A torque distribution method and device, an electronic device, and a storage medium

Abstract

The present invention relates to a torque distribution method and device, an electronic device, and a storage medium. The method includes: obtaining the current battery temperature of a high-voltage battery operating in a low-temperature environment and the driver's required torque; determining the target charge-discharge power of the high-voltage battery at the current battery temperature according to the current battery temperature and the state of charge of the high-voltage battery; determining the required power generation power of the range extender system according to the target charge-discharge power and the actual power of the drive motor; determining the target engine speed and target engine torque of the engine and the target generator speed and target generator torque of the generator according to the power generation power and the efficiency optimal curve of the range extender system. The present invention can adjust the power generation power according to the temperature, so that the battery does not need to work near the power limit for a long time, improving the safety of the high-voltage battery and also improving the drivability; and in a low-temperature environment, the engine torque can also be kept accurate, thus ensuring the accuracy of the charging power.

Description

Technical Field

[0001] The present invention relates to the field of hybrid system control, and particularly to a torque distribution method and device, an electronic device, and a storage medium. Background Art

[0002] A series-parallel hybrid power system includes three power sources: an engine, a generator, and a motor. Its main hybrid driving modes mainly include two modes: series and parallel. In order to ensure that the sum of the torques of the three power sources can meet the driver's requirements and the system efficiency can reach the optimum.

[0003] For the system efficiency to be optimal and the torque transmitted to the wheel end to meet the driving requirements, it is necessary to coordinate the output of appropriate target torques or speeds of the above three power sources in different modes. However, in a low-temperature scenario, the charge and discharge capacity of the battery is insufficient. When the driver's demand changes rapidly, problems such as overcharging and over-discharging of the battery and poor drivability are likely to occur when calculating torque distribution according to the conventional energy management strategy. Therefore, in such a scenario, it is necessary to coordinate the torque and speed outputs of the engine, generator, and motor to ensure the power balance of the power system, and ultimately achieve the goals of ensuring the component life, driver demand, and drivability.

[0004] In the related art, there is a lack of a power generation power following scheme considering low temperature, which is not easy to respond to the driver's demand in a fierce driving process in a timely manner, and is likely to cause drivability problems. Or it does not consider the charging power deviation caused by inaccurate engine torque at low temperature, and the safety problems caused by the battery working near the power limit for a long time. Summary of the Invention

[0005] One of the purposes of the present invention is to provide a torque distribution method to solve at least one technical problem existing in the related art; the second purpose is to provide a torque distribution device; the third purpose is to provide an electronic device; the fourth purpose is to provide a storage medium.

[0006] In order to achieve the above purposes, the technical solutions adopted by the present invention are as follows:

[0007] A torque distribution method includes:

[0008] Obtaining the current battery temperature of a high-voltage battery operating in a low-temperature environment and the driver's demand torque;

[0009] Determining the target charge and discharge power of the high-voltage battery at the current battery temperature according to the current battery temperature and the state of charge of the high-voltage battery;

[0010] Determine the power generation power required by the range extender system according to the target charge-discharge power and the actual power of the drive motor, where the actual power of the drive motor is obtained based on the driver's required torque;

[0011] Determine the target engine speed and target engine torque of the engine, and the target generator speed and target generator torque of the generator according to the power generation power and the efficiency optimal curve of the range extender system.

[0012] According to the above technical means, since the target charge-discharge power is obtained according to the state of charge of the high-voltage battery and the current battery temperature, the influence on the charge-discharge power of the battery in a low-temperature environment can be effectively considered. And determine the power generation power required by the range extender system according to the target charge-discharge power and the actual power of the drive motor, so that the power generation power can also be adjusted following the temperature. Thus, the battery does not need to work near the power limit for a long time, which can effectively improve the safety of the high-voltage battery; in addition, the actual power of the drive motor is obtained based on the driver's required torque, so that the power generation power can be obtained after responding to the driver's demand, which can improve the drivability; finally, the above technical means also determine the target engine speed and target engine torque of the engine, and the target generator speed and target generator torque of the generator according to the power generation power and the efficiency optimal curve of the range extender system. Thus, even in a low-temperature environment, the torque of the engine can be kept accurate, which can further ensure the accuracy of the charging power.

[0013] Further, as in the torque distribution method described above, the determining of the target charge-discharge power of the high-voltage battery according to the current battery temperature and the state of charge of the high-voltage battery includes:

[0014] Obtain the calibration information of the high-voltage battery, where the calibration information is used to indicate the corresponding relationship between the battery temperature, the battery charge amount, and the battery charge-discharge power;

[0015] Determine the target charge-discharge power according to the calibration information, the current battery temperature, and the state of charge of the high-voltage battery.

[0016] According to the above technical means, by obtaining the calibration information of the high-voltage battery and then determining the target charge-discharge power, the efficiency of determining the target charge-discharge power can be effectively improved.

