external fan after switching; and decreasing the frequency of the variable frequency compressor if the rotational speed of the external fan before switching is less than the rotational speed of the external fan after switching.

[0014] In another aspect, the application further provides a vehicle-mounted air conditioning unit, which comprises a controller capable of executing the frequency control method of the variable frequency compressor according to any one of the preferred technical schemes.

[0015] With the above technical scheme, the vehicle-mounted air conditioning unit can make full use of the natural flow of air through the casing during vehicle driving to facilitate heat exchange of the condenser, reduce the use frequency of the external fan, thereby effectively reducing the charge-discharge times of the vehicle-mounted battery, achieving the purposes of protecting the vehicle-mounted battery and prolonging the service life, and effectively reducing the energy consumption of the vehicle-mounted air conditioning unit. In addition, the vehicle-mounted air conditioning unit can adjust the frequency of the variable frequency compressor according to the rotational speed of the external fan when the first air inlet is in communication with the heat exchange channel and the rotational speed of the external fan when the second air inlet is in communication with the heat exchange channel, effectively ensuring that the temperature of the evaporator does not fluctuate greatly, thereby effectively improving the stability of the operation of the vehicle-mounted air conditioning unit. BRIEF DESCRIPTION OF DRAWINGS

[0016] The preferred embodiments of the application will be described below with reference to the accompanying drawings, in which:

[0017] Figure 1 is a structural schematic diagram of the vehicle-mounted air conditioning unit of the application;

[0018] Figure 2 is a structural schematic diagram of the external unit of the application;

[0019] Figure 3 is a structural schematic diagram of the external unit of the application in the active air supply mode;

[0020] Figure 4is a structural schematic view of the vehicle external machine in a natural air supply mode of the present application;

[0021] Figure 5 is a main step flow chart of the frequency control method of the variable frequency compressor of the present application;

[0022] Figure 6 is a specific step flow chart of the first preferred embodiment of the frequency control method of the variable frequency compressor of the present application;

[0023] Figure 7 is a specific step flow chart of the second preferred embodiment of the frequency control method of the variable frequency compressor of the present application;

[0024] Reference signs:

[0025] 1, vehicle external machine;

[0026] 11, machine shell; 111, air outlet; 112, first air inlet; 113, second air inlet;

[0027] 12, vehicle external fan;

[0028] 13, shielding member; 131, rotating member; 132, first engaging structure; 133, second engaging structure; 134, locking member;

[0029] 14, temperature sensor; 15, controller; 16, baffle;

[0030] 2, refrigerant circulation loop;

[0031] 21, condenser; 22, throttling member; 23, evaporator; 24, variable frequency compressor; 25, four-way valve. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application. Those skilled in the art can make adjustments to them as needed in order to adapt to specific application occasions. For example, the present application does not make any limitation on the specific application object of the vehicle-mounted air conditioning unit, which can be applied to oil cars, can be applied to electric cars, can also be applied to plug-in hybrid cars, and those skilled in the art can set the application object of the vehicle-mounted air conditioning unit according to the actual use demand. Such changes related to the specific application object do not deviate from the principles of the present application and still belong to the protection scope of the present application.

[0033] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer", "front", "back" and other terms indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, it should be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "communicated" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Although the steps of the frequency control method of the variable frequency compressor of the present application are described in a specific order in the present application, these orders are not limiting, and those skilled in the art can perform the steps in different orders without deviating from the basic principles of the present application.

[0035] First refer to Figure 1 and 2 , Figure 1 is a structural schematic diagram of the vehicle-mounted air conditioning unit of the present application, Figure 2 is a structural schematic diagram of the outdoor unit of the present application. As Figure 1 and 2As shown, the vehicle-mounted air conditioning unit of the present application comprises an indoor unit (not shown in the figure), an outdoor unit 1 and a refrigerant circulation loop 2 arranged between the indoor unit and the outdoor unit 1, the outdoor unit 1 comprises a casing 11 and an outdoor fan 12, the casing 11 is formed with a heat exchange passage, the refrigerant circulation loop 2 is sequentially provided with a condenser 21, a throttling member 22, an evaporator 23, a variable frequency compressor 24 and a four-way valve 25, the evaporator 23 is located in the indoor unit, and the condenser 21 and the outdoor fan 12 are arranged in the heat exchange passage. The casing 11 is further provided with an air outlet 111, a first air inlet 112 and a second air inlet 113, the air outlet 111 is in communication with one end of the heat exchange passage, the second air inlet 113 is located on the airflow path during the driving process of the vehicle, and the first air inlet 112 and the second air inlet 113 are arranged to be able to selectively communicate with the other end of the heat exchange passage. Based on the above arrangement, the vehicle-mounted air conditioning unit of the present application can make full use of the natural flowing air passing through the casing 11 during the driving process of the vehicle to exchange heat with the condenser 21, reduce the use frequency of the outdoor fan 12, and thus not only can effectively reduce the charging and discharging times of the vehicle-mounted battery, achieve the purpose of protecting the vehicle-mounted battery and prolonging the service life, but also can effectively reduce the energy consumption of the vehicle-mounted air conditioning unit, and provide users with a good use experience.

