Vehicle charging torque determination method and device, vehicle and storage medium

Abstract

The invention relates to a vehicle charging torque determination method and device, a vehicle and a storage medium, and the method comprises the steps: obtaining the driving demand torque of the current vehicle, the battery charging and discharging demand torque and the accessory consumption torque, obtaining the engine demand torque, and determining the power-assisted torque limit values of a first engine to a third engine, the maximum value serves as a target engine power-assisted torque limit value, an engine torque limit value is obtained according to the smaller value of the engine noise load limit value and the target engine power-assisted torque limit value, and the engine residual torque is determined according to the engine torque limit value and the engine demand torque; meanwhile, the battery charging torque limit value is obtained according to the engine residual torque and the battery charging and discharging demand torque, the target charging torque is determined based on the battery charging torque limit value, the current vehicle is charged, and therefore the problem that the fuel economy of the engine is affected due to the fact that the consideration factor of the battery charging torque limit determining method is single is solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method, device, vehicle and storage medium for determining vehicle charging torque. Background Art

[0002] With the development of economy, the country attaches more and more importance to environmental protection, energy conservation and sustainable development. Hybrid electric vehicles use engines and power batteries as the power sources of the vehicle at the same time, and achieve the best power matching and energy management through mode switching management, as well as the power and torque distribution of each component in each mode. When the vehicle speed is high and the series capacity cannot meet the user's driving needs, but the parallel capacity is very large, it is necessary to switch to parallel mode to meet the driving needs and battery charging and discharging needs.

[0003] In the related art, the method for determining the battery charging torque limit in the parallel mode of a hybrid vehicle mainly determines the charging torque by the engine high-efficiency torque and the user demand torque.

[0004] However, the above method for determining the battery charging torque limit considers relatively few factors, which may affect the fuel economy of the engine and reduce the driving experience of the user. Summary of the invention

[0005] The present application provides a method, device, vehicle and storage medium for determining vehicle charging torque, so as to solve the problem that the method for determining battery charging torque limit considers only a single factor, thereby affecting the fuel economy of the engine.

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

[0007] Obtaining the current vehicle's driving demand torque, the battery charge and discharge demand torque to maintain a preset battery SOC (State of Charge) balance value, and the accessory consumption torque of the current vehicle;

[0008] Obtaining the engine demand torque of the current vehicle according to the driving demand torque, the battery charging and discharging demand torque and the accessory consumption torque;

[0009] determining a first engine assist torque limit, a second engine assist torque limit, and a third engine assist torque limit of the current vehicle, and using a 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 as a target engine assist torque limit;

[0010] Determine an engine noise load limit, obtain an engine torque limit based on the smaller value of the engine noise load limit and the target engine assist torque limit, and determine an engine residual torque based on the engine torque limit and the engine demand torque, so as to obtain a battery charging torque limit based on the engine residual torque and the battery charge and discharge demand torque for maintaining a preset battery SOC balance value, and determine a target charging torque for 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.

[0011] According to one embodiment of the present application, the step of obtaining the current vehicle's driving demand torque, the battery charging and discharging demand torque for maintaining a preset battery SOC balance value, and the accessory consumption torque of the current vehicle includes:

[0012] Acquiring 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;

[0013] Parsing the accelerator pedal information and the vehicle speed information, and determining the current vehicle driving demand torque based on a preset accelerator pedal-vehicle speed first mapping relationship table;

[0014] Determining the battery SOC coefficient based on a first proportional relationship between a preset battery SOC balance value and an actual battery SOC value, determining a charge and discharge strategy for the battery according to the battery SOC coefficient, and determining a battery charge and discharge required torque for maintaining the preset battery SOC balance value according to the charge and discharge strategy;

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

[0016] According to one embodiment of the present application, 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:

[0017] Obtaining the current engine speed of the vehicle, the accelerator pedal opening, and the charging power allowed by the battery;

[0018] Determine the engine assist torque value according to the engine speed, and 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;

[0019] determining a torque limit value of the second engine according to the accelerator pedal opening;

[0020] The third engine assist torque limit is determined according to the charging power allowed by the battery and the battery SOC coefficient.

