Torque distribution control method and system and vehicle

Abstract

The invention relates to the technical field of automobile control, in particular to a torque distribution control method and system and a vehicle. Comprising the steps that according to a target economic torque line and the charging and discharging efficiency of a battery pack, the adjusted specific fuel consumption of an engine at each rotating speed is calculated to obtain one-to-one corresponding adjusting torques; an upper torque line and a lower torque line which are relatively economical are obtained based on comparison of the adjusting torque and the target torque, and different economical torque lines are made according to the remaining electric quantity state of the battery pack, so that the discharging probability of the battery pack is improved while economical operation of the engine under high electric quantity is achieved. The charging probability of the battery pack is improved while the engine operates economically under the low electric quantity, and the effect that electric balance is maintained more easily while the engine operates economically is achieved. And the residual electric quantity of the battery pack is always kept in a relatively balanced range while the working economic area of the engine is ensured, so that a non-economic state of large-load power generation under extremely low electric quantity is avoided.

Description

Technical Field

[0001] The present invention relates to the field of automobile control technology, and in particular to a torque distribution control method, system and vehicle. Background Art

[0002] The mainstream torque distribution strategy of existing plug-in hybrid vehicles in parallel state is: The optimal economic torque is determined based on the current engine speed, so that the engine can work on the optimal economic torque line first. Specifically, the drive motor is used to adjust the battery pack to charge and discharge so that the engine works on the optimal economic torque line. However, when the motor or battery works at its maximum capacity and still cannot ensure that the engine works on the optimal economic torque line, the engine needs to work again to a higher torque point until the driving demand is met.

[0003] Although this mainstream torque distribution strategy can ensure that the vehicle model works on the optimal economic torque line as much as possible, it is prone to over-discharge caused by low-power and high-load driving and over-charging caused by high-power and low-load driving, making it difficult to achieve electrical balance. At the same time, it is also more likely to enter the non-economic zone of extremely low-power and high-load operation, which can easily increase the fuel consumption of the entire vehicle. Summary of the invention

[0004] The present invention aims to at least improve one of the technical problems existing in the prior art. To this end, the present invention proposes a torque distribution control method, system and vehicle.

[0005] A torque distribution control method according to an embodiment of the first aspect of the present invention comprises: S100, obtaining the battery pack charge and discharge efficiency η of the target vehicle battery and the engine's universal characteristic diagram; S200, extracting the target torque with the lowest specific fuel consumption at each engine speed according to the universal characteristic diagram to obtain a target economic torque line of the engine; S300, according to the target economic torque line and the battery pack charge and discharge efficiency, calculates the adjusted specific fuel consumption at each engine speed to obtain a one-to-one corresponding adjusted torque; S400, comparing the adjusted torque with the target torque to obtain a first torque data set and a second torque data set; S500, drawing a first economic torque line according to the first torque data set, and drawing a second economic torque line according to the second torque data set; S600, obtaining a current state of charge signal of the battery pack, and determining a power state of the battery pack according to the state of charge signal; S700: Execute an engine control strategy and output engine torque according to the power state of the battery pack. According to the torque distribution control method of the embodiment of the present invention, two relatively economic torque lines are preset on the upper and lower sides based on the optimal economic line of the engine, and different economic torque lines are used according to the remaining power state of the battery pack, so as to achieve economic operation of the engine under high power while increasing the probability of battery pack discharge, and economic operation of the engine under low power while increasing the probability of battery pack charging, so as to achieve the effect of making the engine run economically while making it easier to maintain electrical balance. While ensuring that the engine works in the economic area, the SOC is always kept in a relatively balanced range to avoid entering the non-economic state of high-load power generation under extremely low power.

[0006] In a possible implementation manner of the first aspect, S200 includes: According to the universal characteristic diagram, the engine speed range and the specific fuel consumption of the engine speed are obtained, and the speed step length is set; Determine a speed point within the engine speed range according to each speed step; The target torque with the lowest specific fuel consumption at each speed point is extracted according to the universal characteristic diagram, and each of the target torques is connected in sequence to obtain the target economic torque line of the engine (that is, the optimal economic torque line of the engine). This is beneficial for the engine torque output to be on the optimal economic torque line when the battery pack is at medium power without external charging, thereby reducing the entry into a non-economic state of extremely low power, and also reducing overcharging into an extremely high power state.

