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A new braking force distribution strategy for electric vehicle based on regenerative braking strength continuity

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Abstract

Regenerative braking was the process of converting the kinetic energy and potential energy, which were stored in the vehicle body when vehicle braked or went downhill, into electrical energy and storing it into battery. The problem on how to distribute braking forces of front wheel and rear wheel for electric vehicles with four-wheel drive was more complex than that for electric vehicles with front-wheel drive or rear-wheel drive. In this work, the frictional braking forces distribution curve of front wheel and rear wheel is determined by optimizing the braking force distribution curve of hydraulic proportional-adjustable valve, and then the safety brake range is obtained correspondingly. A new braking force distribution strategy based on regenerative braking strength continuity is proposed to solve the braking force distribution problem for electric vehicles with four-wheel drive. Highway fuel economy test (HWFET) driving condition is used to provide the speed signals, the braking force equations of front wheel and rear wheel are expressed with linear equations. The feasibility, effectiveness, and practicality of the new braking force distribution strategy based on regenerative braking strength continuity are verified by regenerative braking strength simulation curve and braking force distribution simulation curves of front wheel and rear wheel. The proposed strategy is simple in structure, easy to be implemented and worthy being spread.

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Correspondence to Yan-tao Tian  (田彦涛).

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Foundation item: Project(JS-102) supported by the National Key Science and Technological Program of China for Electric Vehicles; Project supported by Jilin University “985 Project” Engineering Bionic Technology Innovation Platform, China

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Lian, Yf., Tian, Yt., Hu, Ll. et al. A new braking force distribution strategy for electric vehicle based on regenerative braking strength continuity. J. Cent. South Univ. 20, 3481–3489 (2013). https://doi.org/10.1007/s11771-013-1872-5

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  • DOI: https://doi.org/10.1007/s11771-013-1872-5

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