New energy vehicle power control method, device and equipment and readable storage medium

Abstract

This application provides a power control method, device, electronic device, and computer-readable storage medium for new energy vehicles. The power control method includes: acquiring the available charge / discharge power of the battery from the battery management system; determining the available charge / discharge power of the motor based on the available charge / discharge power of the battery; acquiring the current efficiency and current speed of the motor; calculating the current torque limit of the motor based on the available charge / discharge power, current efficiency, and current speed of the motor; converting the available charge / discharge power of the battery into a motor torque limit; and calculating the final available torque limit of the motor based on the motor torque limit, the motor's own available torque limit, and the vehicle status. According to the embodiments of this application, precise control of the motor torque request can be achieved, and the over-limit of battery output power can be avoided to the greatest extent, thus extending battery life.

Description

Technical Field

[0001] This application belongs to the field of new energy vehicle electrical systems, and in particular relates to a power control method, device, electronic equipment, and computer-readable storage medium for new energy vehicles. Background Technology

[0002] like Figure 1 As shown, in an electric vehicle power control method, the vehicle controller determines the battery pack power limiting strategy based on the battery management system's maximum allowable discharge power and maximum allowable charging power, combined with the electric vehicle's current state information. Based on this strategy, it sends a power limiting command to the motor controller, which then controls the motor to execute the power limiting strategy. Existing technology determines the battery pack's power limiting strategy based on the battery pack's current maximum allowable discharge power, maximum allowable charging power, and current vehicle state information to achieve charging and discharging power control.

[0003] However, the shortcomings of the existing technical solutions are discussed in two points:

[0004] 1. The existing technical solution only considers the available charging and discharging power of the battery and the vehicle status information to confirm the power limit command and send the power limit command and power limit value to the motor controller. It does not convert the power limit value into a torque limit value, does not consider the available discharge torque limit value and the available charging torque limit value of the motor, and does not comprehensively consider all factors affecting the torque limit value of the motor controller to confirm the torque limit value of the motor controller.

[0005] 2. Existing technical solutions only determine the available power limit of the motor controller based on the available charging and discharging power of the battery. The motor controller determines the output torque based on the available power limit of the battery. However, it does not consider limiting the available power of the motor controller when the actual power of the battery exceeds the battery power limit in order to adjust the actual power of the battery and thus maximize the extension of battery life.

[0006] In view of the above, this application is hereby submitted. Summary of the Invention

[0007] This application provides a power control method, device, electronic device, and computer-readable storage medium for new energy vehicles, which can achieve precise control of motor torque request and minimize battery output power exceeding limits, thereby extending battery life.

[0008] In a first aspect, embodiments of this application provide a power control method for a new energy vehicle, including:

[0009] Obtain the available charge / discharge power of the battery from the battery management system;

[0010] The available charging and discharging power of the motor is determined based on the available charging and discharging power of the battery.

[0011] Get the current motor efficiency and current motor speed;

[0012] Calculate the current torque limit of the motor based on the available charging and discharging power of the motor, the current efficiency of the motor, and the current speed of the motor.

[0013] The motor torque limit is obtained based on the conversion of the battery's available charge and discharge power.

[0014] The final available torque limit of the motor is calculated based on the motor torque limit, the motor's own available torque limit, and the vehicle status.

[0015] Furthermore, the method also includes:

[0016] The actual power of the battery is compared with the battery's available power limit in real time, and an overpower judgment threshold is obtained by subtracting a safety margin from the battery's available power limit.

[0017] When the actual power of the battery exceeds the overpower judgment threshold, calculation begins and the power correction coefficient is obtained by looking up a table based on the time when the actual power of the battery exceeds the power limit.

[0018] Furthermore, the method also includes:

[0019] The corrected available charging and discharging power of the motor is obtained by multiplying the power correction factor by the available charging and discharging power of the motor.

[0020] Furthermore, the method also includes:

[0021] The battery's first-level safe power threshold is obtained by subtracting an offset from the overpower judgment threshold.

[0022] When the actual power of the battery is less than the first-level safety power threshold, the battery over-power timer stops and the current timing result is maintained.

