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Control method for regenerative braking system of electric vehicle

A technology of regenerative braking and control method, which is applied in the direction of electric braking system, electric vehicle, control drive, etc., can solve the problems of unable to meet the power motor compensation, braking feeling and comfort deterioration, etc., to reduce the impact , The effect of braking energy recovery guarantee

Pending Publication Date: 2021-05-11
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Poor coordination between the frictional braking force and the regenerative braking force of the power motor in transitional conditions leads to poor braking feeling and comfort
For hydraulic braking force intervention conditions, the existing power motor torque compensation strategy cannot meet the compensation of power motor regenerative braking torque for friction braking

Method used

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  • Control method for regenerative braking system of electric vehicle
  • Control method for regenerative braking system of electric vehicle
  • Control method for regenerative braking system of electric vehicle

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Embodiment Construction

[0054] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying Elements must have certain orientations, be constructed and operate in certain orientations, and therefore should not be construed as limitations on the invention.

[0055] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0056] 1. According to the vehicle state and traffic environment combined with the driver's current braking demand, predict the driver's braking demand change; according to the driver's current braking demand and the predicted driver's braking demand change.

[0057] The method for predicting changes in the driver's braking demand can use an...

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Abstract

The invention discloses a control method for a regenerative braking system of an electric automobile, and relates to the field of automobile braking control. The control method comprises the steps of braking strength prediction, optimal braking force distribution and motor torque compensation, wherein the braking strength prediction is to predict the braking demand change of a driver by adopting an autoregression model or a Markov probability transfer model according to the vehicle state and the traffic environment in combination with the current braking demand of the driver. According to the current braking demand of the driver and the predicted braking demand change of the driver, a regenerative braking torque and a friction braking torque are distributed in combination with a nonlinear model prediction control method, and factors such as the braking energy recovery rate, the driver pedal feeling and the braking comfort are considered, thereby designing a constrained nonlinear model prediction controller considering the braking behavior of the driver; and finally, the difference value between the target friction braking torque and the actual friction braking torque of the electric power-assisted braking system is directly compensated through the regenerative braking torque of the power motor, and the situation that the response speed of the hydraulic braking system is low is improved.

Description

technical field [0001] The invention relates to the technical field of brake control of new energy vehicles, in particular to design a control method for a regenerative braking system of an electric vehicle. Background technique [0002] In the regenerative braking process of electric vehicles, since the regenerative braking torque of the power motor changes according to the vehicle speed, there will be braking transition conditions during the regenerative braking process, mainly including hydraulic braking force intervention, withdrawal and regenerative braking. Three types of typical transition conditions for low-speed withdrawal of power. In transitional conditions, poor coordination between the frictional braking force and the regenerative braking force of the power motor results in poor braking feeling and comfort. For the hydraulic braking force intervention condition, the existing power motor torque compensation strategy cannot meet the compensation of the power moto...

Claims

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Application Information

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IPC IPC(8): B60L7/10B60L15/20
CPCB60L7/10B60L15/20Y02T10/72
Inventor 雍加望张卫强冯能莲李岩松
Owner BEIJING UNIV OF TECH
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