Rotating speed control method and device of electric compressor and vehicle

Abstract

The invention provides a rotating speed control method and device of an electric compressor and a vehicle. The rotating speed control method comprises the steps that the refrigeration requirement of the vehicle is obtained; if the refrigeration requirements comprise the battery refrigeration requirement and the passenger cabin refrigeration requirement at the same time, whether target parameters meet corresponding preset conditions or not is determined; if the target parameters meet the corresponding preset conditions, the refrigeration operation rotating speed of an electric compressor corresponding to battery refrigeration is determined based on the current battery refrigeration demand power, the battery actual water inlet temperature and the battery target cooling liquid temperature; and if the target parameters do not meet the corresponding preset conditions, the electric compressor refrigeration operation rotating speed corresponding to passenger cabin refrigeration is determined based on the current passenger cabin refrigeration demand power, the actual evaporator temperature and the target evaporator temperature. By adopting the technical scheme provided by the invention, the safety requirement of the battery is considered while the comfort of the passenger cabin is fully considered, the energy consumption utilization efficiency is effectively improved, and the comfort of the passenger cabin is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle refrigeration technology, and in particular to a speed control method and device for an electric compressor and a vehicle. Background Art

[0002] Electric vehicles are gradually becoming the mainstream development trend of the automotive industry. Electric compressors play a core role in the air conditioning system of electric vehicles. The speed regulation, noise control, energy consumption optimization, cooling capacity distribution between cabin cooling and battery cooling, and refrigerant circuit system protection of the compressor are all key links in compressor control.

[0003] However, during the operation of the compressor, there will be speed fluctuations, frequent starts and stops, excessive noise, uneven distribution of cooling capacity, etc., and under high load conditions, the refrigerant system is prone to overpressure. These problems will affect the cabin comfort and battery cooling effect to a certain extent. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a method, device and vehicle for controlling the speed of an electric compressor. The present application fully considers the comfort of the cabin while taking into account the safety requirements of the battery, effectively improving the energy utilization efficiency and enhancing the comfort of the cabin.

[0005] This application mainly includes the following aspects:

[0006] In a first aspect, an embodiment of the present application provides a speed control method for an electric compressor, the control method comprising:

[0007] Obtain the cooling requirements of the vehicle;

[0008] If the cooling demand includes both the battery cooling demand and the cabin cooling demand, determining whether the target parameter meets the corresponding preset conditions; the target parameter includes the battery cell temperature and / or the battery cooling level;

[0009] If the target parameters meet the corresponding preset conditions, the cooling operation speed of the electric compressor corresponding to the battery cooling is determined based on the current battery cooling demand power, the actual battery water inlet temperature and the battery target coolant temperature;

[0010] If the target parameter does not meet the corresponding preset conditions, the cooling operating speed of the electric compressor corresponding to the cabin cooling is determined based on the current cabin cooling demand power, the actual evaporator temperature and the target evaporator temperature.

[0011] Preferably, the target parameter satisfies corresponding preset conditions including at least one of the following items: the battery cell temperature is greater than a preset temperature, and the battery cooling level is greater than a preset cooling level.

[0012] Preferably, the step of determining the refrigeration operation speed of the electric compressor corresponding to the battery refrigeration based on the current battery refrigeration demand power, the actual battery water inlet temperature and the battery target coolant temperature includes:

[0013] Determine the initial speed of the electric compressor corresponding to the current battery cooling power requirement based on the mapping relationship between the battery cooling power requirement and the initial speed of the electric compressor;

[0014] Determining the deviation between the initial speed of the electric compressor and the cooling operation speed of the electric compressor corresponding to the battery cooling based on the difference between the actual water inlet temperature of the battery and the target coolant temperature of the battery;

[0015] The sum of the initial rotation speed and the deviation is determined as the cooling operation rotation speed of the electric compressor corresponding to battery cooling.