[0023] Furthermore, the method also includes:

[0024] Subtract an offset from the first-level safety power to obtain the second-level safety power threshold;

[0025] When the actual power of the battery is less than the secondary safety power threshold, the timing result is reset to zero and no further power correction is performed.

[0026] Furthermore, based on the battery's available charge and discharge power, the motor's available charge and discharge power is determined, including:

[0027] The available discharge power of the motor is obtained by subtracting the current power of the high-voltage accessory from the available discharge power of the battery.

[0028] The available charging power of the motor is obtained by adding the current power of the high-voltage accessory to the available charging power of the battery.

[0029] The available discharge power and the available charging power of the motor are respectively reduced by a safety margin to obtain the available charging and discharging power of the motor.

[0030] Furthermore, the current motor efficiency and current motor speed are obtained, including:

[0031] The current efficiency of the motor is determined based on the current battery voltage, current motor speed, and current torque.

[0032] Secondly, embodiments of this application provide a power control device for a new energy vehicle, comprising:

[0033] The first acquisition module is used to acquire the available charge and discharge power of the battery in the battery management system;

[0034] The power determination module is used to determine the available charge and discharge power of the motor based on the available charge and discharge power of the battery.

[0035] The second acquisition module is used to acquire the current efficiency and current speed of the motor.

[0036] The current torque limit calculation module is used to calculate the current torque limit of the motor based on the available charging and discharging power of the motor, the current efficiency of the motor, and the current speed of the motor.

[0037] The conversion module is used to convert the available charge and discharge power of the battery to obtain the motor torque limit;

[0038] The final available torque limit calculation module for the motor is used to calculate the final available torque limit of the motor based on the motor torque limit, the motor's own available torque limit, and the vehicle status.

[0039] Furthermore, the device also includes:

[0040] The overpower judgment threshold acquisition module is used to compare the actual power of the battery with the battery's available power limit in real time, and obtain the overpower judgment threshold by subtracting a safety margin from the battery's available power limit.

[0041] The power correction coefficient acquisition module is used to start calculating and obtain the power correction coefficient by looking up a table based on the time when the actual battery power exceeds the overpower judgment threshold.

[0042] Furthermore, the device also includes:

[0043] The corrected motor available charge / discharge power acquisition module is used to multiply the power correction coefficient and the motor available charge / discharge power to obtain the corrected motor available charge / discharge power.

[0044] Furthermore, the device also includes:

[0045] The Level 1 Safety Power Threshold Acquisition Module is used to obtain the Level 1 Safety Power Threshold of the battery by subtracting an offset from the Overpower Judgment Threshold.

[0046] The timing result acquisition module is used to stop the battery over-power time timing and maintain the current timing result when the actual battery power is less than the first-level safety power threshold.

[0047] Furthermore, the device also includes:

[0048] The secondary safety power threshold acquisition module is used to obtain the secondary safety power threshold by subtracting an offset from the primary safety power.

[0049] The timing result reset module is used to reset the timing result to zero when the actual battery power is less than the secondary safety power threshold, and no further power correction will be performed.

[0050] Furthermore, the power determination module is used to: subtract the current power of the high-voltage accessory from the available discharge power of the battery to obtain the available discharge power of the motor; add the current power of the high-voltage accessory to the available charging power of the battery to obtain the available charging power of the motor; and subtract a safety margin from both the available discharge power and the available charging power of the motor to obtain the available charging and discharging power of the motor.

[0051] Furthermore, the second acquisition module is used to determine the current efficiency of the motor based on the current battery voltage, the current motor speed, and the current torque.

[0052] Thirdly, embodiments of this application provide an electronic device, which includes: a processor and a memory storing computer program instructions;

[0053] When the processor executes computer program instructions, it implements the new energy vehicle power control method as shown in the first aspect.

[0054] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer program instructions, which, when executed by a processor, implement the new energy vehicle power control method as described in the first aspect.

[0055] The new energy vehicle power control method, device, electronic device, and computer-readable storage medium of the present application embodiments can achieve precise control of motor torque request and minimize battery output power exceeding limits, thereby extending battery life.

