A defrosting method and device for an electric vehicle heat pump air conditioner outdoor condenser

Abstract

The application discloses an outdoor condenser defrosting method of an electric vehicle heat pump air conditioner, and comprises the following steps: obtaining outdoor condenser outlet temperature information; obtaining outdoor environment temperature information; determining a frost formation level according to the outdoor condenser outlet temperature information and the outdoor environment temperature information; determining frost formation state information according to the frost formation level, the outdoor condenser outlet temperature information and a first preset condition; obtaining vehicle running state information; obtaining cooling fan running state information; obtaining vehicle charging state information; obtaining user operation behavior information; and defrosting according to the frost formation state information, the vehicle running state information, the cooling fan running state information, the vehicle charging state and the user operation behavior information. The application can accurately predict the frost formation condition of the outdoor condenser, reasonably implement the defrosting process, reduce the adverse effect of the frost formation of the outdoor condenser on the performance of the heat pump system, effectively reduce the electric energy consumption, and improve the cruising range and the riding comfort.

Description

Technical Field

[0001] This application relates to the field of intelligent vehicles, and more specifically, to a defrosting method and apparatus for the outdoor condenser of an electric vehicle heat pump air conditioner. Background Technology

[0002] When an electric vehicle heat pump system operates in heating mode, the outdoor condenser acts as a heat-absorbing element, exchanging heat with the outside air. In high-humidity, low-temperature environments, the outdoor condenser is prone to condensation and frosting. The thicker the frost layer, the worse the airflow, resulting in lower heat exchange efficiency of the outdoor condenser and potentially causing the heat pump system to fail. Therefore, to ensure the normal operation of the heat pump system, it is necessary to predict the degree of frosting based on the system's operating conditions and implement effective control strategies to switch system cycles and defrost the outdoor condenser. This is a pressing problem faced by those skilled in the art.

[0003] However, in the actual operation of vehicles, due to environmental uncertainties, the risk of frost cannot be completely eliminated by prediction alone in the existing technology. Summary of the Invention

[0004] To address the aforementioned technical problems, this application is proposed. Embodiments of this application provide a defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner, comprising:

[0005] Obtain outdoor condenser outlet temperature information;

[0006] Obtain outdoor ambient temperature information;

[0007] The frosting level is determined based on the outdoor condenser outlet temperature information and the outdoor ambient temperature information.

[0008] The frosting status information is determined based on the frosting level, the outdoor condenser outlet temperature information, and the first preset condition.

[0009] Obtain vehicle operating status information;

[0010] Obtain the operating status information of the cooling fan;

[0011] Obtain vehicle charging status information;

[0012] Obtain user action behavior information;

[0013] The frost information is based on the frost status information, the vehicle operating status information, the cooling fan operating status information, the vehicle charging status, and the user operation behavior.

[0014] Optionally, the frosting information based on the frosting status information, the vehicle operating status information, the cooling fan operating status information, the vehicle charging status, and the user operation behavior information includes:

[0015] The defrosting preparation program is invoked based on the second preset condition;

[0016] The charging defrosting implementation program is invoked based on the third preset condition;

[0017] The defrosting process will be terminated based on the fourth preset condition.

[0018] The defrosting state procedure is invoked based on the fifth preset condition.

[0019] Optionally, determining the frosting level based on the outdoor condenser outlet temperature information and the outdoor ambient temperature information includes:

[0020] When the difference between the outdoor condenser outlet temperature and the outdoor ambient temperature is less than or equal to XA(x), the frosting level is 0.

[0021] When the difference between the outdoor condenser outlet temperature and the outdoor ambient temperature is greater than XA(x) and less than or equal to XB(x), the frosting level is 1.

[0022] When the difference between the outdoor condenser outlet temperature and the outdoor ambient temperature is greater than XB(x) and less than or equal to XC(x), the frosting level is 2.

[0023] When the difference between the outdoor condenser outlet temperature and the outdoor ambient temperature is greater than XC(x), the frosting level is 3.

[0024] XA(x)=

[0025] {

[0026] XA1,x<=X1;

[0027] (XA2-XA1) / (X2-X1)*(x–X1)+XA1,X1 <x<=X2;(XA3-XA2) / (X3-X2)*(x-X2)+XA2,X2<x<=X3;XA3,x> X3

[0028] }

[0029] XB(x)=

[0030] {

[0031] XB1,x<=X1;

[0032] (XB2-XB1) / (X2-X1)*(x–X1)+XB1,X1 <x<=X2;(XB3-XB2) / (X3-X2)*(x-X2)+XB2,X2<x<=X3;XB3,x> X3

[0033] }

[0034] XC(x)=

[0035] {

[0036] XC1,x<=X1;

[0037] (XC2-XC1) / (X2-X1)*(x–X1)+XC1,X1 <x<=X2;(XC3-XC2) / (X3-X2)*(x-X2)+XC2,X2<x<=X3;XC3,x> X3

[0038] };

[0039] Wherein, X1, X2, and X3 are the outdoor ambient temperatures.

