Vehicle power control system and method
By obtaining the driving data of the preamble vehicle in the vehicle, calculating the front and rear axle torque distribution coefficient of the target vehicle and adjusting the motor torque, the problem of improper torque distribution of the vehicle under fixed distribution is solved, and driving performance and safety are improved.
Patent Information
- Application Number
- CN202411328224.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2024-12-24
AI Technical Summary
Under the fixed front and rear axle torque distribution, existing vehicles are prone to excessive torque distribution of the front or rear axle, resulting in poor driving performance and reduced safety.
By obtaining the driving data of the preamble vehicle on the target road section, the target front and rear axle torque distribution coefficient of the target vehicle under the target steering wheel angle and target total demand torque of the target road section are determined, and the target motor requirements of the front and rear axles are calculated based on this coefficient. Torque for flexible adjustment of power distribution.
The torque distribution of the front and rear axles of the vehicle is more reasonable, ensuring the vehicle's driving smoothly, steering is suitable, driving performance and safety are improved, and driving performance and safety are avoided, resulting in poor driving performance caused by improper intervention in the chassis stability function.
Smart Images
Figure CN119176123A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of vehicle power control, and specifically provides a vehicle power control system and method. Background Art
[0002] In order to improve the passability of new energy vehicles, especially in rainy, snowy days and muddy roads.
[0003] When existing four-wheel drive vehicles are driving, the vehicle controller generally only considers the power performance, and the driving performance is distributed according to the 50-50 distribution coefficient of the front and rear axles to distribute the driving torque of the front and rear axles. The stability control of the whole vehicle is handed over to the chassis controller for protection. The existing chassis stability control functions (TCS, VDC) are based on the vehicle has been unstable, slipping, and then the corresponding torque intervention request to the front and rear axles, and the vehicle controller then limits the driver's front and rear axle torque ratio according to the chassis's torque intervention request to the front and rear axles, and then controls the vehicle. Most of the existing new energy vehicles are equipped with high-horsepower motors, and the torque response of the motors is very fast. Therefore, under the fixed front and rear axle torque distribution, it is very easy to have too much front axle torque distribution or too much rear axle torque distribution. The vehicle understeers or oversteers, making the vehicle difficult to control, resulting in poor vehicle drivability, reduced safety, and poor experience.
[0004] Therefore, there is an urgent need for a vehicle power control system and method to solve the above technical problems. Summary of the invention
[0005] The present invention aims to solve the above technical problem, that is, to solve the problem that under the fixed front and rear axle torque distribution coefficient of existing vehicles, the front axle or rear axle torque distribution is prone to excessive, resulting in poor vehicle drivability.
[0006] In a first aspect, the present invention provides a vehicle power control method, the vehicle power control method comprising the following steps:
[0007] Determining a target front and rear axle torque distribution coefficient of the target vehicle under a target steering wheel angle and a target total required torque of the target section according to the driving data of the preceding vehicle on the target section;
[0008] According to the target front-rear axle torque distribution coefficient and the target total required torque, a front axle target motor required torque and a rear axle target motor required torque of the target vehicle are determined.
[0009] In a specific implementation of the above vehicle power control method, before the step of "determining the target front and rear axle torque distribution coefficient of the target vehicle under the target steering wheel angle and the target total required torque of the target section according to the driving data of the preceding vehicle on the target section", the control method further includes:
[0010] The operation data of the preceding vehicle on the target road section is acquired, and the operation data is extracted to obtain the driving data.
[0011] In a specific implementation of the vehicle power control method, the driving data includes the front and rear axle torque distribution coefficient of the preceding vehicle under the target steering wheel angle and the target total required torque in the target road section;
[0012] “Determining, based on the driving data of the preceding vehicle on the target road section, a target front and rear axle torque distribution coefficient of the target vehicle under a target steering wheel angle and a target total required torque on the target road section” includes:
[0013] Obtaining n front and rear axle torque distribution coefficients of each of the plurality of preceding vehicles under the target steering wheel angle and the target total required torque of the target road section; wherein n is a natural number greater than 1;
[0014] Determining an average front-rear-axle torque distribution coefficient of the preceding vehicle according to the n front-rear-axle torque distribution coefficients of the preceding vehicle;
[0015] The target front-rear-axle torque distribution coefficient of the target vehicle is determined according to the average front-rear-axle torque distribution coefficient of the plurality of preceding vehicles.
[0016] In a specific implementation of the vehicle power control method, “determining the average front and rear axle torque distribution coefficient of the preceding vehicle according to the n front and rear axle torque distribution coefficients of the preceding vehicle” includes:
[0017] S a =M1×S1+M2×S2+…+M n ×S n
[0018] M1+M2+……+M n =1
[0019] M1>M2>……>M n
[0020] S a : Average front and rear axle torque distribution coefficient;
[0021] S1, S2, S n : is the front and rear axle torque distribution coefficient of the preceding vehicle in the target section;
[0022] M: weighting coefficient; the shorter the front and rear axle torque distribution coefficient is from the current time in the time dimension, the larger the value of M.
[0023] In a specific implementation of the vehicle power control method, “determining the target front and rear axle torque distribution coefficient of the target vehicle according to the average front and rear axle torque distribution coefficients of the plurality of preceding vehicles” includes:
[0024] S 目 =(S a1 +S a2 +…+S aY )÷Y
[0025] S a1 , S a2 , S aY : is the average front and rear axle torque distribution coefficient of the plurality of preceding vehicles in the target road section;
[0026] Y: is the number of preceding vehicles;
[0027] S 目 : Target front and rear axle torque distribution coefficient.
