CN-121977859-A - Method, device, equipment and medium for determining torque distribution ratio of front and rear shaft motor

CN121977859ACN 121977859 ACN121977859 ACN 121977859ACN-121977859-A

Abstract

The application relates to a method, a device, equipment and a medium for determining the torque distribution ratio of a front and a rear shaft motor, wherein the method comprises the steps of interpolating and encrypting original Map diagrams of the efficiency of the front and the rear motors to obtain encrypted Map diagrams of the front and the rear motors; the method comprises the steps of determining a target optimizing range of a rear motor torque value according to a total required torque value and a rear motor torque value boundary value under a current working condition, traversing the rear motor torque value in the target optimizing range, determining a front motor torque value to generate a torque distribution combination, determining front motor efficiency values and rear motor efficiency values corresponding to the torque distribution combination in a front motor encryption Map and a rear motor encryption Map, substituting the front motor torque value, the rear motor torque value, the front motor efficiency value and the rear motor efficiency value into a total efficiency calculation formula to obtain total efficiency values corresponding to each torque distribution combination, and determining the torque distribution combination corresponding to the maximum value in each total efficiency value as an optimal torque distribution ratio. The problem of the not high accuracy of calibration result because can't measure and determine optimal torque distribution ratio accurately is solved.

Inventors

LI WENYANG
ZHAO CHANGXIN
KUANG YUANHONG
PING JIN
ZHANG RUIHUI
YUAN CHENGGUO
CHENG XIAOLONG

Assignees

重庆蓝电汽车科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260407

Claims (10)