[0056] The new energy vehicle power control method includes: obtaining the available charge and discharge power of the battery from the battery management system; determining the available charge and discharge power of the motor based on the available charge and discharge power of the battery; obtaining the current efficiency and current speed of the motor; calculating the current torque limit of the motor based on the available charge and discharge power of the motor, the current efficiency of the motor, and the current speed of the motor; converting the available charge and discharge power of the battery to obtain the motor torque limit; and calculating the final available torque limit of the motor based on the motor torque limit, the available torque limit of the motor itself, and the vehicle status.

[0057] As can be seen, this method determines the available charging and discharging power of the motor based on the battery's available charging and discharging power limit, converts the available charging and discharging power of the motor into the available charging and discharging torque of the motor, and finally determines the available charging and discharging limit of the motor based on the available charging and discharging torque limit of the motor obtained from the conversion of the battery's available charging and discharging power, the available charging and discharging torque limit of the motor itself, and the vehicle status. After limiting the torque required by the driver, it requests the motor controller to output torque, thereby achieving precise control of the motor torque request.

[0058] The vehicle controller monitors the battery's available charge and discharge power limit and actual battery power in real time. When the actual power exceeds the battery's available charge and discharge power limit, it adjusts the battery's actual output power by adjusting the motor's available charge and discharge power, thereby minimizing the possibility of the battery's output power exceeding the limit and extending the battery's lifespan. Attached Figure Description

[0059] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0060] Figure 1 This is a schematic diagram of the system structure;

[0061] Figure 2 This is a schematic flowchart of a power control method for new energy vehicles provided in one embodiment of this application;

[0062] Figure 3 This is a schematic diagram illustrating the calculation of motor torque limit and power correction coefficient according to an embodiment of this application;

[0063] Figure 4 This is a schematic diagram of the structure of a new energy vehicle power control device provided in one embodiment of this application;

[0064] Figure 5 This is a schematic diagram of the structure of an electronic device provided in one embodiment of this application. Detailed Implementation

[0065] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0067] To address the problems of the prior art, embodiments of this application provide a power control method, apparatus, electronic device, and computer-readable storage medium for new energy vehicles. The power control method for new energy vehicles provided in this application embodiment will be described first below.

[0068] Figure 2 A schematic flowchart of a power control method for new energy vehicles according to an embodiment of this application is shown. Figure 2 As shown, the power control method for new energy vehicles includes:

[0069] S201. Obtain the available charge / discharge power of the battery from the battery management system;

[0070] The system components of this invention include: a vehicle controller, a motor and a motor controller, a battery management system, and a battery pack;

[0071] like Figure 3 As shown, specifically, the vehicle controller obtains the available charge and discharge power limits of the battery management system.

[0072] S202. Determine the available charging and discharging power of the motor based on the available charging and discharging power of the battery;

[0073] In one embodiment, determining the available charging and discharging power of the motor based on the available charging and discharging power of the battery includes:

[0074] The available discharge power of the motor is obtained by subtracting the current power of the high-voltage accessory from the available discharge power of the battery.

[0075] The available charging power of the motor is obtained by adding the current power of the high-voltage accessory to the available charging power of the battery.

[0076] The available discharge power and the available charging power of the motor are respectively reduced by a safety margin to obtain the available charging and discharging power of the motor.

[0077] Specifically, the available discharge power of the motor is obtained by subtracting the current power of the high-voltage accessory from the available discharge power of the battery, and the available charging power of the motor is obtained by adding the current power of the high-voltage accessory to the available charging power of the battery. The available charging and discharging power of the motor is obtained by subtracting the safety margin from each of these values.

[0078] S203. Obtain the current motor efficiency and current motor speed;

[0079] In one embodiment, obtaining the current efficiency and current speed of the motor includes: determining the current efficiency of the motor based on the current battery voltage, the current speed of the motor, and the current torque.

[0080] Specifically, the current efficiency of the motor, the efficiency of the motor in drive mode, and the efficiency in regeneration mode are obtained separately. Taking drive as an example, three efficiency maps are set according to the motor's highest operating voltage, rated operating voltage, and lowest operating voltage. The current efficiency of the motor is then determined by combining the current battery voltage, the current motor speed, and the current torque.

