Active front steering for passenger vehicle using fuzzy PID method

Mohd Saiful , Md Sukardi (2016) Active front steering for passenger vehicle using fuzzy PID method. Masters thesis, Universiti Teknikal Malaysia Melaka.

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This master project report for this final year project is about improving handling behaviour of passenger car by using active front steering. Active Front Steering (AFS) is a newly developed technology for passenger cars. It provides an electronically controlled superposition of an angle to the hand steering wheel angle that is prescribed by the driver. This additional degree of freedom enables a continuous and driving-situation dependent adaptation of the steering characteristics. At the heart of the new Active Steering system is the planetary gear set integrated into the steering column. An electric motor in the joint adjusts the front wheels' steering angle in proportion to the vehicle current speed. This active steering is evaluated by simulating different steering inputs. The active steering solution must be implemented in Matlab/Simulink. A vehicle model is also implemented in Matlab/Simulink. This master project fo cuses on comparison on both two systems: a conventional vehicle for passenger vehicle and a controlled ve~cle. Simulation is made for a constant speed and a specific changeable road adhesion coefficient. The motivation for this work is to understand and characterize the response of a vehicle with a complementary steering system. Improved stability is obtained for the passenger vehicle due to side wind disturbances or slippery road driving. A passenger vehicle tends to lose its dynamic mobility when cruising on the roads that have side wind disturbances. This is due to the effect of the side wind force that reacts at the center of the vehicle body, which creates an unwanted yaw moment at the vehicle's center of gravity. In order to enhance the mobility performance of the passenger vehicle, a control strategy, i.e. yaw rejection control, is designed and test on a passenger vehicle model. The purpose of the control strategy is to maintain the directional mobility of the passenger vehicle by providing a steering correction angle to the pitman arm steering system. The control strategy proposed in this study consists of two main structures: yaw rate feedback control using a ProportionalIntegral- Derivative (PID) controller using an adaptive Fuzzy-Proportional-IntegralDerivative (Fuzzy-PID) controller. The simulation results in terms of yaw and lateral motions were observed, and the proposed control strategy was shown to successfully improve the directional mobility of the passenger vehicle after cruising on the side wind road. The benefit of the proposed control strategy with Fuzzy-PID control is evaluated by comparing its performance to PID and Fuzzy-PID control strategies. Vehicle dynamic controls will continue to deliver safer, more pleasing products to consumers at greater value.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Automobiles -- Springs and suspension,Automobiles -- Steering-gear.
Subjects: T Technology > T Technology (General)
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: Library > Tesis > FKM
Depositing User: Mohd. Nazir Taib
Date Deposited: 03 Apr 2018 03:53
Last Modified: 03 Apr 2018 03:53
Statistic Details: View Download Statistic

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