Rotational speed control method and device for electric compressor, and vehicle

Abstract

A rotational speed control method and device (510) for an electric compressor, and a vehicle. The rotational speed control method comprises: acquiring cooling demand of a vehicle; when the cooling demand comprises both battery cooling demand and passenger compartment cooling demand, determining whether a target parameter meets a corresponding preset condition; if the target parameter meets the corresponding preset condition, on the basis of the current battery cooling demand power, an actual battery coolant inlet temperature, and a target battery coolant temperature, determining the cooling operation speed of the electric compressor corresponding to battery cooling; and if the target parameter does not meet the corresponding preset condition, on the basis of the current passenger compartment cooling demand power, an actual evaporator temperature, and a target evaporator temperature, determining the cooling operation speed of the electric compressor corresponding to passenger compartment cooling. The technical solution provided by the present disclosure fully considers passenger compartment comfort while taking into account battery safety requirements, thereby effectively improving energy utilization efficiency and enhancing passenger compartment comfort.

Description

A method, device, and vehicle for controlling the speed of an electric compressor.

[0001] Cross-references to related applications

[0002] This disclosure claims priority to Chinese Patent Application No. 2024119385508, filed on December 26, 2024, entitled "A method, apparatus and vehicle for controlling the speed of an electric compressor", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of vehicle refrigeration technology, and in particular to a method, device and vehicle for controlling the speed of an electric compressor. Background Technology

[0004] Electric vehicles are gradually becoming the mainstream development trend in the automotive industry. The electric compressor plays a central role in the air conditioning system of electric vehicles. Compressor speed regulation, noise control, energy consumption optimization, cooling capacity distribution between cabin cooling and battery cooling, and refrigerant circuit system protection are all key aspects of compressor control.

[0005] However, during compressor operation, issues such as speed fluctuations, frequent start-stop cycles, excessive noise, and uneven distribution of cooling capacity may occur. Under high load conditions, refrigerant system overpressure may also arise. These problems can all affect cabin comfort and battery cooling performance to some extent. Summary of the Invention

[0006] In view of this, the present disclosure provides a method, device and vehicle for controlling the speed of an electric compressor. The present disclosure fully considers the comfort of the passenger cabin while taking into account the safety requirements of the battery, effectively improving energy efficiency and enhancing the comfort of the passenger cabin.

[0007] This disclosure mainly includes the following aspects:

[0008] In a first aspect, an optional embodiment of this disclosure provides a method for controlling the speed of an electric compressor, the control method comprising:

[0009] Obtain the vehicle's cooling requirements;

[0010] If the cooling demand includes both battery cooling demand and cabin cooling demand, determine whether the target parameters meet the corresponding preset conditions; the target parameters include battery cell temperature and / or battery cooling level.

[0011] If the target parameters meet the corresponding preset conditions, the electric compressor cooling speed corresponding to the battery cooling is determined based on the current battery cooling power demand, the actual battery inlet temperature and the battery target coolant temperature.

[0012] If the target parameters do not meet the corresponding preset conditions, the operating speed of the electric compressor corresponding to cabin cooling will be determined based on the current cabin cooling power demand, the actual evaporator temperature, and the target evaporator temperature.

[0013] Preferably, the target parameters satisfy the corresponding preset conditions including at least one of the following: the battery cell temperature is greater than the preset temperature, and the battery cooling level is greater than the preset cooling level.

[0014] Preferably, determining the operating speed of the electric compressor corresponding to battery cooling based on the current battery cooling power demand, the actual battery inlet temperature, and the target battery coolant temperature includes:

[0015] Based on the mapping relationship between the battery cooling power demand and the initial speed of the electric compressor, the initial speed of the electric compressor corresponding to the current battery cooling power demand is determined.

[0016] Based on the difference between the actual inlet temperature of the battery and the target coolant temperature of the battery, the deviation between the initial speed of the electric compressor and the cooling operation speed of the electric compressor corresponding to battery cooling is determined.

[0017] The sum of the initial speed and the deviation is determined as the operating speed of the electric compressor corresponding to battery cooling.

[0018] Preferably, determining the operating speed of the electric compressor corresponding to cabin cooling based on the current cabin cooling power demand, the actual evaporator temperature, and the target evaporator temperature includes:

[0019] Based on the mapping relationship between cabin cooling power demand and electric compressor initial speed, determine the electric compressor initial speed corresponding to the current cabin cooling power demand.