[0081] S204. Calculate the current torque limit of the motor based on the available charging and discharging power of the motor, the current efficiency of the motor, and the current speed of the motor;

[0082] S205. The motor torque limit is obtained based on the conversion of the available charge and discharge power of the battery.

[0083] S206. Calculate the final available torque limit of the motor based on the motor torque limit, the motor's own available torque limit, and the vehicle status.

[0084] Specifically, the final available torque limit of the motor is calculated by combining the motor torque limit obtained from the conversion of the battery's available charge and discharge power, the motor's own available torque limit, and the vehicle's status, and the driver's target torque is limited within this range.

[0085] In one embodiment, the method further includes:

[0086] The actual power of the battery is compared with the battery's available power limit in real time, and an overpower judgment threshold is obtained by subtracting a safety margin from the battery's available power limit.

[0087] When the actual power of the battery exceeds the overpower judgment threshold, calculation begins and the power correction coefficient is obtained by looking up a table based on the time when the actual power of the battery exceeds the power limit.

[0088] In one embodiment, the method further includes:

[0089] The corrected available charging and discharging power of the motor is obtained by multiplying the power correction factor by the available charging and discharging power of the motor.

[0090] In one embodiment, the method further includes:

[0091] The battery's first-level safe power threshold is obtained by subtracting an offset from the overpower judgment threshold.

[0092] When the actual power of the battery is less than the first-level safety power threshold, the battery over-power timer stops and the current timing result is maintained.

[0093] In one embodiment, the method further includes:

[0094] Subtract an offset from the first-level safety power to obtain the second-level safety power threshold;

[0095] When the actual power of the battery is less than the secondary safety power threshold, the timing result is reset to zero and no further power correction is performed.

[0096] In summary, the available charging and discharging power of the motor is determined by the available charging and discharging power limit of the battery, and the available charging and discharging power of the motor is converted into the available charging and discharging torque of the motor. Based on the available charging and discharging torque limit of the motor obtained from the conversion of the available charging and discharging power of the battery, the available charging and discharging torque limit of the motor itself, and the vehicle status, the final available charging and discharging limit of the motor is determined. After limiting the torque demanded by the driver, the motor controller is requested to output torque. The torque request to the motor can be precisely controlled according to the changes in the available charging and discharging power of the battery and the changes in the available torque of the motor.

[0097] Three motor efficiency maps are set for the motor charging and discharging states respectively. When the battery voltage is higher than the motor's maximum operating voltage or lower than the motor's minimum operating voltage, the efficiency maps corresponding to the motor's maximum and minimum operating voltages are used respectively. When the battery voltage is between the motor's maximum and minimum operating voltages, the range of the battery voltage is confirmed, and two efficiency values ​​are obtained by looking up the table according to the motor's current torque and current speed. The weighting coefficients corresponding to the two efficiency values ​​are determined according to the current battery voltage, and the final motor efficiency value is obtained by weighted calculation.

[0098] The system monitors the actual battery power and the battery power limit in real time. When the actual power exceeds the battery's available charge and discharge power limit, it obtains a power correction coefficient based on the battery power exceeding the limit time and adjusts the motor's available charge and discharge power to achieve actual battery output power regulation.

[0099] The available charging and discharging power of the motor is determined based on the battery's available charging and discharging power limit, and then converted into the motor's available charging and discharging torque. The motor's available charging and discharging torque limit is finally determined based on the motor's available charging and discharging torque limit obtained from the battery's available charging and discharging power conversion, the motor's own available charging and discharging torque limit, and the vehicle status. After limiting the torque demanded by the driver, the motor controller is requested to output torque. The torque request to the motor can be precisely controlled according to the changes in the battery's available charging and discharging power and the motor's available torque.

[0100] The vehicle controller monitors the battery's available charge and discharge power limit and actual battery power in real time. When the actual power exceeds the battery's available charge and discharge power limit, it adjusts the battery's actual output power by adjusting the motor's available charge and discharge power, thereby minimizing the possibility of the battery's output power exceeding the limit and extending the battery's lifespan.

