Torque distribution control method, system and vehicle

Abstract

The present invention relates to the field of automobile control technology, and in particular to a torque distribution control method, system, and vehicle. The method comprises calculating the adjusted specific fuel consumption at each engine speed based on a target economic torque line and the battery pack charge and discharge efficiency to obtain a one-to-one corresponding adjusted torque; obtaining two relatively economic torque lines based on the comparison of the adjusted torque and the target torque, and taking different economic torque lines according to the remaining battery power state of the battery pack, thereby achieving economic operation of the engine at high power while increasing the probability of battery pack discharge, and economic operation of the engine at low power while increasing the probability of battery pack charging, thereby achieving the effect of making the engine run economically while making it easier to maintain electrical balance. While ensuring the economic operating area of ​​the engine, the remaining battery power of the battery pack is always kept within a relatively balanced range to avoid entering an uneconomical state of high-load power generation at extremely low power.

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 for existing plug-in hybrid vehicles in parallel state is:

[0003] The optimal economic torque is determined based on the current engine speed, prioritizing engine operation within the optimal economic torque line. Specifically, the drive motor regulates the battery pack's charge and discharge to keep the engine operating within the optimal economic torque line. However, if the motor or battery operating at maximum capacity still cannot guarantee the engine operating within the optimal economic torque line, the engine is required to operate again to a higher torque point until the driving demand is met.

[0004] Although this mainstream torque distribution strategy can ensure that the vehicle model operates on the optimal economic torque line as much as possible, it is prone to over-discharge caused by low battery and high load driving and overcharging caused by high battery 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 battery and high load operation, which can easily increase the fuel consumption of the entire vehicle. Summary of the Invention

[0005] The present invention aims to at least improve one of the technical problems existing in the prior art. To this end, the present invention provides a torque distribution control method, system and vehicle.

[0006] A torque distribution control method according to an embodiment of the first aspect of the present invention includes:

[0007] S100, obtaining the target vehicle's battery pack charge and discharge efficiency η battery and the engine's universal characteristic diagram;

[0008] S200, extracting the target torque with the lowest specific fuel consumption at each engine speed based on the universal characteristic map to obtain a target economic torque line of the engine;

[0009] S300: Calculate the adjusted specific fuel consumption at each engine speed based on the target economic torque line and the battery pack charge and discharge efficiency to obtain a corresponding adjusted torque;

[0010] S400, comparing the adjusted torque with the target torque to obtain a first torque data set and a second torque data set;

[0011] 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;

[0012] S600, obtaining a current state of charge signal of the battery pack, and determining a state of charge of the battery pack according to the state of charge signal;

[0013] S700: Execute an engine control strategy and output engine torque according to the state of charge of the battery pack.

[0014] The torque distribution control method according to an embodiment of the present invention adds two preset relatively economical torque lines above and below the engine's optimal economic line. These lines are used according to the remaining battery charge. This allows the engine to operate economically at high charge levels while increasing the probability of battery discharge, and to operate economically at low charge levels while increasing the probability of battery charge. This achieves the effect of maintaining economical engine operation while facilitating battery balance. While ensuring the engine operates in an economical range, the SOC remains within a relatively balanced range, avoiding the uneconomical state of heavy load generation at extremely low charge levels.

[0015] In a possible implementation of the first aspect, S200 includes:

[0016] 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;

[0017] Determine a speed point within the engine speed range according to each speed step;

[0018] The target torque with the lowest specific fuel consumption at each speed point is extracted based on the universal characteristic diagram, and each target torque 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 a medium charge without external charging, thereby reducing the entry into a non-economic state of extremely low charge, and also reducing overcharging into an extremely high charge state.

[0019] In a possible implementation of the first aspect, S300 includes:

[0020] Assume a certain speed x on the target economic torque line and extract the engine specific fuel consumption BSFC at the speed x;

[0021] Calculate the adjusted specific fuel consumption BSFC at speed x x :

[0022] BSFC x =BSFC÷η battery ,

[0023] Where BSFC represents the engine specific fuel consumption at speed x in the target economic torque line;

[0024] According to the adjusted specific fuel consumption BSFCx The adjusted torque corresponding to the speed x is obtained by querying, so as to calculate multiple economic torque lines for different vehicles.

[0025] In a possible implementation of the first aspect, S400 specifically comprises: comparing the adjusted torque at each speed with the target torque; 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 organization of the various torque high points and torque low points of the first economic torque line and the second economic torque line.