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

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

[0023] According to an embodiment of the present application, after obtaining the engine demand torque of the current vehicle according to the driving demand torque, the battery charging and discharging demand torque and the accessory consumption torque, the method further includes:

[0024] Determining whether the engine torque required by the current vehicle is greater than a lower limit value of the engine torque in a high-efficiency region;

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

[0026] According to the method for determining the vehicle charging torque of the embodiment of the present application, the current vehicle's driving demand torque, battery charge and discharge demand torque, accessory consumption torque and engine noise load limit are obtained to obtain the engine demand torque, and the assist torque limits of the first engine to the third engine are determined respectively, and the maximum value thereof is used as the target engine assist torque limit. The engine torque limit is obtained according to the smaller value of the engine noise load limit and the target engine assist torque limit, and the engine residual torque is determined according to the engine torque limit and the engine demand torque. At the same time, the battery charging torque limit is obtained according to the engine residual torque and the battery charge and discharge demand torque, so as to determine the target charging torque for charging the current vehicle based on the engine demand torque or the battery charging torque limit. As a result, the problem that the method for determining the battery charging torque limit considers a single factor, thereby affecting the engine fuel economy, is solved. The engine assist torque limit is determined by comprehensively considering parameters such as the engine's operating conditions and the optimal working area, and the final torque limit is determined in combination with user needs and the engine noise load limit and the assist torque limit, and the engine residual torque is used for charging on the basis of maintaining the SOC balance value.

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

[0028] A first acquisition module, used to acquire a current vehicle driving demand torque, a battery charge and discharge demand torque for maintaining a preset battery SOC balance value, and an accessory consumption torque of the current vehicle;

[0029] A second acquisition module, configured to obtain the engine demand torque of the current vehicle according to the driving demand torque, the battery charging and discharging demand torque and the accessory consumption torque;

[0030] a first determination module, configured to determine a first engine assist torque limit, a second engine assist torque limit, and a third engine assist torque limit of the current vehicle, and to use a 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 as a target engine assist torque limit;

[0031] The second determination module is used to determine the engine noise load limit, obtain the engine torque limit according to the smaller value of the engine noise load limit and the target engine assist torque limit, and determine the engine residual torque according to the engine torque limit and the engine demand torque, so as to obtain the battery charging torque limit based on the engine residual torque and the battery charge and discharge demand torque for maintaining a preset battery SOC balance value, and determine the target charging torque of the current vehicle according to 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 an embodiment of the present application, the first acquisition module includes:

[0033] A first acquisition unit, configured to acquire accelerator pedal information, vehicle speed information, an actual SOC value of a battery of the current vehicle, power consumption of accessories of the current vehicle, and generator efficiency;

[0034] A parsing unit, configured to parse the accelerator pedal information and the vehicle speed information, and determine the driving demand torque of the current vehicle based on a preset first mapping relationship table of accelerator pedal-vehicle speed;

[0035] a first determining unit, configured to determine the battery SOC coefficient based on a first proportional relationship between a preset battery SOC balance value and an actual SOC value of the battery, and determine a charge and discharge strategy of the battery according to the battery SOC coefficient, so as to determine a battery charge and discharge required torque for maintaining the preset battery SOC balance value according to the charge and discharge strategy;

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

[0037] According to an embodiment of the present application, the first determining module includes:

[0038] A third acquisition unit, used to acquire the current engine speed of the vehicle, the accelerator pedal opening and the charging power allowed by the battery;

[0039] a second determination unit, configured to determine the engine assist torque value according to the engine speed, and 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] a third determining unit, configured to determine a torque limit value of the second engine according to the accelerator pedal opening;

[0041] The fourth determining unit is used to determine the third engine assist torque limit value according to the charging power allowed by the battery and the battery SOC coefficient.

[0042] According to an embodiment of the present application, the first acquisition module includes:

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

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

[0045] A judging unit, used to judge whether the engine torque demand of the current vehicle is greater than the lower limit value of the engine torque in the high-efficiency region;

[0046] The adjustment unit is used to continue to maintain the engine demand torque of the current vehicle if the engine demand torque of the current vehicle is greater than the lower limit value of the engine torque in the high-efficiency area, and otherwise increase the engine surplus torque to the engine demand torque.