[0028] In a specific implementation of the above vehicle power control method, the driving data includes the front and rear axle torque distribution coefficients of the preceding vehicle at each steering wheel angle and each total required torque of the target road section;
[0029] “Determining, based on the driving data of the preceding vehicle on the target road section, a target front and rear axle torque distribution coefficient of the target vehicle under a target steering wheel angle and a target total required torque on the target road section” includes:
[0030] Obtaining n front and rear axle torque distribution coefficients of each of the preceding vehicles at each steering wheel angle and each total required torque in the target road section; wherein n is a natural number greater than 1;
[0031] Determining an average front and rear axle torque distribution coefficient of the preceding vehicle at each steering wheel angle and each total required torque according to the respective n front and rear axle torque distribution coefficients of the preceding vehicle at each steering wheel angle and each total required torque;
[0032] Determining a total average front-rear-axle torque distribution coefficient at each steering wheel angle and each total required torque according to the average front-rear-axle torque distribution coefficient of the plurality of preceding vehicles at each steering wheel angle and each total required torque;
[0033] According to the total average front and rear axle torque distribution coefficients at each steering wheel angle and each total required torque, the target front and rear axle torque distribution coefficients of the target vehicle at the target steering wheel angle and the target total required torque are determined.
[0034] In a specific implementation of the vehicle power control method, “determining the target front and rear axle torque distribution coefficient of the target vehicle at the target steering wheel angle and the target total required torque according to the total average front and rear axle torque distribution coefficient at each steering wheel angle and each total required torque” includes:
[0035] Selecting a plurality of total average front and rear axle torque distribution coefficients having the same steering wheel angle as the target steering wheel angle to obtain a first target group;
[0036] Selecting the total average front and rear axle torque distribution coefficient corresponding to the target total required torque in the first target group to obtain a target total average front and rear axle torque distribution coefficient;
[0037] The target total average front-rear axle torque distribution coefficient is assigned to the target front-rear axle torque distribution coefficient.
[0038] In a specific implementation of the vehicle power control method, “determining the target front and rear axle torque distribution coefficient of the target vehicle at the target steering wheel angle and the target total required torque according to the total average front and rear axle torque distribution coefficient at each steering wheel angle and each total required torque” includes:
[0039] Selecting a plurality of total average front and rear axle torque distribution coefficients having the same steering wheel angle as the target total required torque to obtain a second target group;
[0040] Selecting the total average front and rear axle torque distribution coefficient corresponding to the target steering wheel angle in the target group to obtain a target total average front and rear axle torque distribution coefficient;
[0041] The target total average front-rear axle torque distribution coefficient is assigned to the target front-rear axle torque distribution coefficient.
[0042] In a specific implementation of the vehicle power control method, “determining the front axle target motor required torque and the rear axle target motor required torque of the target vehicle according to the target front and rear axle torque distribution coefficient and the target total required torque” includes:
[0043] Front axle target motor required torque: T1 = T r ×S 目
[0044] Rear axle target motor required torque: T2 = T r ×(1-S 目 )
[0045] T r : Target total required torque;
[0046] S 目 : Target front and rear axle torque distribution coefficient.
[0047] In a second aspect, the present invention provides a vehicle power control system configured to be able to execute the vehicle power control method as described above.
[0048] In the specific implementation of the vehicle power control system, the step of "determining the target front and rear axle torque distribution coefficient of the target vehicle under the target steering wheel angle and the target total required torque in the target section according to the driving data of the preceding vehicle in the target section" is executed by the cloud platform;
[0049] The step of "determining the front axle target motor required torque and the rear axle target motor required torque of the target vehicle according to the target front and rear axle torque distribution coefficient and the target total required torque" is executed by the target vehicle.
[0050] In a specific implementation of the above-mentioned vehicle power control system, the step of "obtaining the operating data of the preceding vehicle on the target road section, and extracting the operating data to obtain the driving data" is executed by a cloud platform.
[0051] When the above-mentioned technical scheme is adopted, the vehicle power control method of the present invention includes the following steps: determining the target front and rear axle torque distribution coefficient of the target vehicle under the target steering wheel angle and the target total required torque in the target section according to the driving data of the preceding vehicle on the target section; the target front and rear axle torque distribution coefficient can be made to be more in line with the actual road conditions of the target section, rather than a fixed value, so that the target front and rear axle torque distribution coefficient of the target vehicle can be made more reasonable; determining the front axle target motor required torque and the rear axle target motor required torque of the target vehicle according to the target front and rear axle torque distribution coefficient and the target total required torque, so that the front and rear axle target motor required torques can be accurately adapted to this section, so that the vehicle travels more smoothly and the steering is more suitable, the driving performance can be better, and the safety and driving experience of the vehicle are guaranteed; in addition, the intervention of the chassis stability function is avoided, which causes the vehicle's drivability to deteriorate.
[0052] In addition, the target front and rear axle torque distribution coefficient is calculated before driving to the target section, and the vehicle drives on the target section according to the front axle target motor demand torque and the rear axle target motor demand torque calculated by the target front and rear axle torque distribution coefficient, instead of performing corresponding torque intervention after instability has occurred. This can ensure that the vehicle runs relatively smoothly and improve the vehicle driving experience.
[0053] Solution 1. A vehicle power control method, characterized in that it includes the following steps:
[0054] Determining a target front and rear axle torque distribution coefficient of the target vehicle under a target steering wheel angle and a target total required torque in the target section according to the driving data of the preceding vehicle in the target section;
[0055] According to the target front-rear axle torque distribution coefficient and the target total required torque, a front axle target motor required torque and a rear axle target motor required torque of the target vehicle are determined.