[0036] It should be noted that the present application does not make any limitation on the specific structure of the indoor unit, nor on the specific type and specific structure of the condenser 21, the throttling member 22, the evaporator 23 and the variable frequency compressor 24. The condenser 21 and the evaporator 23 can be a coil heat exchanger, a fin heat exchanger or a shell and tube heat exchanger; the throttling member 22 can be a throttling capillary tube or an electronic expansion valve, which is not limited, as long as the vehicle-mounted air conditioning unit can realize heat exchange through the indoor unit, the outdoor unit 1 and the refrigerant circulation loop 2 arranged between the indoor unit and the outdoor unit 1. The skilled person can set it according to the actual use.

[0037] In addition, it should also be noted that the present application does not make any limitation on the specific shape of the casing 11, which can be circular, square or irregular, and the skilled person can set it according to the actual use. As a preferred arrangement, the shape of the casing 11 is set according to the specific location of the outdoor unit 1 in the vehicle, so as to more effectively utilize the space of the vehicle.

[0038] As a specific implementation, the outdoor machine 1 further comprises a shielding member 13, which is arranged to be movable between the first air inlet 112 and the second air inlet 113 to enable the first air inlet 112 and the second air inlet 113 to be selectively communicated with the other end of the heat exchange channel. It should be noted that the present application does not make any limitation on the specific structure and specific shape of the shielding member 13, as long as the shielding member 13 can enable the first air inlet 112 and the second air inlet 113 to be selectively communicated with the other end of the heat exchange channel, and the skilled person can set it according to the actual use.

[0039] Preferably, the shielding member 13 is rotatably connected with the machine shell 11, and a part of the machine shell 11 can be rotated under the driving of the shielding member 13 to enable the second air inlet 113 to be opened or closed. Specifically, the connection between the shielding member 13 and the machine shell 11 is provided with a rotating member 131 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 application does not make any limitation on the specific structure of the rotating member 131, which can be a rotating hinge structure or a rotating spring structure, and this is not a limitation, and the skilled person can set it according to the actual rotation of the shielding member 13.

[0040] 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 application does not make any limitation on the specific structure and specific shape of the first engaging structure 132 and the second engaging structure 133, which can be a shielding plate or a shielding block, and this is not a limitation, and the skilled person can set it according to the actual shielding of the first engaging structure 132 and the second engaging structure 133.

[0041] As a specific implementation, the first engaging structure 132 and the second engaging 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, effectively ensure that the first air inlet 112 will not leak when the heat exchange channel is communicated with the second air inlet 113, thereby effectively reducing the use frequency of the outdoor fan 12, ensuring the service life of the vehicle-mounted battery, and also effectively reducing the energy consumption of the vehicle-mounted air conditioning unit and improving the user's experience.

[0042] Further, one end of the first joint structure 132 and one end of the second joint structure 133 are connected and 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 application does not limit the specific angle formed between the first joint structure 132 and the second joint structure 133, and the skilled person can set the angle between the first joint structure 132 and the second joint structure 133 according to the actual joint situation.

[0043] Further preferably, the end of the second joint structure 133 away from the first joint structure 132 is connected to the rotating member 131, and during the rotation of the second joint structure 133, the first joint structure 132 rotates with the second joint structure 133 to achieve the opening or closing of the first air inlet 112 and the second air inlet 113.

