Power distribution method and device for four-wheel drive electric vehicle

A power distribution and electric vehicle technology, applied in the field of vehicles, can solve the problems of low efficiency of the motor system of four-wheel drive electric vehicles, and achieve the effect of improving the efficiency of the motor system, rational distribution, reducing energy consumption and adverse effects of battery life

Inactive Publication Date: 2020-12-01
EVERGRANDE NEW ENERGY AUTOMOTIVE INVESTMENT HLDG GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This specification provides a power distribution method and device for a four-wheel drive electric vehicle, which is used to solve the problem of low efficiency of the motor system of the four-wheel drive electric vehicle caused by the existing torque distribution method

Method used

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  • Power distribution method and device for four-wheel drive electric vehicle
  • Power distribution method and device for four-wheel drive electric vehicle
  • Power distribution method and device for four-wheel drive electric vehicle

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Experimental program
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Embodiment 1

[0037] Based on the above application scenario architecture, figure 2 Schematic flow chart of the power distribution method for four-wheel drive electric vehicles provided in the embodiment of this specification Figure 1 , figure 2 methods in figure 1The vehicle controller in the vehicle is executed, and at least two motors are installed on the four-wheel drive electric vehicle, such as figure 2 As shown, the method includes the following steps:

[0038] S102, during the running of the vehicle, acquire the torque required by the driver to operate the vehicle and the real-time rotational speed of the motor.

[0039] Among them, the demanded torque of the driver to operate the vehicle reflects the driver's driving intention to the vehicle, which can be obtained by analyzing the driver's operation behavior on the vehicle and the running state of the vehicle itself.

[0040] For example, during the operation of the vehicle, the operation signal of the driver's operation of...

Embodiment 2

[0056] This embodiment is on the basis of embodiment one, to figure 2 The power distribution method of the four-wheel drive electric vehicle shown is expanded and supplemented.

[0057] In a specific embodiment, the loss power when the above-mentioned motor generates torque may include: the output power loss when the motor is in a working state and generates output torque; correspondingly, as image 3 As shown, step S106 may include:

[0058] S106-2, according to the torque and the value of the demand torque, from the obtained output torque corresponding to each motor, arbitrarily select an output torque for combination, and calculate the output loss power and value corresponding to each torque combination.

[0059] Among them, the output torque is defined as the torque actively output by the motor in the working state. According to the direction of the motor output torque, the output torque can be divided into positive and negative output torques; the process of the motor o...

example 1

[0089] Example 1: T d = 200, when n = 200, the power loss of the front and rear motors under different torque distribution methods is calculated by linear interpolation, and the total power loss table is obtained by summing as follows:

[0090] Table 4 Total Power Loss Table

[0091] T d

[0092] It can be seen from the table that under this working condition, when the rear motor does not work (that is, enters the dragging working condition), the total power loss is the smallest when the front motor outputs 206Nm.

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Abstract

The embodiment of the invention provides a power distribution method and device for a four-wheel drive electric vehicle. At least two motors are installed on the four-wheel drive electric vehicle. Themethod comprises the steps: during vehicle running, acquiring the required torque of a driver for operating a vehicle and the real-time rotating speed of a motor; acquiring loss power of the corresponding motor when the corresponding motor generates different torques at the real-time rotating speed from the loss power table corresponding to each motor; taking the torque sum value as the requiredtorque, randomly selecting one torque from the acquired torques corresponding to each motor for combination, and calculating the loss power sum value corresponding to each torque combination; according to the loss power sum value corresponding to each torque combination, determining the torque distribution proportion of the required torque in the at least two motors, so that the power loss sum value corresponding to the determined torque distribution proportion meets a preset requirement. Therefore, the problem of low motor system efficiency of the four-wheel drive electric vehicle caused byan existing torque distribution mode is solved.

Description

technical field [0001] This document relates to the field of vehicle technology, in particular to a power distribution method and device for a four-wheel drive electric vehicle. Background technique [0002] At present, the power distribution method of four-wheel drive electric vehicles is: after the vehicle controller (VCU) analyzes the driver's demand torque, it is simply distributed to the motors on the vehicle through equal proportions or other empirical proportions. Conventional four-wheel drive electric vehicles will Install two motors, the front and rear motors. The front and rear motors adjust the output torque according to the VCU command. This torque distribution method will lead to low efficiency of the motor system, thereby adversely affecting the energy consumption and battery life of the vehicle. Contents of the invention [0003] This specification provides a power distribution method and device for a four-wheel drive electric vehicle, which are used to so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L15/32B60W30/18
CPCB60L15/32B60W30/18B60L2240/423B60W2710/083Y02T10/64
Inventor 范良明
Owner EVERGRANDE NEW ENERGY AUTOMOTIVE INVESTMENT HLDG GRP CO LTD
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