Motor control method, medium and device for electric vehicle

Abstract

This invention discloses a motor control method, medium, and device for electric vehicles. The method includes: acquiring real-time status information of the electric vehicle and calculating the current temperature of the components based on component parameters and the real-time status information; obtaining a corresponding derating factor based on the current temperature of the components; determining the maximum carrying current corresponding to the real-time status information according to the derating factor; calculating the corresponding maximum carrying power according to the maximum carrying current; and determining the motor power according to the maximum carrying power. This method can effectively control the operating temperature of the passive high-voltage power carrier, thereby reducing the risk of spontaneous combustion during the charging process of electric vehicles and improving the safety of electric vehicle use.

Description

Technical Field

[0001] This application relates to the field of electric vehicle control technology, and in particular to a motor control method, medium and device for an electric vehicle. Background Technology

[0002] Electric vehicles are transportation vehicles that use electricity as their power source and are driven by a traction electric motor. With the advancement of technology, electric vehicles are becoming increasingly popular and have become one of the main means of transportation for people's daily travel.

[0003] In related technologies, spontaneous combustion incidents frequently occur during the charging process of electric vehicles. One contributing factor is the excessively high temperature of the charging cables and high-voltage bus connectors, coupled with a lack of effective temperature control. This significantly impacts the safety of electric vehicle operation. Therefore, effectively controlling the temperature of the passive high-voltage power carrier (E-Axle drive motor system, high-voltage battery connector, and cable between the high-voltage battery and E-Axle) has become one of the most pressing issues to be addressed in the electric vehicle field. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to provide a motor control method for electric vehicles that can effectively control the operating temperature of the passive high-voltage power carrier fluid, thereby reducing the risk of spontaneous combustion during the charging process of electric vehicles and improving the safety of electric vehicle use.

[0005] According to an embodiment of the present invention, a motor control method for an electric vehicle includes: acquiring real-time status information of the electric vehicle, and calculating the current temperature of the components based on the parameters of the components and the real-time status information; acquiring a corresponding derating factor based on the current temperature of the components; determining the maximum carrying current corresponding to the real-time status information according to the derating factor, calculating the corresponding maximum carrying power according to the maximum carrying current, and determining the power of the motor according to the maximum carrying power.

[0006] According to an embodiment of the present invention, a motor control method for an electric vehicle firstly acquires real-time status information of the electric vehicle and calculates the current temperature of the components based on the parameters of the components and the real-time status information; then, it acquires a corresponding derating factor based on the current temperature of the components; then, it determines the maximum carrying current corresponding to the real-time status information based on the derating factor, calculates the corresponding maximum carrying power based on the maximum carrying current, and determines the power of the motor based on the maximum carrying power; thereby achieving effective control of the operating temperature of the passive high-voltage power carrier, reducing the risk of spontaneous combustion during the charging process of the electric vehicle, and improving the safety of the electric vehicle.

[0007] In some embodiments, the current temperature of the component is calculated according to the following formula:

[0008]

[0009]

[0010]

[0011] in, Indicates the current resistance value of the component. Indicates the current on the high-voltage bus side of the motor, Indicates the heat capacity of the components, Indicates temperature difference value, Indicates time difference, Indicates the thermal conductivity of air, Indicates the current temperature of the component, Indicates the current ambient temperature, Indicates the resistance value of the component under standard temperature conditions. Indicates standard temperature, This represents the temperature coefficient.

[0012] In some embodiments, obtaining the corresponding derating factor based on the current temperature of the component includes: querying a preset component temperature and derating factor lookup table according to the current temperature of the component to determine the derating factor corresponding to the current temperature of the component.

[0013] In some embodiments, determining the motor power based on the maximum load capacity includes: obtaining a preset power allocated to the motor by the vehicle and the maximum power of the connector; comparing the maximum load capacity, the preset power of the motor, and the maximum power of the connector to determine the minimum value among the maximum load capacity, the preset power of the motor, and the maximum power of the connector, and using the minimum value as the power of the motor.

[0014] In some embodiments, the method further includes: calculating the maximum resistance value of the component, calculating the maximum DC current value of the component based on the maximum resistance value, and determining the maximum allowable DC current value of the component based on the maximum DC current value; and determining the maximum output torque of the motor based on the maximum allowable DC current value and the current temperature of the component.

