Methods, devices, vehicles, and storage media for determining vehicle charging torque

Abstract

This application relates to a method, apparatus, vehicle, and storage medium for determining vehicle charging torque, comprising: acquiring the current vehicle's driving torque demand, battery charging / discharging torque demand, and accessory consumption torque to obtain the engine demand torque; determining the assist torque limits of a first engine to a third engine respectively, and taking the maximum value as the target engine assist torque limit; obtaining the engine torque limit based on the smaller value between the engine noise load limit and the target engine assist torque limit; determining the remaining engine torque based on the engine torque limit and the engine demand torque; and simultaneously obtaining the battery charging torque limit based on the remaining engine torque and the battery charging / discharging torque demand. The target charging torque is then determined based on the battery charging torque limit, and the vehicle is charged. This solves the problem that the method for determining the battery charging torque limit considers only one factor, thus affecting engine fuel economy.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a method, apparatus, vehicle, and storage medium for determining vehicle charging torque. Background Technology

[0002] With economic development, the country is paying more and more attention to environmental protection, energy conservation and sustainable development. Hybrid vehicles use both engines and power batteries as the vehicle's power source, and achieve optimal power matching and energy management through mode switching management, as well as the distribution of power and torque of each component in each mode. When the vehicle speed is high and the series capability cannot meet the user's driving needs, but the parallel capability is large, it is necessary to switch to parallel mode to meet the driving drive needs and the charging and discharging needs of the battery.

[0003] In related technologies, the method for determining the battery charging torque limit in the parallel mode of hybrid electric vehicles mainly involves determining the charging torque based on the engine's high-efficiency torque and the user's required torque.

[0004] However, the above method for determining the battery charging torque limit considers only one factor, which may affect engine fuel economy and reduce the user's driving experience. Summary of the Invention

[0005] This application provides a method, apparatus, vehicle, and storage medium for determining vehicle charging torque, in order to solve the problem that the method for determining the battery charging torque limit considers only one factor, thereby affecting engine fuel economy.

[0006] The first aspect of this application provides a method for determining the charging torque of a vehicle, comprising the following steps:

[0007] The system obtains the current vehicle's driving torque requirement, the battery charging and discharging torque requirement to maintain a preset battery SOC (State of Charge) balance value, and the current vehicle's accessory consumption torque.

[0008] The engine torque required for the current vehicle is obtained based on the driving torque requirement, the battery charging and discharging torque requirement, and the accessory consumption torque.

[0009] Determine the first engine assist torque limit, the second engine assist torque limit, and the third engine assist torque limit of the current vehicle, and take the largest engine assist torque limit among the first engine assist torque limit, the second engine assist torque limit, and the third engine assist torque limit as the target engine assist torque limit.

[0010] An engine noise load limit is determined. An engine torque limit is obtained based on the smaller of the engine noise load limit and the target engine assist torque limit. The remaining engine torque is determined based on the engine torque limit and the engine demand torque. A battery charging torque limit is obtained based on the remaining engine torque and the battery charging and discharging demand torque to maintain a preset battery SOC balance value. The target charging torque for the current vehicle is determined based on the engine demand torque or the battery charging torque limit. The current vehicle is then charged according to the target charging torque.

[0011] According to one embodiment of this application, obtaining the driving torque demand of the current vehicle, the battery charging and discharging torque demand to maintain a preset battery SOC balance value, and the accessory consumption torque of the current vehicle includes:

[0012] The system acquires the accelerator pedal information, vehicle speed information, actual battery SOC value, accessory power consumption, and generator efficiency of the current vehicle.

[0013] The accelerator pedal information and the vehicle speed information are parsed, and the driving torque required by the current vehicle is determined based on a preset first mapping table of accelerator pedal and vehicle speed.

[0014] The battery SOC coefficient is determined based on a first proportional relationship between a preset battery SOC balance value and the actual battery SOC value. The battery charging and discharging strategy is determined based on the battery SOC coefficient. The battery charging and discharging torque required to maintain the preset battery SOC balance value is determined based on the charging and discharging strategy.

[0015] The accessory power consumption torque of the current vehicle is obtained based on the accessory power consumption and generator efficiency.

[0016] According to one embodiment of this application, determining the first engine-assisted torque limit, the second engine-assisted torque limit, and the third engine-assisted torque limit of the current vehicle includes:

[0017] The engine speed, accelerator pedal opening, and battery charging power of the current vehicle are obtained.

[0018] The engine assist torque value is determined based on the engine speed, and a second mapping table between the battery charging torque limit SOC coefficient and the battery SOC coefficient is determined based on the second proportional relationship between the battery SOC coefficient and the actual battery SOC value. The engine assist torque value is adjusted according to the second mapping table to obtain the first engine assist torque limit.

[0019] The limit of the assist torque of the second engine is determined based on the accelerator pedal opening.

[0020] The limit of the third engine's assist torque is determined based on the battery's allowable charging power and the battery's SOC coefficient.

[0021] According to one embodiment of this application, determining the engine noise load limit includes:

[0022] The engine noise load limit is obtained based on the current engine speed and the current accelerator pedal information of the vehicle.