[0016] Preferably, determining the cooling operation speed of the electric compressor corresponding to the cabin cooling based on the current cabin cooling demand power, the actual evaporator temperature and the target evaporator temperature includes:

[0017] Determining the initial speed of the electric compressor corresponding to the current cabin cooling power requirement based on a mapping relationship between the cabin cooling power requirement and the initial speed of the electric compressor;

[0018] determining, based on a difference between an actual evaporator temperature and a target evaporator temperature, a deviation between an initial speed of the electric compressor and a cooling operation speed of the electric compressor corresponding to cabin cooling;

[0019] The sum of the initial rotation speed of the electric compressor and the deviation is determined as the cooling operation rotation speed of the electric compressor corresponding to cabin cooling.

[0020] Preferably, the speed control method further includes:

[0021] Comparing the current preset protection parameter with the first preset protection threshold to determine whether to reduce the electric compressor cooling operation speed; the electric compressor cooling operation speed includes: the electric compressor cooling operation speed corresponding to battery cooling and / or the electric compressor cooling operation speed corresponding to cabin cooling;

[0022] If the refrigeration operation speed of the electric compressor is not reduced, the refrigeration operation speed of the electric compressor is determined as the target speed of the electric compressor;

[0023] If the refrigeration operation speed of the electric compressor is reduced, a speed reduction factor of the electric compressor is determined based on the first preset protection threshold and the second preset protection threshold;

[0024] Based on the speed reduction factor, determining a reduced refrigeration operation speed of the electric compressor;

[0025] Comparing the current preset protection parameter with the second preset protection threshold to determine whether to cut off the reduced refrigeration operation speed of the electric compressor;

[0026] If the reduced refrigeration operation speed of the electric compressor is not cut off, the reduced refrigeration operation speed of the electric compressor is determined as the target speed of the electric compressor;

[0027] If the cooling operation speed of the electric compressor after the reduction is cut off, the cooling operation speed of the electric compressor after the reduction is cut off is determined as the target speed of the electric compressor.

[0028] In a second aspect, an embodiment of the present application further provides a speed control device for an electric compressor, the speed control device comprising:

[0029] An acquisition module is used to acquire the cooling demand of the vehicle;

[0030] a cooling demand determination module, for determining whether a target parameter satisfies a corresponding preset condition if the cooling demand includes both a battery cooling demand and a cabin cooling demand; the target parameter includes a battery cell temperature and / or a battery cooling level;

[0031] The battery cooling speed determination module determines the cooling speed of the electric compressor corresponding to the battery cooling based on the current battery cooling demand power, the actual battery water inlet temperature and the battery target coolant temperature if the target parameters meet the corresponding preset conditions;

[0032] The cabin cooling speed determination module determines the cooling operation speed of the electric compressor corresponding to the cabin cooling based on the current cabin cooling demand power, the actual evaporator temperature and the target evaporator temperature if the target parameter does not meet the corresponding preset conditions.

[0033] Preferably, the target parameter satisfies corresponding preset conditions including at least one of the following items: the battery cell temperature is greater than a preset temperature, and the battery cooling level is greater than a preset cooling level.

[0034] Preferably, the battery cooling speed determination module is used to determine the cooling operation speed of the electric compressor corresponding to the battery cooling based on the current battery cooling demand power, the actual battery water inlet temperature and the battery target coolant temperature, and is also specifically used to:

[0035] Determine the initial speed of the electric compressor corresponding to the current battery cooling power requirement based on the mapping relationship between the battery cooling power requirement and the initial speed of the electric compressor;

[0036] Determining the deviation between the initial speed of the electric compressor and the cooling operation speed of the electric compressor corresponding to the battery cooling based on the difference between the actual water inlet temperature of the battery and the target coolant temperature of the battery;

[0037] The sum of the initial rotation speed and the deviation is determined as the cooling operation rotation speed of the electric compressor corresponding to battery cooling.

[0038] Preferably, the cabin cooling speed determination module, when used to determine the cooling operation speed of the electric compressor corresponding to the cabin cooling based on the current cabin cooling demand power, the actual evaporator temperature and the target evaporator temperature, is further specifically used to:

[0039] Determining the initial speed of the electric compressor corresponding to the current cabin cooling power requirement based on a mapping relationship between the cabin cooling power requirement and the initial speed of the electric compressor;

[0040] determining, based on a difference between an actual evaporator temperature and a target evaporator temperature, a deviation between an initial speed of the electric compressor and a cooling operation speed of the electric compressor corresponding to cabin cooling;

[0041] The sum of the initial rotation speed of the electric compressor and the deviation is determined as the cooling operation rotation speed of the electric compressor corresponding to cabin cooling.