[0020] Based on the difference between the actual evaporator temperature and the target evaporator temperature, the deviation between the initial speed of the electric compressor and the operating speed of the electric compressor corresponding to cabin refrigeration is determined.

[0021] The sum of the initial speed of the electric compressor and the deviation is determined as the operating speed of the electric compressor for cabin refrigeration.

[0022] Preferably, the speed control method further includes:

[0023] The current preset protection parameters are compared with the first preset protection threshold to determine whether to reduce the cooling operating speed of the electric compressor; the cooling operating speed of the electric compressor includes: the cooling operating speed of the electric compressor corresponding to battery cooling and / or the cooling operating speed of the electric compressor corresponding to cabin cooling;

[0024] If the cooling operating speed of the electric compressor is not reduced, then the cooling operating speed of the electric compressor shall be determined as the target speed of the electric compressor.

[0025] If the cooling operating speed of the electric compressor is reduced, the speed reduction factor of the electric compressor is determined based on the first preset protection threshold and the second preset protection threshold.

[0026] Based on the aforementioned speed reduction factor, the reduced operating speed of the electric compressor for refrigeration is determined;

[0027] The current preset protection parameter is compared with the second preset protection threshold to determine whether to cut off the reduced electric compressor refrigeration operating speed.

[0028] If the reduced electric compressor refrigeration operating speed is not cut off, then the reduced electric compressor refrigeration operating speed will be determined as the target speed of the electric compressor.

[0029] If the reduced operating speed of the electric compressor for refrigeration is cut off, then the reduced operating speed of the electric compressor for refrigeration is determined as the target speed of the electric compressor.

[0030] Secondly, an optional embodiment of this disclosure also provides a speed control device for an electric compressor, the speed control device comprising:

[0031] The module acquires the vehicle's cooling requirements.

[0032] The cooling demand determination module determines whether the target parameters meet the corresponding preset conditions when the cooling demand includes both battery cooling demand and cabin cooling demand; the target parameters include battery cell temperature and / or battery cooling level.

[0033] The battery cooling speed determination module determines the electric compressor cooling operating speed corresponding to battery cooling based on the current battery cooling power demand, the actual battery inlet temperature, and the target battery coolant temperature, if the target parameters meet the corresponding preset conditions.

[0034] If the target parameters do not meet the corresponding preset conditions, the cabin cooling speed determination module determines the corresponding electric compressor cooling operating speed based on the current cabin cooling power demand, the actual evaporator temperature, and the target evaporator temperature.

[0035] Preferably, the target parameters satisfy the corresponding preset conditions including at least one of the following: the battery cell temperature is greater than the preset temperature, and the battery cooling level is greater than the preset cooling level.

[0036] Preferably, when the battery cooling speed determination module is used to determine the operating speed of the electric compressor corresponding to battery cooling based on the current battery cooling power demand, the actual battery inlet temperature, and the target battery coolant temperature, it is further specifically used for:

[0037] Based on the mapping relationship between the battery cooling power demand and the initial speed of the electric compressor, the initial speed of the electric compressor corresponding to the current battery cooling power demand is determined.

[0038] Based on the difference between the actual inlet temperature of the battery and the target coolant temperature of the battery, the deviation between the initial speed of the electric compressor and the cooling operation speed of the electric compressor corresponding to battery cooling is determined.

[0039] The sum of the initial speed and the deviation is determined as the operating speed of the electric compressor corresponding to battery cooling.

[0040] Preferably, when the cabin cooling speed determination module is used to determine the operating speed of the electric compressor corresponding to cabin cooling based on the current cabin cooling power demand, the actual evaporator temperature, and the target evaporator temperature, it is further specifically used for:

[0041] Based on the mapping relationship between cabin cooling power demand and electric compressor initial speed, determine the electric compressor initial speed corresponding to the current cabin cooling power demand.

[0042] Based on the difference between the actual evaporator temperature and the target evaporator temperature, the deviation between the initial speed of the electric compressor and the operating speed of the electric compressor corresponding to cabin refrigeration is determined.

[0043] The sum of the initial speed of the electric compressor and the deviation is determined as the operating speed of the electric compressor for cabin refrigeration.

[0044] Thirdly, in an optional embodiment of this disclosure, a vehicle is also provided, the vehicle including the speed control device for the electric compressor described above.

