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Coordinated recovery control method for electric vehicle regenerative braking energy

A technology of regenerative braking and energy coordination, applied in electric vehicles, electric braking systems, braking components, etc., can solve problems such as braking torque distribution

Active Publication Date: 2020-07-21
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of distribution of braking torque between the brake-by-wire system and the drive motor when the braking energy is recovered, the present invention proposes a method that can distribute the brake torque between the brake-by-wire system and the drive motor online in real time

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  • Coordinated recovery control method for electric vehicle regenerative braking energy
  • Coordinated recovery control method for electric vehicle regenerative braking energy
  • Coordinated recovery control method for electric vehicle regenerative braking energy

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Embodiment Construction

[0090] The present invention is described in detail below in conjunction with the accompanying drawings:

[0091] The present invention proposes a coordinated recovery control method for regenerative braking energy of an electric vehicle, such as figure 1 As shown, this method is based on a pure electric vehicle brake-by-wire system. When the driver depresses the brake pedal, the drive motor turns into a generator to recover braking energy. The vehicle braking energy recovery controller can According to the speed of the vehicle, the state of charge of the battery, the output voltage of the battery and the state of the vehicle system, the hydraulic braking torque of the brake-by-wire system and the feedback torque of the drive motor are distributed online in real time. The vehicle is braked from high speed to standstill, and the feedback torque of the drive motor and the hydraulic torque of the brake-by-wire system will continue to be cooperatively controlled to meet the driver...

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Abstract

The invention provides an electric vehicle regenerative braking energy coordinated recovery control method, which is based on a pure electric vehicle brake-by-wire system, and the energy is recoveredunder the coordinated control of the hydraulic braking torque of the brake-by-wire system and the feedback torque of a driving motor; the method comprises the following steps: 1, establishing a regenerative braking control system model; 2, modeling a driving motor and a battery; 3, designing a vehicle braking energy recovery controller; 4, selecting a control quantity and finishing control. According to the method, a regenerative braking control system model based on model predictive control is established; a brake energy recovery controller is designed; the hydraulic braking torque of the electro-hydraulic braking system and the feedback torque of the driving motor are selected as input of the controller, the hydraulic braking torque and the feedback torque of the driving motor are distributed in a coordinated mode to realize maximum braking energy recovery, such that the braking smoothness is guaranteed, the braking requirement of a driver is met, meanwhile, the front-back slippage rate is as small as possible, and the braking safety is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of vehicle chassis braking, relates to a control strategy for braking energy recovery of electric vehicles, and more specifically, relates to a coordinated recovery control method for regenerative braking energy of electric vehicles. Background technique [0002] At present, the development trend of new energy vehicles is dominated by hybrid vehicles in the short term, but pure electric drive is the development direction in the long run. However, electric vehicles are limited by the capacity of the battery, and how to increase the cruising range has become the most serious problem facing the development of electric vehicles. Since electric vehicles have high-power drive motors, energy recovery can be performed when the vehicle brakes, which can greatly increase the cruising range of electric vehicles. The braking energy recovery system can greatly increase the fuel economy of electric vehicles, depending on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L7/10B60T8/34
Inventor 郭洪艳朱飞白薄悦郭洋洋陈虹刘俊
Owner JILIN UNIV
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