Development Of Four Wheel Steering For Vehicle Handling Enhancement

Lai, Qili (2013) Development Of Four Wheel Steering For Vehicle Handling Enhancement. Project Report. UTeM, Melaka. (Submitted)

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Abstract

Four wheel steering is also known as all wheel which is used to improve handling and improve the vehicle stability. In this project, the yaw rate error and vehicle side slip angle error of a 4WS vehicle are been studied. When a 2WS vehicle undergoes sharp cornering or lane changing at high speed, it will have the tendency to occur understeer and oversteer. With adaption of four wheel steering system, it will reduce the yaw rate error and vehicle side slip angle error thus reducing the oversteer and understeer problems. The objectives of this project are to develop vehicle dynamics model and develop active four wheel steering control strategy. The scope of this project includes development of the mathematical model and Matlab/SIMULINK to represent dynamic behavior of the vehicle in longitudinal direction, validation of vehicle model with validated vehicle dynamics software and development of active four wheel steering for vehicle handling improvement. 2 DOF bicycle model was developed, validation was done on the vehicle model with CarSim with double lane change test and step steer test. PID controller and the fuzzy logic controller were developed in the vehicle model, and simulation was done to do comparison. It is found out that both P controller and fuzzy logical controller can able to reduce the yaw rate and the vehicle side slip angle of the vehicle during cornering. P controller performs better than fuzzy logic controller in term of controlling single input while fuzzy logic controller perform better in term of controlling two inputs at the same time. The developed has proven the its capability to reduce the vehicle side slip angle and yaw rate errors and hence reduced the tendency to understeer and oversteer.

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