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Generation method of regenerative braking policies of double-shaft drive pure electric vehicle

A pure electric vehicle, regenerative braking technology, applied in electric vehicles, electric braking systems, vehicle components, etc., can solve the problem of not fully considering the impact of the regenerative braking force energy recovery of the front and rear axles, etc.

Active Publication Date: 2017-05-10
SUN YAT SEN UNIV +1
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AI Technical Summary

Problems solved by technology

[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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  • Generation method of regenerative braking policies of double-shaft drive pure electric vehicle
  • Generation method of regenerative braking policies of double-shaft drive pure electric vehicle
  • Generation method of regenerative braking policies of double-shaft drive pure electric vehicle

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Embodiment Construction

[0023] The present invention is further described in conjunction with the following examples.

[0024] The models of the front and rear motors driven by the two shafts can be the same or different. Among them, using the same front and rear motors can reduce the complexity of electronic control and equipment costs. For electric vehicles with different motors, the analysis method remains the same. Most of the two-axis drive electric vehicles have the same front and rear transmission ratio i, and a small amount is different. In this embodiment, the front and rear transmission ratio i are the same, and the front and rear transmission ratios are the same. All are η mec . Such as figure 2 As shown, the motor efficiency MAP diagram of the front and rear motors in the energy feedback state is obtained through the bench test. The flow chart of regenerative braking strategy generation is as follows: figure 1 As shown, the optimization model of the front axle regenerative braking f...

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Abstract

The invention relates to the field of design of electric vehicles, in particular to a generation method of regenerative braking policies of a double-shaft drive pure electric vehicle. Firstly, a proportionality coefficient of a front wheel regenerative braking torque to a total regenerative braking torque corresponding to different wheel upper rotating speeds n and different wheel upper regenerative braking torque demands T is calculated according to MAP maps of front and back motors; the proportionality coefficient enables the utilization efficiency of front and back motor systems to be the highest; then, a braking safety area is calculated according to whole vehicle parameters, ECE braking safety regulations and an ideal braking distribution curve; finally, the regenerative braking policies are generated according to the proportionality coefficient and the braking safety area; and the regenerative braking policies enable the recovery efficiency of regenerative braking energy to be the highest, so that the influence on the energy recovery by the distribution of front and back shaft regenerative braking force is fully considered, and more braking energy is recovered.

Description

technical field [0001] The invention relates to the field of electric vehicle design, in particular to a method for generating a regenerative braking strategy of a pure electric vehicle driven by two shafts. 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-axis 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 recovery potential , therefore, most of the braking en...

Claims

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Application Information

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IPC IPC(8): B60L7/10B60W30/18
CPCB60W30/18127B60L7/10
Inventor 熊会元刘中文朱雄来宗志坚
Owner SUN YAT SEN UNIV
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