[0007] In a possible implementation manner of the first aspect, S300 includes: Assuming a certain speed x on the target economic torque line, extract the engine specific fuel consumption BSFC at the speed x; Calculate the adjusted specific fuel consumption BSFC at speed x x : BSFC x =BSFC÷η battery , Where BSFC represents the engine specific fuel consumption at speed x in the target economic torque line; According to the adjusted specific fuel consumption BSFC x The adjusted torque corresponding to the speed x is obtained by querying, so as to calculate multiple economic torque lines for different vehicles.

[0008] In a possible implementation of the first aspect, S400 specifically comprises: comparing the adjusted torque at each speed with the target torque, and if the adjusted torque is greater than the target torque, assigning the adjusted torque to the first torque data set; if the adjusted torque is less than the target torque, assigning the adjusted torque to the second torque data set, so as to facilitate the collection and arrangement of the various torque high points and torque low points of the first economic torque line and the second economic torque line.

[0009] In a possible implementation of the first aspect, in S600, the charge state of the battery pack is defined as five charge level states according to the charge state signal M, wherein: If M≥25%, the battery pack is in the first power state; If 25%>M≥21%, the battery pack is in the second power state; If 21%>SOC≥19%, the battery pack is in the third power state; If 19%>SOC≥15%, the battery pack is in the fourth power state; If SOC is less than 15%, the battery pack is in the fifth state of charge.

[0010] The engine control strategy includes: If the battery pack is in the first power state, controlling the engine to operate in a pure electric mode; If the battery pack is in the second power state, the second economic torque line is used as the engine input data, so that the engine runs on the second economic torque line which is at a lower point than the target economic torque line. The output power of the engine is low, the battery pack has a greater chance of discharging, and the battery pack gradually approaches the medium power state. If the battery pack is in the third power state, the target economic torque line is used as the engine input data to make the engine run on the target economic torque line. In the case of no external charging, the vehicle should be mainly in the medium power state, so the engine needs to work on the target economic torque line in this power state; If the battery pack is in the fourth power state, the first economic torque line is used as the engine input data, so that the engine runs on the first economic torque line which is at a higher point than the target economic torque line. The engine output power is higher, the battery pack has a greater chance of charging, and the battery pack gradually approaches the medium power state. If the battery pack is in the fifth power state, the engine is controlled to operate in full load mode, allowing the engine to charge the battery pack according to the maximum load output capacity. At this time, in order to maintain the power of the battery pack, the engine will deviate from the economy line and have poor fuel consumption.

[0011] The present invention can make it easier for the battery pack to maintain three power states: high, medium and low. The engine in these three power states can run on the economy line, reducing the non-economic state of extremely low power, and also reducing overcharging to enter the extremely high power state. Compared with the existing technology, the fuel consumption of the whole vehicle is improved by 3%.

[0012] In a possible implementation manner of the first aspect, S200 further includes: Obtain the target vehicle's battery pack charging and discharging efficiency, basic engine parameters, current driving mode, and multiple driving parameters under the current driving mode. The basic engine parameters include displacement, number of cylinders, compression ratio, maximum power, and maximum torque. The driving parameters include vehicle speed, engine speed, and fuel consumption.

[0013] An engine simulation model is constructed based on basic engine parameters, the current driving mode, and various driving parameters under the current driving mode to output an engine universal characteristic diagram.

[0014] A torque distribution control system according to an embodiment of the second aspect of the present invention comprises: Acquisition module, used to obtain the battery pack charging and discharging efficiency η of the target vehicle battery and the engine's universal characteristic diagram; An extraction module, configured to extract the target torque with the lowest specific fuel consumption at each engine speed according to the universal characteristic diagram to obtain a target economic torque line of the engine; A calculation module, used for calculating the adjusted specific fuel consumption at each engine speed to obtain a one-to-one corresponding adjusted torque according to the target economic torque line and the battery pack charge and discharge efficiency; A comparison module, configured to compare the adjusted torque with the target torque to obtain a first torque data set and a second torque data set; A generating module, configured to draw a first economic torque line according to the first torque data set, and to draw a second economic torque line according to the second torque data set; A judgment module, used to obtain a current state of charge signal of the battery pack, and judge the power state of the battery pack according to the state of charge signal; The execution module executes the engine control strategy and outputs the engine torque according to the power state of the battery pack.