[0015] In some embodiments, the maximum resistance value of the component is calculated according to the following formula:

[0016]

[0017] in, Indicates the maximum resistance value of the component. Indicates the resistance value of the component under standard temperature conditions. Indicates temperature coefficient, Indicates the maximum operating temperature of the component. Indicates the standard temperature.

[0018] In some embodiments, the maximum DC current value of the component is calculated according to the following formula:

[0019]

[0020]

[0021] in, This indicates the maximum DC current value of the component under the first time condition. Indicates the current temperature of the component, Indicates the heat capacity of the components, The value represents the maximum DC current of the component under the second time condition. A represents the first time, and B represents the second time.

[0022] In some embodiments, the maximum permissible DC current value of the component is calculated according to the following formula:

[0023]

[0024]

[0025] in, This indicates the maximum permissible DC current value of the component under the first-time condition. This indicates the maximum allowable DC current value for the motor under the first-time condition. Indicates the current temperature of the motor assembly. This indicates the maximum discharge current value of the high-voltage battery under the first instantaneous condition. Indicates the current temperature of the high-voltage battery. This indicates the maximum current carrying capacity of the high-voltage cable under the first-time condition. Indicates the current temperature of the high-voltage component cables. This indicates the maximum permissible DC current value of the component under the second time condition. Indicates the maximum DC current of the motor under the second time condition. This indicates the maximum discharge current value of the high-voltage battery under the second time condition. This indicates the maximum current carrying capacity of the high-voltage cable assembly under the second time condition.

[0026] Secondly, embodiments of the present invention provide a computer-readable storage medium storing a motor control program for an electric vehicle, which, when executed by a processor, implements the motor control method for an electric vehicle as described above.

[0027] According to an embodiment of the present invention, a computer-readable storage medium stores a motor control program for an electric vehicle, so that when a processor executes the motor control program, it implements the motor control method for the electric vehicle as described above; thereby achieving effective control of the operating temperature of the passive high-voltage power carrier fluid, reducing the risk of spontaneous combustion during the charging process of the electric vehicle, and improving the safety of the electric vehicle.

[0028] Thirdly, embodiments of the present invention propose a motor control device for an electric vehicle, comprising: a calculation module, which is used to acquire real-time status information of the electric vehicle and calculate the current temperature of the components based on the parameters of the components and the real-time status information; a query module, which is used to acquire a corresponding derating factor based on the current temperature of the components; the calculation module is further used to determine the maximum carrying current corresponding to the real-time status information according to the derating factor, calculate the corresponding maximum carrying power according to the maximum carrying current, and determine the power of the motor according to the maximum carrying power.

[0029] According to an embodiment of the present invention, a motor control device for an electric vehicle includes a calculation module for acquiring real-time status information of the electric vehicle and calculating the current temperature of the components based on the parameters of the components and the real-time status information; a query module for acquiring a corresponding derating factor based on the current temperature of the components; the calculation module is further configured to determine the maximum carrying current corresponding to the real-time status information based on the derating factor, calculate the corresponding maximum carrying power based on the maximum carrying current, and determine the power of the motor based on the maximum carrying power, thereby effectively controlling the operating temperature of the passive high-voltage power carrier, reducing the risk of spontaneous combustion during the charging process of the electric vehicle, and improving the safety of the electric vehicle.

[0030] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] Figure 1 This is a schematic flowchart of a motor control method for an electric vehicle according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic flowchart of a motor control method for an electric vehicle according to another embodiment of the present invention;

[0033] Figure 3This is a block diagram of a motor control device for an electric vehicle according to an embodiment of the present invention. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] The motor control method for an electric vehicle according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0036] Please see Figure 1 , Figure 1 This is a flowchart illustrating a motor control method for an electric vehicle according to an embodiment of the present invention, as shown below. Figure 1 As shown, the motor control method for this electric vehicle includes the following steps:

[0037] S101 acquires the real-time status information of the electric vehicle and calculates the current temperature of the components based on the component parameters and the real-time status information.

[0038] The real-time status information of electric vehicles can include various parameters. As an example, real-time status information may include the current resistance value of the electric vehicle's components (which may include various parts and connectors of the electric vehicle), the current value on the high-voltage bus side, and the ambient temperature; the parameters of the components may include: component heat capacity, air thermal conductivity, temperature coefficient, etc.