[0047] According to the vehicle charging torque determination device of the embodiment of the present application, the current vehicle's driving demand torque, battery charge and discharge demand torque, accessory consumption torque and engine noise load limit are obtained to obtain the engine demand torque, and the assist torque limits of the first engine to the third engine are determined respectively, and the maximum value thereof is used as the target engine assist torque limit. The engine torque limit is obtained according to the smaller value of the engine noise load limit and the target engine assist torque limit, and the engine residual torque is determined according to the engine torque limit and the engine demand torque. At the same time, the battery charging torque limit is obtained according to the engine residual torque and the battery charge and discharge demand torque, so as to determine the target charging torque for charging the current vehicle based on the engine demand torque or the battery charging torque limit. As a result, the problem that the method for determining the battery charging torque limit considers a single factor, thereby affecting the engine fuel economy, is solved. The engine assist torque limit is determined by comprehensively considering parameters such as the engine's operating conditions and the optimal working area, and the final torque limit is determined in combination with user needs and the engine noise load limit and the assist torque limit, and the engine residual torque is used for charging on the basis of maintaining the SOC balance value.

[0048] A third aspect of the present application provides a vehicle, comprising: 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 embodiment.

[0049] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method for determining the vehicle charging torque as described in the above embodiment.

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

[0051] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0053] Figure 1 A flowchart of a method for determining a vehicle charging torque according to an embodiment of the present application;

[0054] Figure 2A flow chart for determining a battery charging torque limit value according to an embodiment of the present application;

[0055] Figure 3 A structural diagram of a hybrid vehicle according to an embodiment of the present application;

[0056] Figure 4 is an exemplary diagram of a device for determining a vehicle charging torque according to an embodiment of the present application;

[0057] Figure 5 It is a schematic diagram of the structure of a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

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

[0059] The following describes the vehicle charging torque determination method, device, vehicle and storage medium of the embodiment of the present application with reference to the accompanying drawings. In view of the problem that the battery charging torque limit determination method mentioned in the above background technology considers a single factor, thereby affecting the engine fuel economy, the present application provides a vehicle charging torque determination method, in which the current vehicle driving demand torque, battery charging and discharging demand torque, accessory consumption torque and engine noise load limit are obtained to obtain the engine demand torque, and the assist torque limits of the first engine to the third engine are determined respectively, and the maximum value thereof is used as the target engine assist torque limit, and the engine torque limit is obtained according to the smaller value of the engine noise load limit and the target engine assist torque limit, and the engine torque limit is determined according to the engine torque limit and the engine noise load limit. The engine demand torque determines the remaining torque of the engine, and the battery charging torque limit is obtained according to the remaining torque of the engine and the battery charging and discharging demand torque, so as to determine the target charging torque for charging the current vehicle based on the engine demand torque or the battery charging torque limit. This solves the problem that the method for determining the battery charging torque limit considers a single factor, thereby affecting the fuel economy of the engine. The engine assist torque limit is determined by comprehensively considering parameters such as the engine's operating conditions and the optimal working area, and the final torque limit is determined in combination with user needs, the engine noise load limit and the assist torque limit, and the engine surplus torque is used for charging while maintaining the SOC balance value.

[0060] Specifically, Figure 1 A schematic flow chart of a method for determining vehicle charging torque provided in an embodiment of the present application.

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

[0062] In step S101 , the current vehicle driving demand torque, the battery charge and discharge demand torque for maintaining a preset battery SOC balance value, and the current vehicle accessory consumption torque are obtained.

[0063] According to one embodiment of the present application, the driving demand torque of the current vehicle, the battery charge and discharge demand torque for maintaining a preset battery SOC balance value, and the accessory consumption torque of the current vehicle are obtained, including: obtaining the accelerator pedal information, vehicle speed information, the actual battery SOC value of the current vehicle, the accessory power consumption and generator efficiency of the current vehicle; parsing the accelerator pedal information and vehicle speed information, and determining the driving demand torque of the current vehicle based on a preset accelerator pedal-vehicle speed first mapping relationship table; determining the battery SOC coefficient based on a first proportional relationship between a preset battery SOC balance value and the actual battery SOC value, determining the battery charge and discharge strategy according to the battery SOC coefficient, so as to determine the battery charge and discharge demand torque to maintain the preset battery SOC balance value according to the charge and discharge strategy; obtaining the accessory consumption torque of the current vehicle according to the accessory power consumption and the generator efficiency.