[0056] Solution 2. The vehicle power control method according to Solution 1 is characterized in that before the step of "determining the target front and rear axle torque distribution coefficient of the target vehicle under the target steering wheel angle and the target total required torque in the target section according to the driving data of the preceding vehicle in the target section", the control method further comprises:
[0057] The operation data of the preceding vehicle on the target road section is acquired, and the operation data is extracted to obtain the driving data.
[0058] Solution 3. The vehicle power control method according to Solution 1 is characterized in that the driving data includes the front and rear axle torque distribution coefficient of the preceding vehicle under the target steering wheel angle and the target total required torque in the target road section;
[0059] “Determining, based on the driving data of the preceding vehicle on the target road section, a target front and rear axle torque distribution coefficient of the target vehicle under a target steering wheel angle and a target total required torque on the target road section” includes:
[0060] Obtaining n front and rear axle torque distribution coefficients of each of the plurality of preceding vehicles under the target steering wheel angle and the target total required torque in the target road section; wherein n is a natural number greater than 1;
[0061] Determining an average front-rear-axle torque distribution coefficient of the preceding vehicle according to the n front-rear-axle torque distribution coefficients of the preceding vehicle;
[0062] The target front-rear-axle torque distribution coefficient of the target vehicle is determined according to the average front-rear-axle torque distribution coefficient of the plurality of preceding vehicles.
[0063] Solution 4. The vehicle power control method according to Solution 3 is characterized in that "determining the average front and rear axle torque distribution coefficient of the preceding vehicle according to the n front and rear axle torque distribution coefficients of the preceding vehicle" comprises:
[0064] S a =M1×S1+M2×S2+…+M n ×S n
[0065] M1+M2+……+M n =1
[0066] M1>M2>……>M n
[0067] S a : Average front and rear axle torque distribution coefficient;
[0068] S1, S2, S n : is the front and rear axle torque distribution coefficient of the preceding vehicle in the target section;
[0069] M: weighting coefficient; the shorter the front and rear axle torque distribution coefficient is from the current time in the time dimension, the larger the value of M.
[0070] Solution 5. The vehicle power control method according to Solution 4 is characterized in that "determining the target front and rear axle torque distribution coefficient of the target vehicle according to the average front and rear axle torque distribution coefficients of the plurality of preceding vehicles" comprises:
[0071] S 目 =(S a1 +S a2 +…+S aY )÷Y
[0072] S a1 , S a2 , S aY : is the average front and rear axle torque distribution coefficient of the plurality of preceding vehicles in the target road section;
[0073] Y: is the number of preceding vehicles;
[0074] S 目 : Target front and rear axle torque distribution coefficient.
[0075] Solution 6. The vehicle power control method according to Solution 1 is characterized in that the driving data includes the front and rear axle torque distribution coefficients of the preceding vehicle at each steering wheel angle and each total required torque in the target section;
[0076] “Determining, based on the driving data of the preceding vehicle on the target road section, a target front and rear axle torque distribution coefficient of the target vehicle under a target steering wheel angle and a target total required torque on the target road section” includes:
[0077] Obtaining n front and rear axle torque distribution coefficients of each of the preceding vehicles at each steering wheel angle and each total required torque in the target road section; wherein n is a natural number greater than 1;
[0078] Determining an average front and rear axle torque distribution coefficient of the preceding vehicle at each steering wheel angle and each total required torque according to the respective n front and rear axle torque distribution coefficients of the preceding vehicle at each steering wheel angle and each total required torque;
[0079] Determining a total average front-rear-axle torque distribution coefficient at each steering wheel angle and each total required torque according to the average front-rear-axle torque distribution coefficient of the plurality of preceding vehicles at each steering wheel angle and each total required torque;
[0080] According to the total average front and rear axle torque distribution coefficients at each steering wheel angle and each total required torque, the target front and rear axle torque distribution coefficients of the target vehicle at the target steering wheel angle and the target total required torque are determined.
[0081] Solution 7. The vehicle power control method according to Solution 6 is characterized in that "determining the target front and rear axle torque distribution coefficient of the target vehicle at the target steering wheel angle and the target total required torque according to the total average front and rear axle torque distribution coefficient at each steering wheel angle and each total required torque" comprises:
[0082] Selecting a plurality of total average front and rear axle torque distribution coefficients having the same steering wheel angle as the target steering wheel angle to obtain a first target group;
[0083] Selecting the total average front and rear axle torque distribution coefficient corresponding to the target total required torque in the first target group to obtain a target total average front and rear axle torque distribution coefficient;
[0084] The target total average front-rear axle torque distribution coefficient is assigned to the target front-rear axle torque distribution coefficient.
[0085] Solution 8. The vehicle power control method according to Solution 6 is characterized in that "determining the target front and rear axle torque distribution coefficient of the target vehicle at the target steering wheel angle and the target total required torque according to the total average front and rear axle torque distribution coefficient at each steering wheel angle and each total required torque" comprises:
[0086] Selecting a plurality of total average front and rear axle torque distribution coefficients having the same steering wheel angle as the target total required torque to obtain a second target group;
[0087] Selecting the total average front and rear axle torque distribution coefficient corresponding to the target steering wheel angle in the target group to obtain a target total average front and rear axle torque distribution coefficient;
[0088] The target total average front-rear axle torque distribution coefficient is assigned to the target front-rear axle torque distribution coefficient.