[0017] Further, as in the torque distribution method described above, the determining of the target charge-discharge power according to the calibration information, the current battery temperature, and the state of charge of the high-voltage battery includes:

[0018] Match the original target charge-discharge power in the calibration information according to the current battery temperature and the state of charge of the high-voltage battery;

[0019] Determine the actual power of the high-voltage battery according to the actual voltage and actual current of the high-voltage battery;

[0020] Perform a first closed-loop control on the original target charge-discharge power through the power deviation between the actual power and the original target charge-discharge power to obtain the target charge-discharge power, and determine the target voltage and target current of the high-voltage battery;

[0021] Perform filtering processing on the target voltage and target current.

[0022] According to the above technical means, performing a first closed-loop control on the original target charge-discharge power through the power deviation between the actual power and the original target charge-discharge power to obtain the target charge-discharge power can effectively ensure the stability and reliability of the charge and discharge of the high-voltage battery. Moreover, performing filtering processing on the target voltage and target current can further ensure the stability of the power system powered by the high-voltage battery.

[0023] Further, as in the aforementioned torque distribution method, the performing a first closed-loop control on the original target charge-discharge power through the power deviation between the actual power and the original target charge-discharge power to obtain the target charge-discharge power includes:

[0024] In the case where the power deviation indicates that the original target charge-discharge power is less than the actual power, increase the original target charge-discharge power to obtain the target charge-discharge power;

[0025] In the case where the power deviation indicates that the original target charge-discharge power is equal to the actual power, use the original target charge-discharge power as the target charge-discharge power;

[0026] In the case where the power deviation indicates that the original target charge-discharge power is greater than the actual power, decrease the original target charge-discharge power to obtain the target charge-discharge power.

[0027] According to the above technical means, the original target charge-discharge power can be adjusted in different situations to obtain the target charge-discharge power closest to the actual power.

[0028] Further, as in the aforementioned torque distribution method, the determining the engine target speed and engine target torque of the engine and the generator target speed and generator target torque of the generator according to the generated power and the efficiency optimal curve of the range extender system includes:

[0029] Determine the original target engine speed and original target engine torque of the engine, the original target generator speed and original target generator torque of the generator according to the power generation power and the efficiency optimal curve of the range extender system;

[0030] When the engine operates according to the power generation power, perform a second closed-loop control on the original target engine torque through the deviation between the actual engine speed and the original target engine speed of the engine to obtain the target engine torque;

[0031] Based on the target engine torque, obtain the target engine speed, the target generator speed and the target generator torque.

[0032] According to the above technical means, the influences of system fluctuation information, energy transfer efficiency and system error information on the power generation power can be considered, the accuracy of the engine torque can be effectively improved, and further, the charging power deviation caused by inaccurate engine torque can be avoided.

[0033] Further, as the torque distribution method described above, when the engine operates according to the power generation power, performing a second closed-loop control on the original target engine torque through the deviation between the actual engine speed and the original target engine speed of the engine to obtain the target engine torque includes:

[0034] When the original target engine speed is less than the actual engine speed, increase the original target engine speed to obtain the target engine torque;

[0035] When the original target engine speed is equal to the actual engine speed, use the original target engine speed as the target engine torque;

[0036] When the original target engine speed is greater than the actual engine speed, reduce the original target engine speed to obtain the target engine torque.

[0037] According to the above technical means, the original target engine speed can be adjusted in different situations to obtain the target engine speed that best meets the target power generation power.

[0038] Further, as the torque distribution method described above, the determination of the power generation power required by the range extender system according to the target charge-discharge power and the actual power of the drive motor includes:

[0039] Determine the power consumption of the high-voltage accessories of the vehicle where the high-voltage battery is located;

[0040] Determine the actual power of the drive motor in the vehicle;

[0041] Based on the sum of the target charge-discharge power, the power consumed by the high-voltage accessories, and the actual power, determine the generated power.

[0042] According to the above technical means, by determining the generated power based on the sum of the target charge-discharge power, the power consumed by the high-voltage accessories, and the actual power, the safety of the high-voltage battery and the stability of the system can be further ensured.

[0043] Further, as in the aforementioned torque distribution method, before obtaining the current battery temperature of the high-voltage battery operating in a low-temperature environment and the driver's demand torque, the method further includes:

[0044] When the current ambient temperature is lower than or equal to the lower temperature limit indicated by the battery information of the high-voltage battery, determine that the high-voltage battery is operating in the low-temperature environment, and perform a jump operation to execute the obtaining of the current battery temperature of the high-voltage battery operating in the low-temperature environment and the driver's demand torque.

[0045] According to the above technical means, it is possible to timely and accurately determine whether the high-voltage battery is operating in a low-temperature environment, and then timely enter the low-temperature operation mode, and ensure the continuous operation of the engine and the high-voltage battery in this mode.

[0046] Further, as in the aforementioned torque distribution method, the determining the actual power of the drive motor in the vehicle includes:

[0047] Assign the driver's demand torque to the drive torque demand of the drive motor;

[0048] Send the drive torque demand to the dual-motor controller;

[0049] Control the drive motor through the dual-motor controller, and determine the actual power of the drive motor.

[0050] According to the above technical means, the dual-motor controller can be controlled according to the driver's demand torque, so as to be able to respond to the driver's demand in a timely manner.

