Generation method and device of regenerative braking strategy

Abstract

The invention discloses a generation method of a regenerative braking strategy. The generation method of the regenerative braking strategy is suitable for a double-motor double-shaft driving electriccar and includes the steps of obtaining a corresponding distribution coefficient of double motor regenerative braking torques when a double motor device has the highest efficiency under the requirements for different rotation speeds of wheels and different regenerative braking total torques according to a double motor loss model, thereby obtaining the best distribution coefficient; calculating a braking safe area according to the whole car structure parameter, ECE braking safety codes and an ideal braking distribution curve; and generating the regenerative braking strategy according to the obtained beast distribution coefficient and the braking safe area, wherein the regenerative braking strategy enables the regenerative braking energy recycling efficiency to be the highest. In the whole car optimization design period, the influence of the double motor regenerative braking power distribution coefficient on energy recycling can be fully considered, and the energy recycling efficiency inthe braking process can be improved.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a method and device for generating a regenerative braking strategy. Background technique [0002] Braking energy recovery is an important means to improve the energy utilization efficiency of electric vehicles, and the amount of braking energy recovered is closely related to the braking energy recovery strategy. The braking strategy developed for single-axle drive electric vehicles distributes excessive braking force to the electric drive axle, thereby increasing the recuperation of braking energy, but this tends to reduce braking stability. Compared with single-axis drive electric vehicles, dual-motor front and rear axle drive electric vehicles can output motor braking torque on each electric drive shaft, which can better ensure braking stability, reduce the participation of ABS, and have higher energy recuperation potential, therefore, most of the braking energy recovery strat...

AI Technical Summary

Problems solved by technology

The braking strategy developed for single-axle drive electric vehicles distributes excessive braking force to the electric drive axle, thereby increasing the recuperated braking energy, but this tends to reduce braking stability

Compared with single-axis drive electric vehicles, dual-motor front and rear axle drive electric vehicles can output motor braking torque on each electric drive shaft, which can better ensure braking stability, reduce the participation of ABS, and have higher energy recuperation potential, therefore, most of the braking energy recovery strategies developed for single-axle-drive EVs are not applicable to dual-axle-drive EVs

In addition, there is also a lack of method and device support to obtain the maximum energy recovery of the vehicle during the design and selection phase of the dual motor parameters.

[0003] At present, the research on the braking strategy of dual-axis drive is mostly based on the distribution of regenerative braking force and mechanical braking force on each electric drive shaft, and the impact of the distribution of regenerative braking force on the front and rear axles on energy recovery is not fully considered.

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