[0026] In a possible implementation of the first aspect, in S600, the state of charge of the battery pack is defined as five power level states according to the state of charge signal M, wherein:

[0027] If M≥25%, the battery pack is in the first power state;

[0028] If 25%>M≥21%, the battery pack is in the second power state;

[0029] If 21%>SOC≥19%, the battery pack is in the third state of charge;

[0030] If 19%>SOC≥15%, the battery pack is in the fourth state of charge;

[0031] If SOC is less than 15%, the battery pack is in the fifth state of charge.

[0032] The engine control strategy includes:

[0033] If the battery pack is in the first state of charge, controlling the engine to operate in a pure electric mode;

[0034] If the battery pack is in the second state of charge, 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 lower than the target economic torque line. The engine output power is low, the battery pack has a greater chance of discharging, and the battery pack gradually approaches the medium state of charge.

[0035] If the battery pack is in the third state of charge, the target economic torque line is used as the engine input data to make the engine operate on the target economic torque line. When not charging externally, the vehicle should be mainly in the medium state of charge, so the engine needs to operate on the target economic torque line in this state of charge.

[0036] If the battery pack is in the fourth state of charge, the first economic torque line is used as the engine input data, so that the engine operates on the first economic torque line, which is higher 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 state of charge.

[0037] If the battery pack is in the fifth state of charge, the engine is controlled to operate in full-load mode, allowing the engine to charge the battery pack according to its 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.

[0038] The present invention allows the battery pack to be more easily maintained in high, medium, and low power states, and the engine in these three power states can operate on the economy line, reducing the risk of entering a non-economic state of extremely low power, while also reducing overcharging and entering an extremely high power state. Compared with existing technologies, the fuel consumption of the entire vehicle is improved by 3%.

[0039] In a possible implementation of the first aspect, S200 further includes:

[0040] Obtain the target vehicle's battery pack charge and discharge 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.

[0041] 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 map.

[0042] A torque distribution control system according to an embodiment of a second aspect of the present invention includes:

[0043] Acquisition module, used to obtain the target vehicle's battery pack charge and discharge efficiency η battery and the engine's universal characteristic diagram;

[0044] an extraction module, configured to extract, based on the universal characteristic map, a target torque with the lowest specific fuel consumption at each engine speed to obtain a target economic torque line of the engine;

[0045] A calculation module is used to calculate the adjusted specific fuel consumption at each engine speed based on the target economic torque line and the battery pack charge and discharge efficiency to obtain a one-to-one corresponding adjusted torque;

[0046] 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;

[0047] a generating module, configured to draw a first economic torque line according to the first torque data set and a second economic torque line according to the second torque data set;

[0048] a judgment module, configured to obtain a 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;

[0049] The execution module executes the engine control strategy and outputs the engine torque according to the power state of the battery pack.

[0050] According to a third aspect of an embodiment of the present invention, a vehicle is provided, wherein the vehicle is equipped with a torque distribution control system, and the system is configured to execute the torque distribution control method as described above.

[0051] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0053] Figure 1 is a flow chart of a torque distribution control method according to an embodiment of the present invention;

[0054] 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;

[0055] Figure 3 Schematic diagram of a torque distribution control system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0056] 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.

[0057] 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 referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0059] In the specification, claims, and accompanying drawings of this application, the terms "first," "second," "third," and the like are used to distinguish different objects and are not used to describe a particular order. Furthermore, the terms "including," "comprising," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a list of steps or elements may be included, or alternatively, steps or elements not listed may be included, or other steps or elements may be included that are inherent to the process, method, product, or apparatus.

[0060] Only portions relevant to the present application are shown in the accompanying drawings, not all of them. Before discussing the exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the various operations (or steps) as sequential processes, many of the operations can be performed in parallel, concurrently, or simultaneously. In addition, the order of the various operations can be rearranged. The process can be terminated when its operations are completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0061] As used in this specification, the terms "component," "module," "system," "unit," and the like are used to refer to 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, for example, via local and / or remote processes 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, such as the Internet, which interacts with other systems via signals).

[0062] Example 1

[0063] See 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:

[0064] S100, obtaining the target vehicle's battery pack charge and discharge efficiency η battery and the universal characteristic diagram of the engine, where the target vehicle’s battery pack charge and discharge efficiency η battery Provided by battery supplier;

[0065] S200: Extracting the target torque with the lowest specific fuel consumption at each engine speed based on the universal characteristic map to obtain the target economic torque line of the engine, specifically:

[0066] 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;

[0067] Determine a speed point within the engine speed range according to each speed step;

[0068] The target torque with the lowest specific fuel consumption at each speed point is extracted based on the universal characteristic diagram, and each target torque 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 a medium charge without external charging, thereby reducing the engine from entering a non-economic state with extremely low charge, and also reducing the battery pack from being overcharged and entering a state with extremely high charge.