[0023] According to one embodiment of this application, after obtaining the engine demand torque of the current vehicle based on the drive demand torque, the battery charge / discharge demand torque, and the accessory consumption torque, the method further includes:

[0024] Determine whether the current engine torque demand of the vehicle is greater than the lower limit of the engine torque in the high-efficiency region;

[0025] If the current engine torque requirement of the vehicle is greater than the lower limit of the engine torque in the high-efficiency region, the current engine torque requirement of the vehicle will continue to be maintained; otherwise, the remaining engine torque will be increased to the required engine torque.

[0026] According to the vehicle charging torque determination method of this application embodiment, the current vehicle's driving torque demand, battery charging and discharging torque demand, accessory consumption torque, and engine noise load limit are obtained to obtain the engine demand torque. The assist torque limits of the first to third engines are determined respectively, and the maximum value among them is taken as the target engine assist torque limit. The engine torque limit is obtained based on the smaller value between the engine noise load limit and the target engine assist torque limit. The remaining engine torque is determined based on the engine torque limit and the engine demand torque. At the same time, the battery charging torque limit is obtained based on the remaining engine torque and the battery charging and discharging torque demand. The target charging torque is determined based on the engine demand torque or the battery charging torque limit to charge the current vehicle. Thus, the problem of the battery charging torque limit determination method considering only one factor, which affects the engine fuel economy, is solved. By comprehensively considering the engine's operating conditions, optimal operating range, and other parameters, the engine assist torque limit is determined. The final torque limit is determined by combining user needs, engine noise load limit, and assist torque limit. The remaining engine torque is used for charging while maintaining the SOC balance value.

[0027] A second aspect of this application provides a device for determining the charging torque of a vehicle, comprising:

[0028] The first acquisition module is used to acquire the driving torque required by the current vehicle, the battery charging and discharging torque required to maintain the preset battery SOC balance value, and the accessory consumption torque of the current vehicle.

[0029] The second acquisition module is used to obtain the engine torque required by the current vehicle based on the driving torque requirement, the battery charging and discharging torque requirement, and the accessory consumption torque.

[0030] The first determining module is used to determine the first engine assist torque limit, the second engine assist torque limit, and the third engine assist torque limit of the current vehicle, and to take the largest engine assist torque limit among the first engine assist torque limit, the second engine assist torque limit, and the third engine assist torque limit as the target engine assist torque limit.

[0031] The second determining module is used to determine the engine noise load limit, obtain the engine torque limit based on the smaller of the engine noise load limit and the target engine assist torque limit, determine the remaining engine torque based on the engine torque limit and the engine demand torque, obtain the battery charging torque limit based on the remaining engine torque and the battery charging and discharging demand torque to maintain a preset battery SOC balance value, and determine the target charging torque of the current vehicle based on the engine demand torque or the battery charging torque limit, so as to charge the current vehicle according to the target charging torque.

[0032] According to one embodiment of this application, the first acquisition module includes:

[0033] The first acquisition unit is used to acquire the accelerator pedal information, vehicle speed information, actual SOC value of the battery of the current vehicle, accessory power consumption and generator efficiency of the current vehicle.

[0034] The parsing unit is used to parse the accelerator pedal information and the vehicle speed information, and determine the driving torque required by the current vehicle based on a preset first mapping table of accelerator pedal-vehicle speed.

[0035] The first determining unit is used to determine the battery SOC coefficient based on a first proportional relationship between a preset battery SOC balance value and the actual battery SOC value, determine the battery charging and discharging strategy based on the battery SOC coefficient, and determine the battery charging and discharging torque required to maintain the preset battery SOC balance value based on the charging and discharging strategy.

[0036] The second acquisition unit is used to obtain the accessory consumption torque of the current vehicle based on the accessory power consumption and generator efficiency.

[0037] According to one embodiment of this application, the first determining module includes:

[0038] The third acquisition unit is used to acquire the engine speed, accelerator pedal opening and the battery's allowable charging power of the current vehicle;

[0039] The second determining unit is used to determine the engine assist torque value based on the engine speed, and to determine a second mapping relationship table between the battery charging torque limit SOC coefficient and the battery SOC coefficient based on a second proportional relationship between the battery SOC coefficient and the actual battery SOC value, so as to adjust the engine assist torque value according to the second mapping relationship table to obtain the first engine assist torque limit.

[0040] The third determining unit is used to determine the limit value of the second engine's assist torque based on the accelerator pedal opening.

[0041] The fourth determining unit is used to determine the third engine's assist torque limit based on the battery's allowable charging power and the battery's SOC coefficient.

[0042] According to one embodiment of this application, the first acquisition module includes:

[0043] The fourth acquisition unit is used to obtain the engine noise load limit based on the current engine speed and the current accelerator pedal information of the vehicle.

[0044] According to one embodiment of this application, after obtaining the engine demand torque of the current vehicle based on the driving demand torque, the battery charging and discharging demand torque, and the accessory consumption torque, the second acquisition module further includes:

[0045] The judgment unit is used to determine whether the engine torque demand of the current vehicle is greater than the lower limit of the engine torque in the high-efficiency region;

[0046] The adjustment unit is configured to maintain the current engine torque requirement if the current engine torque requirement of the vehicle is greater than the lower limit of the engine torque in the high-efficiency region; otherwise, increase the remaining engine torque to the required engine torque.