[0044] In addition, in the preferred embodiment, the end of the part of the shell 11 away from the rotating member 131 that rotates with the shielding member 13 is also provided with a locking member 134, which can lock the shell 11 that rotates with the shielding member 13 to achieve the closure of the second air inlet 113. It should be noted that the present application does not limit the specific structure of the locking member 134, which can be a magnetic locking structure or a clamping locking structure, which is not limiting, and the skilled person can set it according to the actual locking situation.

[0045] Further, the outdoor fan 12 is arranged to be turned on only when the first air inlet 112 is in communication with the heat exchange channel, so that the vehicle-mounted air conditioning unit can make full use of the natural flowing air through the shell 11 during vehicle driving to exchange heat with the condenser 21, reduce the use frequency of the outdoor fan 12, and thus not only effectively reduce the charge and discharge times of the vehicle-mounted battery, achieve the purpose of protecting the vehicle-mounted battery and prolonging the service life, but also effectively reduce the energy consumption of the vehicle-mounted air conditioning unit, providing users with a good use experience.

[0046] In addition, in the preferred embodiment, the first air inlet 112 is arranged on the side of the shell 11, the second air inlet 113 is arranged on the top of the shell 11, and the second air inlet 113 forms an angle with the direction of vehicle travel, so as to effectively utilize the natural flowing air through the shell 11 during vehicle driving, thereby effectively protecting the vehicle-mounted battery and reducing the energy consumption of the vehicle-mounted air conditioning unit. Further, the number of first air inlets 112 is two, and the two first air inlets 112 are arranged on both sides of the shell 11, so as to effectively exchange heat with the condenser 21.

[0047] It should be noted that the present application does not make any limitation on the specific number and setting position of the air outlet 111, the first air inlet 112 and the second air inlet 113. In addition, the present application also does not make any limitation on the specific structure and shape of the air outlet 111, the first air inlet 112 and the second air inlet 113, and the air outlet 111, the first air inlet 112 and the second air inlet 113 can be a net structure or a single hole structure, which is not limited, and the skilled in the art can set it according to the actual use.

[0048] Further, the condenser 21 and the outdoor fan 12 are sequentially arranged in the heat exchange channel along the direction of the heat exchange airflow, and the outdoor fan 12 is located near the air outlet 111, so as 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-mounted air conditioning unit, protecting the vehicle-mounted battery and ensuring the service life of the vehicle-mounted battery. Of course, the present application does not make any limitation on the specific setting position of the condenser 21 and the outdoor fan 12, and the condenser 21 and the outdoor fan 12 can also be located at other positions in the outdoor unit 1, and the skilled in the art can set it according to the actual use.

[0049] In addition, in the preferred embodiment, the outdoor unit 1 further comprises 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 vehicle-mounted air conditioning unit, such as the frequency of the variable frequency compressor 24, the rotating speed of the outdoor fan 12 and the like. Specifically, the temperature sensor 14 is located in the condenser 21, and the controller 15 is located near the variable frequency compressor 24, and of course, the specific setting position of the temperature sensor 14 and the controller 15 is not limited. It can be understood by those skilled in the art that the present application does not make any limitation on the specific structure and model of the controller 15, and the controller 15 can be the original controller of the vehicle-mounted air conditioning unit, or a controller separately arranged for the compressor frequency control method of the present application, and the skilled in the art can set the structure and model of the controller 15 according to the actual use demand.

[0050] Further, the outdoor unit 1 further comprises a baffle 16, one end of the baffle 16 is connected with the rotating member 131, and the other end is connected with the casing 11, so as to isolate the variable frequency compressor 24 and the controller 15, thereby effectively avoiding the influence of the air in the heat exchange channel on the service life of the variable frequency compressor 24 and the controller 15.

[0051] In the preferred embodiment, the vehicle-mounted air conditioning unit comprises an active air supply mode and a natural air supply mode, and based on the specific structure of the vehicle-mounted air conditioning unit, the working principles of the active air supply mode and the natural air supply mode of the vehicle-mounted air conditioning unit are as follows:

[0052] Firstly, referring to Figure 3 ,Figure 3 is a structural schematic diagram of the outdoor unit of the present application in the active air supply mode. As shown in the figure, in the active air supply mode, the locking member 134 is in the closed state, the second engagement structure 133 is jointly shielded with the partial casing 11 to the second air inlet 113, and the first engagement structure 132 is in the separated state with the first air inlet 112. 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 the working state, and the heat-exchanged air is extracted by the outdoor fan 12 to the air outlet 111 and then discharged to the outside. Figure 3

