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Effect of the Power Steering System Driving Torque on Vehicle Fuel Economy in a Passenger Car  

Kim Namkyun (Renault Samsung Motors)
Han Changho (GM Daewo Auto & Technology)
Kim Wooseok (Commercial Vehicle Test Research Team, Hyundai Motor Co.,)
Lee Jonghwa (School of Mechanical Engineering, Ajou University)
Park Jinil (School of Mechanical Engineering, Ajou University)
Park Kyungseok (School of Mechanical Engineering, Kumoh National Institute of Technology)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.14, no.1, 2006 , pp. 60-67 More about this Journal
Abstract
To improve the vehicle fuel economy, various technologies have been studied. Meanwhile it deteriorates fuel economy that the increased driving torque for Power Steering System (PSS) due to weighted vehicle and widened tire for low speed driving and parking. So the larger driving torque for PSS is, the lower fuel economy is. Therefore, the study about the effect of the driving torque for PSS and the engine total friction must be preceded to improve the vehicle fuel economy. In this study, a PSS module separated from the vehicle is used to measure the driving torque for PSS with respect to the pressure of PSS. The result shows that the driving torque for PSS was in direct proportion to the pressure of PSS 3 (N-m) driving torque for PSS vs. 10 (bar) pressure of PSS, and 8 (N-m) vs. 40 (bar). In addition, the driving torque and pressure for PSS was measured according to the engine speed in the component test condition which was in the vehicle condition. Measuring the driving torque for PSP in the vehicle condition was established by using the VeFAS which was a fuel economy analyzer developed in our lab and installing PSS By-pass line. The effect of the driving torque for PSS on the vehicle fuel economy was analyzed with FTP-75 cold start mode.
Keywords
Power steering system; Engine total friction; Fuel economy; Driving torque; Vehicle condition;
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