[0047] According to the vehicle charging torque determination device of the present application embodiment, the current vehicle's driving torque demand, battery charging and discharging torque demand, accessory consumption torque, and engine noise load limit are obtained to obtain the engine demand torque. The assist torque limits of the first to third engines are determined respectively, and the maximum value among them is taken as the target engine assist torque limit. The engine torque limit is obtained based on the smaller value between the engine noise load limit and the target engine assist torque limit. The remaining engine torque is determined based on the engine torque limit and the engine demand torque. At the same time, the battery charging torque limit is obtained based on the remaining engine torque and the battery charging and discharging torque demand. The target charging torque is determined based on the engine demand torque or the battery charging torque limit to charge the current vehicle. Thus, the problem of the battery charging torque limit determination method considering only one factor, which affects the engine fuel economy, is solved. The engine assist torque limit is determined by comprehensively considering the engine's operating conditions, optimal operating range, and other parameters. The final torque limit is determined by combining user needs, engine noise load limit, and assist torque limit. The remaining engine torque is used for charging while maintaining the SOC balance value.

[0048] A third aspect of this application provides a vehicle, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for determining the vehicle charging torque as described in the above embodiments.

[0049] A fourth aspect of this application provides a computer-readable storage medium storing computer instructions for causing the computer to perform the vehicle charging torque determination method as described in the above embodiments.

[0050] A fifth aspect of this application provides a computer program product, including a computer program that is executed to implement the method for determining vehicle charging torque as described in the above embodiments.

[0051] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0052] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0053] Figure 1 This is a flowchart of a method for determining vehicle charging torque according to an embodiment of this application;

[0054] Figure 2A flowchart illustrating the determination of a battery charging torque limit according to one embodiment of this application;

[0055] Figure 3 This is a structural diagram of a hybrid electric vehicle according to an embodiment of this application;

[0056] Figure 4 An example diagram of a vehicle charging torque determination device according to an embodiment of this application;

[0057] Figure 5 This is a structural schematic diagram of a vehicle according to an embodiment of this application. Detailed Implementation

[0058] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0059] The following description, with reference to the accompanying drawings, outlines a method, apparatus, vehicle, and storage medium for determining vehicle charging torque according to embodiments of this application. Addressing the issue mentioned in the background art where the method for determining battery charging torque limit considers only one factor, thus affecting engine fuel economy, this application provides a method for determining vehicle charging torque. In this method, the current vehicle's driving torque demand, battery charging / discharging torque demand, accessory consumption torque, and engine noise load limit are obtained to determine the engine's required torque. The assist torque limits for the first to third engines are determined, and the maximum value among them is taken as the target engine's assist torque limit. The engine torque limit is obtained based on the smaller value between the engine noise load limit and the target engine's assist torque limit. Finally, the engine torque limit is determined based on the engine torque limit and the... The engine's remaining torque is determined by the required torque of the engine. Simultaneously, the battery charging torque limit is obtained based on the engine's remaining torque and the battery's charging and discharging torque. The target charging torque is then determined based on either the engine's required torque or the battery charging torque limit to charge the current vehicle. This solves the problem of the battery charging torque limit determination method considering only one factor, which affects the engine's fuel economy. By comprehensively considering parameters such as the engine's operating conditions and optimal operating range, the engine's assist torque limit is determined. Combined with user needs, engine noise load limits, and the assist torque limit, the final torque limit is determined. The remaining engine torque is used for charging while maintaining the SOC balance value.

[0060] Specifically, Figure 1 This is a flowchart illustrating a method for determining vehicle charging torque provided in an embodiment of this application.

[0061] like Figure 1As shown, the method for determining the charging torque of this vehicle includes the following steps:

[0062] In step S101, the current driving torque demand of the vehicle, the battery charging and discharging torque demand to maintain the preset battery SOC balance value, and the accessory consumption torque of the current vehicle are obtained.

[0063] According to one embodiment of this application, obtaining the driving torque demand of the current vehicle, the battery charging and discharging torque demand to maintain a preset battery SOC balance value, and the accessory consumption torque of the current vehicle includes: obtaining the accelerator pedal information, vehicle speed information, the actual battery SOC value of the current vehicle, the accessory power consumption of the current vehicle, and the generator efficiency; parsing the accelerator pedal information and vehicle speed information, and determining the driving torque demand of the current vehicle based on a preset first mapping relationship table of accelerator pedal and vehicle speed; determining the battery SOC coefficient based on a preset first proportional relationship between the battery SOC balance value and the actual battery SOC value, determining the battery charging and discharging strategy based on the battery SOC coefficient, and determining the battery charging and discharging torque demand to maintain the preset battery SOC balance value based on the charging and discharging strategy; and obtaining the accessory consumption torque of the current vehicle based on the accessory power consumption and generator efficiency.

[0064] The preset accelerator pedal-vehicle speed mapping table can be constructed based on the correspondence of historical accelerator pedal-vehicle speed data. The preset battery SOC balance value can be set by those skilled in the art according to actual charging and discharging needs, or it can be obtained through multiple computer simulations. No specific limitations are made here.