[0053] Next, refer to Figure 4 , Figure 4 is a structural schematic diagram of the outdoor unit of the present application in the natural air supply mode. As shown in the figure, in the natural air supply mode, the locking member 134 is in the open state, so that the partial casing 11 can rotate clockwise with the shielding member 13 under the rotating action of the rotating member 131. The partial casing 11 and the second engagement structure 133 rotate to open the second air inlet 113, and the first engagement structure 132 rotates to the first air inlet 112 and just shields the first air inlet 112. At this time, the outdoor fan 12 is in the closed state, and the naturally flowing air during the driving of the vehicle enters the heat exchange channel through the second air inlet 113 to exchange heat with the condenser 21. The heat-exchanged air is discharged to the outside through the air outlet 111 by the hole in the outdoor fan 12. Figure 4

[0054] Based on the above-mentioned setting mode of the vehicle-mounted air conditioning unit capable of switching between the active air supply mode and the natural air supply mode, when the active air supply mode is not needed, the outdoor fan 12 is in the closed state. The vehicle-mounted air conditioning unit can fully utilize the naturally flowing air passing through the casing 11 during the driving of the vehicle to exchange heat with the condenser 21, reduce the frequency of use of the outdoor fan 12, and thus effectively reduce the number of charging and discharging of the vehicle-mounted battery, achieve the purpose of protecting the vehicle-mounted battery and prolonging the service life of the vehicle-mounted battery, and effectively reduce the energy consumption of the vehicle-mounted air conditioning unit, providing a good user experience.

[0055] Next, refer to Figure 5 , Figure 5 is a main step flowchart of the frequency control method of the variable frequency compressor of the present application. As shown in the figure, based on the above-mentioned vehicle-mounted air conditioning unit, the frequency control method of the variable frequency compressor of the present application mainly includes the following steps: Figure 5

[0056] S1: obtaining the first rotating speed and the second rotating speed of the outdoor fan;

[0057] ​​​S2: Adjust the frequency of the variable frequency compressor according to the first rotation speed and the second rotation speed.

[0058] In steps S1 and S2, the controller 15 first acquires the first rotation speed and the second rotation speed of the outdoor fan 12, wherein the first rotation speed is the rotation speed of the outdoor fan 12 when the vehicle-mounted air conditioning unit is in the active air supply mode, i.e. the rotation speed when the driving motor is driven; the second rotation speed is the rotation speed of the outdoor fan 12 when the vehicle-mounted air conditioning unit is in the natural air supply mode, i.e. the rotation speed when the natural air is driven; then, after the vehicle-mounted air conditioning unit is switched from the active air supply mode to the natural air supply mode, the controller 15 adjusts the frequency of the variable frequency compressor 24 according to the first rotation speed and the second rotation speed, so as to effectively ensure that the temperature of the evaporator 23 does not fluctuate greatly, thereby effectively improving the stability of the operation of the vehicle-mounted air conditioning unit.

[0059] It should be noted that the present application does not make any limitation on the acquisition method of the first rotation speed and the second rotation speed, which can be acquired by setting a sensor on the outdoor fan 12, or can be acquired by calculating the wind speed of the outdoor fan 12, which is not limited, and the skilled person can set the acquisition method of the first rotation speed and the second rotation speed according to the actual situation.

[0060] In addition, it should also be noted that the present application does not make any limitation on the specific adjustment method of the variable frequency compressor 24, which can be adjusted by the difference between the first rotation speed and the second rotation speed, or can be adjusted by the ratio thereof, or can be adjusted by other calculation formula; in addition, it can be adjusted only by the first rotation speed and the second rotation speed, or other parameters such as the temperature of the evaporator 23 can be introduced, and the first rotation speed and the second rotation speed are adjusted together, which is not limited, and the skilled person can set it according to the actual situation.

