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Automotive suspension systems with limited frequency domain control and sampling control

Author: SunWeiChao
Tutor: GaoHuiJun
School: Harbin Institute of Technology
Course: Control Science and Engineering
Keywords: Automobile Suspension System Finite frequency domain controls H_ ∞ Control Dynamic output feedback Digital sampling control State feedback
CLC: TP273
Type: Master's thesis
Year: 2009
Downloads: 96
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And the overall performance of the car is closely related to automotive active suspension system has been a research hotspot in recent years. In this paper, automotive active suspension control system in the two hot issues - limited frequency domain control issues and the digital sampling control problem is studied, and the corresponding controller design method. In a limited frequency domain H ∞ control, unlike the existing vehicle suspension system H ∞ control method in the whole frequency domain under disturbance attenuation, this controller design method can be implemented in a limited frequency domain disturbance rejection, so vibrations in the body is sensitive frequency range is maximally attenuated. By using the generalized Kalman-Yakubovich-Popov lemma, from the disturbance to the control output H ∞ norm in the frequency domain of concern is minimized, thereby improving driving comfort. Compared with the full-frequency method, finite frequency domain method in a specific frequency region can be controlled more effectively, at the same time, the design of suspension necessary time domain constraints can also be guaranteed. State feedback control can be good for the system to achieve control, combined with the generalized KYP lemma, this paper gives a finite frequency domain state feedback controller design method for automotive suspension systems with limited frequency domain characteristics were H ∞ control . State feedback control based on all state variables are measurable as a precondition, which in practice is often not easy to achieve, in order to adapt to the actual situation, this paper does not fully measure the state of the case also raised the finite frequency domain dynamic output feedback controller design methods, and to borrow a quarter active suspension system model, respectively, to the state and output feedback loop feedback loop system in time domain and frequency domain simulation, simulation results demonstrate the effectiveness of the controller design . Digital sampling control problem is control of vehicle suspension system is another difficult problem, difficulty lies in its control system contains both continuous-time signals and discrete-time signal, the traditional control methods are often very limited. This time delay through the use of an input method, the sample suspension system into a continuous-time systems with time delays, which contains a non-mediated transformation of time-varying delay, finally, be transformed into a controller design with linear matrix inequality (LMI) constraints convex optimization problem is solved, in order to meet the parameters of vehicle changes, we further design a robust controller. Simulation results verify the effectiveness of the controller design.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
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