[0065] Specifically, in this embodiment, the accelerator pedal information (e.g., accelerator pedal opening), vehicle speed information, including engine speed information and the actual SOC value of the vehicle's battery are first obtained; secondly, the accelerator pedal information and vehicle speed information are parsed, and the driving torque T required by the vehicle is obtained based on the parsing results. Drv The process involves several steps. First, a pre-defined accelerator pedal-vehicle speed mapping table is constructed based on accelerator pedal information and vehicle speed information. This table is used to determine the current vehicle's required driving torque. The calibration principle of this first mapping table is that at the same vehicle speed, the greater the accelerator pedal opening, the greater the requested torque, thus meeting the user's power needs. Simultaneously, at the same accelerator pedal opening, due to limitations imposed by the motor's external characteristics, the higher the vehicle speed, the smaller the requested torque. Next, a target SOC value (i.e., a pre-defined battery SOC balance value) is determined. This pre-defined battery SOC balance value is typically close to the battery's optimal operating range to ensure battery health and extend its lifespan. Then, based on the difference between the pre-defined battery SOC balance value and the actual battery SOC value, the lower limit of battery SOC, the upper limit of battery charging SOC, the limit of battery assistable SOC, and a first proportional relationship, the battery SOC coefficient r is determined.SOC The battery's actual SOC level can be determined by its SOC coefficient. SOC The State of Charge (SOC) is divided into zones. The SOC coefficient determines whether the actual battery SOC falls within the range from the lower limit of the battery SOC to the limit of the battery's assistable SOC, or within the range from the limit of the battery's assistable SOC to the upper limit of the battery's charging SOC. The specific zoning method is not limited; for example, if the actual battery SOC is close to the upper limit, the SOC coefficient may be lower, and vice versa. Based on the SOC coefficient, the battery's charging and discharging strategy is determined. In other words, the SOC coefficient can be used to determine whether the vehicle battery needs more or less charging and discharging, thereby determining the required charging and discharging torque T to maintain a preset battery SOC balance value. SOCchrg T SOCdischrg In order to keep the battery charging and discharging in a balanced state, for example, when the actual SOC of the battery is lower than the preset battery SOC balance value, the engine needs to charge the power battery. The greater the deviation, the greater the charging torque.

[0066] Furthermore, in order to further improve the accuracy of the charging torque, after obtaining the driving torque required by the current vehicle and the charging and discharging torque required to maintain the preset battery SOC balance value, this application embodiment also needs to obtain the accessory consumption torque of the current vehicle. The accessory consumption torque can be obtained based on the accessory power consumption and the generator efficiency. That is, the accessory consumption torque of the current vehicle can be obtained based on the accessory power consumption and the generator efficiency.

[0067] In step S102, the engine torque required for the current vehicle is obtained based on the driving torque demand, the battery charging and discharging torque demand, and the accessory consumption torque.

[0068] Specifically, such as Figure 2 As shown, the accessory power consumption torque in this embodiment can be calculated based on the accessory power consumption and motor efficiency, thereby determining the current vehicle's driving torque T obtained above. Drv The battery charging and discharging torque T required to maintain the preset battery SOC balance value SOCchrg T SOCdischrg and accessories consume torque T Compt Obtain the current engine torque demand T of the vehicle Eng Its expression can be:

[0069] T Eng =T Drv +T Compt +T SOCchrg -T SOCdischrg

[0070] This satisfies users' power requirements as well as their basic needs for maintaining battery SOC and minimizing accessory consumption.

[0071] In step S103, the first engine assist torque limit, the second engine assist torque limit, and the third engine assist torque limit of the current vehicle are determined, and the maximum engine assist torque limit among the first engine assist torque limit, the second engine assist torque limit, and the third engine assist torque limit is taken as the target engine assist torque limit.

[0072] According to one embodiment of this application, determining a first engine-assisted torque limit, a second engine-assisted torque limit, and a third engine-assisted torque limit for a current vehicle includes: acquiring the engine speed, accelerator pedal opening, and battery-allowed charging power of the current vehicle; determining the engine-assisted torque value based on the engine speed, and determining a second mapping relationship table between the battery charging torque limit SOC coefficient and the battery SOC coefficient based on a second proportional relationship between the battery SOC coefficient and the actual battery SOC value, so as to adjust the engine-assisted torque value according to the second mapping relationship table to obtain the first engine-assisted torque limit; determining the second engine-assisted torque limit based on the accelerator pedal opening; and determining the third engine-assisted torque limit based on the battery-allowed charging power and the battery SOC coefficient.

[0073] Specifically, such as Figure 2 As shown, in this embodiment of the application, after obtaining the engine torque required by the current vehicle, it is also necessary to further obtain the engine's assist torque limit, including the first engine assist torque limit T. Lim1 The second engine can assist torque limit T Lim2 And the third engine can assist torque limit T Lim3 .

[0074] Among them, the first engine can assist torque limit T Lim1 This can be determined based on the current engine speed of the vehicle. The higher the engine speed, the greater the torque that the engine can assist with, and it is also based on the battery SOC coefficient r. SOC A second mapping table between the battery charging torque limit SOC coefficient and the battery SOC coefficient is determined based on a second proportional relationship with the actual SOC value of the battery. For example, the actual SOC coefficient of the battery can be used to determine whether the actual SOC of the battery is too high or too low. When the actual SOC of the battery is too high, the battery charging torque limit SOC coefficient is small; when the actual SOC of the battery is too low, the battery charging torque limit SOC coefficient is large. This allows for the adjustment of the engine's assist torque value, resulting in the first engine assist torque limit T. Lim1For example, if the battery SOC coefficient is greater than the threshold, it means that the battery SOC is higher than the upper limit of the battery charging SOC. In this case, there is no need to relax the battery charging torque limit. Therefore, the battery charging torque limit SOC coefficient can be set to 0.9, 0.85, etc., without specific restrictions.