[0061] First preferred embodiment

[0062] Reference Figure 6 , Figure 6 is the specific step flow chart of the first preferred embodiment of the variable frequency compressor frequency control method of the present application. As Figure 6 shown, based on the vehicle-mounted air conditioning unit described in the above preferred embodiment, the first preferred embodiment of the variable frequency compressor frequency control method of the present application specifically includes the following steps:

[0063] S101: Acquire the first rotation speed and the second rotation speed of the outdoor fan;

[0064] S102: Calculate the difference between the first rotation speed and the second rotation speed, denoted as the first difference;

[0065] S103: Calculate the product of the first adjustment coefficient and the first difference, which is the adjustment amplitude of the frequency of the variable frequency compressor;

[0066] S104: determining the adjustment direction of the frequency of the variable frequency compressor according to the size relationship between the first rotation speed and the second rotation speed;

[0067] S105: if the first rotation speed is greater than the second rotation speed, increasing the frequency of the variable frequency compressor;

[0068] S106: if the first rotation speed is less than the second rotation speed, decreasing the frequency of the variable frequency compressor.

[0069] Firstly, in step S101, the controller 15 obtains the first rotation speed and the second rotation speed of the external fan 12, wherein the first rotation speed is the rotation speed of the external fan 12 when the vehicle-mounted air conditioning unit is in the active air supply mode, i.e. the rotation speed when the driving motor is driven; and the second rotation speed is the rotation speed of the external fan 12 when the vehicle-mounted air conditioning unit is in the natural air supply mode, i.e. the rotation speed when the natural air is driven.

[0070] It should be noted that the present application does not make any limitation on the specific acquisition method of the first rotation speed and the second rotation speed, for example, it can be acquired by setting a sensor on the external fan 12, or it can be acquired by calculating the wind speed of the external fan 12, which is not limited, and the skilled person can set the acquisition method of the first rotation speed and the second rotation speed according to the actual situation, which does not deviate from the basic principle of the present application and belongs to the protection scope of the present application.

[0071] Then, after the vehicle-mounted air conditioning unit is switched from the active air supply mode to the natural air supply mode, in steps S102 and S103, the difference between the first rotation speed and the second rotation speed is calculated, which is recorded as the first difference, and the product of the first adjustment coefficient and the first difference is calculated, which is the adjustment amplitude of the frequency of the variable frequency compressor 24. It should be noted that the present application does not make any limitation on the specific value of the first adjustment coefficient, which can be determined according to the user's demand, or can be determined according to the actual operation of the vehicle-mounted air conditioning unit, and the skilled person can set it by himself.

[0072] In addition, it should be noted that after the adjustment amplitude of the frequency of the variable frequency compressor 24 is determined, the present application does not make any limitation on the specific adjustment direction of the frequency of the variable frequency compressor 24, for example, it can be confirmed according to the actual temperature of the condenser 21, or it can be confirmed according to the actual operation of the variable frequency compressor 24, which is not limited.

[0073] As a preferred setting mode, in steps S104 to S106, according to the size relationship between the first rotational speed and the second rotational speed, the adjustment direction of the frequency of the variable frequency compressor 24 is determined, so as to be able to more effectively ensure that the temperature fluctuation range of the evaporator 23 is not too large, and improve the stability of the operation of the vehicle-mounted air conditioning unit. Further, if the first rotational speed is greater than the second rotational speed, the frequency of the variable frequency compressor 24 is increased; on the contrary, if the first rotational speed is less than the second rotational speed, the frequency of the variable frequency compressor 24 is decreased, and the adjustment amplitude of the frequency of the variable frequency compressor 24 being specifically increased or decreased is determined according to step S103.

[0074] Second preferred embodiment

[0075] Referring to Figure 7 , Figure 7 is a specific step flow chart of the second preferred embodiment of the variable frequency compressor frequency control method of the present application. As shown in Figure 7 , based on the vehicle-mounted air conditioning unit described in the above preferred embodiment, the second preferred embodiment of the variable frequency compressor frequency control method of the present application specifically includes the following steps:

[0076] S201: obtaining the first rotational speed and the second rotational speed of the vehicle-mounted air conditioning unit;

[0077] S202: calculating the difference value of the first rotational speed and the second rotational speed, denoted as the first difference value;

[0078] S203: obtaining the first temperature and the second temperature of the evaporator;

[0079] S204: calculating the difference value of the first temperature and the second temperature, denoted as the second difference value;

[0080] S205: calculating the sum of the product of the first adjustment coefficient and the first difference value and the product of the second adjustment coefficient and the second difference value, that is, the adjustment amplitude of the frequency of the variable frequency compressor;

[0081] S206: according to the size relationship between the first rotational speed and the second rotational speed, determining the adjustment direction of the frequency of the variable frequency compressor;

[0082] S207: if the first rotational speed is greater than the second rotational speed, increasing the frequency of the variable frequency compressor;

[0083] S208: if the first rotational speed is less than the second rotational speed, decreasing the frequency of the variable frequency compressor.