[0064] Among them, the preset first mapping relationship table of accelerator pedal-vehicle speed can be constructed based on the correspondence between accelerator pedal and vehicle speed historical data, and the preset battery SOC balance value can be set by technical personnel in this field according to actual charging and discharging requirements, or it can be obtained through multiple computer simulations, and no specific limitation is made here.

[0065] Specifically, the embodiment of the present application first obtains the accelerator pedal information (such as the accelerator pedal opening) and the vehicle speed information of the current vehicle, including the engine speed information and the actual SOC value of the battery of the current vehicle; secondly, the accelerator pedal information and the vehicle speed information are analyzed, and the driving demand torque T of the current vehicle is obtained according to the analysis result. Drv , wherein a preset first mapping relationship table between the accelerator pedal and the vehicle speed is constructed based on the accelerator pedal information and the vehicle speed information, so as to obtain the current vehicle's driving demand torque based on the preset first mapping relationship table between the accelerator pedal and the vehicle speed, and the calibration principle corresponding to the first mapping relationship table is that at the same vehicle speed, the greater the accelerator pedal opening, the greater the requested torque is to meet the user's power demand, and at the same accelerator pedal opening, limited by the external characteristics of the motor, the higher the vehicle speed, the smaller the requested torque is; again, a SOC target value (i.e., a preset battery SOC balance value) is determined, and the preset battery SOC balance value is usually close to the optimal working range of the battery to ensure the health of the battery and extend its service life, and then the battery SOC coefficient r is determined based on the difference between the preset battery SOC balance value and the actual battery SOC value, the battery SOC lower limit value, the battery charging SOC upper limit value, the battery power SOC limit value, and the first proportional relationship.SOC The actual SOC of the battery can be determined by the battery SOC coefficient. SOC The SOC is partitioned, that is, the battery SOC coefficient can be used to determine whether the actual battery SOC is within the range from the battery SOC lower limit to the battery power-assisted SOC limit or within the range from the battery power-assisted SOC limit to the battery charging SOC upper limit. The specific partitioning method is not limited. For example, if the actual battery SOC value is close to the upper limit, the battery SOC coefficient may be low, and vice versa. The battery charge and discharge strategy is determined according to the battery SOC coefficient. In other words, the battery SOC coefficient can be used to determine whether the vehicle battery needs to be charged and discharged more or less, so as to determine the battery charge and discharge demand torque T to maintain the preset battery SOC balance value according to the charge and discharge strategy. SOCchrg , T SOCdischrg , in order to keep the battery charge and discharge in a balanced state. For example, when the actual SOC of the battery is lower than the preset battery SOC balance value, the engine is required to charge the power battery. The greater the deviation, the greater the charging torque.

[0066] Furthermore, after obtaining the current vehicle's required driving torque and the battery charge and discharge required torque for maintaining a preset battery SOC balance value, the embodiment of the present application also needs to obtain the accessory consumption torque of the current vehicle in order to further improve the charging torque accuracy. 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 current vehicle engine demand torque is obtained according to the driving demand torque, the battery charging and discharging demand torque, and the accessory consumption torque.

[0068] Specifically, Figure 2 As shown, the accessory consumption torque of the embodiment of the present application can be calculated based on the accessory consumption power and the motor efficiency, thereby the current vehicle driving demand torque T obtained above is Drv , the battery charge and discharge demand torque T to maintain the preset battery SOC balance value SOCchrg , T SOCdischrg and accessories consumption torque T Compt Get the current vehicle's engine demand torque T Eng , which can be expressed as:

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

[0070] In this way, the user's power needs and the basic needs of maintaining battery SOC status and accessory consumption are met.

[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 used as the target engine assist torque limit.

[0072] According to one embodiment of the present application, a first engine assist torque limit, a second engine assist torque limit and a third engine assist torque limit of the current vehicle are determined, including: obtaining the engine speed, the accelerator pedal opening and the battery's allowed charging power of the current vehicle; determining the engine assist torque value according to the engine speed, and determining a second mapping relationship table of 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; determining the second engine assist torque limit according to the accelerator pedal opening; and determining the third engine assist torque limit according to the battery's allowed charging power and the battery SOC coefficient.