[0040] Optionally, determining the frosting status information based on the frosting level, the outdoor condenser outlet temperature information, and the first preset condition includes:

[0041] When the initial frosting level is 0 and the frosting pre-judgment timer exceeds 30 seconds, the current frosting state becomes frosted.

[0042] When the initial frosting state is frosted and the outdoor condenser outlet temperature is greater than or equal to 7 degrees Celsius, the current frosting state changes to unfrosted or defrosting complete.

[0043] Optionally, the frosting information based on the frosting status information, the vehicle operating status information, the cooling fan operating status information, the vehicle charging status, and the user operation behavior information includes:

[0044] When the outdoor ambient temperature is greater than or equal to -20 degrees Celsius and the frost level is greater than or equal to level 2, the defrosting preparation program is invoked.

[0045] In the defrost preparation program state, when the cooling fan stops and the charging gun is connected, the charging defrost program is invoked;

[0046] When the defrosting process reaches 600 seconds, the charging defrosting procedure is stopped.

[0047] During the charging defrosting procedure, the defrosting preparation procedure is invoked when the cooling fan is running or the charging gun is disconnected.

[0048] In the defrost preparation program state, when a manual defrost request is received and the vehicle is at a low speed, the manual defrost program is invoked.

[0049] Under the manual defrosting procedure, when the manual defrosting time reaches 600 seconds or the vehicle is not in the low-speed state, the defrosting preparation procedure is invoked.

[0050] In the defrosting preparation program state, when the air conditioner is turned off, the cooling fan stops, and the vehicle remains in the low speed state for 180 seconds, the parking defrosting program is invoked.

[0051] During the parking defrosting procedure, the procedure is stopped when the duration reaches 600 seconds.

[0052] Under the parking defrosting procedure, when the air conditioner is turned on, the cooling fan is running, or the vehicle is not in the low speed state, the defrosting preparation procedure is invoked.

[0053] The defrosting process is stopped when the outdoor ambient temperature is less than or equal to -22 degrees Celsius, or when the frost level is 0.

[0054] Optionally, when the vehicle speed is greater than or equal to 5 km / h and the duration is greater than or equal to 5 seconds, the vehicle is not in a low-speed state; when the speed is less than or equal to 1 km / h and the duration is greater than or equal to 5 seconds, the vehicle is in a low-speed state; when the speed is less than 5 km / h but greater than 1 km / h, the current state of the vehicle is the same as the previous vehicle speed state, and the initial vehicle speed state after the vehicle is powered on is the low-speed state.

[0055] Optionally, during the charging defrosting program, the manual defrosting program, or the shutdown defrosting program, the system cycle is switched to the defrosting cycle. The compressor speed is controlled by the low pressure of the system refrigerant, and the high-temperature and high-pressure gas discharged from the compressor is throttled through the indoor condenser and then passes through the outdoor condenser to complete the defrosting process.

[0056] According to another aspect of this application, a defrosting device for the outdoor condenser of an electric vehicle heat pump air conditioner is also provided, comprising:

[0057] The first temperature sensor is configured to acquire outdoor condenser outlet temperature information;

[0058] The second temperature sensor is configured to acquire outdoor ambient temperature information;

[0059] The frost level determination module is configured to determine the frost level based on the outdoor condenser outlet temperature information and the outdoor ambient temperature information.

[0060] The frost status information determination module is configured to determine frost status information based on the frost level, the outdoor condenser outlet temperature information, and a first preset condition.

[0061] The status information acquisition module is configured to acquire vehicle operating status information, cooling fan operating status information, vehicle charging status information, and user operation behavior information.

[0062] The defrosting module is configured to perform defrosting based on the frosting status information, the vehicle operating status information, the cooling fan operating status information, the vehicle charging status, and the user's operation behavior.

[0063] According to another aspect of this application, an electronic device is provided, comprising: a processor; and a memory storing computer program instructions, which, when executed by the processor, cause the processor to perform the defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner as described above.

[0064] According to another aspect of this application, a computer-readable medium is provided having computer program instructions stored thereon, which, when executed by a processor, cause the processor to perform the defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner as described above.