[0089] Solution 9. The vehicle power control method according to any one of solutions 5 to 8 is characterized in that "determining the front axle target motor required torque and the rear axle target motor required torque of the target vehicle according to the target front and rear axle torque distribution coefficient and the target total required torque" includes:
[0090] Front axle target motor required torque: T1 = T r ×S 目
[0091] Rear axle target motor required torque: T2 = T r ×(1-S 目 )
[0092] T r : Target total required torque;
[0093] S 目 : Target front and rear axle torque distribution coefficient.
[0094] Solution 10. A vehicle power control system, characterized in that it is configured to be able to execute the vehicle power control method as described in any one of Solutions 1-9.
[0095] Solution 11. A vehicle power control system according to Solution 10, characterized in that the step of "determining, based on the driving data of the preceding vehicle on the target road section, the target front and rear axle torque distribution coefficient of the target vehicle under the target steering wheel angle and the target total required torque on the target road section" is executed by the cloud platform;
[0096] The step of "determining the front axle target motor required torque and the rear axle target motor required torque of the target vehicle according to the target front and rear axle torque distribution coefficient and the target total required torque" is executed by the target vehicle.
[0097] Scheme 12. The vehicle power control system according to Scheme 10 that refers to Scheme 2 is characterized in that the step of "obtaining the operating data of the preceding vehicle on the target road section, and extracting the operating data to obtain the driving data" is executed by a cloud platform. BRIEF DESCRIPTION OF THE DRAWINGS
[0098] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:
[0099] Figure 1 is a flow chart of the main steps of the vehicle power control method provided by the first embodiment of the present invention;
[0100] Figure 2 is a detailed flowchart of step S1 of the vehicle power control method provided in the first embodiment of the present invention;
[0101] Figure 3 is a detailed flowchart of step S13 of the vehicle power control method provided in the first embodiment of the present invention;
[0102] Figure 4 is a detailed step flow chart of a vehicle power control method provided in Embodiment 1 of the present invention;
[0103] Figure 5 is a detailed flowchart of step S1 of the vehicle power control method provided in the second embodiment of the present invention;
[0104] Figure 6 is a detailed step flow chart of step S14 of the vehicle power control method provided in the second embodiment of the present invention;
[0105] Figure 7 This is another detailed step flow chart of step S14 of the vehicle power control method provided in the second embodiment of the present invention. DETAILED DESCRIPTION
[0106] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.
[0107] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0108] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0109] In order to solve the problem that the torque distribution of the front or rear axle is too large under the fixed torque distribution coefficient of the front and rear axles of the existing vehicle, resulting in poor vehicle drivability, the present invention discloses a vehicle power control system and method. Three embodiments will be described in detail below.
[0110] Embodiment 1
[0111] This embodiment discloses a vehicle power control method, such as Figure 1 As shown, it includes the following main steps:
[0112] S0, obtaining the operation data of the preceding vehicle on the target road section, and extracting the operation data to obtain the driving data;
[0113] S1. Determine, based on the driving data of the preceding vehicle on the target road section, a target front and rear axle torque distribution coefficient of the target vehicle under a target steering wheel angle and a target total required torque on the target road section;
[0114] S2. Determine a front axle target motor torque requirement and a rear axle target motor torque requirement of the target vehicle according to the target front and rear axle torque distribution coefficient and the target total required torque.
[0115] Through the above method, the target front and rear axle torque distribution coefficient can be made to be more in line with the actual road conditions of the target section, rather than a fixed value, so that the target front and rear axle torque distribution coefficient of the target vehicle can be made more reasonable; and then the optimal front and rear axle target motor demand torque suitable for this section can be accurately calculated, thereby avoiding the intervention of the chassis stability function and causing the vehicle's drivability to deteriorate.
[0116] In addition, the target front and rear axle torque distribution coefficient is calculated before driving to the target section, and the vehicle drives on the target section according to the front axle target motor demand torque and the rear axle target motor demand torque calculated by the target front and rear axle torque distribution coefficient, instead of performing corresponding torque intervention after instability has occurred. This can ensure that the vehicle runs relatively smoothly and improve the vehicle driving experience.
[0117] Wherein, step S0 includes: obtaining the operation data of the preceding vehicle on the target road section, extracting the operation data to obtain the driving data. Wherein, the target road section refers to the road section that the target vehicle will pass through; that is, at least a part of the road that the target vehicle is traveling on is located in front of the target vehicle. The preceding vehicle refers to the vehicle that has passed through the target road section before.
[0118] Among them, the operating data includes static data and dynamic data of the vehicle. Static data includes: charging, opening the door, playing music, turning on the air conditioner and other data. Dynamic data includes data such as the vehicle's pedal status, vehicle speed, wheel speed, slip rate, and front and rear axle torque distribution coefficients, and also includes status data unrelated to vehicle driving, such as air conditioning data, music data, navigation data, and seat data. The driving data required in this embodiment specifically includes each steering wheel angle and the front and rear axle torque distribution coefficients under each total required torque.
[0119] The vehicle's operating data is collected by each module of the vehicle and converted into a format that can be calculated. The converted data is uploaded to the Internet of Vehicles cloud platform, which extracts and calculates it. The uploaded data is extracted to extract the front and rear axle torque distribution coefficients for each steering wheel angle and each total required torque. The front and rear axle torque distribution coefficients for each steering wheel angle and each total required torque are stored in the database. These data are arranged based on time and location for use in calculation requests for the target vehicle.