[0051] According to another aspect of the present application, there is also provided a torque distribution device, including:

[0052] An acquisition module for acquiring the current battery temperature of the high-voltage battery operating in a low-temperature environment and the driver's demand torque;

[0053] A first determination module, configured to determine a target charge-discharge power of the high-voltage battery at the current battery temperature according to the current battery temperature and the state of charge of the high-voltage battery;

[0054] A second determination module, configured to determine the power generation power required by the range extender system according to the target charge-discharge power of the battery and the actual power of the drive motor, wherein the actual power of the drive motor is obtained based on the driver's required torque;

[0055] A third determination module, configured to determine an original target engine speed and an original target engine torque of the engine, an original target generator speed and an original target generator torque of the generator according to the power generation power and the efficiency optimal curve of the range extender system.

[0056] According to another aspect of the present application, there is also provided an electronic device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory complete communication with each other through the communication bus,

[0057] The memory is used to store a computer program;

[0058] The processor is configured to execute the method steps as described in any one of the preceding items by running the computer program stored on the memory.

[0059] According to another aspect of the present application, there is also provided a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to execute the method steps as described in any one of the preceding items when running.

[0060] Advantages of the present invention:

[0061] (1) In the present invention, the target charge-discharge power is obtained according to the state of charge of the high-voltage battery and the current battery temperature. Therefore, the influence on the charge-discharge power of the battery in a low-temperature environment can be effectively considered, and the power generation power required by the range extender system is determined according to the target charge-discharge power and the actual power of the drive motor, so that the power generation power can also be adjusted following the temperature. Thus, the battery does not need to work near the power limit for a long time, and the safety of the high-voltage battery can be effectively improved.

[0062] (2) The actual power of the drive motor in the present invention is obtained based on the driver's required torque, so that the power generation power can be obtained after responding to the driver's demand, thereby improving drivability.

[0063] (3) The present invention also determines the target engine speed and target engine torque of the engine, and the target generator speed and target generator torque of the generator according to the generated power and the optimal efficiency curve of the range extender system. Thus, even in a low-temperature environment, the torque of the engine can be maintained accurately, and further, the accuracy of the charging power can be ensured. Description of the Drawings

[0064] Figure 1 It is a schematic flowchart of a torque distribution method in an embodiment of the present application;

[0065] Figure 2 It is a schematic diagram of a series-parallel hybrid system in an embodiment of the present application;

[0066] Figure 3 It is a schematic flowchart of a torque distribution method in another embodiment of the present application;

[0067] Figure 4 It is a schematic flowchart of a torque distribution method in another embodiment of the present application;

[0068] Figure 5 It is a schematic diagram of a closed-loop control of the target charge and discharge power of a battery in an embodiment of the present application;

[0069] Figure 6 It is a schematic flowchart of a torque distribution method in another embodiment of the present application;

[0070] Figure 7 It is a schematic diagram of a closed-loop control of the target engine torque in an embodiment of the present application;

[0071] Figure 8 It is a schematic flowchart of a torque distribution method in an embodiment of the present application;

[0072] Figure 9 It is a schematic flowchart of a closed-loop control method applied to a torque distribution method in an application example of the present application;

[0073] Figure 10 It is a schematic flowchart of a torque distribution method in an application example of the present application;

[0074] Figure 11 It is a structural block diagram of an optional torque distribution device according to an embodiment of the present application;

[0075] Figure 12 It is a structural block diagram of an optional electronic device according to an embodiment of the present application. Detailed Embodiments

[0076] To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0077] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances, so that the embodiments of this application described here can be implemented in an order different from those illustrated or described here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0078] According to one aspect of the embodiments of this application, a torque distribution method is provided. Optionally, in this embodiment, the above torque distribution method can be applied to a hardware environment composed of a terminal and a server. The server is connected to the terminal through a network and can be used to provide services (such as data storage services, data analysis services, etc.) for the terminal or the client installed on the terminal. A database can be set up on the server or independently of the server to provide data storage services for the server.

[0079] The above network can include but is not limited to at least one of the following: wired network, wireless network. The above wired network can include but is not limited to at least one of the following: wide area network, metropolitan area network, local area network. The above wireless network can include but is not limited to at least one of the following: WIFI (Wireless Fidelity), Bluetooth. The terminal is not limited to a PC, mobile phone, tablet computer, etc.

[0080] The torque distribution method of the embodiments of this application can be executed by the server, or by the terminal, or jointly by the server and the terminal. Among them, when the terminal executes the torque distribution method of the embodiments of this application, it can also be executed by the client installed on it.

[0081] Taking the torque distribution method in this embodiment executed by the terminal as an example, Figure 1 is a schematic flowchart of a torque distribution method provided for the embodiments of this application, applied to such as Figure 2The shown series - parallel hybrid power system includes the following steps:

[0082] Step S101: Obtain the current battery temperature of the high - voltage battery operating in a low - temperature environment and the driver's required torque.

[0083] As an optional embodiment, like the aforementioned torque distribution method, before the step S101 of obtaining the current battery temperature of the high - voltage battery operating in a low - temperature environment and the driver's required torque, the method further includes:

[0084] In the case where the current ambient temperature is lower than or equal to the lower temperature limit indicated by the battery information of the high - voltage battery, it is determined that the high - voltage battery is operating in a low - temperature environment, and a jump operation is performed to jump to execute obtaining the current battery temperature of the high - voltage battery operating in a low - temperature environment and the driver's required torque.