[0015] According to a third aspect of an embodiment of the present invention, a vehicle is provided with a torque distribution control system, and the system is used to execute the torque distribution control method as described above.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a flow chart of a torque distribution control method according to an embodiment of the present invention; Figure 2 is a schematic diagram of an engine economic torque line according to a torque distribution control method according to an embodiment of the present invention; Figure 3 Schematic diagram of a torque distribution control system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0022] The terms "first", "second", "third", etc. in the specification and claims of the present application and the drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a series of steps or units are included, or optionally, steps or units not listed are included, or optionally, other steps or units inherent to these processes, methods, products or devices are included.

[0023] Only the part relevant to the present application is shown in the accompanying drawings, but not all of the content. Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processing or methods depicted as flow charts. Although the flow chart describes each operation (or step) as a sequential process, many of the operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of each operation can be rearranged. When its operation is completed, the process can be terminated, but it can also have additional steps not included in the accompanying drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0024] The terms "component", "module", "system", "unit", etc. used in this specification are used to represent computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a unit can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and / or distributed between two or more computers. In addition, these units can be executed from various computer-readable media having various data structures stored thereon. Units can communicate through local and / or remote processes, for example, based on signals having one or more data packets (e.g., data from a second unit interacting with another unit in a local system, a distributed system, and / or a network. For example, the Internet interacts with other systems via signals).

[0025] Example 1 See also Figure 1 and Figure 2 As shown, this embodiment provides a preset torque distribution control method, which is particularly suitable for plug-in hybrid electric vehicles, including: S100, obtaining the battery pack charge and discharge efficiency η of the target vehicle battery and the universal characteristic diagram of the engine, where the battery pack charge and discharge efficiency η of the target vehicle battery Provided by battery supplier; S200, extracting the target torque with the lowest specific fuel consumption at each engine speed according to the universal characteristic diagram to obtain the target economic torque line of the engine, specifically: Obtaining the engine speed range and the specific fuel consumption of the engine speed according to the universal characteristic map, and setting the speed step; Determine a speed point within the engine speed range according to each speed step; The target torque with the lowest specific fuel consumption at each speed point is extracted according to the universal characteristic diagram, and each of the target torques is connected in sequence to obtain the target economic torque line of the engine (that is, the optimal economic torque line of the engine). This is beneficial for the engine torque to be output on the optimal economic torque line when the battery pack is at medium power without external charging, thereby reducing the engine from entering a non-economic state of extremely low power, and also reducing the battery pack from being overcharged and entering an extremely high power state.

[0026] It should be noted that in this embodiment, 500 rpm is used as a step length, wherein the step length can be adjusted according to the accuracy requirements. The step length value given in this embodiment is only used as an example and cannot be used to limit the protection scope of this application. The speed range between the lowest engine speed and the highest engine speed is obtained by using the vehicle central control system, and the speed range is rounded according to the speed step length of 500 rpm to obtain multiple speed points x 1 , x 2。。。 x n, n is a positive integer, extract each speed point x on the engine universal characteristic map 1 , x 2。。。 x n The target torque T with the lowest specific fuel consumption 1 , T 2。。。 T n , n is a positive integer, each of the target torques T 1 , T 2。。。 T n The target economic torque line of the engine is obtained by connecting them in sequence.

[0027] S300, according to the target economic torque line and the battery pack charge and discharge efficiency, calculates the adjusted specific fuel consumption at each engine speed to obtain a one-to-one corresponding adjusted torque; Take a certain speed x on the target economic torque line as an example, extract the engine specific fuel consumption BSFC at the speed x; Calculate the adjusted specific fuel consumption BSFC at speed x x : BSFC x =BSFC÷η battery , Where BSFC represents the engine specific fuel consumption at speed x in the target economic torque line, in g / kwh; According to the adjusted specific fuel consumption BSFC x The adjusted torque corresponding to the speed x is obtained by querying, so as to calculate multiple economic torque lines for different vehicles.