[0069] It should be noted that in this embodiment, 500 rpm is used as a step length, where the step length can be adjusted according to the accuracy requirements. The step length value given in this embodiment is only an example and cannot be used to limit the scope of protection 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. The speed range is rounded according to the speed step length of 500 rpm to obtain multiple speed points x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, x16, x17, x18, x19, x20, x21, x22, x23, x24, x25, x26, x37, x38, x40, x50, x60, x70, x80, x9, x10, x11, x12, x13, x14, x15, x16, x17, x18, x19, x20, x21 2。。。 x n , n is a positive integer, extract each speed point x1, x2 on the engine universal characteristic map 2。。。 x n The target torque T1 with the lowest specific fuel consumption, T 2。。。 T n , n is a positive integer, each of the target torques T1, T 2。。。 T n Connect them in sequence to obtain the target economic torque line of the engine.

[0070] S300: Calculate the adjusted specific fuel consumption at each engine speed based on the target economic torque line and the battery pack charge and discharge efficiency to obtain a corresponding adjusted torque;

[0071] Taking a certain speed x on the target economic torque line as an example, extract the engine specific fuel consumption BSFC at the speed x;

[0072] Calculate the adjusted specific fuel consumption BSFC at speed x x :

[0073] BSFC x =BSFC÷η battery ,

[0074] Where BSFC represents the engine specific fuel consumption at speed x in the target economic torque line, in g / kWh;

[0075] 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.

[0076] S400: Compare the adjusted torque with the target torque to obtain a first torque data set and a second torque data set, wherein:

[0077] 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 organization of the various torque high points and torque low points of the first economic torque line and the second economic torque line.

[0078] 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;

[0079] 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. The point above the target torque is considered 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 the order of speed. h Connect the torque points in 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 The various torque points within are connected to obtain the second economic torque line, which corresponds to the engine's economic torque low line, that is, three economic torque lines are obtained.

[0080] 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.

[0081] S600: Obtain a current state of charge signal of the battery pack, and determine the state of charge of the battery pack according to the state of charge signal. The state of charge of the battery pack is defined as five charge level states according to the state of charge signal M, including the following:

[0082] If M≥25%, the battery pack is in the first power state, corresponding to the extremely high power state;

[0083] If 25%>M≥21%, the battery pack is in the second power state, corresponding to the high power state;

[0084] If 21%>SOC≥19%, the battery pack is in the third state of charge, corresponding to the medium state of charge;

[0085] If 19%>SOC≥15%, the battery pack is in the fourth power state, corresponding to the low power state;

[0086] If SOC is less than 15%, the battery pack is in the fifth state of charge, which corresponds to extremely low power.

[0087] S700: Execute an engine control strategy to output engine torque based on the battery pack's state of charge, wherein the engine control strategy includes:

[0088] If the battery pack is in the first state of charge, controlling the engine to operate in a pure electric mode;

[0089] If the battery pack is in the second state of charge, 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 lower than the target economic torque line. The engine output power is low, the battery pack has a greater chance of discharging, and the battery pack gradually approaches the medium state of charge.

[0090] If the battery pack is in the third state of charge, the target economic torque line is used as the engine input data to make the engine operate on the target economic torque line. When not charging externally, the vehicle should be mainly in the medium state of charge, so the engine needs to operate on the target economic torque line in this state of charge.

[0091] If the battery pack is in the fourth state of charge, the first economic torque line is used as the engine input data, so that the engine operates on the first economic torque line, which is higher 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 state of charge.

[0092] If the battery pack is in the fifth state of charge, the engine is controlled to operate in full-load mode, allowing the engine to charge the battery pack according to its 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.

[0093] The present invention can make it easier for the battery pack to maintain three power states: high, medium and low. In these three power states, the engine can operate on the economic line, reducing the entry into the non-economic state of extremely low power, and also reducing overcharging into the extremely high power state.

[0094] 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.

[0095] 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 map.

[0096] The torque distribution control method according to an embodiment of the present invention adds two preset relatively economical torque lines above and below the engine's optimal economic line. These lines are used according to the remaining battery charge. This allows the engine to operate economically at high charge levels while increasing the probability of battery discharge, and to operate economically at low charge levels while increasing the probability of battery charge. This achieves the effect of maintaining economical engine operation while facilitating battery balance. While ensuring the engine operates in an economical range, the SOC remains within a relatively balanced range, avoiding the uneconomical state of heavy load generation at extremely low charge levels.