[0101] Figure 4 This is a schematic diagram of the structure of a new energy vehicle power control device according to an embodiment of this application. The new energy vehicle power control device includes:

[0102] The first acquisition module 401 is used to acquire the available charge and discharge power of the battery in the battery management system;

[0103] The power determination module 402 is used to determine the available charge and discharge power of the motor based on the available charge and discharge power of the battery;

[0104] The second acquisition module 403 is used to acquire the current efficiency and current speed of the motor.

[0105] The motor current torque limit calculation module 404 is used to calculate the motor current torque limit based on the motor's available charging and discharging power, the motor's current efficiency, and the motor's current speed.

[0106] Conversion module 405 is used to convert the available charge and discharge power of the battery to obtain the motor torque limit;

[0107] The final available torque limit calculation module 406 is used to calculate the final available torque limit of the motor based on the motor torque limit, the motor's own available torque limit, and the vehicle status.

[0108] In one embodiment, the apparatus further includes:

[0109] The overpower judgment threshold acquisition module is used to compare the actual power of the battery with the battery's available power limit in real time, and obtain the overpower judgment threshold by subtracting a safety margin from the battery's available power limit.

[0110] The power correction coefficient acquisition module is used to start calculating and obtain the power correction coefficient by looking up a table based on the time when the actual battery power exceeds the overpower judgment threshold.

[0111] In one embodiment, the apparatus further includes:

[0112] The corrected motor available charge / discharge power acquisition module is used to multiply the power correction coefficient and the motor available charge / discharge power to obtain the corrected motor available charge / discharge power.

[0113] In one embodiment, the apparatus further includes:

[0114] The Level 1 Safety Power Threshold Acquisition Module is used to obtain the Level 1 Safety Power Threshold of the battery by subtracting an offset from the Overpower Judgment Threshold.

[0115] The timing result acquisition module is used to stop the battery over-power time timing and maintain the current timing result when the actual battery power is less than the first-level safety power threshold.

[0116] In one embodiment, the apparatus further includes:

[0117] The secondary safety power threshold acquisition module is used to obtain the secondary safety power threshold by subtracting an offset from the primary safety power.

[0118] The timing result reset module is used to reset the timing result to zero when the actual battery power is less than the secondary safety power threshold, and no further power correction will be performed.

[0119] In one embodiment, the power determination module 402 is configured to: subtract the current power of the high-voltage accessory from the available discharge power of the battery to obtain the available discharge power of the motor; add the current power of the high-voltage accessory to the available charging power of the battery to obtain the available charging power of the motor; and subtract a safety margin from the available discharge power and the available charging power of the motor to obtain the available charging and discharging power of the motor.

[0120] In one embodiment, the second acquisition module 403 is used to determine the current efficiency of the motor based on the current battery voltage, the current motor speed, and the current torque.

[0121] Figure 4 Each module in the illustrated device has the ability to implement Figure 2 The functions of each step in the process and their corresponding technical effects are described in detail here for the sake of brevity.

[0122] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of this application is shown.

[0123] The electronic device may include a processor 501 and a memory 502 storing computer program instructions.

[0124] Specifically, the processor 501 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0125] Memory 502 may include mass storage for data or instructions. For example, and not limitingly, memory 502 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 502 may include removable or non-removable (or fixed) media. Where appropriate, memory 502 may be internal or external to an electronic device. In a particular embodiment, memory 502 may be a non-volatile solid-state memory.

[0126] In one embodiment, memory 502 may be read-only memory (ROM). In one embodiment, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these.

[0127] The processor 501 reads and executes computer program instructions stored in the memory 502 to implement any of the new energy vehicle power control methods in the above embodiments.

[0128] In one example, the electronic device may also include a communication interface 503 and a bus 510. Wherein, as... Figure 5 As shown, the processor 501, memory 502, and communication interface 503 are connected through bus 510 and complete communication with each other.

[0129] The communication interface 503 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0130] Bus 510 includes hardware, software, or both, that couples components of an electronic device together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 510 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, this application contemplates any suitable bus or interconnect.

[0131] Furthermore, in conjunction with the new energy vehicle power control method in the above embodiments, this application embodiment can provide a computer-readable storage medium for implementation. This computer-readable storage medium stores computer program instructions; when these computer program instructions are executed by a processor, they implement any of the new energy vehicle power control methods in the above embodiments.