[0045] This disclosure provides a method, apparatus, and vehicle for controlling the speed of an electric compressor. First, the vehicle's cooling demand is obtained. When the cooling demand includes both battery cooling demand and cabin cooling demand, it is determined whether target parameters, including battery cell temperature and / or battery cooling level, meet preset conditions. If they do, the operating speed of the electric compressor corresponding to battery cooling is determined based on the current battery cooling demand power, the actual battery inlet temperature, and the target battery coolant temperature. If the conditions are not met, the operating speed of the electric compressor corresponding to cabin cooling is determined based on the current cabin cooling demand power, the actual evaporator temperature, and the target evaporator temperature. This approach fully considers cabin comfort while also taking into account battery safety requirements, effectively improving energy efficiency and enhancing cabin comfort.

[0046] To make the above-mentioned objects, features and advantages of this disclosure more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

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

[0048] Figure 1 shows one of the flowcharts of an optional embodiment of the present disclosure of a speed control method for an electric compressor;

[0049] Figure 2 shows a second flowchart of an optional embodiment of an electric compressor speed control method provided in this disclosure;

[0050] Figure 3 shows a third flowchart of an optional embodiment of an electric compressor speed control method provided in this disclosure;

[0051] Figure 4 shows a flowchart of an optional embodiment of an electric compressor speed control method provided in this disclosure;

[0052] Figure 5 shows one of the structural schematic diagrams of a speed control device for an electric compressor provided in an optional embodiment of this disclosure;

[0053] Figure 6 shows a second schematic diagram of the structure of a rotation speed device for an electric compressor provided in an optional embodiment of this disclosure. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the drawings in this disclosure are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this disclosure. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this disclosure illustrate operations implemented according to some embodiments of this disclosure. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or performed simultaneously. In addition, those skilled in the art, guided by the content of this disclosure, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0055] Furthermore, the described embodiments are merely some, not all, of the embodiments of this disclosure. The components of the embodiments of this disclosure typically described and illustrated in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this disclosure provided in the drawings is not intended to limit the scope of the claimed disclosure, but merely to illustrate selected embodiments of the disclosure. All other embodiments that can be obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0056] The methods, apparatus, electronic devices, or computer-readable storage media described in this disclosure can be applied to any scenario requiring vehicle refrigeration. This disclosure does not limit specific application scenarios, and any scheme using the electric compressor speed control method and apparatus provided in this disclosure is within the scope of protection of this disclosure.

[0057] Electric vehicles are gradually becoming the mainstream development trend in the automotive industry. The electric compressor plays a central role in the air conditioning system of electric vehicles. Compressor speed regulation, noise control, energy consumption optimization, cooling capacity distribution between cabin cooling and battery cooling, and refrigerant circuit system protection are all key aspects of compressor control. However, during compressor operation, issues such as speed fluctuations, frequent start-stop cycles, excessive noise, and uneven cooling capacity distribution can occur. Under high load conditions, refrigerant system overpressure problems can also easily arise. These issues can all affect cabin comfort and battery cooling performance to some extent.

[0058] To address the aforementioned issues, this disclosure provides a method, apparatus, and vehicle for controlling the speed of an electric compressor, which fully considers cabin comfort while also taking into account battery safety requirements, effectively improving energy efficiency and enhancing cabin comfort.

[0059] To facilitate understanding of this disclosure, the technical solutions provided in this disclosure will be described in detail below with reference to specific embodiments.

[0060] Please refer to Figure 1, which is one of the flowcharts of an optional embodiment of the present disclosure of a speed control method for an electric compressor.

[0061] As shown in Figure 1, an optional embodiment of this disclosure provides a method for controlling the speed of an electric compressor, which includes the following steps:

[0062] Step S101: Obtain the vehicle's cooling requirements.

[0063] In this embodiment of the disclosure, the vehicle's cooling requirements include: battery cooling requirements and / or cabin cooling requirements.

[0064] Step S102: If the cooling demand includes both battery cooling demand and cabin cooling demand, determine whether the target parameters meet the corresponding preset conditions; the target parameters include battery cell temperature and / or battery cooling level. For example, the target parameters meeting the corresponding preset conditions include at least one of the following: battery cell temperature is greater than a preset temperature, and battery cooling level is greater than a preset cooling level.

