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A Vehicle State Detection Method Based on Estimated Aligning Torque Using EPS
Technical Paper
2005-01-1265
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper proposes a vehicle state detection method for improving the stability of vehicles equipped with electric power steering (EPS) and electronic stability control (ESC) systems. ESC is an effective vehicle stability control system that operates within a vehicle's stability limitations. Generally ESC uses a vehicle state signal such as yaw rate. To enhance the ESC function so that it can alleviate understeer, a process that is capable of detecting understeer is required. This concept motivated us to develop a vehicle state detection algorithm based on estimated self-aligning torque using EPS. It is well known that maximum self-aligning torque occurs before maximum cornering force is reached. We have confirmed that the proposed algorithm can detect understeer earlier than conventional means based on vehicle yaw rate. We have also implemented this algorithm in an ESC electronic control unit (ECU) and conducted an actual vehicle test to confirm that a reduction in turning radius is realized compared with that using conventional ESC.
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Nakajima, K., Kurishige, M., Endo, M., and Kifuku, T., "A Vehicle State Detection Method Based on Estimated Aligning Torque Using EPS," SAE Technical Paper 2005-01-1265, 2005, https://doi.org/10.4271/2005-01-1265.Also In
References
- http://www.toyota.co.jp/Showroom/All_toyota_lineup/crownmajesta/index.html
- Post J. W. “Modeling and Testing of Automobile Power Steering Systems for the Evaluation of On-Center Handling” Clemson University 1995
- Kurishige M. et al. “A New EPS Control Strategy To Improve Steering Wheel Returnability” SAE Paper 2000-01-0815 2000
- Tanaka H. et al. “The Torque Controlled Active Steer For EPS” AVEC '04 Paper
- Toyota Crown Majesta Maintenance Manual