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Torque distribution method of four-wheel drive electric vehicle

A torque distribution method and electric vehicle technology, applied in electric vehicles, control drives, vehicle components, etc., can solve problems such as wheel locking, not fully considering the state of yaw moment adhesion coefficient, and affecting vehicle stability

Inactive Publication Date: 2013-09-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For traditional automobiles and most of the driving torque distribution strategies based on rule-based methods, it is only considered to control the braking force of a tire with a large influence factor to achieve the corresponding control target. Such control does not fully consider each tire. The yaw moment that can be provided and the state of the adhesion coefficient of each tire can easily cause a certain wheel to be completely locked, which will affect the stability of the vehicle

Method used

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  • Torque distribution method of four-wheel drive electric vehicle
  • Torque distribution method of four-wheel drive electric vehicle
  • Torque distribution method of four-wheel drive electric vehicle

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[0103] For the total mass of 1296kg, the moment of inertia around the Z axis is 1750kgm2, the wheelbase is 2.57m, the distance from the center of mass to the front axle is 1.25m, the distance from the center of mass to the rear axle is 1.32m, the front wheelbase is 1.405m, the rear wheelbase is 1.399m, and the height of the barycenter is 0.45 m, and a four-wheel drive electric vehicle with a wheel radius of 0.326m is used for verification. The speed of the vehicle is increased from 0km / h to 70km / h, and at the same time, it bypasses 7 obstacles within 8 to 25s, simulating the serpentine movement condition, and the friction coefficient of the road surface is set to u=0.7, which is normal for dry asphalt roads coefficient of friction.

[0104] figure 1 The shown four-wheel drive electric vehicle torque distribution method first uses the vehicle sensor system to collect the real-time driving torque (T i ) and yaw moment value (M z ); then determine the longitudinal force weight...

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Abstract

The invention provides a torque distribution method of a four-wheel drive electric vehicle, which comprises the following steps: considering parameters such as front wheel longitudinal force and transverse force, back wheel tyre longitudinal force, tyre friction coefficient, tyre load, tyre radius and maximal driving torque of a wheel hub motor, optimizing weight coefficient of the parameters, meanwhile considering the driving force limit condition of a drive motor, adopting a linear analytic method, providing a stable distribution and optimization method, guaranteeing the stability and controllability of a vehicle body, and utilizing ground friction force to the maximal limit.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle motor control, and more specifically relates to a torque distribution method for a four-wheel drive electric vehicle, that is, how to distribute the four-wheel torque when the four-wheel drive electric vehicle is running. Background technique [0002] In order to cope with increasingly prominent problems such as energy shortage and environmental pollution, electric vehicles have become a research hotspot due to their advantages of low emission and low noise. Four-wheel drive electric vehicles occupy an increasing proportion in the research field of electric vehicles because of their advantages in control and energy saving. As one of the electronic control technologies of four-wheel drive electric vehicles, the torque distribution strategy has been valued by many scientific research institutions and enterprises. [0003] At present, the torque distribution methods of four-wheel drive elec...

Claims

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Application Information

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IPC IPC(8): B60L15/00
Inventor 秦刚李文辛晓帅邹见效
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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