[0073] Specifically, Figure 2 As shown, in the embodiment of the present application, after obtaining the engine required torque of the current vehicle, it is necessary to further obtain the engine assist torque limit, including the first engine assist torque limit T Lim1 , the second engine can assist the torque limit T Lim2 and the third engine can assist the torque limit T Lim3 .

[0074] Among them, the first engine can assist the torque limit T Lim1 It can be determined based on the current vehicle engine speed. The higher the engine speed, the greater the engine torque value. It is also based on the battery SOC coefficient r SOC The second proportional relationship between the battery actual SOC value and the battery actual SOC value is used to determine a second mapping relationship table between the battery charging torque limit SOC coefficient and the battery SOC coefficient. For example, according to the actual SOC coefficient of the battery, it can be determined 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, thereby adjusting the engine assist torque value to obtain the first engine assist torque limit T Lim1For example, if the battery SOC coefficient is greater than the threshold, it indicates that the battery SOC is higher than the battery charging SOC upper limit. At this time, 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 limitation here.

[0075] Furthermore, the second engine can assist the torque limit T Lim2 It 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 assist limit is. The larger the accelerator pedal opening, the more demand the user has for acceleration, and the larger the engine assist limit is.

[0076] Furthermore, the third engine can assist the torque limit T Lim3 It can be determined based on the charging power allowed by the battery and the battery SOC coefficient. The lower the charging power allowed by the battery, the more the engine can increase the assist torque limit to charge the battery.

[0077] Therefore, the first engine can assist the torque limit T obtained above Lim1 , the second engine can assist the torque limit T Lim2 and the third engine can assist the torque limit T Lim3 , and take the largest engine assist torque limit as the target engine assist torque limit T BoostLim .

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

[0079] In step S104, the engine noise load limit is determined, the engine torque limit is obtained according to the smaller value of the engine noise load limit and the target engine assist torque limit, and the engine residual torque is determined according to the engine torque limit and the engine demand torque, so as to obtain the battery charging torque limit based on the engine residual torque and the battery charge and discharge demand torque for maintaining a preset battery SOC balance value, and the target charging torque of the current vehicle is determined according to the engine demand torque or the battery charging torque limit, so as to charge the current vehicle according to the target charging torque.

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

[0081] Specifically, based on the user's driving comfort considerations, the engine load is restricted to a certain extent according to the engine noise (i.e., NVH (Noise, Vibration, and Harshness) level) that the user can accept at different engine speeds and different accelerator pedal openings. After obtaining the engine speed and accelerator pedal information (such as accelerator pedal opening) in the parallel mode, the engine noise load limit T is obtained by looking up the corresponding relationship table. NVH As shown in Table 1, the corresponding relationship table is obtained through specific calibration. The calibration results of different models are different, so there is no limitation here.

[0082] Table 1

[0083]

[0084] Further, when the target engine assist torque limit is obtained, the present application obtains the engine torque limit according to the smaller value of the engine noise load limit and the target engine assist torque limit, and determines the engine residual torque T according to the engine torque limit and the engine demand torque. Add That is, when the engine demand torque is less than the engine torque limit, there is surplus torque available to charge the battery, so as to determine the engine surplus torque value T according to the engine demand torque value and the engine torque limit. Add Wherein, based on the consideration of the engine noise load limit and the target engine assist torque limit, the engine torque limit T is determined according to the smaller value of the engine noise load limit and the target engine assist torque limit. SOCchrg , where the engine residual torque T 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 engine remaining torque T is further determined based on the obtained engine torque limit value. Add , there is surplus torque only when the engine demand torque is less than the engine torque limit, and the surplus torque is used to charge the battery, allowing the engine to operate in a high-efficiency area, thereby improving the economy of the entire vehicle.

[0087] Furthermore, after obtaining the engine residual torque and the engine torque limit, the embodiment of the present application obtains the battery charging torque limit T according to the engine residual torque and the battery charging and discharging required torque. ChrgLim , based on the battery charge and discharge demand torque to maintain the preset battery SOC balance value, the engine residual torque is added as the battery charging torque limit, that is, TChrglim =T SOCchrg +T Add , thereby determining the target charging torque of the current vehicle based on the battery charging torque limit, so as to charge the current vehicle according to the target charging torque, thereby achieving the goal of meeting the driving demand torque and the power battery charging and discharging demand and the accessory consumption torque demand while taking into account the engine noise load and the battery charging capacity, which not only meets the power demand, but also makes full use of the engine torque to avoid battery overcharging.