[0084] Firstly, in steps S201 and S202, the controller 15 obtains a first rotating speed and a second rotating speed of the outdoor fan 12, wherein the first rotating speed is the rotating speed of the outdoor fan 12 when the vehicle air conditioning unit is in the active air supply mode, and the second rotating speed is the rotating speed of the outdoor fan 12 when the vehicle air conditioning unit is in the natural air supply mode. Then, after the vehicle air conditioning unit is switched from the active air supply mode to the natural air supply mode, the difference between the first rotating speed and the second rotating speed is calculated, which is recorded as a first difference. It should be noted that the present application does not make any limitation on the way of obtaining the first rotating speed and the second rotating speed, which can be obtained by setting a sensor on the outdoor fan 12, or can be obtained by calculating the wind speed of the outdoor fan 12, which is not limited, and the person skilled in the art can set the way of obtaining the first rotating speed and the second rotating speed according to the actual situation.

[0085] Further, in steps S203 and S204, a first temperature and a second temperature of the evaporator 23 are obtained, wherein the first temperature is the temperature of the evaporator 23 when the vehicle air conditioning unit is in the active air supply mode, and the second temperature is the temperature of the evaporator 23 when the vehicle air conditioning unit is in the natural air supply mode. Then, after the vehicle air conditioning unit is switched from the active air supply mode to the natural air supply mode, the difference between the first temperature and the second temperature is calculated, which is recorded as a second difference. It should be noted that the present application does not make any limitation on the specific way of obtaining the first temperature and the second temperature, which can be the average temperature of the evaporator 23 at different times when the vehicle air conditioning unit is in the active air supply mode and the natural air supply mode, respectively, or can be the instantaneous temperature before and after the evaporator 23 is switched from the active air supply mode to the natural air supply mode, which is not limited, and the person skilled in the art can set it according to the actual situation.

[0086] Further preferably, in step S205, the sum of the product of a first adjustment coefficient and the first difference and the product of a second adjustment coefficient and the second difference is calculated, which is the adjustment amplitude of the frequency of the variable frequency compressor 24. It should be noted that the present application does not make any limitation on the specific value of the first adjustment coefficient and the second adjustment coefficient, which can be determined according to the user's demand, or can be determined according to the actual operation of the vehicle air conditioning unit, and the person skilled in the art can set it. In addition, it should also be noted that the present application does not make any limitation on the size relationship of the first adjustment coefficient and the second adjustment coefficient, and the person skilled in the art can set it according to the actual use. As a preferred setting method, the first adjustment coefficient is greater than the second adjustment coefficient, so as to more effectively ensure that the temperature of the evaporator 23 will not fluctuate in a large range, thereby effectively improving the stability of the operation of the vehicle air conditioning unit.

[0087] Further, it should be noted that after determining the adjustment range of the frequency of the variable frequency compressor 24, the present application does not limit the specific adjustment direction of the frequency of the variable frequency compressor 24, for example, it can be determined according to the actual temperature of the condenser 21, or it can be determined according to the actual operation of the variable frequency compressor 24, which is not limited. As a preferred setting method, specifically, in steps S206 to S208, the adjustment direction of the frequency of the variable frequency compressor 24 is determined according to the size relationship between the first speed and the second speed, so as to more effectively ensure that the temperature fluctuation range of the evaporator 23 is not too large, and improve the stability of the operation of the vehicle-mounted air conditioning unit. Further, if the first speed is greater than the second speed, the frequency of the variable frequency compressor 24 is increased; otherwise, if the first speed is less than the second speed, the frequency of the variable frequency compressor 24 is decreased, and the adjustment range of the frequency of the variable frequency compressor 24 is specifically increased or decreased according to step S205.