[0097] The vehicle model using the torque distribution control method of this embodiment and the common vehicle model of the prior art were tested for working condition energy consumption. 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 FIG represents the second economic torque line of this embodiment. The following test results are obtained:

[0098] Ordinary vehicles that do not adopt the solution of the present invention are prone to enter an extremely low power state and high-power generation in an uneconomical state when operating uphill; and are more likely to enter an extremely high power state when operating downhill.

[0099] The test vehicle using the solution of the present invention basically maintained three power states: high, medium, and low during uphill and downhill conditions, and improved its fuel consumption by 3% compared with ordinary vehicles that did not use the solution of the present invention.

[0100] Example 2

[0101] See Figure 3 As shown, this embodiment provides a torque distribution control system, which includes:

[0102] Acquisition module, used to obtain the target vehicle's battery pack charge and discharge efficiency ηbattery and the engine's universal characteristic diagram;

[0103] An extraction module is configured to extract, based on the universal characteristic map, a target torque with the lowest specific fuel consumption at each engine speed to obtain a target economic torque line of the engine, including:

[0104] The engine speed range and the specific fuel consumption of the engine speed are obtained according to the universal characteristic map, and the speed step is set.

[0105] Determine a speed point within the engine speed range according to each speed step;

[0106] Extracting the target torque with the lowest specific fuel consumption at each speed point based on the universal characteristic map, and sequentially connecting each of the target torques to obtain the target economic torque line of the engine (i.e., the optimal economic torque line of the engine). This helps ensure that the engine torque output is on the optimal economic torque line when the battery pack is at a medium charge and no external charging is required, thereby preventing the engine from entering an extremely low charge state and preventing the battery pack from being overcharged and entering an extremely high charge state.

[0107] The calculation module is used to calculate the adjusted specific fuel consumption at each engine speed based on the target economic torque line and the battery pack charge and discharge efficiency to obtain a one-to-one adjusted torque, specifically:

[0108] Assume a certain speed x on the target economic torque line and extract the engine specific fuel consumption BSFC at the speed x;

[0109] Calculate the adjusted specific fuel consumption BSFC at speed x x :

[0110] BSFC x =BSFC÷η battery ,

[0111] Where BSFC represents the engine specific fuel consumption at speed x in the target economic torque line;

[0112] 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;

[0113] 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. 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, thereby facilitating 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;

[0114] a generating module, configured to draw a first economic torque line according to the first torque data set and a second economic torque line according to the second torque data set;

[0115] The determination module is configured to obtain a current state of charge signal of the battery pack and determine 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:

[0116] If M≥25%, the battery pack is in the first power state, corresponding to the extremely high power state;

[0117] If 25%>M≥21%, the battery pack is in the second power state, corresponding to the high power state;

[0118] If 21%>SOC≥19%, the battery pack is in the third state of charge, corresponding to the medium state of charge;

[0119] If 19%>SOC≥15%, the battery pack is in the fourth power state, corresponding to the low power state;

[0120] If SOC is less than 15%, the battery pack is in the fifth state of charge, corresponding to extremely low power;

[0121] 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:

[0122] If the battery pack is in the first state of charge, controlling the engine to operate in a pure electric mode;

[0123] If the battery pack is in the second state of charge, 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 lower than the target economic torque line. The engine output power is low, the battery pack has a greater chance of discharging, and the battery pack gradually approaches the medium state of charge.

[0124] If the battery pack is in the third state of charge, the target economic torque line is used as the engine input data to make the engine operate on the target economic torque line. When not charging externally, the vehicle should be mainly in the medium state of charge, so the engine needs to operate on the target economic torque line in this state of charge.

[0125] If the battery pack is in the fourth state of charge, the first economic torque line is used as the engine input data, so that the engine operates on the first economic torque line, which is higher 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 state of charge.

[0126] If the battery pack is in the fifth state of charge, the engine is controlled to operate in full-load mode, allowing the engine to charge the battery pack according to its 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.

[0127] In the embodiments of the present application, a torque distribution control system 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. For example, the mobile electronic device may be a mobile phone, tablet computer, laptop computer, PDA, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), while the non-mobile electronic device may be a server, network attached storage (NAS), personal computer (PC), etc., without specific limitations in the embodiments of the present application.

[0128] In the embodiment of the present application, a torque distribution control system 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.

