An electric vehicle regenerative braking energy coordinated recovery control method

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

Active Publication Date: 2019-05-03
JILIN UNIV
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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 reco

Method used

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  • An electric vehicle regenerative braking energy coordinated recovery control method
  • An electric vehicle regenerative braking energy coordinated recovery control method
  • An electric vehicle regenerative braking energy coordinated recovery control method

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[0089] The present invention will be described in detail below in conjunction with the drawings:

[0090] The present invention provides a control method for the coordinated recovery of regenerative braking energy of an electric vehicle, such as figure 1 As shown, this method is based on a pure electric vehicle line control system. When the driver steps on the brake pedal to brake, the driving motor becomes a generator for braking energy recovery. The vehicle braking energy recovery controller can be based on the current vehicle The vehicle speed, the state of charge of the battery, the output voltage of the battery and the state of the vehicle system, real-time online distribution of the hydraulic braking torque of the brake-by-wire system and the feedback torque of the drive motor are characterized by the constant input of the brake pedal position. When the vehicle is braked from high speed to standstill, the feedback torque of the drive motor and the hydraulic torque of the br...

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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 automobile chassis braking, and relates to a braking energy recovery control strategy for an electric vehicle, and more specifically, to a coordinated recovery control method for regenerative braking energy of an electric vehicle. 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 batteries, how to increase the cruising range has become the most serious problem facing the development of electric vehicles. Since the electric vehicle has a high-power drive motor, energy can be recovered when the vehicle brakes, which can greatly increase the cruising range of the electric vehicle. The braking energy recovery system can greatly increase the fuel economy of electric vehicles, and the increase is b...

Claims

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Application Information

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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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