[0028] S400, comparing the adjusted torque with the target torque to obtain a first torque data set and a second torque data set, wherein specifically: The adjusted torque at each speed is compared with the target torque. If the adjusted torque is greater than the target torque, the adjusted torque is assigned to the first torque data set; if the adjusted torque is less than the target torque, the adjusted torque is assigned to the second torque data set, so as to facilitate the collection and arrangement of the various torque high points and torque low points of the first economic torque line and the second economic torque line.

[0029] S500, drawing a first economic torque line according to the first torque data set, and drawing a second economic torque line according to the second torque data set; In this embodiment, according to the speed and the adjusted specific fuel consumption BSFC x Two torque points can be found on the universal characteristic map, where the point above the target torque is taken as the point on the first economic torque line and is included in the first torque data set T h , the points below the target torque are taken as points on the second economic torque line and are included in the second torque data set T l. The first torque data set T is sorted in order of speed. h Connect the torque points in the first torque data set T to obtain the first economic torque line, which corresponds to the economic torque high line of the engine; and divide the second torque data set T into the order of speed. l By connecting each torque point within the engine, a second economic torque line is obtained, which corresponds to the engine's economic torque low line, that is, three economic torque lines are obtained.

[0030] It should be noted that the first economic torque line and the second economic torque line can also be adjusted according to the development vehicle model. Generally, for vehicles with greater driving resistance, the torque on the first economic torque line and the second economic torque line needs to be increased accordingly, otherwise the torque on the first economic torque line and the second economic torque line needs to be reduced.

[0031] S600, obtaining a current state of charge signal of the battery pack, and determining the state of charge of the battery pack according to the state of charge signal, wherein the state of charge of the battery pack is defined as five power level states according to the state of charge signal M, including the following contents: If M≥25%, the battery pack is in the first power state, corresponding to the extremely high power state; If 25%>M≥21%, the battery pack is in the second power state, corresponding to the high power state; If 21%>SOC≥19%, the battery pack is in the third power state, corresponding to the medium power state; If 19%>SOC≥15%, the battery pack is in the fourth power state, corresponding to the low power state; If SOC is less than 15%, the battery pack is in the fifth power state, which corresponds to extremely low power.

[0032] S700: Execute an engine control strategy to output engine torque according to the power state of the battery pack, wherein the engine control strategy includes: If the battery pack is in the first power state, controlling the engine to operate in a pure electric mode; If the battery pack is in the second power state, the second economic torque line is used as the engine input data, so that the engine runs on the second economic torque line which is at a lower point than the target economic torque line. The output power of the engine is low, the battery pack has a greater chance of discharging, and the battery pack gradually approaches the medium power state. If the battery pack is in the third power state, the target economic torque line is used as the engine input data to make the engine run on the target economic torque line. In the case of no external charging, the vehicle should be mainly in the medium power state, so the engine needs to work on the target economic torque line in this power state; If the battery pack is in the fourth power state, the first economic torque line is used as the engine input data, so that the engine runs on the first economic torque line which is at a higher point than the target economic torque line. The engine output power is higher, the battery pack has a greater chance of charging, and the battery pack gradually approaches the medium power state. If the battery pack is in the fifth power state, the engine is controlled to operate in full load mode, allowing the engine to charge the battery pack according to the maximum load output capacity. At this time, in order to maintain the power of the battery pack, the engine will deviate from the economy line and have poor fuel consumption.

[0033] The present invention allows the battery pack to be more easily maintained in high, medium and low power states, and the engine can run on the economic line in these three power states, reducing the risk of entering a non-economic state of extremely low power, and also reducing overcharging to enter an extremely high power state.

[0034] It should be noted that S200 also includes obtaining the target vehicle's battery pack charging and discharging efficiency, basic engine parameters, current driving mode, and various driving parameters under the current driving mode. The basic engine parameters include displacement, number of cylinders, compression ratio, maximum power, and maximum torque. The driving parameters include vehicle speed, engine speed, and fuel consumption.

