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Research of Active Front Wheel Steering Control Methods for 4WD Electric Vehicle

Author: HouHui
Tutor: MaLei；ZhangRunSheng
School: Yanshan University
Course: Vehicle Engineering
Keywords: AFS control method 4WD electric vehicle Yaw rate Sideslip angle Guaranteed Cost Control
CLC: U461.6
Type: Master's thesis
Year: 2011
Downloads: 153
Quote: 0
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Abstract


Energy-saving , environmental protection and security is the theme of development of the modern automobile . Energy and environmental challenges facing the 21st century , the world will be auto energy saving, energy and environmental protection as an important area of ??research . Among them , the electric car concern. At the same time , the impact on traffic and road safety , car safety and the stability of the car is one of the effective measures to improve security . In this paper, based on the the wheel motor four-wheel independent drive electric vehicles for the study, car handling and stability in cornering conditions , the use of the active front steering control , combined with the guaranteed cost control and PID control theory , to determine the control method , and its research , to provide a certain amount of research ideas to improve vehicle handling and stability . First create the required models, including vehicle dynamics model , motor model and co-simulation model . Ignore the part of the component , ADAMS / View module simplified vehicle dynamics model established in Matlab / Simulink motor model and control model , the completion of the two co-simulation modeling . Secondly, the control method of the active front . Two-degree-of-freedom vehicle model based on the desired yaw rate and sideslip angle as a control system to track the object , front wheel angle and direct yaw moment control strategy as a control input . Consider the speed of uncertainty and direct yaw torque feedforward - feedback controller is designed . Yaw torque feedforward compensation and the driving force difference is formed to be allocated for the four-wheel drive force , and enable the vehicle to turn, with the yaw angular velocity and the centroid side declination good tracking of the ideal model . Finally, the controller is applied to co-simulation step input and sinusoidal input conditions of the vehicle stability study to verify the accuracy of the simulation model and controller stability and fast .

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CLC: > Transportation > Road transport > Automotive Engineering > Car theory > Vehicle handling and stability
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