[0132] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0133] The functional modules shown in the above-described block diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0134] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0135] The aspects of this application have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by dedicated hardware performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0136] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A power control method for new energy vehicles, characterized in that, include: Obtain the available charge / discharge power of the battery from the battery management system; Based on the available charge and discharge power of the battery, determine the available charge and discharge power of the motor; Get the current motor efficiency and current motor speed; Calculate the current torque limit of the motor based on the available charging and discharging power of the motor, the current efficiency of the motor, and the current speed of the motor; Based on the current torque limit of the motor, the available torque limit of the motor itself, and the vehicle status, calculate the final available torque limit of the motor. The step of determining the available charging and discharging power of the motor based on the available charging and discharging power of the battery includes: The available discharge power of the motor is obtained by subtracting the current power of the high-voltage accessory from the available discharge power of the battery. The available charging power of the motor is obtained by adding the current power of the high-voltage accessory to the available charging power of the battery. The available discharge power and the available charging power of the motor are respectively subtracted from the safety margin to obtain the available charging and discharging power of the motor. The actual power of the battery is compared with the battery's available power limit in real time, and an overpower judgment threshold is obtained by subtracting a safety margin from the battery's available power limit. When the actual battery power exceeds the overpower judgment threshold, timing begins and the power correction coefficient is obtained by looking up a table based on the time when the actual battery power exceeds the power limit. The corrected available charging and discharging power of the motor is obtained by multiplying the power correction factor by the available charging and discharging power of the motor.

2. The power control method for new energy vehicles according to claim 1, characterized in that, The method further includes: By subtracting an offset from the aforementioned overpower judgment threshold, the battery's first-level safe power threshold is obtained. When the actual power of the battery is less than the first-level safety power threshold, the battery over-power timer stops and the current timing result is maintained.

3. The power control method for new energy vehicles according to claim 2, characterized in that, The method further includes: Subtract an offset from the first-level safety power to obtain the second-level safety power threshold; When the actual power of the battery is less than the secondary safety power threshold, the timing result is reset to zero and no further power correction is performed.

4. The power control method for new energy vehicles according to claim 1, characterized in that, The process of obtaining the current efficiency and current speed of the motor includes: The current efficiency of the motor is determined based on the current battery voltage, current motor speed, and current torque.

5. A power control device for new energy vehicles, characterized in that, include: The first acquisition module is used to acquire the available charge and discharge power of the battery in the battery management system; A power determination module is used to determine the available charge and discharge power of the motor based on the available charge and discharge power of the battery; The second acquisition module is used to acquire the current efficiency and current speed of the motor. The motor current torque limit calculation module is used to calculate the motor current torque limit based on the motor's available charging and discharging power, the motor's current efficiency, and the motor's current speed. The final available torque limit calculation module for the motor is used to calculate the final available torque limit of the motor based on the current torque limit of the motor, the available torque limit of the motor itself, and the vehicle status. The step of determining the available charging and discharging power of the motor based on the available charging and discharging power of the battery includes: The available discharge power of the motor is obtained by subtracting the current power of the high-voltage accessory from the available discharge power of the battery. The available charging power of the motor is obtained by adding the current power of the high-voltage accessory to the available charging power of the battery. The available discharge power and the available charging power of the motor are respectively subtracted from the safety margin to obtain the available charging and discharging power of the motor. The actual power of the battery is compared with the battery's available power limit in real time, and an overpower judgment threshold is obtained by subtracting a safety margin from the battery's available power limit. When the actual battery power exceeds the overpower judgment threshold, timing begins and the power correction coefficient is obtained by looking up a table based on the time when the actual battery power exceeds the power limit. The corrected available charging and discharging power of the motor is obtained by multiplying the power correction factor by the available charging and discharging power of the motor.

6. An electronic device, characterized in that, The electronic device includes: a processor and a memory storing computer program instructions; When the processor executes the computer program instructions, it implements the new energy vehicle power control method as described in any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions, which, when executed by a processor, implement the new energy vehicle power control method as described in any one of claims 1-4.

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