[0075] Furthermore, the second engine can assist in limiting the torque value T. Lim2 The engine's assist limit can be determined based on the accelerator pedal opening. The smaller the accelerator pedal opening, the less demand the user has, and the smaller the engine's assist limit. The larger the accelerator pedal opening, the more demand the user has, and the larger the engine's assist limit.

[0076] Furthermore, the third engine can assist in limiting torque T. Lim3 The minimum allowable charging power of the battery and the battery's state of charge (SOC) coefficient can be determined. The lower the allowable charging power of the battery, the more the engine can increase the assist torque limit to charge the battery.

[0077] Therefore, the first engine assist torque limit T obtained above Lim1 The second engine can assist torque limit T Lim2 And the third engine can assist torque limit T Lim3 The largest engine-assisted torque limit among them is taken as the target engine-assisted torque limit T. BoostLim .

[0078] It should be noted that the larger the battery SOC coefficient, the higher the battery SOC, and the smaller the battery charging torque limit SOC coefficient.

[0079] In step S104, an engine noise load limit is determined. An engine torque limit is obtained based on the smaller of the engine noise load limit and the target engine assist torque limit. The remaining engine torque is determined based on the engine torque limit and the engine demand torque. A battery charging torque limit is obtained based on the remaining engine torque and the battery charging and discharging demand torque to maintain a preset battery SOC balance value. The target charging torque for the current vehicle is determined based on the engine demand torque or the battery charging torque limit. The current vehicle is then charged according to the target charging torque.

[0080] According to one embodiment of this application, determining an engine noise load limit includes: obtaining the engine noise load limit based on the current engine speed of the vehicle and the current accelerator pedal information of the vehicle.

[0081] Specifically, based on user driving comfort considerations, and according to the acceptable engine noise (i.e., NVH (Noise, Vibration, and Harshness) levels) at different engine speeds and accelerator pedal openings, certain limits are imposed on the engine load. After obtaining engine speed and accelerator pedal information (e.g., accelerator pedal opening) in parallel mode, the engine noise load limit T is obtained by looking up the corresponding relationship table. NVH As shown in Table 1, the correspondence table is obtained through specific calibration. The calibration results vary for different vehicle models, but no restrictions are imposed here.

[0082] Table 1

[0083]

[0084] Furthermore, when obtaining the target engine's assistable torque limit, this application obtains the engine torque limit based on the smaller value between the engine noise load limit and the target engine's assistable torque limit, and determines the engine's remaining torque T based on the engine torque limit and the engine's required torque. Add In other words, when the engine's required torque is less than the engine's torque limit, there is surplus torque available to charge the battery. The surplus engine torque value T is determined based on the engine's required torque value and the engine's torque limit. Add Specifically, considering the engine noise load limit and the target engine assist torque limit, the engine torque limit T is determined based on the smaller of the engine noise load limit and the target engine assist torque limit. SOCchrg Among them, the remaining torque T of the engine Add It is expressed as follows:

[0085] T Add =Min{T BoostLim T Lim1 T NVH}-T Eng

[0086] It should be noted that the remaining engine torque T is further determined based on the obtained engine torque limit. Add There is residual torque only when the engine's required torque is less than the engine's torque limit. This residual torque is then used to charge the battery, allowing the engine to operate in its high-efficiency range, thereby improving the overall vehicle economy.

[0087] Furthermore, in this embodiment of the application, after obtaining the remaining engine torque and the engine torque limit, the battery charging torque limit T is obtained based on the remaining engine torque and the battery charging and discharging torque requirement. ChrgLim The battery charging torque limit is calculated by adding the engine's remaining torque to the battery charging and discharging torque required to maintain the preset battery SOC balance value, i.e., T.Chrglim =T SOCchrg +T Add This allows the system to determine the target charging torque for the current vehicle based on the battery charging torque limit, and then charge the vehicle according to the target charging torque. This achieves the goal of meeting the driving torque requirements, the charging and discharging requirements of the power battery, and the torque consumption requirements of accessories, while also taking into account the engine noise load and battery charging capacity. It satisfies the power requirements, makes full use of the engine torque, and avoids battery overcharging.

[0088] According to one embodiment of this application, after obtaining the current engine torque demand of the vehicle based on the driving torque demand, battery charging and discharging torque demand, and accessory consumption torque, the method further includes: determining whether the current engine torque demand of the vehicle is greater than the lower limit of the engine torque in the high-efficiency region; if the current engine torque demand of the vehicle is greater than the lower limit of the engine torque in the high-efficiency region, then the current engine torque demand of the vehicle is maintained; otherwise, the remaining engine torque is increased to the engine torque demand.