1. A method of determining a front-to-rear axle motor torque split ratio, comprising: Measuring and obtaining a front motor efficiency original Map image and a rear motor efficiency original Map image, and respectively carrying out interpolation encryption on sparse dimensions in the front motor efficiency original Map image and the rear motor efficiency original Map image to obtain a front motor encryption Map image and a rear motor encryption Map image; Acquiring a total required torque value under the current vehicle state, and identifying a current working condition according to the total required torque value; acquiring a rear motor torque value boundary value under the current working condition, and determining a target optimizing range of the rear motor torque value under the current working condition according to the total required torque value and the rear motor torque value boundary value; Traversing the rear motor torque value in the target optimizing range, and determining a front motor torque value according to the difference value between the total required torque value and the rear motor torque value to generate each torque distribution combination; determining a front motor efficiency value corresponding to each of the torque distribution combinations in the front motor encryption Map, and determining a rear motor efficiency value corresponding to each of the torque distribution combinations in the rear motor encryption Map; Reading a total efficiency calculation formula corresponding to the current working condition, and substituting the rear motor torque value, the front motor efficiency value and the rear motor efficiency value into the total efficiency calculation formula to obtain total efficiency values corresponding to the torque distribution combinations; And determining a maximum value in the total efficiency values of the torque distribution combinations, and determining the torque distribution combination corresponding to the maximum value as an optimal torque distribution ratio.
2. The method according to claim 1, wherein interpolating the sparse dimensions in the front motor efficiency raw Map and the rear motor efficiency raw Map to obtain a front motor encryption Map and a rear motor encryption Map, respectively, comprises obtaining the front motor encryption Map in the following manner: Acquiring rotating speed coordinate axis data in the original Map graph of the front motor efficiency, and determining the rotating speed coordinate axis data as the sparse dimension; performing one-dimensional linear interpolation operation on the original rotating speed data points in the sparse dimension to generate a front motor encryption rotating speed sequence; And carrying out grid encryption on the original Map graph of the front motor efficiency according to the encryption rotating speed sequence of the front motor to obtain the encryption Map graph of the front motor.
3. The method of claim 1, wherein the obtaining the post-motor torque value boundary value under the current operating condition and determining the target optimizing range of the post-motor torque value under the current operating condition according to the total required torque value and the post-motor torque value boundary value comprises: if the current working condition is a recovery working condition, taking the minimum available torque value of the rear motor as the boundary value of the torque value of the rear motor; judging whether the boundary value of the torque value of the rear motor is larger than the total required torque value or not; Setting the boundary value of the rear motor torque value as a traversing starting point and a preset value as a traversing end point if the boundary value of the rear motor torque value is larger than the total required torque value, setting the total required torque value as the traversing starting point and the preset value as the traversing end point if the boundary value of the rear motor torque value is smaller than or equal to the total required torque value; and determining a continuous interval from the traversal starting point to the traversal ending point as the target optimizing range of the rear motor torque value under the recovery working condition, wherein the traversal direction is gradually decreased from the traversal starting point to the traversal ending point.
4. The method of claim 1, wherein the obtaining the post-motor torque value boundary value under the current operating condition and determining the target optimizing range of the post-motor torque value under the current operating condition according to the total required torque value and the post-motor torque value boundary value comprises: if the current working condition is a driving working condition, taking the maximum available torque value of the rear motor as the boundary value of the torque value of the rear motor; Judging whether the boundary value of the torque value of the rear motor is smaller than the total required torque value; Setting a preset value as a traversal starting point and a rear motor torque value boundary value as a traversal end point if the rear motor torque value boundary value is smaller than the total required torque value, setting the preset value as the traversal starting point and the total required torque value as the traversal end point if the rear motor torque value boundary value is larger than or equal to the total required torque value; And determining a continuous interval from the traversal starting point to the traversal ending point as the target optimizing range of the rear motor torque value under the driving working condition, wherein the traversal direction increases from the traversal starting point to the traversal ending point.
5. The method of claim 1, wherein traversing the rear motor torque values within the target optimization range and determining a front motor torque value based on a difference between the total requested torque value and the rear motor torque value to generate each torque distribution combination comprises: reading a preset step value; sequentially selecting a rear motor torque value sampling value along a target direction according to the preset step value from the traversal starting point of the target optimizing range, wherein the target direction is determined by the current working condition; after each time of selecting the rear motor torque value sampling value, judging whether the current target rear motor torque value sampling value reaches the traversing end point of the target optimizing range; calculating the difference value between the total required torque value and the target post-motor torque value sampling value under the condition that the target post-motor torque value sampling value does not reach the traversing end point; Determining the difference value as a front motor torque value corresponding to the target rear motor torque value sampling value; and combining the target rear motor torque value sampling value with the front motor torque value to obtain the torque distribution combination.
6. The method of claim 1, wherein said determining a front motor efficiency value in said front motor encryption Map corresponding to each of said torque distribution combinations comprises determining said front motor efficiency value corresponding to a current torque distribution combination by: Reading the front motor torque value from the current torque distribution combination, and reading a motor rotating speed value in the current vehicle state; the front motor torque value and the motor rotating speed value are used as input parameters and are input into the front motor encryption Map; And executing two-dimensional linear interpolation operation in the front motor encryption Map graph to acquire the front motor efficiency value output by the front motor encryption Map graph.
7. The method of claim 1, wherein the reading the total efficiency calculation formula corresponding to the current operating condition comprises: If the current working condition is a recovery working condition, reading a first total efficiency calculation formula corresponding to the recovery working condition, wherein the first total efficiency calculation formula is as follows: , Wherein, the Representing the value of the total required torque, Representing the value of the torque of the front motor, Representing the torque value of the rear motor, Representing the value of the efficiency of the front motor, Representing the rear motor efficiency value; if the current working condition is a driving working condition, reading a second total efficiency calculation formula corresponding to the driving working condition, wherein the second total efficiency calculation formula is as follows: 。
8. a device for determining a torque distribution ratio of a front and rear shaft motor, comprising: The acquisition module is used for measuring and acquiring a front motor efficiency original Map image and a rear motor efficiency original Map image, and respectively carrying out interpolation encryption on sparse dimensions in the front motor efficiency original Map image and the rear motor efficiency original Map image to obtain a front motor encryption Map image and a rear motor encryption Map image; the identifying module is used for acquiring a total required torque value in the current vehicle state and identifying the current working condition according to the total required torque value; The first determining module is used for obtaining a rear motor torque value boundary value under the current working condition and determining a target optimizing range of the rear motor torque value under the current working condition according to the total required torque value and the rear motor torque value boundary value; The generation module is used for traversing the rear motor torque value in the target optimizing range, and determining a front motor torque value according to the difference value between the total required torque value and the rear motor torque value so as to generate each torque distribution combination; The second determining module is used for determining a front motor efficiency value corresponding to each torque distribution combination in the front motor encryption Map and determining a rear motor efficiency value corresponding to each torque distribution combination in the rear motor encryption Map; The calculation module is used for reading a total efficiency calculation formula corresponding to the current working condition, substituting the rear motor torque value, the front motor efficiency value and the rear motor efficiency value into the total efficiency calculation formula to obtain total efficiency values corresponding to the torque distribution combinations; and the third determining module is used for determining a maximum value in the total efficiency values of the torque distribution combinations and determining the torque distribution combination corresponding to the maximum value as an optimal torque distribution ratio.
9. An electronic device comprising a memory, a processor, a communication interface and a communication bus, said memory storing a computer program executable on said processor, said memory, said processor communicating with said communication interface via said communication bus, characterized in that said processor, when executing said computer program, implements the steps of the method according to any of the preceding claims 1 to 7.
10. A computer readable medium having non-volatile program code executable by a processor, the program code causing the processor to perform the method of any one of claims 1 to 7.

