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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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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  • 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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Embodiment Construction

[0089] The present invention is described in detail below in conjunction with accompanying drawing:

[0090] The present invention proposes a coordinated recovery control method for electric vehicle regenerative braking energy, such as figure 1 As shown, this method is based on a brake-by-wire system of a pure electric vehicle. When the driver steps on the brake pedal to brake, the driving motor becomes a generator for braking energy recovery, and the vehicle braking energy recovery controller can 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, and the real-time online distribution of the hydraulic braking torque of the brake-by-wire system and the feedback torque of the drive motor. It is characterized in that under a constant brake pedal position input, When the vehicle brakes from high speed to stationary, the feedback torque of the driving motor and the hydraulic torque of the brake-by-wir...

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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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