[0042] In a third aspect, an embodiment of the present application further provides a vehicle, comprising the speed control device for the electric compressor described above.

[0043] The embodiment of the present application provides a speed control method, device and vehicle for an electric compressor. First, the cooling demand of the vehicle is obtained. When the cooling demand includes both the battery cooling demand and the cabin cooling demand, it is determined whether the target parameters including the battery cell temperature and / or the battery cooling level meet the preset conditions. If they meet the conditions, the cooling operation speed of the electric compressor corresponding to the battery cooling is determined according to the current battery cooling demand power, the actual battery water inlet temperature and the target battery coolant temperature. If they do not meet the conditions, the cooling operation speed of the electric compressor corresponding to the cabin cooling is determined according to the current cabin cooling demand power, the actual evaporator temperature and the target evaporator temperature. In this way, the cabin comfort is fully considered while taking into account the safety requirements of the battery, effectively improving the energy consumption efficiency and improving the comfort of the cabin.

[0044] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 One of the flow charts of a method for controlling the speed of an electric compressor provided in an embodiment of the present application is shown;

[0047] Figure 2 A second flowchart of a method for controlling the speed of an electric compressor provided in an embodiment of the present application is shown;

[0048] Figure 3 A third flowchart of a method for controlling the speed of an electric compressor provided in an embodiment of the present application is shown;

[0049] Figure 4 A fourth flowchart of a method for controlling the speed of an electric compressor provided in an embodiment of the present application is shown;

[0050] Figure 5 One of the structural schematic diagrams of a speed device of an electric compressor provided in an embodiment of the present application is shown;

[0051] Figure 6 A second structural schematic diagram of a speed device of an electric compressor provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0052] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art, under the guidance of the content of the present application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0053] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0054] The following methods, devices, electronic devices or computer-readable storage media of the embodiments of the present application can be applied to any scenario requiring vehicle cooling. The embodiments of the present application are not limited to specific application scenarios. Any scheme using the speed control method and device of the electric compressor provided by the embodiments of the present application is within the protection scope of the present application.

[0055] Electric vehicles are gradually becoming the mainstream development trend of the automotive industry. Electric compressors occupy a core position in the air conditioning system of electric vehicles. The speed regulation, noise control, energy consumption optimization, cooling capacity distribution between cabin cooling and battery cooling, and refrigerant circuit system protection of the compressor are all key links in compressor control. However, during the operation of the compressor, speed fluctuations, frequent starts and stops, excessive noise, and uneven cooling capacity distribution ratios will occur. Under high load conditions, the refrigerant system is prone to overpressure. These problems will affect the cabin comfort and battery cooling effect to a certain extent.

[0056] In response to the above problems, the embodiments of the present application provide a method, device and vehicle for controlling the speed of an electric compressor, which fully consider the comfort of the cabin while taking into account the safety requirements of the battery, effectively improve the energy utilization efficiency and enhance the comfort of the cabin.

[0057] To facilitate the understanding of the present application, the technical solution provided by the present application is described in detail below in conjunction with specific embodiments.

[0058] Please participate Figure 1 , Figure 1 This is one of the flow charts of a method for controlling the speed of an electric compressor provided in an embodiment of the present application.

[0059] like Figure 1 As shown in the figure, the speed control method of the electric compressor provided in the embodiment of the present application includes the following steps:

[0060] Step S101, obtaining the cooling demand of the vehicle.

[0061] In the present application, the cooling demand of the vehicle includes: the battery cooling demand and / or the cabin cooling demand.

[0062] Step S102, if the cooling demand includes both the battery cooling demand and the cabin cooling demand, determine whether the target parameter meets the corresponding preset condition; the target parameter includes the battery cell temperature and / or the battery cooling level. As an example, the target parameter meets the corresponding preset condition including at least one of the following items: the battery cell temperature is greater than the preset temperature, and the battery cooling level is greater than the preset cooling level.