[0065] Compared with existing technologies, this application can accurately predict the frosting situation of the outdoor condenser and reasonably implement the defrosting process, reduce the adverse effects of outdoor condenser frosting on the performance of the heat pump system, effectively reduce power consumption, and improve driving range and passenger comfort. Attached Figure Description

[0066] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objectives, and beneficial effects of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0067] Figure 1 This is a flowchart of a defrosting method for an outdoor condenser of an electric vehicle heat pump air conditioner according to an embodiment of this application;

[0068] Figure 2 This is a schematic diagram illustrating the frosting level determination of the outdoor condenser defrosting method for an electric vehicle heat pump air conditioner according to an embodiment of this application.

[0069] Figure 3 This is a schematic diagram illustrating the calculation of the frosting level X-axis in the defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner according to an embodiment of this application.

[0070] Figure 4 This is a schematic diagram illustrating the parameters of a defrosting method for an outdoor condenser of an electric vehicle heat pump air conditioner according to an embodiment of this application.

[0071] Figure 5 This is a schematic diagram illustrating the frosting state and information determination of the defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner according to an embodiment of this application.

[0072] Figure 6This is a schematic diagram illustrating the defrosting condition determination and implementation of the defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner according to an embodiment of this application.

[0073] Figure 7 This is a block diagram of an electronic device according to an embodiment of this application. Detailed Implementation

[0074] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0075] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0076] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0077] Please refer to Figure 1 One embodiment of this application provides a defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner, comprising:

[0078] S110: Obtain outdoor condenser outlet temperature information.

[0079] S120: Obtain outdoor ambient temperature information.

[0080] S130: Determine the frost level based on the outdoor condenser outlet temperature information and the outdoor ambient temperature information.

[0081] When the air conditioning system starts running, the frost rating is calculated based on the outdoor condenser outlet temperature and the ambient temperature. For example, if the current outdoor condenser outlet temperature is -16℃ and the ambient temperature is -5℃, then the frost rating is 2.

[0082] S140: Determine the frost status information based on the frost level, the outdoor condenser outlet temperature information, and the first preset condition.

[0083] Frost Status and Information Determination: Based on the frost level calculated above, the outdoor condenser outlet temperature, and other information, the current frost status and frost information (level) of the system are comprehensively determined. If the above status is maintained for 30 seconds, the frost status is "frost has formed," and the frost information is level 2 as described above.

[0084] S150: Acquire vehicle operating status information, cooling fan operating status information, vehicle charging status information, and user operation behavior information.

[0085] S160: Based on the frosting status information, the vehicle operating status information, the cooling fan operating status information, the vehicle charging status, and the user operation behavior information, the frosting is refrosted.

[0086] Determining and implementing defrosting conditions: Based on information such as the current severity of frost, vehicle operating status, cooling fan operation, vehicle charging status, and user operation behavior, the defrosting process is carried out.

[0087] In this embodiment, the frosting information based on the frosting status information, the vehicle operating status information, the cooling fan operating status information, the vehicle charging status, and the user operation behavior information includes:

[0088] The defrosting preparation program is invoked based on the second preset condition;

[0089] The defrosting process includes the following steps: Determine whether the conditions for entering the "defrosting preparation state" are met, that is, the current ambient temperature is -5℃ and the frost information is level 2, which meets the requirements of condition 1, so enter the state.

[0090] The charging defrosting implementation program is invoked based on the third preset condition;

[0091] Determine whether the conditions for entering the "charging defrosting implementation state" are met, i.e., the charging gun is connected and the cooling fan is in a stopped state. If condition 7 is met, enter the state and implement the defrosting process.

[0092] The defrosting process will be terminated based on the fourth preset condition.

[0093] In the "Charging Defrosting Implementation State", if the cooling fan runs or the charging gun is disconnected, and condition 8 is met, the defrosting process will be stopped. Alternatively, in the "Charging Defrosting Implementation State", if the outdoor condenser outlet temperature is still below 7°C after 600 seconds, it indicates that the maximum defrosting time has been reached, and the process will enter the "Charging Defrosting Time Reached" state, stopping the defrosting process.

[0094] The defrosting state procedure is invoked based on the fifth preset condition.

[0095] In the "charging defrosting in progress" state, if the situation described in condition 8 does not occur, the outdoor condenser outlet temperature will gradually rise as the defrosting process proceeds. When it rises to 7°C, the frost information will change to 0, indicating that defrosting is complete and the system will enter the "defrosting not in progress" state. Alternatively, the system will enter the "defrosting not in progress" state after the charging gun is disconnected.

[0096] It should be noted that the above is only one example of indicating the defrosting behavior during charging. The manual defrosting and parking defrosting proposed in this invention are similar and will not be described in detail here, but should fall within the scope of protection.

