Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (2): 540-549.doi: 10.13229/j.cnki.jdxbgxb.20230093

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Coordinated lateral stability and rollover prevention control for four⁃wheel independent motor drive electric vehicles

He-yao JIANG1(),Yong-hai WANG1,You-dong WU1,Ping WANG2   

  1. 1.The 713rd Research Institute of China State Shipbuilding Corporation Limited,Zhengzhou 450015,China
    2.College of Communication Engineering,Jilin University,Changchun 130022,China
  • Received:2023-02-02 Online:2024-02-01 Published:2024-03-29

Abstract:

In this paper, a control strategy integrating lateral stability and rollover prevention of four-wheel independent drive electric vehicle was proposed in the framework of model predictive control (MPC) to coordinate the lateral, yaw and roll behaviors of the vehicle. Firstly, to ensure the accuracy of the prediction model, the nonlinear tire lateral force model was utilized to predict the future lateral, yaw and roll states of the vehicle. Then, the controller was designed based on the model predictive control method, and multiple control requirements such as improving handling performance, lateral stability, preventing rollover, ride comfort and safety were integrated into the controller. Finally, the simulation results show that the proposed controller can effectively improve the handling stability and lateral stability of the vehicle in high-speed steering, and effectively reduce the roll risk. For the situation of high roll risk caused by the increase of vehicle mass and height of center of mass, even if the controller faces unknown vehicle changes, it can timely and effectively adjust vehicle attitude to prevent vehicle rollover and ensure driving safety.

Key words: model predictive control, vehicle stability control, rollover prevention control, emergency steering maneuvers

CLC Number: 

  • U461.6

Table 1

Vehicle and tire model parameters"

符号定义数值
m整备质量/kg1860
ms簧载质量/kg1590
mu非簧载质量/kg270
Lf质心到前轴距离/m1.18
Lr质心到后轴距离/m1.77
d轴距/m1.575
Re轮胎有效半径/m0.393
Iz横摆转动惯量/(kg·m22687.1
Ix滚动惯量/(kg·m2804.4
hs质心到侧倾中心距离/m0.57
h车辆质心高度/m0.72
hu非簧载质量重心高度/m0.2
Cφ车轮侧倾阻尼系数/(N·m·s·rad-16364
Kφ有效扭转刚度/(N·m·rad-1189 506
βm质心侧偏角归一化最大值/rad0.1
γm横摆角速度归一化最大值/(rad·s-10.4
Tm最大附加电机转矩/(N·m)800
δfm最大附加前轮转角/rad0.1

Table 2

Symbol and description"

符号定义
Fy轮胎侧向力/N
α轮胎侧偏角/rad
Fz轮胎垂向载荷/N
Vx车辆纵向速度/(m·s-1
γ车辆横摆角速度/(rad·s-1
ΔT附加电机转矩/(N·m)
Δδf附加前轮转角/rad
β车辆质心侧偏角/rad
φ侧倾角/rad
φ˙侧倾角速度/(rad·s-1
T驾驶员输入电机转矩/(N·m)
δf驾驶员输入前轮转角/rad

Fig.1

Vehicle dynamics model"

Fig.2

Diagram of coordinated vehicle lateral stability and roll prevention control scheme"

Table 3

Calculation for elements in system matrices with unsaturated tire lateral force"

矩阵元素计算形式
A?112IxCf+CrVx-ms2hs2+mIx
A?122IxCfLf-CrLrγmVx2-ms2hs2+mIxβm-γmβm
A?212CfLf-CrLrβmIzγm
A?222CfLf2-CrLr2IzVx
A?41-2mshsCf+Crβm-ms2hs2+mIx
A?42-2mshsCfLf-CrLrγm-ms2hs2+mIx
B?11-2CfIxδfmVx-ms2hs2+mIxβm
B?21-2LfCfδfmIzγm
B?412Cfmshsδfm-ms2hs2+mIx
D?11-2CfIxδfVx-ms2hs2+mIxβm
D?21-2LfCfδfIzγm+d-Trl+Trr2IzReγm+d-Tfl+Tfr2IzReγm
D?41-2CfmshsReδf-ms2hs2+mIxRe

Table 4

Calculation for elements in system matrices with saturated tire lateral force"

矩阵元素计算形式
A?11,A?21,A?22,A?41,A?42,B?11,B?21,B?410
A?12-γmβm
D?11IxFyflmax+Fyfrmax+Fyrlmax+FyrrmaxVx-ms2hs2+mIxβm
D?21d-Tfl+Tfr-Trl+Trr2IzReγm+LfFyflmax+Fyfrmax-LrFyrlmax+FyrrmaxIzγm
D?41-mshsFyflmax+Fyfrmax+Fyrlmax+Fyrrmax-ms2hs2+mIx

Fig.3

Steering wheel angle of fishhook maneuver"

Fig.4

Simulation results of fishhook maneuver"

Fig.5

Simulation results of fishhook maneuver with a roof cargo load"

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