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Brake energy feedback control system of pure electric automobile

A technology of braking energy feedback and pure electric vehicles, which is applied in electric braking systems, electric vehicles, electric energy management, etc., and can solve problems such as inability to lock wheels, inability to actively avoid vehicle shaking, and difficulty in obtaining satisfactory results.

Inactive Publication Date: 2011-08-31
CHONGQING CHANGAN AUTOMOBILE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] In the existing braking energy feedback control system of pure electric vehicles, it is first necessary to accurately identify the current road surface adhesion coefficient, which is difficult to obtain satisfactory results in practical applications; secondly, after the ABS works, the braking energy feedback is passively stopped, It is impossible to actively avoid the occurrence of wheel lock before the ABS works; finally, it cannot actively avoid the occurrence of vehicle shaking when the vehicle is braking or coasting

Method used

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  • Brake energy feedback control system of pure electric automobile
  • Brake energy feedback control system of pure electric automobile
  • Brake energy feedback control system of pure electric automobile

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Embodiment Construction

[0022] The utility model will be described in further detail below through specific embodiments in conjunction with the accompanying drawings.

[0023] Such as figure 1 The schematic diagram of regenerative braking with braking energy feedback is shown. Generally speaking, the voltage generated by the braking energy regenerative power generation system is always lower than the battery voltage, so in order to charge the electric energy generated by the braking energy regenerative power generation system into the battery, a special control system must be adopted to make the motor work in regenerative braking mode . The principle of braking energy feedback regenerative braking is as follows: figure 1 shown. in the picture is the resistance, is the braking current limiting resistor, is the battery voltage, is the induced potential of the motor, and L is the inductance of the motor armature. When working, the drive current of the motor armature is disconnected, and the ...

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Abstract

The invention discloses a brake energy feedback control system of a pure electric automobile. The system in the invention combines electric brake and mechanical brake, wherein the electric brake is realized by controlling a motor to work in a generating state; and the mechanical brake is realized by an electronic brake system. An entire automobile control unit is a core control unit of the brake energy feedback control system; and the entire automobile control unit is used for calculating brake torque needed by the motor and the brake force needed by the electronic brake system, and respectively transmitting control commands to a motor controller control circuit and the electronic brake system. The brake energy feedback control system in the invention not only meets the brake requirements of the automobile under various work conditions, but also ensures the stability of the automobile during driving and the smoothness of automobile brake speed reduction; and furthermore, the system is capable of effectively recovering the brake energy and improving the use efficiency of the entire automobile energy.

Description

technical field [0001] The invention belongs to the technical field of pure electric vehicles, and relates to a braking energy feedback control system for pure electric vehicles, in particular to a braking energy feedback control system for pure electric vehicles with front axle electric drive and electric and mechanical combined braking. Background technique [0002] It is impossible for the driving motor of a pure electric vehicle to completely stop rotating immediately after the power is cut off. It always rotates for a period of time under the inertia of itself and the load it carries before stopping. Therefore, in today's tight energy supply, using the remaining energy in the braking process of the drive motor has naturally become a hot spot in research and development. [0003] The methods of motor braking can be divided into two categories: mechanical braking and electrical braking. Electric braking can be divided into three forms: reverse braking, energy consumption...

Claims

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Application Information

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IPC IPC(8): B60L7/18
CPCY02T10/7241B60L7/26B60L2220/14B60L7/14
Inventor 张正兴周洪波肖伟腾波李小雨
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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