[0097] Please refer to Figures 2-4 In one embodiment of this application, determining the frosting level based on the outdoor condenser outlet temperature information and the outdoor ambient temperature information includes:

[0098] When the difference between the outdoor condenser outlet temperature and the outdoor ambient temperature is less than or equal to XA(x), the frosting level is 0.

[0099] When the difference between the outdoor condenser outlet temperature and the outdoor ambient temperature is greater than XA(x) and less than or equal to XB(x), the frosting level is 1.

[0100] When the difference between the outdoor condenser outlet temperature and the outdoor ambient temperature is greater than XB(x) and less than or equal to XC(x), the frosting level is 2.

[0101] When the difference between the outdoor condenser outlet temperature and the outdoor ambient temperature is greater than XC(x), the frosting level is 3.

[0102] XA(x)=

[0103] {

[0104] XA1,x<=X1;

[0105] (XA2-XA1) / (X2-X1)*(x–X1)+XA1,X1 <x<=X2;

[0106] (XA3-XA2) / (X3-X2)*(x-X2)+XA2,X2 <x<=X3;

[0107] XA3,x>X3

[0108] }

[0109] XB(x)=

[0110] {

[0111] XB1,x<=X1;

[0112] (XB2-XB1) / (X2-X1)*(x–X1)+XB1,X1 <x<=X2;

[0113] (XB3-XB2) / (X3-X2)*(x-X2)+XB2,X2 <x<=X3;

[0114] XB3,x>X3

[0115] }

[0116] XC(x)=

[0117] {

[0118] XC1,x<=X1;

[0119] (XC2-XC1) / (X2-X1)*(x–X1)+XC1,X1 <x<=X2;

[0120] (XC3-XC2) / (X3-X2)*(x-X2)+XC2,X2 <x<=X3;

[0121] XC3,x>X3

[0122] };

[0123] Wherein, X1, X2, and X3 are the outdoor ambient temperatures.

[0124] In this embodiment, determining the frosting status information based on the frosting level, the outdoor condenser outlet temperature information, and the first preset condition includes:

[0125] When the initial frosting level is 0 and the frosting pre-judgment timer exceeds 30 seconds, the current frosting state becomes frosted.

[0126] When the initial frosting state is frosted and the outdoor condenser outlet temperature is greater than or equal to 7 degrees Celsius, the current frosting state changes to unfrosted or defrosting complete.

[0127] The defrosting control method of this application includes three parts: frosting level determination, frosting status and information determination, and defrosting condition determination and implementation.

[0128] Frost Level Determination: The severity of frost is determined based on factors such as the current ambient temperature and the outdoor condenser outlet temperature. Frost levels are divided into four grades: 0, 1, 2, and 3. 0 represents no frost, and 1 through 3 represent light frost, moderate frost, and heavy frost, respectively. The specific method for determining the frost level is as follows... Figure 2As shown. The general principle is to determine the difference between the ambient temperature and the outdoor condenser outlet temperature; the larger this difference, the more severe the frost formation. XA, XB, and XC are parameters related to the ambient temperature, and their calculation methods are as follows: Figure 3 As shown, the corresponding functions are as follows:

[0129] XA(x)=

[0130] {

[0131] XA1,x<=X1;

[0132] (XA2-XA1) / (X2-X1)*(x–X1)+XA1,X1 <x<=X2;

[0133] (XA3-XA2) / (X3-X2)*(x-X2)+XA2,X2 <x<=X3;

[0134] XA3,x>X3

[0135] }

[0136] XB(x)=

[0137] {

[0138] XB1,x<=X1;

[0139] (XB2-XB1) / (X2-X1)*(x–X1)+XB1,X1 <x<=X2;

[0140] (XB3-XB2) / (X3-X2)*(x-X2)+XB2,X2 <x<=X3;

[0141] XB3,x>X3

[0142] }

[0143] XC(x)=

[0144] {

[0145] XC1,x<=X1;

[0146] (XC2-XC1) / (X2-X1)*(x–X1)+XC1,X1 <x<=X2;

[0147] (XC3-XC2) / (X3-X2)*(x-X2)+XC2,X2 <x<=X3;

[0148] XC3,x>X3

[0149] }

[0150] The values ​​that the parameters can take in a function are as follows: Figure 4(Note: The values ​​shown may vary depending on the specific vehicle model and need to be obtained after calibration on the actual vehicle.)