[0085] For example, the battery type and / or battery brand of the high - voltage battery can be determined, and the corresponding battery information (i.e., the battery information may include but is not limited to: battery type, battery brand, temperature range (i.e., the optimal operating temperature range, for example: - 25°C to 40°C, - 20°C to 45°C, etc.)) can be determined.

[0086] Then, after determining that the vehicle is operating in a low - temperature environment, the current battery temperature of the high - voltage battery and the driver's required torque can be determined; the current battery temperature can be detected by a temperature sensor that detects the temperature of the high - voltage battery, and the driver's required torque can be obtained by acquiring relevant data on the driver's throttle pedal operation.

[0087] According to the above - mentioned technical means, it can be timely and accurately determined whether the high - voltage battery is operating in a low - temperature environment, and then it can enter the low - temperature operation mode in a timely manner, and ensure the continuous operation of the engine and the high - voltage battery in this mode.

[0088] Step S102: Determine the target charge - discharge power of the high - voltage battery at the current battery temperature according to the current battery temperature and the state of charge of the high - voltage battery.

[0089] Generally, each battery has a corresponding state of charge, so the state of charge of the high - voltage battery can be determined in real - time or in advance.

[0090] After determining the current battery temperature and the state of charge of the high - voltage battery, based on the first relationship between the battery temperature and the battery charge - discharge power, and the second relationship between the state of charge and the battery charge - discharge power, the target charge - discharge power of the high - voltage battery at the current battery temperature can be determined. For example, the first relationship is a direct - proportion relationship, and the second relationship is also a direct - proportion relationship.

[0091] The target charging and discharging power can be the charging and discharging power that the high-voltage battery is expected to reach.

[0092] Step S103: Determine the power generation power required by the range extender system according to the target charging and discharging power and the actual power of the drive motor, where the actual power of the drive motor is obtained based on the driver's required torque.

[0093] After determining the driver's required torque, the actual required power of the drive motor can be determined based on this driver's required torque.

[0094] Therefore, the power generation power required by the range extender system can be determined according to the target charging and discharging power and the actual power of the drive motor.

[0095] An internal combustion engine range extender is installed on the vehicle for the range extender system. However, this internal combustion engine does not directly participate in driving the vehicle but only responsible for generating electricity for the vehicle. The electricity generated by it not only directly supplies power to the drive motor but also charges the battery. When the battery is relatively full, the internal combustion engine can stop working, and the battery directly drives the motor to promote the vehicle to move forward.

[0096] Step S104: Determine the target engine speed and target engine torque of the engine, and the target generator speed and target generator torque of the generator according to the power generation power and the efficiency optimal curve of the range extender system.

[0097] The range extender systems of different vehicles have corresponding efficiency optimal curves. The efficiency optimal curve of the range extender system is to take the lowest fuel consumption points on the constant power curve of the range extender system, connect these lowest fuel consumption points, and analyze and determine the best working route according to the final result.

[0098] After determining the power generation power and the efficiency optimal curve of the range extender system of this vehicle, analysis can be carried out based on the power generation power and the efficiency optimal curve to determine the target engine speed and target engine torque of the engine, and the target generator speed and target generator torque of the generator.

[0099] According to the above technical means, since the target charge and discharge power is obtained based on the state of charge of the high-voltage battery and the current battery temperature, the influence on the charge and discharge power of the battery in a low-temperature environment can be effectively considered. Moreover, the power generation power required by the range extender system is determined according to the target charge and discharge power and the actual power of the drive motor, so that the power generation power can also be adjusted following the temperature. Thus, the battery does not need to work near the power limit for a long time, effectively enhancing the safety of the high-voltage battery. In addition, the actual power of the drive motor is obtained based on the driver's demand torque, so that the power generation power can be obtained in response to the driver's demand, improving drivability. Finally, the above technical means also determine the target engine speed and target engine torque of the engine, and the target generator speed and target generator torque of the generator according to the power generation power and the efficiency optimal curve of the range extender system. Thus, even in a low-temperature environment, the torque of the engine can be kept accurate, which can ensure the accuracy of the charging power as an optional embodiment.

[0100] As Figure 3 shown, as an optional embodiment, like the aforementioned torque distribution method, step S102 determines the target charge and discharge power of the high-voltage battery according to the current battery temperature and the state of charge of the high-voltage battery, including the following steps:

[0101] Step S201, obtain the calibration information of the high-voltage battery, where the calibration information is used to indicate the corresponding relationship between the battery temperature, the battery charge amount, and the battery charge and discharge power;

[0102] Step S202, determine the target charge and discharge power according to the calibration information, the current battery temperature, and the state of charge of the high-voltage battery.

[0103] Optionally, the calibration information of the high-voltage battery can be obtained by analyzing other batteries of the same type as the high-voltage battery to determine the corresponding relationship between the battery temperature, the battery charge amount, and the battery charge and discharge power of the high-voltage battery, and this corresponding relationship can be characterized by means of graphs, tables, functions, etc.

