A torque optimization distribution control method for distributed drive electric vehicles

A technology for electric vehicles and optimized distribution, applied in electric vehicles, control drives, control devices, etc., can solve the problems of poor stability and tire wear of electric vehicles, and achieve the effect of ensuring stability and reducing wear and tear.

Active Publication Date: 2018-07-06
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problems of tire wear and poor running stability of electric vehicles in existing four-wheel drive and other distributed drive electric vehicle torque distribution methods, and proposes a distributed drive electric vehicle torque optimization distribution control method

Method used

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  • A torque optimization distribution control method for distributed drive electric vehicles
  • A torque optimization distribution control method for distributed drive electric vehicles
  • A torque optimization distribution control method for distributed drive electric vehicles

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Experimental program
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specific Embodiment approach 1

[0013] Specific implementation mode 1. Combination figure 1 Describe this embodiment, a kind of distributed drive electric vehicle torque optimal distribution control method described in this embodiment, the specific steps of this method are:

[0014] Step 1. Use the pressure sensor 7 to detect the tire vertical load, use the vehicle speed sensor 8 to detect the tire lateral velocity, and use the rotational speed sensor 9 to detect the tire rotational speed; send the collected tire vertical load, tire lateral velocity and tire rotational speed to the vehicle controller 6;

[0015] Step 2, the vehicle controller 6 uses the collected tire vertical load, tire lateral velocity and tire rotational speed to calculate the relevant parameters and tire wear work of the electric vehicle during operation;

[0016] The relevant parameters include: the slip rate of each tire of the electric vehicle, the rotational speed of each tire of the electric vehicle, the lateral velocity of each tir...

specific Embodiment approach 2

[0019] Specific embodiment 2. This embodiment is a further description of a distributed drive electric vehicle torque optimization distribution control method described in specific embodiment 1. The slip ratio of each tire of the electric vehicle described in step 2 The method of obtaining is: using the rotation speed sensor to detect the tire rotation speed, and the speed sensor to detect the tire lateral speed. The specific method is to use the formula:

[0020]

[0021] obtained, where s is the slip rate, ω is the tire rotational speed, R is the effective rolling radius of the tire, and V is the longitudinal velocity of the tire.

specific Embodiment approach 3

[0022] Specific embodiment 3. This embodiment is a further description of a distributed drive electric vehicle torque optimization distribution control method described in specific embodiment 1. The friction suffered by each tire in the longitudinal direction described in step 2 The specific method of force is through the formula:

[0023] f x =K·F z s (2)

[0024] obtained, where F x is the frictional force on the tire in the longitudinal direction, F z is the vertical load borne by the tire, and K is the friction coefficient of the tire material.

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Abstract

The invention provides a torque optimal distribution control method for a distributed drive electric automobile and relates to a torque distribution control method for the distributed drive electric automobile. The problems that in the torque distribution manner of an existing distributed drive electric automobile under four-wheel drive and the like, tires are worn, and the running stability of the electric automobile is poor are solved. By the adoption of the torque optimal distribution control method, pressure sensors are adopted for detecting the vertical loads of tires, automobile speed sensors are adopted for detecting the transverse speeds of the tires, and rotation speed sensors are adopted for detecting the rotation speeds of the tires; signals are sent to a whole automobile controller; the whole automobile controller calculates related parameters and the tire wear power in the running process of the electric automobile according to the received signals; the obtained related parameters and the tire wear power are used for calculating the torque of four drive motors of the electric automobile, and when the tire wear power is minimum, an objective function for torque distribution control of the four motors is obtained; and according to restraint conditions, drive torque functions of the four motors are obtained. The method is suitable for torque distribution control for the distributed drive electric automobile.

Description

technical field [0001] The invention relates to a torque distribution control method of a distributed drive electric vehicle. Background technique [0002] Torque distribution is one of the key technologies for distributed drive electric vehicles such as four-wheel drive. Different torque distribution strategies have a great impact on the performance of various power batteries, such as energy efficiency, running stability and tire wear. At present, the main research is mainly on the torque optimization control with the goal of stable control. However, the torque distribution methods of existing four-wheel drive and other distributed drive electric vehicles all have a great influence on tire wear and poor stability, and tire wear is one of the important sources of PM10 contributed by motor vehicles in the air. Contents of the invention [0003] The present invention aims to solve the problems of tire wear and poor running stability of electric vehicles in existing four-whe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L15/28B60L15/38
CPCB60L15/2045B60L15/28B60L15/38B60L2240/10B60L2240/12B60L2240/423B60L2260/44Y02T10/72
Inventor 杜玖玉欧阳明高马良峰高明明陈景夫
Owner TSINGHUA UNIV
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