[0151] Frost Status and Information Determination: Based on the frost level calculated above, outdoor condenser outlet temperature, and other information, the current system's frost status and frost information (level) are comprehensively determined. See below for details. Figure 5 :

[0152] in:

[0153] Condition a: The frost pre-judgment timer exceeds t1 (30s). Once this condition is met, the condenser is judged to have frost. Condition b: The outdoor condenser outlet temperature is ≥T1 (7℃). Once this condition is met, the condenser is judged to have not frost (including defrosting).

[0154] The calculation of the above frost pre-judgment timer:

[0155] Activation conditions: The previous frosting state was non-frosting and the frosting pre-judgment was successful.

[0156] Reset condition: The reset condition is met when the startup condition is not met.

[0157] The above calculations for the frost prediction are as follows:

[0158] The frost pre-judgment is valid only if the outdoor condenser outlet temperature is ≤ T2 (0℃); otherwise, it is not valid.

[0159] Please refer to Figure 6 In this embodiment, the frosting information based on the frosting status information, the vehicle operating status information, the cooling fan operating status information, the vehicle charging status, and the user operation behavior information includes:

[0160] When the outdoor ambient temperature is greater than or equal to -20 degrees Celsius and the frost level is greater than or equal to level 2, the defrosting preparation program is invoked.

[0161] In the defrost preparation program state, when the cooling fan stops and the charging gun is connected, the charging defrost program is invoked;

[0162] When the defrosting process reaches 600 seconds, the charging defrosting procedure is stopped.

[0163] During the charging defrosting procedure, the defrosting preparation procedure is invoked when the cooling fan is running or the charging gun is disconnected.

[0164] In the defrost preparation program state, when a manual defrost request is received and the vehicle is at a low speed, the manual defrost program is invoked.

[0165] Under the manual defrosting procedure, when the manual defrosting time reaches 600 seconds or the vehicle is not in the low-speed state, the defrosting preparation procedure is invoked.

[0166] In the defrosting preparation program state, when the air conditioner is turned off, the cooling fan stops, and the vehicle remains in the low speed state for 180 seconds, the parking defrosting program is invoked.

[0167] During the parking defrosting procedure, the procedure is stopped when the duration reaches 600 seconds.

[0168] Under the parking defrosting procedure, when the air conditioner is turned on, the cooling fan is running, or the vehicle is not in the low speed state, the defrosting preparation procedure is invoked.

[0169] The defrosting process is stopped when the outdoor ambient temperature is less than or equal to -22 degrees Celsius, or when the frost level is 0.

[0170] Determining and Implementing Defrosting Conditions: Based on information such as the current severity of frost, vehicle operating status, cooling fan operation, vehicle charging status, and user behavior, the defrosting process is implemented. The defrosting process is completed based on factors such as frost information and defrosting time. See below for specific methods. Figure 5 .

[0171] Conditions for each condition to be met:

[0172] Condition 1: If the ambient temperature is ≥ T3 (-20℃) and the frost information is ≥ Level 2, then Condition 1 is valid; otherwise, Condition 1 is invalid. The same applies below.

[0173] Condition 2: Ambient temperature ≤ T4 (-22℃) or frost information = level 0

[0174] Condition 3: The cooling fan is stopped and the charging gun is connected.

[0175] Condition 4: The cooling fan is running or the charging gun is disconnected.

[0176] Condition 5: The air conditioner is off and the cooling fan is stopped, and the low vehicle speed condition is met and continues for t2 (180s).

[0177] Condition 6: The judgment is not valid if the air conditioner is on, the cooling fan is running, or the vehicle speed is low.

[0178] Condition 7: A manual defrosting request exists and the low vehicle speed condition is met.

[0179] Condition 8: The maximum manual defrosting time t3 (600s, the timer starts when manual defrosting is initiated) is reached, or the low vehicle speed determination is not met.

[0180] Condition 9: The maximum defrosting time t4 (600s, the timer starts when defrosting begins) is reached.

[0181] Condition 10: Charging gun disconnected

[0182] Condition 11: Low speed determination is not valid.

[0183] Priority requirements:

[0184] When the defrosting process is in the defrosting preparation state, condition 2 > condition 3 > condition 5 > condition 7

[0185] When defrosting is performed under the charging defrosting condition, condition 9 > condition 2 > condition 4.

[0186] When the defrosting process is in manual mode, condition 2 > condition 8.

[0187] When defrosting is performed while the vehicle is stopped, condition 9 > condition 2 > condition 6.

[0188] In one embodiment of this application, when the vehicle speed is greater than or equal to 5 km / h and the duration is greater than or equal to 5 s, the vehicle is not in a low-speed state; when the speed is less than or equal to 1 km / h and the duration is greater than or equal to 5 s, the vehicle is in a low-speed state; when the speed is less than 5 km / h but greater than 1 km / h, the current state of the vehicle is the same as the previous vehicle speed state, and the initial vehicle speed state after the vehicle is powered on is the low-speed state.