[0104] After determining the calibration information, the current battery temperature and the battery charge amount of the high-voltage battery can be matched in the calibration information, and finally the target charge and discharge power can be obtained.

[0105] According to the above technical means, by obtaining the calibration information of the high-voltage battery and then determining the target charge and discharge power, the efficiency of determining the target charge and discharge power can be effectively improved.

[0106] As Figure 4As shown, as an optional embodiment, as in the aforementioned torque distribution method, the step S202 determines the target charge and discharge power according to the calibration information, the current battery temperature and the battery charge of the high-voltage battery, including the following steps:

[0107] Step S301, matching the original target charge and discharge power in the calibration information according to the current battery temperature and the battery charge of the high-voltage battery;

[0108] Step S302, determining the actual power of the high-voltage battery according to the actual voltage and actual current of the high-voltage battery;

[0109] Step S303, performing a first closed-loop control on the original target charge and discharge power according to the power deviation between the actual power and the original target charge and discharge power, obtaining the target charge and discharge power, and determining the target voltage and target current of the high-voltage battery;

[0110] Step S304: filtering the target voltage and the target current.

[0111] Optionally, the battery can be charged according to the SOC HV and the current battery temperature T Batt Determine the original target charge and discharge power P of the battery Tar ; According to the actual voltage U of the high voltage battery HV and the actual current I HV Calculate the actual power of the high voltage battery; P HV =U HV ×I HV , and perform closed-loop control on the target charge and discharge power of the battery based on this power; filter the target charge and discharge power of the battery calculated by the above method (that is, filter the target voltage and target current) to ensure the stability of the power system.

[0112] like Figure 5 As shown, as an optional embodiment, as the aforementioned torque distribution method, the step S303 performs a first closed-loop control on the original target charge and discharge power according to the power deviation between the actual power and the original target charge and discharge power to obtain the target charge and discharge power, including the following steps:

[0113] Step S401, when the power deviation indicates that the original target charge and discharge power is less than the actual power, the original target charge and discharge power is increased to obtain the target charge and discharge power;

[0114] Step S402, when the power deviation indicates that the original target charge and discharge power is equal to the actual power, the original target charge and discharge power is used as the target charge and discharge power;

[0115] Step S403: When the original target charge-discharge power indicated by the power deviation is greater than the actual power, reduce the original target charge-discharge power to obtain the target charge-discharge power.

[0116] According to the technical means described in steps S401 - S403, the original target charge-discharge power can be adjusted in different situations to obtain the target charge-discharge power that is closest to the actual power.

[0117] According to the above technical means, through the power deviation between the actual power and the original target charge-discharge power, the first closed-loop control of the original target charge-discharge power is carried out to obtain the target charge-discharge power, which can effectively ensure the stability and reliability of the charge and discharge of the high-voltage battery. Moreover, filtering the target voltage and target current can, as an optional embodiment, ensure the stability of the power system powered by the high-voltage battery.

[0118] As Figure 6 shown, as an optional embodiment, like the aforementioned torque distribution method, step S104 determines the engine target speed and engine target torque of the engine, and the generator target speed and generator target torque of the generator according to the power generation power and the efficiency optimal curve of the range extender system, including the following steps:

[0119] Step S501: Determine the original engine target speed and original engine target torque of the engine, and the original generator target speed and original generator target torque of the generator according to the power generation power and the efficiency optimal curve of the range extender system.

[0120] That is to say, what is determined according to the power generation power and the efficiency optimal curve of the range extender system may need to be further adjusted: the original engine target speed and original engine target torque of the engine, and the original generator target speed and original generator target torque of the generator.

[0121] Step S502: When the engine operates according to the power generation power, through the deviation between the actual engine speed and the original engine target speed of the engine, perform the second closed-loop control on the original engine target torque to obtain the engine target torque.

[0122] By this method, the influence of obtaining system fluctuation information, energy transfer efficiency, and system error information on the power generation power can be solved; the system fluctuation information can be, for example, the fluctuation information caused by external vibrations and turning on and off the air conditioner.

[0123] The energy transfer efficiency can be used to indicate the proportion of losses that occur during the energy transfer process.

[0124] The system error information can include but is not limited to: errors existing during the energy transfer process or during the power monitoring process.

[0125] That is to say, by the deviation between the actual engine speed and the original engine target speed of the engine, a second closed-loop control is performed on the original engine target torque to obtain the engine target torque. In the case where there are system fluctuation information, energy transfer efficiency, and system error information, it is still possible to obtain the requirements for the engine to operate according to the power generation power.

[0126] Step S503: Based on the engine target torque, obtain the engine target speed, the generator target speed, and the generator target torque.

[0127] After obtaining the system fluctuation information, energy transfer efficiency, and system error information, the closed-loop control of the target torque of the engine can be performed according to the actual engine speed of the engine, further ensuring the safety of the high-voltage battery and the stability of the system.

[0128] The original engine target speed can be the target torque of the engine determined before the second closed-loop control of the original engine target torque.

[0129] After determining the engine target torque, since the engine torque is respectively related to the engine speed, the generator speed, and the generator torque, therefore, the engine target speed, the generator target speed, and the generator target torque can be determined based on the engine target torque.