[0063] Here, if the cooling demand includes both the battery cooling demand and the cabin cooling demand, a cooling conflict occurs, so it is necessary to determine the priority of the battery cooling demand and the cabin cooling demand. The battery cell temperature being greater than the preset temperature means that among the temperature values ​​presented by each battery cell, the maximum temperature exceeds the first preset temperature. The preset cooling level is the level corresponding to the second preset temperature at which a set number of battery cells in the battery pack do not exceed. When a set number of battery cells in the battery pack exceeds the second preset temperature, it is determined that there is a risk, and the battery pack sends battery cooling level information higher than the preset cooling level to the controller.

[0064] Step S103, if the target parameter meets the corresponding preset conditions, the cooling operation speed of the electric compressor corresponding to the battery cooling is determined based on the current battery cooling demand power, the actual battery water inlet temperature and the battery target coolant temperature.

[0065] Next, combine Figure 2 To illustrate how to determine the cooling operating speed of the electric compressor corresponding to the battery cooling based on the current battery cooling demand power, the actual battery water inlet temperature and the battery target coolant temperature.

[0066] Please participate Figure 2 , Figure 2 This is a second flow chart of a method for controlling the speed of an electric compressor provided in an embodiment of the present application.

[0067] like Figure 2 As shown in , regarding determining the cooling operation speed of the electric compressor corresponding to the battery cooling based on the current battery cooling demand power, the actual battery water inlet temperature and the battery target coolant temperature, in specific implementation, as an example, the following steps are included:

[0068] Step S1031 : determining the initial speed of the electric compressor corresponding to the current battery cooling power requirement based on the mapping relationship between the battery cooling power requirement and the initial speed of the electric compressor.

[0069] Here, the battery cooling power requirement is based on the actual battery water inlet temperature and the battery target coolant temperature, and the mapping relationship is obtained through experiments, theoretical calculations or statistical analysis of actual operating data. As an example, when the battery cooling power requirement is 17kW, the corresponding electric compressor initial speed is 1200 rpm.

[0070] 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 the battery cooling.

[0071] Here, the difference between the actual water inlet temperature of the battery and the target coolant temperature of the battery is taken as the PID deviation. 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 the battery cooling can be determined by formula (1).

[0072]

[0073] Among them, Δn1 is the deviation between the initial speed of the electric compressor corresponding to the current battery cooling power demand and the cooling speed of the electric compressor corresponding to the battery cooling, K p is the proportionality coefficient, K i is the integration coefficient, K d is the differential coefficient, and e1(t) is the difference between the actual water inlet temperature of the battery and the target coolant temperature of the battery at time t.

[0074] Step S1033: determining the sum of the initial rotation speed and the deviation as the cooling operation speed of the electric compressor corresponding to battery cooling.

[0075] Here, the initial speed of the electric compressor corresponding to the current battery cooling demand power is used as the feedforward of the PID. As an example, the cooling operation speed of the electric compressor corresponding to the battery cooling can be determined by formula (2).

[0076] n i1 =n 01 +Δn1 (2)

[0077] Among them, n i1 is the electric compressor cooling speed corresponding to battery cooling, n 01 It is the initial speed of the electric compressor corresponding to the current battery cooling power demand.

[0078] Step S104: if the target parameter does not meet the corresponding preset condition, the cooling operation speed of the electric compressor corresponding to the cabin cooling is determined based on the current cabin cooling demand power, the actual evaporator temperature and the target evaporator temperature.

[0079] Next, combine Figure 3 To illustrate how to determine the cooling operation speed of the electric compressor corresponding to the cabin cooling based on the current cabin cooling demand power, the actual evaporator temperature and the target evaporator temperature.

[0080] Please participate Figure 3 , Figure 3 This is a third flow chart of a method for controlling the speed of an electric compressor provided in an embodiment of the present application.

[0081] like Figure 3As shown in , regarding determining the cooling operation speed of the electric compressor corresponding to the cabin cooling based on the current cabin cooling demand power, the actual evaporator temperature and the target evaporator temperature, in specific implementation, as an example, the following steps are included:

[0082] Step S1041 : determining the initial speed of the electric compressor corresponding to the current required power for cooling the cabin based on the mapping relationship between the required power for cooling the cabin and the initial speed of the electric compressor.