[0088] It should be noted that the present application does not limit the specific adjustment method of the variable frequency compressor 24, which can be adjusted only by the first speed and the second speed of the outdoor fan 12, or can be adjusted by the first speed and the second speed of the outdoor fan 12 and the first temperature and the second temperature of the evaporator 23; preferably, adjusting the frequency of the variable frequency compressor 24 by the first speed and the second speed of the outdoor fan 12 and the first temperature and the second temperature of the evaporator 23 can more effectively ensure that the evaporator 23 does not produce a large range of temperature fluctuations, so as to further effectively ensure the stability of the operation of the vehicle-mounted air conditioning unit, and also effectively ensure that the vehicle-mounted air conditioning unit has low energy consumption, and ensures the service life of the vehicle-mounted battery.

[0089] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

Claims

1. A frequency control method for a variable frequency compressor in a vehicle-mounted air conditioning unit, characterized in that, The vehicle-mounted air conditioning unit includes an indoor unit, an outdoor unit, and a refrigerant circulation loop disposed between the indoor unit and the outdoor unit. The vehicle exterior unit includes a housing and an exterior fan, with a heat exchange channel formed within the housing. The refrigerant circulation loop is sequentially equipped with a condenser, a throttling component, an evaporator, and a variable frequency compressor. The evaporator is located in the vehicle's interior unit, while the condenser and the exterior fan are located in the heat exchange channel. The casing is also 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 in the airflow path during vehicle movement. The first air inlet and the second air inlet are configured such that one of them can be connected to the other end of the heat exchange channel. The frequency control method for the variable frequency compressor includes: When the vehicle air conditioning unit switches from a state where the first air inlet is connected to the heat exchange channel to a state where the second air inlet is connected to the heat exchange channel, the rotation speed of the external fan before the switch and the rotation speed of the external fan after the switch are obtained. The frequency of the variable frequency compressor is adjusted based on the rotational speed of the external fan before and after the switch. The steps include: If the speed of the external fan before switching is greater than the speed of the external fan after switching, then increase the frequency of the variable frequency compressor. If the speed of the external fan before switching is less than the speed of the external fan after switching, then the frequency of the variable frequency compressor is reduced.

2. The frequency control method for a variable frequency compressor according to claim 1, characterized in that, The step of "adjusting the frequency of the variable frequency compressor based on the speed of the external fan before and after the switch" includes: Calculate the difference between the rotational speed of the external fan before the switch and the rotational speed of the external fan after the switch; The adjustment range of the frequency of the variable frequency compressor is determined based on the difference between the rotational speed of the external fan before and after the switch.

3. The frequency control method for a variable frequency compressor according to claim 2, characterized in that, The step of "determining the adjustment range of the variable frequency compressor frequency based on the difference between the rotational speed of the external fan before and after the switch" specifically includes: The product of the first adjustment coefficient and the difference between the rotational speed of the external fan before and after the switch is the adjustment range of the frequency of the variable frequency compressor.

4. The frequency control method for a variable frequency compressor according to claim 1, characterized in that, The frequency control method for the variable frequency compressor also includes: Obtain the temperature of the evaporator before switching and the temperature of the evaporator after switching; The adjustment range of the frequency of the variable frequency compressor is determined by combining the temperature of the evaporator before and after the switching.

5. The frequency control method for a variable frequency compressor according to claim 4, characterized in that, The step of "determining the adjustment range of the variable frequency compressor frequency by combining the evaporator temperature before and after the switch" specifically includes: Calculate the difference between the rotational speed of the external fan before the switch and the rotational speed of the external fan after the switch, and record it as the first difference. Calculate the difference between the temperature of the evaporator before and after the switch, and record it as the second difference. The adjustment range of the frequency of the variable frequency compressor is determined jointly based on the first difference and the second difference.

6. The frequency control method for a variable frequency compressor according to claim 5, characterized in that, The step of "determining the adjustment range of the frequency of the variable frequency compressor based on the first difference and the second difference" specifically includes: The product of the first adjustment coefficient and the first difference, and the sum of the product of the second adjustment coefficient and the second difference, are the adjustment range of the frequency of the variable frequency compressor.

7. The frequency control method for a variable frequency compressor according to claim 6, characterized in that, The first adjustment coefficient is greater than the second adjustment coefficient.

8. A vehicle-mounted air conditioning unit, characterized in that, The vehicle-mounted air conditioning unit includes a controller, which is capable of executing the frequency control method of the variable frequency compressor as described in any one of claims 1 to 7.

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