[0130] According to the above technical means, combined with the system fluctuation information, energy transfer efficiency, and system error information, the accuracy of the engine torque can be effectively improved, and further, the charging power deviation caused by inaccurate engine torque can be avoided.

[0131] Such as Figure 7 As shown, as an optional embodiment, like the aforementioned torque distribution method, in the case where the engine operates according to the power generation power, step S502 performs a second closed-loop control on the original engine target torque through the deviation between the actual engine speed and the original engine target speed of the engine to obtain the engine target torque, including the following steps:

[0132] Step S601: When the original engine target speed is less than the actual engine speed, increase the original engine target torque to obtain the engine target torque;

[0133] Step S602: When the original engine target speed is equal to the actual engine speed, use the original engine target torque as the engine target torque;

[0134] Step S603: When the original engine target speed is greater than the actual engine speed, reduce the original engine target torque to obtain the engine target torque.

[0135] Further, the target engine speed can also be determined according to the above method, that is, obtained by adjusting the actual engine speed according to the original target engine speed.

[0136] When the latest target engine speed is the same as the actual engine speed or within a preset error, the target engine speed is no longer adjusted. Otherwise, the engine target torque is used as the original target engine torque, and the target engine speed is used as the original target engine speed, and the adjustment is performed again in the manner described in steps S601 to S603 above.

[0137] In this embodiment, the actual engine speed is proportional to the actual generator speed.

[0138] According to the above technical means, the original target engine torque can be adjusted under different conditions to obtain the engine target torque that can satisfy the generator to operate at the target generator speed when the generator operates at the target power generation power.

[0139] As Figure 8 shown, as an optional embodiment, like the torque distribution method described above, the step S103 of determining the power generation power required by the range extender system according to the target charge-discharge power and the actual power of the drive motor includes the following steps:

[0140] Step S701, determine the power consumption of high-voltage accessories in the vehicle where the high-voltage battery is located;

[0141] The power consumption of high-voltage accessories can include but is not limited to: the power consumption of the air conditioner, the power consumption of audio-visual equipment, etc. Optionally, it can be determined in real time based on the operating state of the high-voltage accessories.

[0142] Step S702, determine the actual power of the drive motor in the vehicle.

[0143] As an optional embodiment, like the torque distribution method described above, determining the actual power of the drive motor in the vehicle includes: assigning the driver's demand torque to the drive torque demand of the drive motor; sending the drive torque demand to the dual-motor controller; controlling the drive motor through the dual-motor controller, and determining the actual power of the drive motor. According to the above technical means, the dual-motor controller can be controlled according to the driver's demand torque, so as to respond to the driver's demand in a timely manner.

[0144] Step S703, based on the sum of the target charge-discharge power, the power consumption of high-voltage accessories, and the actual power, determine the power generation power.

[0145] After determining the target charging and discharging power, the power consumption of high-voltage accessories, and the actual power of the drive motor, the sum of the above-mentioned target charging and discharging power, the power consumption of high-voltage accessories, and the actual power can be determined as the required power generation power.

[0146] According to the above technical means, by determining the power generation power based on the sum of the target charging and discharging power, the power consumption of high-voltage accessories, and the actual power, it can be used as an optional embodiment to ensure the safety of the high-voltage battery and the stability of the system.

[0147] Such as Figure 9 And Figure 10 As shown, an application example applying any of the foregoing embodiments is provided:

[0148] S1. Determine whether to enter the low-temperature battery protection mode according to conditions such as temperature and battery capacity (that is, determine whether the current ambient temperature is lower than or equal to the temperature lower limit indicated by the battery information of the high-voltage battery), and ensure the continuous operation of the engine in this mode;

[0149] S2. Determine the drive torque demand Tq Drv of the drive motor according to the driver's demand torque Tq Mot , and send the drive torque demand Tq Mot to the dual-motor controller as the target torque;

[0150] S3. Determine the target charging and discharging power P HV of the battery according to the state of charge SOC Batt of the battery and the battery temperature T Tar ;

[0151] S4. Calculate the actual power P HV of the high-voltage battery according to the actual voltage U HV and the actual current I HV of the high-voltage battery = U HV ×I HV , and perform the first closed-loop control on the target charging and discharging power of the battery according to this power;

[0152] S5. Filter the target charging and discharging power of the battery calculated by the above method to ensure the stability of the power system;

[0153] S6. Calculate the required power generation power P Tar of the range extender system according to the target charging and discharging power P NonTrac of the battery, the power consumption P Mot of the high-voltage accessories, and the actual power P Eng of the drive motor = P Tar +P NonTrac +P Mot ;

[0154] S7. According to the power generation power P of the range extender system Eng , determine the target speeds n Eng and n Ger of the engine and the generator and the target torque Tq Eng and Tq Ger according to the optimal efficiency curve of the range extender system;

[0155] S8. Considering various factors such as system fluctuations, energy transfer efficiency, and system errors, perform closed-loop control on the target torque of the engine according to the actual speed of the engine to further ensure the safety of the high-voltage battery and the stability of the system.

[0156] It should be noted that for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0157] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as ROM (Read-Only Memory), RAM (Random Access Memory), magnetic disk, optical disk), and includes several instructions to enable a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of this application.