[0035] An engine simulation model is constructed based on basic engine parameters, the current driving mode, and various driving parameters under the current driving mode to output an engine universal characteristic diagram.

[0036] According to the torque distribution control method of the embodiment of the present invention, two relatively economic torque lines are preset on the upper and lower sides based on the optimal economic line of the engine, and different economic torque lines are used according to the remaining power state of the battery pack, so as to achieve economic operation of the engine under high power while increasing the probability of battery pack discharge, and economic operation of the engine under low power while increasing the probability of battery pack charging, so as to achieve the effect of making the engine run economically while making it easier to maintain electrical balance. While ensuring that the engine works in the economic area, the SOC is always kept in a relatively balanced range to avoid entering the non-economic state of high-load power generation under extremely low power.

[0037] The vehicle model using the torque distribution control method of this embodiment and the common vehicle model of the prior art were subjected to the working condition energy consumption test. Figure 2 As shown, Figure 2 A in the equation represents the contour line of a certain torque. Figure 2 The B in the formula represents the specific value of the torque. Figure 2 The M line in the figure represents the target economic torque line of this embodiment. Figure 2 The H line in the figure represents the first economic torque line of this embodiment. Figure 2 The L line in represents the second economic torque line of this embodiment. The following test results are obtained: Ordinary vehicles that do not adopt the solution of the present invention are prone to enter an extremely low power, high-power, non-economical state in uphill conditions; and are more likely to enter an extremely high power state in downhill conditions; The test vehicle adopting the solution of the present invention basically maintained three power states: high, medium and low in uphill and downhill conditions, and improved fuel consumption by 3% compared with ordinary vehicles not adopting the solution of the present invention.

[0038] Example 2 See also Figure 3 As shown, this embodiment provides a torque distribution control system, which includes: Acquisition module, used to obtain the battery pack charging and discharging efficiency η of the target vehicle battery and the engine's universal characteristic diagram; An extraction module is used to extract the target torque with the lowest specific fuel consumption at each engine speed according to the universal characteristic diagram to obtain the target economic torque line of the engine, which includes: The engine speed range and the specific fuel consumption of the engine speed are obtained according to the universal characteristic diagram, and the speed step length is set.

[0039] Determine a speed point within the engine speed range according to each speed step; Extracting the target torque with the lowest specific fuel consumption at each speed point according to the universal characteristic diagram, and connecting each of the target torques in sequence to obtain the target economic torque line of the engine (that is, the optimal economic torque line of the engine), which is beneficial for the engine torque output to be on the optimal economic torque line when the battery pack is at a medium power level without external charging, thereby reducing the engine from entering a non-economic state of extremely low power, and also reducing the battery pack from being overcharged and entering an extremely high power state; The calculation module is used to calculate the adjusted specific fuel consumption at each engine speed according to the target economic torque line and the battery pack charging and discharging efficiency to obtain a one-to-one corresponding adjustment torque, specifically: Assuming a certain speed x on the target economic torque line, extract the engine specific fuel consumption BSFC at the speed x; Calculate the adjusted specific fuel consumption BSFC at speed x x : BSFC x =BSFC÷η battery , Where BSFC represents the engine specific fuel consumption at speed x in the target economic torque line; According to the adjusted specific fuel consumption BSFC x The adjusted torque corresponding to the speed x is obtained by querying, so as to calculate multiple economic torque lines for different vehicles; a comparison module, for comparing the adjusted torque with the target torque to obtain a first torque data set and a second torque data set, specifically comparing the adjusted torque with the target torque at each speed, if the adjusted torque is greater than the target torque, the adjusted torque is assigned to the first torque data set; if the adjusted torque is less than the target torque, the adjusted torque is assigned to the second torque data set, so as to facilitate the collection and arrangement of various torque high points and torque low points of the first economic torque line and the second economic torque line; A generating module, configured to draw a first economic torque line according to the first torque data set, and to draw a second economic torque line according to the second torque data set; The judging module is used to obtain the current state of charge signal of the battery pack and judge the state of charge of the battery pack according to the state of charge signal, including defining the state of charge of the battery pack into five power level states according to the state of charge signal M, including the following contents: If M≥25%, the battery pack is in the first power state, corresponding to the extremely high power state; If 25%>M≥21%, the battery pack is in the second power state, corresponding to the high power state; If 21%>SOC≥19%, the battery pack is in the third power state, corresponding to the medium power state; If 19%>SOC≥15%, the battery pack is in the fourth power state, corresponding to the low power state; If SOC is less than 15%, the battery pack is in the fifth state of charge, corresponding to extremely low power; The execution module executes the engine control strategy and outputs the engine torque according to the power state of the battery pack. The engine control strategy includes: If the battery pack is in the first power state, controlling the engine to operate in a pure electric mode; If the battery pack is in the second power state, the second economic torque line is used as the engine input data, so that the engine runs on the second economic torque line which is at a lower point than the target economic torque line. The output power of the engine is low, the battery pack has a greater chance of discharging, and the battery pack gradually approaches the medium power state. If the battery pack is in the third power state, the target economic torque line is used as the engine input data to make the engine run on the target economic torque line. In the case of no external charging, the vehicle should be mainly in the medium power state, so the engine needs to work on the target economic torque line in this power state; If the battery pack is in the fourth power state, the first economic torque line is used as the engine input data, so that the engine runs on the first economic torque line which is at a higher point than the target economic torque line. The engine output power is higher, the battery pack has a greater chance of charging, and the battery pack gradually approaches the medium power state. If the battery pack is in the fifth power state, the engine is controlled to operate in full load mode, allowing the engine to charge the battery pack according to the maximum load output capacity. At this time, in order to maintain the power of the battery pack, the engine will deviate from the economy line and have poor fuel consumption.

