This study deals a robust approach to improve vehicle handling manoeuvres and path tracking performance for front steering system of Sport Utility Vehicles (SUVs). The approach used the dynamic sliding mode control based on an integral sliding surface to enhance the robustness of the proposed controller and vehicle handling performance. In this paper, the controller is designed to be insensitive and robust to system uncertainties and disturbances. Its stability analyse based on Lyapunov theory is introduced to ensure the stability of this close-loop control. The results show the effectiveness of the proposed AFS system in yaw stability for SUV via the co-simulation of Matlab/Simulink and CarSim® under double lane change procedure and various road surface conditions.

Multi-walled carbon nanotubes (CNTs) were directly grown on alumina substrates patterned with Pt interdigitated electrodes by chemical vapor deposition method to fabricate gas sensor. Pt and Ag thin layers with nominal thicknesses of 2 and 4 nm were coated on the CNT layer by evaporation method to modify the CNT properties. The gas sensing results showed that the CNT/Pt-and CNT/Ag-based sensors exhibited enhanced sensitivity to NH 3 gas at room temperature. The responses of the CNT/Pt (3.0%) and CNT/Ag (6.9%) sensors with a 4 nm thick metallic layer to 70 ppm NH 3 were higher than that of pristine CNT sensor (1.5%).

Multiwalled carbon nanotubes (CNTs) were modified with the Hummers method and coated onto Pt electrodes patterned on SiO 2 /Si(001) surface to fabricate chemical sensors. The modified CNTs showed a different structure and increased number of defects compared with pristine CNTs, these properties facilitated the adsorption of NH 3 gas molecules on the CNT surfaces. NH 3 gas sensing results indicate that the sensor exhibited an enhanced response to gas at room temperature. The response of the modified CNT-based sensor was 10 times higher than that of pristine CNT-based sensors.

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