Commenced in January 2007
Paper Count: 30835
Friction Calculation and Simulation of Column Electric Power Steering System
Abstract:This study presents a procedure for friction calculation of column electric power steering (C-EPS) system which affects handling and comfort in driving. The friction losses estimation is obtained from experimental tests and mathematical calculation. Parts in C-EPS mainly involved in friction losses are bearings and worm gear. In the theoretical approach, the gear geometry and Hertz law were employed to measure the normal load and the sliding velocity and contact areas from the worm gears driving conditions. The viscous friction generated in the worm gear was obtained with a theoretical approach and the result was applied to model the friction in the steering system. Finally, by viscous friction coefficient and Coulomb friction coefficient, values of friction in worm gear were calculated. According to the Bearing Company and the characteristics of each bearing, the friction torques due to load and due to speed were calculated. A MATLAB Simulink model for calculating the friction in bearings and worm gear in C-EPS were done and the total friction value was estimated.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1339980Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1459
 Shi Guobiao, Zhao Songhui, Min Jun. Simulation Analysis for Electric Power Steering Control System Based on Permanent Magnetism Synchronization Motor, 2012.
 M.F. Rahman. Electric power assisted steering system for automobiles, 2003.
 Toyota Technical training. Electric power steering.
 Jelaska, Damir .T. Gears and Gear Drives.
 Adam Macheta and Sebastian Kania. Worm gear losses, EC Engineering, 2009.
 http://www.globalspec.com/learnmore/motion_controls/power_transmission/gears/worms_worm_gears by IEEE Global spec at 1/12/2015
 Stephan P. Radzevich. Dudley’s handbook of practical gear and manufacturing. 2nd edition.
 Seong Han Kim, Min Chul Shin. Efficiency prediction of worm gear with plastic worm wheel, 2011.
 Kohara Gear Industry Company, Practical Information for Gears.
 Min Chul Shin, Seong Han Kim, Gwang Hee Cho and Chong Nam Chu. Development of a steering-system model considering viscous friction and its verification, August 2013.
 Litvin FL and Fuentes A. Gear geometry and applied theory. 2nd edition. Cambridge: Cambridge University Press, 2004.
 Pande A. M., Kharde Y. R. Effect of Pressure Angle on Transmission Efficiency of Helical Gears, July 2013.
 United States Patent, Double Flank Worm Gear Mechanism, patent number: US6776064 B2, August 2004.
 Fuji film pre scale, Color Correlation Manual for Pressure Interpretation.
 http://www.plastotecnicaemiliana.it/index.php/prodotti/nylon-pa available at 1/12/2016.
 www.skf.com at 1/12/2016
 http://medias.ina.com/medias/en!hp.tg.cat/tg_hr*ST4_102160011 at 1/12/2016.
 SKF Bearing handbook for electric motors, Publication 140-430, Version 11/2005.