[0088] According to one embodiment of the present 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, it also includes: judging whether the engine demand torque of the current vehicle is greater than the lower limit value of the engine torque in the high-efficiency area; if the engine demand torque of the current vehicle is greater than the lower limit value of the engine torque in the high-efficiency area, then continue to maintain the engine demand torque of the current vehicle, otherwise, increase the engine residual torque to the engine demand torque.

[0089] Specifically, Figure 3 As shown, it is a structural diagram of a hybrid vehicle. When the clutch is engaged, the torque of the engine is transmitted to the wheels through the clutch and the reduction device to meet the driving torque demand. In order to improve the economy of hybrid vehicles, it is usually hoped that the engine runs in the high-efficiency area. Therefore, the embodiment of the present application needs to determine whether the engine demand torque of the current vehicle is greater than the lower limit of the engine torque in the high-efficiency area. If the engine demand torque of the current vehicle is greater than the lower limit of the engine torque in the high-efficiency area, the engine demand torque of the current vehicle is continued to be maintained, that is, the engine demand torque is kept unchanged. If the engine demand torque of the current vehicle is less than or equal to the lower limit of the engine torque in the high-efficiency area, the engine demand torque will be increased to the lower limit of the engine torque in the high-efficiency area, so that the engine demand torque can still be maintained in the high-efficiency area to ensure the working efficiency and working performance of the engine. It can be seen that when the engine demand torque is less than the lower limit of the engine torque in the high-efficiency area, the engine surplus torque will be generated, and the engine surplus torque can be used to charge the battery. Therefore, the battery charging torque limit in the parallel mode is related to the engine surplus torque. The determined parallel charging torque is based on maintaining the SOC balance plus the engine surplus torque, which can meet the battery fast charging requirements and improve the driving experience.

[0090] In summary, based on the specific discussion of the above embodiments, the present application can achieve the following beneficial effects:

[0091] (1) When determining the engine torque limit, the present application first determines the smaller of the engine noise load limit and the engine assist torque limit as the engine torque limit, which fully considers the engine noise load and engine torque capacity issues and improves the driving comfort of the whole vehicle;

[0092] (2) When determining the engine assist torque limit, the present application fully considers the impact of the current battery SOC on the engine assist torque, and makes corrections through the SOC coefficient to avoid battery overcharging;

[0093] (3) When determining the residual torque of the engine, the present application fully considers the engine torque limit and the engine required torque, meets the power demand, and improves the driving comfort and economy;

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

[0095] According to the method for determining the vehicle charging torque of the embodiment of the present application, the current vehicle's driving demand torque, battery charge and discharge demand torque, accessory consumption torque and engine noise load limit are obtained to obtain the engine demand torque, and the assistive torque limits of the first to third engines are determined respectively, and the maximum value thereof is used as the target engine assistive torque limit. The engine torque limit is obtained according to the smaller value of the engine noise load limit and the target engine assistive torque limit, and the engine residual torque is determined according to the engine torque limit and the engine demand torque. At the same time, the battery charging torque limit is obtained according to the engine residual torque and the battery charge and discharge demand torque, so as to determine the target charging torque for charging the current vehicle based on the engine demand torque or the battery charging torque limit. This solves the problem that the method for determining the battery charging torque limit considers a single factor, thereby affecting the engine fuel economy.

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

[0097] Figure 4 It is a block diagram of a device for determining vehicle charging torque according to an embodiment of the present application.

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

[0099] The first acquisition module 100 is used to acquire the current vehicle driving demand torque, the battery charge and discharge demand torque for maintaining a preset battery SOC balance value, and the current vehicle accessory consumption torque;

[0100] A second acquisition module 200 is used to obtain the engine demand torque of the current vehicle according to the driving demand torque, the battery charging and discharging demand torque and the accessory consumption torque;

[0101] A first determination module 300 is used to determine a first engine assist torque limit, a second engine assist torque limit, and a third engine assist torque limit of the current vehicle, and use a 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 as a target engine assist torque limit;