[0089] Specifically, such as Figure 3 The diagram shows the structure of a hybrid electric vehicle. When the clutch engages, the engine torque is transmitted to the wheels via the clutch and reduction gear to meet the driving torque requirements. To improve the fuel economy of hybrid electric vehicles, it is generally desirable for the engine to operate in its high-efficiency range. Therefore, this embodiment needs to determine whether the current engine torque demand of the vehicle is greater than the lower limit of the high-efficiency range engine torque. If the current engine torque demand is greater than the lower limit, the current engine torque demand is maintained, i.e., the engine torque demand remains unchanged. If the current engine torque demand is less than or equal to the lower limit, the engine torque demand is increased to the lower limit, ensuring that the engine torque demand remains within the high-efficiency range and guaranteeing engine efficiency and performance. Thus, when the engine torque demand is less than the lower limit, residual engine torque is generated. This residual torque can be used to charge the battery. Therefore, the battery charging torque limit in parallel mode is related to the residual engine torque. The determined parallel charging torque is based on maintaining SOC balance plus the residual engine torque, which can meet the battery's fast charging requirements and improve the driving experience.

[0090] In summary, based on the specific discussion of the above embodiments, the following beneficial effects can be obtained from this application:

[0091] (1) When determining the engine torque limit, this application first determines the engine noise load limit and the engine assist torque limit, and takes the smaller of the two as the engine torque limit, which fully considers the engine noise load and engine torque capability, and improves the overall vehicle driving comfort.

[0092] (2) When determining the limit of the engine's assist torque, this application fully considers the influence of the current SOC of the battery on the engine's assist torque and corrects it through the SOC coefficient to avoid battery overcharging.

[0093] (3) In determining the remaining torque of the engine, this application fully considers the engine torque limit and the engine torque demand, which satisfies the power requirements and improves driving comfort and economy.

[0094] (4) When determining the battery charging torque limit, this application adds the remaining torque as the charging torque on the basis of maintaining the SOC balance charging torque, making full use of the engine's remaining torque and improving the overall vehicle economy.

[0095] According to the vehicle charging torque determination method of this application embodiment, the current vehicle's driving torque requirement, battery charging and discharging torque requirement, accessory consumption torque, and engine noise load limit are obtained to obtain the engine demand torque. The assist torque limits of the first to third engines are determined respectively, and the maximum value among them is taken as the target engine assist torque limit. The engine torque limit is obtained based on the smaller value between the engine noise load limit and the target engine assist torque limit. The remaining engine torque is determined based on the engine torque limit and the engine demand torque. At the same time, the battery charging torque limit is obtained based on the remaining engine torque and the battery charging and discharging torque requirement. The target charging torque is determined based on the engine demand torque or the battery charging torque limit to charge the current vehicle. Thus, the problem of the battery charging torque limit determination method considering only one factor, which affects the engine fuel economy, is solved.

[0096] Next, the device for determining vehicle charging torque according to an embodiment of this application is described with reference to the accompanying drawings.

[0097] Figure 4 This is a block diagram of a vehicle charging torque determination device according to an embodiment of this application.

[0098] like Figure 4 As shown, the vehicle charging torque determining device 10 includes: a first acquisition module 100, a second acquisition module 200, a first determining module 300, and a second determining module 400.

[0099] The first acquisition module 100 is used to acquire the driving torque required by the current vehicle, the battery charging and discharging torque required to maintain the preset battery SOC balance value, and the accessory consumption torque of the current vehicle.

[0100] The second acquisition module 200 is used to obtain the engine torque required by the current vehicle based on the driving torque requirement, the battery charging and discharging torque requirement, and the accessory consumption torque.

[0101] The first determining module 300 is used to determine the first engine assist torque limit, the second engine assist torque limit and the third engine assist torque limit of the current vehicle, and to take the largest engine assist torque limit among the first engine assist torque limit, the second engine assist torque limit and the third engine assist torque limit as the target engine assist torque limit.

[0102] The second determining module 400 is used to determine the engine noise load limit, obtain the engine torque limit based on the smaller value between the engine noise load limit and the target engine assist torque limit, determine the remaining engine torque based on the engine torque limit and the engine demand torque, obtain the battery charging torque limit based on the remaining engine torque and the battery charging and discharging demand torque to maintain the preset battery SOC balance value, and determine the target charging torque of the current vehicle based on the engine demand torque or the battery charging torque limit, so as to charge the current vehicle according to the target charging torque.

[0103] According to one embodiment of this application, the first acquisition module 100 includes:

[0104] The first acquisition unit is used to acquire the accelerator pedal information, vehicle speed information, actual SOC value of the battery of the current vehicle, power consumption of the accessories of the current vehicle, and generator efficiency.

[0105] The parsing unit is used to parse the accelerator pedal information and vehicle speed information, and determine the current driving torque demand of the vehicle based on the preset first mapping relationship table of accelerator pedal-vehicle speed.

[0106] The first determining unit is used to determine the battery SOC coefficient based on a first proportional relationship between a preset battery SOC balance value and the actual battery SOC value, determine the battery charging and discharging strategy based on the battery SOC coefficient, and determine the battery charging and discharging torque required to maintain the preset battery SOC balance value based on the charging and discharging strategy.

[0107] The second acquisition unit is used to obtain the accessory consumption torque of the current vehicle based on the accessory power consumption and generator efficiency.