[0158] According to another aspect of the embodiments of this application, there is also provided a torque distribution device for implementing the above torque distribution method. Figure 11 is a structural block diagram of an optional torque distribution device according to the embodiments of this application, as Figure 11 shown. The device may include:

[0159] An acquisition module 1, configured to acquire the current battery temperature of the high-voltage battery operating in a low-temperature environment and the driver demand torque;

[0160] The first determination module 2 is configured to determine the target charge and discharge power of the high-voltage battery at the current battery temperature according to the current battery temperature and the state of charge of the high-voltage battery.

[0161] The second determination module 3 is configured to determine the power generation power required by the range extender system according to the target charge and discharge power of the battery and the actual power of the drive motor, where the actual power of the drive motor is obtained based on the driver's required torque.

[0162] The third determination module 4 is configured to determine the original target speed and original target torque of the engine and the original target speed and original target torque of the generator according to the power generation power and the efficiency optimal curve of the range extender system.

[0163] It should be noted that the acquisition module 1 in this embodiment can be used to execute the above step S101, the first determination module 2 in this embodiment can be used to execute the above step S102, the second determination module 3 in this embodiment can be used to execute the above step S103, and the third determination module 4 in this embodiment can be used to execute the above step S104.

[0164] The device in this embodiment, in addition to including the above modules, may further include a module for executing any method in the embodiment of any of the foregoing torque distribution methods.

[0165] It should be noted here that the examples and application scenarios implemented by the above modules and the corresponding steps are the same, but are not limited to the content disclosed in the above embodiments. It should be noted that the above modules, as part of the device, can run in the hardware environment for implementing the method as shown in Figure 1 and can be implemented by software or hardware, where the hardware environment includes a network environment.

[0166] According to another aspect of the embodiments of the present application, there is also provided an electronic device for implementing the above torque distribution method, and the electronic device may be a server, a terminal, or a combination thereof.

[0167] According to another embodiment of the present application, there is also provided an electronic device, including: as shown in Figure 12 the electronic device may include: a processor 1501, a communication interface 1502, a memory 1503, and a communication bus 1504, where the processor 1501, the communication interface 1502, and the memory 1503 communicate with each other through the communication bus 1504.

[0168] The memory 1503 is used to store a computer program;

[0169] When the processor 1501 is used to execute the program stored in the memory 1503, the following steps are implemented:

[0170] Step S101, obtain the current battery temperature of the high-voltage battery operating in a low-temperature environment and the driver's required torque.

[0171] Step S102, determine the target charge-discharge power of the high-voltage battery at the current battery temperature according to the current battery temperature and the state of charge of the high-voltage battery.

[0172] Step S103, determine the required power generation power of the range extender system according to the target charge-discharge power and the actual power of the drive motor, where the actual power of the drive motor is obtained based on the driver's required torque.

[0173] Step S104, determine the original target engine speed and the original target engine torque of the engine, the original target generator speed and the original target generator torque of the generator according to the power generation power and the efficiency optimal curve of the range extender system.

[0174] Optionally, in this embodiment, the above communication bus may be a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The communication bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of convenience of representation, only a thick line is used in the figure, but it does not mean that there is only one bus or one type of bus. The communication interface is used for communication between the above electronic device and other devices.

[0175] The memory may include a random access memory (RAM), and may also include a non-volatile memory (NVM), such as at least one disk memory. Optionally, the memory may also be at least one storage device located far from the aforementioned processor.

[0176] The above processor may be a general-purpose processor, which may include but is not limited to: a CPU (Central Processing Unit), an NP (Network Processor), etc.; it may also be a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0177] The embodiments of the present application further provide a computer-readable storage medium. The storage medium includes a stored program, and when the program runs, it executes the method steps of the above method embodiments.

[0178] Optionally, in this embodiment, the above storage medium may include, but is not limited to, various media that can store program codes, such as USB flash drives, ROMs, RAMs, mobile hard disks, magnetic disks, or optical discs.

[0179] The serial numbers of the above embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0180] If the integrated unit in the above embodiments is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in the above computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in the storage medium and includes several instructions for causing one or more computer devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.

[0181] In the above embodiments of the present application, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0182] In the several embodiments provided by the present application, it should be understood that the disclosed client can be implemented in other ways. Among them, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. 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 displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the units or modules can be in electrical or other forms.

[0183] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution provided in this embodiment.

[0184] In addition, each functional unit in various embodiments of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0185] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A torque distribution method, characterized in that, Including: Obtain the current battery temperature of a high-voltage battery operating in a low-temperature environment and the driver's required torque; Determine the target charge-discharge power of the high-voltage battery at the current battery temperature according to the current battery temperature and the state of charge of the high-voltage battery; Determine the required power generation power of the range extender system according to the target charge-discharge power and the actual power of the drive motor, wherein the actual power of the drive motor is obtained based on the driver's required torque; Determine the target engine speed and target engine torque of the engine, and the target generator speed and target generator torque of the generator according to the power generation power and the efficiency optimal curve of the range extender system.