[0102] The second determination module 400 is used to determine the engine noise load limit, obtain the engine torque limit according to the smaller value of the engine noise load limit and the target engine assist torque limit, and determine the engine residual torque according to the engine torque limit and the engine demand torque, so as to obtain the battery charging torque limit based on the engine residual torque and the battery charge and discharge demand torque for maintaining a preset battery SOC balance value, and determine the target charging torque of the current vehicle according to 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 an embodiment of the present application, the first acquisition module 100 includes:

[0104] A 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 accessories of the current vehicle, and generator efficiency;

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

[0106] A first determining unit, configured to determine a battery SOC coefficient based on a first proportional relationship between a preset battery SOC balance value and an actual battery SOC value, and determine a battery charge and discharge strategy according to the battery SOC coefficient, so as to determine a battery charge and discharge required torque for maintaining a preset battery SOC balance value according to the charge and discharge strategy;

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

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

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

[0110] a second determination unit, configured to determine the engine assist torque value according to the engine speed, and 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 a first engine assist torque limit;

[0111] a third determining unit, configured to determine a second engine assist torque limit value according to an accelerator pedal opening;

[0112] The fourth determining unit is used to determine the third engine assist torque limit value according to the charging power allowed by the battery and the battery SOC coefficient.

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

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

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

[0116] A judgment unit, used to judge whether the current vehicle engine demand torque is greater than the lower limit value of the engine torque in the high-efficiency area;

[0117] The adjustment unit is used to continue to maintain the engine demand torque of the current vehicle if the engine demand torque of the current vehicle is greater than the lower limit value of the engine torque in the high-efficiency area, otherwise, increase the engine surplus torque to the engine demand torque.

[0118] According to the vehicle charging torque determination device of the embodiment of the present application, the current vehicle's driving demand torque, battery charge and discharge demand torque, accessory consumption torque and engine noise load limit are obtained to obtain the engine demand torque, and the assist torque limits of the first engine to the third engine are determined respectively, and the maximum value thereof is used as the target engine assist torque limit. The engine torque limit is obtained according to the smaller value of the engine noise load limit and the target engine assist torque limit, and the engine residual torque is determined according to the engine torque limit and the engine demand torque. At the same time, the battery charging torque limit is obtained according to the engine residual torque and the battery charge and discharge demand torque, so as to determine the target charging torque for charging the current vehicle based on the engine demand torque or the battery charging torque limit. As a result, the problem that the method for determining the battery charging torque limit considers a single factor, thereby affecting the engine fuel economy, is solved. The engine assist torque limit is determined by comprehensively considering parameters such as the engine's operating conditions and the optimal working area, and the final torque limit is determined in combination with user needs and the engine noise load limit and the assist torque limit, and the engine residual torque is used for charging on the basis of maintaining the SOC balance value.

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

[0120] A memory 501 , a processor 502 , and a computer program stored in the memory 501 and executable on the processor 502 .

[0121] When the processor 502 executes the program, the method for determining the vehicle charging torque provided in the above embodiment is implemented.

[0122] Furthermore, the vehicle also includes:

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

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

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

[0126] If the memory 501, the processor 502 and the communication interface 503 are implemented independently, the communication interface 503, the memory 501 and the processor 502 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

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

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

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

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

[0131] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

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

[0133] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0134] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or otherwise processing in a suitable manner if necessary, and then stored in a computer memory.

[0135] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0136] A person skilled in the art may understand that all or part of the steps in the above-mentioned embodiment method may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0137] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0138] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for determining vehicle charging torque, characterized in that: The following steps are involved: Obtaining a current vehicle driving demand torque, a battery charging and discharging demand torque for maintaining a preset battery SOC balance value, and an accessory consumption torque of the current vehicle; Obtaining the engine demand torque of the current vehicle according to the driving demand torque, the battery charging and discharging demand torque and the accessory consumption torque; determining a first engine assist torque limit, a second engine assist torque limit, and a third engine assist torque limit of the current vehicle, and using a 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 as a target engine assist torque limit; Determine an engine noise load limit, obtain an engine torque limit based on the smaller value of the engine noise load limit and the target engine assist torque limit, and determine an engine residual torque based on the engine torque limit and the engine demand torque, so as to obtain a battery charging torque limit based on the engine residual torque and the battery charge and discharge demand torque for maintaining a preset battery SOC balance value, and determine a target charging torque for 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.

