Implementation method for electric vehicle braking force redistribution

Abstract

The present invention belongs to the field of electric vehicle active safety, and especially relates to an implementation method for electric vehicle braking force redistribution. The method comprises the following steps: step one, simplification of a safety brake scope; second step, distribution of braking force for the first time; step three, calculation of power demand efficiency; and step four, redistribution of braking force. The present invention refers to an electric vehicle braking force redistribution strategy, the power demand efficiency is introduced into the braking force distribution strategy under the condition of considering the copper loss and iron loss of a permanent magnet synchronous motor, so that the braking force distribution strategy better accords to the actual situations, the effectiveness and practicability of braking force distribution are improved, and a support for the theoretical basis is enhanced.

Description

technical field [0001] The invention belongs to the field of active safety of electric vehicles, and specifically relates to a method for realizing redistribution of braking force of electric vehicles. Background technique [0002] The research and development of the braking force distribution strategy is indispensable whether the vehicle active collision avoidance system controller adopts the direct control structure or the layered control structure. For the research on the braking force distribution strategy of electric vehicles, the problem to be solved is the distribution of friction braking force and regenerative braking force. In this regard, many scholars have proposed many methods to solve this problem, for example, Non-Patent Document 1 Research on Control Algorithms for Regenerative Braking of Electric Vehicles, authors, Li Yufang, Lin Yi, He Hongwen, Chen Luhua; Non-Patent Document 2 Automobile Regenerative Braking System Braking force distribution, author, Chen ...

AI Technical Summary

Problems solved by technology

[0004] In addition, the research on the braking force distribution strategy based on the braking intensity is mainly concentrated in the electric vehicle braking system with dual-drive structure, but there is little research on the braking force distribution strategy for the four-wheel independent drive electric vehicle.

The braking force of an electric vehicle with four-wheel independent drive is divided into the frictional braking force and regenerative braking force of the front wheel and the frictional braking force and regenerative braking force of the rear wheel. Power distribution is more complicated

[0007] 1. Most of the braking force distribution strategies are researched on front-drive or rear-drive electric vehicles, while there are few studies on four-wheel independent drive electric vehicles;

[0008] 2. Most of the braking force distribution strategies are carried out under ideal conditions, without considering the constraints, and the distance from the actual application is relatively large;

[0009] 3. Most of the braking force distribution strategies have a certain degree of subjectivity and experience, and the versatility is poor

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