[0189] When the vehicle speed is ≥ v1 (5 km / h) and the duration is ≥ t5 (5 s), the low vehicle speed determination is not valid; when the vehicle speed is ≤ v2 (1 km / h) and the duration is ≥ t6 (5 s), the low vehicle speed determination is valid; in other cases, the low vehicle speed determination remains the state of the previous moment, and the initial state after the vehicle is powered on is defined as valid.

[0190] In one embodiment of this application, during the charging defrosting program, the manual defrosting program, or the parking defrosting program, the system cycle is switched to the defrosting cycle. The compressor speed is controlled by the low pressure of the system refrigerant, and the high-temperature and high-pressure gas discharged from the compressor is throttled through the indoor condenser and then passes through the outdoor condenser to complete the defrosting process.

[0191] This application also provides a defrosting device for the outdoor condenser of an electric vehicle heat pump air conditioner, comprising:

[0192] The first temperature sensor is configured to acquire outdoor condenser outlet temperature information;

[0193] The second temperature sensor is configured to acquire outdoor ambient temperature information;

[0194] The frost level determination module is configured to determine the frost level based on the outdoor condenser outlet temperature information and the outdoor ambient temperature information.

[0195] The frost status information determination module is configured to determine frost status information based on the frost level, the outdoor condenser outlet temperature information, and a first preset condition.

[0196] The status information acquisition module is configured to acquire vehicle operating status information, cooling fan operating status information, vehicle charging status information, and user operation behavior information.

[0197] The defrosting module is configured to perform defrosting based on the frosting status information, the vehicle operating status information, the cooling fan operating status information, the vehicle charging status, and the user's operation behavior.

[0198] The defrosting control method for heat pump air conditioners provided in this application determines the severity of frost in real time based on factors such as the current ambient temperature and the outdoor condenser outlet temperature, and defines a graded classification. 2. This method dynamically adjusts the judgment criteria for different ambient temperatures and accurately determines the frost level based on the difference between the ambient temperature and the outdoor condenser outlet temperature. To further guide the subsequent defrosting process, this method uses a time delay to determine the frost level and combines it with the outdoor condenser outlet temperature for final confirmation of the frost information. Based on factors such as the severity of frost, vehicle operating status, cooling fan operation, vehicle charging status, and user operation behavior, this method provides three defrosting modes: parked defrosting, manual defrosting, and charging defrosting. These three modes can exist independently or in any combination. Specifically: Parking defrost refers to the automatic switching of the system to complete the defrosting process cyclically when the vehicle is stationary, based on frost information and vehicle speed determination. The defrosting process ends when the frost layer is detected as completely removed or the time limit is reached. Manual defrost refers to the defrosting process cyclically completed by the user through operation of the defrost button, also ending when the frost layer is detected as completely removed or the time limit is reached. Charging defrost refers to the automatic switching of the system to complete the defrosting process cyclically when the vehicle is charging, based on frost information and charging gun connection determination. The defrosting process ends when the frost layer is detected as completely removed or the time limit is reached. During the defrosting process... The cooling fan must be stationary to prevent water droplets formed during the frost melting process from hitting the fan blades and causing damage. The vehicle speed detection is to prevent the cooling fan from starting due to heat dissipation needs during driving, which could cause the damage mentioned above. When the ambient temperature is too low (below -22℃), the defrosting process is stopped because the refrigerant flow is low and the compressor oil circulation is poor at extremely low ambient temperatures, so the defrosting behavior is stopped to protect the compressor. During the defrosting process, a maximum defrosting time is defined, and the process automatically stops after the timeout to avoid the system being stuck in the defrosting cycle due to unexpected factors, which would affect normal use.

[0199] Exemplary electronic devices

[0200] Below, for reference Figure 7 This describes an electronic device according to embodiments of the present application.

[0201] Figure 7 A block diagram of an electronic device according to an embodiment of this application is illustrated.

[0202] like Figure 7 As shown, the electronic device 10 includes one or more processors 11 and memory 12.

[0203] The processor 11 may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 10 to perform desired functions.

[0204] The memory 12 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 11 may execute the program instructions to implement the functions in the defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner according to the various embodiments of this application described above, and / or other desired functions. Various contents, such as target location feature vectors, may also be stored in the computer-readable storage medium.

[0205] In one example, the electronic device 10 may also include an input device 13 and an output device 14, which are interconnected via a bus system and / or other forms of connection mechanism (not shown).