2. The torque distribution method according to claim 1, wherein The determining the target charge-discharge power of the high-voltage battery according to the current battery temperature and the state of charge of the high-voltage battery includes: Obtain the calibration information of the high-voltage battery, wherein the calibration information is used to indicate the corresponding relationship between the battery temperature, the battery charge amount and the battery charge-discharge power; Determine the target charge-discharge power according to the calibration information, the current battery temperature and the state of charge of the high-voltage battery.

3. The torque distribution method according to claim 2, wherein The determining the target charge-discharge power according to the calibration information, the current battery temperature and the state of charge of the high-voltage battery includes: Match the original target charge-discharge power in the calibration information according to the current battery temperature and the state of charge of the high-voltage battery; Determine the actual power of the high-voltage battery according to the actual voltage and actual current of the high-voltage battery; perform a first closed-loop control on the original target charge-discharge power through the power deviation between the actual power and the original target charge-discharge power to obtain the target charge-discharge power, and determine the target voltage and target current of the high-voltage battery; Perform filtering processing on the target voltage and target current.

4. The torque distribution method according to claim 3, characterized in that, The performing a first closed-loop control on the original target charge-discharge power through the power deviation between the actual power and the original target charge-discharge power to obtain the target charge-discharge power includes: In the case where the power deviation indicates that the original target charge-discharge power is less than the actual power, increase the original target charge-discharge power to obtain the target charge-discharge power; In the case where the power deviation indicates that the original target charge-discharge power is equal to the actual power, use the original target charge-discharge power as the target charge-discharge power; In the case where the power deviation indicates that the original target charge-discharge power is greater than the actual power, decrease the original target charge-discharge power to obtain the target charge-discharge power.

5. The torque distribution method according to claim 1, characterized in that The determining the target engine speed and target engine torque of the engine, and the target generator speed and target generator torque of the generator according to the power generation power and the efficiency optimal curve of the range extender system includes: Determine the original target engine speed and original target engine torque of the engine, and the original target generator speed and original target generator torque of the generator according to the power generation power and the efficiency optimal curve of the range extender system; When the engine operates at the power generation power, a second closed-loop control is performed on the original target torque of the engine according to the deviation between the actual engine speed and the original target engine speed of the engine, and the target torque of the engine is obtained. Based on the target torque of the engine, the target engine speed, the target generator speed, and the target generator torque are obtained.

6. The torque distribution method according to claim 5, characterized in that, When the engine operates at the power generation power, a second closed-loop control is performed on the original target torque of the engine according to the deviation between the actual engine speed and the original target engine speed of the engine, and the target torque of the engine is obtained, including: When the original target engine speed is less than the actual engine speed, the original target engine speed is increased to obtain the target torque of the engine. When the original target engine speed is equal to the actual engine speed, the original target engine speed is used as the target torque of the engine. When the original target engine speed is greater than the actual engine speed, the original target engine speed is decreased to obtain the target torque of the engine.

7. The torque distribution method according to claim 1, characterized in that Determining the power generation power required by the range extender system according to the target charge-discharge power and the actual power of the drive motor includes: Determining the power consumption of the high-voltage accessories of the vehicle where the high-voltage battery is located. Determining the actual power of the drive motor in the vehicle. Based on the sum of the target charge-discharge power, the power consumption of the high-voltage accessories, and the actual power, the power generation power is determined.

8. The torque distribution method according to claim 1, characterized in that Before obtaining the current battery temperature of the high-voltage battery operating in a low-temperature environment and the driver's demand torque, the method further includes: When the current ambient temperature is lower than or equal to the lower temperature limit indicated by the battery information of the high-voltage battery, it is determined that the high-voltage battery operates in the low-temperature environment, and a jump operation is performed to execute the step of obtaining the current battery temperature of the high-voltage battery operating in the low-temperature environment and the driver's demand torque.

9. The torque distribution method according to claim 7, characterized in that, Determining the actual power of the drive motor in the vehicle includes: Assigning the driver's demand torque to the drive torque demand of the drive motor. Sending the drive torque demand to the dual-motor controller. Controlling the drive motor through the dual-motor controller and determining the actual power of the drive motor.

10. A torque distribution device, characterized in that, Including: An acquisition module for acquiring the current battery temperature of the high-voltage battery operating in a low-temperature environment and the driver's demand torque. A first determination module for determining the target charge-discharge power of the high-voltage battery at the current battery temperature according to the current battery temperature and the state of charge of the high-voltage battery. A second determination module for determining the power generation power required by the range extender system according to the target charge-discharge power and the actual power of the drive motor, where the actual power of the drive motor is obtained based on the driver's demand torque. A third determination module, configured to determine an original target engine speed and an original target engine torque of the engine, and an original target generator speed and an original target generator torque of the generator according to the generated power and the efficiency optimal curve of the range extender system.

11. An electronic device, comprising a processor, a communication interface, a memory, and a communication bus, wherein, The processor, the communication interface and the memory complete communication with each other through the communication bus, characterized in that The memory is used for storing a computer program; The processor is configured to execute the method steps described in any one of claims 1 to 9 by running the computer program stored on the memory.

12. A computer-readable storage medium, characterized in that, A computer program is stored in the storage medium, wherein the computer program is configured to execute the method steps described in any one of claims 1 to 9 when running.

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