Advances in Automobile Engineering
Open Access
ISSN: 2167-7670
+44 1300 500008
ISSN: 2167-7670
+44 1300 500008
S B Phadke
College of Engineering Pune, India
Posters & Accepted Abstracts: Adv Automob Eng
Good passenger comfort, ride comfort and ride handling are sought after goals in modern cars. Passive suspension systems can offer only a limited performance when meeting these goals. Well established and emerging feedback control strategies like the sliding mode control, adaptive control, optimal control to name just a few, have found the problem of active suspension to be an attractive application. Active suspension systems can outperform passive and semi active systems but bring new problems with them with regard to ride and suspension safety. From a control point of view, suspension systems are uncertain systems affected by an unknown disturbance in the form of an unknown road profile. In the literature, road preview using special sensors or using lead vehicles in a convoy has been proposed by many researchers. Estimating the effect of unknown road profile and uncertainties without using special sensors is made possible by two new methods called Inertial Delay Control (IDC) and Disturbance Observer (DO) is a new paradigm that gives a remarkable performance. The estimation is made in real time with the help of measurement of sprung mass position and velocity. The methods of IDC and DO are further developed to do away with velocity measurement which is a costly and noisy affair, by developing the estimate using only the sprung mass position. The method of estimation is generalized to improve the accuracy of estimation. A remarkable feature of the method is to get a performance that is better than sky-hook without having to use a sky-hook damper. This talk develops the idea further to explore how the method can be employed to give ride comfort without losing on handling requirements. The new methods are further developed to handle the conflict between improving ride comfort and keeping the suspension stroke within the rattle space constraints. Comparisons are made with other prevailing methods like the Linear Quadratic Regulator. Novel nonlinear functions combined with the methods of IDC or DO enable making the compromise just when needed. The talk concludes by discussing future directions.
Email: sbp.instru@coep.ac.in