[0083] Step S1042: determining a deviation between an initial rotation speed of the electric compressor and a cooling operation rotation speed of the electric compressor corresponding to cabin cooling based on a difference between an actual evaporator temperature and a target evaporator temperature.

[0084] Here, the difference between the actual evaporator temperature and the target evaporator temperature is used as the PID deviation. 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 the cabin cooling can be determined by formula (3).

[0085]

[0086] Wherein, 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 the cabin cooling, and e2(t) is the difference between the actual evaporator temperature and the target evaporator temperature at time t.

[0087] Step S1043: determining the sum of the initial speed of the electric compressor and the deviation as the cooling operation speed of the electric compressor corresponding to cabin cooling.

[0088] Here, the initial speed of the electric compressor corresponding to the current cabin cooling demand power is used as the feedforward of the PID. As an example, the cooling operation speed of the electric compressor corresponding to the cabin cooling can be determined by formula (4).

[0089] n i2 =n 02 +Δn2 (4)

[0090] Among them, n i2 is the cooling speed of the electric compressor corresponding to cabin cooling, n 02 It is the initial speed of the electric compressor corresponding to the current cabin cooling demand power.

[0091] Please participate Figure 4 , Figure 4 This is a fourth flow chart of a method for controlling the speed of an electric compressor provided in an embodiment of the present application.

[0092] like Figure 4 As shown in , the speed control method also includes:

[0093] Step S105, comparing the current preset protection parameter with the first preset protection threshold to determine whether to reduce the electric compressor refrigeration operating speed; the electric compressor refrigeration operating speed includes: the electric compressor refrigeration operating speed corresponding to battery refrigeration and / or the electric compressor refrigeration operating speed corresponding to cabin refrigeration.

[0094] Here, the preset protection parameters in this application are parameters in the refrigerant circuit, and the preset protection parameters include: high pressure, low pressure, etc., and the safe and stable operation of the refrigerant circuit is ensured by real-time monitoring of the preset protection parameters. When the preset protection parameters exceed the normal range, measures such as reducing the speed or cutting off the compressor speed are taken to prevent the system from malfunctioning or being damaged, wherein the refrigerant circuit is provided with: a compressor, an electronic expansion valve, a stop valve, an evaporator, a condenser, a battery cooler, a battery, a pressure sensor, and a temperature sensor.

[0095] Specifically, two preset protection thresholds are set in the present application: 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.

[0096] Step S106: If the cooling operation speed of the electric compressor is not to be reduced, the cooling operation speed of the electric compressor is determined as the target speed of the electric compressor.

[0097] Step S107: if the speed of the electric compressor for cooling operation is reduced, a speed reduction factor of the electric compressor is determined based on the first preset protection threshold and the second preset protection threshold.

[0098] Here, as an example, the speed reduction factor of the electric compressor may be determined by formula (5).

[0099]

[0100] Among them, P is the preset protection parameter, and Factor is the speed reduction factor of the electric compressor.

[0101] Step S108: determining a reduced refrigeration operation speed of the electric compressor based on the speed reduction factor.

[0102] Here, as an example, the reduced cooling operation speed of the electric compressor can be determined by formula (6).

[0103] n=n0×(1-Factor) (6)

[0104] Wherein, n is the reduced refrigeration operation speed of the electric compressor, and n0 is the refrigeration operation speed of the electric compressor.

[0105] Step S109: Compare the current preset protection parameter with the second preset protection threshold value to determine whether to cut off the reduced refrigeration operation speed of the electric compressor.

[0106] Specifically, the current preset protection parameter is compared with the second preset protection threshold Hp2.

[0107] In step S110, if the reduced cooling operation speed of the electric compressor is not cut off, the reduced cooling operation speed of the electric compressor is determined as the target speed of the electric compressor.

[0108] In step S111, if the cooling operation speed of the electric compressor is cut off and reduced, the cooling operation speed of the electric compressor is determined as the target speed of the electric compressor.

[0109] Steps S105 - S111 will be described below with reference to specific examples.