[0065] Here, if the cooling demand includes both battery cooling and cabin cooling demand, a cooling conflict occurs, so it is necessary to determine the priority of battery cooling and cabin cooling demand. A battery cell temperature exceeding a preset temperature means that the highest temperature among the various battery cells exceeds a first preset temperature. The preset cooling level is the level corresponding to a set number of battery cells in the battery pack not exceeding a second preset temperature. When a set number of battery cells in the battery pack exceed the second preset temperature, and a risk is identified, the battery pack sends a battery cooling level information higher than the preset cooling level to the controller.

[0066] Step S103: If the target parameters meet the corresponding preset conditions, then the electric compressor cooling operating speed corresponding to the battery cooling is determined based on the current battery cooling power demand, the actual battery inlet temperature, and the battery target coolant temperature.

[0067] The following section, with reference to Figure 2, explains how to determine the operating speed of the electric compressor corresponding to battery cooling based on the current battery cooling power demand, the actual battery inlet temperature, and the target battery coolant temperature.

[0068] Please refer to Figure 2, which is a flowchart of a speed control method for an electric compressor provided in an optional embodiment of this disclosure.

[0069] As shown in Figure 2, regarding the determination of the electric compressor's operating speed for battery cooling based on the current battery cooling power demand, the actual battery inlet temperature, and the target battery coolant temperature, the specific implementation, as an example, includes the following steps:

[0070] Step S1031: Based on the mapping relationship between the battery cooling power demand and the initial speed of the electric compressor, determine the initial speed of the electric compressor corresponding to the current battery cooling power demand.

[0071] Here, the battery cooling power demand is based on the actual battery inlet temperature and the target coolant temperature. The mapping relationship is obtained through experiments, theoretical calculations, or statistical analysis of actual operating data. As an example, when the battery cooling power demand is 17kW, the corresponding initial speed of the electric compressor is 1200 rpm.

[0072] Step S1032: Based on the difference between the actual water inlet temperature of the battery and the target coolant temperature of the battery, determine the deviation between the initial speed of the electric compressor and the cooling operation speed of the electric compressor corresponding to battery cooling.

[0073] Here, the difference between the actual inlet temperature of the battery and the target coolant temperature of the battery is used as the deviation of the PID. As an example, the deviation between the initial speed of the electric compressor corresponding to the current battery cooling demand power and the cooling operation speed of the electric compressor corresponding to battery cooling can be determined by formula (1).

[0074] Where Δn1 is the deviation between the initial speed of the electric compressor corresponding to the current battery cooling power demand and the cooling operation speed of the electric compressor corresponding to battery cooling, K p K is the proportionality coefficient. i K is the integral coefficient. d Here, e1(t) is the differential coefficient, and e1(t) is the difference between the actual inlet temperature of the battery and the target coolant temperature of the battery at time t.

[0075] Step S1033: The sum of the initial rotation speed and the deviation is determined as the operating speed of the electric compressor corresponding to battery cooling.

[0076] Here, the initial speed of the electric compressor corresponding to the current battery cooling demand is used as the feedforward of the PID controller. As an example, the operating speed of the electric compressor corresponding to battery cooling can be determined by formula (2). i1 =n 01 +Δn1 (2)

[0077] Where, n i1 n is the operating speed of the electric compressor corresponding to battery cooling. 01 This is the initial speed of the electric compressor corresponding to the current battery cooling power requirement.

[0078] Step S104: If the target parameters do not meet the corresponding preset conditions, then the operating speed of the electric compressor corresponding to the cabin cooling is determined based on the current cabin cooling power demand, the actual evaporator temperature and the target evaporator temperature.

[0079] The following section, with reference to Figure 3, explains how to determine the operating speed of the electric compressor for cabin cooling based on the current cabin cooling power demand, the actual evaporator temperature, and the target evaporator temperature.

[0080] Please refer to Figure 3, which is a flowchart of an optional embodiment of the present disclosure of a method for controlling the speed of an electric compressor.

[0081] As shown in Figure 3, the method for determining the operating speed of the electric compressor for cabin cooling based on the current cabin cooling power demand, actual evaporator temperature, and target evaporator temperature, as an example, includes the following steps in a practical implementation:

[0082] Step S1041: Based on the mapping relationship between the cabin cooling power demand and the initial speed of the electric compressor, determine the initial speed of the electric compressor corresponding to the current cabin cooling power demand.

