Control method of regenerative braking system of double-shaft double-motor four-wheel drive pure electric vehicle

A technology of regenerative braking and four-wheel drive, which is applied in electric braking systems, electric vehicles, control drives, etc., can solve the problems of low energy recovery efficiency, improve energy recovery efficiency, ensure braking safety, and ensure safety sexual effect

Inactive Publication Date: 2017-11-21
CHERY AUTOMOBILE CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

The disadvantage of existing braking control methods for dual-axis dual-motor four-wheel drive electric vehicles is that the energy recovery efficiency is not high under the premise of ensuring braking safety

Method used

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  • Control method of regenerative braking system of double-shaft double-motor four-wheel drive pure electric vehicle
  • Control method of regenerative braking system of double-shaft double-motor four-wheel drive pure electric vehicle
  • Control method of regenerative braking system of double-shaft double-motor four-wheel drive pure electric vehicle

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Embodiment Construction

[0030] Such as figure 1 As shown, the vehicle controller can perform regenerative braking control on the vehicle by controlling the front axle motor and the rear axle motor, and the vehicle controller acts on the brake through the pressure control unit to mechanically brake the vehicle. This is the prior art.

[0031] Such as figure 2 As shown, the control method of the dual-axis dual-motor four-wheel drive pure electric vehicle regenerative braking system of the present invention is:

[0032] 1. Conditions for starting regenerative braking

[0033] When the driver steps on the brake pedal, the vehicle controller calculates the braking strength Z required by the current vehicle and the total required braking force F according to the signal sent by the pressure control unit. xb , the vehicle controller obtains the current motor speed V m and battery state of charge SOC, and calculate the maximum motor braking force F that the motor can provide at the current vehicle speed ...

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Abstract

The invention relates to a control method of a regenerative braking system of a double-shaft double-motor four-wheel drive pure electric vehicle. The control method comprises the following steps that when a driver steps on a brake pedal, according to a signal transmitted by a pressure control unit, a vehicle control unit (VCU) calculates out brake strength Z required by a current vehicle and general required braking force F<xb>; the VCU obtains a current motor speed V<m> and a battery charge state SOC, and calculates maximum motor brake force F<m-max> which can be provided by a motor in a current vehicle speed; and when the following conditions that the brake strength Z required by the current vehicle is lower than a set brake strength maximum value Z<max>, the current motor speed V<m> is greater than a set motor minimum rotating speed V<min>, and the value of the battery charge state SOC is lower than a set threshold value of the battery charge state SOC are met, the vehicle control unit starts to perform regenerative braking.

Description

technical field [0001] The invention relates to a control method for a regenerative braking system of a pure electric vehicle driven by two shafts and two motors with four wheels. Background technique [0002] Most of the existing pure electric vehicles have a single-axis single-motor two-wheel drive structure. Compared with a single-axis motor two-wheel drive electric vehicle, a two-axis dual-motor four-wheel drive electric vehicle can make full use of the fast response of the motor when recovering braking energy. It can freely adjust the distribution of front and rear axle braking force, and has good compatibility in terms of braking stability and energy recovery rate. The disadvantage of the existing braking control method for a four-wheel drive electric vehicle with two shafts and two motors is that the efficiency of energy recovery is not high under the premise of ensuring braking safety. Contents of the invention [0003] The purpose of the present invention is to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L7/26B60L15/20
CPCB60L7/26B60L15/2009B60L2220/42Y02T10/72
Inventor 余进超
Owner CHERY AUTOMOBILE CO LTD
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