D. M. Cham, M. Shanmugavel and V. R. Sampathkumar
Abstract: This paper proposes and presents the preliminary results of an integrated safety warning system for road vehicles based on lateral g-force monitoring. The proposed system issues a warning to the driver when the lateral load increases above a threshold level thereby reducing the risk of run-off-road crashes and loss of control. From the vehicles dynamic model, soft and hard speed limits are obtained. When the soft limit is breached, it warns the driver using a LED, and when the hard limit is breached, assistive braking is activated. Simulations were conducted to obtain the safe vehicle speed for various steering angle to ensure the lateral g-force remains in the range of 0.7 and 0.9. Vehicle parameters of the Proton Saga 1.3L were used for simulation. Simulation runs to study the effects of changes in steering-wheel angle and vehicle speed on the variation of lateral acceleration was performed, based on which a safe speed is obtained. Simulations were also conducted on both banked and unbanked roads. The results of this study would help in the design of a working prototype of the safety system.
Keywords:Driver warning system, steering limit, speed limit
Chung, T., & Yi, K. (2007). An investigation into differential braking strategies on a banked road for vehicle stability control. Journal of Automobile Engineering, 221(4), 443-455.
Ghoneim, Y. A. (2013). Vehicle dynamics approach to driver warning. International Journal of Vehicular Technology, 2013, 1-18. doi: 10.1155/2013/109650
Lin, L., Jinhai, L., & Yan, W. (2013). Traffic crash characteristic analysis on mountain roads. Proceedings of the 2013 5th International Conference on Measuring Technology and Mechatronics Automation (ICMTMA). doi: 10.1109/ICMTMA.2013.312
Malay Mail Online (2015). Police: Drivers losing control of vehicles main cause of fatal accidents in 2015. Retrieved from http://www.themalaymailonline.com/malaysia/article/police-drivers- losing-control-of-vehicles-main-cause-of-fatal-accidents-in
Motor Trend Staff (2015). 2015 Motor trend best driver’s car. Retrieved from http://www.motortrend.com/cars/mercedes-benz/amg-gt/2016/2015-motor-trend-best-drivers- car/
NHTSA (2001). Notice of proposed rulemaking. Washington, DC: National Highway Traffic Safety Administration, US Department of Transportation (DOT). Retrieved from https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&v ed=0ahUKEwi2ycrajovUAhUKn5QKHWXMCUYQFghEMAU&url=https%3A%2F%2Fwww .nhtsa.gov%2Fcars%2Frules%2Frulings%2FRollover%2F2001Standards%2FRolloverResistan ce.DOC&usg=AFQjCNGLD76heVQjTERx2z4LwEpS9TInPQ
Proton (2016). Proton SAGA owner’s manual. (pg. 126-133). Shah Alam: Proton Holdings Bhd.
Qian, K., Tan, G., Zhou, R., Mei, B., & Xia, W. (2017). Vehicle-GIS assistant driving system for real- time safety speed warning on mountain roads (SAE Technical Paper 2017-01-1400). Warrendale, PA: SAE International. doi: 10.4271/2017-01-1400
Rajamani, R. (2006). Lateral vehicle dynamics. Vehicle dynamics and control. (pp. 15-49). Boston, MA: Springer US.
Road Safety Department (2014). Road Safety Plan of Malaysia 2014-2020. Putrajaya: Road Safety Department, Ministry of Transport Malaysia. Retrieved from http://www.mot.gov.my/SiteCollectionDocuments/Darat/Road_Safety_Plan_2014- 2020_booklet-EN.pdf
Wang, Q., Yang, B., Tan, G., Xiong, S., & Zhou, X. (2017). Safe travelling speed of commercial vehicles on curves based on vehicle-road collaboration (SAE Technical Paper 2017-01-0080). doi: 10.4271/2017-01-0080
Zhou, S., Tan, G., Ji, K., Zhou, R., & Liu, H. (2017). Over-the-horizon safety speed warning system for heavy-duty vehicle in mountain areas (SAE Technical Paper 2017-01-0091). doi: 10.4271/2017- 01-0091