[0083] Step S1042: Based on the difference between the actual evaporator temperature and the target evaporator temperature, determine the deviation between the initial speed of the electric compressor and the operating speed of the electric compressor corresponding to cabin refrigeration.

[0084] Here, the difference between the actual evaporator temperature and the target evaporator temperature is used as the deviation of the PID. As an example, the deviation between the initial speed of the electric compressor corresponding to the current cabin cooling demand power and the cooling operation speed of the electric compressor corresponding to cabin cooling can be determined by formula (3).

[0085] Where Δn2 is the deviation between the initial speed of the electric compressor corresponding to the current cabin cooling demand power and the cooling operation speed of the electric compressor corresponding to cabin cooling, and e2(t) is the difference between the actual evaporator temperature and the target evaporator temperature at time t.

[0086] Step S1043: The sum of the initial speed of the electric compressor and the deviation is determined as the cooling operating speed of the electric compressor corresponding to cabin cooling.

[0087] Here, the initial speed of the electric compressor corresponding to the current cabin cooling demand is used as the feedforward of the PID controller. As an example, the operating speed of the electric compressor corresponding to cabin cooling can be determined by formula (4). i2 =n 02 +Δn2 (4)

[0088] Where, n i2 The operating speed of the electric compressor corresponding to cabin cooling, n 02 The initial speed of the electric compressor is the power required for the current cabin cooling.

[0089] Please refer to Figure 4, which is a flowchart of an optional embodiment of the present disclosure of a method for controlling the speed of an electric compressor.

[0090] As shown in Figure 4, the speed control method further includes:

[0091] Step S105: Compare the current preset protection parameters with the first preset protection threshold to determine whether to reduce the cooling operating speed of the electric compressor; the cooling operating speed of the electric compressor includes: the cooling operating speed of the electric compressor corresponding to battery cooling and / or the cooling operating speed of the electric compressor corresponding to cabin cooling.

[0092] Here, the preset protection parameters in this embodiment are parameters in the refrigerant circuit. These preset protection parameters include high pressure and low pressure. Real-time monitoring of these preset protection parameters ensures the safe and stable operation of the refrigerant circuit. When the preset protection parameters exceed the normal range, measures such as reducing the compressor speed or cutting off the compressor speed are taken to prevent system malfunctions or damage. The refrigerant circuit includes: a compressor, an electronic expansion valve, a shut-off valve, an evaporator, a condenser, a battery cooler, a battery, a pressure sensor, and a temperature sensor.

[0093] Specifically, in this embodiment of the disclosure, two preset protection thresholds are set: a first preset protection threshold Hp1 and a second preset protection threshold Hp2, and the current preset protection parameter is compared with the first preset protection threshold Hp1.

[0094] Step S106: If the cooling operating speed of the electric compressor is not reduced, then the cooling operating speed of the electric compressor is determined as the target speed of the electric compressor.

[0095] Step S107: If the cooling operation speed of the electric compressor is reduced, the speed reduction factor of the electric compressor is determined based on the first preset protection threshold and the second preset protection threshold.

[0096] Here, as an example, the speed reduction factor of the electric compressor can be determined by formula (5).

[0097] Where P is the preset protection parameter and Factor is the speed reduction factor of the electric compressor.

[0098] Step S108: Based on the speed reduction factor, determine the reduced operating speed of the electric compressor for refrigeration.

[0099] Here, as an example, the reduced operating speed of the electric compressor for refrigeration can be determined using formula (6). n=n0×(1-Factor) (6)

[0100] Where n is the reduced operating speed of the electric compressor for refrigeration, and n0 is the operating speed of the electric compressor for refrigeration.

[0101] Step S109: Compare the current preset protection parameter with the second preset protection threshold to determine whether to cut off the reduced electric compressor refrigeration operating speed.

[0102] Specifically, the current preset protection parameters are compared with the second preset protection threshold Hp2.

[0103] In step S110, if the reduced electric compressor refrigeration operating speed is not cut off, the reduced electric compressor refrigeration operating speed is determined as the target speed of the electric compressor.

[0104] Step S111: If the reduced electric compressor cooling operating speed is cut off, then the reduced electric compressor cooling operating speed is determined as the target speed of the electric compressor.

[0105] The steps S105-S111 will be explained below with specific examples.

