Pure electric passenger car regenerative braking control method

A pure electric passenger car, regenerative braking force technology, applied in electric vehicles, electric braking system, control drive and other directions, can solve the problems of difficult distribution, poor energy recovery effect, etc., to ensure the effect of braking efficiency

Active Publication Date: 2019-09-24
南京恒立智能技术有限公司
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Problems solved by technology

[0004] However, among the above two methods, the first one is more difficult to distribute strictly according to the I curve, and the second one has poor energy recovery effect

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  • Pure electric passenger car regenerative braking control method
  • Pure electric passenger car regenerative braking control method
  • Pure electric passenger car regenerative braking control method

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Embodiment Construction

[0035] The design method of the present invention will be described in detail below in conjunction with specific embodiments.

[0036] 1 Regenerative braking control strategy flow

[0037] Such as figure 1 As shown, with the goal of optimal braking energy recovery, combined with traditional vehicle braking force distribution methods, and on the premise of meeting the requirements of ECE braking regulations, this patent formulates a regenerative braking control strategy based on braking intensity.

[0038] The required total braking force is equal to the friction braking force plus the regenerative braking force; the pure electric bus is rear-wheel driven, so the front wheels only perform friction braking; when the battery pack SOC>0.9 or the motor speed n m Stop charging the battery pack when <200r / min.

[0039] 2 Relationship between braking strength and braking force distribution coefficient based on ECE braking regulations

[0040] Such as figure 2 As shown, for the M3...

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Abstract

The invention provides a control strategy for a pure electric passenger car to effectively improve regenerative braking energy recovery rate and ensure high braking efficiency on the premise of less modification of a friction braking system. The control strategy includes the following steps that according to the basic theory of braking force distribution and ECE braking regulations, the change range of braking force distribution coefficient beta i is determined; under the general condition of braking strength, total braking force is shared by regenerative braking and friction braking according to the control strategy, to ensure the effective utilization of regenerative braking force, and to maintain the total braking force equal to the demand braking force of curve I, friction braking force increases gradually from 0, braking is conducted according to an original passenger car beta line, and the regenerative braking force is equal to the difference value between the curve I and the beta line; and the determination of the slope of the beta line is guided by increasing the energy recovery rate of the regenerative braking as much as possible and the requirement of the ECE braking regulations.

Description

technical field [0001] The invention relates to the technical field of regenerative braking of pure electric passenger cars, specifically, a braking force distribution coefficient β is determined based on the basic theory of braking force distribution and ECE braking regulations. i The range of variation, and then determine the design method of the slope of the β line. Background technique [0002] Energy saving and emission reduction is the development trend of today's era. The development of pure electric buses is not only an important link to realize energy saving and emission reduction, but also shoulders the green and healthy development concept of public transportation. Due to the strong support of the state finance for pure electric buses, my country has developed rapidly in this field in recent years and has become the world's largest market for pure electric buses. [0003] In the prior art, commonly used regenerative braking control strategies include: optimal fee...

Claims

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Application Information

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IPC IPC(8): B60L7/26B60L15/20
CPCB60L7/26B60L15/2009B60L2240/421Y02T10/72
Inventor 郑燕萍丛铭郭阳江毓
Owner 南京恒立智能技术有限公司
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