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An online real-time torque optimal allocation control method for distributed drive electric vehicles

A technology for optimizing distribution of electric vehicles, applied in the direction of electric vehicles, control drives, control devices, etc., can solve problems such as large deviations, achieve the effects of meeting vehicle operation requirements, reducing system power consumption, and improving overall drive efficiency

Active Publication Date: 2018-02-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the existing electric vehicle torque optimization distribution control method is based on a model, adopts an off-line optimization method, requires a large amount of characteristic test data of motor efficiency, and has a large deviation from the actual situation, and proposes a method An online real-time torque optimal distribution control method for distributed drive electric vehicles

Method used

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  • An online real-time torque optimal allocation control method for distributed drive electric vehicles
  • An online real-time torque optimal allocation control method for distributed drive electric vehicles
  • An online real-time torque optimal allocation control method for distributed drive electric vehicles

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specific Embodiment approach 1

[0022] Specific implementation mode 1. Combination figure 1 and figure 2 Describe this embodiment, a distributed drive electric vehicle online real-time torque optimal allocation control method described in this embodiment, the method is realized based on the distributed drive electric vehicle online real-time torque optimal distribution control device, the device includes four Drive motor, four drive motor controllers, power battery pack 5 and vehicle controller 6;

[0023] The four drive motors are: front right wheel drive motor 1-1, rear right wheel drive motor 2-1, front left wheel drive motor 3-1 and rear left wheel drive motor 4-1;

[0024] The four drive motor controllers are: front right wheel motor controller 1-2, rear right wheel motor controller 2-2, front left wheel motor controller 3-2 and rear left wheel motor controller 4-2;

[0025] The drive signal input state signal output end of the front right wheel drive motor 1-1 is connected to the drive signal output...

specific Embodiment approach 2

[0036] Specific embodiment two, combine image 3Describe this embodiment. This embodiment is a further description of a distributed drive electric vehicle online real-time torque optimization distribution control method described in the first specific embodiment. The real-time total demand torque of the motor and the external characteristics of the motor torque use the golden ratio search algorithm to calculate the optimal distribution coefficient of the torque of the four driving motors of the electric vehicle in real time; the specific steps are:

[0037] Step 31. Calculate the real-time target total torque Ttotal of the distributed drive electric vehicle according to the real-time speed signal of the electric vehicle and the analog signal of the accelerator pedal opening;

[0038] Step 32: Set the torque optimization distribution coefficient k, k is the ratio of the front axle motor torque to the real-time target total torque Ttotal, the initialization search interval of k ...

specific Embodiment approach 3

[0049] Specific embodiment 3. This embodiment is a further description of the online real-time torque optimization distribution control method for distributed drive electric vehicles described in specific embodiment 1. Steps 3 and 5 are based on the input total power and output total The concrete method of calculating the real-time total efficiency value η1=η(k1) when the torque distribution coefficient k=k1 and the real-time total efficiency value η2=η(k2) when the torque distribution coefficient k=k1 is as follows:

[0050] By formula:

[0051]

[0052] Calculate and obtain the real-time efficiency η of the front right wheel drive motor 1-1 1_1 (i), where P in,1 (i) is the input power of the front right wheel drive motor at time i, P out,1 (i) is the output power of the front right wheel drive motor at time i, U 1 (i) is driving front right wheel motor controller 1-2 input terminal bus voltage at i moment, I 1 (i) is the bus current at the input end of the front right...

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Abstract

The invention relates to an on-line real-time torque optimal distribution control method of a distributed driving electric automobile, belongs to the technical field of torque optimal distribution control of an electric automobile, and solves the problems that conventional electric automobile torque optimal distribution control methods are based on models, and are optimized in an off-line manner, so that massive characteristic testing data of electrical efficiency is required, and large deviation exists with the actual situation. The on-line real-time torque optimal distribution control method is realized based on an on-line real-time torque optimal distribution control device of the distributed driving electric automobile, and comprises the following steps of collecting the real-time speed of the electric automobile, rotating speeds of four driving motors and opening analog quantity signals of an accelerator pedal of the electric automobile; calculating real-time total demand torque of the four driving motors when the electric automobile travels; and then calculating an optimal distribution coefficient of the torque when the total efficiency of the four driving motors of the electric automobile is optimal, and separately controlling four control motors to output the torque to four driving motor controllers. The on-line real-time torque optimal distribution control method disclosed by the invention is suitable for on-line real-time torque optimal distribution control.

Description

technical field [0001] The invention belongs to the technical field of torque optimal distribution control of electric vehicles. Background technique [0002] Distributed drive is considered to be an advanced technology for the power system of electric vehicles in the future, and it has great potential for development in terms of power and economy. Because of its high degree of freedom in system control, strong system operation stability, and high energy-saving potential, it has been widely concerned all over the world. Due to the existence of multiple drive units, how to realize the torque optimization control of the system is the focus of research. The control method of rationally allocating the total demand torque of the system to each drive motor is studied to achieve the optimal system efficiency and play multiple roles at the same time. It is of great significance to take advantage of the advantages of the motor drive system to achieve high power performance and impro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L15/20B60L15/32
CPCB60L15/20B60L15/32B60L2240/12B60L2240/421B60L2240/423Y02T10/72
Inventor 杜玖玉欧阳明高高明明李建秋马良峰
Owner TSINGHUA UNIV
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