[0110] As an example, assume that the preset protection parameter is high pressure, and pressure and temperature sensors are provided at the air inlet and exhaust port of the compressor. The preset protection parameter is high pressure to avoid 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, which may be caused by abnormal refrigerant flow, poor heat dissipation and other reasons. At this time, the compressor speed begins to decrease to reduce the compression amount of the refrigerant, 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 safety range, and continued operation may cause serious damage to the system. Therefore, it is necessary to cut off the compressor speed and stop the system to avoid danger.

[0111] In an embodiment of the present application, when the passenger cabin is cooled, the preset protection parameters related to the passenger cabin cooling are compared with the corresponding preset protection thresholds; when the battery is cooled, the preset protection parameters related to the battery cooling are compared with the corresponding preset protection thresholds; when the battery and the passenger cabin are cooled at the same time, the preset protection parameters related to the battery cooling and the preset protection parameters related to the passenger cabin cooling are compared with the corresponding preset protection thresholds. In this way, when a single cabin / single battery is cooled, protection is performed based on fewer conditions, which can simplify the protection logic, reduce the complexity of calculations and judgments, and improve the timeliness and accuracy of the protection response, thereby more efficiently ensuring the safe and stable operation of the refrigerant circuit.

[0112] The present application provides a method for controlling the speed of an electric compressor. Through the method, the comfort of the cabin is fully considered while taking into account the safety requirements of the battery, thereby effectively improving the energy consumption efficiency and enhancing the comfort of the cabin.

[0113] Based on the same application concept, the embodiment of the present application also provides an electric compressor speed control device corresponding to the electric compressor speed control method provided in the above embodiment. Since the principle of solving the problem by the device in the embodiment of the present application is similar to the electric compressor speed control method in the above embodiment of the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0114] like Figures 5 and 6 As shown, Figure 5 This is one of the structural schematic diagrams of a speed device of an electric compressor provided in an embodiment of the present application. Figure 6 This is a second structural schematic diagram of a speed device of an electric compressor provided in an embodiment of the present application.

[0115] like Figure 5 As shown in , the embodiment of the present application further provides a speed control device for an electric compressor, and the speed control device 510 includes:

[0116] An acquisition module 511 is used to acquire the cooling demand of the vehicle;

[0117] A cooling demand determination module 512, if the cooling demand includes both the battery cooling demand and the cabin cooling demand, determines whether the target parameter meets the corresponding preset condition; the target parameter includes the battery cell temperature and / or the battery cooling level;

[0118] The battery cooling speed determination module 513 determines the cooling speed of the electric compressor corresponding to the battery cooling based on the current battery cooling demand power, the actual battery water inlet temperature and the battery target coolant temperature if the target parameter meets the corresponding preset conditions;

[0119] The cabin cooling speed determination module 514 determines the cooling operation speed of the electric compressor corresponding to the cabin cooling based on the current cabin cooling demand power, the actual evaporator temperature and the target evaporator temperature if the target parameter does not meet the corresponding preset condition.

[0120] Preferably, the target parameter satisfies corresponding preset conditions including at least one of the following items: the battery cell temperature is greater than a preset temperature, and the battery cooling level is greater than a preset cooling level.

[0121] Preferably, the battery cooling speed determination module 513 is further specifically used to:

[0122] Determine the initial speed of the electric compressor corresponding to the current battery cooling power requirement based on the mapping relationship between the battery cooling power requirement and the initial speed of the electric compressor;

[0123] Determining the deviation between the initial speed of the electric compressor and the cooling operation speed of the electric compressor corresponding to the battery cooling based on the difference between the actual water inlet temperature of the battery and the target coolant temperature of the battery;

[0124] The sum of the initial rotation speed and the deviation is determined as the cooling operation rotation speed of the electric compressor corresponding to battery cooling.

[0125] Preferably, the battery cooling speed determination module 514, when used to determine the cooling operation speed of the electric compressor corresponding to the cabin cooling based on the current cabin cooling demand power, the actual evaporator temperature and the target evaporator temperature, is further specifically used to:

[0126] Determining the initial speed of the electric compressor corresponding to the current cabin cooling power requirement based on a mapping relationship between the cabin cooling power requirement and the initial speed of the electric compressor;

[0127] determining, based on a difference between an actual evaporator temperature and a target evaporator temperature, a deviation between an initial speed of the electric compressor and a cooling operation speed of the electric compressor corresponding to cabin cooling;

[0128] The sum of the initial speed of the electric compressor and the deviation is determined as the cooling operation speed of the electric compressor corresponding to cabin cooling.