[0120] Among them, Figure 2 As shown, step S1 "determining the target front and rear axle torque distribution coefficient of the target vehicle under the target steering wheel angle and the target total required torque in the target section according to the driving data of the previous vehicle in the target section" specifically includes the following detailed steps:
[0121] S11, obtaining n front and rear axle torque distribution coefficients of multiple preceding vehicles under the target steering wheel angle and the target total required torque in the target section; wherein n is a natural number greater than 1; n is specifically the number of times the preceding vehicle passes through the target section and samples the electric torque distribution coefficient, wherein the electric torque distribution coefficient lasts for 500ms and can be recorded as one time; that is, the front axle target motor required torque and the rear axle target motor required torque allocated by the front and rear axle torque distribution coefficient can be recorded as one time only after driving for more than 500ms, and the data is stored. Specifically, the front and rear axle torque distribution coefficients of each steering wheel angle and each total required torque of the preceding vehicle are selected. Specifically, the front and rear axle torque distribution coefficients of the preceding vehicle under each total required torque corresponding to the target steering wheel angle are first selected to obtain the third target group; the front and rear axle torque distribution coefficients corresponding to the target total demand in the third target group are selected; thereby, the n front and rear axle torque distribution coefficients of multiple preceding vehicles under the target steering wheel angle and the target total required torque of the target section are obtained.
[0122] S12, determining an average front and rear axle torque distribution coefficient of a preceding vehicle according to n front and rear axle torque distribution coefficients of the preceding vehicle;
[0123] S13. Determine a target front and rear axle torque distribution coefficient of the target vehicle according to average front and rear axle torque distribution coefficients of a plurality of preceding vehicles.
[0124] By processing the driving data of the preceding vehicle on the target section, wherein the driving data includes multiple groups, it can be ensured that the calculated front and rear axle torque distribution coefficient result of the preceding vehicle is relatively close to the front and rear axle torque distribution coefficient of the target section, thereby making the calculation of the target front and rear axle torque distribution coefficient result relatively accurate, thereby ensuring that the front and rear axle target motor demand torque distribution of the target vehicle is more in line with the target section, making the vehicle driving relatively stable and the steering more suitable, thus making the driving performance better and ensuring the safety and driving experience of the vehicle; in addition, it avoids the intervention of the chassis stability function, which causes the vehicle's drivability to deteriorate.
[0125] Among them, step S12, "determining the average front and rear axle torque distribution coefficient of the preceding vehicle according to the n front and rear axle torque distribution coefficients of the preceding vehicle" specifically includes:
[0126] S a =M1×S1+M2×S2+…+M n ×S n
[0127] M1+M2+……+M n =1
[0128] M1>M2>……>M n
[0129] S a : Average front and rear axle torque distribution coefficient;
[0130] S1, S2, S n : is the front and rear axle torque distribution coefficient of the preceding vehicle in the target section; S1 is closest to the current time, S n Farthest from the present time.
[0131] M: weighted coefficient; the closer the front and rear axle torque distribution coefficient is to the current time in the time dimension, the larger the M value will be. The closer the time is to the current time, the closer it is to the current situation of the target road section; for example, if the target road section has been damaged by rolling, collision, etc. recently, the front and rear axle torque distribution coefficient will change. The closer the time is to the current time, the more it fits the current actual situation;
[0132] Since S1 is closest to the current time, S n Farthest from the present time; therefore, M1>M2>…>M n .
[0133] like Figure 3 As shown, step S13, "determining the target front and rear axle torque distribution coefficient of the target vehicle according to the average front and rear axle torque distribution coefficients of multiple preceding vehicles" specifically includes:
[0134] S131, determining a total average front and rear axle torque distribution coefficient S according to the average front and rear axle torque distribution coefficients of multiple preceding vehicles avg :
[0135] S132. Target front-rear axle torque distribution coefficient = total average front-rear axle torque distribution coefficient = average value of multiple average front-rear axle torque distribution coefficients.
[0136] That is, S 目 =(S a1 +S a2 +…+S aY )÷Y
[0137] S a1 , S a2 , S aY : is the average front and rear axle torque distribution coefficient of multiple preceding vehicles in the target section;
[0138] Y: is the number of preceding vehicles as samples;
[0139] S 目 : Target front and rear axle torque distribution coefficient.
[0140] By making the target front and rear axle torque distribution coefficient equal to the average front and rear axle torque distribution coefficient of multiple preceding vehicles, that is, after dynamically adjusting the target front and rear axle torque distribution coefficient, the target front and rear axle torque distribution coefficient can be more closely fitted to the actual road conditions of the target section, and the target front and rear axle torque distribution coefficient of the target vehicle can be more reasonable, thereby accurately calculating the optimal front and rear axle target motor demand torque suitable for this section, thereby avoiding the intervention of the chassis stability function and causing the vehicle's drivability to deteriorate.
[0141] The specific calculation formula of the target front and rear axle torque distribution coefficient of "determining the target front and rear axle torque distribution coefficient of the target vehicle under the target steering wheel angle and the target total required torque in the target section according to the driving data of the previous vehicle in the target section" in step S1 is as follows:
[0142]
[0143]
[0144] …
[0145]
[0146] M1+M2+……+M n =1
[0147] M1>M2>……>M n
[0148] S avg =(S a1 +S a2 +…+S aY )÷Y
[0149] S 目 =S avg
[0150] M: weighting coefficient;
[0151] is the front and rear axle torque distribution coefficient of the preceding vehicle in the target section; Closest to the present time, The furthest away from the present time.
[0152] Y: is the number of preceding vehicles as samples;
[0153] S a1 , S a2 , S aY: The average front and rear axle torque distribution coefficients of multiple preceding vehicles on the target road section;
[0154] S avg : The total average front and rear axle torque distribution coefficient of multiple preceding vehicles on the target road section
[0155] S 目 : Target front and rear axle torque distribution coefficient.