[0040] A torque distribution control system in the embodiment of the present application may be a device, or a component, integrated circuit, or chip in a terminal. The device may be a mobile electronic device or a non-mobile electronic device. Exemplarily, the mobile electronic device may be a mobile phone, a tablet computer, a laptop computer, a PDA, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc., and the non-mobile electronic device may be a server, a network attached storage (NAS), a personal computer (PC), etc., which is not specifically limited in the embodiment of the present application.

[0041] A torque distribution control system in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an iOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0042] A torque distribution control system provided in the embodiment of the present application can achieve Figure 1 The various processes of the method embodiment of a torque distribution control method are implemented, and to avoid repetition, they are not described here.

[0043] According to a torque distribution control system of this embodiment, its beneficial effects are as follows: based on the optimal economy line of the engine, two relatively economic torque lines are preset above and below, and different economic torque lines are used according to the remaining power state of the battery pack, so that the economic operation of the engine under high power is achieved while increasing the probability of battery pack discharge, and the economic operation of the engine under low power is achieved while increasing the probability of battery pack charging, so as to achieve the effect of making the engine run economically while making it easier to maintain electrical balance. While ensuring the economic working area of ​​the engine, the SOC is always kept in a relatively balanced range to avoid entering the non-economic state of high-load power generation under extremely low power.

[0044] Optionally, an embodiment of the present application also provides an electronic device, including a processor, a memory, and a program or instruction stored in the memory and executable on the processor. When the program or instruction is executed by the processor, each process of the above-mentioned torque distribution control method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0045] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned torque distribution control method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0046] The processor is the processor in the electronic device in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0047] Example 3 This embodiment provides a vehicle, wherein the vehicle is equipped with a torque distribution control system, and the system is used to execute the torque distribution control method as described above.

[0048] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the invention.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0050] Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Mentioning "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present embodiment application. The appearance of this phrase in various positions in the specification is not necessarily the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0051] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A torque distribution control method, characterized in that: include: S100, obtaining the battery pack charge and discharge efficiency η of the target vehicle battery and the engine's universal characteristic diagram; S200, extracting the target torque with the lowest specific fuel consumption at each engine speed according to the universal characteristic diagram to obtain a target economic torque line of the engine; S300, according to the target economic torque line and the battery pack charge and discharge efficiency, calculates the adjusted specific fuel consumption at each engine speed to obtain a one-to-one corresponding adjusted torque; S400, comparing the adjusted torque with the target torque to obtain a first torque data set and a second torque data set; S500, drawing a first economic torque line according to the first torque data set, and drawing a second economic torque line according to the second torque data set; S600, obtaining a current state of charge signal of the battery pack, and determining a power state of the battery pack according to the state of charge signal; S700: Execute an engine control strategy and output engine torque according to the power state of the battery pack.

