Application of Practical Observer to Semi-Active Suspensions

[+] Author and Article Information
H. Nakai

Toyota Central R&D Labs., Inc., Nagakute, Aichi, 480-1192, Japan

S. Oosaku, Y. Motozono

Toyota Motor Corporation, Toyota, Aichi, 471-0826, Japan

J. Dyn. Sys., Meas., Control 122(2), 284-289 (May 27, 1998) (6 pages) doi:10.1115/1.482454 History: Received May 27, 1998
Copyright © 2000 by ASME
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Karnopp,  D., 1990, “Design Principles for Vibration Control Systems Using Semi-Active Dampers,” ASME J. Dyn. Syst., Meas., Control, 112, pp. 448–455.
Doi, S., Yasuda, E., and Hayashi, Y., 1988, “An Experimental Study of Optimal Vibration Adjustment Using Adaptive Control Methods,” IMechE Conf. on Advanced Suspension, London, pp. 119–132.
Henry, R. R., and Zeid, A. A., 1992, “A Nonlinear, Sub-optimal, Observer-based Control for Semi-Active Suspension,” Proceeding Transportation Systems DSC ASME, Vol. 44.
Karnopp,  D., Crosby,  M. J., and Harwood,  R. A., 1974, “Vibration Control Using Semi-active Force Generators,” ASME J. Eng. Ind., 86, pp. 619–626.
Yi,  K., and Hedrick,  K., 1993, “Dynamic Tire Control by Semi-Active Suspensions,” ASME J. Dyn. Syst., Meas., Control, 115, pp. 465–474.
Suzuki,  M., 1981, “Composite Controls for Singularly Perturbed Systems,” IEEE Trans. Autom. Control, 26, No. 2, pp. 505–507.


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Quarter car semi-active suspension model
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Shock absorber characteristic diagram
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Gain scheduling observer block diagram
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Comparison of the accuracy between GS, GF and the linear observer
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Effect of feedback gain on estimated errors
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Schematic diagram of experimental system
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Comparison of suspension stroke velocity (Ts=10 ms)
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Comparison of suspension stroke velocity
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Accuracy of the estimated signal on the frequency domain
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Comparison of suspension stroke velocity (Ts=10 ms)



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