[0206] The input device 13 may include, for example, a keyboard, a mouse, etc.

[0207] The output device 14 can output various information to the outside, including decoded values. The output device 14 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0208] Of course, for the sake of simplicity, Figure 7 Only some of the components of the electronic device 10 relevant to this application are shown in this illustration; components such as buses, input / output interfaces, etc., are omitted. In addition, the electronic device 10 may include any other suitable components depending on the specific application.

[0209] Exemplary computer program products and computer-readable storage media

[0210] In addition to the methods and devices described above, embodiments of this application may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the steps of the defrosting method for an outdoor condenser of an electric vehicle heat pump air conditioner according to various embodiments of this application as described in the "Exemplary Methods" section above.

[0211] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of this application. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0212] Furthermore, embodiments of this application may also be computer-readable storage media storing computer program instructions that, when executed by a processor, cause the processor to perform the steps of the defrosting method for an outdoor condenser of an electric vehicle heat pump air conditioner according to various embodiments of this application as described in the "Exemplary Methods" section above.

[0213] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may, for example, include, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0214] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0215] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0216] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0217] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0218] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner, characterized in that, include: Obtain outdoor condenser outlet temperature information; Obtain outdoor ambient temperature information; The frosting level is determined based on the outdoor condenser outlet temperature information and the outdoor ambient temperature information. The frosting status information is determined based on the frosting level, the outdoor condenser outlet temperature information, and the first preset condition. Obtain vehicle operating status information; Obtain the operating status information of the cooling fan; Obtain vehicle charging status information; Obtain user action behavior information; The frost information is based on the frost status information, the vehicle operating status information, the cooling fan operating status information, the vehicle charging status, and the user operation behavior. The method further includes: When the outdoor ambient temperature is greater than or equal to -20 degrees Celsius and the frost level is greater than or equal to level 2, the defrosting preparation program is invoked. When the difference between the outdoor condenser outlet temperature and the outdoor ambient temperature is greater than XB(x) and less than or equal to XC(x), the frost level is level 2. XB and XC are parameters related to the ambient temperature, and x is determined based on the outdoor ambient temperature. In the defrost preparation program state, when the cooling fan stops and the charging gun is connected, the charging defrost program is invoked; When the defrosting process reaches 600 seconds, the charging defrosting procedure is stopped.

2. The defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner according to claim 1, characterized in that, The frosting information includes the following based on the frosting status information, the vehicle operating status information, the cooling fan operating status information, the vehicle charging status, and the user operation behavior information: The defrosting preparation program is invoked according to the second preset condition, which is: the current ambient temperature is -5℃ and the frost level is 2, which meets the requirements of condition 1; wherein, the requirements of condition 1 are: ambient temperature ≥ minus 20 degrees Celsius and frost level ≥ 2; The charging defrosting implementation program is invoked according to the third preset condition, which is: the charging gun is connected and the cooling fan is in a stopped state, satisfying condition 7; wherein, condition 7 requires: there is a manual defrosting request and the low vehicle speed determination is met. The defrosting process is terminated according to the fourth preset condition. The fourth preset condition is: the cooling fan is running or the charging gun is disconnected and condition 8 is met, or if the outdoor condenser outlet temperature is still below 7°C after 600 seconds during the charging defrosting process. Condition 8 requires that the maximum manual defrosting time is reached or the low vehicle speed determination is not met. The defrosting state procedure is invoked according to the fifth preset condition, which is: the condition required by condition 8 has not occurred, and the outdoor condenser outlet temperature rises to 7°C, or the charging gun is disconnected.

3. The defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner according to claim 2, characterized in that, The frosting level is determined based on the outdoor condenser outlet temperature information and the outdoor ambient temperature information, including: When the difference between the outdoor condenser outlet temperature and the outdoor ambient temperature is less than or equal to XA(x), the frosting level is 0. When the difference between the outdoor condenser outlet temperature and the outdoor ambient temperature is greater than XA(x) and less than or equal to XB(x), the frosting level is 1. When the difference between the outdoor condenser outlet temperature and the outdoor ambient temperature is greater than XC(x), the frosting level is 3. XA(x) = { XA1, x <= X1; (XA2 - XA1) / (X2 - X1) * (x - X1) + XA1, X1 < x <= X2; (XA3 - XA2) / (X3 - X2) * (x - X2) + XA2, X2 < x <= X3; XA3, x > X3 } XB(x) = { XB1, x <= X1; (XB2 - XB1) / (X2 - X1) * (x - X1) + XB1, X1 < x <= X2; (XB3 - XB2) / (X3 - X2) * (x - X2) + XB2, X2 < x <= X3; XB3, x > X3 } XC(x) = { XC1, x <= X1; (XC2 - XC1) / (X2 - X1) * (x - X1) + XC1, X1 < x <= X2; (XC3 - XC2) / (X3 - X2) * (x - X2) + XC2, X2 < x <= X3; XC3, x > X3 }； Wherein, X1, X2, and X3 are the outdoor ambient temperatures.