[0039] In some embodiments, the current temperature of the component is calculated according to the following formula:

[0040]

[0041]

[0042]

[0043] in, Indicates the current resistance value of the component. Indicates the current on the high-voltage bus side of the motor, Indicates the heat capacity of the components, Indicates temperature difference value, Indicates time difference, Indicates the thermal conductivity of air, Indicates the current temperature of the component, Indicates the current ambient temperature, Indicates the resistance value of the component under standard temperature conditions. Indicates standard temperature, This represents the temperature coefficient.

[0044] It should be noted that there are several ways to select the standard temperature. For example, the standard temperature can be set to 25℃ or 30℃; preferably, 20℃ can be used as the standard temperature. No specific value for the standard temperature is limited here.

[0045] S102, obtain the corresponding derating factor based on the current temperature of the component.

[0046] In some embodiments, obtaining the corresponding derating factor based on the current temperature of the component includes: querying a preset component temperature and derating factor lookup table based on the current temperature of the component to determine the derating factor corresponding to the current temperature of the component.

[0047] As an example, the components include: a motor high-voltage connector, a battery high-voltage connector, and a high-voltage busbar; the corresponding component temperature and derating factor comparison table is shown in Table 1:

[0048]

[0049] Table 1

[0050] Table 1 shows the derating factor for each component based on its current temperature. This derating factor is a control parameter, and its value is inversely correlated with the component's current temperature; that is, the higher the current temperature, the lower the derating factor. This derating factor indirectly defines the dangerous level of the component's current operating temperature. Therefore, by using the derating factor, the maximum current carrying capacity can be reasonably adjusted when the component's current temperature is too high, thus limiting the motor's power and preventing the component's operating temperature from becoming excessively high.

[0051] S103 determines the maximum carrying current corresponding to the real-time status information based on the derating factor, calculates the corresponding maximum carrying power based on the maximum carrying current, and determines the power of the motor based on the maximum carrying power.

[0052] In some embodiments, determining the motor power based on the maximum load capacity includes: obtaining the preset power allocated to the motor by the vehicle and the maximum power of the connector; comparing the maximum load capacity, the preset power of the motor, and the maximum power of the connector to determine the minimum value among the maximum load capacity, the preset power of the motor, and the maximum power of the connector, and using the minimum value as the power of the motor.

[0053] In some embodiments, to further improve the safety of electric vehicles, the control method further includes: calculating the maximum resistance value of a component, calculating the maximum DC current value of the component based on the maximum resistance value, and determining the maximum permissible DC current value of the component based on the maximum DC current value; and determining the maximum output torque of the motor based on the maximum permissible DC current value and the current temperature of the component.

[0054] In some embodiments, the maximum resistance value of the component is calculated according to the following formula:

[0055]

[0056] in, Indicates the maximum resistance value of the component. Indicates the resistance value of the component under standard temperature conditions. Indicates temperature coefficient, Indicates the maximum operating temperature of the component. Indicates the standard temperature.

[0057] In some embodiments, the maximum DC current value of the component is calculated according to the following formula:

[0058]

[0059]

[0060] in, This indicates the maximum DC current value of the component under the first time condition. Indicates the current temperature of the component, Indicates the heat capacity of the components, The value represents the maximum DC current of the component under the second time condition. A represents the first time, and B represents the second time.

[0061] There are several ways to select the first and second times. For example, the first time can be 5 seconds and the second time can be 10 seconds; or the first time can be 10 seconds and the second time can be 20 seconds; preferably, the first time can be set to 30 seconds and the second time to 5 seconds; the specific values ​​of the first and second times are not limited here.

[0062] In some embodiments, the maximum permissible DC current value of the component is calculated according to the following formula:

[0063]

[0064]

[0065] in, This indicates the maximum permissible DC current value of the component under the first-time condition. This indicates the maximum allowable DC current value for the motor under the first-time condition. Indicates the current temperature of the motor assembly. This indicates the maximum discharge current value of the high-voltage battery under the first instantaneous condition. Indicates the current temperature of the high-voltage battery. This indicates the maximum current carrying capacity of the high-voltage cable under the first-time condition. Indicates the current temperature of the high-voltage component cables. This indicates the maximum permissible DC current value of the component under the second time condition. Indicates the maximum DC current of the motor under the second time condition. This indicates the maximum discharge current value of the high-voltage battery under the second time condition. This indicates the maximum current carrying capacity of the high-voltage cable assembly under the second time condition.