[0129] The torque distribution control system provided in the embodiment of the present application can achieve Figure 1 The various processes of the torque distribution control method implemented in the embodiment of the method will not be described here in detail to avoid repetition.

[0130] The torque distribution control system of this embodiment has the following beneficial effects: Based on the engine's optimal economy line, two relatively economical torque lines are preset above and below. Different economic torque lines are used depending on the remaining battery charge. This allows the engine to operate economically at high charge while increasing the probability of battery pack discharge, and to operate economically at low charge while increasing the probability of battery pack charge. This achieves the effect of economic engine operation while facilitating the maintenance of electrical balance. While ensuring the engine operates in an economical range, the SOC remains within a relatively balanced range, avoiding the uneconomical state of heavy load power generation at extremely low charge levels.

[0131] 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, 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, they will not be described here.

[0132] 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.

[0133] 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), random access memory (RAM), a magnetic disk, or an optical disk.

[0134] Example 3

[0135] 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.

[0136] In the description of the present invention, it should 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" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 operate in a specific orientation, and therefore should not be understood as a limitation to the invention.

[0137] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0138] Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of 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 does not necessarily mean that they are all the same embodiments, nor are they independent or alternative embodiments that are mutually exclusive with other embodiments. It can be understood explicitly and implicitly 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 those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0139] While 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 invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A torque distribution control method, characterized in that: include: S100, obtaining the target vehicle's battery pack charge and discharge efficiency η battery and the engine's universal characteristic diagram; S200, extracting the target torque with the lowest specific fuel consumption at each engine speed based on the universal characteristic map to obtain a target economic torque line of the engine; S300: Calculate the adjusted specific fuel consumption at each engine speed based on the target economic torque line and the battery pack charge and discharge efficiency to obtain a 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 the 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, specifically defining the state of charge of the battery pack into five power level states according to the state of charge 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 state of charge; If 19%>SOC≥15%, the battery pack is in the fourth state of charge; If SOC is less than 15%, the battery pack is in the fifth state of charge; S700: Execute an engine control strategy to output engine torque based on the battery pack's state of charge, wherein the engine control strategy includes: If the battery pack is in the first state of charge, controlling the engine to operate in a pure electric mode; If the battery pack is in the second state of charge, the second economic torque line is used as engine input data; If the battery pack is in the third state of charge, the target economic torque line is used as the engine input data; If the battery pack is in the fourth state of charge, the first economic torque line is used as 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.

2. The torque distribution control method according to claim 1, characterized in that: S200 includes: Obtain the engine speed range and specific fuel consumption at the engine speed, and set the speed step size; 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: Assume a certain speed x on the target economic torque line and 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 Query and obtain the adjustment torque corresponding to the speed x.

4. The torque distribution control method according to claim 1, characterized in that: 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, the adjusted torque is assigned to the second torque data set.

5. The torque distribution control method according to claim 1, characterized in that: The S200 also includes: Obtain the target vehicle's battery pack charge and discharge 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 map.

6. The torque distribution control method according to claim 5, characterized in that: The driving parameters include vehicle speed, engine speed, and fuel consumption.

7. A torque distribution control system, characterized in that: include: Acquisition module, used to obtain the target vehicle's battery pack charge and discharge efficiency η battery and the engine's universal characteristic diagram; An extraction module is configured to extract the target torque with the lowest specific fuel consumption at each engine speed according to the universal characteristic map to obtain a target economic torque line of the engine; A calculation module is used to calculate the adjusted specific fuel consumption at each engine speed based on the target economic torque line and the battery pack charge and discharge efficiency to obtain a one-to-one corresponding adjusted torque; 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 a second economic torque line according to the second torque data set; The judgment 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. Specifically, according to the state of charge signal M, the state of charge of the battery pack is defined as five power level states, 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 state of charge; If 19%>SOC≥15%, the battery pack is in the fourth state of charge; If SOC is less than 15%, the battery pack is in the fifth state of charge; An execution module executes an engine control strategy and outputs engine torque according to the state of charge of the battery pack, wherein the engine control strategy includes: If the battery pack is in the first state of charge, controlling the engine to operate in a pure electric mode; If the battery pack is in the second state of charge, the second economic torque line is used as engine input data; If the battery pack is in the third state of charge, the target economic torque line is used as the engine input data; If the battery pack is in the fourth state of charge, the first economic torque line is used as 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.

8. A vehicle, characterized in that: The vehicle is equipped with a torque distribution control system configured to execute the torque distribution control method according to any one of claims 1 to 5.

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