4. The defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner according to claim 3, characterized in that, The frosting status information is determined based on the frosting level, the outdoor condenser outlet temperature information, and the first preset condition, including: When the initial frosting level is 0 and the frosting pre-judgment timer exceeds 30 seconds, the current frosting state becomes frosted. When the initial frosting state is frosted and the outdoor condenser outlet temperature is greater than or equal to 7 degrees Celsius, the current frosting state changes to unfrosted or defrosting complete.

5. The defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner according to claim 4, characterized in that, The frosting information includes the following based on the frosting status information, the vehicle operating status information, the cooling fan operating status information, the vehicle charging status, and the user operation behavior information: During the charging defrosting procedure, the defrosting preparation procedure is invoked when the cooling fan is running or the charging gun is disconnected. In the defrost preparation program state, when a manual defrost request is received and the vehicle is at a low speed, the manual defrost program is invoked. Under the manual defrosting procedure, when the manual defrosting time reaches 600 seconds or the vehicle is not in the low-speed state, the defrosting preparation procedure is invoked. In the defrosting preparation program state, when the air conditioner is turned off, the cooling fan stops, and the vehicle remains in the low speed state for 180 seconds, the parking defrosting program is invoked. During the parking defrosting procedure, the procedure is stopped when the duration reaches 600 seconds. Under the parking defrosting procedure, when the air conditioner is turned on, the cooling fan is running, or the vehicle is not in the low speed state, the defrosting preparation procedure is invoked. The defrosting process is stopped when the outdoor ambient temperature is less than or equal to -22 degrees Celsius, or when the frost level is 0.

6. The defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner according to claim 5, characterized in that, When the vehicle speed is greater than or equal to 5 km / h and the duration is greater than or equal to 5 seconds, the vehicle is not in a low-speed state; when the vehicle speed is less than or equal to 1 km / h and the duration is greater than or equal to 5 seconds, the vehicle is in a low-speed state; when the vehicle speed is less than 5 km / h but greater than 1 km / h, the current state of the vehicle is the same as the previous vehicle speed state, and the initial vehicle speed state after the vehicle is powered on is the low-speed state.

7. The defrosting method for the outdoor condenser of an electric vehicle heat pump air conditioner according to claim 6, characterized in that, During the charging defrosting program, the manual defrosting program, or the shutdown defrosting program, the system cycle is switched to the defrosting cycle. The compressor speed is controlled by the low pressure of the system refrigerant. The high-temperature and high-pressure gas discharged from the compressor passes through the indoor condenser, is throttled, and then passes through the outdoor condenser to complete the defrosting process.

8. A defrosting device for the outdoor condenser of an electric vehicle heat pump air conditioner, characterized in that, include: The first temperature sensor is configured to acquire outdoor condenser outlet temperature information; The second temperature sensor is configured to acquire outdoor ambient temperature information; The frost level determination module is configured to determine the frost level based on the outdoor condenser outlet temperature information and the outdoor ambient temperature information. The frost status information determination module is configured to determine frost status information based on the frost level, the outdoor condenser outlet temperature information, and a first preset condition. The status information acquisition module is configured to acquire vehicle operating status information, cooling fan operating status information, vehicle charging status information, and user operation behavior information. The defrosting module is configured to perform defrosting based on the frosting status information, the vehicle operating status information, the cooling fan operating status information, the vehicle charging status, and the user's operation behavior. The defrosting module is further configured as follows: When the outdoor ambient temperature is greater than or equal to -20 degrees Celsius and the frost level is greater than or equal to level 2, the defrosting preparation program is invoked. When the difference between the outdoor condenser outlet temperature and the outdoor ambient temperature is greater than XB(x) and less than or equal to XC(x), the frost level is level 2. XB and XC are parameters related to the ambient temperature, and x is determined based on the outdoor ambient temperature. In the defrost preparation program state, when the cooling fan stops and the charging gun is connected, the charging defrost program is invoked; When the defrosting process reaches 600 seconds, the charging defrosting procedure is stopped.

9. A vehicle monitoring electronic device, comprising an external memory card, characterized in that, The electronic device includes the apparatus as described in claim 8.

10. A storage medium, characterized in that, It contains a computer program that, when executed by a processor, implements the method as described in any one of claims 1-7.

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