ELECTRIC-HYDRAULIC COMPOUND CONTROL ANTI-LOCK
BRAKING SYSTEM |
Feng Yang 1, Xin Chen 1,2, Dong Guo 3, Mingmao Hu 1, Ziwen Liao 1, Zhongcheng Fu 1, Qingshan Gong 1 |
1School of Mechanical Engineering, Hubei University of Automotive Technology 2Chery Commercial Vehicle Co. 3Ministry of Education Key Laboratory of Advanced Manufacturing Technology for Automobile Parts, Chongqing University of Technology |
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ABSTRACT |
An anti-lock control strategy for electric-hydraulic compound braking is proposed to improve the emergency
braking safety of a hub motor electric vehicle. Based on the half-vehicle braking longitudinal dynamics model, the optimal
control is solved to obtain the total braking torque corresponding to each wheel. A fuzzy algorithm is used to determine the
proportion coefficient of the motor based on the battery state of charge coefficient (SOC) and the motor speed constraints on
the motor braking, and the total braking torque is distributed. The hydraulic and motor braking torques obtained from the
allocation are input as reference values to the electric-hydraulic compound braking system, and the output braking torque is
fed back into the CarSim vehicle model. The proposed electric-hydraulic compound ABS control strategy is also validated in
the co-simulation of CarSim and MATLAB/Simulink on high, medium and low adhesion road surfaces. |
Key Words:
Wheel motors, Electric-hydraulic ABS, Optimal control, Brake torque distribution, Fuzzy control |
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