[0108] According to one embodiment of this application, the first determining module 300 includes:

[0109] The third acquisition unit is used to acquire the current engine speed, accelerator pedal opening and battery charging power of the vehicle.

[0110] The second determining unit is used to determine the engine assist torque value based on the engine speed, and to determine the second mapping relationship table between the battery charging torque limit SOC coefficient and the battery SOC coefficient based on the second proportional relationship between the battery SOC coefficient and the actual battery SOC value, so as to adjust the engine assist torque value according to the second mapping relationship table to obtain the first engine assist torque limit.

[0111] The third determining unit is used to determine the limit of the second engine's assist torque based on the accelerator pedal opening.

[0112] The fourth determining unit is used to determine the limit of the third engine's assist torque based on the battery's allowable charging power and the battery's SOC coefficient.

[0113] According to one embodiment of this application, the first acquisition module 100 includes:

[0114] The fourth acquisition unit is used to obtain the engine noise load limit based on the current engine speed and the current accelerator pedal information of the vehicle.

[0115] According to one embodiment of this application, after obtaining the engine torque demand of the current vehicle based on the driving torque demand, the battery charging and discharging torque demand, and the accessory consumption torque, the second acquisition module 200 further includes:

[0116] The judgment unit is used to determine whether the current engine torque demand of the vehicle is greater than the lower limit of the engine torque in the high-efficiency region;

[0117] The adjustment unit is used to maintain the current engine torque requirement if the current engine torque requirement of the vehicle is greater than the lower limit of the engine torque in the high-efficiency region; otherwise, it increases the remaining engine torque to the required engine torque.

[0118] According to the vehicle charging torque determination device of the present application embodiment, the current vehicle's driving torque demand, battery charging and discharging torque demand, accessory consumption torque, and engine noise load limit are obtained to obtain the engine demand torque. The assist torque limits of the first to third engines are determined respectively, and the maximum value among them is taken as the target engine assist torque limit. The engine torque limit is obtained based on the smaller value between the engine noise load limit and the target engine assist torque limit. The remaining engine torque is determined based on the engine torque limit and the engine demand torque. At the same time, the battery charging torque limit is obtained based on the remaining engine torque and the battery charging and discharging torque demand. The target charging torque is determined based on the engine demand torque or the battery charging torque limit to charge the current vehicle. Thus, the problem of the battery charging torque limit determination method considering only one factor, which affects the engine fuel economy, is solved. The engine assist torque limit is determined by comprehensively considering the engine's operating conditions, optimal operating range, and other parameters. The final torque limit is determined by combining user needs, engine noise load limit, and assist torque limit. The remaining engine torque is used for charging while maintaining the SOC balance value.

[0119] Figure 5 A schematic diagram of the structure of a vehicle provided in an embodiment of this application. The vehicle may include:

[0120] The memory 501, the processor 502, and the computer program stored on the memory 501 and capable of running on the processor 502.

[0121] When the processor 502 executes the program, it implements the method for determining the vehicle charging torque provided in the above embodiments.

[0122] Furthermore, the vehicle also includes:

[0123] Communication interface 503 is used for communication between memory 501 and processor 502.

[0124] The memory 501 is used to store computer programs that can run on the processor 502.

[0125] The memory 501 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0126] If the memory 501, processor 502, and communication interface 503 are implemented independently, then the communication interface 503, memory 501, and processor 502 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 5 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0127] Optionally, in a specific implementation, if the memory 501, processor 502, and communication interface 503 are integrated on a single chip, then the memory 501, processor 502, and communication interface 503 can communicate with each other through an internal interface.

[0128] Processor 502 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0129] This embodiment also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described method for determining vehicle charging torque.

[0130] This embodiment also provides a computer program product, including a computer program that is executed to implement the method for determining vehicle charging torque described in the above embodiment.

[0131] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0132] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0133] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0134] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which programs can be printed, because programs can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0135] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0136] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by a program instructing related hardware, and the program can be stored in a computer-readable storage medium. When executed, the program includes one or a combination of the steps of the method embodiments.

[0137] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0138] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A method for determining the charging torque of a vehicle, characterized in that, Includes the following steps: The driving torque required by the current vehicle, the charging and discharging torque required to maintain the preset battery SOC balance value, and the accessory consumption torque of the current vehicle are obtained. The engine torque required for the current vehicle is obtained based on the driving torque requirement, the battery charging and discharging torque requirement, and the accessory consumption torque. Determine the first engine assist torque limit, the second engine assist torque limit, and the third engine assist torque limit of the current vehicle, and take the largest engine assist torque limit among the first engine assist torque limit, the second engine assist torque limit, and the third engine assist torque limit as the target engine assist torque limit. An engine noise load limit is determined. An engine torque limit is obtained based on the smaller of the engine noise load limit and the target engine assist torque limit. The remaining engine torque is determined based on the engine torque limit and the engine demand torque. A battery charging torque limit is obtained based on the remaining engine torque and the battery charging and discharging demand torque to maintain a preset battery SOC balance value. The target charging torque for the current vehicle is determined based on the engine demand torque or the battery charging torque limit. The current vehicle is then charged according to the target charging torque.