[0156] The total required torque in step S2 is obtained according to the pedal angle. Specifically, the pedal angle is obtained, and the total required torque is determined according to the pedal angle; the specific calculation method is a commonly used method by those skilled in the art in the prior art, and will not be described in detail in this embodiment.
[0157] Among them, step S2, "determining the front axle target motor required torque and the rear axle target motor required torque of the target vehicle according to the target front and rear axle torque distribution coefficient and the target total required torque" specifically includes:
[0158] Front axle target motor required torque: T1 = T r ×S 目
[0159] Rear axle target motor required torque: T2 = T r ×(1-S 目 )
[0160] T r : Total required torque.
[0161] The front axle motor of the vehicle outputs power according to the front axle target motor required torque, and the rear axle motor outputs power according to the rear axle target motor required torque, which can ensure that the vehicle runs relatively smoothly and the steering is more suitable, which can make the driving performance better and ensure the safety and driving experience of the vehicle; in addition, it avoids the intervention of the chassis stability function, which causes the vehicle's drivability to deteriorate.
[0162] like Figure 4 As shown, the vehicle power control method specifically includes the following detailed steps:
[0163] S001. Acquire the driving data of the preceding vehicle on the target road section;
[0164] S002, obtaining n front and rear axle torque distribution coefficients of each of the plurality of preceding vehicles under the target steering wheel angle and the target total required torque in the target road section; wherein n is a natural number greater than 1;
[0165] S003, determining an average front and rear axle torque distribution coefficient of a preceding vehicle according to n front and rear axle torque distribution coefficients of the preceding vehicle;
[0166] S004. Determine a target front and rear axle torque distribution coefficient of the target vehicle based on average front and rear axle torque distribution coefficients of a plurality of preceding vehicles:
[0167] S005. Determine the front axle target motor torque and the rear axle target motor torque of the target vehicle according to the target front and rear axle torque distribution coefficient and the target total required torque; specifically, the front axle target motor torque: T1 = T r ×S 目 ; Rear axle target motor required torque: T2 = T r ×(1-S 目 )
[0168] S006. The front axle motor of the vehicle outputs power according to the front axle target motor required torque, and the rear axle motor outputs power according to the rear axle target motor required torque.
[0169] Embodiment 2
[0170] This embodiment discloses a vehicle power control method, which is basically the same as the vehicle power control method in the first embodiment, except for the specific steps of step S1.
[0171] The driving data includes the front and rear axle torque distribution coefficients of the preceding vehicle at each steering wheel angle and each total required torque on the target road section.
[0172] like Figure 5 As shown, in this embodiment, step S1 "determining the target front and rear axle torque distribution coefficient of the target vehicle under the target steering wheel angle and the target total required torque in the target section according to the driving data of the previous vehicle in the target section" specifically includes:
[0173] S11. Obtain n front and rear axle torque distribution coefficients of multiple preceding vehicles at each steering wheel angle and each total required torque in the target section; wherein n is a natural number greater than 1; that is, obtain all front and rear axle torque distribution coefficients of the preceding vehicles during driving on the target section.
[0174] S12, determining an average front and rear axle torque distribution coefficient of the preceding vehicle at each steering wheel angle and each total required torque according to n respective front and rear axle torque distribution coefficients of the preceding vehicle at each steering wheel angle and each total required torque;
[0175] Specifically, the average front and rear axle torque distribution coefficient of the preceding vehicle under "steering wheel angle A" and "total required torque B" is:
[0176] S a =M1×S1+M2×S2+…+M n ×S n
[0177] M1+M2+……+M n =1
[0178] M1>M2>……>M n
[0179] S a : Average front and rear axle torque distribution coefficient;
[0180] S1, S2, S n : is the front and rear axle torque distribution coefficient of the preceding vehicle under the “steering wheel angle A” and “total required torque B”; S1 is closest to the current time, S n Farthest from the present time.
[0181] M: weighted coefficient; the closer the front and rear axle torque distribution coefficient is to the current time in the time dimension, the larger the M value will be. The closer the time is to the current time, the closer it is to the current situation of the target road section; for example, if the target road section has been damaged by rolling, collision, etc. recently, the front and rear axle torque distribution coefficient will change. The closer the time is to the current time, the more it fits the current actual situation;
[0182] S13, determining a total average front and rear axle torque distribution coefficient at each steering wheel angle and each total required torque according to average front and rear axle torque distribution coefficients of multiple preceding vehicles at each steering wheel angle and each total required torque;
[0183] The total average front and rear axle torque distribution coefficient under "steering wheel angle A" and "total required torque B":
[0184] S avg =(S a1 +S a2 +…+S aY )÷Y
[0185] S a1 , S a2 , S aY : is the average front and rear axle torque distribution coefficient of multiple preceding vehicles under “steering wheel angle A” and “total required torque B”;
[0186] Y: is the number of preceding vehicles as samples;
[0187] S avg : Total average front and rear axle torque distribution coefficient.