[0066] As an example, firstly, after calculating the current temperature of the component, the derating factor corresponding to the current temperature of the component is obtained by referring to Table 1. Next, the maximum resistance value of the component is calculated, and the maximum DC current value of the component is calculated based on the maximum resistance value, and the maximum allowable DC current value of the component is determined based on the maximum DC current value. Then, the corresponding maximum carrying current is calculated according to the formula derating factor * maximum allowable DC current value = maximum carrying current, and the corresponding maximum carrying power is calculated based on the maximum carrying current. Next, the preset power allocated to the motor by the whole vehicle and the maximum power of the connector are obtained; electrical power * conversion efficiency (electrical power converted to mechanical power) = mechanical power, T = 9550 * P / n; T: torque to be executed by the motor, Nm; P: mechanical power kW; n: motor speed r / min; then, the maximum carrying power, the preset power of the motor and the maximum power of the connector are compared to obtain the minimum value, and this minimum value is taken as the power of the motor. Next, the maximum output torque of the motor is determined based on the maximum allowable DC current value of the components and the current temperature of the components, so as to limit the temperature of the high-voltage connector and the high-voltage bus and ensure the safe use of electric vehicles.

[0067] According to a specific embodiment of the present invention, such as Figure 2 As shown, the control method includes the following steps:

[0068] S201, obtains real-time status information of electric vehicles and parameters of components.

[0069] S202 calculates the current temperature of the component based on the component's parameters and real-time status information.

[0070] S203, calculate the maximum resistance value of the component.

[0071] S204 calculates the maximum DC current value of the component based on the maximum resistance value, and determines the maximum allowable DC current value based on the maximum DC current value.

[0072] S205 determines the maximum output torque of the motor based on the maximum allowable DC current value and the current temperature of the components.

[0073] S206: Based on the current temperature of the component, query the preset component temperature and derating factor comparison table to determine the derating factor corresponding to the current temperature of the component.

[0074] S207, calculate the corresponding maximum carrying power based on the derating factor and the maximum allowable DC current value.

[0075] S208, obtains the preset power allocated to the motor by the whole vehicle and the maximum power of the connector.

[0076] S209 compares the maximum load power, the motor's preset power, and the connector's maximum power to obtain the minimum value.

[0077] S210 uses the minimum value as the motor power.

[0078] In summary, the electric vehicle motor control method according to an embodiment of the present invention first acquires the real-time status information of the electric vehicle and calculates the current temperature of the components based on the parameters of the components and the real-time status information; then, it acquires the corresponding derating factor based on the current temperature of the components; then, it determines the maximum carrying current corresponding to the real-time status information according to the derating factor, calculates the corresponding maximum carrying power according to the maximum carrying current, and determines the power of the motor according to the maximum carrying power; thereby achieving effective control of the operating temperature of the passive high-voltage power carrier, reducing the risk of spontaneous combustion during the charging process of the electric vehicle, and improving the safety of the electric vehicle.

[0079] To implement the above embodiments, this invention provides a computer-readable storage medium storing a motor control program for an electric vehicle, which, when executed by a processor, implements the motor control method for the electric vehicle as described above.

[0080] According to an embodiment of the present invention, a computer-readable storage medium stores a motor control program for an electric vehicle, so that when a processor executes the motor control program, it implements the motor control method for the electric vehicle as described above; thereby achieving effective control of the operating temperature of the passive high-voltage power carrier fluid, reducing the risk of spontaneous combustion during the charging process of the electric vehicle, and improving the safety of the electric vehicle.

[0081] To achieve the above embodiments, this invention provides a motor control device for electric vehicles, such as... Figure 3 As shown, the motor control device of the electric vehicle includes a calculation module 10 and a query module 20.

[0082] The calculation module 10 is used to obtain the real-time status information of the electric vehicle and calculate the current temperature of the component based on the component parameters and the real-time status information.