2. The method according to claim 1, characterized in that, The process of obtaining the current vehicle's drive torque requirement, the battery charging / discharging torque requirement to maintain a preset battery SOC balance value, and the current vehicle's accessory consumption torque includes: Obtain the accelerator pedal information, vehicle speed information, actual SOC value of the battery of the current vehicle, power consumption of the accessories of the current vehicle, and generator efficiency; The accelerator pedal information and the vehicle speed information are parsed, and the driving torque required by the current vehicle is determined based on a preset first mapping table of accelerator pedal and vehicle speed. The battery SOC coefficient is determined based on a first proportional relationship between a preset battery SOC balance value and the actual battery SOC value. The battery charging and discharging strategy is determined based on the battery SOC coefficient. The battery charging and discharging torque required to maintain the preset battery SOC balance value is determined based on the charging and discharging strategy. The accessory power consumption torque of the current vehicle is obtained based on the accessory power consumption and generator efficiency.

3. The method according to claim 1, characterized in that, Determining the first engine assist torque limit, the second engine assist torque limit, and the third engine assist torque limit of the current vehicle includes: The engine speed, accelerator pedal opening, and battery charging power of the current vehicle are obtained. The engine assist torque value is determined based on the engine speed, and a second mapping table between the battery charging torque limit SOC coefficient and the battery SOC coefficient is determined based on the second proportional relationship between the battery SOC coefficient and the actual battery SOC value. The engine assist torque value is adjusted according to the second mapping table to obtain the first engine assist torque limit. The limit of the assist torque of the second engine is determined based on the accelerator pedal opening. The limit of the third engine's assist torque is determined based on the battery's allowable charging power and the battery's SOC coefficient.

4. The method according to claim 1, characterized in that, Determining the engine noise load limit includes: The engine noise load limit is determined based on the current engine speed and the current accelerator pedal information of the vehicle.

5. The method according to claim 1, characterized in that, After obtaining the current vehicle's engine torque requirement based on the drive torque requirement, the battery charging / discharging torque requirement, and the accessory consumption torque, the method further includes: Determine whether the current engine torque demand of the vehicle is greater than the lower limit of the engine torque in the high-efficiency region; If the current engine torque requirement of the vehicle is greater than the lower limit of the engine torque in the high-efficiency region, the current engine torque requirement of the vehicle will continue to be maintained; otherwise, the remaining engine torque will be increased to the required engine torque.

6. A device for determining the charging torque of a vehicle, characterized in that, include: The first acquisition module is used to acquire the driving torque required by the current vehicle, the battery charging and discharging torque required to maintain the preset battery SOC balance value, and the accessory consumption torque of the current vehicle. The second acquisition module is used to obtain the engine torque required by the current vehicle based on the driving torque requirement, the battery charging and discharging torque requirement, and the accessory consumption torque. The first determining module is used to determine the first engine assist torque limit, the second engine assist torque limit, and the third engine assist torque limit of the current vehicle, and to take the largest engine assist torque limit among the first engine assist torque limit, the second engine assist torque limit, and the third engine assist torque limit as the target engine assist torque limit. The second determining module is used to determine the engine noise load limit, obtain the engine torque limit based on the smaller of the engine noise load limit and the target engine assist torque limit, determine the remaining engine torque based on the engine torque limit and the engine demand torque, obtain the battery charging torque limit based on the remaining engine torque and the battery charging and discharging demand torque to maintain a preset battery SOC balance value, and determine the target charging torque of the current vehicle based on the engine demand torque or the battery charging torque limit, so as to charge the current vehicle according to the target charging torque.

7. The apparatus according to claim 6, characterized in that, The first acquisition module includes: The first acquisition unit is used to acquire the accelerator pedal information, vehicle speed information, actual SOC value of the battery of the current vehicle, accessory power consumption and generator efficiency of the current vehicle. The parsing unit is used to parse the accelerator pedal information and the vehicle speed information, and determine the driving torque required by the current vehicle based on a preset first mapping table of accelerator pedal-vehicle speed. The first determining unit is used to determine the battery SOC coefficient based on a first proportional relationship between a preset battery SOC balance value and the actual battery SOC value, determine the battery charging and discharging strategy based on the battery SOC coefficient, and determine the battery charging and discharging torque required to maintain the preset battery SOC balance value based on the charging and discharging strategy. The second acquisition unit is used to obtain the accessory consumption torque of the current vehicle based on the accessory power consumption and generator efficiency.

8. The apparatus according to claim 6, characterized in that, The first determining module includes: The third acquisition unit is used to acquire the engine speed, accelerator pedal opening and the battery's allowable charging power of the current vehicle; The second determining unit is used to determine the engine assist torque value based on the engine speed, and to determine a second mapping relationship table between the battery charging torque limit SOC coefficient and the battery SOC coefficient based on a second proportional relationship between the battery SOC coefficient and the actual battery SOC value, so as to adjust the engine assist torque value according to the second mapping relationship table to obtain the first engine assist torque limit. The third determining unit is used to determine the limit value of the second engine's assist torque based on the accelerator pedal opening. The fourth determining unit is used to determine the limit of the third engine's assist torque based on the battery's allowable charging power and the battery's SOC coefficient.

9. A vehicle, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the method for determining vehicle charging torque as described in any one of claims 1-5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the method for determining the vehicle charging torque as described in any one of claims 1-5.

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