[0188] The specific calculation formula of step S12 and step S13 is as follows: The total average front and rear axle torque distribution coefficient S under the steering wheel angle A" and the "total required torque B" avg :
[0189]
[0190]
[0191] …
[0192]
[0193] M1+M2+……+M n =1
[0194] M1>M2>……>M n
[0195] S avg =(S1+S2+…+S Y )÷Y
[0196] M: weighting coefficient; weighting coefficient; the closer the front and rear axle torque distribution coefficient is to the current time in the time dimension, the larger the M value will be. The closer the time is to the current time, the closer it is to the current situation of the target road section; for example, when the target road section has been damaged by rolling, collision, etc. recently, the front and rear axle torque distribution coefficient will change. The closer the time is to the current time, the more it fits the current actual situation;
[0197] is the front and rear axle torque distribution coefficient of the preceding vehicle under the “steering wheel angle A” and “total required torque B” in the target section;
[0198] Y: is the number of preceding vehicles as samples;
[0199] S1, S2, S Y : is the average front and rear axle torque distribution coefficient of multiple preceding vehicles under the “steering wheel angle A” and “total required torque B” in the target section;
[0200] S avg : The total average front and rear axle torque distribution coefficient of the preceding vehicle under the “steering wheel angle A” and “total required torque B” of the target section;
[0201] Steering wheel angle range: C~0(deg)~E
[0202] The total required torque range is: D~0Nm~F
[0203] The calculated total average front and rear axle torque distribution coefficients at various steering wheel angles and total required torques are shown in Table 1.
[0204] Table 1
[0205] S14. Determine the target front and rear axle torque distribution coefficient of the target vehicle at the target steering wheel angle and the target total required torque according to the total average front and rear axle torque distribution coefficient at each steering wheel angle and each total required torque. The specific coefficient is selected from Table 1.
[0206] like Figure 6 As shown, step S14 specifically includes the following detailed steps:
[0207] S1411, selecting a plurality of total average front and rear axle torque distribution coefficients having the same steering wheel angle as the target steering wheel angle, to obtain a first target group;
[0208] S1412: Select the total average front and rear axle torque distribution coefficient corresponding to the target total required torque in the first target group to obtain the target total average front and rear axle torque distribution coefficient S 目标avg ;
[0209] S1413, assigning the target total average front and rear axle torque distribution coefficient to the target front and rear axle torque distribution coefficient. 目 =S 目标avg
[0210] It should be noted that the specific steps of step S14 are not intended to limit the present invention. Without departing from the principles of the present invention, in other embodiments, step S13 may also include other specific steps, which do not depart from the basic principles of the present invention and fall within the protection scope of the present invention. Figure 7 As shown, step S14 specifically includes the following detailed steps:
[0211] S1421, selecting a plurality of total average front and rear axle torque distribution coefficients having the same steering wheel angle as the target total required torque to obtain a second target group;
[0212] S1422, selecting the total average front and rear axle torque distribution coefficient corresponding to the target steering wheel angle in the target group to obtain the target total average front and rear axle torque distribution coefficient S 目标avg ;
[0213] S1423, assign the target total average front and rear axle torque distribution coefficient to the target front and rear axle torque distribution coefficient. 目 =S 目标avg
[0214] Embodiment 3
[0215] This embodiment discloses a vehicle power control system, which includes a vehicle networking cloud platform, a preceding vehicle and a target vehicle.
[0216] Both the preceding vehicle and the target vehicle are connected to the Internet of Vehicles cloud platform, and can transmit the generated data to the cloud platform, and can also receive data from the cloud platform to control the vehicle.
[0217] When the preceding vehicle passes through the target road section, it generates operating data, which is transmitted to the cloud platform. The cloud platform then separates and processes the data, extracts and stores the data related to the calculation of the target electric power torque distribution coefficient.
[0218] Since vehicles are often parked in underground parking garages or driven to places with poor signals such as rural roads, the communication between the vehicle and the cloud platform may be interrupted. A storage module is added to the Internet of Vehicles module to store vehicle operation data when it is unable to communicate with the cloud platform, and upload the data as a whole after reconnection. In other words, in the event of a communication failure, the vehicle can temporarily store the data and then upload it to the cloud platform after communication is established.
[0219] When the target vehicle is about to pass the target road section and sends a request to the cloud platform, the cloud platform executes step S1, that is, the cloud platform calculates the target front and rear axle torque distribution coefficient according to the driving data. Specifically, the cloud platform calculates the front and rear axle torque distribution coefficient of the previous vehicle on the target road section according to the above formula to obtain the total average front and rear axle torque distribution coefficient, and then obtains the target front and rear axle torque distribution coefficient.
[0220] The target front and rear axle torque distribution coefficient is calculated by the Internet of Vehicles cloud platform. The cloud platform has strong computing power and can quickly calculate the target front and rear axle torque distribution coefficient, and then the target vehicle performs electro-hydraulic torque distribution. By calculating the target front and rear axle torque distribution coefficient through the cloud platform, the target vehicle can quickly respond to the road conditions of the target section and match the target vehicle with the target section.
[0221] In addition, step S0 is also executed by the cloud platform. Since the cloud platform has powerful computing power and can obtain the operating data of the preceding vehicle, it can quickly filter the operating data and obtain the front and rear axle torque distribution coefficient of the preceding vehicle on the target section.
[0222] After the cloud platform calculates the target front and rear axle torque distribution coefficient, the target vehicle calculates the front axle target motor demand torque and the rear axle target motor demand torque of the target vehicle based on the target front and rear axle torque distribution coefficient and the target total demand torque. Specifically, the vehicle's ECU first calculates the target total demand torque, and then calculates based on the target front and rear axle torque distribution coefficient transmitted from the cloud platform to obtain the front axle target motor demand torque and the rear axle target motor demand torque. The vehicle's front axle motor outputs power according to the front axle target motor demand torque, and the rear axle motor outputs power according to the rear axle target motor demand torque.
[0223] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.
Claims
1. A vehicle power control method, characterized in that: The steps include: Determining a target front and rear axle torque distribution coefficient of the target vehicle under a target steering wheel angle and a target total required torque in the target section according to the driving data of the preceding vehicle in the target section; According to the target front-rear axle torque distribution coefficient and the target total required torque, a front axle target motor required torque and a rear axle target motor required torque of the target vehicle are determined.
