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Improvement of Steering Performance Using Steering Rack Force Control
Technical Paper
2019-01-1234
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Drivers continually require steering performance improvement, particularly in the area of feedback from the road. In this study, we develop a new electrically-assisted steering logic by 1) analyzing existing steering systems to determine key factors, 2) modeling an ideal steering system from which to obtain a desirable driver torque, 3) developing a rack force observer to faithfully represent road information and 4) building a feedback compensator to track the tuned torque. In general, the estimator uses the driver torque, assist torque and other steering system signals. However, the friction of the steering system is difficult to estimate accurately. At high speed, where steering feeling is very important, greater friction results in increased error. In order to solve this problem, we design two estimators generated from a vehicle model and a steering system model. The observer that uses two estimators can reflect various operating conditions by using the strengths of each method. Therefore, it reflects the driving situation more precisely. We evaluated real vehicle performance under various operating conditions to compare the actual rack force and the rack force of the estimator, verifying the accuracy. Simulation-based evaluation and vehicle test confirmed that the proposed logic improves the steering feedback performance, and the robustness to component dispersion.
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Kim, C., Son, D., Sabato, Z., and Lee, B., "Improvement of Steering Performance Using Steering Rack Force Control," SAE Technical Paper 2019-01-1234, 2019, https://doi.org/10.4271/2019-01-1234.Data Sets - Support Documents
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References
- Shimizu , Y. and Kawi , T. Development of Electric Power Steering SAE Technical Paper 910014 1991 10.4271/910014
- Kurishige , M. and Kifuku , T. A Control Strategy to Reduce Steering Torque for Stationary Vehicles Equipped with EPS SAE Technical Paper 1999-01-0403 1999 10.4271/1999-01-0403
- Koch , T. 2010
- Fankem , S. Model-Based Rack Force Estimation for Electric Power Steering IFAC 2014
- Cassar , S. , Michelis , A. Advantages of Torque Feedback Control / Command Strategy for EPS Application across Vehicle Platforms chassis. Tech plus, 4th International Munich Chassis Symposium 2013
- Karnopp , D.C. , Margolis , D.L. , and Rosenberg , R.C. System Dynamics: Modeling and Simulation of Mechatronic Systems New York Wiley 2012
- Margolis , D. The Controller Output Observer: Estimation of Vehicle Tire Cornering and Normal Forces ASME 2008
- Bakker et al. Tyre Modeling for Use in Vehicle Dynamics Studies SAE Technical Paper 870421 1987 10.4271/870421