[0106] As an example, suppose the preset protection parameter is high pressure. Pressure and temperature sensors are installed at the compressor inlet and outlet. The preset high pressure parameter is to prevent overpressure in the refrigerant circuit. When the high pressure exceeds the first preset protection threshold Hp1, it indicates that the pressure in the refrigerant circuit is too high, possibly due to abnormal refrigerant flow, poor heat dissipation, or other reasons. At this point, the compressor speed is reduced to decrease the amount of refrigerant compressed, thereby reducing the system pressure. If the pressure continues to increase and exceeds the higher second preset protection threshold Hp2, it means that the circuit pressure has exceeded the safe range. Continued operation may cause serious damage to the system. Therefore, it is necessary to cut off the compressor speed to stop the system and avoid danger.

[0107] In this embodiment, when cooling the cabin, the preset protection parameters related to cabin cooling are compared with the corresponding preset protection thresholds. When cooling the battery, the preset protection parameters related to battery cooling are compared with the corresponding preset protection thresholds. When cooling both the battery and the cabin simultaneously, the preset protection parameters related to battery cooling and the preset protection parameters related to cabin cooling are compared with the corresponding preset protection thresholds. In this way, when cooling a single cabin / single battery, protection is provided based on fewer conditions, which simplifies the protection logic, reduces the complexity of calculation and judgment, and improves the timeliness and accuracy of protection response, thereby more efficiently ensuring the safe and stable operation of the refrigerant circuit.

[0108] This disclosure provides a method for controlling the speed of an electric compressor. This method fully considers cabin comfort while also taking into account battery safety requirements, effectively improving energy efficiency and enhancing cabin comfort.

[0109] Based on the same concept, this disclosure also provides a speed control device for an electric compressor corresponding to the speed control method for an electric compressor provided in the above embodiments. Since the principle of the device in this disclosure for solving the problem is similar to the speed control method for an electric compressor in the above embodiments of this disclosure, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.

[0110] As shown in Figures 5 and 6, Figure 5 is a schematic diagram of the structure of a speed device for an electric compressor provided in an optional embodiment of the present disclosure, and Figure 6 is a schematic diagram of the structure of a speed device for an electric compressor provided in an optional embodiment of the present disclosure.

[0111] As shown in Figure 5, an optional embodiment of this disclosure also provides a speed control device for an electric compressor, the speed control device 510 comprising:

[0112] Module 511 is used to obtain the vehicle's cooling requirements;

[0113] The cooling demand determination module 512 determines whether the target parameters meet the corresponding preset conditions when the cooling demand includes both battery cooling demand and cabin cooling demand; the target parameters include battery cell temperature and / or battery cooling level.

[0114] The battery cooling speed determination module 513 determines the electric compressor cooling operation speed corresponding to battery cooling based on the current battery cooling power demand, the actual battery inlet temperature, and the battery target coolant temperature if the target parameters meet the corresponding preset conditions.

[0115] The cabin cooling speed determination module 514 determines the operating speed of the electric compressor corresponding to cabin cooling based on the current cabin cooling power demand, actual evaporator temperature, and target evaporator temperature if the target parameters do not meet the corresponding preset conditions.

[0116] Preferably, the target parameters satisfy the corresponding preset conditions including at least one of the following: the battery cell temperature is greater than the preset temperature, and the battery cooling level is greater than the preset cooling level.

[0117] Preferably, when the battery cooling speed determination module 513 is used to determine the electric compressor cooling operating speed corresponding to battery cooling based on the current battery cooling power demand, the actual battery inlet temperature, and the target battery coolant temperature, it is further specifically used for:

[0118] Based on the mapping relationship between the battery cooling power demand and the initial speed of the electric compressor, the initial speed of the electric compressor corresponding to the current battery cooling power demand is determined.

[0119] Based on the difference between the actual inlet temperature of the battery and the target coolant temperature of the battery, the deviation between the initial speed of the electric compressor and the cooling operation speed of the electric compressor corresponding to battery cooling is determined.

[0120] The sum of the initial speed and the deviation is determined as the operating speed of the electric compressor corresponding to battery cooling.

[0121] Preferably, when the battery cooling speed determination module 514 is used to determine the operating speed of the electric compressor corresponding to cabin cooling based on the current cabin cooling power demand, the actual evaporator temperature, and the target evaporator temperature, it is further specifically used for:

[0122] Based on the mapping relationship between cabin cooling power demand and electric compressor initial speed, determine the electric compressor initial speed corresponding to the current cabin cooling power demand.