[0083] The query module 20 is used to obtain the corresponding derating factor based on the current temperature of the component;

[0084] The calculation module 10 is also used to determine the maximum carrying current corresponding to the real-time status information based on the derating factor, calculate the corresponding maximum carrying power based on the maximum carrying current, and determine the power of the motor based on the maximum carrying power.

[0085] In some embodiments, the current temperature of the component is calculated according to the following formula:

[0086]

[0087]

[0088]

[0089] in, Indicates the current resistance value of the component. Indicates the current on the high-voltage bus side of the motor, Indicates the heat capacity of the components, Indicates temperature difference value, Indicates time difference, Indicates the thermal conductivity of air, Indicates the current temperature of the component, Indicates the current ambient temperature, Indicates the resistance value of the component under standard temperature conditions. Indicates temperature coefficient, Indicates the standard temperature.

[0090] In some embodiments, the query module 20 is further configured to query a preset component temperature and derating factor lookup table based on the current temperature of the component, so as to determine the derating factor corresponding to the current temperature of the component.

[0091] In some embodiments, the calculation module 10 is further configured to obtain the preset power allocated to the motor by the vehicle and the maximum power of the connector; compare the maximum load power, the preset power of the motor and the maximum power of the connector to determine the minimum value among the maximum load power, the preset power of the motor and the maximum power of the connector, and use the minimum value as the power of the motor.

[0092] In some embodiments, the calculation module 10 is further configured to calculate the maximum resistance value of the component, calculate the maximum DC current value of the component based on the maximum resistance value, determine the maximum allowable DC current value of the component based on the maximum DC current value, and determine the maximum output torque of the motor based on the maximum allowable DC current value and the current temperature of the component.

[0093] In some embodiments, the maximum resistance value of the component is calculated according to the following formula:

[0094]

[0095] in, Indicates the maximum resistance value of the component. Indicates the resistance value of the component under standard temperature conditions. Indicates temperature coefficient, Indicates the maximum operating temperature of the component. Indicates the standard temperature.

[0096] In some embodiments, the maximum DC current value of the component is calculated according to the following formula:

[0097]

[0098]

[0099] in, This indicates the maximum DC current value of the component under the first time condition. Indicates the current temperature of the component, Indicates the heat capacity of the components, This indicates the maximum DC current value of the component under the second time condition.

[0100] In some embodiments, the maximum permissible DC current value of the component is calculated according to the following formula:

[0101]

[0102]

[0103] in, This indicates the maximum permissible DC current value of the component under the first-time condition. This indicates the maximum allowable DC current value for the motor under the first-time condition. Indicates the current temperature of the motor assembly. This indicates the maximum discharge current value of the high-voltage battery under the first instantaneous condition. Indicates the current temperature of the high-voltage battery. This indicates the maximum current carrying capacity of the high-voltage cable under the first-time condition. Indicates the current temperature of the high-voltage component cables. This indicates the maximum permissible DC current value of the component under the second time condition. Indicates the maximum DC current of the motor under the second time condition. This indicates the maximum discharge current value of the high-voltage battery under the second time condition. This indicates the maximum current carrying capacity of the high-voltage cable assembly under the second time condition.

[0104] It should be noted that the above description of the motor control method for electric vehicles also applies to the motor control device of the electric vehicle, and will not be repeated here.

[0105] In summary, the electric vehicle motor control device according to embodiments of the present invention includes a calculation module for acquiring real-time status information of the electric vehicle and calculating the current temperature of the components based on the parameters of the components and the real-time status information; a query module for acquiring a corresponding derating factor based on the current temperature of the components; and the calculation module for determining the maximum carrying current corresponding to the real-time status information based on the derating factor, calculating the corresponding maximum carrying power based on the maximum carrying current, and determining the power of the motor based on the maximum carrying power, thereby effectively controlling the operating temperature of the passive high-voltage power carrier, reducing the risk of spontaneous combustion during the charging process of the electric vehicle, and improving the safety of the electric vehicle.

