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Electric vehicle braking energy recovery method

A braking energy recovery and electric vehicle technology, applied in electric vehicles, electric braking systems, electric energy management, etc., can solve the problems of short service life of power batteries, low energy recovery efficiency, and no consideration of motor characteristics and battery status, etc. , to prevent damage, improve energy recovery efficiency, and improve driving experience

Pending Publication Date: 2021-03-05
GUANGDONG GOBAO ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after research, it is found that the energy recovery method of this strategy does not consider the characteristics of the motor and the state of the battery, and there are disadvantages such as low energy recovery efficiency and short service life of the power battery.

Method used

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  • Electric vehicle braking energy recovery method
  • Electric vehicle braking energy recovery method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Please refer to figure 1 , the electric vehicle braking energy recovery method of the present embodiment specifically comprises the following steps:

[0050]Step S11: Obtain the brake button signal, motor speed, current battery SOC, temperature and maximum charging power of the battery.

[0051] Specifically, the driving parameters of the electric vehicle are obtained through sampling: including the brake button signal, the motor speed n, the current SOC value of the battery, etc., and the device parameters are obtained: including the temperature of the battery, the maximum charging power of the battery P chg_max etc. Among them, the brake button signal is determined by the controller detecting the level state of the button; the motor speed, if the speed is measured by the motor Hall sensor, the sampling frequency is 62.5us, and the calculation formula of the motor speed n is:

[0052]

[0053] Among them, SixHallTimeSum is the commutation time count value of six Ha...

Embodiment 2

[0085]Please refer to Image 6 , the electric vehicle braking energy recovery method of the present embodiment specifically includes the following steps.

[0086] Step S21: Obtain the brake handle signal, motor speed, current battery SOC, temperature and maximum charging power of the battery.

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Abstract

The invention discloses an electric vehicle braking energy recovery method. The method comprises the steps of S11, acquiring driving parameters and equipment parameters of an electric vehicle; S12, calculating a motor braking torque instruction according to the braking time, enabling the motor braking torque instruction Teb** to linearly increase along with the counting value of the braking time and approach to the rated braking torque Te of the motor; S13, calculating a target braking torque instruction according to the rotating speed of the motor and the maximum charging power of the battery; and S14, calculating a current braking torque instruction according to the SOC value of the battery and the temperature of the battery. The method has the advantages that the driving experience of adriver is improved; the energy recovery efficiency is improved; and the damage to the battery caused by long-time high-current charging is prevented, and the service life of the battery is ensured.

Description

technical field [0001] The invention relates to an energy recovery technology in feedback braking of an electric vehicle controller, in particular to a braking energy recovery method for an electric vehicle, which belongs to the technical field of motor vector control. Background technique [0002] Two-wheeled electric vehicles have quickly become the best choice for people's green travel due to their advantages of zero emissions, flexibility and compactness, but low energy density of batteries and low driving range have also become bottlenecks hindering their development. Energy recovery technology enables electric vehicles to store part of the braking energy in the form of electric energy through the conversion device during the braking process, and reuse it when driving, thereby improving energy utilization and driving range of the vehicle. [0003] At present, the application of energy recovery technology in the field of two-wheeled electric vehicles is seriously insuffi...

Claims

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Application Information

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IPC IPC(8): B60L7/10B60L15/20
CPCB60L7/10B60L15/2009B60L2240/423B60L2240/421Y02T10/72
Inventor 陈清付胡维超周乐栓简瑞谦宁德胜
Owner GUANGDONG GOBAO ELECTRONICS TECH CO LTD
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