[0123] Based on the difference between the actual evaporator temperature and the target evaporator temperature, the deviation between the initial speed of the electric compressor and the operating speed of the electric compressor corresponding to cabin refrigeration is determined.

[0124] The sum of the initial speed of the electric compressor and the deviation is determined as the operating speed of the electric compressor for cabin refrigeration.

[0125] As shown in Figure 6, preferably, the speed control device 510 further includes:

[0126] The speed comparison module 515 compares the current preset protection parameter with the first preset protection threshold to determine whether to reduce the cooling operating speed of the electric compressor; the cooling operating speed of the electric compressor includes: the cooling operating speed of the electric compressor corresponding to battery cooling and / or the cooling operating speed of the electric compressor corresponding to cabin cooling;

[0127] The target speed determination module 516 determines the electric compressor's cooling operating speed as the target speed if the electric compressor's cooling operating speed is not reduced.

[0128] The speed reduction factor determination module 517 determines the speed reduction factor of the electric compressor based on the first preset protection threshold and the second preset protection threshold if the cooling operation speed of the electric compressor is reduced.

[0129] The speed reduction determination module 518 determines the reduced operating speed of the electric compressor for refrigeration based on the speed reduction factor.

[0130] The speed cut-off determination module 519 compares the current preset protection parameter with the second preset protection threshold to determine whether to cut off the reduced electric compressor refrigeration operation speed.

[0131] The target speed selection module 520, if the reduced electric compressor refrigeration operating speed is not cut off, will determine the reduced electric compressor refrigeration operating speed as the target speed of the electric compressor.

[0132] If the reduced electric compressor refrigeration operating speed is cut off by the target speed selection module 521, then the reduced electric compressor refrigeration operating speed will be determined as the target speed of the electric compressor.

[0133] This disclosure provides a speed control device for an electric compressor. By fully considering cabin comfort while taking into account battery safety requirements, the device effectively improves energy efficiency and enhances cabin comfort.

[0134] This disclosure also provides a vehicle that includes the speed control device for the electric compressor described above.

[0135] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and devices described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. In the several embodiments provided in this disclosure, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division; in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection may be through some communication interfaces; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0136] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0137] In addition, the functional units in the various embodiments of this disclosure can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0138] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to related technologies, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this disclosure. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0139] Finally, it should be noted that the above-described embodiments are merely specific implementations of this disclosure, used to illustrate the technical solutions of this disclosure, and not to limit it. The protection scope of this disclosure is not limited thereto. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this disclosure; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure, and should all be covered within the protection scope of this disclosure. Therefore, the protection scope of this disclosure should be determined by the protection scope of the claims.

Claims

1. A method for controlling the speed of an electric compressor, the method comprising: Obtain the vehicle's cooling requirements; If the cooling demand includes both battery cooling demand and cabin cooling demand, determine whether the target parameters meet the corresponding preset conditions. The target parameters include battery cell temperature and / or battery cooling level; If the target parameters meet the corresponding preset conditions, the electric compressor cooling speed corresponding to the battery cooling is determined based on the current battery cooling power demand, the actual battery inlet temperature and the battery target coolant temperature. If the target parameters do not meet the corresponding preset conditions, the operating speed of the electric compressor corresponding to cabin cooling will be determined based on the current cabin cooling power demand, the actual evaporator temperature, and the target evaporator temperature.

2. The speed control method according to claim 1, wherein, The target parameters must meet the corresponding preset conditions, including at least one of the following: the battery cell temperature is greater than the preset temperature, and the battery cooling level is greater than the preset cooling level.

3. The speed control method according to claim 2, wherein, The determination of the electric compressor's operating speed for battery cooling, based on the current battery cooling power demand, the actual battery inlet temperature, and the target coolant temperature, includes: Based on the mapping relationship between the battery cooling power demand and the initial speed of the electric compressor, the initial speed of the electric compressor corresponding to the current battery cooling power demand is determined. Based on the difference between the actual inlet temperature of the battery and the target coolant temperature of the battery, the deviation between the initial speed of the electric compressor and the cooling operation speed of the electric compressor corresponding to battery cooling is determined. The sum of the initial speed and the deviation is determined as the operating speed of the electric compressor corresponding to battery cooling.