Description

Method, device, equipment and medium for determining torque distribution ratio of front and rear shaft motor Technical Field The application relates to the technical field of measurement, in particular to a method, a device, equipment and a medium for determining a torque distribution ratio of a front shaft motor and a rear shaft motor. Background In the power economy calibration process of the new energy electric automobile, the optimization of front and rear axle double-motor torque distribution is a key link for improving the energy utilization efficiency of the whole automobile. The current mainstream method relies on Map diagrams of front and rear motor efficiency obtained by bench test, and a calibration engineer needs to find an optimal torque distribution ratio under the condition of given total required torque and vehicle speed, so that the comprehensive efficiency of the front and rear motors is maximized. However, since the Map of motor efficiency is typically discrete data points, the actual calibration operating points often do not fall exactly on these discrete points, making it difficult to accurately measure the motor efficiency value under the corresponding operating conditions. At present, the torque distribution ratio is usually determined by manual estimation or empirical judgment, and the method is low in efficiency, has large human errors and is difficult to ensure the accuracy and reliability of a calibration result. Therefore, aiming at the problem that the accuracy of the calibration result is not high due to the fact that the optimal torque distribution ratio cannot be accurately measured and determined at present, a method capable of automatically and accurately determining the optimal distribution ratio of the front motor torque and the back motor torque is needed, and therefore the calibration result is guided to be improved. Disclosure of Invention The application provides a method, a device, equipment and a medium for determining torque distribution ratios of front and rear shaft motors, which are used for solving the technical problem that the accuracy of a calibration result is low because the optimal torque distribution ratio cannot be accurately measured and determined. According to one aspect of the embodiment of the application, the method for determining the torque distribution ratio of the front and rear shaft motors comprises the steps of measuring and obtaining a front motor efficiency original Map and a rear motor efficiency original Map, respectively carrying out interpolation encryption on sparse dimensions in the front motor efficiency original Map and the rear motor efficiency original Map to obtain a front motor encryption Map and a rear motor encryption Map, obtaining a total demand torque value in a current vehicle state, identifying a current working condition according to the total demand torque value, obtaining a rear motor torque value boundary value in the current working condition, determining a target optimizing range of the rear motor torque value in the current working condition according to the total demand torque value and the rear motor torque value boundary value, traversing the rear motor torque value in the target optimizing range, determining a front motor torque value according to a difference value between the total demand torque value and the rear motor torque value, so as to generate each torque distribution combination, determining a front motor efficiency value corresponding to each torque distribution combination in the front motor encryption Map, determining a rear motor efficiency value corresponding to each torque distribution combination in the rear motor encryption Map, reading the total demand torque value corresponding to each torque efficiency value, calculating the total efficiency value corresponding to each torque distribution maximum value in the total demand torque distribution formula, and calculating the total efficiency value corresponding to each torque distribution maximum value, and substituting the total efficiency value into the total efficiency value in the total torque distribution formula, and determining the total efficiency value corresponding to the total efficiency distribution maximum value. The method comprises the steps of obtaining rotating speed coordinate axis data in a front motor efficiency original Map image, determining the rotating speed coordinate axis data as sparse dimension, performing one-dimensional linear interpolation operation on original rotating speed data points in the sparse dimension to generate a front motor encryption rotating speed sequence, and conducting grid encryption on the front motor efficiency original Map image according to the front motor encryption rotating speed sequence to obtain the front motor encryption Map image. The method comprises the steps of obtaining a rear motor torque value boundary value under a current working condition, determining a target optimizing ra