2. The torque distribution control method according to claim 1, characterized in that: S200 includes: Obtain the engine speed range and specific fuel consumption of the engine speed, and set the speed step; Determine a speed point within the engine speed range according to each speed step; The target torque with the lowest specific fuel consumption at each speed point is extracted, and each of the target torques is sequentially connected to obtain the target economic torque line of the engine.

3. The torque distribution control method according to claim 1, characterized in that: S300 includes: Assuming a certain speed x on the target economic torque line, extract the engine specific fuel consumption BSFC at the speed x; Calculate the adjusted specific fuel consumption BSFC at speed x x : BSFC x =BSFC÷η battery , Where BSFC represents the engine specific fuel consumption at speed x in the target economic torque line; According to the adjusted specific fuel consumption BSFC x The adjustment torque corresponding to the speed x is obtained by querying.

4. The torque distribution control method according to claim 1, characterized in that: S400 specifically includes: comparing the adjusted torque at each speed with the target torque, and if the adjusted torque is greater than the target torque, assigning the adjusted torque to a first torque data set; If the adjusted torque is less than the target torque, the adjusted torque is assigned to the second torque data set.

5. The torque distribution control method according to claim 1, characterized in that: In S600, the charge state of the battery pack is defined as five charge level states according to the charge state signal M, wherein: If M≥25%, the battery pack is in the first power state; If 25%>M≥21%, the battery pack is in the second power state; If 21%>SOC≥19%, the battery pack is in the third power state; If 19%>SOC≥15%, the battery pack is in the fourth power state; If SOC is less than 15%, the battery pack is in the fifth state of charge.

6. The torque distribution control method according to claim 1, characterized in that: The engine control strategy includes: If the battery pack is in the first power state, controlling the engine to operate in a pure electric mode; If the battery pack is in the second power state, the second economic torque line is used as the engine input data; If the battery pack is in the third power state, the target economic torque line is called as the engine input data; If the battery pack is in the fourth power state, the first economic torque line is used as the engine input data; If the battery pack is in the fifth state of charge, the engine is controlled to operate in a full load mode.

7. The torque distribution control method according to claim 1, characterized in that: The S200 also includes: Obtain the target vehicle's battery pack charging and discharging efficiency, basic engine parameters, current driving mode, and various driving parameters under the current driving mode; An engine simulation model is constructed based on basic engine parameters, the current driving mode, and various driving parameters under the current driving mode to output an engine universal characteristic diagram.

8. The torque distribution control method according to claim 7, characterized in that: The driving parameters include vehicle speed, engine speed, and fuel consumption.

9. A torque distribution control system, characterized in that: include: Acquisition module, used to obtain the battery pack charging and discharging efficiency η of the target vehicle battery and the engine's universal characteristic diagram; An extraction module, configured to extract the target torque with the lowest specific fuel consumption at each engine speed according to the universal characteristic diagram to obtain a target economic torque line of the engine; A calculation module, used for calculating the adjusted specific fuel consumption at each engine speed to obtain a one-to-one corresponding adjusted torque according to the target economic torque line and the battery pack charge and discharge efficiency; A comparison module, configured to compare the adjusted torque with the target torque to obtain a first torque data set and a second torque data set; A generating module, configured to draw a first economic torque line according to the first torque data set, and to draw a second economic torque line according to the second torque data set; A judgment module, used to obtain a current state of charge signal of the battery pack, and judge the power state of the battery pack according to the state of charge signal; The execution module executes the engine control strategy and outputs the engine torque according to the power state of the battery pack.

10. A vehicle, characterized in that: The vehicle is equipped with a torque distribution control system, and the system is used to execute the torque distribution control method according to any one of claims 1 to 7.

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