4. The speed control method according to claim 2, wherein, The process of determining the operating speed of the electric compressor corresponding to cabin cooling based on the current cabin cooling power demand, actual evaporator temperature, and target evaporator temperature includes: Based on the mapping relationship between cabin cooling power demand and electric compressor initial speed, determine the electric compressor initial speed corresponding to the current cabin cooling power demand. Based on the difference between the actual evaporator temperature and the target evaporator temperature, the deviation between the initial speed of the electric compressor and the operating speed of the electric compressor corresponding to cabin refrigeration is determined. The sum of the initial speed of the electric compressor and the deviation is determined as the operating speed of the electric compressor for cabin refrigeration.

5. The speed control method according to claim 1, wherein, The speed control method further includes: The current preset protection parameters are compared with the first preset protection threshold to determine whether to reduce the cooling operating speed of the electric compressor; the cooling operating speed of the electric compressor includes: the cooling operating speed of the electric compressor corresponding to battery cooling and / or the cooling operating speed of the electric compressor corresponding to cabin cooling; If the cooling operating speed of the electric compressor is not reduced, then the cooling operating speed of the electric compressor shall be determined as the target speed of the electric compressor. If the cooling operating speed of the electric compressor is reduced, the speed reduction factor of the electric compressor is determined based on the first preset protection threshold and the second preset protection threshold. Based on the aforementioned speed reduction factor, the reduced operating speed of the electric compressor for refrigeration is determined; The current preset protection parameter is compared with the second preset protection threshold to determine whether to cut off the reduced electric compressor refrigeration operating speed. If the reduced electric compressor refrigeration operating speed is not cut off, then the reduced electric compressor refrigeration operating speed will be determined as the target speed of the electric compressor. If the reduced operating speed of the electric compressor for refrigeration is cut off, then the reduced operating speed of the electric compressor for refrigeration is determined as the target speed of the electric compressor.

6. A speed control device for an electric compressor, the speed control device comprising: The module obtains the vehicle's cooling requirements; The cooling demand determination module determines whether the target parameters meet the corresponding preset conditions when the cooling demand includes both battery cooling demand and cabin cooling demand; the target parameters include battery cell temperature and / or battery cooling level. The battery cooling speed determination module determines the electric compressor cooling operating speed corresponding to battery cooling based on the current battery cooling power demand, the actual battery inlet temperature, and the target battery coolant temperature, if the target parameters meet the corresponding preset conditions. If the target parameters do not meet the corresponding preset conditions, the cabin cooling speed determination module determines the corresponding electric compressor cooling operating speed based on the current cabin cooling power demand, the actual evaporator temperature, and the target evaporator temperature.

7. The speed control device according to claim 6, wherein, The target parameters must meet the corresponding preset conditions, including at least one of the following: the battery cell temperature is greater than the preset temperature, and the battery cooling level is greater than the preset cooling level.

8. The speed control device according to claim 7, wherein, The battery cooling speed determination module, when used to determine the operating speed of the electric compressor corresponding to battery cooling based on the current battery cooling power demand, the actual battery inlet temperature, and the target battery coolant temperature, is also specifically used for: Based on the mapping relationship between the battery cooling power demand and the initial speed of the electric compressor, the initial speed of the electric compressor corresponding to the current battery cooling power demand is determined. Based on the difference between the actual inlet temperature of the battery and the target coolant temperature of the battery, the deviation between the initial speed of the electric compressor and the cooling operation speed of the electric compressor corresponding to battery cooling is determined. The sum of the initial speed and the deviation is determined as the operating speed of the electric compressor corresponding to battery cooling.

9. The speed control device according to claim 7, wherein, The cabin cooling speed determination module, when used to determine the operating speed of the electric compressor corresponding to cabin cooling based on the current cabin cooling power demand, the actual evaporator temperature, and the target evaporator temperature, is also specifically used for: Based on the mapping relationship between cabin cooling power demand and electric compressor initial speed, determine the electric compressor initial speed corresponding to the current cabin cooling power demand. Based on the difference between the actual evaporator temperature and the target evaporator temperature, the deviation between the initial speed of the electric compressor and the operating speed of the electric compressor corresponding to cabin refrigeration is determined. The sum of the initial speed of the electric compressor and the deviation is determined as the operating speed of the electric compressor for cabin refrigeration.

10. A vehicle comprising a speed control device for an electric compressor according to any one of claims 6 to 9.

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