[0106] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0107] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0108] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0109] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0110] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0111] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0112] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0113] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A motor control method of an electric vehicle, characterized by, include: The system acquires real-time status information of the electric vehicle and calculates the current temperature of the components based on the parameters of the components and the real-time status information. The components include: a motor high-voltage connector, a battery high-voltage connector, and a high-voltage bus. The parameters of the components include: component thermal capacity, air thermal conductivity, and temperature coefficient. The real-time status information includes the current resistance value of the components of the electric vehicle, the current value on the high-voltage bus side, and the ambient temperature. The corresponding derating factor is obtained based on the current temperature of the component. Calculate the maximum resistance value of the component, calculate the maximum DC current value of the component based on the maximum resistance value, and determine the maximum allowable DC current value of the component based on the maximum DC current value; The maximum carrying current corresponding to the real-time status information is determined based on the derating factor and the maximum allowable DC current value, and the corresponding maximum carrying power is calculated based on the maximum carrying current, and the power of the motor is determined based on the maximum carrying power. The maximum output torque of the motor is determined based on the maximum allowable DC current value and the current temperature of the components. Determining the motor power based on the maximum load capacity includes: Obtain the preset power allocated to the motor and the maximum power of the connector by the whole vehicle; The maximum load capacity, the preset power of the motor, and the maximum power of the connector are compared to determine the minimum value among the maximum load capacity, the preset power of the motor, and the maximum power of the connector, and the minimum value is taken as the power of the motor.

2. The electric motor control method of an electric vehicle according to claim 1, characterized by, The current temperature of the component is calculated according to the following formula: wherein, represents the current resistance value of the component, represents the motor high-voltage bus side current, represents the thermal capacity of the component, represents the temperature difference, represents the time difference, represents the air heat transfer coefficient, represents the current temperature of the component, represents the current ambient temperature, represents the resistance value of the component under standard temperature conditions, represents the standard temperature, represents the temperature coefficient.

3. The motor control method for an electric vehicle as described in claim 1, characterized in that, The corresponding derating factor is obtained based on the current temperature of the component, including: The derating factor corresponding to the current temperature of the component is determined by querying a preset component temperature and derating factor lookup table based on the current temperature of the component.

4. The motor control method for an electric vehicle as described in claim 1, characterized in that, The maximum resistance value of the component is calculated according to the following formula: in, Indicates the maximum resistance value of the component. Indicates the resistance value of the component under standard temperature conditions. Indicates temperature coefficient, Indicates the maximum operating temperature of the component. Indicates the standard temperature.

5. The motor control method for an electric vehicle as described in claim 4, characterized in that, The maximum DC current value of the component is calculated according to the following formula: in, This indicates the maximum DC current value of the component under the first time condition. Indicates the current temperature of the component, Indicates the heat capacity of the components, The value represents the maximum DC current of the component under the second time condition. A represents the first time, and B represents the second time.

6. The motor control method for an electric vehicle as described in claim 5, characterized in that, The maximum permissible DC current value of the component is calculated according to the following formula: in, This indicates the maximum permissible DC current value of the component under the first-time condition. This indicates the maximum allowable DC current value for the motor under the first-time condition. Indicates the current temperature of the motor assembly. This indicates the maximum discharge current value of the high-voltage battery under the first instantaneous condition. Indicates the current temperature of the high-voltage battery. This indicates the maximum current carrying capacity of the high-voltage cable under the first-time condition. Indicates the current temperature of the high-voltage cable. This indicates the maximum permissible DC current value of the component under the second time condition. Indicates the maximum DC current of the motor under the second time condition. This indicates the maximum discharge current value of the high-voltage battery under the second time condition. This indicates the maximum current carrying capacity of the high-voltage cable under the second time condition.

7. A computer-readable storage medium, characterized in that, It stores a motor control program for an electric vehicle, which, when executed by a processor, implements the motor control method for an electric vehicle as described in any one of claims 1-6.

8. A motor control device for an electric vehicle, characterized in that, The apparatus for implementing the motor control method for an electric vehicle as described in any one of claims 1-6 includes: A calculation module is used to acquire real-time status information of the electric vehicle and calculate the current temperature of the components based on the parameters of the components and the real-time status information. A query module is used to obtain the corresponding derating factor based on the current temperature of the component. The calculation module is also used to determine the maximum carrying current corresponding to the real-time status information based on the derating factor, calculate the corresponding maximum carrying power based on the maximum carrying current, and determine the power of the motor based on the maximum carrying power.

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