2. The method according to claim 1, characterized in that The obtaining of the current vehicle driving demand torque, the battery charging and discharging demand torque for maintaining a preset battery SOC balance value, and the accessory consumption torque of the current vehicle includes: Acquiring 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; Parsing the accelerator pedal information and the vehicle speed information, and determining the current vehicle driving demand torque based on a preset accelerator pedal-vehicle speed first mapping relationship table; Determining the battery SOC coefficient based on a first proportional relationship between a preset battery SOC balance value and an actual battery SOC value, determining a charge and discharge strategy for the battery according to the battery SOC coefficient, and determining a battery charge and discharge required torque for maintaining the preset battery SOC balance value according to the charge and discharge strategy; The accessory consumption torque of the current vehicle is obtained according to the accessory consumption power and the generator efficiency.

3. The method according to claim 1, characterized in that Determining a first engine assist torque limit, a second engine assist torque limit, and a third engine assist torque limit of the current vehicle includes: Obtaining the current engine speed of the vehicle, the accelerator pedal opening, and the charging power allowed by the battery; Determine the engine assist torque value according to the engine speed, and 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; determining a torque limit value of the second engine according to the accelerator pedal opening; The third engine assist torque limit is determined according to the charging power allowed by the battery and the battery SOC coefficient.

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

5. The method according to claim 1, characterized in that After obtaining the engine demand torque of the current vehicle according to the driving demand torque, the battery charging and discharging demand torque and the accessory consumption torque, the method further includes: Determining whether the engine torque required by the current vehicle is greater than a lower limit value of the engine torque in a high-efficiency region; If the engine torque required by the current vehicle is greater than the lower limit of the engine torque in the high-efficiency region, the engine torque required by the current vehicle is maintained; otherwise, the remaining engine torque is increased to the engine torque required.

6. A device for determining vehicle charging torque, characterized in that: include: A first acquisition module, used to acquire a current vehicle driving demand torque, a battery charge and discharge demand torque for maintaining a preset battery SOC balance value, and an accessory consumption torque of the current vehicle; A second acquisition module, configured to obtain the engine demand torque of the current vehicle according to the driving demand torque, the battery charging and discharging demand torque and the accessory consumption torque; a first determination module, configured to determine a first engine assist torque limit, a second engine assist torque limit, and a third engine assist torque limit of the current vehicle, and to use a 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 as a target engine assist torque limit; The second determination module is used to determine the engine noise load limit, obtain the engine torque limit according to the smaller value of the engine noise load limit and the target engine assist torque limit, and determine the engine residual torque according to the engine torque limit and the engine demand torque, so as to obtain the battery charging torque limit based on the engine residual torque and the battery charge and discharge demand torque for maintaining a preset battery SOC balance value, and determine the target charging torque of the current vehicle according to 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 device according to claim 6, characterized in that The first acquisition module includes: A first acquisition unit, configured to acquire accelerator pedal information, vehicle speed information, an actual SOC value of a battery of the current vehicle, power consumption of accessories of the current vehicle, and generator efficiency; A parsing unit, configured to parse the accelerator pedal information and the vehicle speed information, and determine the driving demand torque of the current vehicle based on a preset first mapping relationship table of accelerator pedal-vehicle speed; a first determining unit, configured to determine the battery SOC coefficient based on a first proportional relationship between a preset battery SOC balance value and an actual SOC value of the battery, and determine a charge and discharge strategy of the battery according to the battery SOC coefficient, so as to determine a battery charge and discharge required torque for maintaining the preset battery SOC balance value according to the charge and discharge strategy; The second acquisition unit is used to obtain the accessory consumption torque of the current vehicle according to the accessory consumption power and the generator efficiency.

8. The device according to claim 6, characterized in that The first determining module includes: A third acquisition unit, used to acquire the current engine speed of the vehicle, the accelerator pedal opening and the charging power allowed by the battery; a second determination unit, configured to determine the engine assist torque value according to the engine speed, and 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; a third determining unit, configured to determine a torque limit value of the second engine according to the accelerator pedal opening; The fourth determining unit is used to determine the third engine assist torque limit value according to the charging power allowed by the battery and the battery 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, wherein the processor executes the program to implement the method for determining the vehicle charging torque as described in any one of claims 1 to 5.

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

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