2. The vehicle power control method according to claim 1, characterized in that: The vehicle power control method is before the step of "determining the target front and rear axle torque distribution coefficient of the target vehicle under the target steering wheel angle and the target total required torque in the target section according to the driving data of the preceding vehicle in the target section"; The control method further comprises: The operation data of the preceding vehicle on the target road section is acquired, and the operation data is extracted to obtain the driving data.
3. The vehicle power control method according to claim 1, characterized in that: The driving data includes the target steering wheel angle and the front and rear axle torque distribution coefficient of the preceding vehicle in the target road section under the target total required torque; “Determining, based on the driving data of the preceding vehicle on the target road section, a target front and rear axle torque distribution coefficient of the target vehicle under a target steering wheel angle and a target total required torque on the target road section” includes: Obtaining n front and rear axle torque distribution coefficients of each of the plurality of preceding vehicles under the target steering wheel angle and the target total required torque in the target road section; wherein n is a natural number greater than 1; Determining an average front-rear-axle torque distribution coefficient of the preceding vehicle according to the n front-rear-axle torque distribution coefficients of the preceding vehicle; The target front-rear-axle torque distribution coefficient of the target vehicle is determined according to the average front-rear-axle torque distribution coefficient of the plurality of preceding vehicles.
4. The vehicle power control method according to claim 3, characterized in that: “Determining the average front and rear axle torque distribution coefficient of the preceding vehicle based on the n front and rear axle torque distribution coefficients of the preceding vehicle” includes: S a =M1×S1+M2×S2+…+M n ×S n M1+M2+……+M n =1 M1>M2>……>M n S a : Average front and rear axle torque distribution coefficient; S1, S2, S n : is the front and rear axle torque distribution coefficient of the preceding vehicle in the target section; M: weighting coefficient; the shorter the front and rear axle torque distribution coefficient is from the current time in the time dimension, the larger the value of M.
5. The vehicle power control method according to claim 4, characterized in that: “Determining the target front and rear axle torque distribution coefficient of the target vehicle based on the average front and rear axle torque distribution coefficients of the plurality of preceding vehicles” includes: S 目 =(S a1 +S a2 +…+S aY )÷Y S a1 , S a2 , S aY : is the average front and rear axle torque distribution coefficient of the plurality of preceding vehicles in the target road section; Y: is the number of preceding vehicles; S 目 : Target front and rear axle torque distribution coefficient.
6. The vehicle power control method according to claim 1, characterized in that: The driving data includes front and rear axle torque distribution coefficients of the preceding vehicle at each steering wheel angle and each total required torque in the target road section; “Determining, based on the driving data of the preceding vehicle on the target road section, a target front and rear axle torque distribution coefficient of the target vehicle under a target steering wheel angle and a target total required torque on the target road section” includes: Obtaining n front and rear axle torque distribution coefficients of each of the preceding vehicles at each steering wheel angle and each total required torque in the target road section; wherein n is a natural number greater than 1; Determining an average front and rear axle torque distribution coefficient of the preceding vehicle at each steering wheel angle and each total required torque according to the respective n front and rear axle torque distribution coefficients of the preceding vehicle at each steering wheel angle and each total required torque; Determining a total average front-rear-axle torque distribution coefficient at each steering wheel angle and each total required torque according to the average front-rear-axle torque distribution coefficient of the plurality of preceding vehicles at each steering wheel angle and each total required torque; According to the total average front and rear axle torque distribution coefficients at each steering wheel angle and each total required torque, the target front and rear axle torque distribution coefficients of the target vehicle at the target steering wheel angle and the target total required torque are determined.
7. The vehicle power control method according to claim 6, characterized in that: “Determining the target front and rear axle torque distribution coefficient of the target vehicle at the target steering wheel angle and the target total required torque according to the total average front and rear axle torque distribution coefficient at each steering wheel angle and each total required torque” includes: Selecting a plurality of total average front and rear axle torque distribution coefficients having the same steering wheel angle as the target steering wheel angle to obtain a first target group; Selecting the total average front and rear axle torque distribution coefficient corresponding to the target total required torque in the first target group to obtain a target total average front and rear axle torque distribution coefficient; The target total average front-rear axle torque distribution coefficient is assigned to the target front-rear axle torque distribution coefficient.
8. The vehicle power control method according to claim 6, characterized in that: “Determining the target front and rear axle torque distribution coefficient of the target vehicle at the target steering wheel angle and the target total required torque according to the total average front and rear axle torque distribution coefficient at each steering wheel angle and each total required torque” includes: Selecting a plurality of total average front and rear axle torque distribution coefficients having the same steering wheel angle as the target total required torque to obtain a second target group; Selecting the total average front and rear axle torque distribution coefficient corresponding to the target steering wheel angle in the target group to obtain a target total average front and rear axle torque distribution coefficient; The target total average front-rear axle torque distribution coefficient is assigned to the target front-rear axle torque distribution coefficient.
9. The vehicle power control method according to any one of claims 5 to 8, characterized in that: “Determining the front axle target motor required torque and the rear axle target motor required torque of the target vehicle according to the target front and rear axle torque distribution coefficient and the target total required torque” includes: Front axle target motor required torque: T1 = T r ×S 目 Rear axle target motor required torque: T2 = T r ×(1-S 目 ) T r : Target total required torque; S 目 : Target front and rear axle torque distribution coefficient.
10. A vehicle power control system, characterized in that: It is configured to be able to execute the vehicle power control method as claimed in any one of claims 1-9.