[0129] like Figure 6 As shown in , preferably, the speed control device 510 also includes:

[0130] The speed comparison module 515 compares the current preset protection parameter with the first preset protection threshold to determine whether to reduce the electric compressor cooling operation speed; the electric compressor cooling operation speed includes: the electric compressor cooling operation speed corresponding to battery cooling and / or the electric compressor cooling operation speed corresponding to cabin cooling;

[0131] The target speed determination module 516 determines the refrigeration operation speed of the electric compressor as the target speed of the electric compressor if the refrigeration operation speed of the electric compressor is not to be reduced;

[0132] A speed reduction factor determination module 517 determines a speed reduction factor of the electric compressor based on a first preset protection threshold and a second preset protection threshold if the speed of the electric compressor is reduced for cooling operation;

[0133] A speed reduction determination module 518 determines a reduced speed of the electric compressor for cooling operation based on the speed reduction factor;

[0134] The speed cut-off determination module 519 compares the current preset protection parameter with the second preset protection threshold value to determine whether to cut off the reduced refrigeration operation speed of the electric compressor;

[0135] The target speed selection module 520 determines the reduced refrigeration operation speed of the electric compressor as the target speed of the electric compressor if the reduced refrigeration operation speed of the electric compressor is not cut off;

[0136] The cut-off target speed selection module 521 determines the cut-off reduced cooling operation speed of the electric compressor as the target speed of the electric compressor if the cut-off reduced cooling operation speed of the electric compressor is cut-off.

[0137] The present application provides a speed control device for an electric compressor. Through the device, the comfort of the cabin is fully considered while taking into account the safety requirements of the battery, thereby effectively improving the energy consumption efficiency and enhancing the comfort of the cabin.

[0138] An embodiment of the present application also provides a vehicle, which includes the speed control device of the electric compressor described above.

[0139] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0140] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0141] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0142] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0143] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for controlling the speed of an electric compressor, characterized in that: The speed control method comprises: Obtain the cooling requirements of the vehicle; If the cooling demand includes both the battery cooling demand and the cabin cooling demand, determining whether the target parameter meets the corresponding preset conditions; the target parameter includes the battery cell temperature and / or the battery cooling level; If the target parameters meet the corresponding preset conditions, the cooling operation speed of the electric compressor corresponding to the battery cooling is determined based on the current battery cooling demand power, the actual battery water inlet temperature and the battery target coolant temperature; If the target parameter does not meet the corresponding preset conditions, the cooling operating speed of the electric compressor corresponding to the cabin cooling is determined based on the current cabin cooling demand power, the actual evaporator temperature and the target evaporator temperature.

2. The speed control method according to claim 1, characterized in that: The target parameter satisfies corresponding preset conditions including at least one of the following items: the battery cell temperature is greater than a preset temperature, and the battery cooling level is greater than a preset cooling level.

3. The speed control method according to claim 2, characterized in that: The step of determining the cooling operation speed of the electric compressor corresponding to the battery cooling based on the current battery cooling demand power, the actual battery water inlet temperature and the battery target coolant temperature includes: Determine the initial speed of the electric compressor corresponding to the current battery cooling power requirement based on the mapping relationship between the battery cooling power requirement and the initial speed of the electric compressor; Determining the deviation between the initial speed of the electric compressor and the cooling operation speed of the electric compressor corresponding to the battery cooling based on the difference between the actual water inlet temperature of the battery and the target coolant temperature of the battery; The sum of the initial rotation speed and the deviation is determined as the cooling operation rotation speed of the electric compressor corresponding to battery cooling.

4. The speed control method according to claim 2, characterized in that: The step of determining the cooling operation speed of the electric compressor corresponding to the cabin cooling based on the current cabin cooling demand power, the actual evaporator temperature, and the target evaporator temperature includes: Determining the initial speed of the electric compressor corresponding to the current cabin cooling power requirement based on a mapping relationship between the cabin cooling power requirement and the initial speed of the electric compressor; determining, based on a difference between an actual evaporator temperature and a target evaporator temperature, a deviation between an initial speed of the electric compressor and a cooling operation speed of the electric compressor corresponding to cabin cooling; The sum of the initial speed of the electric compressor and the deviation is determined as the cooling operation speed of the electric compressor corresponding to cabin cooling.

5. The speed control method according to claim 1, characterized in that: The speed control method further comprises: Comparing the current preset protection parameter with the first preset protection threshold to determine whether to reduce the electric compressor cooling operation speed; the electric compressor cooling operation speed includes: the electric compressor cooling operation speed corresponding to battery cooling and / or the electric compressor cooling operation speed corresponding to cabin cooling; If the refrigeration operation speed of the electric compressor is not reduced, the refrigeration operation speed of the electric compressor is determined as the target speed of the electric compressor; If the refrigeration operation speed of the electric compressor is reduced, a 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 speed reduction factor, determining a reduced refrigeration operation speed of the electric compressor; Comparing the current preset protection parameter with the second preset protection threshold to determine whether to cut off the reduced refrigeration operation speed of the electric compressor; If the reduced refrigeration operation speed of the electric compressor is not cut off, the reduced refrigeration operation speed of the electric compressor is determined as the target speed of the electric compressor; If the cooling operation speed of the electric compressor after the reduction is cut off, the cooling operation speed of the electric compressor after the reduction is cut off is determined as the target speed of the electric compressor.

6. A speed control device for an electric compressor, characterized in that: The speed control device comprises: An acquisition module is used to acquire the cooling demand of the vehicle; a cooling demand determination module, for determining whether a target parameter satisfies a corresponding preset condition if the cooling demand includes both a battery cooling demand and a cabin cooling demand; the target parameter includes a battery cell temperature and / or a battery cooling level; The battery cooling speed determination module determines the cooling speed of the electric compressor corresponding to the battery cooling based on the current battery cooling demand power, the actual battery water inlet temperature and the battery target coolant temperature if the target parameters meet the corresponding preset conditions; The cabin cooling speed determination module determines the cooling operation speed of the electric compressor corresponding to the cabin cooling based on the current cabin cooling demand power, the actual evaporator temperature and the target evaporator temperature if the target parameter does not meet the corresponding preset conditions.

7. The speed control device according to claim 6, characterized in that: The target parameter satisfies corresponding preset conditions including at least one of the following items: the battery cell temperature is greater than a preset temperature, and the battery cooling level is greater than a preset cooling level.

8. The rotation speed control device according to claim 7, characterized in that: The battery cooling speed determination module is used to determine the cooling operation speed of the electric compressor corresponding to the battery cooling based on the current battery cooling demand power, the actual battery water inlet temperature and the battery target coolant temperature, and is also specifically used to: Determine the initial speed of the electric compressor corresponding to the current battery cooling power requirement based on the mapping relationship between the battery cooling power requirement and the initial speed of the electric compressor; Determining the deviation between the initial speed of the electric compressor and the cooling operation speed of the electric compressor corresponding to the battery cooling based on the difference between the actual water inlet temperature of the battery and the target coolant temperature of the battery; The sum of the initial rotation speed and the deviation is determined as the cooling operation rotation speed of the electric compressor corresponding to battery cooling.

9. The speed control device according to claim 7, characterized in that: The cabin cooling speed determination module is used to determine the cooling operation speed of the electric compressor corresponding to the cabin cooling based on the current cabin cooling demand power, the actual evaporator temperature and the target evaporator temperature, and is also specifically used to: Determining the initial speed of the electric compressor corresponding to the current cabin cooling power requirement based on a mapping relationship between the cabin cooling power requirement and the initial speed of the electric compressor; determining, based on a difference between an actual evaporator temperature and a target evaporator temperature, a deviation between an initial speed of the electric compressor and a cooling operation speed of the electric compressor corresponding to cabin cooling; The sum of the initial speed of the electric compressor and the deviation is determined as the cooling operation speed of the electric compressor corresponding to cabin cooling.

10. A vehicle, characterized in that: The vehicle includes the rotation speed control device for the electric compressor according to any one of claims 6 to 9.

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